9133 lines
248 KiB
C
9133 lines
248 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* A prototype Bourne shell grammar parser.
|
|
* Intended to follow the original Thompson and Ritchie
|
|
* "small and simple is beautiful" philosophy, which
|
|
* incidentally is a good match to today's BusyBox.
|
|
*
|
|
* Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
|
|
* Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*
|
|
* Credits:
|
|
* The parser routines proper are all original material, first
|
|
* written Dec 2000 and Jan 2001 by Larry Doolittle. The
|
|
* execution engine, the builtins, and much of the underlying
|
|
* support has been adapted from busybox-0.49pre's lash, which is
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
* written by Erik Andersen <andersen@codepoet.org>. That, in turn,
|
|
* is based in part on ladsh.c, by Michael K. Johnson and Erik W.
|
|
* Troan, which they placed in the public domain. I don't know
|
|
* how much of the Johnson/Troan code has survived the repeated
|
|
* rewrites.
|
|
*
|
|
* Other credits:
|
|
* o_addchr derived from similar w_addchar function in glibc-2.2.
|
|
* parse_redirect, redirect_opt_num, and big chunks of main
|
|
* and many builtins derived from contributions by Erik Andersen.
|
|
* Miscellaneous bugfixes from Matt Kraai.
|
|
*
|
|
* There are two big (and related) architecture differences between
|
|
* this parser and the lash parser. One is that this version is
|
|
* actually designed from the ground up to understand nearly all
|
|
* of the Bourne grammar. The second, consequential change is that
|
|
* the parser and input reader have been turned inside out. Now,
|
|
* the parser is in control, and asks for input as needed. The old
|
|
* way had the input reader in control, and it asked for parsing to
|
|
* take place as needed. The new way makes it much easier to properly
|
|
* handle the recursion implicit in the various substitutions, especially
|
|
* across continuation lines.
|
|
*
|
|
* TODOs:
|
|
* grep for "TODO" and fix (some of them are easy)
|
|
* special variables (done: PWD, PPID, RANDOM)
|
|
* tilde expansion
|
|
* aliases
|
|
* follow IFS rules more precisely, including update semantics
|
|
* builtins mandated by standards we don't support:
|
|
* [un]alias, command, fc, getopts, newgrp, readonly, times
|
|
* make complex ${var%...} constructs support optional
|
|
* make here documents optional
|
|
*
|
|
* Bash compat TODO:
|
|
* redirection of stdout+stderr: &> and >&
|
|
* reserved words: function select
|
|
* advanced test: [[ ]]
|
|
* process substitution: <(list) and >(list)
|
|
* =~: regex operator
|
|
* let EXPR [EXPR...]
|
|
* Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION)
|
|
* If the last arg evaluates to 0, let returns 1; 0 otherwise.
|
|
* NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used)
|
|
* ((EXPR))
|
|
* The EXPR is evaluated according to ARITHMETIC EVALUATION.
|
|
* This is exactly equivalent to let "EXPR".
|
|
* $[EXPR]: synonym for $((EXPR))
|
|
*
|
|
* Won't do:
|
|
* In bash, export builtin is special, its arguments are assignments
|
|
* and therefore expansion of them should be "one-word" expansion:
|
|
* $ export i=`echo 'a b'` # export has one arg: "i=a b"
|
|
* compare with:
|
|
* $ ls i=`echo 'a b'` # ls has two args: "i=a" and "b"
|
|
* ls: cannot access i=a: No such file or directory
|
|
* ls: cannot access b: No such file or directory
|
|
* Note1: same applies to local builtin.
|
|
* Note2: bash 3.2.33(1) does this only if export word itself
|
|
* is not quoted:
|
|
* $ export i=`echo 'aaa bbb'`; echo "$i"
|
|
* aaa bbb
|
|
* $ "export" i=`echo 'aaa bbb'`; echo "$i"
|
|
* aaa
|
|
*/
|
|
#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
|
|
|| defined(__APPLE__) \
|
|
)
|
|
# include <malloc.h> /* for malloc_trim */
|
|
#endif
|
|
#include <glob.h>
|
|
/* #include <dmalloc.h> */
|
|
#if ENABLE_HUSH_CASE
|
|
# include <fnmatch.h>
|
|
#endif
|
|
|
|
#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
|
|
#include "unicode.h"
|
|
#include "shell_common.h"
|
|
#include "math.h"
|
|
#include "match.h"
|
|
#if ENABLE_HUSH_RANDOM_SUPPORT
|
|
# include "random.h"
|
|
#else
|
|
# define CLEAR_RANDOM_T(rnd) ((void)0)
|
|
#endif
|
|
#ifndef PIPE_BUF
|
|
# define PIPE_BUF 4096 /* amount of buffering in a pipe */
|
|
#endif
|
|
|
|
/* Not every libc has sighandler_t. Fix it */
|
|
typedef void (*hush_sighandler_t)(int);
|
|
#define sighandler_t hush_sighandler_t
|
|
|
|
//config:config HUSH
|
|
//config: bool "hush"
|
|
//config: default y
|
|
//config: help
|
|
//config: hush is a small shell (25k). It handles the normal flow control
|
|
//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
|
|
//config: case/esac. Redirections, here documents, $((arithmetic))
|
|
//config: and functions are supported.
|
|
//config:
|
|
//config: It will compile and work on no-mmu systems.
|
|
//config:
|
|
//config: It does not handle select, aliases, tilde expansion,
|
|
//config: &>file and >&file redirection of stdout+stderr.
|
|
//config:
|
|
//config:config HUSH_BASH_COMPAT
|
|
//config: bool "bash-compatible extensions"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable bash-compatible extensions.
|
|
//config:
|
|
//config:config HUSH_BRACE_EXPANSION
|
|
//config: bool "Brace expansion"
|
|
//config: default y
|
|
//config: depends on HUSH_BASH_COMPAT
|
|
//config: help
|
|
//config: Enable {abc,def} extension.
|
|
//config:
|
|
//config:config HUSH_HELP
|
|
//config: bool "help builtin"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable help builtin in hush. Code size + ~1 kbyte.
|
|
//config:
|
|
//config:config HUSH_INTERACTIVE
|
|
//config: bool "Interactive mode"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable interactive mode (prompt and command editing).
|
|
//config: Without this, hush simply reads and executes commands
|
|
//config: from stdin just like a shell script from a file.
|
|
//config: No prompt, no PS1/PS2 magic shell variables.
|
|
//config:
|
|
//config:config HUSH_SAVEHISTORY
|
|
//config: bool "Save command history to .hush_history"
|
|
//config: default y
|
|
//config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
|
|
//config: help
|
|
//config: Enable history saving in hush.
|
|
//config:
|
|
//config:config HUSH_JOB
|
|
//config: bool "Job control"
|
|
//config: default y
|
|
//config: depends on HUSH_INTERACTIVE
|
|
//config: help
|
|
//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
|
|
//config: command (not entire shell), fg/bg builtins work. Without this option,
|
|
//config: "cmd &" still works by simply spawning a process and immediately
|
|
//config: prompting for next command (or executing next command in a script),
|
|
//config: but no separate process group is formed.
|
|
//config:
|
|
//config:config HUSH_TICK
|
|
//config: bool "Process substitution"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable process substitution `command` and $(command) in hush.
|
|
//config:
|
|
//config:config HUSH_IF
|
|
//config: bool "Support if/then/elif/else/fi"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable if/then/elif/else/fi in hush.
|
|
//config:
|
|
//config:config HUSH_LOOPS
|
|
//config: bool "Support for, while and until loops"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable for, while and until loops in hush.
|
|
//config:
|
|
//config:config HUSH_CASE
|
|
//config: bool "Support case ... esac statement"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable case ... esac statement in hush. +400 bytes.
|
|
//config:
|
|
//config:config HUSH_FUNCTIONS
|
|
//config: bool "Support funcname() { commands; } syntax"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable support for shell functions in hush. +800 bytes.
|
|
//config:
|
|
//config:config HUSH_LOCAL
|
|
//config: bool "Support local builtin"
|
|
//config: default y
|
|
//config: depends on HUSH_FUNCTIONS
|
|
//config: help
|
|
//config: Enable support for local variables in functions.
|
|
//config:
|
|
//config:config HUSH_RANDOM_SUPPORT
|
|
//config: bool "Pseudorandom generator and $RANDOM variable"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
|
|
//config: Each read of "$RANDOM" will generate a new pseudorandom value.
|
|
//config:
|
|
//config:config HUSH_EXPORT_N
|
|
//config: bool "Support 'export -n' option"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: export -n unexports variables. It is a bash extension.
|
|
//config:
|
|
//config:config HUSH_MODE_X
|
|
//config: bool "Support 'hush -x' option and 'set -x' command"
|
|
//config: default y
|
|
//config: depends on HUSH
|
|
//config: help
|
|
//config: This instructs hush to print commands before execution.
|
|
//config: Adds ~300 bytes.
|
|
//config:
|
|
//config:config MSH
|
|
//config: bool "msh (deprecated: aliased to hush)"
|
|
//config: default n
|
|
//config: select HUSH
|
|
//config: help
|
|
//config: msh is deprecated and will be removed, please migrate to hush.
|
|
//config:
|
|
|
|
//applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
|
|
//applet:IF_MSH(APPLET(msh, BB_DIR_BIN, BB_SUID_DROP))
|
|
//applet:IF_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, sh))
|
|
//applet:IF_FEATURE_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, bash))
|
|
|
|
//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
|
|
//kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
|
|
|
|
/* -i (interactive) and -s (read stdin) are also accepted,
|
|
* but currently do nothing, therefore aren't shown in help.
|
|
* NOMMU-specific options are not meant to be used by users,
|
|
* therefore we don't show them either.
|
|
*/
|
|
//usage:#define hush_trivial_usage
|
|
//usage: "[-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
|
|
//usage:#define hush_full_usage "\n\n"
|
|
//usage: "Unix shell interpreter"
|
|
|
|
//usage:#define msh_trivial_usage hush_trivial_usage
|
|
//usage:#define msh_full_usage hush_full_usage
|
|
|
|
//usage:#if ENABLE_FEATURE_SH_IS_HUSH
|
|
//usage:# define sh_trivial_usage hush_trivial_usage
|
|
//usage:# define sh_full_usage hush_full_usage
|
|
//usage:#endif
|
|
//usage:#if ENABLE_FEATURE_BASH_IS_HUSH
|
|
//usage:# define bash_trivial_usage hush_trivial_usage
|
|
//usage:# define bash_full_usage hush_full_usage
|
|
//usage:#endif
|
|
|
|
|
|
/* Build knobs */
|
|
#define LEAK_HUNTING 0
|
|
#define BUILD_AS_NOMMU 0
|
|
/* Enable/disable sanity checks. Ok to enable in production,
|
|
* only adds a bit of bloat. Set to >1 to get non-production level verbosity.
|
|
* Keeping 1 for now even in released versions.
|
|
*/
|
|
#define HUSH_DEBUG 1
|
|
/* Slightly bigger (+200 bytes), but faster hush.
|
|
* So far it only enables a trick with counting SIGCHLDs and forks,
|
|
* which allows us to do fewer waitpid's.
|
|
* (we can detect a case where neither forks were done nor SIGCHLDs happened
|
|
* and therefore waitpid will return the same result as last time)
|
|
*/
|
|
#define ENABLE_HUSH_FAST 0
|
|
/* TODO: implement simplified code for users which do not need ${var%...} ops
|
|
* So far ${var%...} ops are always enabled:
|
|
*/
|
|
#define ENABLE_HUSH_DOLLAR_OPS 1
|
|
|
|
|
|
#if BUILD_AS_NOMMU
|
|
# undef BB_MMU
|
|
# undef USE_FOR_NOMMU
|
|
# undef USE_FOR_MMU
|
|
# define BB_MMU 0
|
|
# define USE_FOR_NOMMU(...) __VA_ARGS__
|
|
# define USE_FOR_MMU(...)
|
|
#endif
|
|
|
|
#include "NUM_APPLETS.h"
|
|
#if NUM_APPLETS == 1
|
|
/* STANDALONE does not make sense, and won't compile */
|
|
# undef CONFIG_FEATURE_SH_STANDALONE
|
|
# undef ENABLE_FEATURE_SH_STANDALONE
|
|
# undef IF_FEATURE_SH_STANDALONE
|
|
# undef IF_NOT_FEATURE_SH_STANDALONE
|
|
# define ENABLE_FEATURE_SH_STANDALONE 0
|
|
# define IF_FEATURE_SH_STANDALONE(...)
|
|
# define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
|
|
#endif
|
|
|
|
#if !ENABLE_HUSH_INTERACTIVE
|
|
# undef ENABLE_FEATURE_EDITING
|
|
# define ENABLE_FEATURE_EDITING 0
|
|
# undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
|
# define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
|
|
#endif
|
|
|
|
/* Do we support ANY keywords? */
|
|
#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
# define HAS_KEYWORDS 1
|
|
# define IF_HAS_KEYWORDS(...) __VA_ARGS__
|
|
# define IF_HAS_NO_KEYWORDS(...)
|
|
#else
|
|
# define HAS_KEYWORDS 0
|
|
# define IF_HAS_KEYWORDS(...)
|
|
# define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
|
|
#endif
|
|
|
|
/* If you comment out one of these below, it will be #defined later
|
|
* to perform debug printfs to stderr: */
|
|
#define debug_printf(...) do {} while (0)
|
|
/* Finer-grained debug switches */
|
|
#define debug_printf_parse(...) do {} while (0)
|
|
#define debug_print_tree(a, b) do {} while (0)
|
|
#define debug_printf_exec(...) do {} while (0)
|
|
#define debug_printf_env(...) do {} while (0)
|
|
#define debug_printf_jobs(...) do {} while (0)
|
|
#define debug_printf_expand(...) do {} while (0)
|
|
#define debug_printf_varexp(...) do {} while (0)
|
|
#define debug_printf_glob(...) do {} while (0)
|
|
#define debug_printf_list(...) do {} while (0)
|
|
#define debug_printf_subst(...) do {} while (0)
|
|
#define debug_printf_clean(...) do {} while (0)
|
|
|
|
#define ERR_PTR ((void*)(long)1)
|
|
|
|
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
|
|
|
|
#define _SPECIAL_VARS_STR "_*@$!?#"
|
|
#define SPECIAL_VARS_STR ("_*@$!?#" + 1)
|
|
#define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3)
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
/* Support / and // replace ops */
|
|
/* Note that // is stored as \ in "encoded" string representation */
|
|
# define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?"
|
|
# define VAR_SUBST_OPS ("\\/%#:-=+?" + 1)
|
|
# define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5)
|
|
#else
|
|
# define VAR_ENCODED_SUBST_OPS "%#:-=+?"
|
|
# define VAR_SUBST_OPS "%#:-=+?"
|
|
# define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3)
|
|
#endif
|
|
|
|
#define SPECIAL_VAR_SYMBOL 3
|
|
|
|
struct variable;
|
|
|
|
static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
|
|
|
|
/* This supports saving pointers malloced in vfork child,
|
|
* to be freed in the parent.
|
|
*/
|
|
#if !BB_MMU
|
|
typedef struct nommu_save_t {
|
|
char **new_env;
|
|
struct variable *old_vars;
|
|
char **argv;
|
|
char **argv_from_re_execing;
|
|
} nommu_save_t;
|
|
#endif
|
|
|
|
enum {
|
|
RES_NONE = 0,
|
|
#if ENABLE_HUSH_IF
|
|
RES_IF ,
|
|
RES_THEN ,
|
|
RES_ELIF ,
|
|
RES_ELSE ,
|
|
RES_FI ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
RES_FOR ,
|
|
RES_WHILE ,
|
|
RES_UNTIL ,
|
|
RES_DO ,
|
|
RES_DONE ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
RES_IN ,
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
RES_CASE ,
|
|
/* three pseudo-keywords support contrived "case" syntax: */
|
|
RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */
|
|
RES_MATCH , /* "word)" */
|
|
RES_CASE_BODY, /* "this command is inside CASE" */
|
|
RES_ESAC ,
|
|
#endif
|
|
RES_XXXX ,
|
|
RES_SNTX
|
|
};
|
|
|
|
typedef struct o_string {
|
|
char *data;
|
|
int length; /* position where data is appended */
|
|
int maxlen;
|
|
int o_expflags;
|
|
/* At least some part of the string was inside '' or "",
|
|
* possibly empty one: word"", wo''rd etc. */
|
|
smallint has_quoted_part;
|
|
smallint has_empty_slot;
|
|
smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
|
|
} o_string;
|
|
enum {
|
|
EXP_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */
|
|
EXP_FLAG_GLOB = 0x2,
|
|
/* Protect newly added chars against globbing
|
|
* by prepending \ to *, ?, [, \ */
|
|
EXP_FLAG_ESC_GLOB_CHARS = 0x1,
|
|
};
|
|
enum {
|
|
MAYBE_ASSIGNMENT = 0,
|
|
DEFINITELY_ASSIGNMENT = 1,
|
|
NOT_ASSIGNMENT = 2,
|
|
/* Not an assigment, but next word may be: "if v=xyz cmd;" */
|
|
WORD_IS_KEYWORD = 3,
|
|
};
|
|
/* Used for initialization: o_string foo = NULL_O_STRING; */
|
|
#define NULL_O_STRING { NULL }
|
|
|
|
#ifndef debug_printf_parse
|
|
static const char *const assignment_flag[] = {
|
|
"MAYBE_ASSIGNMENT",
|
|
"DEFINITELY_ASSIGNMENT",
|
|
"NOT_ASSIGNMENT",
|
|
"WORD_IS_KEYWORD",
|
|
};
|
|
#endif
|
|
|
|
typedef struct in_str {
|
|
const char *p;
|
|
/* eof_flag=1: last char in ->p is really an EOF */
|
|
char eof_flag; /* meaningless if ->p == NULL */
|
|
char peek_buf[2];
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
smallint promptmode; /* 0: PS1, 1: PS2 */
|
|
#endif
|
|
int last_char;
|
|
FILE *file;
|
|
int (*get) (struct in_str *) FAST_FUNC;
|
|
int (*peek) (struct in_str *) FAST_FUNC;
|
|
} in_str;
|
|
#define i_getch(input) ((input)->get(input))
|
|
#define i_peek(input) ((input)->peek(input))
|
|
|
|
/* The descrip member of this structure is only used to make
|
|
* debugging output pretty */
|
|
static const struct {
|
|
int mode;
|
|
signed char default_fd;
|
|
char descrip[3];
|
|
} redir_table[] = {
|
|
{ O_RDONLY, 0, "<" },
|
|
{ O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
|
|
{ O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
|
|
{ O_CREAT|O_RDWR, 1, "<>" },
|
|
{ O_RDONLY, 0, "<<" },
|
|
/* Should not be needed. Bogus default_fd helps in debugging */
|
|
/* { O_RDONLY, 77, "<<" }, */
|
|
};
|
|
|
|
struct redir_struct {
|
|
struct redir_struct *next;
|
|
char *rd_filename; /* filename */
|
|
int rd_fd; /* fd to redirect */
|
|
/* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
|
|
int rd_dup;
|
|
smallint rd_type; /* (enum redir_type) */
|
|
/* note: for heredocs, rd_filename contains heredoc delimiter,
|
|
* and subsequently heredoc itself; and rd_dup is a bitmask:
|
|
* bit 0: do we need to trim leading tabs?
|
|
* bit 1: is heredoc quoted (<<'delim' syntax) ?
|
|
*/
|
|
};
|
|
typedef enum redir_type {
|
|
REDIRECT_INPUT = 0,
|
|
REDIRECT_OVERWRITE = 1,
|
|
REDIRECT_APPEND = 2,
|
|
REDIRECT_IO = 3,
|
|
REDIRECT_HEREDOC = 4,
|
|
REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */
|
|
|
|
REDIRFD_CLOSE = -3,
|
|
REDIRFD_SYNTAX_ERR = -2,
|
|
REDIRFD_TO_FILE = -1,
|
|
/* otherwise, rd_fd is redirected to rd_dup */
|
|
|
|
HEREDOC_SKIPTABS = 1,
|
|
HEREDOC_QUOTED = 2,
|
|
} redir_type;
|
|
|
|
|
|
struct command {
|
|
pid_t pid; /* 0 if exited */
|
|
int assignment_cnt; /* how many argv[i] are assignments? */
|
|
smallint is_stopped; /* is the command currently running? */
|
|
smallint cmd_type; /* CMD_xxx */
|
|
#define CMD_NORMAL 0
|
|
#define CMD_SUBSHELL 1
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
/* used for "[[ EXPR ]]" */
|
|
# define CMD_SINGLEWORD_NOGLOB 2
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
# define CMD_FUNCDEF 3
|
|
#endif
|
|
|
|
smalluint cmd_exitcode;
|
|
/* if non-NULL, this "command" is { list }, ( list ), or a compound statement */
|
|
struct pipe *group;
|
|
#if !BB_MMU
|
|
char *group_as_string;
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function *child_func;
|
|
/* This field is used to prevent a bug here:
|
|
* while...do f1() {a;}; f1; f1() {b;}; f1; done
|
|
* When we execute "f1() {a;}" cmd, we create new function and clear
|
|
* cmd->group, cmd->group_as_string, cmd->argv[0].
|
|
* When we execute "f1() {b;}", we notice that f1 exists,
|
|
* and that its "parent cmd" struct is still "alive",
|
|
* we put those fields back into cmd->xxx
|
|
* (struct function has ->parent_cmd ptr to facilitate that).
|
|
* When we loop back, we can execute "f1() {a;}" again and set f1 correctly.
|
|
* Without this trick, loop would execute a;b;b;b;...
|
|
* instead of correct sequence a;b;a;b;...
|
|
* When command is freed, it severs the link
|
|
* (sets ->child_func->parent_cmd to NULL).
|
|
*/
|
|
#endif
|
|
char **argv; /* command name and arguments */
|
|
/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
|
|
* and on execution these are substituted with their values.
|
|
* Substitution can make _several_ words out of one argv[n]!
|
|
* Example: argv[0]=='.^C*^C.' here: echo .$*.
|
|
* References of the form ^C`cmd arg^C are `cmd arg` substitutions.
|
|
*/
|
|
struct redir_struct *redirects; /* I/O redirections */
|
|
};
|
|
/* Is there anything in this command at all? */
|
|
#define IS_NULL_CMD(cmd) \
|
|
(!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
|
|
|
|
struct pipe {
|
|
struct pipe *next;
|
|
int num_cmds; /* total number of commands in pipe */
|
|
int alive_cmds; /* number of commands running (not exited) */
|
|
int stopped_cmds; /* number of commands alive, but stopped */
|
|
#if ENABLE_HUSH_JOB
|
|
int jobid; /* job number */
|
|
pid_t pgrp; /* process group ID for the job */
|
|
char *cmdtext; /* name of job */
|
|
#endif
|
|
struct command *cmds; /* array of commands in pipe */
|
|
smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
|
|
IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
|
|
IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
|
|
};
|
|
typedef enum pipe_style {
|
|
PIPE_SEQ = 1,
|
|
PIPE_AND = 2,
|
|
PIPE_OR = 3,
|
|
PIPE_BG = 4,
|
|
} pipe_style;
|
|
/* Is there anything in this pipe at all? */
|
|
#define IS_NULL_PIPE(pi) \
|
|
((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
|
|
|
|
/* This holds pointers to the various results of parsing */
|
|
struct parse_context {
|
|
/* linked list of pipes */
|
|
struct pipe *list_head;
|
|
/* last pipe (being constructed right now) */
|
|
struct pipe *pipe;
|
|
/* last command in pipe (being constructed right now) */
|
|
struct command *command;
|
|
/* last redirect in command->redirects list */
|
|
struct redir_struct *pending_redirect;
|
|
#if !BB_MMU
|
|
o_string as_string;
|
|
#endif
|
|
#if HAS_KEYWORDS
|
|
smallint ctx_res_w;
|
|
smallint ctx_inverted; /* "! cmd | cmd" */
|
|
#if ENABLE_HUSH_CASE
|
|
smallint ctx_dsemicolon; /* ";;" seen */
|
|
#endif
|
|
/* bitmask of FLAG_xxx, for figuring out valid reserved words */
|
|
int old_flag;
|
|
/* group we are enclosed in:
|
|
* example: "if pipe1; pipe2; then pipe3; fi"
|
|
* when we see "if" or "then", we malloc and copy current context,
|
|
* and make ->stack point to it. then we parse pipeN.
|
|
* when closing "then" / fi" / whatever is found,
|
|
* we move list_head into ->stack->command->group,
|
|
* copy ->stack into current context, and delete ->stack.
|
|
* (parsing of { list } and ( list ) doesn't use this method)
|
|
*/
|
|
struct parse_context *stack;
|
|
#endif
|
|
};
|
|
|
|
/* On program start, environ points to initial environment.
|
|
* putenv adds new pointers into it, unsetenv removes them.
|
|
* Neither of these (de)allocates the strings.
|
|
* setenv allocates new strings in malloc space and does putenv,
|
|
* and thus setenv is unusable (leaky) for shell's purposes */
|
|
#define setenv(...) setenv_is_leaky_dont_use()
|
|
struct variable {
|
|
struct variable *next;
|
|
char *varstr; /* points to "name=" portion */
|
|
#if ENABLE_HUSH_LOCAL
|
|
unsigned func_nest_level;
|
|
#endif
|
|
int max_len; /* if > 0, name is part of initial env; else name is malloced */
|
|
smallint flg_export; /* putenv should be done on this var */
|
|
smallint flg_read_only;
|
|
};
|
|
|
|
enum {
|
|
BC_BREAK = 1,
|
|
BC_CONTINUE = 2,
|
|
};
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function {
|
|
struct function *next;
|
|
char *name;
|
|
struct command *parent_cmd;
|
|
struct pipe *body;
|
|
# if !BB_MMU
|
|
char *body_as_string;
|
|
# endif
|
|
};
|
|
#endif
|
|
|
|
|
|
/* set -/+o OPT support. (TODO: make it optional)
|
|
* bash supports the following opts:
|
|
* allexport off
|
|
* braceexpand on
|
|
* emacs on
|
|
* errexit off
|
|
* errtrace off
|
|
* functrace off
|
|
* hashall on
|
|
* histexpand off
|
|
* history on
|
|
* ignoreeof off
|
|
* interactive-comments on
|
|
* keyword off
|
|
* monitor on
|
|
* noclobber off
|
|
* noexec off
|
|
* noglob off
|
|
* nolog off
|
|
* notify off
|
|
* nounset off
|
|
* onecmd off
|
|
* physical off
|
|
* pipefail off
|
|
* posix off
|
|
* privileged off
|
|
* verbose off
|
|
* vi off
|
|
* xtrace off
|
|
*/
|
|
static const char o_opt_strings[] ALIGN1 =
|
|
"pipefail\0"
|
|
"noexec\0"
|
|
#if ENABLE_HUSH_MODE_X
|
|
"xtrace\0"
|
|
#endif
|
|
;
|
|
enum {
|
|
OPT_O_PIPEFAIL,
|
|
OPT_O_NOEXEC,
|
|
#if ENABLE_HUSH_MODE_X
|
|
OPT_O_XTRACE,
|
|
#endif
|
|
NUM_OPT_O
|
|
};
|
|
|
|
|
|
/* "Globals" within this file */
|
|
/* Sorted roughly by size (smaller offsets == smaller code) */
|
|
struct globals {
|
|
/* interactive_fd != 0 means we are an interactive shell.
|
|
* If we are, then saved_tty_pgrp can also be != 0, meaning
|
|
* that controlling tty is available. With saved_tty_pgrp == 0,
|
|
* job control still works, but terminal signals
|
|
* (^C, ^Z, ^Y, ^\) won't work at all, and background
|
|
* process groups can only be created with "cmd &".
|
|
* With saved_tty_pgrp != 0, hush will use tcsetpgrp()
|
|
* to give tty to the foreground process group,
|
|
* and will take it back when the group is stopped (^Z)
|
|
* or killed (^C).
|
|
*/
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
/* 'interactive_fd' is a fd# open to ctty, if we have one
|
|
* _AND_ if we decided to act interactively */
|
|
int interactive_fd;
|
|
const char *PS1;
|
|
const char *PS2;
|
|
# define G_interactive_fd (G.interactive_fd)
|
|
#else
|
|
# define G_interactive_fd 0
|
|
#endif
|
|
#if ENABLE_FEATURE_EDITING
|
|
line_input_t *line_input_state;
|
|
#endif
|
|
pid_t root_pid;
|
|
pid_t root_ppid;
|
|
pid_t last_bg_pid;
|
|
#if ENABLE_HUSH_RANDOM_SUPPORT
|
|
random_t random_gen;
|
|
#endif
|
|
#if ENABLE_HUSH_JOB
|
|
int run_list_level;
|
|
int last_jobid;
|
|
pid_t saved_tty_pgrp;
|
|
struct pipe *job_list;
|
|
# define G_saved_tty_pgrp (G.saved_tty_pgrp)
|
|
#else
|
|
# define G_saved_tty_pgrp 0
|
|
#endif
|
|
char o_opt[NUM_OPT_O];
|
|
#if ENABLE_HUSH_MODE_X
|
|
# define G_x_mode (G.o_opt[OPT_O_XTRACE])
|
|
#else
|
|
# define G_x_mode 0
|
|
#endif
|
|
smallint flag_SIGINT;
|
|
#if ENABLE_HUSH_LOOPS
|
|
smallint flag_break_continue;
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
/* 0: outside of a function (or sourced file)
|
|
* -1: inside of a function, ok to use return builtin
|
|
* 1: return is invoked, skip all till end of func
|
|
*/
|
|
smallint flag_return_in_progress;
|
|
#endif
|
|
smallint exiting; /* used to prevent EXIT trap recursion */
|
|
/* These four support $?, $#, and $1 */
|
|
smalluint last_exitcode;
|
|
/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
|
|
smalluint global_args_malloced;
|
|
/* how many non-NULL argv's we have. NB: $# + 1 */
|
|
int global_argc;
|
|
char **global_argv;
|
|
#if !BB_MMU
|
|
char *argv0_for_re_execing;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
unsigned depth_break_continue;
|
|
unsigned depth_of_loop;
|
|
#endif
|
|
const char *ifs;
|
|
const char *cwd;
|
|
struct variable *top_var;
|
|
char **expanded_assignments;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function *top_func;
|
|
# if ENABLE_HUSH_LOCAL
|
|
struct variable **shadowed_vars_pp;
|
|
unsigned func_nest_level;
|
|
# endif
|
|
#endif
|
|
/* Signal and trap handling */
|
|
#if ENABLE_HUSH_FAST
|
|
unsigned count_SIGCHLD;
|
|
unsigned handled_SIGCHLD;
|
|
smallint we_have_children;
|
|
#endif
|
|
/* Which signals have non-DFL handler (even with no traps set)?
|
|
* Set at the start to:
|
|
* (SIGQUIT + maybe SPECIAL_INTERACTIVE_SIGS + maybe SPECIAL_JOBSTOP_SIGS)
|
|
* SPECIAL_INTERACTIVE_SIGS are cleared after fork.
|
|
* The rest is cleared right before execv syscalls.
|
|
* Other than these two times, never modified.
|
|
*/
|
|
unsigned special_sig_mask;
|
|
#if ENABLE_HUSH_JOB
|
|
unsigned fatal_sig_mask;
|
|
# define G_fatal_sig_mask G.fatal_sig_mask
|
|
#else
|
|
# define G_fatal_sig_mask 0
|
|
#endif
|
|
char **traps; /* char *traps[NSIG] */
|
|
sigset_t pending_set;
|
|
#if HUSH_DEBUG
|
|
unsigned long memleak_value;
|
|
int debug_indent;
|
|
#endif
|
|
struct sigaction sa;
|
|
char user_input_buf[ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 2];
|
|
};
|
|
#define G (*ptr_to_globals)
|
|
/* Not #defining name to G.name - this quickly gets unwieldy
|
|
* (too many defines). Also, I actually prefer to see when a variable
|
|
* is global, thus "G." prefix is a useful hint */
|
|
#define INIT_G() do { \
|
|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
|
/* memset(&G.sa, 0, sizeof(G.sa)); */ \
|
|
sigfillset(&G.sa.sa_mask); \
|
|
G.sa.sa_flags = SA_RESTART; \
|
|
} while (0)
|
|
|
|
|
|
/* Function prototypes for builtins */
|
|
static int builtin_cd(char **argv) FAST_FUNC;
|
|
static int builtin_echo(char **argv) FAST_FUNC;
|
|
static int builtin_eval(char **argv) FAST_FUNC;
|
|
static int builtin_exec(char **argv) FAST_FUNC;
|
|
static int builtin_exit(char **argv) FAST_FUNC;
|
|
static int builtin_export(char **argv) FAST_FUNC;
|
|
#if ENABLE_HUSH_JOB
|
|
static int builtin_fg_bg(char **argv) FAST_FUNC;
|
|
static int builtin_jobs(char **argv) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_HUSH_HELP
|
|
static int builtin_help(char **argv) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_HUSH_LOCAL
|
|
static int builtin_local(char **argv) FAST_FUNC;
|
|
#endif
|
|
#if HUSH_DEBUG
|
|
static int builtin_memleak(char **argv) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_PRINTF
|
|
static int builtin_printf(char **argv) FAST_FUNC;
|
|
#endif
|
|
static int builtin_pwd(char **argv) FAST_FUNC;
|
|
static int builtin_read(char **argv) FAST_FUNC;
|
|
static int builtin_set(char **argv) FAST_FUNC;
|
|
static int builtin_shift(char **argv) FAST_FUNC;
|
|
static int builtin_source(char **argv) FAST_FUNC;
|
|
static int builtin_test(char **argv) FAST_FUNC;
|
|
static int builtin_trap(char **argv) FAST_FUNC;
|
|
static int builtin_type(char **argv) FAST_FUNC;
|
|
static int builtin_true(char **argv) FAST_FUNC;
|
|
static int builtin_umask(char **argv) FAST_FUNC;
|
|
static int builtin_unset(char **argv) FAST_FUNC;
|
|
static int builtin_wait(char **argv) FAST_FUNC;
|
|
#if ENABLE_HUSH_LOOPS
|
|
static int builtin_break(char **argv) FAST_FUNC;
|
|
static int builtin_continue(char **argv) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static int builtin_return(char **argv) FAST_FUNC;
|
|
#endif
|
|
|
|
/* Table of built-in functions. They can be forked or not, depending on
|
|
* context: within pipes, they fork. As simple commands, they do not.
|
|
* When used in non-forking context, they can change global variables
|
|
* in the parent shell process. If forked, of course they cannot.
|
|
* For example, 'unset foo | whatever' will parse and run, but foo will
|
|
* still be set at the end. */
|
|
struct built_in_command {
|
|
const char *b_cmd;
|
|
int (*b_function)(char **argv) FAST_FUNC;
|
|
#if ENABLE_HUSH_HELP
|
|
const char *b_descr;
|
|
# define BLTIN(cmd, func, help) { cmd, func, help }
|
|
#else
|
|
# define BLTIN(cmd, func, help) { cmd, func }
|
|
#endif
|
|
};
|
|
|
|
static const struct built_in_command bltins1[] = {
|
|
BLTIN("." , builtin_source , "Run commands in a file"),
|
|
BLTIN(":" , builtin_true , NULL),
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
BLTIN("break" , builtin_break , "Exit from a loop"),
|
|
#endif
|
|
BLTIN("cd" , builtin_cd , "Change directory"),
|
|
#if ENABLE_HUSH_LOOPS
|
|
BLTIN("continue" , builtin_continue, "Start new loop iteration"),
|
|
#endif
|
|
BLTIN("eval" , builtin_eval , "Construct and run shell command"),
|
|
BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
|
|
BLTIN("exit" , builtin_exit , "Exit"),
|
|
BLTIN("export" , builtin_export , "Set environment variables"),
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
|
|
#endif
|
|
#if ENABLE_HUSH_HELP
|
|
BLTIN("help" , builtin_help , NULL),
|
|
#endif
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("jobs" , builtin_jobs , "List jobs"),
|
|
#endif
|
|
#if ENABLE_HUSH_LOCAL
|
|
BLTIN("local" , builtin_local , "Set local variables"),
|
|
#endif
|
|
#if HUSH_DEBUG
|
|
BLTIN("memleak" , builtin_memleak , NULL),
|
|
#endif
|
|
BLTIN("read" , builtin_read , "Input into variable"),
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
BLTIN("return" , builtin_return , "Return from a function"),
|
|
#endif
|
|
BLTIN("set" , builtin_set , "Set/unset positional parameters"),
|
|
BLTIN("shift" , builtin_shift , "Shift positional parameters"),
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
BLTIN("source" , builtin_source , "Run commands in a file"),
|
|
#endif
|
|
BLTIN("trap" , builtin_trap , "Trap signals"),
|
|
BLTIN("type" , builtin_type , "Show command type"),
|
|
BLTIN("ulimit" , shell_builtin_ulimit , "Control resource limits"),
|
|
BLTIN("umask" , builtin_umask , "Set file creation mask"),
|
|
BLTIN("unset" , builtin_unset , "Unset variables"),
|
|
BLTIN("wait" , builtin_wait , "Wait for process"),
|
|
};
|
|
/* For now, echo and test are unconditionally enabled.
|
|
* Maybe make it configurable? */
|
|
static const struct built_in_command bltins2[] = {
|
|
BLTIN("[" , builtin_test , NULL),
|
|
BLTIN("echo" , builtin_echo , NULL),
|
|
#if ENABLE_PRINTF
|
|
BLTIN("printf" , builtin_printf , NULL),
|
|
#endif
|
|
BLTIN("pwd" , builtin_pwd , NULL),
|
|
BLTIN("test" , builtin_test , NULL),
|
|
};
|
|
|
|
|
|
/* Debug printouts.
|
|
*/
|
|
#if HUSH_DEBUG
|
|
/* prevent disasters with G.debug_indent < 0 */
|
|
# define indent() fdprintf(2, "%*s", (G.debug_indent * 2) & 0xff, "")
|
|
# define debug_enter() (G.debug_indent++)
|
|
# define debug_leave() (G.debug_indent--)
|
|
#else
|
|
# define indent() ((void)0)
|
|
# define debug_enter() ((void)0)
|
|
# define debug_leave() ((void)0)
|
|
#endif
|
|
|
|
#ifndef debug_printf
|
|
# define debug_printf(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_parse
|
|
# define debug_printf_parse(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_exec
|
|
#define debug_printf_exec(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_env
|
|
# define debug_printf_env(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_jobs
|
|
# define debug_printf_jobs(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
# define DEBUG_JOBS 1
|
|
#else
|
|
# define DEBUG_JOBS 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_expand
|
|
# define debug_printf_expand(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
# define DEBUG_EXPAND 1
|
|
#else
|
|
# define DEBUG_EXPAND 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_varexp
|
|
# define debug_printf_varexp(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_glob
|
|
# define debug_printf_glob(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
# define DEBUG_GLOB 1
|
|
#else
|
|
# define DEBUG_GLOB 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_list
|
|
# define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_subst
|
|
# define debug_printf_subst(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_clean
|
|
# define debug_printf_clean(...) (indent(), fdprintf(2, __VA_ARGS__))
|
|
# define DEBUG_CLEAN 1
|
|
#else
|
|
# define DEBUG_CLEAN 0
|
|
#endif
|
|
|
|
#if DEBUG_EXPAND
|
|
static void debug_print_strings(const char *prefix, char **vv)
|
|
{
|
|
indent();
|
|
fdprintf(2, "%s:\n", prefix);
|
|
while (*vv)
|
|
fdprintf(2, " '%s'\n", *vv++);
|
|
}
|
|
#else
|
|
# define debug_print_strings(prefix, vv) ((void)0)
|
|
#endif
|
|
|
|
|
|
/* Leak hunting. Use hush_leaktool.sh for post-processing.
|
|
*/
|
|
#if LEAK_HUNTING
|
|
static void *xxmalloc(int lineno, size_t size)
|
|
{
|
|
void *ptr = xmalloc((size + 0xff) & ~0xff);
|
|
fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static void *xxrealloc(int lineno, void *ptr, size_t size)
|
|
{
|
|
ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
|
|
fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static char *xxstrdup(int lineno, const char *str)
|
|
{
|
|
char *ptr = xstrdup(str);
|
|
fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static void xxfree(void *ptr)
|
|
{
|
|
fdprintf(2, "free %p\n", ptr);
|
|
free(ptr);
|
|
}
|
|
# define xmalloc(s) xxmalloc(__LINE__, s)
|
|
# define xrealloc(p, s) xxrealloc(__LINE__, p, s)
|
|
# define xstrdup(s) xxstrdup(__LINE__, s)
|
|
# define free(p) xxfree(p)
|
|
#endif
|
|
|
|
|
|
/* Syntax and runtime errors. They always abort scripts.
|
|
* In interactive use they usually discard unparsed and/or unexecuted commands
|
|
* and return to the prompt.
|
|
* HUSH_DEBUG >= 2 prints line number in this file where it was detected.
|
|
*/
|
|
#if HUSH_DEBUG < 2
|
|
# define die_if_script(lineno, ...) die_if_script(__VA_ARGS__)
|
|
# define syntax_error(lineno, msg) syntax_error(msg)
|
|
# define syntax_error_at(lineno, msg) syntax_error_at(msg)
|
|
# define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch)
|
|
# define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s)
|
|
# define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch)
|
|
#endif
|
|
|
|
static void die_if_script(unsigned lineno, const char *fmt, ...)
|
|
{
|
|
va_list p;
|
|
|
|
#if HUSH_DEBUG >= 2
|
|
bb_error_msg("hush.c:%u", lineno);
|
|
#endif
|
|
va_start(p, fmt);
|
|
bb_verror_msg(fmt, p, NULL);
|
|
va_end(p);
|
|
if (!G_interactive_fd)
|
|
xfunc_die();
|
|
}
|
|
|
|
static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg)
|
|
{
|
|
if (msg)
|
|
bb_error_msg("syntax error: %s", msg);
|
|
else
|
|
bb_error_msg("syntax error");
|
|
}
|
|
|
|
static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
|
|
{
|
|
bb_error_msg("syntax error at '%s'", msg);
|
|
}
|
|
|
|
static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
|
|
{
|
|
bb_error_msg("syntax error: unterminated %s", s);
|
|
}
|
|
|
|
static void syntax_error_unterm_ch(unsigned lineno, char ch)
|
|
{
|
|
char msg[2] = { ch, '\0' };
|
|
syntax_error_unterm_str(lineno, msg);
|
|
}
|
|
|
|
static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch)
|
|
{
|
|
char msg[2];
|
|
msg[0] = ch;
|
|
msg[1] = '\0';
|
|
bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
|
|
}
|
|
|
|
#if HUSH_DEBUG < 2
|
|
# undef die_if_script
|
|
# undef syntax_error
|
|
# undef syntax_error_at
|
|
# undef syntax_error_unterm_ch
|
|
# undef syntax_error_unterm_str
|
|
# undef syntax_error_unexpected_ch
|
|
#else
|
|
# define die_if_script(...) die_if_script(__LINE__, __VA_ARGS__)
|
|
# define syntax_error(msg) syntax_error(__LINE__, msg)
|
|
# define syntax_error_at(msg) syntax_error_at(__LINE__, msg)
|
|
# define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch)
|
|
# define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s)
|
|
# define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch)
|
|
#endif
|
|
|
|
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
static void cmdedit_update_prompt(void);
|
|
#else
|
|
# define cmdedit_update_prompt() ((void)0)
|
|
#endif
|
|
|
|
|
|
/* Utility functions
|
|
*/
|
|
/* Replace each \x with x in place, return ptr past NUL. */
|
|
static char *unbackslash(char *src)
|
|
{
|
|
char *dst = src = strchrnul(src, '\\');
|
|
while (1) {
|
|
if (*src == '\\')
|
|
src++;
|
|
if ((*dst++ = *src++) == '\0')
|
|
break;
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
|
|
{
|
|
int i;
|
|
unsigned count1;
|
|
unsigned count2;
|
|
char **v;
|
|
|
|
v = strings;
|
|
count1 = 0;
|
|
if (v) {
|
|
while (*v) {
|
|
count1++;
|
|
v++;
|
|
}
|
|
}
|
|
count2 = 0;
|
|
v = add;
|
|
while (*v) {
|
|
count2++;
|
|
v++;
|
|
}
|
|
v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
|
|
v[count1 + count2] = NULL;
|
|
i = count2;
|
|
while (--i >= 0)
|
|
v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
|
|
return v;
|
|
}
|
|
#if LEAK_HUNTING
|
|
static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup)
|
|
{
|
|
char **ptr = add_strings_to_strings(strings, add, need_to_dup);
|
|
fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
#define add_strings_to_strings(strings, add, need_to_dup) \
|
|
xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup)
|
|
#endif
|
|
|
|
/* Note: takes ownership of "add" ptr (it is not strdup'ed) */
|
|
static char **add_string_to_strings(char **strings, char *add)
|
|
{
|
|
char *v[2];
|
|
v[0] = add;
|
|
v[1] = NULL;
|
|
return add_strings_to_strings(strings, v, /*dup:*/ 0);
|
|
}
|
|
#if LEAK_HUNTING
|
|
static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
|
|
{
|
|
char **ptr = add_string_to_strings(strings, add);
|
|
fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
#define add_string_to_strings(strings, add) \
|
|
xx_add_string_to_strings(__LINE__, strings, add)
|
|
#endif
|
|
|
|
static void free_strings(char **strings)
|
|
{
|
|
char **v;
|
|
|
|
if (!strings)
|
|
return;
|
|
v = strings;
|
|
while (*v) {
|
|
free(*v);
|
|
v++;
|
|
}
|
|
free(strings);
|
|
}
|
|
|
|
|
|
/* Helpers for setting new $n and restoring them back
|
|
*/
|
|
typedef struct save_arg_t {
|
|
char *sv_argv0;
|
|
char **sv_g_argv;
|
|
int sv_g_argc;
|
|
smallint sv_g_malloced;
|
|
} save_arg_t;
|
|
|
|
static void save_and_replace_G_args(save_arg_t *sv, char **argv)
|
|
{
|
|
int n;
|
|
|
|
sv->sv_argv0 = argv[0];
|
|
sv->sv_g_argv = G.global_argv;
|
|
sv->sv_g_argc = G.global_argc;
|
|
sv->sv_g_malloced = G.global_args_malloced;
|
|
|
|
argv[0] = G.global_argv[0]; /* retain $0 */
|
|
G.global_argv = argv;
|
|
G.global_args_malloced = 0;
|
|
|
|
n = 1;
|
|
while (*++argv)
|
|
n++;
|
|
G.global_argc = n;
|
|
}
|
|
|
|
static void restore_G_args(save_arg_t *sv, char **argv)
|
|
{
|
|
char **pp;
|
|
|
|
if (G.global_args_malloced) {
|
|
/* someone ran "set -- arg1 arg2 ...", undo */
|
|
pp = G.global_argv;
|
|
while (*++pp) /* note: does not free $0 */
|
|
free(*pp);
|
|
free(G.global_argv);
|
|
}
|
|
argv[0] = sv->sv_argv0;
|
|
G.global_argv = sv->sv_g_argv;
|
|
G.global_argc = sv->sv_g_argc;
|
|
G.global_args_malloced = sv->sv_g_malloced;
|
|
}
|
|
|
|
|
|
/* Basic theory of signal handling in shell
|
|
* ========================================
|
|
* This does not describe what hush does, rather, it is current understanding
|
|
* what it _should_ do. If it doesn't, it's a bug.
|
|
* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
|
|
*
|
|
* Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
|
|
* is finished or backgrounded. It is the same in interactive and
|
|
* non-interactive shells, and is the same regardless of whether
|
|
* a user trap handler is installed or a shell special one is in effect.
|
|
* ^C or ^Z from keyboard seems to execute "at once" because it usually
|
|
* backgrounds (i.e. stops) or kills all members of currently running
|
|
* pipe.
|
|
*
|
|
* Wait builtin in interruptible by signals for which user trap is set
|
|
* or by SIGINT in interactive shell.
|
|
*
|
|
* Trap handlers will execute even within trap handlers. (right?)
|
|
*
|
|
* User trap handlers are forgotten when subshell ("(cmd)") is entered,
|
|
* except for handlers set to '' (empty string).
|
|
*
|
|
* If job control is off, backgrounded commands ("cmd &")
|
|
* have SIGINT, SIGQUIT set to SIG_IGN.
|
|
*
|
|
* Commands which are run in command substitution ("`cmd`")
|
|
* have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
|
|
*
|
|
* Ordinary commands have signals set to SIG_IGN/DFL as inherited
|
|
* by the shell from its parent.
|
|
*
|
|
* Signals which differ from SIG_DFL action
|
|
* (note: child (i.e., [v]forked) shell is not an interactive shell):
|
|
*
|
|
* SIGQUIT: ignore
|
|
* SIGTERM (interactive): ignore
|
|
* SIGHUP (interactive):
|
|
* send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
|
|
* SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
|
|
* Note that ^Z is handled not by trapping SIGTSTP, but by seeing
|
|
* that all pipe members are stopped. Try this in bash:
|
|
* while :; do :; done - ^Z does not background it
|
|
* (while :; do :; done) - ^Z backgrounds it
|
|
* SIGINT (interactive): wait for last pipe, ignore the rest
|
|
* of the command line, show prompt. NB: ^C does not send SIGINT
|
|
* to interactive shell while shell is waiting for a pipe,
|
|
* since shell is bg'ed (is not in foreground process group).
|
|
* Example 1: this waits 5 sec, but does not execute ls:
|
|
* "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
|
|
* Example 2: this does not wait and does not execute ls:
|
|
* "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
|
|
* Example 3: this does not wait 5 sec, but executes ls:
|
|
* "sleep 5; ls -l" + press ^C
|
|
* Example 4: this does not wait and does not execute ls:
|
|
* "sleep 5 & wait; ls -l" + press ^C
|
|
*
|
|
* (What happens to signals which are IGN on shell start?)
|
|
* (What happens with signal mask on shell start?)
|
|
*
|
|
* Old implementation
|
|
* ==================
|
|
* We use in-kernel pending signal mask to determine which signals were sent.
|
|
* We block all signals which we don't want to take action immediately,
|
|
* i.e. we block all signals which need to have special handling as described
|
|
* above, and all signals which have traps set.
|
|
* After each pipe execution, we extract any pending signals via sigtimedwait()
|
|
* and act on them.
|
|
*
|
|
* unsigned special_sig_mask: a mask of such "special" signals
|
|
* sigset_t blocked_set: current blocked signal set
|
|
*
|
|
* "trap - SIGxxx":
|
|
* clear bit in blocked_set unless it is also in special_sig_mask
|
|
* "trap 'cmd' SIGxxx":
|
|
* set bit in blocked_set (even if 'cmd' is '')
|
|
* after [v]fork, if we plan to be a shell:
|
|
* unblock signals with special interactive handling
|
|
* (child shell is not interactive),
|
|
* unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
|
|
* after [v]fork, if we plan to exec:
|
|
* POSIX says fork clears pending signal mask in child - no need to clear it.
|
|
* Restore blocked signal set to one inherited by shell just prior to exec.
|
|
*
|
|
* Note: as a result, we do not use signal handlers much. The only uses
|
|
* are to count SIGCHLDs
|
|
* and to restore tty pgrp on signal-induced exit.
|
|
*
|
|
* Note 2 (compat):
|
|
* Standard says "When a subshell is entered, traps that are not being ignored
|
|
* are set to the default actions". bash interprets it so that traps which
|
|
* are set to '' (ignore) are NOT reset to defaults. We do the same.
|
|
*
|
|
* Problem: the above approach makes it unwieldy to catch signals while
|
|
* we are in read builtin, of while we read commands from stdin:
|
|
* masked signals are not visible!
|
|
*
|
|
* New implementation
|
|
* ==================
|
|
* We record each signal we are interested in by installing signal handler
|
|
* for them - a bit like emulating kernel pending signal mask in userspace.
|
|
* We are interested in: signals which need to have special handling
|
|
* as described above, and all signals which have traps set.
|
|
* Signals are rocorded in pending_set.
|
|
* After each pipe execution, we extract any pending signals
|
|
* and act on them.
|
|
*
|
|
* unsigned special_sig_mask: a mask of shell-special signals.
|
|
* unsigned fatal_sig_mask: a mask of signals on which we restore tty pgrp.
|
|
* char *traps[sig] if trap for sig is set (even if it's '').
|
|
* sigset_t pending_set: set of sigs we received.
|
|
*
|
|
* "trap - SIGxxx":
|
|
* if sig is in special_sig_mask, set handler back to:
|
|
* record_pending_signo, or to IGN if it's a tty stop signal
|
|
* if sig is in fatal_sig_mask, set handler back to sigexit.
|
|
* else: set handler back to SIG_DFL
|
|
* "trap 'cmd' SIGxxx":
|
|
* set handler to record_pending_signo.
|
|
* "trap '' SIGxxx":
|
|
* set handler to SIG_IGN.
|
|
* after [v]fork, if we plan to be a shell:
|
|
* set signals with special interactive handling to SIG_DFL
|
|
* (because child shell is not interactive),
|
|
* unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
|
|
* after [v]fork, if we plan to exec:
|
|
* POSIX says fork clears pending signal mask in child - no need to clear it.
|
|
*
|
|
* To make wait builtin interruptible, we handle SIGCHLD as special signal,
|
|
* otherwise (if we leave it SIG_DFL) sigsuspend in wait builtin will not wake up on it.
|
|
*
|
|
* Note (compat):
|
|
* Standard says "When a subshell is entered, traps that are not being ignored
|
|
* are set to the default actions". bash interprets it so that traps which
|
|
* are set to '' (ignore) are NOT reset to defaults. We do the same.
|
|
*/
|
|
enum {
|
|
SPECIAL_INTERACTIVE_SIGS = 0
|
|
| (1 << SIGTERM)
|
|
| (1 << SIGINT)
|
|
| (1 << SIGHUP)
|
|
,
|
|
SPECIAL_JOBSTOP_SIGS = 0
|
|
#if ENABLE_HUSH_JOB
|
|
| (1 << SIGTTIN)
|
|
| (1 << SIGTTOU)
|
|
| (1 << SIGTSTP)
|
|
#endif
|
|
,
|
|
};
|
|
|
|
static void record_pending_signo(int sig)
|
|
{
|
|
sigaddset(&G.pending_set, sig);
|
|
#if ENABLE_HUSH_FAST
|
|
if (sig == SIGCHLD) {
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static sighandler_t install_sighandler(int sig, sighandler_t handler)
|
|
{
|
|
struct sigaction old_sa;
|
|
|
|
/* We could use signal() to install handlers... almost:
|
|
* except that we need to mask ALL signals while handlers run.
|
|
* I saw signal nesting in strace, race window isn't small.
|
|
* SA_RESTART is also needed, but in Linux, signal()
|
|
* sets SA_RESTART too.
|
|
*/
|
|
/* memset(&G.sa, 0, sizeof(G.sa)); - already done */
|
|
/* sigfillset(&G.sa.sa_mask); - already done */
|
|
/* G.sa.sa_flags = SA_RESTART; - already done */
|
|
G.sa.sa_handler = handler;
|
|
sigaction(sig, &G.sa, &old_sa);
|
|
return old_sa.sa_handler;
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
|
|
/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
|
|
# define disable_restore_tty_pgrp_on_exit() (die_sleep = 0)
|
|
/* After [v]fork, in parent: restore tty pgrp on xfunc death */
|
|
# define enable_restore_tty_pgrp_on_exit() (die_sleep = -1)
|
|
|
|
/* Restores tty foreground process group, and exits.
|
|
* May be called as signal handler for fatal signal
|
|
* (will resend signal to itself, producing correct exit state)
|
|
* or called directly with -EXITCODE.
|
|
* We also call it if xfunc is exiting. */
|
|
static void sigexit(int sig) NORETURN;
|
|
static void sigexit(int sig)
|
|
{
|
|
/* Careful: we can end up here after [v]fork. Do not restore
|
|
* tty pgrp then, only top-level shell process does that */
|
|
if (G_saved_tty_pgrp && getpid() == G.root_pid) {
|
|
/* Disable all signals: job control, SIGPIPE, etc.
|
|
* Mostly paranoid measure, to prevent infinite SIGTTOU.
|
|
*/
|
|
sigprocmask_allsigs(SIG_BLOCK);
|
|
tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
|
}
|
|
|
|
/* Not a signal, just exit */
|
|
if (sig <= 0)
|
|
_exit(- sig);
|
|
|
|
kill_myself_with_sig(sig); /* does not return */
|
|
}
|
|
#else
|
|
|
|
# define disable_restore_tty_pgrp_on_exit() ((void)0)
|
|
# define enable_restore_tty_pgrp_on_exit() ((void)0)
|
|
|
|
#endif
|
|
|
|
static sighandler_t pick_sighandler(unsigned sig)
|
|
{
|
|
sighandler_t handler = SIG_DFL;
|
|
if (sig < sizeof(unsigned)*8) {
|
|
unsigned sigmask = (1 << sig);
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* is sig fatal? */
|
|
if (G_fatal_sig_mask & sigmask)
|
|
handler = sigexit;
|
|
else
|
|
#endif
|
|
/* sig has special handling? */
|
|
if (G.special_sig_mask & sigmask) {
|
|
handler = record_pending_signo;
|
|
/* TTIN/TTOU/TSTP can't be set to record_pending_signo
|
|
* in order to ignore them: they will be raised
|
|
* in an endless loop when we try to do some
|
|
* terminal ioctls! We do have to _ignore_ these.
|
|
*/
|
|
if (SPECIAL_JOBSTOP_SIGS & sigmask)
|
|
handler = SIG_IGN;
|
|
}
|
|
}
|
|
return handler;
|
|
}
|
|
|
|
/* Restores tty foreground process group, and exits. */
|
|
static void hush_exit(int exitcode) NORETURN;
|
|
static void hush_exit(int exitcode)
|
|
{
|
|
fflush_all();
|
|
if (G.exiting <= 0 && G.traps && G.traps[0] && G.traps[0][0]) {
|
|
char *argv[3];
|
|
/* argv[0] is unused */
|
|
argv[1] = G.traps[0];
|
|
argv[2] = NULL;
|
|
G.exiting = 1; /* prevent EXIT trap recursion */
|
|
/* Note: G.traps[0] is not cleared!
|
|
* "trap" will still show it, if executed
|
|
* in the handler */
|
|
builtin_eval(argv);
|
|
}
|
|
|
|
#if ENABLE_FEATURE_CLEAN_UP
|
|
{
|
|
struct variable *cur_var;
|
|
if (G.cwd != bb_msg_unknown)
|
|
free((char*)G.cwd);
|
|
cur_var = G.top_var;
|
|
while (cur_var) {
|
|
struct variable *tmp = cur_var;
|
|
if (!cur_var->max_len)
|
|
free(cur_var->varstr);
|
|
cur_var = cur_var->next;
|
|
free(tmp);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
fflush_all();
|
|
sigexit(- (exitcode & 0xff));
|
|
#else
|
|
exit(exitcode);
|
|
#endif
|
|
}
|
|
|
|
|
|
//TODO: return a mask of ALL handled sigs?
|
|
static int check_and_run_traps(void)
|
|
{
|
|
int last_sig = 0;
|
|
|
|
while (1) {
|
|
int sig;
|
|
|
|
if (sigisemptyset(&G.pending_set))
|
|
break;
|
|
sig = 0;
|
|
do {
|
|
sig++;
|
|
if (sigismember(&G.pending_set, sig)) {
|
|
sigdelset(&G.pending_set, sig);
|
|
goto got_sig;
|
|
}
|
|
} while (sig < NSIG);
|
|
break;
|
|
got_sig:
|
|
if (G.traps && G.traps[sig]) {
|
|
if (G.traps[sig][0]) {
|
|
/* We have user-defined handler */
|
|
smalluint save_rcode;
|
|
char *argv[3];
|
|
/* argv[0] is unused */
|
|
argv[1] = G.traps[sig];
|
|
argv[2] = NULL;
|
|
save_rcode = G.last_exitcode;
|
|
builtin_eval(argv);
|
|
G.last_exitcode = save_rcode;
|
|
last_sig = sig;
|
|
} /* else: "" trap, ignoring signal */
|
|
continue;
|
|
}
|
|
/* not a trap: special action */
|
|
switch (sig) {
|
|
case SIGINT:
|
|
/* Builtin was ^C'ed, make it look prettier: */
|
|
bb_putchar('\n');
|
|
G.flag_SIGINT = 1;
|
|
last_sig = sig;
|
|
break;
|
|
#if ENABLE_HUSH_JOB
|
|
case SIGHUP: {
|
|
struct pipe *job;
|
|
/* bash is observed to signal whole process groups,
|
|
* not individual processes */
|
|
for (job = G.job_list; job; job = job->next) {
|
|
if (job->pgrp <= 0)
|
|
continue;
|
|
debug_printf_exec("HUPing pgrp %d\n", job->pgrp);
|
|
if (kill(- job->pgrp, SIGHUP) == 0)
|
|
kill(- job->pgrp, SIGCONT);
|
|
}
|
|
sigexit(SIGHUP);
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_FAST
|
|
case SIGCHLD:
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
/* Note:
|
|
* We dont do 'last_sig = sig' here -> NOT returning this sig.
|
|
* This simplifies wait builtin a bit.
|
|
*/
|
|
break;
|
|
#endif
|
|
default: /* ignored: */
|
|
/* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
|
|
/* Note:
|
|
* We dont do 'last_sig = sig' here -> NOT returning this sig.
|
|
* Example: wait is not interrupted by TERM
|
|
* in interactive shell, because TERM is ignored.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
return last_sig;
|
|
}
|
|
|
|
|
|
static const char *get_cwd(int force)
|
|
{
|
|
if (force || G.cwd == NULL) {
|
|
/* xrealloc_getcwd_or_warn(arg) calls free(arg),
|
|
* we must not try to free(bb_msg_unknown) */
|
|
if (G.cwd == bb_msg_unknown)
|
|
G.cwd = NULL;
|
|
G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
|
|
if (!G.cwd)
|
|
G.cwd = bb_msg_unknown;
|
|
}
|
|
return G.cwd;
|
|
}
|
|
|
|
|
|
/*
|
|
* Shell and environment variable support
|
|
*/
|
|
static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
|
|
{
|
|
struct variable **pp;
|
|
struct variable *cur;
|
|
|
|
pp = &G.top_var;
|
|
while ((cur = *pp) != NULL) {
|
|
if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
|
|
return pp;
|
|
pp = &cur->next;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const char* FAST_FUNC get_local_var_value(const char *name)
|
|
{
|
|
struct variable **vpp;
|
|
unsigned len = strlen(name);
|
|
|
|
if (G.expanded_assignments) {
|
|
char **cpp = G.expanded_assignments;
|
|
while (*cpp) {
|
|
char *cp = *cpp;
|
|
if (strncmp(cp, name, len) == 0 && cp[len] == '=')
|
|
return cp + len + 1;
|
|
cpp++;
|
|
}
|
|
}
|
|
|
|
vpp = get_ptr_to_local_var(name, len);
|
|
if (vpp)
|
|
return (*vpp)->varstr + len + 1;
|
|
|
|
if (strcmp(name, "PPID") == 0)
|
|
return utoa(G.root_ppid);
|
|
// bash compat: UID? EUID?
|
|
#if ENABLE_HUSH_RANDOM_SUPPORT
|
|
if (strcmp(name, "RANDOM") == 0)
|
|
return utoa(next_random(&G.random_gen));
|
|
#endif
|
|
return NULL;
|
|
}
|
|
|
|
/* str holds "NAME=VAL" and is expected to be malloced.
|
|
* We take ownership of it.
|
|
* flg_export:
|
|
* 0: do not change export flag
|
|
* (if creating new variable, flag will be 0)
|
|
* 1: set export flag and putenv the variable
|
|
* -1: clear export flag and unsetenv the variable
|
|
* flg_read_only is set only when we handle -R var=val
|
|
*/
|
|
#if !BB_MMU && ENABLE_HUSH_LOCAL
|
|
/* all params are used */
|
|
#elif BB_MMU && ENABLE_HUSH_LOCAL
|
|
#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
|
set_local_var(str, flg_export, local_lvl)
|
|
#elif BB_MMU && !ENABLE_HUSH_LOCAL
|
|
#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
|
set_local_var(str, flg_export)
|
|
#elif !BB_MMU && !ENABLE_HUSH_LOCAL
|
|
#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
|
set_local_var(str, flg_export, flg_read_only)
|
|
#endif
|
|
static int set_local_var(char *str, int flg_export, int local_lvl, int flg_read_only)
|
|
{
|
|
struct variable **var_pp;
|
|
struct variable *cur;
|
|
char *eq_sign;
|
|
int name_len;
|
|
|
|
eq_sign = strchr(str, '=');
|
|
if (!eq_sign) { /* not expected to ever happen? */
|
|
free(str);
|
|
return -1;
|
|
}
|
|
|
|
name_len = eq_sign - str + 1; /* including '=' */
|
|
var_pp = &G.top_var;
|
|
while ((cur = *var_pp) != NULL) {
|
|
if (strncmp(cur->varstr, str, name_len) != 0) {
|
|
var_pp = &cur->next;
|
|
continue;
|
|
}
|
|
/* We found an existing var with this name */
|
|
if (cur->flg_read_only) {
|
|
#if !BB_MMU
|
|
if (!flg_read_only)
|
|
#endif
|
|
bb_error_msg("%s: readonly variable", str);
|
|
free(str);
|
|
return -1;
|
|
}
|
|
if (flg_export == -1) { // "&& cur->flg_export" ?
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
|
|
*eq_sign = '\0';
|
|
unsetenv(str);
|
|
*eq_sign = '=';
|
|
}
|
|
#if ENABLE_HUSH_LOCAL
|
|
if (cur->func_nest_level < local_lvl) {
|
|
/* New variable is declared as local,
|
|
* and existing one is global, or local
|
|
* from enclosing function.
|
|
* Remove and save old one: */
|
|
*var_pp = cur->next;
|
|
cur->next = *G.shadowed_vars_pp;
|
|
*G.shadowed_vars_pp = cur;
|
|
/* bash 3.2.33(1) and exported vars:
|
|
* # export z=z
|
|
* # f() { local z=a; env | grep ^z; }
|
|
* # f
|
|
* z=a
|
|
* # env | grep ^z
|
|
* z=z
|
|
*/
|
|
if (cur->flg_export)
|
|
flg_export = 1;
|
|
break;
|
|
}
|
|
#endif
|
|
if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) {
|
|
free_and_exp:
|
|
free(str);
|
|
goto exp;
|
|
}
|
|
if (cur->max_len != 0) {
|
|
if (cur->max_len >= strlen(str)) {
|
|
/* This one is from startup env, reuse space */
|
|
strcpy(cur->varstr, str);
|
|
goto free_and_exp;
|
|
}
|
|
} else {
|
|
/* max_len == 0 signifies "malloced" var, which we can
|
|
* (and has to) free */
|
|
free(cur->varstr);
|
|
}
|
|
cur->max_len = 0;
|
|
goto set_str_and_exp;
|
|
}
|
|
|
|
/* Not found - create new variable struct */
|
|
cur = xzalloc(sizeof(*cur));
|
|
#if ENABLE_HUSH_LOCAL
|
|
cur->func_nest_level = local_lvl;
|
|
#endif
|
|
cur->next = *var_pp;
|
|
*var_pp = cur;
|
|
|
|
set_str_and_exp:
|
|
cur->varstr = str;
|
|
#if !BB_MMU
|
|
cur->flg_read_only = flg_read_only;
|
|
#endif
|
|
exp:
|
|
if (flg_export == 1)
|
|
cur->flg_export = 1;
|
|
if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
|
cmdedit_update_prompt();
|
|
if (cur->flg_export) {
|
|
if (flg_export == -1) {
|
|
cur->flg_export = 0;
|
|
/* unsetenv was already done */
|
|
} else {
|
|
debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
|
|
return putenv(cur->varstr);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Used at startup and after each cd */
|
|
static void set_pwd_var(int exp)
|
|
{
|
|
set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)),
|
|
/*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0);
|
|
}
|
|
|
|
static int unset_local_var_len(const char *name, int name_len)
|
|
{
|
|
struct variable *cur;
|
|
struct variable **var_pp;
|
|
|
|
if (!name)
|
|
return EXIT_SUCCESS;
|
|
var_pp = &G.top_var;
|
|
while ((cur = *var_pp) != NULL) {
|
|
if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
|
|
if (cur->flg_read_only) {
|
|
bb_error_msg("%s: readonly variable", name);
|
|
return EXIT_FAILURE;
|
|
}
|
|
*var_pp = cur->next;
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
|
|
bb_unsetenv(cur->varstr);
|
|
if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
|
cmdedit_update_prompt();
|
|
if (!cur->max_len)
|
|
free(cur->varstr);
|
|
free(cur);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
var_pp = &cur->next;
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int unset_local_var(const char *name)
|
|
{
|
|
return unset_local_var_len(name, strlen(name));
|
|
}
|
|
|
|
static void unset_vars(char **strings)
|
|
{
|
|
char **v;
|
|
|
|
if (!strings)
|
|
return;
|
|
v = strings;
|
|
while (*v) {
|
|
const char *eq = strchrnul(*v, '=');
|
|
unset_local_var_len(*v, (int)(eq - *v));
|
|
v++;
|
|
}
|
|
free(strings);
|
|
}
|
|
|
|
static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
|
|
{
|
|
char *var = xasprintf("%s=%s", name, val);
|
|
set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Helpers for "var1=val1 var2=val2 cmd" feature
|
|
*/
|
|
static void add_vars(struct variable *var)
|
|
{
|
|
struct variable *next;
|
|
|
|
while (var) {
|
|
next = var->next;
|
|
var->next = G.top_var;
|
|
G.top_var = var;
|
|
if (var->flg_export) {
|
|
debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr);
|
|
putenv(var->varstr);
|
|
} else {
|
|
debug_printf_env("%s: restoring variable '%s'\n", __func__, var->varstr);
|
|
}
|
|
var = next;
|
|
}
|
|
}
|
|
|
|
static struct variable *set_vars_and_save_old(char **strings)
|
|
{
|
|
char **s;
|
|
struct variable *old = NULL;
|
|
|
|
if (!strings)
|
|
return old;
|
|
s = strings;
|
|
while (*s) {
|
|
struct variable *var_p;
|
|
struct variable **var_pp;
|
|
char *eq;
|
|
|
|
eq = strchr(*s, '=');
|
|
if (eq) {
|
|
var_pp = get_ptr_to_local_var(*s, eq - *s);
|
|
if (var_pp) {
|
|
/* Remove variable from global linked list */
|
|
var_p = *var_pp;
|
|
debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
|
|
*var_pp = var_p->next;
|
|
/* Add it to returned list */
|
|
var_p->next = old;
|
|
old = var_p;
|
|
}
|
|
set_local_var(*s, /*exp:*/ 1, /*lvl:*/ 0, /*ro:*/ 0);
|
|
}
|
|
s++;
|
|
}
|
|
return old;
|
|
}
|
|
|
|
|
|
/*
|
|
* in_str support
|
|
*/
|
|
static int FAST_FUNC static_get(struct in_str *i)
|
|
{
|
|
int ch = *i->p;
|
|
if (ch != '\0') {
|
|
i->p++;
|
|
i->last_char = ch;
|
|
return ch;
|
|
}
|
|
return EOF;
|
|
}
|
|
|
|
static int FAST_FUNC static_peek(struct in_str *i)
|
|
{
|
|
return *i->p;
|
|
}
|
|
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
|
|
static void cmdedit_update_prompt(void)
|
|
{
|
|
if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
|
G.PS1 = get_local_var_value("PS1");
|
|
if (G.PS1 == NULL)
|
|
G.PS1 = "\\w \\$ ";
|
|
G.PS2 = get_local_var_value("PS2");
|
|
} else {
|
|
G.PS1 = NULL;
|
|
}
|
|
if (G.PS2 == NULL)
|
|
G.PS2 = "> ";
|
|
}
|
|
|
|
static const char *setup_prompt_string(int promptmode)
|
|
{
|
|
const char *prompt_str;
|
|
debug_printf("setup_prompt_string %d ", promptmode);
|
|
if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
|
/* Set up the prompt */
|
|
if (promptmode == 0) { /* PS1 */
|
|
free((char*)G.PS1);
|
|
/* bash uses $PWD value, even if it is set by user.
|
|
* It uses current dir only if PWD is unset.
|
|
* We always use current dir. */
|
|
G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
|
|
prompt_str = G.PS1;
|
|
} else
|
|
prompt_str = G.PS2;
|
|
} else
|
|
prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
|
|
debug_printf("result '%s'\n", prompt_str);
|
|
return prompt_str;
|
|
}
|
|
|
|
static void get_user_input(struct in_str *i)
|
|
{
|
|
int r;
|
|
const char *prompt_str;
|
|
|
|
prompt_str = setup_prompt_string(i->promptmode);
|
|
# if ENABLE_FEATURE_EDITING
|
|
/* Enable command line editing only while a command line
|
|
* is actually being read */
|
|
do {
|
|
/* Unicode support should be activated even if LANG is set
|
|
* _during_ shell execution, not only if it was set when
|
|
* shell was started. Therefore, re-check LANG every time:
|
|
*/
|
|
reinit_unicode(get_local_var_value("LANG"));
|
|
|
|
G.flag_SIGINT = 0;
|
|
/* buglet: SIGINT will not make new prompt to appear _at once_,
|
|
* only after <Enter>. (^C will work) */
|
|
r = read_line_input(G.line_input_state, prompt_str, G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1, /*timeout*/ -1);
|
|
/* catch *SIGINT* etc (^C is handled by read_line_input) */
|
|
check_and_run_traps();
|
|
} while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
|
|
i->eof_flag = (r < 0);
|
|
if (i->eof_flag) { /* EOF/error detected */
|
|
G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
|
|
G.user_input_buf[1] = '\0';
|
|
}
|
|
# else
|
|
do {
|
|
G.flag_SIGINT = 0;
|
|
if (i->last_char == '\0' || i->last_char == '\n') {
|
|
/* Why check_and_run_traps here? Try this interactively:
|
|
* $ trap 'echo INT' INT; (sleep 2; kill -INT $$) &
|
|
* $ <[enter], repeatedly...>
|
|
* Without check_and_run_traps, handler never runs.
|
|
*/
|
|
check_and_run_traps();
|
|
fputs(prompt_str, stdout);
|
|
}
|
|
fflush_all();
|
|
G.user_input_buf[0] = r = fgetc(i->file);
|
|
/*G.user_input_buf[1] = '\0'; - already is and never changed */
|
|
} while (G.flag_SIGINT);
|
|
i->eof_flag = (r == EOF);
|
|
# endif
|
|
i->p = G.user_input_buf;
|
|
}
|
|
|
|
#endif /* INTERACTIVE */
|
|
|
|
/* This is the magic location that prints prompts
|
|
* and gets data back from the user */
|
|
static int FAST_FUNC file_get(struct in_str *i)
|
|
{
|
|
int ch;
|
|
|
|
/* If there is data waiting, eat it up */
|
|
if (i->p && *i->p) {
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
take_cached:
|
|
#endif
|
|
ch = *i->p++;
|
|
if (i->eof_flag && !*i->p)
|
|
ch = EOF;
|
|
/* note: ch is never NUL */
|
|
} else {
|
|
/* need to double check i->file because we might be doing something
|
|
* more complicated by now, like sourcing or substituting. */
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
if (G_interactive_fd && i->file == stdin) {
|
|
do {
|
|
get_user_input(i);
|
|
} while (!*i->p); /* need non-empty line */
|
|
i->promptmode = 1; /* PS2 */
|
|
goto take_cached;
|
|
}
|
|
#endif
|
|
do ch = fgetc(i->file); while (ch == '\0');
|
|
}
|
|
debug_printf("file_get: got '%c' %d\n", ch, ch);
|
|
i->last_char = ch;
|
|
return ch;
|
|
}
|
|
|
|
/* All callers guarantee this routine will never
|
|
* be used right after a newline, so prompting is not needed.
|
|
*/
|
|
static int FAST_FUNC file_peek(struct in_str *i)
|
|
{
|
|
int ch;
|
|
if (i->p && *i->p) {
|
|
if (i->eof_flag && !i->p[1])
|
|
return EOF;
|
|
return *i->p;
|
|
/* note: ch is never NUL */
|
|
}
|
|
do ch = fgetc(i->file); while (ch == '\0');
|
|
i->eof_flag = (ch == EOF);
|
|
i->peek_buf[0] = ch;
|
|
i->peek_buf[1] = '\0';
|
|
i->p = i->peek_buf;
|
|
debug_printf("file_peek: got '%c' %d\n", ch, ch);
|
|
return ch;
|
|
}
|
|
|
|
static void setup_file_in_str(struct in_str *i, FILE *f)
|
|
{
|
|
memset(i, 0, sizeof(*i));
|
|
i->peek = file_peek;
|
|
i->get = file_get;
|
|
/* i->promptmode = 0; - PS1 (memset did it) */
|
|
i->file = f;
|
|
/* i->p = NULL; */
|
|
}
|
|
|
|
static void setup_string_in_str(struct in_str *i, const char *s)
|
|
{
|
|
memset(i, 0, sizeof(*i));
|
|
i->peek = static_peek;
|
|
i->get = static_get;
|
|
/* i->promptmode = 0; - PS1 (memset did it) */
|
|
i->p = s;
|
|
/* i->eof_flag = 0; */
|
|
}
|
|
|
|
|
|
/*
|
|
* o_string support
|
|
*/
|
|
#define B_CHUNK (32 * sizeof(char*))
|
|
|
|
static void o_reset_to_empty_unquoted(o_string *o)
|
|
{
|
|
o->length = 0;
|
|
o->has_quoted_part = 0;
|
|
if (o->data)
|
|
o->data[0] = '\0';
|
|
}
|
|
|
|
static void o_free(o_string *o)
|
|
{
|
|
free(o->data);
|
|
memset(o, 0, sizeof(*o));
|
|
}
|
|
|
|
static ALWAYS_INLINE void o_free_unsafe(o_string *o)
|
|
{
|
|
free(o->data);
|
|
}
|
|
|
|
static void o_grow_by(o_string *o, int len)
|
|
{
|
|
if (o->length + len > o->maxlen) {
|
|
o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
|
|
o->data = xrealloc(o->data, 1 + o->maxlen);
|
|
}
|
|
}
|
|
|
|
static void o_addchr(o_string *o, int ch)
|
|
{
|
|
debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
|
|
o_grow_by(o, 1);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addblock(o_string *o, const char *str, int len)
|
|
{
|
|
o_grow_by(o, len);
|
|
memcpy(&o->data[o->length], str, len);
|
|
o->length += len;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addstr(o_string *o, const char *str)
|
|
{
|
|
o_addblock(o, str, strlen(str));
|
|
}
|
|
|
|
#if !BB_MMU
|
|
static void nommu_addchr(o_string *o, int ch)
|
|
{
|
|
if (o)
|
|
o_addchr(o, ch);
|
|
}
|
|
#else
|
|
# define nommu_addchr(o, str) ((void)0)
|
|
#endif
|
|
|
|
static void o_addstr_with_NUL(o_string *o, const char *str)
|
|
{
|
|
o_addblock(o, str, strlen(str) + 1);
|
|
}
|
|
|
|
/*
|
|
* HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side.
|
|
* Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v.
|
|
* Apparently, on unquoted $v bash still does globbing
|
|
* ("v='*.txt'; echo $v" prints all .txt files),
|
|
* but NOT brace expansion! Thus, there should be TWO independent
|
|
* quoting mechanisms on $v expansion side: one protects
|
|
* $v from brace expansion, and other additionally protects "$v" against globbing.
|
|
* We have only second one.
|
|
*/
|
|
|
|
#if ENABLE_HUSH_BRACE_EXPANSION
|
|
# define MAYBE_BRACES "{}"
|
|
#else
|
|
# define MAYBE_BRACES ""
|
|
#endif
|
|
|
|
/* My analysis of quoting semantics tells me that state information
|
|
* is associated with a destination, not a source.
|
|
*/
|
|
static void o_addqchr(o_string *o, int ch)
|
|
{
|
|
int sz = 1;
|
|
char *found = strchr("*?[\\" MAYBE_BRACES, ch);
|
|
if (found)
|
|
sz++;
|
|
o_grow_by(o, sz);
|
|
if (found) {
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addQchr(o_string *o, int ch)
|
|
{
|
|
int sz = 1;
|
|
if ((o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)
|
|
&& strchr("*?[\\" MAYBE_BRACES, ch)
|
|
) {
|
|
sz++;
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o_grow_by(o, sz);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addqblock(o_string *o, const char *str, int len)
|
|
{
|
|
while (len) {
|
|
char ch;
|
|
int sz;
|
|
int ordinary_cnt = strcspn(str, "*?[\\" MAYBE_BRACES);
|
|
if (ordinary_cnt > len) /* paranoia */
|
|
ordinary_cnt = len;
|
|
o_addblock(o, str, ordinary_cnt);
|
|
if (ordinary_cnt == len)
|
|
return; /* NUL is already added by o_addblock */
|
|
str += ordinary_cnt;
|
|
len -= ordinary_cnt + 1; /* we are processing + 1 char below */
|
|
|
|
ch = *str++;
|
|
sz = 1;
|
|
if (ch) { /* it is necessarily one of "*?[\\" MAYBE_BRACES */
|
|
sz++;
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o_grow_by(o, sz);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
}
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addQblock(o_string *o, const char *str, int len)
|
|
{
|
|
if (!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)) {
|
|
o_addblock(o, str, len);
|
|
return;
|
|
}
|
|
o_addqblock(o, str, len);
|
|
}
|
|
|
|
static void o_addQstr(o_string *o, const char *str)
|
|
{
|
|
o_addQblock(o, str, strlen(str));
|
|
}
|
|
|
|
/* A special kind of o_string for $VAR and `cmd` expansion.
|
|
* It contains char* list[] at the beginning, which is grown in 16 element
|
|
* increments. Actual string data starts at the next multiple of 16 * (char*).
|
|
* list[i] contains an INDEX (int!) into this string data.
|
|
* It means that if list[] needs to grow, data needs to be moved higher up
|
|
* but list[i]'s need not be modified.
|
|
* NB: remembering how many list[i]'s you have there is crucial.
|
|
* o_finalize_list() operation post-processes this structure - calculates
|
|
* and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
|
|
*/
|
|
#if DEBUG_EXPAND || DEBUG_GLOB
|
|
static void debug_print_list(const char *prefix, o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
int i = 0;
|
|
|
|
indent();
|
|
fdprintf(2, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d glob:%d quoted:%d escape:%d\n",
|
|
prefix, list, n, string_start, o->length, o->maxlen,
|
|
!!(o->o_expflags & EXP_FLAG_GLOB),
|
|
o->has_quoted_part,
|
|
!!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
|
while (i < n) {
|
|
indent();
|
|
fdprintf(2, " list[%d]=%d '%s' %p\n", i, (int)(uintptr_t)list[i],
|
|
o->data + (int)(uintptr_t)list[i] + string_start,
|
|
o->data + (int)(uintptr_t)list[i] + string_start);
|
|
i++;
|
|
}
|
|
if (n) {
|
|
const char *p = o->data + (int)(uintptr_t)list[n - 1] + string_start;
|
|
indent();
|
|
fdprintf(2, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
|
|
}
|
|
}
|
|
#else
|
|
# define debug_print_list(prefix, o, n) ((void)0)
|
|
#endif
|
|
|
|
/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
|
|
* in list[n] so that it points past last stored byte so far.
|
|
* It returns n+1. */
|
|
static int o_save_ptr_helper(o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start;
|
|
int string_len;
|
|
|
|
if (!o->has_empty_slot) {
|
|
string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
string_len = o->length - string_start;
|
|
if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
|
|
debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
|
|
/* list[n] points to string_start, make space for 16 more pointers */
|
|
o->maxlen += 0x10 * sizeof(list[0]);
|
|
o->data = xrealloc(o->data, o->maxlen + 1);
|
|
list = (char**)o->data;
|
|
memmove(list + n + 0x10, list + n, string_len);
|
|
o->length += 0x10 * sizeof(list[0]);
|
|
} else {
|
|
debug_printf_list("list[%d]=%d string_start=%d\n",
|
|
n, string_len, string_start);
|
|
}
|
|
} else {
|
|
/* We have empty slot at list[n], reuse without growth */
|
|
string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
|
|
string_len = o->length - string_start;
|
|
debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
|
|
n, string_len, string_start);
|
|
o->has_empty_slot = 0;
|
|
}
|
|
o->has_quoted_part = 0;
|
|
list[n] = (char*)(uintptr_t)string_len;
|
|
return n + 1;
|
|
}
|
|
|
|
/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
|
|
static int o_get_last_ptr(o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
|
|
return ((int)(uintptr_t)list[n-1]) + string_start;
|
|
}
|
|
|
|
#if ENABLE_HUSH_BRACE_EXPANSION
|
|
/* There in a GNU extension, GLOB_BRACE, but it is not usable:
|
|
* first, it processes even {a} (no commas), second,
|
|
* I didn't manage to make it return strings when they don't match
|
|
* existing files. Need to re-implement it.
|
|
*/
|
|
|
|
/* Helper */
|
|
static int glob_needed(const char *s)
|
|
{
|
|
while (*s) {
|
|
if (*s == '\\') {
|
|
if (!s[1])
|
|
return 0;
|
|
s += 2;
|
|
continue;
|
|
}
|
|
if (*s == '*' || *s == '[' || *s == '?' || *s == '{')
|
|
return 1;
|
|
s++;
|
|
}
|
|
return 0;
|
|
}
|
|
/* Return pointer to next closing brace or to comma */
|
|
static const char *next_brace_sub(const char *cp)
|
|
{
|
|
unsigned depth = 0;
|
|
cp++;
|
|
while (*cp != '\0') {
|
|
if (*cp == '\\') {
|
|
if (*++cp == '\0')
|
|
break;
|
|
cp++;
|
|
continue;
|
|
}
|
|
if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0))
|
|
break;
|
|
if (*cp++ == '{')
|
|
depth++;
|
|
}
|
|
|
|
return *cp != '\0' ? cp : NULL;
|
|
}
|
|
/* Recursive brace globber. Note: may garble pattern[]. */
|
|
static int glob_brace(char *pattern, o_string *o, int n)
|
|
{
|
|
char *new_pattern_buf;
|
|
const char *begin;
|
|
const char *next;
|
|
const char *rest;
|
|
const char *p;
|
|
size_t rest_len;
|
|
|
|
debug_printf_glob("glob_brace('%s')\n", pattern);
|
|
|
|
begin = pattern;
|
|
while (1) {
|
|
if (*begin == '\0')
|
|
goto simple_glob;
|
|
if (*begin == '{') {
|
|
/* Find the first sub-pattern and at the same time
|
|
* find the rest after the closing brace */
|
|
next = next_brace_sub(begin);
|
|
if (next == NULL) {
|
|
/* An illegal expression */
|
|
goto simple_glob;
|
|
}
|
|
if (*next == '}') {
|
|
/* "{abc}" with no commas - illegal
|
|
* brace expr, disregard and skip it */
|
|
begin = next + 1;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (*begin == '\\' && begin[1] != '\0')
|
|
begin++;
|
|
begin++;
|
|
}
|
|
debug_printf_glob("begin:%s\n", begin);
|
|
debug_printf_glob("next:%s\n", next);
|
|
|
|
/* Now find the end of the whole brace expression */
|
|
rest = next;
|
|
while (*rest != '}') {
|
|
rest = next_brace_sub(rest);
|
|
if (rest == NULL) {
|
|
/* An illegal expression */
|
|
goto simple_glob;
|
|
}
|
|
debug_printf_glob("rest:%s\n", rest);
|
|
}
|
|
rest_len = strlen(++rest) + 1;
|
|
|
|
/* We are sure the brace expression is well-formed */
|
|
|
|
/* Allocate working buffer large enough for our work */
|
|
new_pattern_buf = xmalloc(strlen(pattern));
|
|
|
|
/* We have a brace expression. BEGIN points to the opening {,
|
|
* NEXT points past the terminator of the first element, and REST
|
|
* points past the final }. We will accumulate result names from
|
|
* recursive runs for each brace alternative in the buffer using
|
|
* GLOB_APPEND. */
|
|
|
|
p = begin + 1;
|
|
while (1) {
|
|
/* Construct the new glob expression */
|
|
memcpy(
|
|
mempcpy(
|
|
mempcpy(new_pattern_buf,
|
|
/* We know the prefix for all sub-patterns */
|
|
pattern, begin - pattern),
|
|
p, next - p),
|
|
rest, rest_len);
|
|
|
|
/* Note: glob_brace() may garble new_pattern_buf[].
|
|
* That's why we re-copy prefix every time (1st memcpy above).
|
|
*/
|
|
n = glob_brace(new_pattern_buf, o, n);
|
|
if (*next == '}') {
|
|
/* We saw the last entry */
|
|
break;
|
|
}
|
|
p = next + 1;
|
|
next = next_brace_sub(next);
|
|
}
|
|
free(new_pattern_buf);
|
|
return n;
|
|
|
|
simple_glob:
|
|
{
|
|
int gr;
|
|
glob_t globdata;
|
|
|
|
memset(&globdata, 0, sizeof(globdata));
|
|
gr = glob(pattern, 0, NULL, &globdata);
|
|
debug_printf_glob("glob('%s'):%d\n", pattern, gr);
|
|
if (gr != 0) {
|
|
if (gr == GLOB_NOMATCH) {
|
|
globfree(&globdata);
|
|
/* NB: garbles parameter */
|
|
unbackslash(pattern);
|
|
o_addstr_with_NUL(o, pattern);
|
|
debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
if (gr == GLOB_NOSPACE)
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
|
/* GLOB_ABORTED? Only happens with GLOB_ERR flag,
|
|
* but we didn't specify it. Paranoia again. */
|
|
bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
|
|
}
|
|
if (globdata.gl_pathv && globdata.gl_pathv[0]) {
|
|
char **argv = globdata.gl_pathv;
|
|
while (1) {
|
|
o_addstr_with_NUL(o, *argv);
|
|
n = o_save_ptr_helper(o, n);
|
|
argv++;
|
|
if (!*argv)
|
|
break;
|
|
}
|
|
}
|
|
globfree(&globdata);
|
|
}
|
|
return n;
|
|
}
|
|
/* Performs globbing on last list[],
|
|
* saving each result as a new list[].
|
|
*/
|
|
static int perform_glob(o_string *o, int n)
|
|
{
|
|
char *pattern, *copy;
|
|
|
|
debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
|
|
if (!o->data)
|
|
return o_save_ptr_helper(o, n);
|
|
pattern = o->data + o_get_last_ptr(o, n);
|
|
debug_printf_glob("glob pattern '%s'\n", pattern);
|
|
if (!glob_needed(pattern)) {
|
|
/* unbackslash last string in o in place, fix length */
|
|
o->length = unbackslash(pattern) - o->data;
|
|
debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
|
|
copy = xstrdup(pattern);
|
|
/* "forget" pattern in o */
|
|
o->length = pattern - o->data;
|
|
n = glob_brace(copy, o, n);
|
|
free(copy);
|
|
if (DEBUG_GLOB)
|
|
debug_print_list("perform_glob returning", o, n);
|
|
return n;
|
|
}
|
|
|
|
#else /* !HUSH_BRACE_EXPANSION */
|
|
|
|
/* Helper */
|
|
static int glob_needed(const char *s)
|
|
{
|
|
while (*s) {
|
|
if (*s == '\\') {
|
|
if (!s[1])
|
|
return 0;
|
|
s += 2;
|
|
continue;
|
|
}
|
|
if (*s == '*' || *s == '[' || *s == '?')
|
|
return 1;
|
|
s++;
|
|
}
|
|
return 0;
|
|
}
|
|
/* Performs globbing on last list[],
|
|
* saving each result as a new list[].
|
|
*/
|
|
static int perform_glob(o_string *o, int n)
|
|
{
|
|
glob_t globdata;
|
|
int gr;
|
|
char *pattern;
|
|
|
|
debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
|
|
if (!o->data)
|
|
return o_save_ptr_helper(o, n);
|
|
pattern = o->data + o_get_last_ptr(o, n);
|
|
debug_printf_glob("glob pattern '%s'\n", pattern);
|
|
if (!glob_needed(pattern)) {
|
|
literal:
|
|
/* unbackslash last string in o in place, fix length */
|
|
o->length = unbackslash(pattern) - o->data;
|
|
debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
|
|
memset(&globdata, 0, sizeof(globdata));
|
|
/* Can't use GLOB_NOCHECK: it does not unescape the string.
|
|
* If we glob "*.\*" and don't find anything, we need
|
|
* to fall back to using literal "*.*", but GLOB_NOCHECK
|
|
* will return "*.\*"!
|
|
*/
|
|
gr = glob(pattern, 0, NULL, &globdata);
|
|
debug_printf_glob("glob('%s'):%d\n", pattern, gr);
|
|
if (gr != 0) {
|
|
if (gr == GLOB_NOMATCH) {
|
|
globfree(&globdata);
|
|
goto literal;
|
|
}
|
|
if (gr == GLOB_NOSPACE)
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
|
/* GLOB_ABORTED? Only happens with GLOB_ERR flag,
|
|
* but we didn't specify it. Paranoia again. */
|
|
bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
|
|
}
|
|
if (globdata.gl_pathv && globdata.gl_pathv[0]) {
|
|
char **argv = globdata.gl_pathv;
|
|
/* "forget" pattern in o */
|
|
o->length = pattern - o->data;
|
|
while (1) {
|
|
o_addstr_with_NUL(o, *argv);
|
|
n = o_save_ptr_helper(o, n);
|
|
argv++;
|
|
if (!*argv)
|
|
break;
|
|
}
|
|
}
|
|
globfree(&globdata);
|
|
if (DEBUG_GLOB)
|
|
debug_print_list("perform_glob returning", o, n);
|
|
return n;
|
|
}
|
|
|
|
#endif /* !HUSH_BRACE_EXPANSION */
|
|
|
|
/* If o->o_expflags & EXP_FLAG_GLOB, glob the string so far remembered.
|
|
* Otherwise, just finish current list[] and start new */
|
|
static int o_save_ptr(o_string *o, int n)
|
|
{
|
|
if (o->o_expflags & EXP_FLAG_GLOB) {
|
|
/* If o->has_empty_slot, list[n] was already globbed
|
|
* (if it was requested back then when it was filled)
|
|
* so don't do that again! */
|
|
if (!o->has_empty_slot)
|
|
return perform_glob(o, n); /* o_save_ptr_helper is inside */
|
|
}
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
|
|
/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
|
|
static char **o_finalize_list(o_string *o, int n)
|
|
{
|
|
char **list;
|
|
int string_start;
|
|
|
|
n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
|
|
if (DEBUG_EXPAND)
|
|
debug_print_list("finalized", o, n);
|
|
debug_printf_expand("finalized n:%d\n", n);
|
|
list = (char**)o->data;
|
|
string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
list[--n] = NULL;
|
|
while (n) {
|
|
n--;
|
|
list[n] = o->data + (int)(uintptr_t)list[n] + string_start;
|
|
}
|
|
return list;
|
|
}
|
|
|
|
static void free_pipe_list(struct pipe *pi);
|
|
|
|
/* Returns pi->next - next pipe in the list */
|
|
static struct pipe *free_pipe(struct pipe *pi)
|
|
{
|
|
struct pipe *next;
|
|
int i;
|
|
|
|
debug_printf_clean("free_pipe (pid %d)\n", getpid());
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
struct command *command;
|
|
struct redir_struct *r, *rnext;
|
|
|
|
command = &pi->cmds[i];
|
|
debug_printf_clean(" command %d:\n", i);
|
|
if (command->argv) {
|
|
if (DEBUG_CLEAN) {
|
|
int a;
|
|
char **p;
|
|
for (a = 0, p = command->argv; *p; a++, p++) {
|
|
debug_printf_clean(" argv[%d] = %s\n", a, *p);
|
|
}
|
|
}
|
|
free_strings(command->argv);
|
|
//command->argv = NULL;
|
|
}
|
|
/* not "else if": on syntax error, we may have both! */
|
|
if (command->group) {
|
|
debug_printf_clean(" begin group (cmd_type:%d)\n",
|
|
command->cmd_type);
|
|
free_pipe_list(command->group);
|
|
debug_printf_clean(" end group\n");
|
|
//command->group = NULL;
|
|
}
|
|
/* else is crucial here.
|
|
* If group != NULL, child_func is meaningless */
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else if (command->child_func) {
|
|
debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
|
|
command->child_func->parent_cmd = NULL;
|
|
}
|
|
#endif
|
|
#if !BB_MMU
|
|
free(command->group_as_string);
|
|
//command->group_as_string = NULL;
|
|
#endif
|
|
for (r = command->redirects; r; r = rnext) {
|
|
debug_printf_clean(" redirect %d%s",
|
|
r->rd_fd, redir_table[r->rd_type].descrip);
|
|
/* guard against the case >$FOO, where foo is unset or blank */
|
|
if (r->rd_filename) {
|
|
debug_printf_clean(" fname:'%s'\n", r->rd_filename);
|
|
free(r->rd_filename);
|
|
//r->rd_filename = NULL;
|
|
}
|
|
debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
|
|
rnext = r->next;
|
|
free(r);
|
|
}
|
|
//command->redirects = NULL;
|
|
}
|
|
free(pi->cmds); /* children are an array, they get freed all at once */
|
|
//pi->cmds = NULL;
|
|
#if ENABLE_HUSH_JOB
|
|
free(pi->cmdtext);
|
|
//pi->cmdtext = NULL;
|
|
#endif
|
|
|
|
next = pi->next;
|
|
free(pi);
|
|
return next;
|
|
}
|
|
|
|
static void free_pipe_list(struct pipe *pi)
|
|
{
|
|
while (pi) {
|
|
#if HAS_KEYWORDS
|
|
debug_printf_clean("pipe reserved word %d\n", pi->res_word);
|
|
#endif
|
|
debug_printf_clean("pipe followup code %d\n", pi->followup);
|
|
pi = free_pipe(pi);
|
|
}
|
|
}
|
|
|
|
|
|
/*** Parsing routines ***/
|
|
|
|
#ifndef debug_print_tree
|
|
static void debug_print_tree(struct pipe *pi, int lvl)
|
|
{
|
|
static const char *const PIPE[] = {
|
|
[PIPE_SEQ] = "SEQ",
|
|
[PIPE_AND] = "AND",
|
|
[PIPE_OR ] = "OR" ,
|
|
[PIPE_BG ] = "BG" ,
|
|
};
|
|
static const char *RES[] = {
|
|
[RES_NONE ] = "NONE" ,
|
|
# if ENABLE_HUSH_IF
|
|
[RES_IF ] = "IF" ,
|
|
[RES_THEN ] = "THEN" ,
|
|
[RES_ELIF ] = "ELIF" ,
|
|
[RES_ELSE ] = "ELSE" ,
|
|
[RES_FI ] = "FI" ,
|
|
# endif
|
|
# if ENABLE_HUSH_LOOPS
|
|
[RES_FOR ] = "FOR" ,
|
|
[RES_WHILE] = "WHILE",
|
|
[RES_UNTIL] = "UNTIL",
|
|
[RES_DO ] = "DO" ,
|
|
[RES_DONE ] = "DONE" ,
|
|
# endif
|
|
# if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
[RES_IN ] = "IN" ,
|
|
# endif
|
|
# if ENABLE_HUSH_CASE
|
|
[RES_CASE ] = "CASE" ,
|
|
[RES_CASE_IN ] = "CASE_IN" ,
|
|
[RES_MATCH] = "MATCH",
|
|
[RES_CASE_BODY] = "CASE_BODY",
|
|
[RES_ESAC ] = "ESAC" ,
|
|
# endif
|
|
[RES_XXXX ] = "XXXX" ,
|
|
[RES_SNTX ] = "SNTX" ,
|
|
};
|
|
static const char *const CMDTYPE[] = {
|
|
"{}",
|
|
"()",
|
|
"[noglob]",
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
"func()",
|
|
# endif
|
|
};
|
|
|
|
int pin, prn;
|
|
|
|
pin = 0;
|
|
while (pi) {
|
|
fdprintf(2, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
|
|
pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
|
|
prn = 0;
|
|
while (prn < pi->num_cmds) {
|
|
struct command *command = &pi->cmds[prn];
|
|
char **argv = command->argv;
|
|
|
|
fdprintf(2, "%*s cmd %d assignment_cnt:%d",
|
|
lvl*2, "", prn,
|
|
command->assignment_cnt);
|
|
if (command->group) {
|
|
fdprintf(2, " group %s: (argv=%p)%s%s\n",
|
|
CMDTYPE[command->cmd_type],
|
|
argv
|
|
# if !BB_MMU
|
|
, " group_as_string:", command->group_as_string
|
|
# else
|
|
, "", ""
|
|
# endif
|
|
);
|
|
debug_print_tree(command->group, lvl+1);
|
|
prn++;
|
|
continue;
|
|
}
|
|
if (argv) while (*argv) {
|
|
fdprintf(2, " '%s'", *argv);
|
|
argv++;
|
|
}
|
|
fdprintf(2, "\n");
|
|
prn++;
|
|
}
|
|
pi = pi->next;
|
|
pin++;
|
|
}
|
|
}
|
|
#endif /* debug_print_tree */
|
|
|
|
static struct pipe *new_pipe(void)
|
|
{
|
|
struct pipe *pi;
|
|
pi = xzalloc(sizeof(struct pipe));
|
|
/*pi->followup = 0; - deliberately invalid value */
|
|
/*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
|
|
return pi;
|
|
}
|
|
|
|
/* Command (member of a pipe) is complete, or we start a new pipe
|
|
* if ctx->command is NULL.
|
|
* No errors possible here.
|
|
*/
|
|
static int done_command(struct parse_context *ctx)
|
|
{
|
|
/* The command is really already in the pipe structure, so
|
|
* advance the pipe counter and make a new, null command. */
|
|
struct pipe *pi = ctx->pipe;
|
|
struct command *command = ctx->command;
|
|
|
|
if (command) {
|
|
if (IS_NULL_CMD(command)) {
|
|
debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
|
|
goto clear_and_ret;
|
|
}
|
|
pi->num_cmds++;
|
|
debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
|
|
//debug_print_tree(ctx->list_head, 20);
|
|
} else {
|
|
debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
|
|
}
|
|
|
|
/* Only real trickiness here is that the uncommitted
|
|
* command structure is not counted in pi->num_cmds. */
|
|
pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
|
|
ctx->command = command = &pi->cmds[pi->num_cmds];
|
|
clear_and_ret:
|
|
memset(command, 0, sizeof(*command));
|
|
return pi->num_cmds; /* used only for 0/nonzero check */
|
|
}
|
|
|
|
static void done_pipe(struct parse_context *ctx, pipe_style type)
|
|
{
|
|
int not_null;
|
|
|
|
debug_printf_parse("done_pipe entered, followup %d\n", type);
|
|
/* Close previous command */
|
|
not_null = done_command(ctx);
|
|
ctx->pipe->followup = type;
|
|
#if HAS_KEYWORDS
|
|
ctx->pipe->pi_inverted = ctx->ctx_inverted;
|
|
ctx->ctx_inverted = 0;
|
|
ctx->pipe->res_word = ctx->ctx_res_w;
|
|
#endif
|
|
|
|
/* Without this check, even just <enter> on command line generates
|
|
* tree of three NOPs (!). Which is harmless but annoying.
|
|
* IOW: it is safe to do it unconditionally. */
|
|
if (not_null
|
|
#if ENABLE_HUSH_IF
|
|
|| ctx->ctx_res_w == RES_FI
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
|| ctx->ctx_res_w == RES_DONE
|
|
|| ctx->ctx_res_w == RES_FOR
|
|
|| ctx->ctx_res_w == RES_IN
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
|| ctx->ctx_res_w == RES_ESAC
|
|
#endif
|
|
) {
|
|
struct pipe *new_p;
|
|
debug_printf_parse("done_pipe: adding new pipe: "
|
|
"not_null:%d ctx->ctx_res_w:%d\n",
|
|
not_null, ctx->ctx_res_w);
|
|
new_p = new_pipe();
|
|
ctx->pipe->next = new_p;
|
|
ctx->pipe = new_p;
|
|
/* RES_THEN, RES_DO etc are "sticky" -
|
|
* they remain set for pipes inside if/while.
|
|
* This is used to control execution.
|
|
* RES_FOR and RES_IN are NOT sticky (needed to support
|
|
* cases where variable or value happens to match a keyword):
|
|
*/
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (ctx->ctx_res_w == RES_FOR
|
|
|| ctx->ctx_res_w == RES_IN)
|
|
ctx->ctx_res_w = RES_NONE;
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx->ctx_res_w == RES_MATCH)
|
|
ctx->ctx_res_w = RES_CASE_BODY;
|
|
if (ctx->ctx_res_w == RES_CASE)
|
|
ctx->ctx_res_w = RES_CASE_IN;
|
|
#endif
|
|
ctx->command = NULL; /* trick done_command below */
|
|
/* Create the memory for command, roughly:
|
|
* ctx->pipe->cmds = new struct command;
|
|
* ctx->command = &ctx->pipe->cmds[0];
|
|
*/
|
|
done_command(ctx);
|
|
//debug_print_tree(ctx->list_head, 10);
|
|
}
|
|
debug_printf_parse("done_pipe return\n");
|
|
}
|
|
|
|
static void initialize_context(struct parse_context *ctx)
|
|
{
|
|
memset(ctx, 0, sizeof(*ctx));
|
|
ctx->pipe = ctx->list_head = new_pipe();
|
|
/* Create the memory for command, roughly:
|
|
* ctx->pipe->cmds = new struct command;
|
|
* ctx->command = &ctx->pipe->cmds[0];
|
|
*/
|
|
done_command(ctx);
|
|
}
|
|
|
|
/* If a reserved word is found and processed, parse context is modified
|
|
* and 1 is returned.
|
|
*/
|
|
#if HAS_KEYWORDS
|
|
struct reserved_combo {
|
|
char literal[6];
|
|
unsigned char res;
|
|
unsigned char assignment_flag;
|
|
int flag;
|
|
};
|
|
enum {
|
|
FLAG_END = (1 << RES_NONE ),
|
|
# if ENABLE_HUSH_IF
|
|
FLAG_IF = (1 << RES_IF ),
|
|
FLAG_THEN = (1 << RES_THEN ),
|
|
FLAG_ELIF = (1 << RES_ELIF ),
|
|
FLAG_ELSE = (1 << RES_ELSE ),
|
|
FLAG_FI = (1 << RES_FI ),
|
|
# endif
|
|
# if ENABLE_HUSH_LOOPS
|
|
FLAG_FOR = (1 << RES_FOR ),
|
|
FLAG_WHILE = (1 << RES_WHILE),
|
|
FLAG_UNTIL = (1 << RES_UNTIL),
|
|
FLAG_DO = (1 << RES_DO ),
|
|
FLAG_DONE = (1 << RES_DONE ),
|
|
FLAG_IN = (1 << RES_IN ),
|
|
# endif
|
|
# if ENABLE_HUSH_CASE
|
|
FLAG_MATCH = (1 << RES_MATCH),
|
|
FLAG_ESAC = (1 << RES_ESAC ),
|
|
# endif
|
|
FLAG_START = (1 << RES_XXXX ),
|
|
};
|
|
|
|
static const struct reserved_combo* match_reserved_word(o_string *word)
|
|
{
|
|
/* Mostly a list of accepted follow-up reserved words.
|
|
* FLAG_END means we are done with the sequence, and are ready
|
|
* to turn the compound list into a command.
|
|
* FLAG_START means the word must start a new compound list.
|
|
*/
|
|
static const struct reserved_combo reserved_list[] = {
|
|
# if ENABLE_HUSH_IF
|
|
{ "!", RES_NONE, NOT_ASSIGNMENT , 0 },
|
|
{ "if", RES_IF, MAYBE_ASSIGNMENT, FLAG_THEN | FLAG_START },
|
|
{ "then", RES_THEN, MAYBE_ASSIGNMENT, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
|
|
{ "elif", RES_ELIF, MAYBE_ASSIGNMENT, FLAG_THEN },
|
|
{ "else", RES_ELSE, MAYBE_ASSIGNMENT, FLAG_FI },
|
|
{ "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
|
|
# endif
|
|
# if ENABLE_HUSH_LOOPS
|
|
{ "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
|
|
{ "while", RES_WHILE, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
|
|
{ "until", RES_UNTIL, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
|
|
{ "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
|
|
{ "do", RES_DO, MAYBE_ASSIGNMENT, FLAG_DONE },
|
|
{ "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
|
|
# endif
|
|
# if ENABLE_HUSH_CASE
|
|
{ "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
|
|
{ "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
|
|
# endif
|
|
};
|
|
const struct reserved_combo *r;
|
|
|
|
for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
|
|
if (strcmp(word->data, r->literal) == 0)
|
|
return r;
|
|
}
|
|
return NULL;
|
|
}
|
|
/* Return 0: not a keyword, 1: keyword
|
|
*/
|
|
static int reserved_word(o_string *word, struct parse_context *ctx)
|
|
{
|
|
# if ENABLE_HUSH_CASE
|
|
static const struct reserved_combo reserved_match = {
|
|
"", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
|
|
};
|
|
# endif
|
|
const struct reserved_combo *r;
|
|
|
|
if (word->has_quoted_part)
|
|
return 0;
|
|
r = match_reserved_word(word);
|
|
if (!r)
|
|
return 0;
|
|
|
|
debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
|
|
# if ENABLE_HUSH_CASE
|
|
if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
|
|
/* "case word IN ..." - IN part starts first MATCH part */
|
|
r = &reserved_match;
|
|
} else
|
|
# endif
|
|
if (r->flag == 0) { /* '!' */
|
|
if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
|
|
syntax_error("! ! command");
|
|
ctx->ctx_res_w = RES_SNTX;
|
|
}
|
|
ctx->ctx_inverted = 1;
|
|
return 1;
|
|
}
|
|
if (r->flag & FLAG_START) {
|
|
struct parse_context *old;
|
|
|
|
old = xmalloc(sizeof(*old));
|
|
debug_printf_parse("push stack %p\n", old);
|
|
*old = *ctx; /* physical copy */
|
|
initialize_context(ctx);
|
|
ctx->stack = old;
|
|
} else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
|
|
syntax_error_at(word->data);
|
|
ctx->ctx_res_w = RES_SNTX;
|
|
return 1;
|
|
} else {
|
|
/* "{...} fi" is ok. "{...} if" is not
|
|
* Example:
|
|
* if { echo foo; } then { echo bar; } fi */
|
|
if (ctx->command->group)
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
|
|
ctx->ctx_res_w = r->res;
|
|
ctx->old_flag = r->flag;
|
|
word->o_assignment = r->assignment_flag;
|
|
debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
|
|
|
|
if (ctx->old_flag & FLAG_END) {
|
|
struct parse_context *old;
|
|
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
debug_printf_parse("pop stack %p\n", ctx->stack);
|
|
old = ctx->stack;
|
|
old->command->group = ctx->list_head;
|
|
old->command->cmd_type = CMD_NORMAL;
|
|
# if !BB_MMU
|
|
o_addstr(&old->as_string, ctx->as_string.data);
|
|
o_free_unsafe(&ctx->as_string);
|
|
old->command->group_as_string = xstrdup(old->as_string.data);
|
|
debug_printf_parse("pop, remembering as:'%s'\n",
|
|
old->command->group_as_string);
|
|
# endif
|
|
*ctx = *old; /* physical copy */
|
|
free(old);
|
|
}
|
|
return 1;
|
|
}
|
|
#endif /* HAS_KEYWORDS */
|
|
|
|
/* Word is complete, look at it and update parsing context.
|
|
* Normal return is 0. Syntax errors return 1.
|
|
* Note: on return, word is reset, but not o_free'd!
|
|
*/
|
|
static int done_word(o_string *word, struct parse_context *ctx)
|
|
{
|
|
struct command *command = ctx->command;
|
|
|
|
debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
|
|
if (word->length == 0 && !word->has_quoted_part) {
|
|
debug_printf_parse("done_word return 0: true null, ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->pending_redirect) {
|
|
/* We do not glob in e.g. >*.tmp case. bash seems to glob here
|
|
* only if run as "bash", not "sh" */
|
|
/* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
|
* "2.7 Redirection
|
|
* ...the word that follows the redirection operator
|
|
* shall be subjected to tilde expansion, parameter expansion,
|
|
* command substitution, arithmetic expansion, and quote
|
|
* removal. Pathname expansion shall not be performed
|
|
* on the word by a non-interactive shell; an interactive
|
|
* shell may perform it, but shall do so only when
|
|
* the expansion would result in one word."
|
|
*/
|
|
ctx->pending_redirect->rd_filename = xstrdup(word->data);
|
|
/* Cater for >\file case:
|
|
* >\a creates file a; >\\a, >"\a", >"\\a" create file \a
|
|
* Same with heredocs:
|
|
* for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
|
|
*/
|
|
if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
|
|
unbackslash(ctx->pending_redirect->rd_filename);
|
|
/* Is it <<"HEREDOC"? */
|
|
if (word->has_quoted_part) {
|
|
ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
|
|
}
|
|
}
|
|
debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
|
|
ctx->pending_redirect = NULL;
|
|
} else {
|
|
#if HAS_KEYWORDS
|
|
# if ENABLE_HUSH_CASE
|
|
if (ctx->ctx_dsemicolon
|
|
&& strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
|
|
) {
|
|
/* already done when ctx_dsemicolon was set to 1: */
|
|
/* ctx->ctx_res_w = RES_MATCH; */
|
|
ctx->ctx_dsemicolon = 0;
|
|
} else
|
|
# endif
|
|
if (!command->argv /* if it's the first word... */
|
|
# if ENABLE_HUSH_LOOPS
|
|
&& ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
|
|
&& ctx->ctx_res_w != RES_IN
|
|
# endif
|
|
# if ENABLE_HUSH_CASE
|
|
&& ctx->ctx_res_w != RES_CASE
|
|
# endif
|
|
) {
|
|
int reserved = reserved_word(word, ctx);
|
|
debug_printf_parse("checking for reserved-ness: %d\n", reserved);
|
|
if (reserved) {
|
|
o_reset_to_empty_unquoted(word);
|
|
debug_printf_parse("done_word return %d\n",
|
|
(ctx->ctx_res_w == RES_SNTX));
|
|
return (ctx->ctx_res_w == RES_SNTX);
|
|
}
|
|
# if ENABLE_HUSH_BASH_COMPAT
|
|
if (strcmp(word->data, "[[") == 0) {
|
|
command->cmd_type = CMD_SINGLEWORD_NOGLOB;
|
|
}
|
|
/* fall through */
|
|
# endif
|
|
}
|
|
#endif
|
|
if (command->group) {
|
|
/* "{ echo foo; } echo bar" - bad */
|
|
syntax_error_at(word->data);
|
|
debug_printf_parse("done_word return 1: syntax error, "
|
|
"groups and arglists don't mix\n");
|
|
return 1;
|
|
}
|
|
|
|
/* If this word wasn't an assignment, next ones definitely
|
|
* can't be assignments. Even if they look like ones. */
|
|
if (word->o_assignment != DEFINITELY_ASSIGNMENT
|
|
&& word->o_assignment != WORD_IS_KEYWORD
|
|
) {
|
|
word->o_assignment = NOT_ASSIGNMENT;
|
|
} else {
|
|
if (word->o_assignment == DEFINITELY_ASSIGNMENT) {
|
|
command->assignment_cnt++;
|
|
debug_printf_parse("++assignment_cnt=%d\n", command->assignment_cnt);
|
|
}
|
|
debug_printf_parse("word->o_assignment was:'%s'\n", assignment_flag[word->o_assignment]);
|
|
word->o_assignment = MAYBE_ASSIGNMENT;
|
|
}
|
|
debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
|
|
|
|
if (word->has_quoted_part
|
|
/* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
|
|
&& (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
|
|
/* (otherwise it's known to be not empty and is already safe) */
|
|
) {
|
|
/* exclude "$@" - it can expand to no word despite "" */
|
|
char *p = word->data;
|
|
while (p[0] == SPECIAL_VAR_SYMBOL
|
|
&& (p[1] & 0x7f) == '@'
|
|
&& p[2] == SPECIAL_VAR_SYMBOL
|
|
) {
|
|
p += 3;
|
|
}
|
|
}
|
|
command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
|
|
debug_print_strings("word appended to argv", command->argv);
|
|
}
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (ctx->ctx_res_w == RES_FOR) {
|
|
if (word->has_quoted_part
|
|
|| !is_well_formed_var_name(command->argv[0], '\0')
|
|
) {
|
|
/* bash says just "not a valid identifier" */
|
|
syntax_error("not a valid identifier in for");
|
|
return 1;
|
|
}
|
|
/* Force FOR to have just one word (variable name) */
|
|
/* NB: basically, this makes hush see "for v in ..."
|
|
* syntax as if it is "for v; in ...". FOR and IN become
|
|
* two pipe structs in parse tree. */
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
/* Force CASE to have just one word */
|
|
if (ctx->ctx_res_w == RES_CASE) {
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
#endif
|
|
|
|
o_reset_to_empty_unquoted(word);
|
|
|
|
debug_printf_parse("done_word return 0\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Peek ahead in the input to find out if we have a "&n" construct,
|
|
* as in "2>&1", that represents duplicating a file descriptor.
|
|
* Return:
|
|
* REDIRFD_CLOSE if >&- "close fd" construct is seen,
|
|
* REDIRFD_SYNTAX_ERR if syntax error,
|
|
* REDIRFD_TO_FILE if no & was seen,
|
|
* or the number found.
|
|
*/
|
|
#if BB_MMU
|
|
#define parse_redir_right_fd(as_string, input) \
|
|
parse_redir_right_fd(input)
|
|
#endif
|
|
static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
|
|
{
|
|
int ch, d, ok;
|
|
|
|
ch = i_peek(input);
|
|
if (ch != '&')
|
|
return REDIRFD_TO_FILE;
|
|
|
|
ch = i_getch(input); /* get the & */
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
if (ch == '-') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
return REDIRFD_CLOSE;
|
|
}
|
|
d = 0;
|
|
ok = 0;
|
|
while (ch != EOF && isdigit(ch)) {
|
|
d = d*10 + (ch-'0');
|
|
ok = 1;
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
}
|
|
if (ok) return d;
|
|
|
|
//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
|
|
|
|
bb_error_msg("ambiguous redirect");
|
|
return REDIRFD_SYNTAX_ERR;
|
|
}
|
|
|
|
/* Return code is 0 normal, 1 if a syntax error is detected
|
|
*/
|
|
static int parse_redirect(struct parse_context *ctx,
|
|
int fd,
|
|
redir_type style,
|
|
struct in_str *input)
|
|
{
|
|
struct command *command = ctx->command;
|
|
struct redir_struct *redir;
|
|
struct redir_struct **redirp;
|
|
int dup_num;
|
|
|
|
dup_num = REDIRFD_TO_FILE;
|
|
if (style != REDIRECT_HEREDOC) {
|
|
/* Check for a '>&1' type redirect */
|
|
dup_num = parse_redir_right_fd(&ctx->as_string, input);
|
|
if (dup_num == REDIRFD_SYNTAX_ERR)
|
|
return 1;
|
|
} else {
|
|
int ch = i_peek(input);
|
|
dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
|
|
if (dup_num) { /* <<-... */
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
ch = i_peek(input);
|
|
}
|
|
}
|
|
|
|
if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
|
|
int ch = i_peek(input);
|
|
if (ch == '|') {
|
|
/* >|FILE redirect ("clobbering" >).
|
|
* Since we do not support "set -o noclobber" yet,
|
|
* >| and > are the same for now. Just eat |.
|
|
*/
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
}
|
|
}
|
|
|
|
/* Create a new redir_struct and append it to the linked list */
|
|
redirp = &command->redirects;
|
|
while ((redir = *redirp) != NULL) {
|
|
redirp = &(redir->next);
|
|
}
|
|
*redirp = redir = xzalloc(sizeof(*redir));
|
|
/* redir->next = NULL; */
|
|
/* redir->rd_filename = NULL; */
|
|
redir->rd_type = style;
|
|
redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
|
|
|
|
debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
|
|
redir_table[style].descrip);
|
|
|
|
redir->rd_dup = dup_num;
|
|
if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
|
|
/* Erik had a check here that the file descriptor in question
|
|
* is legit; I postpone that to "run time"
|
|
* A "-" representation of "close me" shows up as a -3 here */
|
|
debug_printf_parse("duplicating redirect '%d>&%d'\n",
|
|
redir->rd_fd, redir->rd_dup);
|
|
} else {
|
|
/* Set ctx->pending_redirect, so we know what to do at the
|
|
* end of the next parsed word. */
|
|
ctx->pending_redirect = redir;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* If a redirect is immediately preceded by a number, that number is
|
|
* supposed to tell which file descriptor to redirect. This routine
|
|
* looks for such preceding numbers. In an ideal world this routine
|
|
* needs to handle all the following classes of redirects...
|
|
* echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
|
|
* echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
|
|
* echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
|
|
* echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
|
|
*
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
|
* "2.7 Redirection
|
|
* ... If n is quoted, the number shall not be recognized as part of
|
|
* the redirection expression. For example:
|
|
* echo \2>a
|
|
* writes the character 2 into file a"
|
|
* We are getting it right by setting ->has_quoted_part on any \<char>
|
|
*
|
|
* A -1 return means no valid number was found,
|
|
* the caller should use the appropriate default for this redirection.
|
|
*/
|
|
static int redirect_opt_num(o_string *o)
|
|
{
|
|
int num;
|
|
|
|
if (o->data == NULL)
|
|
return -1;
|
|
num = bb_strtou(o->data, NULL, 10);
|
|
if (errno || num < 0)
|
|
return -1;
|
|
o_reset_to_empty_unquoted(o);
|
|
return num;
|
|
}
|
|
|
|
#if BB_MMU
|
|
#define fetch_till_str(as_string, input, word, skip_tabs) \
|
|
fetch_till_str(input, word, skip_tabs)
|
|
#endif
|
|
static char *fetch_till_str(o_string *as_string,
|
|
struct in_str *input,
|
|
const char *word,
|
|
int heredoc_flags)
|
|
{
|
|
o_string heredoc = NULL_O_STRING;
|
|
unsigned past_EOL;
|
|
int prev = 0; /* not \ */
|
|
int ch;
|
|
|
|
goto jump_in;
|
|
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
if (ch != EOF)
|
|
nommu_addchr(as_string, ch);
|
|
if ((ch == '\n' || ch == EOF)
|
|
&& ((heredoc_flags & HEREDOC_QUOTED) || prev != '\\')
|
|
) {
|
|
if (strcmp(heredoc.data + past_EOL, word) == 0) {
|
|
heredoc.data[past_EOL] = '\0';
|
|
debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
|
|
return heredoc.data;
|
|
}
|
|
while (ch == '\n') {
|
|
o_addchr(&heredoc, ch);
|
|
prev = ch;
|
|
jump_in:
|
|
past_EOL = heredoc.length;
|
|
do {
|
|
ch = i_getch(input);
|
|
if (ch != EOF)
|
|
nommu_addchr(as_string, ch);
|
|
} while ((heredoc_flags & HEREDOC_SKIPTABS) && ch == '\t');
|
|
}
|
|
}
|
|
if (ch == EOF) {
|
|
o_free_unsafe(&heredoc);
|
|
return NULL;
|
|
}
|
|
o_addchr(&heredoc, ch);
|
|
nommu_addchr(as_string, ch);
|
|
if (prev == '\\' && ch == '\\')
|
|
/* Correctly handle foo\\<eol> (not a line cont.) */
|
|
prev = 0; /* not \ */
|
|
else
|
|
prev = ch;
|
|
}
|
|
}
|
|
|
|
/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
|
|
* and load them all. There should be exactly heredoc_cnt of them.
|
|
*/
|
|
static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
|
|
{
|
|
struct pipe *pi = ctx->list_head;
|
|
|
|
while (pi && heredoc_cnt) {
|
|
int i;
|
|
struct command *cmd = pi->cmds;
|
|
|
|
debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
|
|
pi->num_cmds,
|
|
cmd->argv ? cmd->argv[0] : "NONE");
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
struct redir_struct *redir = cmd->redirects;
|
|
|
|
debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
|
|
i, cmd->argv ? cmd->argv[0] : "NONE");
|
|
while (redir) {
|
|
if (redir->rd_type == REDIRECT_HEREDOC) {
|
|
char *p;
|
|
|
|
redir->rd_type = REDIRECT_HEREDOC2;
|
|
/* redir->rd_dup is (ab)used to indicate <<- */
|
|
p = fetch_till_str(&ctx->as_string, input,
|
|
redir->rd_filename, redir->rd_dup);
|
|
if (!p) {
|
|
syntax_error("unexpected EOF in here document");
|
|
return 1;
|
|
}
|
|
free(redir->rd_filename);
|
|
redir->rd_filename = p;
|
|
heredoc_cnt--;
|
|
}
|
|
redir = redir->next;
|
|
}
|
|
cmd++;
|
|
}
|
|
pi = pi->next;
|
|
}
|
|
#if 0
|
|
/* Should be 0. If it isn't, it's a parse error */
|
|
if (heredoc_cnt)
|
|
bb_error_msg_and_die("heredoc BUG 2");
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int run_list(struct pipe *pi);
|
|
#if BB_MMU
|
|
#define parse_stream(pstring, input, end_trigger) \
|
|
parse_stream(input, end_trigger)
|
|
#endif
|
|
static struct pipe *parse_stream(char **pstring,
|
|
struct in_str *input,
|
|
int end_trigger);
|
|
|
|
|
|
#if !ENABLE_HUSH_FUNCTIONS
|
|
#define parse_group(dest, ctx, input, ch) \
|
|
parse_group(ctx, input, ch)
|
|
#endif
|
|
static int parse_group(o_string *dest, struct parse_context *ctx,
|
|
struct in_str *input, int ch)
|
|
{
|
|
/* dest contains characters seen prior to ( or {.
|
|
* Typically it's empty, but for function defs,
|
|
* it contains function name (without '()'). */
|
|
struct pipe *pipe_list;
|
|
int endch;
|
|
struct command *command = ctx->command;
|
|
|
|
debug_printf_parse("parse_group entered\n");
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (ch == '(' && !dest->has_quoted_part) {
|
|
if (dest->length)
|
|
if (done_word(dest, ctx))
|
|
return 1;
|
|
if (!command->argv)
|
|
goto skip; /* (... */
|
|
if (command->argv[1]) { /* word word ... (... */
|
|
syntax_error_unexpected_ch('(');
|
|
return 1;
|
|
}
|
|
/* it is "word(..." or "word (..." */
|
|
do
|
|
ch = i_getch(input);
|
|
while (ch == ' ' || ch == '\t');
|
|
if (ch != ')') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
do
|
|
ch = i_getch(input);
|
|
while (ch == ' ' || ch == '\t' || ch == '\n');
|
|
if (ch != '{') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
command->cmd_type = CMD_FUNCDEF;
|
|
goto skip;
|
|
}
|
|
#endif
|
|
|
|
#if 0 /* Prevented by caller */
|
|
if (command->argv /* word [word]{... */
|
|
|| dest->length /* word{... */
|
|
|| dest->has_quoted_part /* ""{... */
|
|
) {
|
|
syntax_error(NULL);
|
|
debug_printf_parse("parse_group return 1: "
|
|
"syntax error, groups and arglists don't mix\n");
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
skip:
|
|
#endif
|
|
endch = '}';
|
|
if (ch == '(') {
|
|
endch = ')';
|
|
command->cmd_type = CMD_SUBSHELL;
|
|
} else {
|
|
/* bash does not allow "{echo...", requires whitespace */
|
|
ch = i_getch(input);
|
|
if (ch != ' ' && ch != '\t' && ch != '\n') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
}
|
|
|
|
{
|
|
#if BB_MMU
|
|
# define as_string NULL
|
|
#else
|
|
char *as_string = NULL;
|
|
#endif
|
|
pipe_list = parse_stream(&as_string, input, endch);
|
|
#if !BB_MMU
|
|
if (as_string)
|
|
o_addstr(&ctx->as_string, as_string);
|
|
#endif
|
|
/* empty ()/{} or parse error? */
|
|
if (!pipe_list || pipe_list == ERR_PTR) {
|
|
/* parse_stream already emitted error msg */
|
|
if (!BB_MMU)
|
|
free(as_string);
|
|
debug_printf_parse("parse_group return 1: "
|
|
"parse_stream returned %p\n", pipe_list);
|
|
return 1;
|
|
}
|
|
command->group = pipe_list;
|
|
#if !BB_MMU
|
|
as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
|
|
command->group_as_string = as_string;
|
|
debug_printf_parse("end of group, remembering as:'%s'\n",
|
|
command->group_as_string);
|
|
#endif
|
|
#undef as_string
|
|
}
|
|
debug_printf_parse("parse_group return 0\n");
|
|
return 0;
|
|
/* command remains "open", available for possible redirects */
|
|
}
|
|
|
|
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
|
|
/* Subroutines for copying $(...) and `...` things */
|
|
static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
|
|
/* '...' */
|
|
static int add_till_single_quote(o_string *dest, struct in_str *input)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('\'');
|
|
return 0;
|
|
}
|
|
if (ch == '\'')
|
|
return 1;
|
|
o_addchr(dest, ch);
|
|
}
|
|
}
|
|
/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
|
|
static int add_till_double_quote(o_string *dest, struct in_str *input)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('"');
|
|
return 0;
|
|
}
|
|
if (ch == '"')
|
|
return 1;
|
|
if (ch == '\\') { /* \x. Copy both chars. */
|
|
o_addchr(dest, ch);
|
|
ch = i_getch(input);
|
|
}
|
|
o_addchr(dest, ch);
|
|
if (ch == '`') {
|
|
if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
|
|
return 0;
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
//if (ch == '$') ...
|
|
}
|
|
}
|
|
/* Process `cmd` - copy contents until "`" is seen. Complicated by
|
|
* \` quoting.
|
|
* "Within the backquoted style of command substitution, backslash
|
|
* shall retain its literal meaning, except when followed by: '$', '`', or '\'.
|
|
* The search for the matching backquote shall be satisfied by the first
|
|
* backquote found without a preceding backslash; during this search,
|
|
* if a non-escaped backquote is encountered within a shell comment,
|
|
* a here-document, an embedded command substitution of the $(command)
|
|
* form, or a quoted string, undefined results occur. A single-quoted
|
|
* or double-quoted string that begins, but does not end, within the
|
|
* "`...`" sequence produces undefined results."
|
|
* Example Output
|
|
* echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
|
|
*/
|
|
static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == '`')
|
|
return 1;
|
|
if (ch == '\\') {
|
|
/* \x. Copy both unless it is \`, \$, \\ and maybe \" */
|
|
ch = i_getch(input);
|
|
if (ch != '`'
|
|
&& ch != '$'
|
|
&& ch != '\\'
|
|
&& (!in_dquote || ch != '"')
|
|
) {
|
|
o_addchr(dest, '\\');
|
|
}
|
|
}
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('`');
|
|
return 0;
|
|
}
|
|
o_addchr(dest, ch);
|
|
}
|
|
}
|
|
/* Process $(cmd) - copy contents until ")" is seen. Complicated by
|
|
* quoting and nested ()s.
|
|
* "With the $(command) style of command substitution, all characters
|
|
* following the open parenthesis to the matching closing parenthesis
|
|
* constitute the command. Any valid shell script can be used for command,
|
|
* except a script consisting solely of redirections which produces
|
|
* unspecified results."
|
|
* Example Output
|
|
* echo $(echo '(TEST)' BEST) (TEST) BEST
|
|
* echo $(echo 'TEST)' BEST) TEST) BEST
|
|
* echo $(echo \(\(TEST\) BEST) ((TEST) BEST
|
|
*
|
|
* Also adapted to eat ${var%...} and $((...)) constructs, since ... part
|
|
* can contain arbitrary constructs, just like $(cmd).
|
|
* In bash compat mode, it needs to also be able to stop on ':' or '/'
|
|
* for ${var:N[:M]} and ${var/P[/R]} parsing.
|
|
*/
|
|
#define DOUBLE_CLOSE_CHAR_FLAG 0x80
|
|
static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
|
|
{
|
|
int ch;
|
|
char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
|
|
# if ENABLE_HUSH_BASH_COMPAT
|
|
char end_char2 = end_ch >> 8;
|
|
# endif
|
|
end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
|
|
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch(end_ch);
|
|
return 0;
|
|
}
|
|
if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) {
|
|
if (!dbl)
|
|
break;
|
|
/* we look for closing )) of $((EXPR)) */
|
|
if (i_peek(input) == end_ch) {
|
|
i_getch(input); /* eat second ')' */
|
|
break;
|
|
}
|
|
}
|
|
o_addchr(dest, ch);
|
|
if (ch == '(' || ch == '{') {
|
|
ch = (ch == '(' ? ')' : '}');
|
|
if (!add_till_closing_bracket(dest, input, ch))
|
|
return 0;
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '\'') {
|
|
if (!add_till_single_quote(dest, input))
|
|
return 0;
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '"') {
|
|
if (!add_till_double_quote(dest, input))
|
|
return 0;
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '`') {
|
|
if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
|
|
return 0;
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '\\') {
|
|
/* \x. Copy verbatim. Important for \(, \) */
|
|
ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch(')');
|
|
return 0;
|
|
}
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
}
|
|
return ch;
|
|
}
|
|
#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS */
|
|
|
|
/* Return code: 0 for OK, 1 for syntax error */
|
|
#if BB_MMU
|
|
#define parse_dollar(as_string, dest, input, quote_mask) \
|
|
parse_dollar(dest, input, quote_mask)
|
|
#define as_string NULL
|
|
#endif
|
|
static int parse_dollar(o_string *as_string,
|
|
o_string *dest,
|
|
struct in_str *input, unsigned char quote_mask)
|
|
{
|
|
int ch = i_peek(input); /* first character after the $ */
|
|
|
|
debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
|
|
if (isalpha(ch)) {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
make_var:
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
while (1) {
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
o_addchr(dest, ch | quote_mask);
|
|
quote_mask = 0;
|
|
ch = i_peek(input);
|
|
if (!isalnum(ch) && ch != '_')
|
|
break;
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
}
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
} else if (isdigit(ch)) {
|
|
make_one_char_var:
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
o_addchr(dest, ch | quote_mask);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
} else switch (ch) {
|
|
case '$': /* pid */
|
|
case '!': /* last bg pid */
|
|
case '?': /* last exit code */
|
|
case '#': /* number of args */
|
|
case '*': /* args */
|
|
case '@': /* args */
|
|
goto make_one_char_var;
|
|
case '{': {
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
|
|
ch = i_getch(input); /* eat '{' */
|
|
nommu_addchr(as_string, ch);
|
|
|
|
ch = i_getch(input); /* first char after '{' */
|
|
/* It should be ${?}, or ${#var},
|
|
* or even ${?+subst} - operator acting on a special variable,
|
|
* or the beginning of variable name.
|
|
*/
|
|
if (ch == EOF
|
|
|| (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) /* not one of those */
|
|
) {
|
|
bad_dollar_syntax:
|
|
syntax_error_unterm_str("${name}");
|
|
debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
|
|
return 0;
|
|
}
|
|
nommu_addchr(as_string, ch);
|
|
ch |= quote_mask;
|
|
|
|
/* It's possible to just call add_till_closing_bracket() at this point.
|
|
* However, this regresses some of our testsuite cases
|
|
* which check invalid constructs like ${%}.
|
|
* Oh well... let's check that the var name part is fine... */
|
|
|
|
while (1) {
|
|
unsigned pos;
|
|
|
|
o_addchr(dest, ch);
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
if (ch == '}')
|
|
break;
|
|
|
|
if (!isalnum(ch) && ch != '_') {
|
|
unsigned end_ch;
|
|
unsigned char last_ch;
|
|
/* handle parameter expansions
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
|
|
*/
|
|
if (!strchr(VAR_SUBST_OPS, ch)) /* ${var<bad_char>... */
|
|
goto bad_dollar_syntax;
|
|
|
|
/* Eat everything until closing '}' (or ':') */
|
|
end_ch = '}';
|
|
if (ENABLE_HUSH_BASH_COMPAT
|
|
&& ch == ':'
|
|
&& !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
|
|
) {
|
|
/* It's ${var:N[:M]} thing */
|
|
end_ch = '}' * 0x100 + ':';
|
|
}
|
|
if (ENABLE_HUSH_BASH_COMPAT
|
|
&& ch == '/'
|
|
) {
|
|
/* It's ${var/[/]pattern[/repl]} thing */
|
|
if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
|
|
i_getch(input);
|
|
nommu_addchr(as_string, '/');
|
|
ch = '\\';
|
|
}
|
|
end_ch = '}' * 0x100 + '/';
|
|
}
|
|
o_addchr(dest, ch);
|
|
again:
|
|
if (!BB_MMU)
|
|
pos = dest->length;
|
|
#if ENABLE_HUSH_DOLLAR_OPS
|
|
last_ch = add_till_closing_bracket(dest, input, end_ch);
|
|
if (last_ch == 0) /* error? */
|
|
return 0;
|
|
#else
|
|
#error Simple code to only allow ${var} is not implemented
|
|
#endif
|
|
if (as_string) {
|
|
o_addstr(as_string, dest->data + pos);
|
|
o_addchr(as_string, last_ch);
|
|
}
|
|
|
|
if (ENABLE_HUSH_BASH_COMPAT && (end_ch & 0xff00)) {
|
|
/* close the first block: */
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
/* while parsing N from ${var:N[:M]}
|
|
* or pattern from ${var/[/]pattern[/repl]} */
|
|
if ((end_ch & 0xff) == last_ch) {
|
|
/* got ':' or '/'- parse the rest */
|
|
end_ch = '}';
|
|
goto again;
|
|
}
|
|
/* got '}' */
|
|
if (end_ch == '}' * 0x100 + ':') {
|
|
/* it's ${var:N} - emulate :999999999 */
|
|
o_addstr(dest, "999999999");
|
|
} /* else: it's ${var/[/]pattern} */
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
break;
|
|
}
|
|
#if ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK
|
|
case '(': {
|
|
unsigned pos;
|
|
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
# if ENABLE_SH_MATH_SUPPORT
|
|
if (i_peek(input) == '(') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, /*quote_mask |*/ '+');
|
|
if (!BB_MMU)
|
|
pos = dest->length;
|
|
if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
|
|
return 0; /* error */
|
|
if (as_string) {
|
|
o_addstr(as_string, dest->data + pos);
|
|
o_addchr(as_string, ')');
|
|
o_addchr(as_string, ')');
|
|
}
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
break;
|
|
}
|
|
# endif
|
|
# if ENABLE_HUSH_TICK
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, quote_mask | '`');
|
|
if (!BB_MMU)
|
|
pos = dest->length;
|
|
if (!add_till_closing_bracket(dest, input, ')'))
|
|
return 0; /* error */
|
|
if (as_string) {
|
|
o_addstr(as_string, dest->data + pos);
|
|
o_addchr(as_string, ')');
|
|
}
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
# endif
|
|
break;
|
|
}
|
|
#endif
|
|
case '_':
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
if (isalnum(ch)) { /* it's $_name or $_123 */
|
|
ch = '_';
|
|
goto make_var;
|
|
}
|
|
/* else: it's $_ */
|
|
/* TODO: $_ and $-: */
|
|
/* $_ Shell or shell script name; or last argument of last command
|
|
* (if last command wasn't a pipe; if it was, bash sets $_ to "");
|
|
* but in command's env, set to full pathname used to invoke it */
|
|
/* $- Option flags set by set builtin or shell options (-i etc) */
|
|
default:
|
|
o_addQchr(dest, '$');
|
|
}
|
|
debug_printf_parse("parse_dollar return 1 (ok)\n");
|
|
return 1;
|
|
#undef as_string
|
|
}
|
|
|
|
#if BB_MMU
|
|
# if ENABLE_HUSH_BASH_COMPAT
|
|
#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
|
encode_string(dest, input, dquote_end, process_bkslash)
|
|
# else
|
|
/* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
|
#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
|
encode_string(dest, input, dquote_end)
|
|
# endif
|
|
#define as_string NULL
|
|
|
|
#else /* !MMU */
|
|
|
|
# if ENABLE_HUSH_BASH_COMPAT
|
|
/* all parameters are needed, no macro tricks */
|
|
# else
|
|
#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
|
encode_string(as_string, dest, input, dquote_end)
|
|
# endif
|
|
#endif
|
|
static int encode_string(o_string *as_string,
|
|
o_string *dest,
|
|
struct in_str *input,
|
|
int dquote_end,
|
|
int process_bkslash)
|
|
{
|
|
#if !ENABLE_HUSH_BASH_COMPAT
|
|
const int process_bkslash = 1;
|
|
#endif
|
|
int ch;
|
|
int next;
|
|
|
|
again:
|
|
ch = i_getch(input);
|
|
if (ch != EOF)
|
|
nommu_addchr(as_string, ch);
|
|
if (ch == dquote_end) { /* may be only '"' or EOF */
|
|
debug_printf_parse("encode_string return 1 (ok)\n");
|
|
return 1;
|
|
}
|
|
/* note: can't move it above ch == dquote_end check! */
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('"');
|
|
return 0; /* error */
|
|
}
|
|
next = '\0';
|
|
if (ch != '\n') {
|
|
next = i_peek(input);
|
|
}
|
|
debug_printf_parse("\" ch=%c (%d) escape=%d\n",
|
|
ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
|
if (process_bkslash && ch == '\\') {
|
|
if (next == EOF) {
|
|
syntax_error("\\<eof>");
|
|
xfunc_die();
|
|
}
|
|
/* bash:
|
|
* "The backslash retains its special meaning [in "..."]
|
|
* only when followed by one of the following characters:
|
|
* $, `, ", \, or <newline>. A double quote may be quoted
|
|
* within double quotes by preceding it with a backslash."
|
|
* NB: in (unquoted) heredoc, above does not apply to ",
|
|
* therefore we check for it by "next == dquote_end" cond.
|
|
*/
|
|
if (next == dquote_end || strchr("$`\\\n", next)) {
|
|
ch = i_getch(input); /* eat next */
|
|
if (ch == '\n')
|
|
goto again; /* skip \<newline> */
|
|
} /* else: ch remains == '\\', and we double it below: */
|
|
o_addqchr(dest, ch); /* \c if c is a glob char, else just c */
|
|
nommu_addchr(as_string, ch);
|
|
goto again;
|
|
}
|
|
if (ch == '$') {
|
|
if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) {
|
|
debug_printf_parse("encode_string return 0: "
|
|
"parse_dollar returned 0 (error)\n");
|
|
return 0;
|
|
}
|
|
goto again;
|
|
}
|
|
#if ENABLE_HUSH_TICK
|
|
if (ch == '`') {
|
|
//unsigned pos = dest->length;
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, 0x80 | '`');
|
|
if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
|
|
return 0; /* error */
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
|
|
goto again;
|
|
}
|
|
#endif
|
|
o_addQchr(dest, ch);
|
|
goto again;
|
|
#undef as_string
|
|
}
|
|
|
|
/*
|
|
* Scan input until EOF or end_trigger char.
|
|
* Return a list of pipes to execute, or NULL on EOF
|
|
* or if end_trigger character is met.
|
|
* On syntax error, exit if shell is not interactive,
|
|
* reset parsing machinery and start parsing anew,
|
|
* or return ERR_PTR.
|
|
*/
|
|
static struct pipe *parse_stream(char **pstring,
|
|
struct in_str *input,
|
|
int end_trigger)
|
|
{
|
|
struct parse_context ctx;
|
|
o_string dest = NULL_O_STRING;
|
|
int heredoc_cnt;
|
|
|
|
/* Single-quote triggers a bypass of the main loop until its mate is
|
|
* found. When recursing, quote state is passed in via dest->o_expflags.
|
|
*/
|
|
debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
|
|
end_trigger ? end_trigger : 'X');
|
|
debug_enter();
|
|
|
|
/* If very first arg is "" or '', dest.data may end up NULL.
|
|
* Preventing this: */
|
|
o_addchr(&dest, '\0');
|
|
dest.length = 0;
|
|
|
|
/* We used to separate words on $IFS here. This was wrong.
|
|
* $IFS is used only for word splitting when $var is expanded,
|
|
* here we should use blank chars as separators, not $IFS
|
|
*/
|
|
|
|
if (MAYBE_ASSIGNMENT != 0)
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
initialize_context(&ctx);
|
|
heredoc_cnt = 0;
|
|
while (1) {
|
|
const char *is_blank;
|
|
const char *is_special;
|
|
int ch;
|
|
int next;
|
|
int redir_fd;
|
|
redir_type redir_style;
|
|
|
|
ch = i_getch(input);
|
|
debug_printf_parse(": ch=%c (%d) escape=%d\n",
|
|
ch, ch, !!(dest.o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
|
if (ch == EOF) {
|
|
struct pipe *pi;
|
|
|
|
if (heredoc_cnt) {
|
|
syntax_error_unterm_str("here document");
|
|
goto parse_error;
|
|
}
|
|
/* end_trigger == '}' case errors out earlier,
|
|
* checking only ')' */
|
|
if (end_trigger == ')') {
|
|
syntax_error_unterm_ch('(');
|
|
goto parse_error;
|
|
}
|
|
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
o_free(&dest);
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
pi = ctx.list_head;
|
|
/* If we got nothing... */
|
|
/* (this makes bare "&" cmd a no-op.
|
|
* bash says: "syntax error near unexpected token '&'") */
|
|
if (pi->num_cmds == 0
|
|
IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
|
|
) {
|
|
free_pipe_list(pi);
|
|
pi = NULL;
|
|
}
|
|
#if !BB_MMU
|
|
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
|
if (pstring)
|
|
*pstring = ctx.as_string.data;
|
|
else
|
|
o_free_unsafe(&ctx.as_string);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_parse("parse_stream return %p\n", pi);
|
|
return pi;
|
|
}
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
|
|
next = '\0';
|
|
if (ch != '\n')
|
|
next = i_peek(input);
|
|
|
|
is_special = "{}<>;&|()#'" /* special outside of "str" */
|
|
"\\$\"" IF_HUSH_TICK("`"); /* always special */
|
|
/* Are { and } special here? */
|
|
if (ctx.command->argv /* word [word]{... - non-special */
|
|
|| dest.length /* word{... - non-special */
|
|
|| dest.has_quoted_part /* ""{... - non-special */
|
|
|| (next != ';' /* }; - special */
|
|
&& next != ')' /* }) - special */
|
|
&& next != '&' /* }& and }&& ... - special */
|
|
&& next != '|' /* }|| ... - special */
|
|
&& !strchr(defifs, next) /* {word - non-special */
|
|
)
|
|
) {
|
|
/* They are not special, skip "{}" */
|
|
is_special += 2;
|
|
}
|
|
is_special = strchr(is_special, ch);
|
|
is_blank = strchr(defifs, ch);
|
|
|
|
if (!is_special && !is_blank) { /* ordinary char */
|
|
ordinary_char:
|
|
o_addQchr(&dest, ch);
|
|
if ((dest.o_assignment == MAYBE_ASSIGNMENT
|
|
|| dest.o_assignment == WORD_IS_KEYWORD)
|
|
&& ch == '='
|
|
&& is_well_formed_var_name(dest.data, '=')
|
|
) {
|
|
dest.o_assignment = DEFINITELY_ASSIGNMENT;
|
|
debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (is_blank) {
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
if (ch == '\n') {
|
|
/* Is this a case when newline is simply ignored?
|
|
* Some examples:
|
|
* "cmd | <newline> cmd ..."
|
|
* "case ... in <newline> word) ..."
|
|
*/
|
|
if (IS_NULL_CMD(ctx.command)
|
|
&& dest.length == 0 && !dest.has_quoted_part
|
|
) {
|
|
/* This newline can be ignored. But...
|
|
* Without check #1, interactive shell
|
|
* ignores even bare <newline>,
|
|
* and shows the continuation prompt:
|
|
* ps1_prompt$ <enter>
|
|
* ps2> _ <=== wrong, should be ps1
|
|
* Without check #2, "cmd & <newline>"
|
|
* is similarly mistreated.
|
|
* (BTW, this makes "cmd & cmd"
|
|
* and "cmd && cmd" non-orthogonal.
|
|
* Really, ask yourself, why
|
|
* "cmd && <newline>" doesn't start
|
|
* cmd but waits for more input?
|
|
* No reason...)
|
|
*/
|
|
struct pipe *pi = ctx.list_head;
|
|
if (pi->num_cmds != 0 /* check #1 */
|
|
&& pi->followup != PIPE_BG /* check #2 */
|
|
) {
|
|
continue;
|
|
}
|
|
}
|
|
/* Treat newline as a command separator. */
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
|
|
if (heredoc_cnt) {
|
|
if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
|
|
goto parse_error;
|
|
}
|
|
heredoc_cnt = 0;
|
|
}
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
|
ch = ';';
|
|
/* note: if (is_blank) continue;
|
|
* will still trigger for us */
|
|
}
|
|
}
|
|
|
|
/* "cmd}" or "cmd }..." without semicolon or &:
|
|
* } is an ordinary char in this case, even inside { cmd; }
|
|
* Pathological example: { ""}; } should exec "}" cmd
|
|
*/
|
|
if (ch == '}') {
|
|
if (!IS_NULL_CMD(ctx.command) /* cmd } */
|
|
|| dest.length != 0 /* word} */
|
|
|| dest.has_quoted_part /* ""} */
|
|
) {
|
|
goto ordinary_char;
|
|
}
|
|
if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
|
|
goto skip_end_trigger;
|
|
/* else: } does terminate a group */
|
|
}
|
|
|
|
if (end_trigger && end_trigger == ch
|
|
&& (ch != ';' || heredoc_cnt == 0)
|
|
#if ENABLE_HUSH_CASE
|
|
&& (ch != ')'
|
|
|| ctx.ctx_res_w != RES_MATCH
|
|
|| (!dest.has_quoted_part && strcmp(dest.data, "esac") == 0)
|
|
)
|
|
#endif
|
|
) {
|
|
if (heredoc_cnt) {
|
|
/* This is technically valid:
|
|
* { cat <<HERE; }; echo Ok
|
|
* heredoc
|
|
* heredoc
|
|
* HERE
|
|
* but we don't support this.
|
|
* We require heredoc to be in enclosing {}/(),
|
|
* if any.
|
|
*/
|
|
syntax_error_unterm_str("here document");
|
|
goto parse_error;
|
|
}
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
|
/* Do we sit outside of any if's, loops or case's? */
|
|
if (!HAS_KEYWORDS
|
|
IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
|
|
) {
|
|
o_free(&dest);
|
|
#if !BB_MMU
|
|
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
|
if (pstring)
|
|
*pstring = ctx.as_string.data;
|
|
else
|
|
o_free_unsafe(&ctx.as_string);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_parse("parse_stream return %p: "
|
|
"end_trigger char found\n",
|
|
ctx.list_head);
|
|
return ctx.list_head;
|
|
}
|
|
}
|
|
skip_end_trigger:
|
|
if (is_blank)
|
|
continue;
|
|
|
|
/* Catch <, > before deciding whether this word is
|
|
* an assignment. a=1 2>z b=2: b=2 is still assignment */
|
|
switch (ch) {
|
|
case '>':
|
|
redir_fd = redirect_opt_num(&dest);
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
redir_style = REDIRECT_OVERWRITE;
|
|
if (next == '>') {
|
|
redir_style = REDIRECT_APPEND;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
}
|
|
#if 0
|
|
else if (next == '(') {
|
|
syntax_error(">(process) not supported");
|
|
goto parse_error;
|
|
}
|
|
#endif
|
|
if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
|
goto parse_error;
|
|
continue; /* back to top of while (1) */
|
|
case '<':
|
|
redir_fd = redirect_opt_num(&dest);
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
redir_style = REDIRECT_INPUT;
|
|
if (next == '<') {
|
|
redir_style = REDIRECT_HEREDOC;
|
|
heredoc_cnt++;
|
|
debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
} else if (next == '>') {
|
|
redir_style = REDIRECT_IO;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
}
|
|
#if 0
|
|
else if (next == '(') {
|
|
syntax_error("<(process) not supported");
|
|
goto parse_error;
|
|
}
|
|
#endif
|
|
if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
|
goto parse_error;
|
|
continue; /* back to top of while (1) */
|
|
case '#':
|
|
if (dest.length == 0 && !dest.has_quoted_part) {
|
|
/* skip "#comment" */
|
|
while (1) {
|
|
ch = i_peek(input);
|
|
if (ch == EOF || ch == '\n')
|
|
break;
|
|
i_getch(input);
|
|
/* note: we do not add it to &ctx.as_string */
|
|
}
|
|
nommu_addchr(&ctx.as_string, '\n');
|
|
continue; /* back to top of while (1) */
|
|
}
|
|
break;
|
|
case '\\':
|
|
if (next == '\n') {
|
|
/* It's "\<newline>" */
|
|
#if !BB_MMU
|
|
/* Remove trailing '\' from ctx.as_string */
|
|
ctx.as_string.data[--ctx.as_string.length] = '\0';
|
|
#endif
|
|
ch = i_getch(input); /* eat it */
|
|
continue; /* back to top of while (1) */
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (dest.o_assignment == MAYBE_ASSIGNMENT
|
|
/* check that we are not in word in "a=1 2>word b=1": */
|
|
&& !ctx.pending_redirect
|
|
) {
|
|
/* ch is a special char and thus this word
|
|
* cannot be an assignment */
|
|
dest.o_assignment = NOT_ASSIGNMENT;
|
|
debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
|
}
|
|
|
|
/* Note: nommu_addchr(&ctx.as_string, ch) is already done */
|
|
|
|
switch (ch) {
|
|
case '#': /* non-comment #: "echo a#b" etc */
|
|
o_addQchr(&dest, ch);
|
|
break;
|
|
case '\\':
|
|
if (next == EOF) {
|
|
syntax_error("\\<eof>");
|
|
xfunc_die();
|
|
}
|
|
ch = i_getch(input);
|
|
/* note: ch != '\n' (that case does not reach this place) */
|
|
o_addchr(&dest, '\\');
|
|
/*nommu_addchr(&ctx.as_string, '\\'); - already done */
|
|
o_addchr(&dest, ch);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
/* Example: echo Hello \2>file
|
|
* we need to know that word 2 is quoted */
|
|
dest.has_quoted_part = 1;
|
|
break;
|
|
case '$':
|
|
if (!parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0)) {
|
|
debug_printf_parse("parse_stream parse error: "
|
|
"parse_dollar returned 0 (error)\n");
|
|
goto parse_error;
|
|
}
|
|
break;
|
|
case '\'':
|
|
dest.has_quoted_part = 1;
|
|
if (next == '\'' && !ctx.pending_redirect) {
|
|
insert_empty_quoted_str_marker:
|
|
nommu_addchr(&ctx.as_string, next);
|
|
i_getch(input); /* eat second ' */
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
} else {
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('\'');
|
|
goto parse_error;
|
|
}
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
if (ch == '\'')
|
|
break;
|
|
o_addqchr(&dest, ch);
|
|
}
|
|
}
|
|
break;
|
|
case '"':
|
|
dest.has_quoted_part = 1;
|
|
if (next == '"' && !ctx.pending_redirect)
|
|
goto insert_empty_quoted_str_marker;
|
|
if (dest.o_assignment == NOT_ASSIGNMENT)
|
|
dest.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
|
|
if (!encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
|
|
goto parse_error;
|
|
dest.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
|
|
break;
|
|
#if ENABLE_HUSH_TICK
|
|
case '`': {
|
|
USE_FOR_NOMMU(unsigned pos;)
|
|
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(&dest, '`');
|
|
USE_FOR_NOMMU(pos = dest.length;)
|
|
if (!add_till_backquote(&dest, input, /*in_dquote:*/ 0))
|
|
goto parse_error;
|
|
# if !BB_MMU
|
|
o_addstr(&ctx.as_string, dest.data + pos);
|
|
o_addchr(&ctx.as_string, '`');
|
|
# endif
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
//debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
|
|
break;
|
|
}
|
|
#endif
|
|
case ';':
|
|
#if ENABLE_HUSH_CASE
|
|
case_semi:
|
|
#endif
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
#if ENABLE_HUSH_CASE
|
|
/* Eat multiple semicolons, detect
|
|
* whether it means something special */
|
|
while (1) {
|
|
ch = i_peek(input);
|
|
if (ch != ';')
|
|
break;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
if (ctx.ctx_res_w == RES_CASE_BODY) {
|
|
ctx.ctx_dsemicolon = 1;
|
|
ctx.ctx_res_w = RES_MATCH;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
new_cmd:
|
|
/* We just finished a cmd. New one may start
|
|
* with an assignment */
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
|
break;
|
|
case '&':
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
if (next == '&') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
done_pipe(&ctx, PIPE_AND);
|
|
} else {
|
|
done_pipe(&ctx, PIPE_BG);
|
|
}
|
|
goto new_cmd;
|
|
case '|':
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx.ctx_res_w == RES_MATCH)
|
|
break; /* we are in case's "word | word)" */
|
|
#endif
|
|
if (next == '|') { /* || */
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
done_pipe(&ctx, PIPE_OR);
|
|
} else {
|
|
/* we could pick up a file descriptor choice here
|
|
* with redirect_opt_num(), but bash doesn't do it.
|
|
* "echo foo 2| cat" yields "foo 2". */
|
|
done_command(&ctx);
|
|
#if !BB_MMU
|
|
o_reset_to_empty_unquoted(&ctx.as_string);
|
|
#endif
|
|
}
|
|
goto new_cmd;
|
|
case '(':
|
|
#if ENABLE_HUSH_CASE
|
|
/* "case... in [(]word)..." - skip '(' */
|
|
if (ctx.ctx_res_w == RES_MATCH
|
|
&& ctx.command->argv == NULL /* not (word|(... */
|
|
&& dest.length == 0 /* not word(... */
|
|
&& dest.has_quoted_part == 0 /* not ""(... */
|
|
) {
|
|
continue;
|
|
}
|
|
#endif
|
|
case '{':
|
|
if (parse_group(&dest, &ctx, input, ch) != 0) {
|
|
goto parse_error;
|
|
}
|
|
goto new_cmd;
|
|
case ')':
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx.ctx_res_w == RES_MATCH)
|
|
goto case_semi;
|
|
#endif
|
|
case '}':
|
|
/* proper use of this character is caught by end_trigger:
|
|
* if we see {, we call parse_group(..., end_trigger='}')
|
|
* and it will match } earlier (not here). */
|
|
syntax_error_unexpected_ch(ch);
|
|
goto parse_error;
|
|
default:
|
|
if (HUSH_DEBUG)
|
|
bb_error_msg_and_die("BUG: unexpected %c\n", ch);
|
|
}
|
|
} /* while (1) */
|
|
|
|
parse_error:
|
|
{
|
|
struct parse_context *pctx;
|
|
IF_HAS_KEYWORDS(struct parse_context *p2;)
|
|
|
|
/* Clean up allocated tree.
|
|
* Sample for finding leaks on syntax error recovery path.
|
|
* Run it from interactive shell, watch pmap `pidof hush`.
|
|
* while if false; then false; fi; do break; fi
|
|
* Samples to catch leaks at execution:
|
|
* while if (true | {true;}); then echo ok; fi; do break; done
|
|
* while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
|
|
*/
|
|
pctx = &ctx;
|
|
do {
|
|
/* Update pipe/command counts,
|
|
* otherwise freeing may miss some */
|
|
done_pipe(pctx, PIPE_SEQ);
|
|
debug_printf_clean("freeing list %p from ctx %p\n",
|
|
pctx->list_head, pctx);
|
|
debug_print_tree(pctx->list_head, 0);
|
|
free_pipe_list(pctx->list_head);
|
|
debug_printf_clean("freed list %p\n", pctx->list_head);
|
|
#if !BB_MMU
|
|
o_free_unsafe(&pctx->as_string);
|
|
#endif
|
|
IF_HAS_KEYWORDS(p2 = pctx->stack;)
|
|
if (pctx != &ctx) {
|
|
free(pctx);
|
|
}
|
|
IF_HAS_KEYWORDS(pctx = p2;)
|
|
} while (HAS_KEYWORDS && pctx);
|
|
|
|
o_free(&dest);
|
|
G.last_exitcode = 1;
|
|
#if !BB_MMU
|
|
if (pstring)
|
|
*pstring = NULL;
|
|
#endif
|
|
debug_leave();
|
|
return ERR_PTR;
|
|
}
|
|
}
|
|
|
|
|
|
/*** Execution routines ***/
|
|
|
|
/* Expansion can recurse, need forward decls: */
|
|
#if !ENABLE_HUSH_BASH_COMPAT
|
|
/* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
|
#define expand_string_to_string(str, do_unbackslash) \
|
|
expand_string_to_string(str)
|
|
#endif
|
|
static char *expand_string_to_string(const char *str, int do_unbackslash);
|
|
#if ENABLE_HUSH_TICK
|
|
static int process_command_subs(o_string *dest, const char *s);
|
|
#endif
|
|
|
|
/* expand_strvec_to_strvec() takes a list of strings, expands
|
|
* all variable references within and returns a pointer to
|
|
* a list of expanded strings, possibly with larger number
|
|
* of strings. (Think VAR="a b"; echo $VAR).
|
|
* This new list is allocated as a single malloc block.
|
|
* NULL-terminated list of char* pointers is at the beginning of it,
|
|
* followed by strings themselves.
|
|
* Caller can deallocate entire list by single free(list). */
|
|
|
|
/* A horde of its helpers come first: */
|
|
|
|
static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
|
|
{
|
|
while (--len >= 0) {
|
|
char c = *str++;
|
|
|
|
#if ENABLE_HUSH_BRACE_EXPANSION
|
|
if (c == '{' || c == '}') {
|
|
/* { -> \{, } -> \} */
|
|
o_addchr(o, '\\');
|
|
/* And now we want to add { or } and continue:
|
|
* o_addchr(o, c);
|
|
* continue;
|
|
* luckily, just falling throught achieves this.
|
|
*/
|
|
}
|
|
#endif
|
|
o_addchr(o, c);
|
|
if (c == '\\') {
|
|
/* \z -> \\\z; \<eol> -> \\<eol> */
|
|
o_addchr(o, '\\');
|
|
if (len) {
|
|
len--;
|
|
o_addchr(o, '\\');
|
|
o_addchr(o, *str++);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Store given string, finalizing the word and starting new one whenever
|
|
* we encounter IFS char(s). This is used for expanding variable values.
|
|
* End-of-string does NOT finalize word: think about 'echo -$VAR-'.
|
|
* Return in *ended_with_ifs:
|
|
* 1 - ended with IFS char, else 0 (this includes case of empty str).
|
|
*/
|
|
static int expand_on_ifs(int *ended_with_ifs, o_string *output, int n, const char *str)
|
|
{
|
|
int last_is_ifs = 0;
|
|
|
|
while (1) {
|
|
int word_len;
|
|
|
|
if (!*str) /* EOL - do not finalize word */
|
|
break;
|
|
word_len = strcspn(str, G.ifs);
|
|
if (word_len) {
|
|
/* We have WORD_LEN leading non-IFS chars */
|
|
if (!(output->o_expflags & EXP_FLAG_GLOB)) {
|
|
o_addblock(output, str, word_len);
|
|
} else {
|
|
/* Protect backslashes against globbing up :)
|
|
* Example: "v='\*'; echo b$v" prints "b\*"
|
|
* (and does not try to glob on "*")
|
|
*/
|
|
o_addblock_duplicate_backslash(output, str, word_len);
|
|
/*/ Why can't we do it easier? */
|
|
/*o_addblock(output, str, word_len); - WRONG: "v='\*'; echo Z$v" prints "Z*" instead of "Z\*" */
|
|
/*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */
|
|
}
|
|
last_is_ifs = 0;
|
|
str += word_len;
|
|
if (!*str) /* EOL - do not finalize word */
|
|
break;
|
|
}
|
|
|
|
/* We know str here points to at least one IFS char */
|
|
last_is_ifs = 1;
|
|
str += strspn(str, G.ifs); /* skip IFS chars */
|
|
if (!*str) /* EOL - do not finalize word */
|
|
break;
|
|
|
|
/* Start new word... but not always! */
|
|
/* Case "v=' a'; echo ''$v": we do need to finalize empty word: */
|
|
if (output->has_quoted_part
|
|
/* Case "v=' a'; echo $v":
|
|
* here nothing precedes the space in $v expansion,
|
|
* therefore we should not finish the word
|
|
* (IOW: if there *is* word to finalize, only then do it):
|
|
*/
|
|
|| (n > 0 && output->data[output->length - 1])
|
|
) {
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_on_ifs", output, n);
|
|
n = o_save_ptr(output, n);
|
|
}
|
|
}
|
|
|
|
if (ended_with_ifs)
|
|
*ended_with_ifs = last_is_ifs;
|
|
debug_print_list("expand_on_ifs[1]", output, n);
|
|
return n;
|
|
}
|
|
|
|
/* Helper to expand $((...)) and heredoc body. These act as if
|
|
* they are in double quotes, with the exception that they are not :).
|
|
* Just the rules are similar: "expand only $var and `cmd`"
|
|
*
|
|
* Returns malloced string.
|
|
* As an optimization, we return NULL if expansion is not needed.
|
|
*/
|
|
#if !ENABLE_HUSH_BASH_COMPAT
|
|
/* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
|
#define encode_then_expand_string(str, process_bkslash, do_unbackslash) \
|
|
encode_then_expand_string(str)
|
|
#endif
|
|
static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
|
|
{
|
|
char *exp_str;
|
|
struct in_str input;
|
|
o_string dest = NULL_O_STRING;
|
|
|
|
if (!strchr(str, '$')
|
|
&& !strchr(str, '\\')
|
|
#if ENABLE_HUSH_TICK
|
|
&& !strchr(str, '`')
|
|
#endif
|
|
) {
|
|
return NULL;
|
|
}
|
|
|
|
/* We need to expand. Example:
|
|
* echo $(($a + `echo 1`)) $((1 + $((2)) ))
|
|
*/
|
|
setup_string_in_str(&input, str);
|
|
encode_string(NULL, &dest, &input, EOF, process_bkslash);
|
|
//TODO: error check (encode_string returns 0 on error)?
|
|
//bb_error_msg("'%s' -> '%s'", str, dest.data);
|
|
exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
|
|
//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
|
|
o_free_unsafe(&dest);
|
|
return exp_str;
|
|
}
|
|
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p)
|
|
{
|
|
arith_state_t math_state;
|
|
arith_t res;
|
|
char *exp_str;
|
|
|
|
math_state.lookupvar = get_local_var_value;
|
|
math_state.setvar = set_local_var_from_halves;
|
|
//math_state.endofname = endofname;
|
|
exp_str = encode_then_expand_string(arg, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
|
res = arith(&math_state, exp_str ? exp_str : arg);
|
|
free(exp_str);
|
|
if (errmsg_p)
|
|
*errmsg_p = math_state.errmsg;
|
|
if (math_state.errmsg)
|
|
die_if_script(math_state.errmsg);
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
/* ${var/[/]pattern[/repl]} helpers */
|
|
static char *strstr_pattern(char *val, const char *pattern, int *size)
|
|
{
|
|
while (1) {
|
|
char *end = scan_and_match(val, pattern, SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF);
|
|
debug_printf_varexp("val:'%s' pattern:'%s' end:'%s'\n", val, pattern, end);
|
|
if (end) {
|
|
*size = end - val;
|
|
return val;
|
|
}
|
|
if (*val == '\0')
|
|
return NULL;
|
|
/* Optimization: if "*pat" did not match the start of "string",
|
|
* we know that "tring", "ring" etc will not match too:
|
|
*/
|
|
if (pattern[0] == '*')
|
|
return NULL;
|
|
val++;
|
|
}
|
|
}
|
|
static char *replace_pattern(char *val, const char *pattern, const char *repl, char exp_op)
|
|
{
|
|
char *result = NULL;
|
|
unsigned res_len = 0;
|
|
unsigned repl_len = strlen(repl);
|
|
|
|
while (1) {
|
|
int size;
|
|
char *s = strstr_pattern(val, pattern, &size);
|
|
if (!s)
|
|
break;
|
|
|
|
result = xrealloc(result, res_len + (s - val) + repl_len + 1);
|
|
memcpy(result + res_len, val, s - val);
|
|
res_len += s - val;
|
|
strcpy(result + res_len, repl);
|
|
res_len += repl_len;
|
|
debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result);
|
|
|
|
val = s + size;
|
|
if (exp_op == '/')
|
|
break;
|
|
}
|
|
if (val[0] && result) {
|
|
result = xrealloc(result, res_len + strlen(val) + 1);
|
|
strcpy(result + res_len, val);
|
|
debug_printf_varexp("val:'%s' result:'%s'\n", val, result);
|
|
}
|
|
debug_printf_varexp("result:'%s'\n", result);
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
/* Helper:
|
|
* Handles <SPECIAL_VAR_SYMBOL>varname...<SPECIAL_VAR_SYMBOL> construct.
|
|
*/
|
|
static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
|
|
{
|
|
const char *val = NULL;
|
|
char *to_be_freed = NULL;
|
|
char *p = *pp;
|
|
char *var;
|
|
char first_char;
|
|
char exp_op;
|
|
char exp_save = exp_save; /* for compiler */
|
|
char *exp_saveptr; /* points to expansion operator */
|
|
char *exp_word = exp_word; /* for compiler */
|
|
char arg0;
|
|
|
|
*p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
|
|
var = arg;
|
|
exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;
|
|
arg0 = arg[0];
|
|
first_char = arg[0] = arg0 & 0x7f;
|
|
exp_op = 0;
|
|
|
|
if (first_char == '#' /* ${#... */
|
|
&& arg[1] && !exp_saveptr /* not ${#} and not ${#<op_char>...} */
|
|
) {
|
|
/* It must be length operator: ${#var} */
|
|
var++;
|
|
exp_op = 'L';
|
|
} else {
|
|
/* Maybe handle parameter expansion */
|
|
if (exp_saveptr /* if 2nd char is one of expansion operators */
|
|
&& strchr(NUMERIC_SPECVARS_STR, first_char) /* 1st char is special variable */
|
|
) {
|
|
/* ${?:0}, ${#[:]%0} etc */
|
|
exp_saveptr = var + 1;
|
|
} else {
|
|
/* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */
|
|
exp_saveptr = var+1 + strcspn(var+1, VAR_ENCODED_SUBST_OPS);
|
|
}
|
|
exp_op = exp_save = *exp_saveptr;
|
|
if (exp_op) {
|
|
exp_word = exp_saveptr + 1;
|
|
if (exp_op == ':') {
|
|
exp_op = *exp_word++;
|
|
//TODO: try ${var:} and ${var:bogus} in non-bash config
|
|
if (ENABLE_HUSH_BASH_COMPAT
|
|
&& (!exp_op || !strchr(MINUS_PLUS_EQUAL_QUESTION, exp_op))
|
|
) {
|
|
/* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */
|
|
exp_op = ':';
|
|
exp_word--;
|
|
}
|
|
}
|
|
*exp_saveptr = '\0';
|
|
} /* else: it's not an expansion op, but bare ${var} */
|
|
}
|
|
|
|
/* Look up the variable in question */
|
|
if (isdigit(var[0])) {
|
|
/* parse_dollar should have vetted var for us */
|
|
int n = xatoi_positive(var);
|
|
if (n < G.global_argc)
|
|
val = G.global_argv[n];
|
|
/* else val remains NULL: $N with too big N */
|
|
} else {
|
|
switch (var[0]) {
|
|
case '$': /* pid */
|
|
val = utoa(G.root_pid);
|
|
break;
|
|
case '!': /* bg pid */
|
|
val = G.last_bg_pid ? utoa(G.last_bg_pid) : "";
|
|
break;
|
|
case '?': /* exitcode */
|
|
val = utoa(G.last_exitcode);
|
|
break;
|
|
case '#': /* argc */
|
|
val = utoa(G.global_argc ? G.global_argc-1 : 0);
|
|
break;
|
|
default:
|
|
val = get_local_var_value(var);
|
|
}
|
|
}
|
|
|
|
/* Handle any expansions */
|
|
if (exp_op == 'L') {
|
|
debug_printf_expand("expand: length(%s)=", val);
|
|
val = utoa(val ? strlen(val) : 0);
|
|
debug_printf_expand("%s\n", val);
|
|
} else if (exp_op) {
|
|
if (exp_op == '%' || exp_op == '#') {
|
|
/* Standard-mandated substring removal ops:
|
|
* ${parameter%word} - remove smallest suffix pattern
|
|
* ${parameter%%word} - remove largest suffix pattern
|
|
* ${parameter#word} - remove smallest prefix pattern
|
|
* ${parameter##word} - remove largest prefix pattern
|
|
*
|
|
* Word is expanded to produce a glob pattern.
|
|
* Then var's value is matched to it and matching part removed.
|
|
*/
|
|
if (val && val[0]) {
|
|
char *t;
|
|
char *exp_exp_word;
|
|
char *loc;
|
|
unsigned scan_flags = pick_scan(exp_op, *exp_word);
|
|
if (exp_op == *exp_word) /* ## or %% */
|
|
exp_word++;
|
|
exp_exp_word = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
|
if (exp_exp_word)
|
|
exp_word = exp_exp_word;
|
|
/* HACK ALERT. We depend here on the fact that
|
|
* G.global_argv and results of utoa and get_local_var_value
|
|
* are actually in writable memory:
|
|
* scan_and_match momentarily stores NULs there. */
|
|
t = (char*)val;
|
|
loc = scan_and_match(t, exp_word, scan_flags);
|
|
//bb_error_msg("op:%c str:'%s' pat:'%s' res:'%s'",
|
|
// exp_op, t, exp_word, loc);
|
|
free(exp_exp_word);
|
|
if (loc) { /* match was found */
|
|
if (scan_flags & SCAN_MATCH_LEFT_HALF) /* #[#] */
|
|
val = loc; /* take right part */
|
|
else /* %[%] */
|
|
val = to_be_freed = xstrndup(val, loc - val); /* left */
|
|
}
|
|
}
|
|
}
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
else if (exp_op == '/' || exp_op == '\\') {
|
|
/* It's ${var/[/]pattern[/repl]} thing.
|
|
* Note that in encoded form it has TWO parts:
|
|
* var/pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
|
|
* and if // is used, it is encoded as \:
|
|
* var\pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
|
|
*/
|
|
/* Empty variable always gives nothing: */
|
|
// "v=''; echo ${v/*/w}" prints "", not "w"
|
|
if (val && val[0]) {
|
|
/* pattern uses non-standard expansion.
|
|
* repl should be unbackslashed and globbed
|
|
* by the usual expansion rules:
|
|
* >az; >bz;
|
|
* v='a bz'; echo "${v/a*z/a*z}" prints "a*z"
|
|
* v='a bz'; echo "${v/a*z/\z}" prints "\z"
|
|
* v='a bz'; echo ${v/a*z/a*z} prints "az"
|
|
* v='a bz'; echo ${v/a*z/\z} prints "z"
|
|
* (note that a*z _pattern_ is never globbed!)
|
|
*/
|
|
char *pattern, *repl, *t;
|
|
pattern = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 0);
|
|
if (!pattern)
|
|
pattern = xstrdup(exp_word);
|
|
debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern);
|
|
*p++ = SPECIAL_VAR_SYMBOL;
|
|
exp_word = p;
|
|
p = strchr(p, SPECIAL_VAR_SYMBOL);
|
|
*p = '\0';
|
|
repl = encode_then_expand_string(exp_word, /*process_bkslash:*/ arg0 & 0x80, /*unbackslash:*/ 1);
|
|
debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl);
|
|
/* HACK ALERT. We depend here on the fact that
|
|
* G.global_argv and results of utoa and get_local_var_value
|
|
* are actually in writable memory:
|
|
* replace_pattern momentarily stores NULs there. */
|
|
t = (char*)val;
|
|
to_be_freed = replace_pattern(t,
|
|
pattern,
|
|
(repl ? repl : exp_word),
|
|
exp_op);
|
|
if (to_be_freed) /* at least one replace happened */
|
|
val = to_be_freed;
|
|
free(pattern);
|
|
free(repl);
|
|
}
|
|
}
|
|
#endif
|
|
else if (exp_op == ':') {
|
|
#if ENABLE_HUSH_BASH_COMPAT && ENABLE_SH_MATH_SUPPORT
|
|
/* It's ${var:N[:M]} bashism.
|
|
* Note that in encoded form it has TWO parts:
|
|
* var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL>
|
|
*/
|
|
arith_t beg, len;
|
|
const char *errmsg;
|
|
|
|
beg = expand_and_evaluate_arith(exp_word, &errmsg);
|
|
if (errmsg)
|
|
goto arith_err;
|
|
debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg);
|
|
*p++ = SPECIAL_VAR_SYMBOL;
|
|
exp_word = p;
|
|
p = strchr(p, SPECIAL_VAR_SYMBOL);
|
|
*p = '\0';
|
|
len = expand_and_evaluate_arith(exp_word, &errmsg);
|
|
if (errmsg)
|
|
goto arith_err;
|
|
debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len);
|
|
if (len >= 0) { /* bash compat: len < 0 is illegal */
|
|
if (beg < 0) /* bash compat */
|
|
beg = 0;
|
|
debug_printf_varexp("from val:'%s'\n", val);
|
|
if (len == 0 || !val || beg >= strlen(val)) {
|
|
arith_err:
|
|
val = NULL;
|
|
} else {
|
|
/* Paranoia. What if user entered 9999999999999
|
|
* which fits in arith_t but not int? */
|
|
if (len >= INT_MAX)
|
|
len = INT_MAX;
|
|
val = to_be_freed = xstrndup(val + beg, len);
|
|
}
|
|
debug_printf_varexp("val:'%s'\n", val);
|
|
} else
|
|
#endif
|
|
{
|
|
die_if_script("malformed ${%s:...}", var);
|
|
val = NULL;
|
|
}
|
|
} else { /* one of "-=+?" */
|
|
/* Standard-mandated substitution ops:
|
|
* ${var?word} - indicate error if unset
|
|
* If var is unset, word (or a message indicating it is unset
|
|
* if word is null) is written to standard error
|
|
* and the shell exits with a non-zero exit status.
|
|
* Otherwise, the value of var is substituted.
|
|
* ${var-word} - use default value
|
|
* If var is unset, word is substituted.
|
|
* ${var=word} - assign and use default value
|
|
* If var is unset, word is assigned to var.
|
|
* In all cases, final value of var is substituted.
|
|
* ${var+word} - use alternative value
|
|
* If var is unset, null is substituted.
|
|
* Otherwise, word is substituted.
|
|
*
|
|
* Word is subjected to tilde expansion, parameter expansion,
|
|
* command substitution, and arithmetic expansion.
|
|
* If word is not needed, it is not expanded.
|
|
*
|
|
* Colon forms (${var:-word}, ${var:=word} etc) do the same,
|
|
* but also treat null var as if it is unset.
|
|
*/
|
|
int use_word = (!val || ((exp_save == ':') && !val[0]));
|
|
if (exp_op == '+')
|
|
use_word = !use_word;
|
|
debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
|
|
(exp_save == ':') ? "true" : "false", use_word);
|
|
if (use_word) {
|
|
to_be_freed = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
|
if (to_be_freed)
|
|
exp_word = to_be_freed;
|
|
if (exp_op == '?') {
|
|
/* mimic bash message */
|
|
die_if_script("%s: %s",
|
|
var,
|
|
exp_word[0] ? exp_word : "parameter null or not set"
|
|
);
|
|
//TODO: how interactive bash aborts expansion mid-command?
|
|
} else {
|
|
val = exp_word;
|
|
}
|
|
|
|
if (exp_op == '=') {
|
|
/* ${var=[word]} or ${var:=[word]} */
|
|
if (isdigit(var[0]) || var[0] == '#') {
|
|
/* mimic bash message */
|
|
die_if_script("$%s: cannot assign in this way", var);
|
|
val = NULL;
|
|
} else {
|
|
char *new_var = xasprintf("%s=%s", var, val);
|
|
set_local_var(new_var, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
|
}
|
|
}
|
|
}
|
|
} /* one of "-=+?" */
|
|
|
|
*exp_saveptr = exp_save;
|
|
} /* if (exp_op) */
|
|
|
|
arg[0] = arg0;
|
|
|
|
*pp = p;
|
|
*to_be_freed_pp = to_be_freed;
|
|
return val;
|
|
}
|
|
|
|
/* Expand all variable references in given string, adding words to list[]
|
|
* at n, n+1,... positions. Return updated n (so that list[n] is next one
|
|
* to be filled). This routine is extremely tricky: has to deal with
|
|
* variables/parameters with whitespace, $* and $@, and constructs like
|
|
* 'echo -$*-'. If you play here, you must run testsuite afterwards! */
|
|
static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
|
|
{
|
|
/* output->o_expflags & EXP_FLAG_SINGLEWORD (0x80) if we are in
|
|
* expansion of right-hand side of assignment == 1-element expand.
|
|
*/
|
|
char cant_be_null = 0; /* only bit 0x80 matters */
|
|
int ended_in_ifs = 0; /* did last unquoted expansion end with IFS chars? */
|
|
char *p;
|
|
|
|
debug_printf_expand("expand_vars_to_list: arg:'%s' singleword:%x\n", arg,
|
|
!!(output->o_expflags & EXP_FLAG_SINGLEWORD));
|
|
debug_print_list("expand_vars_to_list", output, n);
|
|
n = o_save_ptr(output, n);
|
|
debug_print_list("expand_vars_to_list[0]", output, n);
|
|
|
|
while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
|
|
char first_ch;
|
|
char *to_be_freed = NULL;
|
|
const char *val = NULL;
|
|
#if ENABLE_HUSH_TICK
|
|
o_string subst_result = NULL_O_STRING;
|
|
#endif
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
char arith_buf[sizeof(arith_t)*3 + 2];
|
|
#endif
|
|
|
|
if (ended_in_ifs) {
|
|
o_addchr(output, '\0');
|
|
n = o_save_ptr(output, n);
|
|
ended_in_ifs = 0;
|
|
}
|
|
|
|
o_addblock(output, arg, p - arg);
|
|
debug_print_list("expand_vars_to_list[1]", output, n);
|
|
arg = ++p;
|
|
p = strchr(p, SPECIAL_VAR_SYMBOL);
|
|
|
|
/* Fetch special var name (if it is indeed one of them)
|
|
* and quote bit, force the bit on if singleword expansion -
|
|
* important for not getting v=$@ expand to many words. */
|
|
first_ch = arg[0] | (output->o_expflags & EXP_FLAG_SINGLEWORD);
|
|
|
|
/* Is this variable quoted and thus expansion can't be null?
|
|
* "$@" is special. Even if quoted, it can still
|
|
* expand to nothing (not even an empty string),
|
|
* thus it is excluded. */
|
|
if ((first_ch & 0x7f) != '@')
|
|
cant_be_null |= first_ch;
|
|
|
|
switch (first_ch & 0x7f) {
|
|
/* Highest bit in first_ch indicates that var is double-quoted */
|
|
case '*':
|
|
case '@': {
|
|
int i;
|
|
if (!G.global_argv[1])
|
|
break;
|
|
i = 1;
|
|
cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
|
|
if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
|
|
while (G.global_argv[i]) {
|
|
n = expand_on_ifs(NULL, output, n, G.global_argv[i]);
|
|
debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
|
|
if (G.global_argv[i++][0] && G.global_argv[i]) {
|
|
/* this argv[] is not empty and not last:
|
|
* put terminating NUL, start new word */
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_vars_to_list[2]", output, n);
|
|
n = o_save_ptr(output, n);
|
|
debug_print_list("expand_vars_to_list[3]", output, n);
|
|
}
|
|
}
|
|
} else
|
|
/* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....'
|
|
* and in this case should treat it like '$*' - see 'else...' below */
|
|
if (first_ch == ('@'|0x80) /* quoted $@ */
|
|
&& !(output->o_expflags & EXP_FLAG_SINGLEWORD) /* not v="$@" case */
|
|
) {
|
|
while (1) {
|
|
o_addQstr(output, G.global_argv[i]);
|
|
if (++i >= G.global_argc)
|
|
break;
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_vars_to_list[4]", output, n);
|
|
n = o_save_ptr(output, n);
|
|
}
|
|
} else { /* quoted $* (or v="$@" case): add as one word */
|
|
while (1) {
|
|
o_addQstr(output, G.global_argv[i]);
|
|
if (!G.global_argv[++i])
|
|
break;
|
|
if (G.ifs[0])
|
|
o_addchr(output, G.ifs[0]);
|
|
}
|
|
output->has_quoted_part = 1;
|
|
}
|
|
break;
|
|
}
|
|
case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
|
|
/* "Empty variable", used to make "" etc to not disappear */
|
|
output->has_quoted_part = 1;
|
|
arg++;
|
|
cant_be_null = 0x80;
|
|
break;
|
|
#if ENABLE_HUSH_TICK
|
|
case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
|
|
*p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
|
|
arg++;
|
|
/* Can't just stuff it into output o_string,
|
|
* expanded result may need to be globbed
|
|
* and $IFS-splitted */
|
|
debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
|
|
G.last_exitcode = process_command_subs(&subst_result, arg);
|
|
debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data);
|
|
val = subst_result.data;
|
|
goto store_val;
|
|
#endif
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
|
|
arith_t res;
|
|
|
|
arg++; /* skip '+' */
|
|
*p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
|
|
debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
|
|
res = expand_and_evaluate_arith(arg, NULL);
|
|
debug_printf_subst("ARITH RES '"ARITH_FMT"'\n", res);
|
|
sprintf(arith_buf, ARITH_FMT, res);
|
|
val = arith_buf;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
val = expand_one_var(&to_be_freed, arg, &p);
|
|
IF_HUSH_TICK(store_val:)
|
|
if (!(first_ch & 0x80)) { /* unquoted $VAR */
|
|
debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val,
|
|
!!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
|
if (val && val[0]) {
|
|
n = expand_on_ifs(&ended_in_ifs, output, n, val);
|
|
val = NULL;
|
|
}
|
|
} else { /* quoted $VAR, val will be appended below */
|
|
output->has_quoted_part = 1;
|
|
debug_printf_expand("quoted '%s', output->o_escape:%d\n", val,
|
|
!!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
|
}
|
|
break;
|
|
|
|
} /* switch (char after <SPECIAL_VAR_SYMBOL>) */
|
|
|
|
if (val && val[0]) {
|
|
o_addQstr(output, val);
|
|
}
|
|
free(to_be_freed);
|
|
|
|
/* Restore NULL'ed SPECIAL_VAR_SYMBOL.
|
|
* Do the check to avoid writing to a const string. */
|
|
if (*p != SPECIAL_VAR_SYMBOL)
|
|
*p = SPECIAL_VAR_SYMBOL;
|
|
|
|
#if ENABLE_HUSH_TICK
|
|
o_free(&subst_result);
|
|
#endif
|
|
arg = ++p;
|
|
} /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
|
|
|
|
if (arg[0]) {
|
|
if (ended_in_ifs) {
|
|
o_addchr(output, '\0');
|
|
n = o_save_ptr(output, n);
|
|
}
|
|
debug_print_list("expand_vars_to_list[a]", output, n);
|
|
/* this part is literal, and it was already pre-quoted
|
|
* if needed (much earlier), do not use o_addQstr here! */
|
|
o_addstr_with_NUL(output, arg);
|
|
debug_print_list("expand_vars_to_list[b]", output, n);
|
|
} else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
|
|
&& !(cant_be_null & 0x80) /* and all vars were not quoted. */
|
|
) {
|
|
n--;
|
|
/* allow to reuse list[n] later without re-growth */
|
|
output->has_empty_slot = 1;
|
|
} else {
|
|
o_addchr(output, '\0');
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
static char **expand_variables(char **argv, unsigned expflags)
|
|
{
|
|
int n;
|
|
char **list;
|
|
o_string output = NULL_O_STRING;
|
|
|
|
output.o_expflags = expflags;
|
|
|
|
n = 0;
|
|
while (*argv) {
|
|
n = expand_vars_to_list(&output, n, *argv);
|
|
argv++;
|
|
}
|
|
debug_print_list("expand_variables", &output, n);
|
|
|
|
/* output.data (malloced in one block) gets returned in "list" */
|
|
list = o_finalize_list(&output, n);
|
|
debug_print_strings("expand_variables[1]", list);
|
|
return list;
|
|
}
|
|
|
|
static char **expand_strvec_to_strvec(char **argv)
|
|
{
|
|
return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS);
|
|
}
|
|
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
|
|
{
|
|
return expand_variables(argv, EXP_FLAG_SINGLEWORD);
|
|
}
|
|
#endif
|
|
|
|
/* Used for expansion of right hand of assignments,
|
|
* $((...)), heredocs, variable espansion parts.
|
|
*
|
|
* NB: should NOT do globbing!
|
|
* "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*"
|
|
*/
|
|
static char *expand_string_to_string(const char *str, int do_unbackslash)
|
|
{
|
|
#if !ENABLE_HUSH_BASH_COMPAT
|
|
const int do_unbackslash = 1;
|
|
#endif
|
|
char *argv[2], **list;
|
|
|
|
debug_printf_expand("string_to_string<='%s'\n", str);
|
|
/* This is generally an optimization, but it also
|
|
* handles "", which otherwise trips over !list[0] check below.
|
|
* (is this ever happens that we actually get str="" here?)
|
|
*/
|
|
if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) {
|
|
//TODO: Can use on strings with \ too, just unbackslash() them?
|
|
debug_printf_expand("string_to_string(fast)=>'%s'\n", str);
|
|
return xstrdup(str);
|
|
}
|
|
|
|
argv[0] = (char*)str;
|
|
argv[1] = NULL;
|
|
list = expand_variables(argv, do_unbackslash
|
|
? EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD
|
|
: EXP_FLAG_SINGLEWORD
|
|
);
|
|
if (HUSH_DEBUG)
|
|
if (!list[0] || list[1])
|
|
bb_error_msg_and_die("BUG in varexp2");
|
|
/* actually, just move string 2*sizeof(char*) bytes back */
|
|
overlapping_strcpy((char*)list, list[0]);
|
|
if (do_unbackslash)
|
|
unbackslash((char*)list);
|
|
debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
|
|
return (char*)list;
|
|
}
|
|
|
|
/* Used for "eval" builtin */
|
|
static char* expand_strvec_to_string(char **argv)
|
|
{
|
|
char **list;
|
|
|
|
list = expand_variables(argv, EXP_FLAG_SINGLEWORD);
|
|
/* Convert all NULs to spaces */
|
|
if (list[0]) {
|
|
int n = 1;
|
|
while (list[n]) {
|
|
if (HUSH_DEBUG)
|
|
if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
|
|
bb_error_msg_and_die("BUG in varexp3");
|
|
/* bash uses ' ' regardless of $IFS contents */
|
|
list[n][-1] = ' ';
|
|
n++;
|
|
}
|
|
}
|
|
overlapping_strcpy((char*)list, list[0]);
|
|
debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
|
|
return (char*)list;
|
|
}
|
|
|
|
static char **expand_assignments(char **argv, int count)
|
|
{
|
|
int i;
|
|
char **p;
|
|
|
|
G.expanded_assignments = p = NULL;
|
|
/* Expand assignments into one string each */
|
|
for (i = 0; i < count; i++) {
|
|
G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i], /*unbackslash:*/ 1));
|
|
}
|
|
G.expanded_assignments = NULL;
|
|
return p;
|
|
}
|
|
|
|
|
|
static void switch_off_special_sigs(unsigned mask)
|
|
{
|
|
unsigned sig = 0;
|
|
while ((mask >>= 1) != 0) {
|
|
sig++;
|
|
if (!(mask & 1))
|
|
continue;
|
|
if (G.traps) {
|
|
if (G.traps[sig] && !G.traps[sig][0])
|
|
/* trap is '', has to remain SIG_IGN */
|
|
continue;
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = NULL;
|
|
}
|
|
/* We are here only if no trap or trap was not '' */
|
|
install_sighandler(sig, SIG_DFL);
|
|
}
|
|
}
|
|
|
|
#if BB_MMU
|
|
/* never called */
|
|
void re_execute_shell(char ***to_free, const char *s,
|
|
char *g_argv0, char **g_argv,
|
|
char **builtin_argv) NORETURN;
|
|
|
|
static void reset_traps_to_defaults(void)
|
|
{
|
|
/* This function is always called in a child shell
|
|
* after fork (not vfork, NOMMU doesn't use this function).
|
|
*/
|
|
unsigned sig;
|
|
unsigned mask;
|
|
|
|
/* Child shells are not interactive.
|
|
* SIGTTIN/SIGTTOU/SIGTSTP should not have special handling.
|
|
* Testcase: (while :; do :; done) + ^Z should background.
|
|
* Same goes for SIGTERM, SIGHUP, SIGINT.
|
|
*/
|
|
mask = (G.special_sig_mask & SPECIAL_INTERACTIVE_SIGS) | G_fatal_sig_mask;
|
|
if (!G.traps && !mask)
|
|
return; /* already no traps and no special sigs */
|
|
|
|
/* Switch off special sigs */
|
|
switch_off_special_sigs(mask);
|
|
#if ENABLE_HUSH_JOB
|
|
G_fatal_sig_mask = 0;
|
|
#endif
|
|
G.special_sig_mask &= ~SPECIAL_INTERACTIVE_SIGS;
|
|
/* SIGQUIT,SIGCHLD and maybe SPECIAL_JOBSTOP_SIGS
|
|
* remain set in G.special_sig_mask */
|
|
|
|
if (!G.traps)
|
|
return;
|
|
|
|
/* Reset all sigs to default except ones with empty traps */
|
|
for (sig = 0; sig < NSIG; sig++) {
|
|
if (!G.traps[sig])
|
|
continue; /* no trap: nothing to do */
|
|
if (!G.traps[sig][0])
|
|
continue; /* empty trap: has to remain SIG_IGN */
|
|
/* sig has non-empty trap, reset it: */
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = NULL;
|
|
/* There is no signal for trap 0 (EXIT) */
|
|
if (sig == 0)
|
|
continue;
|
|
install_sighandler(sig, pick_sighandler(sig));
|
|
}
|
|
}
|
|
|
|
#else /* !BB_MMU */
|
|
|
|
static void re_execute_shell(char ***to_free, const char *s,
|
|
char *g_argv0, char **g_argv,
|
|
char **builtin_argv) NORETURN;
|
|
static void re_execute_shell(char ***to_free, const char *s,
|
|
char *g_argv0, char **g_argv,
|
|
char **builtin_argv)
|
|
{
|
|
# define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x"))
|
|
/* delims + 2 * (number of bytes in printed hex numbers) */
|
|
char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)];
|
|
char *heredoc_argv[4];
|
|
struct variable *cur;
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
struct function *funcp;
|
|
# endif
|
|
char **argv, **pp;
|
|
unsigned cnt;
|
|
unsigned long long empty_trap_mask;
|
|
|
|
if (!g_argv0) { /* heredoc */
|
|
argv = heredoc_argv;
|
|
argv[0] = (char *) G.argv0_for_re_execing;
|
|
argv[1] = (char *) "-<";
|
|
argv[2] = (char *) s;
|
|
argv[3] = NULL;
|
|
pp = &argv[3]; /* used as pointer to empty environment */
|
|
goto do_exec;
|
|
}
|
|
|
|
cnt = 0;
|
|
pp = builtin_argv;
|
|
if (pp) while (*pp++)
|
|
cnt++;
|
|
|
|
empty_trap_mask = 0;
|
|
if (G.traps) {
|
|
int sig;
|
|
for (sig = 1; sig < NSIG; sig++) {
|
|
if (G.traps[sig] && !G.traps[sig][0])
|
|
empty_trap_mask |= 1LL << sig;
|
|
}
|
|
}
|
|
|
|
sprintf(param_buf, NOMMU_HACK_FMT
|
|
, (unsigned) G.root_pid
|
|
, (unsigned) G.root_ppid
|
|
, (unsigned) G.last_bg_pid
|
|
, (unsigned) G.last_exitcode
|
|
, cnt
|
|
, empty_trap_mask
|
|
IF_HUSH_LOOPS(, G.depth_of_loop)
|
|
);
|
|
# undef NOMMU_HACK_FMT
|
|
/* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...>
|
|
* 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL
|
|
*/
|
|
cnt += 6;
|
|
for (cur = G.top_var; cur; cur = cur->next) {
|
|
if (!cur->flg_export || cur->flg_read_only)
|
|
cnt += 2;
|
|
}
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
for (funcp = G.top_func; funcp; funcp = funcp->next)
|
|
cnt += 3;
|
|
# endif
|
|
pp = g_argv;
|
|
while (*pp++)
|
|
cnt++;
|
|
*to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
|
|
*pp++ = (char *) G.argv0_for_re_execing;
|
|
*pp++ = param_buf;
|
|
for (cur = G.top_var; cur; cur = cur->next) {
|
|
if (strcmp(cur->varstr, hush_version_str) == 0)
|
|
continue;
|
|
if (cur->flg_read_only) {
|
|
*pp++ = (char *) "-R";
|
|
*pp++ = cur->varstr;
|
|
} else if (!cur->flg_export) {
|
|
*pp++ = (char *) "-V";
|
|
*pp++ = cur->varstr;
|
|
}
|
|
}
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
for (funcp = G.top_func; funcp; funcp = funcp->next) {
|
|
*pp++ = (char *) "-F";
|
|
*pp++ = funcp->name;
|
|
*pp++ = funcp->body_as_string;
|
|
}
|
|
# endif
|
|
/* We can pass activated traps here. Say, -Tnn:trap_string
|
|
*
|
|
* However, POSIX says that subshells reset signals with traps
|
|
* to SIG_DFL.
|
|
* I tested bash-3.2 and it not only does that with true subshells
|
|
* of the form ( list ), but with any forked children shells.
|
|
* I set trap "echo W" WINCH; and then tried:
|
|
*
|
|
* { echo 1; sleep 20; echo 2; } &
|
|
* while true; do echo 1; sleep 20; echo 2; break; done &
|
|
* true | { echo 1; sleep 20; echo 2; } | cat
|
|
*
|
|
* In all these cases sending SIGWINCH to the child shell
|
|
* did not run the trap. If I add trap "echo V" WINCH;
|
|
* _inside_ group (just before echo 1), it works.
|
|
*
|
|
* I conclude it means we don't need to pass active traps here.
|
|
*/
|
|
*pp++ = (char *) "-c";
|
|
*pp++ = (char *) s;
|
|
if (builtin_argv) {
|
|
while (*++builtin_argv)
|
|
*pp++ = *builtin_argv;
|
|
*pp++ = (char *) "";
|
|
}
|
|
*pp++ = g_argv0;
|
|
while (*g_argv)
|
|
*pp++ = *g_argv++;
|
|
/* *pp = NULL; - is already there */
|
|
pp = environ;
|
|
|
|
do_exec:
|
|
debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
|
|
/* Don't propagate SIG_IGN to the child */
|
|
if (SPECIAL_JOBSTOP_SIGS != 0)
|
|
switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
|
execve(bb_busybox_exec_path, argv, pp);
|
|
/* Fallback. Useful for init=/bin/hush usage etc */
|
|
if (argv[0][0] == '/')
|
|
execve(argv[0], argv, pp);
|
|
xfunc_error_retval = 127;
|
|
bb_error_msg_and_die("can't re-execute the shell");
|
|
}
|
|
#endif /* !BB_MMU */
|
|
|
|
|
|
static int run_and_free_list(struct pipe *pi);
|
|
|
|
/* Executing from string: eval, sh -c '...'
|
|
* or from file: /etc/profile, . file, sh <script>, sh (intereactive)
|
|
* end_trigger controls how often we stop parsing
|
|
* NUL: parse all, execute, return
|
|
* ';': parse till ';' or newline, execute, repeat till EOF
|
|
*/
|
|
static void parse_and_run_stream(struct in_str *inp, int end_trigger)
|
|
{
|
|
/* Why we need empty flag?
|
|
* An obscure corner case "false; ``; echo $?":
|
|
* empty command in `` should still set $? to 0.
|
|
* But we can't just set $? to 0 at the start,
|
|
* this breaks "false; echo `echo $?`" case.
|
|
*/
|
|
bool empty = 1;
|
|
while (1) {
|
|
struct pipe *pipe_list;
|
|
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
if (end_trigger == ';')
|
|
inp->promptmode = 0; /* PS1 */
|
|
#endif
|
|
pipe_list = parse_stream(NULL, inp, end_trigger);
|
|
if (!pipe_list || pipe_list == ERR_PTR) { /* EOF/error */
|
|
/* If we are in "big" script
|
|
* (not in `cmd` or something similar)...
|
|
*/
|
|
if (pipe_list == ERR_PTR && end_trigger == ';') {
|
|
/* Discard cached input (rest of line) */
|
|
int ch = inp->last_char;
|
|
while (ch != EOF && ch != '\n') {
|
|
//bb_error_msg("Discarded:'%c'", ch);
|
|
ch = i_getch(inp);
|
|
}
|
|
/* Force prompt */
|
|
inp->p = NULL;
|
|
/* This stream isn't empty */
|
|
empty = 0;
|
|
continue;
|
|
}
|
|
if (!pipe_list && empty)
|
|
G.last_exitcode = 0;
|
|
break;
|
|
}
|
|
debug_print_tree(pipe_list, 0);
|
|
debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
|
|
run_and_free_list(pipe_list);
|
|
empty = 0;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (G.flag_return_in_progress == 1)
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void parse_and_run_string(const char *s)
|
|
{
|
|
struct in_str input;
|
|
setup_string_in_str(&input, s);
|
|
parse_and_run_stream(&input, '\0');
|
|
}
|
|
|
|
static void parse_and_run_file(FILE *f)
|
|
{
|
|
struct in_str input;
|
|
setup_file_in_str(&input, f);
|
|
parse_and_run_stream(&input, ';');
|
|
}
|
|
|
|
#if ENABLE_HUSH_TICK
|
|
static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
|
|
{
|
|
pid_t pid;
|
|
int channel[2];
|
|
# if !BB_MMU
|
|
char **to_free = NULL;
|
|
# endif
|
|
|
|
xpipe(channel);
|
|
pid = BB_MMU ? xfork() : xvfork();
|
|
if (pid == 0) { /* child */
|
|
disable_restore_tty_pgrp_on_exit();
|
|
/* Process substitution is not considered to be usual
|
|
* 'command execution'.
|
|
* SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
|
|
*/
|
|
bb_signals(0
|
|
+ (1 << SIGTSTP)
|
|
+ (1 << SIGTTIN)
|
|
+ (1 << SIGTTOU)
|
|
, SIG_IGN);
|
|
CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
|
|
close(channel[0]); /* NB: close _first_, then move fd! */
|
|
xmove_fd(channel[1], 1);
|
|
/* Prevent it from trying to handle ctrl-z etc */
|
|
IF_HUSH_JOB(G.run_list_level = 1;)
|
|
/* Awful hack for `trap` or $(trap).
|
|
*
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
|
|
* contains an example where "trap" is executed in a subshell:
|
|
*
|
|
* save_traps=$(trap)
|
|
* ...
|
|
* eval "$save_traps"
|
|
*
|
|
* Standard does not say that "trap" in subshell shall print
|
|
* parent shell's traps. It only says that its output
|
|
* must have suitable form, but then, in the above example
|
|
* (which is not supposed to be normative), it implies that.
|
|
*
|
|
* bash (and probably other shell) does implement it
|
|
* (traps are reset to defaults, but "trap" still shows them),
|
|
* but as a result, "trap" logic is hopelessly messed up:
|
|
*
|
|
* # trap
|
|
* trap -- 'echo Ho' SIGWINCH <--- we have a handler
|
|
* # (trap) <--- trap is in subshell - no output (correct, traps are reset)
|
|
* # true | trap <--- trap is in subshell - no output (ditto)
|
|
* # echo `true | trap` <--- in subshell - output (but traps are reset!)
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
* # echo `(trap)` <--- in subshell in subshell - output
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
* # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
*
|
|
* The rules when to forget and when to not forget traps
|
|
* get really complex and nonsensical.
|
|
*
|
|
* Our solution: ONLY bare $(trap) or `trap` is special.
|
|
*/
|
|
s = skip_whitespace(s);
|
|
if (strncmp(s, "trap", 4) == 0
|
|
&& skip_whitespace(s + 4)[0] == '\0'
|
|
) {
|
|
static const char *const argv[] = { NULL, NULL };
|
|
builtin_trap((char**)argv);
|
|
exit(0); /* not _exit() - we need to fflush */
|
|
}
|
|
# if BB_MMU
|
|
reset_traps_to_defaults();
|
|
parse_and_run_string(s);
|
|
_exit(G.last_exitcode);
|
|
# else
|
|
/* We re-execute after vfork on NOMMU. This makes this script safe:
|
|
* yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
|
|
* huge=`cat BIG` # was blocking here forever
|
|
* echo OK
|
|
*/
|
|
re_execute_shell(&to_free,
|
|
s,
|
|
G.global_argv[0],
|
|
G.global_argv + 1,
|
|
NULL);
|
|
# endif
|
|
}
|
|
|
|
/* parent */
|
|
*pid_p = pid;
|
|
# if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in generate_stream_from_string:"
|
|
// " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
|
|
// getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
# endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
# if !BB_MMU
|
|
free(to_free);
|
|
# endif
|
|
close(channel[1]);
|
|
close_on_exec_on(channel[0]);
|
|
return xfdopen_for_read(channel[0]);
|
|
}
|
|
|
|
/* Return code is exit status of the process that is run. */
|
|
static int process_command_subs(o_string *dest, const char *s)
|
|
{
|
|
FILE *fp;
|
|
struct in_str pipe_str;
|
|
pid_t pid;
|
|
int status, ch, eol_cnt;
|
|
|
|
fp = generate_stream_from_string(s, &pid);
|
|
|
|
/* Now send results of command back into original context */
|
|
setup_file_in_str(&pipe_str, fp);
|
|
eol_cnt = 0;
|
|
while ((ch = i_getch(&pipe_str)) != EOF) {
|
|
if (ch == '\n') {
|
|
eol_cnt++;
|
|
continue;
|
|
}
|
|
while (eol_cnt) {
|
|
o_addchr(dest, '\n');
|
|
eol_cnt--;
|
|
}
|
|
o_addQchr(dest, ch);
|
|
}
|
|
|
|
debug_printf("done reading from `cmd` pipe, closing it\n");
|
|
fclose(fp);
|
|
/* We need to extract exitcode. Test case
|
|
* "true; echo `sleep 1; false` $?"
|
|
* should print 1 */
|
|
safe_waitpid(pid, &status, 0);
|
|
debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
|
|
return WEXITSTATUS(status);
|
|
}
|
|
#endif /* ENABLE_HUSH_TICK */
|
|
|
|
|
|
static void setup_heredoc(struct redir_struct *redir)
|
|
{
|
|
struct fd_pair pair;
|
|
pid_t pid;
|
|
int len, written;
|
|
/* the _body_ of heredoc (misleading field name) */
|
|
const char *heredoc = redir->rd_filename;
|
|
char *expanded;
|
|
#if !BB_MMU
|
|
char **to_free;
|
|
#endif
|
|
|
|
expanded = NULL;
|
|
if (!(redir->rd_dup & HEREDOC_QUOTED)) {
|
|
expanded = encode_then_expand_string(heredoc, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
|
if (expanded)
|
|
heredoc = expanded;
|
|
}
|
|
len = strlen(heredoc);
|
|
|
|
close(redir->rd_fd); /* often saves dup2+close in xmove_fd */
|
|
xpiped_pair(pair);
|
|
xmove_fd(pair.rd, redir->rd_fd);
|
|
|
|
/* Try writing without forking. Newer kernels have
|
|
* dynamically growing pipes. Must use non-blocking write! */
|
|
ndelay_on(pair.wr);
|
|
while (1) {
|
|
written = write(pair.wr, heredoc, len);
|
|
if (written <= 0)
|
|
break;
|
|
len -= written;
|
|
if (len == 0) {
|
|
close(pair.wr);
|
|
free(expanded);
|
|
return;
|
|
}
|
|
heredoc += written;
|
|
}
|
|
ndelay_off(pair.wr);
|
|
|
|
/* Okay, pipe buffer was not big enough */
|
|
/* Note: we must not create a stray child (bastard? :)
|
|
* for the unsuspecting parent process. Child creates a grandchild
|
|
* and exits before parent execs the process which consumes heredoc
|
|
* (that exec happens after we return from this function) */
|
|
#if !BB_MMU
|
|
to_free = NULL;
|
|
#endif
|
|
pid = xvfork();
|
|
if (pid == 0) {
|
|
/* child */
|
|
disable_restore_tty_pgrp_on_exit();
|
|
pid = BB_MMU ? xfork() : xvfork();
|
|
if (pid != 0)
|
|
_exit(0);
|
|
/* grandchild */
|
|
close(redir->rd_fd); /* read side of the pipe */
|
|
#if BB_MMU
|
|
full_write(pair.wr, heredoc, len); /* may loop or block */
|
|
_exit(0);
|
|
#else
|
|
/* Delegate blocking writes to another process */
|
|
xmove_fd(pair.wr, STDOUT_FILENO);
|
|
re_execute_shell(&to_free, heredoc, NULL, NULL, NULL);
|
|
#endif
|
|
}
|
|
/* parent */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
#endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
#if !BB_MMU
|
|
free(to_free);
|
|
#endif
|
|
close(pair.wr);
|
|
free(expanded);
|
|
wait(NULL); /* wait till child has died */
|
|
}
|
|
|
|
/* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
|
* and stderr if they are redirected. */
|
|
static int setup_redirects(struct command *prog, int squirrel[])
|
|
{
|
|
int openfd, mode;
|
|
struct redir_struct *redir;
|
|
|
|
for (redir = prog->redirects; redir; redir = redir->next) {
|
|
if (redir->rd_type == REDIRECT_HEREDOC2) {
|
|
/* rd_fd<<HERE case */
|
|
if (squirrel && redir->rd_fd < 3
|
|
&& squirrel[redir->rd_fd] < 0
|
|
) {
|
|
squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
|
}
|
|
/* for REDIRECT_HEREDOC2, rd_filename holds _contents_
|
|
* of the heredoc */
|
|
debug_printf_parse("set heredoc '%s'\n",
|
|
redir->rd_filename);
|
|
setup_heredoc(redir);
|
|
continue;
|
|
}
|
|
|
|
if (redir->rd_dup == REDIRFD_TO_FILE) {
|
|
/* rd_fd<*>file case (<*> is <,>,>>,<>) */
|
|
char *p;
|
|
if (redir->rd_filename == NULL) {
|
|
/* Something went wrong in the parse.
|
|
* Pretend it didn't happen */
|
|
bb_error_msg("bug in redirect parse");
|
|
continue;
|
|
}
|
|
mode = redir_table[redir->rd_type].mode;
|
|
p = expand_string_to_string(redir->rd_filename, /*unbackslash:*/ 1);
|
|
openfd = open_or_warn(p, mode);
|
|
free(p);
|
|
if (openfd < 0) {
|
|
/* this could get lost if stderr has been redirected, but
|
|
* bash and ash both lose it as well (though zsh doesn't!) */
|
|
//what the above comment tries to say?
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* rd_fd<*>rd_dup or rd_fd<*>- cases */
|
|
openfd = redir->rd_dup;
|
|
}
|
|
|
|
if (openfd != redir->rd_fd) {
|
|
if (squirrel && redir->rd_fd < 3
|
|
&& squirrel[redir->rd_fd] < 0
|
|
) {
|
|
squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
|
}
|
|
if (openfd == REDIRFD_CLOSE) {
|
|
/* "n>-" means "close me" */
|
|
close(redir->rd_fd);
|
|
} else {
|
|
xdup2(openfd, redir->rd_fd);
|
|
if (redir->rd_dup == REDIRFD_TO_FILE)
|
|
close(openfd);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void restore_redirects(int squirrel[])
|
|
{
|
|
int i, fd;
|
|
for (i = 0; i < 3; i++) {
|
|
fd = squirrel[i];
|
|
if (fd != -1) {
|
|
/* We simply die on error */
|
|
xmove_fd(fd, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
static char *find_in_path(const char *arg)
|
|
{
|
|
char *ret = NULL;
|
|
const char *PATH = get_local_var_value("PATH");
|
|
|
|
if (!PATH)
|
|
return NULL;
|
|
|
|
while (1) {
|
|
const char *end = strchrnul(PATH, ':');
|
|
int sz = end - PATH; /* must be int! */
|
|
|
|
free(ret);
|
|
if (sz != 0) {
|
|
ret = xasprintf("%.*s/%s", sz, PATH, arg);
|
|
} else {
|
|
/* We have xxx::yyyy in $PATH,
|
|
* it means "use current dir" */
|
|
ret = xstrdup(arg);
|
|
}
|
|
if (access(ret, F_OK) == 0)
|
|
break;
|
|
|
|
if (*end == '\0') {
|
|
free(ret);
|
|
return NULL;
|
|
}
|
|
PATH = end + 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct built_in_command *find_builtin_helper(const char *name,
|
|
const struct built_in_command *x,
|
|
const struct built_in_command *end)
|
|
{
|
|
while (x != end) {
|
|
if (strcmp(name, x->b_cmd) != 0) {
|
|
x++;
|
|
continue;
|
|
}
|
|
debug_printf_exec("found builtin '%s'\n", name);
|
|
return x;
|
|
}
|
|
return NULL;
|
|
}
|
|
static const struct built_in_command *find_builtin1(const char *name)
|
|
{
|
|
return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]);
|
|
}
|
|
static const struct built_in_command *find_builtin(const char *name)
|
|
{
|
|
const struct built_in_command *x = find_builtin1(name);
|
|
if (x)
|
|
return x;
|
|
return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]);
|
|
}
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static struct function **find_function_slot(const char *name)
|
|
{
|
|
struct function **funcpp = &G.top_func;
|
|
while (*funcpp) {
|
|
if (strcmp(name, (*funcpp)->name) == 0) {
|
|
break;
|
|
}
|
|
funcpp = &(*funcpp)->next;
|
|
}
|
|
return funcpp;
|
|
}
|
|
|
|
static const struct function *find_function(const char *name)
|
|
{
|
|
const struct function *funcp = *find_function_slot(name);
|
|
if (funcp)
|
|
debug_printf_exec("found function '%s'\n", name);
|
|
return funcp;
|
|
}
|
|
|
|
/* Note: takes ownership on name ptr */
|
|
static struct function *new_function(char *name)
|
|
{
|
|
struct function **funcpp = find_function_slot(name);
|
|
struct function *funcp = *funcpp;
|
|
|
|
if (funcp != NULL) {
|
|
struct command *cmd = funcp->parent_cmd;
|
|
debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd);
|
|
if (!cmd) {
|
|
debug_printf_exec("freeing & replacing function '%s'\n", funcp->name);
|
|
free(funcp->name);
|
|
/* Note: if !funcp->body, do not free body_as_string!
|
|
* This is a special case of "-F name body" function:
|
|
* body_as_string was not malloced! */
|
|
if (funcp->body) {
|
|
free_pipe_list(funcp->body);
|
|
# if !BB_MMU
|
|
free(funcp->body_as_string);
|
|
# endif
|
|
}
|
|
} else {
|
|
debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name);
|
|
cmd->argv[0] = funcp->name;
|
|
cmd->group = funcp->body;
|
|
# if !BB_MMU
|
|
cmd->group_as_string = funcp->body_as_string;
|
|
# endif
|
|
}
|
|
} else {
|
|
debug_printf_exec("remembering new function '%s'\n", name);
|
|
funcp = *funcpp = xzalloc(sizeof(*funcp));
|
|
/*funcp->next = NULL;*/
|
|
}
|
|
|
|
funcp->name = name;
|
|
return funcp;
|
|
}
|
|
|
|
static void unset_func(const char *name)
|
|
{
|
|
struct function **funcpp = find_function_slot(name);
|
|
struct function *funcp = *funcpp;
|
|
|
|
if (funcp != NULL) {
|
|
debug_printf_exec("freeing function '%s'\n", funcp->name);
|
|
*funcpp = funcp->next;
|
|
/* funcp is unlinked now, deleting it.
|
|
* Note: if !funcp->body, the function was created by
|
|
* "-F name body", do not free ->body_as_string
|
|
* and ->name as they were not malloced. */
|
|
if (funcp->body) {
|
|
free_pipe_list(funcp->body);
|
|
free(funcp->name);
|
|
# if !BB_MMU
|
|
free(funcp->body_as_string);
|
|
# endif
|
|
}
|
|
free(funcp);
|
|
}
|
|
}
|
|
|
|
# if BB_MMU
|
|
#define exec_function(to_free, funcp, argv) \
|
|
exec_function(funcp, argv)
|
|
# endif
|
|
static void exec_function(char ***to_free,
|
|
const struct function *funcp,
|
|
char **argv) NORETURN;
|
|
static void exec_function(char ***to_free,
|
|
const struct function *funcp,
|
|
char **argv)
|
|
{
|
|
# if BB_MMU
|
|
int n = 1;
|
|
|
|
argv[0] = G.global_argv[0];
|
|
G.global_argv = argv;
|
|
while (*++argv)
|
|
n++;
|
|
G.global_argc = n;
|
|
/* On MMU, funcp->body is always non-NULL */
|
|
n = run_list(funcp->body);
|
|
fflush_all();
|
|
_exit(n);
|
|
# else
|
|
re_execute_shell(to_free,
|
|
funcp->body_as_string,
|
|
G.global_argv[0],
|
|
argv + 1,
|
|
NULL);
|
|
# endif
|
|
}
|
|
|
|
static int run_function(const struct function *funcp, char **argv)
|
|
{
|
|
int rc;
|
|
save_arg_t sv;
|
|
smallint sv_flg;
|
|
|
|
save_and_replace_G_args(&sv, argv);
|
|
|
|
/* "we are in function, ok to use return" */
|
|
sv_flg = G.flag_return_in_progress;
|
|
G.flag_return_in_progress = -1;
|
|
# if ENABLE_HUSH_LOCAL
|
|
G.func_nest_level++;
|
|
# endif
|
|
|
|
/* On MMU, funcp->body is always non-NULL */
|
|
# if !BB_MMU
|
|
if (!funcp->body) {
|
|
/* Function defined by -F */
|
|
parse_and_run_string(funcp->body_as_string);
|
|
rc = G.last_exitcode;
|
|
} else
|
|
# endif
|
|
{
|
|
rc = run_list(funcp->body);
|
|
}
|
|
|
|
# if ENABLE_HUSH_LOCAL
|
|
{
|
|
struct variable *var;
|
|
struct variable **var_pp;
|
|
|
|
var_pp = &G.top_var;
|
|
while ((var = *var_pp) != NULL) {
|
|
if (var->func_nest_level < G.func_nest_level) {
|
|
var_pp = &var->next;
|
|
continue;
|
|
}
|
|
/* Unexport */
|
|
if (var->flg_export)
|
|
bb_unsetenv(var->varstr);
|
|
/* Remove from global list */
|
|
*var_pp = var->next;
|
|
/* Free */
|
|
if (!var->max_len)
|
|
free(var->varstr);
|
|
free(var);
|
|
}
|
|
G.func_nest_level--;
|
|
}
|
|
# endif
|
|
G.flag_return_in_progress = sv_flg;
|
|
|
|
restore_G_args(&sv, argv);
|
|
|
|
return rc;
|
|
}
|
|
#endif /* ENABLE_HUSH_FUNCTIONS */
|
|
|
|
|
|
#if BB_MMU
|
|
#define exec_builtin(to_free, x, argv) \
|
|
exec_builtin(x, argv)
|
|
#else
|
|
#define exec_builtin(to_free, x, argv) \
|
|
exec_builtin(to_free, argv)
|
|
#endif
|
|
static void exec_builtin(char ***to_free,
|
|
const struct built_in_command *x,
|
|
char **argv) NORETURN;
|
|
static void exec_builtin(char ***to_free,
|
|
const struct built_in_command *x,
|
|
char **argv)
|
|
{
|
|
#if BB_MMU
|
|
int rcode;
|
|
fflush_all();
|
|
rcode = x->b_function(argv);
|
|
fflush_all();
|
|
_exit(rcode);
|
|
#else
|
|
fflush_all();
|
|
/* On NOMMU, we must never block!
|
|
* Example: { sleep 99 | read line; } & echo Ok
|
|
*/
|
|
re_execute_shell(to_free,
|
|
argv[0],
|
|
G.global_argv[0],
|
|
G.global_argv + 1,
|
|
argv);
|
|
#endif
|
|
}
|
|
|
|
|
|
static void execvp_or_die(char **argv) NORETURN;
|
|
static void execvp_or_die(char **argv)
|
|
{
|
|
debug_printf_exec("execing '%s'\n", argv[0]);
|
|
/* Don't propagate SIG_IGN to the child */
|
|
if (SPECIAL_JOBSTOP_SIGS != 0)
|
|
switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
|
execvp(argv[0], argv);
|
|
bb_perror_msg("can't execute '%s'", argv[0]);
|
|
_exit(127); /* bash compat */
|
|
}
|
|
|
|
#if ENABLE_HUSH_MODE_X
|
|
static void dump_cmd_in_x_mode(char **argv)
|
|
{
|
|
if (G_x_mode && argv) {
|
|
/* We want to output the line in one write op */
|
|
char *buf, *p;
|
|
int len;
|
|
int n;
|
|
|
|
len = 3;
|
|
n = 0;
|
|
while (argv[n])
|
|
len += strlen(argv[n++]) + 1;
|
|
buf = xmalloc(len);
|
|
buf[0] = '+';
|
|
p = buf + 1;
|
|
n = 0;
|
|
while (argv[n])
|
|
p += sprintf(p, " %s", argv[n++]);
|
|
*p++ = '\n';
|
|
*p = '\0';
|
|
fputs(buf, stderr);
|
|
free(buf);
|
|
}
|
|
}
|
|
#else
|
|
# define dump_cmd_in_x_mode(argv) ((void)0)
|
|
#endif
|
|
|
|
#if BB_MMU
|
|
#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
|
|
pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
|
|
#define pseudo_exec(nommu_save, command, argv_expanded) \
|
|
pseudo_exec(command, argv_expanded)
|
|
#endif
|
|
|
|
/* Called after [v]fork() in run_pipe, or from builtin_exec.
|
|
* Never returns.
|
|
* Don't exit() here. If you don't exec, use _exit instead.
|
|
* The at_exit handlers apparently confuse the calling process,
|
|
* in particular stdin handling. Not sure why? -- because of vfork! (vda) */
|
|
static void pseudo_exec_argv(nommu_save_t *nommu_save,
|
|
char **argv, int assignment_cnt,
|
|
char **argv_expanded) NORETURN;
|
|
static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
|
|
char **argv, int assignment_cnt,
|
|
char **argv_expanded)
|
|
{
|
|
char **new_env;
|
|
|
|
new_env = expand_assignments(argv, assignment_cnt);
|
|
dump_cmd_in_x_mode(new_env);
|
|
|
|
if (!argv[assignment_cnt]) {
|
|
/* Case when we are here: ... | var=val | ...
|
|
* (note that we do not exit early, i.e., do not optimize out
|
|
* expand_assignments(): think about ... | var=`sleep 1` | ...
|
|
*/
|
|
free_strings(new_env);
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
#if BB_MMU
|
|
set_vars_and_save_old(new_env);
|
|
free(new_env); /* optional */
|
|
/* we can also destroy set_vars_and_save_old's return value,
|
|
* to save memory */
|
|
#else
|
|
nommu_save->new_env = new_env;
|
|
nommu_save->old_vars = set_vars_and_save_old(new_env);
|
|
#endif
|
|
|
|
if (argv_expanded) {
|
|
argv = argv_expanded;
|
|
} else {
|
|
argv = expand_strvec_to_strvec(argv + assignment_cnt);
|
|
#if !BB_MMU
|
|
nommu_save->argv = argv;
|
|
#endif
|
|
}
|
|
dump_cmd_in_x_mode(argv);
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
|
if (strchr(argv[0], '/') != NULL)
|
|
goto skip;
|
|
#endif
|
|
|
|
/* Check if the command matches any of the builtins.
|
|
* Depending on context, this might be redundant. But it's
|
|
* easier to waste a few CPU cycles than it is to figure out
|
|
* if this is one of those cases.
|
|
*/
|
|
{
|
|
/* On NOMMU, it is more expensive to re-execute shell
|
|
* just in order to run echo or test builtin.
|
|
* It's better to skip it here and run corresponding
|
|
* non-builtin later. */
|
|
const struct built_in_command *x;
|
|
x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]);
|
|
if (x) {
|
|
exec_builtin(&nommu_save->argv_from_re_execing, x, argv);
|
|
}
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
/* Check if the command matches any functions */
|
|
{
|
|
const struct function *funcp = find_function(argv[0]);
|
|
if (funcp) {
|
|
exec_function(&nommu_save->argv_from_re_execing, funcp, argv);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
/* Check if the command matches any busybox applets */
|
|
{
|
|
int a = find_applet_by_name(argv[0]);
|
|
if (a >= 0) {
|
|
# if BB_MMU /* see above why on NOMMU it is not allowed */
|
|
if (APPLET_IS_NOEXEC(a)) {
|
|
debug_printf_exec("running applet '%s'\n", argv[0]);
|
|
run_applet_no_and_exit(a, argv);
|
|
}
|
|
# endif
|
|
/* Re-exec ourselves */
|
|
debug_printf_exec("re-execing applet '%s'\n", argv[0]);
|
|
/* Don't propagate SIG_IGN to the child */
|
|
if (SPECIAL_JOBSTOP_SIGS != 0)
|
|
switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
|
execv(bb_busybox_exec_path, argv);
|
|
/* If they called chroot or otherwise made the binary no longer
|
|
* executable, fall through */
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
|
skip:
|
|
#endif
|
|
execvp_or_die(argv);
|
|
}
|
|
|
|
/* Called after [v]fork() in run_pipe
|
|
*/
|
|
static void pseudo_exec(nommu_save_t *nommu_save,
|
|
struct command *command,
|
|
char **argv_expanded) NORETURN;
|
|
static void pseudo_exec(nommu_save_t *nommu_save,
|
|
struct command *command,
|
|
char **argv_expanded)
|
|
{
|
|
if (command->argv) {
|
|
pseudo_exec_argv(nommu_save, command->argv,
|
|
command->assignment_cnt, argv_expanded);
|
|
}
|
|
|
|
if (command->group) {
|
|
/* Cases when we are here:
|
|
* ( list )
|
|
* { list } &
|
|
* ... | ( list ) | ...
|
|
* ... | { list } | ...
|
|
*/
|
|
#if BB_MMU
|
|
int rcode;
|
|
debug_printf_exec("pseudo_exec: run_list\n");
|
|
reset_traps_to_defaults();
|
|
rcode = run_list(command->group);
|
|
/* OK to leak memory by not calling free_pipe_list,
|
|
* since this process is about to exit */
|
|
_exit(rcode);
|
|
#else
|
|
re_execute_shell(&nommu_save->argv_from_re_execing,
|
|
command->group_as_string,
|
|
G.global_argv[0],
|
|
G.global_argv + 1,
|
|
NULL);
|
|
#endif
|
|
}
|
|
|
|
/* Case when we are here: ... | >file */
|
|
debug_printf_exec("pseudo_exec'ed null command\n");
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static const char *get_cmdtext(struct pipe *pi)
|
|
{
|
|
char **argv;
|
|
char *p;
|
|
int len;
|
|
|
|
/* This is subtle. ->cmdtext is created only on first backgrounding.
|
|
* (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
|
|
* On subsequent bg argv is trashed, but we won't use it */
|
|
if (pi->cmdtext)
|
|
return pi->cmdtext;
|
|
argv = pi->cmds[0].argv;
|
|
if (!argv || !argv[0]) {
|
|
pi->cmdtext = xzalloc(1);
|
|
return pi->cmdtext;
|
|
}
|
|
|
|
len = 0;
|
|
do {
|
|
len += strlen(*argv) + 1;
|
|
} while (*++argv);
|
|
p = xmalloc(len);
|
|
pi->cmdtext = p;
|
|
argv = pi->cmds[0].argv;
|
|
do {
|
|
len = strlen(*argv);
|
|
memcpy(p, *argv, len);
|
|
p += len;
|
|
*p++ = ' ';
|
|
} while (*++argv);
|
|
p[-1] = '\0';
|
|
return pi->cmdtext;
|
|
}
|
|
|
|
static void insert_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *job, **jobp;
|
|
int i;
|
|
|
|
/* Linear search for the ID of the job to use */
|
|
pi->jobid = 1;
|
|
for (job = G.job_list; job; job = job->next)
|
|
if (job->jobid >= pi->jobid)
|
|
pi->jobid = job->jobid + 1;
|
|
|
|
/* Add job to the list of running jobs */
|
|
jobp = &G.job_list;
|
|
while ((job = *jobp) != NULL)
|
|
jobp = &job->next;
|
|
job = *jobp = xmalloc(sizeof(*job));
|
|
|
|
*job = *pi; /* physical copy */
|
|
job->next = NULL;
|
|
job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
|
|
/* Cannot copy entire pi->cmds[] vector! This causes double frees */
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
job->cmds[i].pid = pi->cmds[i].pid;
|
|
/* all other fields are not used and stay zero */
|
|
}
|
|
job->cmdtext = xstrdup(get_cmdtext(pi));
|
|
|
|
if (G_interactive_fd)
|
|
printf("[%d] %d %s\n", job->jobid, job->cmds[0].pid, job->cmdtext);
|
|
G.last_jobid = job->jobid;
|
|
}
|
|
|
|
static void remove_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *prev_pipe;
|
|
|
|
if (pi == G.job_list) {
|
|
G.job_list = pi->next;
|
|
} else {
|
|
prev_pipe = G.job_list;
|
|
while (prev_pipe->next != pi)
|
|
prev_pipe = prev_pipe->next;
|
|
prev_pipe->next = pi->next;
|
|
}
|
|
if (G.job_list)
|
|
G.last_jobid = G.job_list->jobid;
|
|
else
|
|
G.last_jobid = 0;
|
|
}
|
|
|
|
/* Remove a backgrounded job */
|
|
static void delete_finished_bg_job(struct pipe *pi)
|
|
{
|
|
remove_bg_job(pi);
|
|
free_pipe(pi);
|
|
}
|
|
#endif /* JOB */
|
|
|
|
/* Check to see if any processes have exited -- if they
|
|
* have, figure out why and see if a job has completed */
|
|
static int checkjobs(struct pipe *fg_pipe)
|
|
{
|
|
int attributes;
|
|
int status;
|
|
#if ENABLE_HUSH_JOB
|
|
struct pipe *pi;
|
|
#endif
|
|
pid_t childpid;
|
|
int rcode = 0;
|
|
|
|
debug_printf_jobs("checkjobs %p\n", fg_pipe);
|
|
|
|
attributes = WUNTRACED;
|
|
if (fg_pipe == NULL)
|
|
attributes |= WNOHANG;
|
|
|
|
errno = 0;
|
|
#if ENABLE_HUSH_FAST
|
|
if (G.handled_SIGCHLD == G.count_SIGCHLD) {
|
|
//bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p",
|
|
//getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe);
|
|
/* There was neither fork nor SIGCHLD since last waitpid */
|
|
/* Avoid doing waitpid syscall if possible */
|
|
if (!G.we_have_children) {
|
|
errno = ECHILD;
|
|
return -1;
|
|
}
|
|
if (fg_pipe == NULL) { /* is WNOHANG set? */
|
|
/* We have children, but they did not exit
|
|
* or stop yet (we saw no SIGCHLD) */
|
|
return 0;
|
|
}
|
|
/* else: !WNOHANG, waitpid will block, can't short-circuit */
|
|
}
|
|
#endif
|
|
|
|
/* Do we do this right?
|
|
* bash-3.00# sleep 20 | false
|
|
* <ctrl-Z pressed>
|
|
* [3]+ Stopped sleep 20 | false
|
|
* bash-3.00# echo $?
|
|
* 1 <========== bg pipe is not fully done, but exitcode is already known!
|
|
* [hush 1.14.0: yes we do it right]
|
|
*/
|
|
wait_more:
|
|
while (1) {
|
|
int i;
|
|
int dead;
|
|
|
|
#if ENABLE_HUSH_FAST
|
|
i = G.count_SIGCHLD;
|
|
#endif
|
|
childpid = waitpid(-1, &status, attributes);
|
|
if (childpid <= 0) {
|
|
if (childpid && errno != ECHILD)
|
|
bb_perror_msg("waitpid");
|
|
#if ENABLE_HUSH_FAST
|
|
else { /* Until next SIGCHLD, waitpid's are useless */
|
|
G.we_have_children = (childpid == 0);
|
|
G.handled_SIGCHLD = i;
|
|
//bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
dead = WIFEXITED(status) || WIFSIGNALED(status);
|
|
|
|
#if DEBUG_JOBS
|
|
if (WIFSTOPPED(status))
|
|
debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
|
|
childpid, WSTOPSIG(status), WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
|
|
childpid, WTERMSIG(status), WEXITSTATUS(status));
|
|
if (WIFEXITED(status))
|
|
debug_printf_jobs("pid %d exited, exitcode %d\n",
|
|
childpid, WEXITSTATUS(status));
|
|
#endif
|
|
/* Were we asked to wait for fg pipe? */
|
|
if (fg_pipe) {
|
|
i = fg_pipe->num_cmds;
|
|
while (--i >= 0) {
|
|
debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
|
|
if (fg_pipe->cmds[i].pid != childpid)
|
|
continue;
|
|
if (dead) {
|
|
int ex;
|
|
fg_pipe->cmds[i].pid = 0;
|
|
fg_pipe->alive_cmds--;
|
|
ex = WEXITSTATUS(status);
|
|
/* bash prints killer signal's name for *last*
|
|
* process in pipe (prints just newline for SIGINT/SIGPIPE).
|
|
* Mimic this. Example: "sleep 5" + (^\ or kill -QUIT)
|
|
*/
|
|
if (WIFSIGNALED(status)) {
|
|
int sig = WTERMSIG(status);
|
|
if (i == fg_pipe->num_cmds-1)
|
|
/* TODO: use strsignal() instead for bash compat? but that's bloat... */
|
|
printf("%s\n", sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
|
|
/* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
|
|
/* TODO: MIPS has 128 sigs (1..128), what if sig==128 here?
|
|
* Maybe we need to use sig | 128? */
|
|
ex = sig + 128;
|
|
}
|
|
fg_pipe->cmds[i].cmd_exitcode = ex;
|
|
} else {
|
|
fg_pipe->cmds[i].is_stopped = 1;
|
|
fg_pipe->stopped_cmds++;
|
|
}
|
|
debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
|
|
fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
|
|
if (fg_pipe->alive_cmds == fg_pipe->stopped_cmds) {
|
|
/* All processes in fg pipe have exited or stopped */
|
|
i = fg_pipe->num_cmds;
|
|
while (--i >= 0) {
|
|
rcode = fg_pipe->cmds[i].cmd_exitcode;
|
|
/* usually last process gives overall exitstatus,
|
|
* but with "set -o pipefail", last *failed* process does */
|
|
if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
|
|
break;
|
|
}
|
|
IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
|
|
/* Note: *non-interactive* bash does not continue if all processes in fg pipe
|
|
* are stopped. Testcase: "cat | cat" in a script (not on command line!)
|
|
* and "killall -STOP cat" */
|
|
if (G_interactive_fd) {
|
|
#if ENABLE_HUSH_JOB
|
|
if (fg_pipe->alive_cmds != 0)
|
|
insert_bg_job(fg_pipe);
|
|
#endif
|
|
return rcode;
|
|
}
|
|
if (fg_pipe->alive_cmds == 0)
|
|
return rcode;
|
|
}
|
|
/* There are still running processes in the fg pipe */
|
|
goto wait_more; /* do waitpid again */
|
|
}
|
|
/* it wasnt fg_pipe, look for process in bg pipes */
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* We asked to wait for bg or orphaned children */
|
|
/* No need to remember exitcode in this case */
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
if (pi->cmds[i].pid == childpid)
|
|
goto found_pi_and_prognum;
|
|
}
|
|
}
|
|
/* Happens when shell is used as init process (init=/bin/sh) */
|
|
debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
|
|
continue; /* do waitpid again */
|
|
|
|
found_pi_and_prognum:
|
|
if (dead) {
|
|
/* child exited */
|
|
pi->cmds[i].pid = 0;
|
|
pi->alive_cmds--;
|
|
if (!pi->alive_cmds) {
|
|
if (G_interactive_fd)
|
|
printf(JOB_STATUS_FORMAT, pi->jobid,
|
|
"Done", pi->cmdtext);
|
|
delete_finished_bg_job(pi);
|
|
}
|
|
} else {
|
|
/* child stopped */
|
|
pi->cmds[i].is_stopped = 1;
|
|
pi->stopped_cmds++;
|
|
}
|
|
#endif
|
|
} /* while (waitpid succeeds)... */
|
|
|
|
return rcode;
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static int checkjobs_and_fg_shell(struct pipe *fg_pipe)
|
|
{
|
|
pid_t p;
|
|
int rcode = checkjobs(fg_pipe);
|
|
if (G_saved_tty_pgrp) {
|
|
/* Job finished, move the shell to the foreground */
|
|
p = getpgrp(); /* our process group id */
|
|
debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p);
|
|
tcsetpgrp(G_interactive_fd, p);
|
|
}
|
|
return rcode;
|
|
}
|
|
#endif
|
|
|
|
/* Start all the jobs, but don't wait for anything to finish.
|
|
* See checkjobs().
|
|
*
|
|
* Return code is normally -1, when the caller has to wait for children
|
|
* to finish to determine the exit status of the pipe. If the pipe
|
|
* is a simple builtin command, however, the action is done by the
|
|
* time run_pipe returns, and the exit code is provided as the
|
|
* return value.
|
|
*
|
|
* Returns -1 only if started some children. IOW: we have to
|
|
* mask out retvals of builtins etc with 0xff!
|
|
*
|
|
* The only case when we do not need to [v]fork is when the pipe
|
|
* is single, non-backgrounded, non-subshell command. Examples:
|
|
* cmd ; ... { list } ; ...
|
|
* cmd && ... { list } && ...
|
|
* cmd || ... { list } || ...
|
|
* If it is, then we can run cmd as a builtin, NOFORK,
|
|
* or (if SH_STANDALONE) an applet, and we can run the { list }
|
|
* with run_list. If it isn't one of these, we fork and exec cmd.
|
|
*
|
|
* Cases when we must fork:
|
|
* non-single: cmd | cmd
|
|
* backgrounded: cmd & { list } &
|
|
* subshell: ( list ) [&]
|
|
*/
|
|
#if !ENABLE_HUSH_MODE_X
|
|
#define redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel, argv_expanded) \
|
|
redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel)
|
|
#endif
|
|
static int redirect_and_varexp_helper(char ***new_env_p,
|
|
struct variable **old_vars_p,
|
|
struct command *command,
|
|
int squirrel[3],
|
|
char **argv_expanded)
|
|
{
|
|
/* setup_redirects acts on file descriptors, not FILEs.
|
|
* This is perfect for work that comes after exec().
|
|
* Is it really safe for inline use? Experimentally,
|
|
* things seem to work. */
|
|
int rcode = setup_redirects(command, squirrel);
|
|
if (rcode == 0) {
|
|
char **new_env = expand_assignments(command->argv, command->assignment_cnt);
|
|
*new_env_p = new_env;
|
|
dump_cmd_in_x_mode(new_env);
|
|
dump_cmd_in_x_mode(argv_expanded);
|
|
if (old_vars_p)
|
|
*old_vars_p = set_vars_and_save_old(new_env);
|
|
}
|
|
return rcode;
|
|
}
|
|
static NOINLINE int run_pipe(struct pipe *pi)
|
|
{
|
|
static const char *const null_ptr = NULL;
|
|
|
|
int cmd_no;
|
|
int next_infd;
|
|
struct command *command;
|
|
char **argv_expanded;
|
|
char **argv;
|
|
/* it is not always needed, but we aim to smaller code */
|
|
int squirrel[] = { -1, -1, -1 };
|
|
int rcode;
|
|
|
|
debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
|
|
debug_enter();
|
|
|
|
/* Testcase: set -- q w e; (IFS='' echo "$*"; IFS=''; echo "$*"); echo "$*"
|
|
* Result should be 3 lines: q w e, qwe, q w e
|
|
*/
|
|
G.ifs = get_local_var_value("IFS");
|
|
if (!G.ifs)
|
|
G.ifs = defifs;
|
|
|
|
IF_HUSH_JOB(pi->pgrp = -1;)
|
|
pi->stopped_cmds = 0;
|
|
command = &pi->cmds[0];
|
|
argv_expanded = NULL;
|
|
|
|
if (pi->num_cmds != 1
|
|
|| pi->followup == PIPE_BG
|
|
|| command->cmd_type == CMD_SUBSHELL
|
|
) {
|
|
goto must_fork;
|
|
}
|
|
|
|
pi->alive_cmds = 1;
|
|
|
|
debug_printf_exec(": group:%p argv:'%s'\n",
|
|
command->group, command->argv ? command->argv[0] : "NONE");
|
|
|
|
if (command->group) {
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (command->cmd_type == CMD_FUNCDEF) {
|
|
/* "executing" func () { list } */
|
|
struct function *funcp;
|
|
|
|
funcp = new_function(command->argv[0]);
|
|
/* funcp->name is already set to argv[0] */
|
|
funcp->body = command->group;
|
|
# if !BB_MMU
|
|
funcp->body_as_string = command->group_as_string;
|
|
command->group_as_string = NULL;
|
|
# endif
|
|
command->group = NULL;
|
|
command->argv[0] = NULL;
|
|
debug_printf_exec("cmd %p has child func at %p\n", command, funcp);
|
|
funcp->parent_cmd = command;
|
|
command->child_func = funcp;
|
|
|
|
debug_printf_exec("run_pipe: return EXIT_SUCCESS\n");
|
|
debug_leave();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
/* { list } */
|
|
debug_printf("non-subshell group\n");
|
|
rcode = 1; /* exitcode if redir failed */
|
|
if (setup_redirects(command, squirrel) == 0) {
|
|
debug_printf_exec(": run_list\n");
|
|
rcode = run_list(command->group) & 0xff;
|
|
}
|
|
restore_redirects(squirrel);
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe: return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
argv = command->argv ? command->argv : (char **) &null_ptr;
|
|
{
|
|
const struct built_in_command *x;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
const struct function *funcp;
|
|
#else
|
|
enum { funcp = 0 };
|
|
#endif
|
|
char **new_env = NULL;
|
|
struct variable *old_vars = NULL;
|
|
|
|
if (argv[command->assignment_cnt] == NULL) {
|
|
/* Assignments, but no command */
|
|
/* Ensure redirects take effect (that is, create files).
|
|
* Try "a=t >file" */
|
|
#if 0 /* A few cases in testsuite fail with this code. FIXME */
|
|
rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, squirrel, /*argv_expanded:*/ NULL);
|
|
/* Set shell variables */
|
|
if (new_env) {
|
|
argv = new_env;
|
|
while (*argv) {
|
|
set_local_var(*argv, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
|
/* Do we need to flag set_local_var() errors?
|
|
* "assignment to readonly var" and "putenv error"
|
|
*/
|
|
argv++;
|
|
}
|
|
}
|
|
/* Redirect error sets $? to 1. Otherwise,
|
|
* if evaluating assignment value set $?, retain it.
|
|
* Try "false; q=`exit 2`; echo $?" - should print 2: */
|
|
if (rcode == 0)
|
|
rcode = G.last_exitcode;
|
|
/* Exit, _skipping_ variable restoring code: */
|
|
goto clean_up_and_ret0;
|
|
|
|
#else /* Older, bigger, but more correct code */
|
|
|
|
rcode = setup_redirects(command, squirrel);
|
|
restore_redirects(squirrel);
|
|
/* Set shell variables */
|
|
if (G_x_mode)
|
|
bb_putchar_stderr('+');
|
|
while (*argv) {
|
|
char *p = expand_string_to_string(*argv, /*unbackslash:*/ 1);
|
|
if (G_x_mode)
|
|
fprintf(stderr, " %s", p);
|
|
debug_printf_exec("set shell var:'%s'->'%s'\n",
|
|
*argv, p);
|
|
set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
|
/* Do we need to flag set_local_var() errors?
|
|
* "assignment to readonly var" and "putenv error"
|
|
*/
|
|
argv++;
|
|
}
|
|
if (G_x_mode)
|
|
bb_putchar_stderr('\n');
|
|
/* Redirect error sets $? to 1. Otherwise,
|
|
* if evaluating assignment value set $?, retain it.
|
|
* Try "false; q=`exit 2`; echo $?" - should print 2: */
|
|
if (rcode == 0)
|
|
rcode = G.last_exitcode;
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe: return %d\n", rcode);
|
|
return rcode;
|
|
#endif
|
|
}
|
|
|
|
/* Expand the rest into (possibly) many strings each */
|
|
#if ENABLE_HUSH_BASH_COMPAT
|
|
if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) {
|
|
argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt);
|
|
} else
|
|
#endif
|
|
{
|
|
argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
|
|
}
|
|
|
|
/* if someone gives us an empty string: `cmd with empty output` */
|
|
if (!argv_expanded[0]) {
|
|
free(argv_expanded);
|
|
debug_leave();
|
|
return G.last_exitcode;
|
|
}
|
|
|
|
x = find_builtin(argv_expanded[0]);
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
funcp = NULL;
|
|
if (!x)
|
|
funcp = find_function(argv_expanded[0]);
|
|
#endif
|
|
if (x || funcp) {
|
|
if (!funcp) {
|
|
if (x->b_function == builtin_exec && argv_expanded[1] == NULL) {
|
|
debug_printf("exec with redirects only\n");
|
|
rcode = setup_redirects(command, NULL);
|
|
goto clean_up_and_ret1;
|
|
}
|
|
}
|
|
rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
|
|
if (rcode == 0) {
|
|
if (!funcp) {
|
|
debug_printf_exec(": builtin '%s' '%s'...\n",
|
|
x->b_cmd, argv_expanded[1]);
|
|
fflush_all();
|
|
rcode = x->b_function(argv_expanded) & 0xff;
|
|
fflush_all();
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else {
|
|
# if ENABLE_HUSH_LOCAL
|
|
struct variable **sv;
|
|
sv = G.shadowed_vars_pp;
|
|
G.shadowed_vars_pp = &old_vars;
|
|
# endif
|
|
debug_printf_exec(": function '%s' '%s'...\n",
|
|
funcp->name, argv_expanded[1]);
|
|
rcode = run_function(funcp, argv_expanded) & 0xff;
|
|
# if ENABLE_HUSH_LOCAL
|
|
G.shadowed_vars_pp = sv;
|
|
# endif
|
|
}
|
|
#endif
|
|
}
|
|
clean_up_and_ret:
|
|
unset_vars(new_env);
|
|
add_vars(old_vars);
|
|
/* clean_up_and_ret0: */
|
|
restore_redirects(squirrel);
|
|
clean_up_and_ret1:
|
|
free(argv_expanded);
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
if (ENABLE_FEATURE_SH_NOFORK) {
|
|
int n = find_applet_by_name(argv_expanded[0]);
|
|
if (n >= 0 && APPLET_IS_NOFORK(n)) {
|
|
rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
|
|
if (rcode == 0) {
|
|
debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
|
|
argv_expanded[0], argv_expanded[1]);
|
|
rcode = run_nofork_applet(n, argv_expanded);
|
|
}
|
|
goto clean_up_and_ret;
|
|
}
|
|
}
|
|
/* It is neither builtin nor applet. We must fork. */
|
|
}
|
|
|
|
must_fork:
|
|
/* NB: argv_expanded may already be created, and that
|
|
* might include `cmd` runs! Do not rerun it! We *must*
|
|
* use argv_expanded if it's non-NULL */
|
|
|
|
/* Going to fork a child per each pipe member */
|
|
pi->alive_cmds = 0;
|
|
next_infd = 0;
|
|
|
|
cmd_no = 0;
|
|
while (cmd_no < pi->num_cmds) {
|
|
struct fd_pair pipefds;
|
|
#if !BB_MMU
|
|
volatile nommu_save_t nommu_save;
|
|
nommu_save.new_env = NULL;
|
|
nommu_save.old_vars = NULL;
|
|
nommu_save.argv = NULL;
|
|
nommu_save.argv_from_re_execing = NULL;
|
|
#endif
|
|
command = &pi->cmds[cmd_no];
|
|
cmd_no++;
|
|
if (command->argv) {
|
|
debug_printf_exec(": pipe member '%s' '%s'...\n",
|
|
command->argv[0], command->argv[1]);
|
|
} else {
|
|
debug_printf_exec(": pipe member with no argv\n");
|
|
}
|
|
|
|
/* pipes are inserted between pairs of commands */
|
|
pipefds.rd = 0;
|
|
pipefds.wr = 1;
|
|
if (cmd_no < pi->num_cmds)
|
|
xpiped_pair(pipefds);
|
|
|
|
command->pid = BB_MMU ? fork() : vfork();
|
|
if (!command->pid) { /* child */
|
|
#if ENABLE_HUSH_JOB
|
|
disable_restore_tty_pgrp_on_exit();
|
|
CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
|
|
|
|
/* Every child adds itself to new process group
|
|
* with pgid == pid_of_first_child_in_pipe */
|
|
if (G.run_list_level == 1 && G_interactive_fd) {
|
|
pid_t pgrp;
|
|
pgrp = pi->pgrp;
|
|
if (pgrp < 0) /* true for 1st process only */
|
|
pgrp = getpid();
|
|
if (setpgid(0, pgrp) == 0
|
|
&& pi->followup != PIPE_BG
|
|
&& G_saved_tty_pgrp /* we have ctty */
|
|
) {
|
|
/* We do it in *every* child, not just first,
|
|
* to avoid races */
|
|
tcsetpgrp(G_interactive_fd, pgrp);
|
|
}
|
|
}
|
|
#endif
|
|
if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) {
|
|
/* 1st cmd in backgrounded pipe
|
|
* should have its stdin /dev/null'ed */
|
|
close(0);
|
|
if (open(bb_dev_null, O_RDONLY))
|
|
xopen("/", O_RDONLY);
|
|
} else {
|
|
xmove_fd(next_infd, 0);
|
|
}
|
|
xmove_fd(pipefds.wr, 1);
|
|
if (pipefds.rd > 1)
|
|
close(pipefds.rd);
|
|
/* Like bash, explicit redirects override pipes,
|
|
* and the pipe fd is available for dup'ing. */
|
|
if (setup_redirects(command, NULL))
|
|
_exit(1);
|
|
|
|
/* Stores to nommu_save list of env vars putenv'ed
|
|
* (NOMMU, on MMU we don't need that) */
|
|
/* cast away volatility... */
|
|
pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
|
|
/* pseudo_exec() does not return */
|
|
}
|
|
|
|
/* parent or error */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
#endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
#if !BB_MMU
|
|
/* Clean up after vforked child */
|
|
free(nommu_save.argv);
|
|
free(nommu_save.argv_from_re_execing);
|
|
unset_vars(nommu_save.new_env);
|
|
add_vars(nommu_save.old_vars);
|
|
#endif
|
|
free(argv_expanded);
|
|
argv_expanded = NULL;
|
|
if (command->pid < 0) { /* [v]fork failed */
|
|
/* Clearly indicate, was it fork or vfork */
|
|
bb_perror_msg(BB_MMU ? "vfork"+1 : "vfork");
|
|
} else {
|
|
pi->alive_cmds++;
|
|
#if ENABLE_HUSH_JOB
|
|
/* Second and next children need to know pid of first one */
|
|
if (pi->pgrp < 0)
|
|
pi->pgrp = command->pid;
|
|
#endif
|
|
}
|
|
|
|
if (cmd_no > 1)
|
|
close(next_infd);
|
|
if (cmd_no < pi->num_cmds)
|
|
close(pipefds.wr);
|
|
/* Pass read (output) pipe end to next iteration */
|
|
next_infd = pipefds.rd;
|
|
}
|
|
|
|
if (!pi->alive_cmds) {
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
|
|
return 1;
|
|
}
|
|
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
|
|
return -1;
|
|
}
|
|
|
|
/* NB: called by pseudo_exec, and therefore must not modify any
|
|
* global data until exec/_exit (we can be a child after vfork!) */
|
|
static int run_list(struct pipe *pi)
|
|
{
|
|
#if ENABLE_HUSH_CASE
|
|
char *case_word = NULL;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
struct pipe *loop_top = NULL;
|
|
char **for_lcur = NULL;
|
|
char **for_list = NULL;
|
|
#endif
|
|
smallint last_followup;
|
|
smalluint rcode;
|
|
#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
|
|
smalluint cond_code = 0;
|
|
#else
|
|
enum { cond_code = 0 };
|
|
#endif
|
|
#if HAS_KEYWORDS
|
|
smallint rword; /* RES_foo */
|
|
smallint last_rword; /* ditto */
|
|
#endif
|
|
|
|
debug_printf_exec("run_list start lvl %d\n", G.run_list_level);
|
|
debug_enter();
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Check syntax for "for" */
|
|
{
|
|
struct pipe *cpipe;
|
|
for (cpipe = pi; cpipe; cpipe = cpipe->next) {
|
|
if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
|
|
continue;
|
|
/* current word is FOR or IN (BOLD in comments below) */
|
|
if (cpipe->next == NULL) {
|
|
syntax_error("malformed for");
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
|
return 1;
|
|
}
|
|
/* "FOR v; do ..." and "for v IN a b; do..." are ok */
|
|
if (cpipe->next->res_word == RES_DO)
|
|
continue;
|
|
/* next word is not "do". It must be "in" then ("FOR v in ...") */
|
|
if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
|
|
|| cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
|
|
) {
|
|
syntax_error("malformed for");
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Past this point, all code paths should jump to ret: label
|
|
* in order to return, no direct "return" statements please.
|
|
* This helps to ensure that no memory is leaked. */
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
G.run_list_level++;
|
|
#endif
|
|
|
|
#if HAS_KEYWORDS
|
|
rword = RES_NONE;
|
|
last_rword = RES_XXXX;
|
|
#endif
|
|
last_followup = PIPE_SEQ;
|
|
rcode = G.last_exitcode;
|
|
|
|
/* Go through list of pipes, (maybe) executing them. */
|
|
for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
|
|
if (G.flag_SIGINT)
|
|
break;
|
|
|
|
IF_HAS_KEYWORDS(rword = pi->res_word;)
|
|
debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
|
|
rword, cond_code, last_rword);
|
|
#if ENABLE_HUSH_LOOPS
|
|
if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
|
|
&& loop_top == NULL /* avoid bumping G.depth_of_loop twice */
|
|
) {
|
|
/* start of a loop: remember where loop starts */
|
|
loop_top = pi;
|
|
G.depth_of_loop++;
|
|
}
|
|
#endif
|
|
/* Still in the same "if...", "then..." or "do..." branch? */
|
|
if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) {
|
|
if ((rcode == 0 && last_followup == PIPE_OR)
|
|
|| (rcode != 0 && last_followup == PIPE_AND)
|
|
) {
|
|
/* It is "<true> || CMD" or "<false> && CMD"
|
|
* and we should not execute CMD */
|
|
debug_printf_exec("skipped cmd because of || or &&\n");
|
|
last_followup = pi->followup;
|
|
continue;
|
|
}
|
|
}
|
|
last_followup = pi->followup;
|
|
IF_HAS_KEYWORDS(last_rword = rword;)
|
|
#if ENABLE_HUSH_IF
|
|
if (cond_code) {
|
|
if (rword == RES_THEN) {
|
|
/* if false; then ... fi has exitcode 0! */
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
/* "if <false> THEN cmd": skip cmd */
|
|
continue;
|
|
}
|
|
} else {
|
|
if (rword == RES_ELSE || rword == RES_ELIF) {
|
|
/* "if <true> then ... ELSE/ELIF cmd":
|
|
* skip cmd and all following ones */
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
|
|
if (!for_lcur) {
|
|
/* first loop through for */
|
|
|
|
static const char encoded_dollar_at[] ALIGN1 = {
|
|
SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
|
|
}; /* encoded representation of "$@" */
|
|
static const char *const encoded_dollar_at_argv[] = {
|
|
encoded_dollar_at, NULL
|
|
}; /* argv list with one element: "$@" */
|
|
char **vals;
|
|
|
|
vals = (char**)encoded_dollar_at_argv;
|
|
if (pi->next->res_word == RES_IN) {
|
|
/* if no variable values after "in" we skip "for" */
|
|
if (!pi->next->cmds[0].argv) {
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
|
|
break;
|
|
}
|
|
vals = pi->next->cmds[0].argv;
|
|
} /* else: "for var; do..." -> assume "$@" list */
|
|
/* create list of variable values */
|
|
debug_print_strings("for_list made from", vals);
|
|
for_list = expand_strvec_to_strvec(vals);
|
|
for_lcur = for_list;
|
|
debug_print_strings("for_list", for_list);
|
|
}
|
|
if (!*for_lcur) {
|
|
/* "for" loop is over, clean up */
|
|
free(for_list);
|
|
for_list = NULL;
|
|
for_lcur = NULL;
|
|
break;
|
|
}
|
|
/* Insert next value from for_lcur */
|
|
/* note: *for_lcur already has quotes removed, $var expanded, etc */
|
|
set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
|
continue;
|
|
}
|
|
if (rword == RES_IN) {
|
|
continue; /* "for v IN list;..." - "in" has no cmds anyway */
|
|
}
|
|
if (rword == RES_DONE) {
|
|
continue; /* "done" has no cmds too */
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
if (rword == RES_CASE) {
|
|
case_word = expand_strvec_to_string(pi->cmds->argv);
|
|
continue;
|
|
}
|
|
if (rword == RES_MATCH) {
|
|
char **argv;
|
|
|
|
if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
|
|
break;
|
|
/* all prev words didn't match, does this one match? */
|
|
argv = pi->cmds->argv;
|
|
while (*argv) {
|
|
char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 1);
|
|
/* TODO: which FNM_xxx flags to use? */
|
|
cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
|
|
free(pattern);
|
|
if (cond_code == 0) { /* match! we will execute this branch */
|
|
free(case_word); /* make future "word)" stop */
|
|
case_word = NULL;
|
|
break;
|
|
}
|
|
argv++;
|
|
}
|
|
continue;
|
|
}
|
|
if (rword == RES_CASE_BODY) { /* inside of a case branch */
|
|
if (cond_code != 0)
|
|
continue; /* not matched yet, skip this pipe */
|
|
}
|
|
#endif
|
|
/* Just pressing <enter> in shell should check for jobs.
|
|
* OTOH, in non-interactive shell this is useless
|
|
* and only leads to extra job checks */
|
|
if (pi->num_cmds == 0) {
|
|
if (G_interactive_fd)
|
|
goto check_jobs_and_continue;
|
|
continue;
|
|
}
|
|
|
|
/* After analyzing all keywords and conditions, we decided
|
|
* to execute this pipe. NB: have to do checkjobs(NULL)
|
|
* after run_pipe to collect any background children,
|
|
* even if list execution is to be stopped. */
|
|
debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
|
|
{
|
|
int r;
|
|
#if ENABLE_HUSH_LOOPS
|
|
G.flag_break_continue = 0;
|
|
#endif
|
|
rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
|
|
if (r != -1) {
|
|
/* We ran a builtin, function, or group.
|
|
* rcode is already known
|
|
* and we don't need to wait for anything. */
|
|
G.last_exitcode = rcode;
|
|
debug_printf_exec(": builtin/func exitcode %d\n", rcode);
|
|
check_and_run_traps();
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Was it "break" or "continue"? */
|
|
if (G.flag_break_continue) {
|
|
smallint fbc = G.flag_break_continue;
|
|
/* We might fall into outer *loop*,
|
|
* don't want to break it too */
|
|
if (loop_top) {
|
|
G.depth_break_continue--;
|
|
if (G.depth_break_continue == 0)
|
|
G.flag_break_continue = 0;
|
|
/* else: e.g. "continue 2" should *break* once, *then* continue */
|
|
} /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
|
|
if (G.depth_break_continue != 0 || fbc == BC_BREAK)
|
|
goto check_jobs_and_break;
|
|
/* "continue": simulate end of loop */
|
|
rword = RES_DONE;
|
|
continue;
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (G.flag_return_in_progress == 1) {
|
|
/* same as "goto check_jobs_and_break" */
|
|
checkjobs(NULL);
|
|
break;
|
|
}
|
|
#endif
|
|
} else if (pi->followup == PIPE_BG) {
|
|
/* What does bash do with attempts to background builtins? */
|
|
/* even bash 3.2 doesn't do that well with nested bg:
|
|
* try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
|
|
* I'm NOT treating inner &'s as jobs */
|
|
check_and_run_traps();
|
|
#if ENABLE_HUSH_JOB
|
|
if (G.run_list_level == 1)
|
|
insert_bg_job(pi);
|
|
#endif
|
|
/* Last command's pid goes to $! */
|
|
G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
|
|
} else {
|
|
#if ENABLE_HUSH_JOB
|
|
if (G.run_list_level == 1 && G_interactive_fd) {
|
|
/* Waits for completion, then fg's main shell */
|
|
rcode = checkjobs_and_fg_shell(pi);
|
|
debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
|
|
check_and_run_traps();
|
|
} else
|
|
#endif
|
|
{ /* This one just waits for completion */
|
|
rcode = checkjobs(pi);
|
|
debug_printf_exec(": checkjobs exitcode %d\n", rcode);
|
|
check_and_run_traps();
|
|
}
|
|
G.last_exitcode = rcode;
|
|
}
|
|
}
|
|
|
|
/* Analyze how result affects subsequent commands */
|
|
#if ENABLE_HUSH_IF
|
|
if (rword == RES_IF || rword == RES_ELIF)
|
|
cond_code = rcode;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Beware of "while false; true; do ..."! */
|
|
if (pi->next
|
|
&& (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE)
|
|
/* check for RES_DONE is needed for "while ...; do \n done" case */
|
|
) {
|
|
if (rword == RES_WHILE) {
|
|
if (rcode) {
|
|
/* "while false; do...done" - exitcode 0 */
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
|
|
goto check_jobs_and_break;
|
|
}
|
|
}
|
|
if (rword == RES_UNTIL) {
|
|
if (!rcode) {
|
|
debug_printf_exec(": until expr is true: breaking\n");
|
|
check_jobs_and_break:
|
|
checkjobs(NULL);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
check_jobs_and_continue:
|
|
checkjobs(NULL);
|
|
} /* for (pi) */
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
G.run_list_level--;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (loop_top)
|
|
G.depth_of_loop--;
|
|
free(for_list);
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
free(case_word);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
|
|
return rcode;
|
|
}
|
|
|
|
/* Select which version we will use */
|
|
static int run_and_free_list(struct pipe *pi)
|
|
{
|
|
int rcode = 0;
|
|
debug_printf_exec("run_and_free_list entered\n");
|
|
if (!G.o_opt[OPT_O_NOEXEC]) {
|
|
debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
|
|
rcode = run_list(pi);
|
|
}
|
|
/* free_pipe_list has the side effect of clearing memory.
|
|
* In the long run that function can be merged with run_list,
|
|
* but doing that now would hobble the debugging effort. */
|
|
free_pipe_list(pi);
|
|
debug_printf_exec("run_and_free_list return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
|
|
static void install_sighandlers(unsigned mask)
|
|
{
|
|
sighandler_t old_handler;
|
|
unsigned sig = 0;
|
|
while ((mask >>= 1) != 0) {
|
|
sig++;
|
|
if (!(mask & 1))
|
|
continue;
|
|
old_handler = install_sighandler(sig, pick_sighandler(sig));
|
|
/* POSIX allows shell to re-enable SIGCHLD
|
|
* even if it was SIG_IGN on entry.
|
|
* Therefore we skip IGN check for it:
|
|
*/
|
|
if (sig == SIGCHLD)
|
|
continue;
|
|
if (old_handler == SIG_IGN) {
|
|
/* oops... restore back to IGN, and record this fact */
|
|
install_sighandler(sig, old_handler);
|
|
if (!G.traps)
|
|
G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = xzalloc(1); /* == xstrdup(""); */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Called a few times only (or even once if "sh -c") */
|
|
static void install_special_sighandlers(void)
|
|
{
|
|
unsigned mask;
|
|
|
|
/* Which signals are shell-special? */
|
|
mask = (1 << SIGQUIT) | (1 << SIGCHLD);
|
|
if (G_interactive_fd) {
|
|
mask |= SPECIAL_INTERACTIVE_SIGS;
|
|
if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
|
|
mask |= SPECIAL_JOBSTOP_SIGS;
|
|
}
|
|
/* Careful, do not re-install handlers we already installed */
|
|
if (G.special_sig_mask != mask) {
|
|
unsigned diff = mask & ~G.special_sig_mask;
|
|
G.special_sig_mask = mask;
|
|
install_sighandlers(diff);
|
|
}
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* helper */
|
|
/* Set handlers to restore tty pgrp and exit */
|
|
static void install_fatal_sighandlers(void)
|
|
{
|
|
unsigned mask;
|
|
|
|
/* We will restore tty pgrp on these signals */
|
|
mask = 0
|
|
+ (1 << SIGILL ) * HUSH_DEBUG
|
|
+ (1 << SIGFPE ) * HUSH_DEBUG
|
|
+ (1 << SIGBUS ) * HUSH_DEBUG
|
|
+ (1 << SIGSEGV) * HUSH_DEBUG
|
|
+ (1 << SIGTRAP) * HUSH_DEBUG
|
|
+ (1 << SIGABRT)
|
|
/* bash 3.2 seems to handle these just like 'fatal' ones */
|
|
+ (1 << SIGPIPE)
|
|
+ (1 << SIGALRM)
|
|
/* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs.
|
|
* if we aren't interactive... but in this case
|
|
* we never want to restore pgrp on exit, and this fn is not called
|
|
*/
|
|
/*+ (1 << SIGHUP )*/
|
|
/*+ (1 << SIGTERM)*/
|
|
/*+ (1 << SIGINT )*/
|
|
;
|
|
G_fatal_sig_mask = mask;
|
|
|
|
install_sighandlers(mask);
|
|
}
|
|
#endif
|
|
|
|
static int set_mode(int state, char mode, const char *o_opt)
|
|
{
|
|
int idx;
|
|
switch (mode) {
|
|
case 'n':
|
|
G.o_opt[OPT_O_NOEXEC] = state;
|
|
break;
|
|
case 'x':
|
|
IF_HUSH_MODE_X(G_x_mode = state;)
|
|
break;
|
|
case 'o':
|
|
if (!o_opt) {
|
|
/* "set -+o" without parameter.
|
|
* in bash, set -o produces this output:
|
|
* pipefail off
|
|
* and set +o:
|
|
* set +o pipefail
|
|
* We always use the second form.
|
|
*/
|
|
const char *p = o_opt_strings;
|
|
idx = 0;
|
|
while (*p) {
|
|
printf("set %co %s\n", (G.o_opt[idx] ? '-' : '+'), p);
|
|
idx++;
|
|
p += strlen(p) + 1;
|
|
}
|
|
break;
|
|
}
|
|
idx = index_in_strings(o_opt_strings, o_opt);
|
|
if (idx >= 0) {
|
|
G.o_opt[idx] = state;
|
|
break;
|
|
}
|
|
default:
|
|
return EXIT_FAILURE;
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int hush_main(int argc, char **argv)
|
|
{
|
|
enum {
|
|
OPT_login = (1 << 0),
|
|
};
|
|
unsigned flags;
|
|
int opt;
|
|
unsigned builtin_argc;
|
|
char **e;
|
|
struct variable *cur_var;
|
|
struct variable *shell_ver;
|
|
|
|
INIT_G();
|
|
if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
|
|
G.last_exitcode = EXIT_SUCCESS;
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
|
|
#endif
|
|
#if !BB_MMU
|
|
G.argv0_for_re_execing = argv[0];
|
|
#endif
|
|
/* Deal with HUSH_VERSION */
|
|
shell_ver = xzalloc(sizeof(*shell_ver));
|
|
shell_ver->flg_export = 1;
|
|
shell_ver->flg_read_only = 1;
|
|
/* Code which handles ${var<op>...} needs writable values for all variables,
|
|
* therefore we xstrdup: */
|
|
shell_ver->varstr = xstrdup(hush_version_str);
|
|
/* Create shell local variables from the values
|
|
* currently living in the environment */
|
|
debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
|
|
unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
|
|
G.top_var = shell_ver;
|
|
cur_var = G.top_var;
|
|
e = environ;
|
|
if (e) while (*e) {
|
|
char *value = strchr(*e, '=');
|
|
if (value) { /* paranoia */
|
|
cur_var->next = xzalloc(sizeof(*cur_var));
|
|
cur_var = cur_var->next;
|
|
cur_var->varstr = *e;
|
|
cur_var->max_len = strlen(*e);
|
|
cur_var->flg_export = 1;
|
|
}
|
|
e++;
|
|
}
|
|
/* (Re)insert HUSH_VERSION into env (AFTER we scanned the env!) */
|
|
debug_printf_env("putenv '%s'\n", shell_ver->varstr);
|
|
putenv(shell_ver->varstr);
|
|
|
|
/* Export PWD */
|
|
set_pwd_var(/*exp:*/ 1);
|
|
/* bash also exports SHLVL and _,
|
|
* and sets (but doesn't export) the following variables:
|
|
* BASH=/bin/bash
|
|
* BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
|
|
* BASH_VERSION='3.2.0(1)-release'
|
|
* HOSTTYPE=i386
|
|
* MACHTYPE=i386-pc-linux-gnu
|
|
* OSTYPE=linux-gnu
|
|
* HOSTNAME=<xxxxxxxxxx>
|
|
* PPID=<NNNNN> - we also do it elsewhere
|
|
* EUID=<NNNNN>
|
|
* UID=<NNNNN>
|
|
* GROUPS=()
|
|
* LINES=<NNN>
|
|
* COLUMNS=<NNN>
|
|
* BASH_ARGC=()
|
|
* BASH_ARGV=()
|
|
* BASH_LINENO=()
|
|
* BASH_SOURCE=()
|
|
* DIRSTACK=()
|
|
* PIPESTATUS=([0]="0")
|
|
* HISTFILE=/<xxx>/.bash_history
|
|
* HISTFILESIZE=500
|
|
* HISTSIZE=500
|
|
* MAILCHECK=60
|
|
* PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
|
|
* SHELL=/bin/bash
|
|
* SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
|
|
* TERM=dumb
|
|
* OPTERR=1
|
|
* OPTIND=1
|
|
* IFS=$' \t\n'
|
|
* PS1='\s-\v\$ '
|
|
* PS2='> '
|
|
* PS4='+ '
|
|
*/
|
|
|
|
#if ENABLE_FEATURE_EDITING
|
|
G.line_input_state = new_line_input_t(FOR_SHELL);
|
|
# if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_HUSH_SAVEHISTORY
|
|
{
|
|
const char *hp = get_local_var_value("HISTFILE");
|
|
if (!hp) {
|
|
hp = get_local_var_value("HOME");
|
|
if (hp) {
|
|
G.line_input_state->hist_file = concat_path_file(hp, ".hush_history");
|
|
//set_local_var(xasprintf("HISTFILE=%s", ...));
|
|
}
|
|
}
|
|
# if ENABLE_FEATURE_SH_HISTFILESIZE
|
|
hp = get_local_var_value("HISTFILESIZE");
|
|
G.line_input_state->max_history = size_from_HISTFILESIZE(hp);
|
|
# endif
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
/* Initialize some more globals to non-zero values */
|
|
cmdedit_update_prompt();
|
|
|
|
if (setjmp(die_jmp)) {
|
|
/* xfunc has failed! die die die */
|
|
/* no EXIT traps, this is an escape hatch! */
|
|
G.exiting = 1;
|
|
hush_exit(xfunc_error_retval);
|
|
}
|
|
|
|
/* Shell is non-interactive at first. We need to call
|
|
* install_special_sighandlers() if we are going to execute "sh <script>",
|
|
* "sh -c <cmds>" or login shell's /etc/profile and friends.
|
|
* If we later decide that we are interactive, we run install_special_sighandlers()
|
|
* in order to intercept (more) signals.
|
|
*/
|
|
|
|
/* Parse options */
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
|
|
flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
|
|
builtin_argc = 0;
|
|
while (1) {
|
|
opt = getopt(argc, argv, "+c:xinsl"
|
|
#if !BB_MMU
|
|
"<:$:R:V:"
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
"F:"
|
|
# endif
|
|
#endif
|
|
);
|
|
if (opt <= 0)
|
|
break;
|
|
switch (opt) {
|
|
case 'c':
|
|
/* Possibilities:
|
|
* sh ... -c 'script'
|
|
* sh ... -c 'script' ARG0 [ARG1...]
|
|
* On NOMMU, if builtin_argc != 0,
|
|
* sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...]
|
|
* "" needs to be replaced with NULL
|
|
* and BARGV vector fed to builtin function.
|
|
* Note: the form without ARG0 never happens:
|
|
* sh ... -c 'builtin' BARGV... ""
|
|
*/
|
|
if (!G.root_pid) {
|
|
G.root_pid = getpid();
|
|
G.root_ppid = getppid();
|
|
}
|
|
G.global_argv = argv + optind;
|
|
G.global_argc = argc - optind;
|
|
if (builtin_argc) {
|
|
/* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */
|
|
const struct built_in_command *x;
|
|
|
|
install_special_sighandlers();
|
|
x = find_builtin(optarg);
|
|
if (x) { /* paranoia */
|
|
G.global_argc -= builtin_argc; /* skip [BARGV...] "" */
|
|
G.global_argv += builtin_argc;
|
|
G.global_argv[-1] = NULL; /* replace "" */
|
|
fflush_all();
|
|
G.last_exitcode = x->b_function(argv + optind - 1);
|
|
}
|
|
goto final_return;
|
|
}
|
|
if (!G.global_argv[0]) {
|
|
/* -c 'script' (no params): prevent empty $0 */
|
|
G.global_argv--; /* points to argv[i] of 'script' */
|
|
G.global_argv[0] = argv[0];
|
|
G.global_argc++;
|
|
} /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */
|
|
install_special_sighandlers();
|
|
parse_and_run_string(optarg);
|
|
goto final_return;
|
|
case 'i':
|
|
/* Well, we cannot just declare interactiveness,
|
|
* we have to have some stuff (ctty, etc) */
|
|
/* G_interactive_fd++; */
|
|
break;
|
|
case 's':
|
|
/* "-s" means "read from stdin", but this is how we always
|
|
* operate, so simply do nothing here. */
|
|
break;
|
|
case 'l':
|
|
flags |= OPT_login;
|
|
break;
|
|
#if !BB_MMU
|
|
case '<': /* "big heredoc" support */
|
|
full_write1_str(optarg);
|
|
_exit(0);
|
|
case '$': {
|
|
unsigned long long empty_trap_mask;
|
|
|
|
G.root_pid = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
G.root_ppid = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
G.last_exitcode = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
builtin_argc = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
empty_trap_mask = bb_strtoull(optarg, &optarg, 16);
|
|
if (empty_trap_mask != 0) {
|
|
int sig;
|
|
install_special_sighandlers();
|
|
G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
|
for (sig = 1; sig < NSIG; sig++) {
|
|
if (empty_trap_mask & (1LL << sig)) {
|
|
G.traps[sig] = xzalloc(1); /* == xstrdup(""); */
|
|
install_sighandler(sig, SIG_IGN);
|
|
}
|
|
}
|
|
}
|
|
# if ENABLE_HUSH_LOOPS
|
|
optarg++;
|
|
G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
|
|
# endif
|
|
break;
|
|
}
|
|
case 'R':
|
|
case 'V':
|
|
set_local_var(xstrdup(optarg), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ opt == 'R');
|
|
break;
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
case 'F': {
|
|
struct function *funcp = new_function(optarg);
|
|
/* funcp->name is already set to optarg */
|
|
/* funcp->body is set to NULL. It's a special case. */
|
|
funcp->body_as_string = argv[optind];
|
|
optind++;
|
|
break;
|
|
}
|
|
# endif
|
|
#endif
|
|
case 'n':
|
|
case 'x':
|
|
if (set_mode(1, opt, NULL) == 0) /* no error */
|
|
break;
|
|
default:
|
|
#ifndef BB_VER
|
|
fprintf(stderr, "Usage: sh [FILE]...\n"
|
|
" or: sh -c command [args]...\n\n");
|
|
exit(EXIT_FAILURE);
|
|
#else
|
|
bb_show_usage();
|
|
#endif
|
|
}
|
|
} /* option parsing loop */
|
|
|
|
/* Skip options. Try "hush -l": $1 should not be "-l"! */
|
|
G.global_argc = argc - (optind - 1);
|
|
G.global_argv = argv + (optind - 1);
|
|
G.global_argv[0] = argv[0];
|
|
|
|
if (!G.root_pid) {
|
|
G.root_pid = getpid();
|
|
G.root_ppid = getppid();
|
|
}
|
|
|
|
/* If we are login shell... */
|
|
if (flags & OPT_login) {
|
|
FILE *input;
|
|
debug_printf("sourcing /etc/profile\n");
|
|
input = fopen_for_read("/etc/profile");
|
|
if (input != NULL) {
|
|
close_on_exec_on(fileno(input));
|
|
install_special_sighandlers();
|
|
parse_and_run_file(input);
|
|
fclose(input);
|
|
}
|
|
/* bash: after sourcing /etc/profile,
|
|
* tries to source (in the given order):
|
|
* ~/.bash_profile, ~/.bash_login, ~/.profile,
|
|
* stopping on first found. --noprofile turns this off.
|
|
* bash also sources ~/.bash_logout on exit.
|
|
* If called as sh, skips .bash_XXX files.
|
|
*/
|
|
}
|
|
|
|
if (G.global_argv[1]) {
|
|
FILE *input;
|
|
/*
|
|
* "bash <script>" (which is never interactive (unless -i?))
|
|
* sources $BASH_ENV here (without scanning $PATH).
|
|
* If called as sh, does the same but with $ENV.
|
|
*/
|
|
G.global_argc--;
|
|
G.global_argv++;
|
|
debug_printf("running script '%s'\n", G.global_argv[0]);
|
|
input = xfopen_for_read(G.global_argv[0]);
|
|
close_on_exec_on(fileno(input));
|
|
install_special_sighandlers();
|
|
parse_and_run_file(input);
|
|
#if ENABLE_FEATURE_CLEAN_UP
|
|
fclose(input);
|
|
#endif
|
|
goto final_return;
|
|
}
|
|
|
|
/* Up to here, shell was non-interactive. Now it may become one.
|
|
* NB: don't forget to (re)run install_special_sighandlers() as needed.
|
|
*/
|
|
|
|
/* A shell is interactive if the '-i' flag was given,
|
|
* or if all of the following conditions are met:
|
|
* no -c command
|
|
* no arguments remaining or the -s flag given
|
|
* standard input is a terminal
|
|
* standard output is a terminal
|
|
* Refer to Posix.2, the description of the 'sh' utility.
|
|
*/
|
|
#if ENABLE_HUSH_JOB
|
|
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
|
G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
|
|
debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp);
|
|
if (G_saved_tty_pgrp < 0)
|
|
G_saved_tty_pgrp = 0;
|
|
|
|
/* try to dup stdin to high fd#, >= 255 */
|
|
G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
|
if (G_interactive_fd < 0) {
|
|
/* try to dup to any fd */
|
|
G_interactive_fd = dup(STDIN_FILENO);
|
|
if (G_interactive_fd < 0) {
|
|
/* give up */
|
|
G_interactive_fd = 0;
|
|
G_saved_tty_pgrp = 0;
|
|
}
|
|
}
|
|
// TODO: track & disallow any attempts of user
|
|
// to (inadvertently) close/redirect G_interactive_fd
|
|
}
|
|
debug_printf("interactive_fd:%d\n", G_interactive_fd);
|
|
if (G_interactive_fd) {
|
|
close_on_exec_on(G_interactive_fd);
|
|
|
|
if (G_saved_tty_pgrp) {
|
|
/* If we were run as 'hush &', sleep until we are
|
|
* in the foreground (tty pgrp == our pgrp).
|
|
* If we get started under a job aware app (like bash),
|
|
* make sure we are now in charge so we don't fight over
|
|
* who gets the foreground */
|
|
while (1) {
|
|
pid_t shell_pgrp = getpgrp();
|
|
G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
|
|
if (G_saved_tty_pgrp == shell_pgrp)
|
|
break;
|
|
/* send TTIN to ourself (should stop us) */
|
|
kill(- shell_pgrp, SIGTTIN);
|
|
}
|
|
}
|
|
|
|
/* Install more signal handlers */
|
|
install_special_sighandlers();
|
|
|
|
if (G_saved_tty_pgrp) {
|
|
/* Set other signals to restore saved_tty_pgrp */
|
|
install_fatal_sighandlers();
|
|
/* Put ourselves in our own process group
|
|
* (bash, too, does this only if ctty is available) */
|
|
bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
|
|
/* Grab control of the terminal */
|
|
tcsetpgrp(G_interactive_fd, getpid());
|
|
}
|
|
/* -1 is special - makes xfuncs longjmp, not exit
|
|
* (we reset die_sleep = 0 whereever we [v]fork) */
|
|
enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */
|
|
} else {
|
|
install_special_sighandlers();
|
|
}
|
|
#elif ENABLE_HUSH_INTERACTIVE
|
|
/* No job control compiled in, only prompt/line editing */
|
|
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
|
G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
|
if (G_interactive_fd < 0) {
|
|
/* try to dup to any fd */
|
|
G_interactive_fd = dup(STDIN_FILENO);
|
|
if (G_interactive_fd < 0)
|
|
/* give up */
|
|
G_interactive_fd = 0;
|
|
}
|
|
}
|
|
if (G_interactive_fd) {
|
|
close_on_exec_on(G_interactive_fd);
|
|
}
|
|
install_special_sighandlers();
|
|
#else
|
|
/* We have interactiveness code disabled */
|
|
install_special_sighandlers();
|
|
#endif
|
|
/* bash:
|
|
* if interactive but not a login shell, sources ~/.bashrc
|
|
* (--norc turns this off, --rcfile <file> overrides)
|
|
*/
|
|
|
|
if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
|
|
/* note: ash and hush share this string */
|
|
printf("\n\n%s %s\n"
|
|
IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n")
|
|
"\n",
|
|
bb_banner,
|
|
"hush - the humble shell"
|
|
);
|
|
}
|
|
|
|
parse_and_run_file(stdin);
|
|
|
|
final_return:
|
|
hush_exit(G.last_exitcode);
|
|
}
|
|
|
|
|
|
#if ENABLE_MSH
|
|
int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int msh_main(int argc, char **argv)
|
|
{
|
|
//bb_error_msg("msh is deprecated, please use hush instead");
|
|
return hush_main(argc, argv);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Built-ins
|
|
*/
|
|
static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv))
|
|
{
|
|
int argc = 0;
|
|
while (*argv) {
|
|
argc++;
|
|
argv++;
|
|
}
|
|
return applet_main_func(argc, argv - argc);
|
|
}
|
|
|
|
static int FAST_FUNC builtin_test(char **argv)
|
|
{
|
|
return run_applet_main(argv, test_main);
|
|
}
|
|
|
|
static int FAST_FUNC builtin_echo(char **argv)
|
|
{
|
|
return run_applet_main(argv, echo_main);
|
|
}
|
|
|
|
#if ENABLE_PRINTF
|
|
static int FAST_FUNC builtin_printf(char **argv)
|
|
{
|
|
return run_applet_main(argv, printf_main);
|
|
}
|
|
#endif
|
|
|
|
static char **skip_dash_dash(char **argv)
|
|
{
|
|
argv++;
|
|
if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0')
|
|
argv++;
|
|
return argv;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_eval(char **argv)
|
|
{
|
|
int rcode = EXIT_SUCCESS;
|
|
|
|
argv = skip_dash_dash(argv);
|
|
if (*argv) {
|
|
char *str = expand_strvec_to_string(argv);
|
|
/* bash:
|
|
* eval "echo Hi; done" ("done" is syntax error):
|
|
* "echo Hi" will not execute too.
|
|
*/
|
|
parse_and_run_string(str);
|
|
free(str);
|
|
rcode = G.last_exitcode;
|
|
}
|
|
return rcode;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_cd(char **argv)
|
|
{
|
|
const char *newdir;
|
|
|
|
argv = skip_dash_dash(argv);
|
|
newdir = argv[0];
|
|
if (newdir == NULL) {
|
|
/* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
|
* bash says "bash: cd: HOME not set" and does nothing
|
|
* (exitcode 1)
|
|
*/
|
|
const char *home = get_local_var_value("HOME");
|
|
newdir = home ? home : "/";
|
|
}
|
|
if (chdir(newdir)) {
|
|
/* Mimic bash message exactly */
|
|
bb_perror_msg("cd: %s", newdir);
|
|
return EXIT_FAILURE;
|
|
}
|
|
/* Read current dir (get_cwd(1) is inside) and set PWD.
|
|
* Note: do not enforce exporting. If PWD was unset or unexported,
|
|
* set it again, but do not export. bash does the same.
|
|
*/
|
|
set_pwd_var(/*exp:*/ 0);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_exec(char **argv)
|
|
{
|
|
argv = skip_dash_dash(argv);
|
|
if (argv[0] == NULL)
|
|
return EXIT_SUCCESS; /* bash does this */
|
|
|
|
/* Careful: we can end up here after [v]fork. Do not restore
|
|
* tty pgrp then, only top-level shell process does that */
|
|
if (G_saved_tty_pgrp && getpid() == G.root_pid)
|
|
tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
|
|
|
/* TODO: if exec fails, bash does NOT exit! We do.
|
|
* We'll need to undo trap cleanup (it's inside execvp_or_die)
|
|
* and tcsetpgrp, and this is inherently racy.
|
|
*/
|
|
execvp_or_die(argv);
|
|
}
|
|
|
|
static int FAST_FUNC builtin_exit(char **argv)
|
|
{
|
|
debug_printf_exec("%s()\n", __func__);
|
|
|
|
/* interactive bash:
|
|
* # trap "echo EEE" EXIT
|
|
* # exit
|
|
* exit
|
|
* There are stopped jobs.
|
|
* (if there are _stopped_ jobs, running ones don't count)
|
|
* # exit
|
|
* exit
|
|
# EEE (then bash exits)
|
|
*
|
|
* TODO: we can use G.exiting = -1 as indicator "last cmd was exit"
|
|
*/
|
|
|
|
/* note: EXIT trap is run by hush_exit */
|
|
argv = skip_dash_dash(argv);
|
|
if (argv[0] == NULL)
|
|
hush_exit(G.last_exitcode);
|
|
/* mimic bash: exit 123abc == exit 255 + error msg */
|
|
xfunc_error_retval = 255;
|
|
/* bash: exit -2 == exit 254, no error msg */
|
|
hush_exit(xatoi(argv[0]) & 0xff);
|
|
}
|
|
|
|
static void print_escaped(const char *s)
|
|
{
|
|
if (*s == '\'')
|
|
goto squote;
|
|
do {
|
|
const char *p = strchrnul(s, '\'');
|
|
/* print 'xxxx', possibly just '' */
|
|
printf("'%.*s'", (int)(p - s), s);
|
|
if (*p == '\0')
|
|
break;
|
|
s = p;
|
|
squote:
|
|
/* s points to '; print "'''...'''" */
|
|
putchar('"');
|
|
do putchar('\''); while (*++s == '\'');
|
|
putchar('"');
|
|
} while (*s);
|
|
}
|
|
|
|
#if !ENABLE_HUSH_LOCAL
|
|
#define helper_export_local(argv, exp, lvl) \
|
|
helper_export_local(argv, exp)
|
|
#endif
|
|
static void helper_export_local(char **argv, int exp, int lvl)
|
|
{
|
|
do {
|
|
char *name = *argv;
|
|
char *name_end = strchrnul(name, '=');
|
|
|
|
/* So far we do not check that name is valid (TODO?) */
|
|
|
|
if (*name_end == '\0') {
|
|
struct variable *var, **vpp;
|
|
|
|
vpp = get_ptr_to_local_var(name, name_end - name);
|
|
var = vpp ? *vpp : NULL;
|
|
|
|
if (exp == -1) { /* unexporting? */
|
|
/* export -n NAME (without =VALUE) */
|
|
if (var) {
|
|
var->flg_export = 0;
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, name);
|
|
unsetenv(name);
|
|
} /* else: export -n NOT_EXISTING_VAR: no-op */
|
|
continue;
|
|
}
|
|
if (exp == 1) { /* exporting? */
|
|
/* export NAME (without =VALUE) */
|
|
if (var) {
|
|
var->flg_export = 1;
|
|
debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
|
|
putenv(var->varstr);
|
|
continue;
|
|
}
|
|
}
|
|
/* Exporting non-existing variable.
|
|
* bash does not put it in environment,
|
|
* but remembers that it is exported,
|
|
* and does put it in env when it is set later.
|
|
* We just set it to "" and export. */
|
|
/* Or, it's "local NAME" (without =VALUE).
|
|
* bash sets the value to "". */
|
|
name = xasprintf("%s=", name);
|
|
} else {
|
|
/* (Un)exporting/making local NAME=VALUE */
|
|
name = xstrdup(name);
|
|
}
|
|
set_local_var(name, /*exp:*/ exp, /*lvl:*/ lvl, /*ro:*/ 0);
|
|
} while (*++argv);
|
|
}
|
|
|
|
static int FAST_FUNC builtin_export(char **argv)
|
|
{
|
|
unsigned opt_unexport;
|
|
|
|
#if ENABLE_HUSH_EXPORT_N
|
|
/* "!": do not abort on errors */
|
|
opt_unexport = getopt32(argv, "!n");
|
|
if (opt_unexport == (uint32_t)-1)
|
|
return EXIT_FAILURE;
|
|
argv += optind;
|
|
#else
|
|
opt_unexport = 0;
|
|
argv++;
|
|
#endif
|
|
|
|
if (argv[0] == NULL) {
|
|
char **e = environ;
|
|
if (e) {
|
|
while (*e) {
|
|
#if 0
|
|
puts(*e++);
|
|
#else
|
|
/* ash emits: export VAR='VAL'
|
|
* bash: declare -x VAR="VAL"
|
|
* we follow ash example */
|
|
const char *s = *e++;
|
|
const char *p = strchr(s, '=');
|
|
|
|
if (!p) /* wtf? take next variable */
|
|
continue;
|
|
/* export var= */
|
|
printf("export %.*s", (int)(p - s) + 1, s);
|
|
print_escaped(p + 1);
|
|
putchar('\n');
|
|
#endif
|
|
}
|
|
/*fflush_all(); - done after each builtin anyway */
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
helper_export_local(argv, (opt_unexport ? -1 : 1), 0);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#if ENABLE_HUSH_LOCAL
|
|
static int FAST_FUNC builtin_local(char **argv)
|
|
{
|
|
if (G.func_nest_level == 0) {
|
|
bb_error_msg("%s: not in a function", argv[0]);
|
|
return EXIT_FAILURE; /* bash compat */
|
|
}
|
|
helper_export_local(argv, 0, G.func_nest_level);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
static int FAST_FUNC builtin_trap(char **argv)
|
|
{
|
|
int sig;
|
|
char *new_cmd;
|
|
|
|
if (!G.traps)
|
|
G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
|
|
|
argv++;
|
|
if (!*argv) {
|
|
int i;
|
|
/* No args: print all trapped */
|
|
for (i = 0; i < NSIG; ++i) {
|
|
if (G.traps[i]) {
|
|
printf("trap -- ");
|
|
print_escaped(G.traps[i]);
|
|
/* note: bash adds "SIG", but only if invoked
|
|
* as "bash". If called as "sh", or if set -o posix,
|
|
* then it prints short signal names.
|
|
* We are printing short names: */
|
|
printf(" %s\n", get_signame(i));
|
|
}
|
|
}
|
|
/*fflush_all(); - done after each builtin anyway */
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
new_cmd = NULL;
|
|
/* If first arg is a number: reset all specified signals */
|
|
sig = bb_strtou(*argv, NULL, 10);
|
|
if (errno == 0) {
|
|
int ret;
|
|
process_sig_list:
|
|
ret = EXIT_SUCCESS;
|
|
while (*argv) {
|
|
sighandler_t handler;
|
|
|
|
sig = get_signum(*argv++);
|
|
if (sig < 0 || sig >= NSIG) {
|
|
ret = EXIT_FAILURE;
|
|
/* Mimic bash message exactly */
|
|
bb_perror_msg("trap: %s: invalid signal specification", argv[-1]);
|
|
continue;
|
|
}
|
|
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = xstrdup(new_cmd);
|
|
|
|
debug_printf("trap: setting SIG%s (%i) to '%s'\n",
|
|
get_signame(sig), sig, G.traps[sig]);
|
|
|
|
/* There is no signal for 0 (EXIT) */
|
|
if (sig == 0)
|
|
continue;
|
|
|
|
if (new_cmd)
|
|
handler = (new_cmd[0] ? record_pending_signo : SIG_IGN);
|
|
else
|
|
/* We are removing trap handler */
|
|
handler = pick_sighandler(sig);
|
|
install_sighandler(sig, handler);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
if (!argv[1]) { /* no second arg */
|
|
bb_error_msg("trap: invalid arguments");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* First arg is "-": reset all specified to default */
|
|
/* First arg is "--": skip it, the rest is "handler SIGs..." */
|
|
/* Everything else: set arg as signal handler
|
|
* (includes "" case, which ignores signal) */
|
|
if (argv[0][0] == '-') {
|
|
if (argv[0][1] == '\0') { /* "-" */
|
|
/* new_cmd remains NULL: "reset these sigs" */
|
|
goto reset_traps;
|
|
}
|
|
if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */
|
|
argv++;
|
|
}
|
|
/* else: "-something", no special meaning */
|
|
}
|
|
new_cmd = *argv;
|
|
reset_traps:
|
|
argv++;
|
|
goto process_sig_list;
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
|
|
static int FAST_FUNC builtin_type(char **argv)
|
|
{
|
|
int ret = EXIT_SUCCESS;
|
|
|
|
while (*++argv) {
|
|
const char *type;
|
|
char *path = NULL;
|
|
|
|
if (0) {} /* make conditional compile easier below */
|
|
/*else if (find_alias(*argv))
|
|
type = "an alias";*/
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else if (find_function(*argv))
|
|
type = "a function";
|
|
#endif
|
|
else if (find_builtin(*argv))
|
|
type = "a shell builtin";
|
|
else if ((path = find_in_path(*argv)) != NULL)
|
|
type = path;
|
|
else {
|
|
bb_error_msg("type: %s: not found", *argv);
|
|
ret = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
|
|
printf("%s is %s\n", *argv, type);
|
|
free(path);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* built-in 'fg' and 'bg' handler */
|
|
static int FAST_FUNC builtin_fg_bg(char **argv)
|
|
{
|
|
int i, jobnum;
|
|
struct pipe *pi;
|
|
|
|
if (!G_interactive_fd)
|
|
return EXIT_FAILURE;
|
|
|
|
/* If they gave us no args, assume they want the last backgrounded task */
|
|
if (!argv[1]) {
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
if (pi->jobid == G.last_jobid) {
|
|
goto found;
|
|
}
|
|
}
|
|
bb_error_msg("%s: no current job", argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
|
|
bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
if (pi->jobid == jobnum) {
|
|
goto found;
|
|
}
|
|
}
|
|
bb_error_msg("%s: %d: no such job", argv[0], jobnum);
|
|
return EXIT_FAILURE;
|
|
found:
|
|
/* TODO: bash prints a string representation
|
|
* of job being foregrounded (like "sleep 1 | cat") */
|
|
if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
|
|
/* Put the job into the foreground. */
|
|
tcsetpgrp(G_interactive_fd, pi->pgrp);
|
|
}
|
|
|
|
/* Restart the processes in the job */
|
|
debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
|
|
pi->cmds[i].is_stopped = 0;
|
|
}
|
|
pi->stopped_cmds = 0;
|
|
|
|
i = kill(- pi->pgrp, SIGCONT);
|
|
if (i < 0) {
|
|
if (errno == ESRCH) {
|
|
delete_finished_bg_job(pi);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
bb_perror_msg("kill (SIGCONT)");
|
|
}
|
|
|
|
if (argv[0][0] == 'f') {
|
|
remove_bg_job(pi);
|
|
return checkjobs_and_fg_shell(pi);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_HELP
|
|
static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
|
|
{
|
|
const struct built_in_command *x;
|
|
|
|
printf(
|
|
"Built-in commands:\n"
|
|
"------------------\n");
|
|
for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) {
|
|
if (x->b_descr)
|
|
printf("%-10s%s\n", x->b_cmd, x->b_descr);
|
|
}
|
|
bb_putchar('\n');
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
|
|
{
|
|
struct pipe *job;
|
|
const char *status_string;
|
|
|
|
for (job = G.job_list; job; job = job->next) {
|
|
if (job->alive_cmds == job->stopped_cmds)
|
|
status_string = "Stopped";
|
|
else
|
|
status_string = "Running";
|
|
|
|
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if HUSH_DEBUG
|
|
static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM)
|
|
{
|
|
void *p;
|
|
unsigned long l;
|
|
|
|
# ifdef M_TRIM_THRESHOLD
|
|
/* Optional. Reduces probability of false positives */
|
|
malloc_trim(0);
|
|
# endif
|
|
/* Crude attempt to find where "free memory" starts,
|
|
* sans fragmentation. */
|
|
p = malloc(240);
|
|
l = (unsigned long)p;
|
|
free(p);
|
|
p = malloc(3400);
|
|
if (l < (unsigned long)p) l = (unsigned long)p;
|
|
free(p);
|
|
|
|
if (!G.memleak_value)
|
|
G.memleak_value = l;
|
|
|
|
l -= G.memleak_value;
|
|
if ((long)l < 0)
|
|
l = 0;
|
|
l /= 1024;
|
|
if (l > 127)
|
|
l = 127;
|
|
|
|
/* Exitcode is "how many kilobytes we leaked since 1st call" */
|
|
return l;
|
|
}
|
|
#endif
|
|
|
|
static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM)
|
|
{
|
|
puts(get_cwd(0));
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* Interruptibility of read builtin in bash
|
|
* (tested on bash-4.2.8 by sending signals (not by ^C)):
|
|
*
|
|
* Empty trap makes read ignore corresponding signal, for any signal.
|
|
*
|
|
* SIGINT:
|
|
* - terminates non-interactive shell;
|
|
* - interrupts read in interactive shell;
|
|
* if it has non-empty trap:
|
|
* - executes trap and returns to command prompt in interactive shell;
|
|
* - executes trap and returns to read in non-interactive shell;
|
|
* SIGTERM:
|
|
* - is ignored (does not interrupt) read in interactive shell;
|
|
* - terminates non-interactive shell;
|
|
* if it has non-empty trap:
|
|
* - executes trap and returns to read;
|
|
* SIGHUP:
|
|
* - terminates shell (regardless of interactivity);
|
|
* if it has non-empty trap:
|
|
* - executes trap and returns to read;
|
|
*/
|
|
static int FAST_FUNC builtin_read(char **argv)
|
|
{
|
|
const char *r;
|
|
char *opt_n = NULL;
|
|
char *opt_p = NULL;
|
|
char *opt_t = NULL;
|
|
char *opt_u = NULL;
|
|
const char *ifs;
|
|
int read_flags;
|
|
|
|
/* "!": do not abort on errors.
|
|
* Option string must start with "sr" to match BUILTIN_READ_xxx
|
|
*/
|
|
read_flags = getopt32(argv, "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u);
|
|
if (read_flags == (uint32_t)-1)
|
|
return EXIT_FAILURE;
|
|
argv += optind;
|
|
ifs = get_local_var_value("IFS"); /* can be NULL */
|
|
|
|
again:
|
|
r = shell_builtin_read(set_local_var_from_halves,
|
|
argv,
|
|
ifs,
|
|
read_flags,
|
|
opt_n,
|
|
opt_p,
|
|
opt_t,
|
|
opt_u
|
|
);
|
|
|
|
if ((uintptr_t)r == 1 && errno == EINTR) {
|
|
unsigned sig = check_and_run_traps();
|
|
if (sig && sig != SIGINT)
|
|
goto again;
|
|
}
|
|
|
|
if ((uintptr_t)r > 1) {
|
|
bb_error_msg("%s", r);
|
|
r = (char*)(uintptr_t)1;
|
|
}
|
|
|
|
return (uintptr_t)r;
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
|
|
* built-in 'set' handler
|
|
* SUSv3 says:
|
|
* set [-abCefhmnuvx] [-o option] [argument...]
|
|
* set [+abCefhmnuvx] [+o option] [argument...]
|
|
* set -- [argument...]
|
|
* set -o
|
|
* set +o
|
|
* Implementations shall support the options in both their hyphen and
|
|
* plus-sign forms. These options can also be specified as options to sh.
|
|
* Examples:
|
|
* Write out all variables and their values: set
|
|
* Set $1, $2, and $3 and set "$#" to 3: set c a b
|
|
* Turn on the -x and -v options: set -xv
|
|
* Unset all positional parameters: set --
|
|
* Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
|
|
* Set the positional parameters to the expansion of x, even if x expands
|
|
* with a leading '-' or '+': set -- $x
|
|
*
|
|
* So far, we only support "set -- [argument...]" and some of the short names.
|
|
*/
|
|
static int FAST_FUNC builtin_set(char **argv)
|
|
{
|
|
int n;
|
|
char **pp, **g_argv;
|
|
char *arg = *++argv;
|
|
|
|
if (arg == NULL) {
|
|
struct variable *e;
|
|
for (e = G.top_var; e; e = e->next)
|
|
puts(e->varstr);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
do {
|
|
if (strcmp(arg, "--") == 0) {
|
|
++argv;
|
|
goto set_argv;
|
|
}
|
|
if (arg[0] != '+' && arg[0] != '-')
|
|
break;
|
|
for (n = 1; arg[n]; ++n) {
|
|
if (set_mode((arg[0] == '-'), arg[n], argv[1]))
|
|
goto error;
|
|
if (arg[n] == 'o' && argv[1])
|
|
argv++;
|
|
}
|
|
} while ((arg = *++argv) != NULL);
|
|
/* Now argv[0] is 1st argument */
|
|
|
|
if (arg == NULL)
|
|
return EXIT_SUCCESS;
|
|
set_argv:
|
|
|
|
/* NB: G.global_argv[0] ($0) is never freed/changed */
|
|
g_argv = G.global_argv;
|
|
if (G.global_args_malloced) {
|
|
pp = g_argv;
|
|
while (*++pp)
|
|
free(*pp);
|
|
g_argv[1] = NULL;
|
|
} else {
|
|
G.global_args_malloced = 1;
|
|
pp = xzalloc(sizeof(pp[0]) * 2);
|
|
pp[0] = g_argv[0]; /* retain $0 */
|
|
g_argv = pp;
|
|
}
|
|
/* This realloc's G.global_argv */
|
|
G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
|
|
|
|
n = 1;
|
|
while (*++pp)
|
|
n++;
|
|
G.global_argc = n;
|
|
|
|
return EXIT_SUCCESS;
|
|
|
|
/* Nothing known, so abort */
|
|
error:
|
|
bb_error_msg("set: %s: invalid option", arg);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_shift(char **argv)
|
|
{
|
|
int n = 1;
|
|
argv = skip_dash_dash(argv);
|
|
if (argv[0]) {
|
|
n = atoi(argv[0]);
|
|
}
|
|
if (n >= 0 && n < G.global_argc) {
|
|
if (G.global_args_malloced) {
|
|
int m = 1;
|
|
while (m <= n)
|
|
free(G.global_argv[m++]);
|
|
}
|
|
G.global_argc -= n;
|
|
memmove(&G.global_argv[1], &G.global_argv[n+1],
|
|
G.global_argc * sizeof(G.global_argv[0]));
|
|
return EXIT_SUCCESS;
|
|
}
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_source(char **argv)
|
|
{
|
|
char *arg_path, *filename;
|
|
FILE *input;
|
|
save_arg_t sv;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
smallint sv_flg;
|
|
#endif
|
|
|
|
argv = skip_dash_dash(argv);
|
|
filename = argv[0];
|
|
if (!filename) {
|
|
/* bash says: "bash: .: filename argument required" */
|
|
return 2; /* bash compat */
|
|
}
|
|
arg_path = NULL;
|
|
if (!strchr(filename, '/')) {
|
|
arg_path = find_in_path(filename);
|
|
if (arg_path)
|
|
filename = arg_path;
|
|
}
|
|
input = fopen_or_warn(filename, "r");
|
|
free(arg_path);
|
|
if (!input) {
|
|
/* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
|
|
return EXIT_FAILURE;
|
|
}
|
|
close_on_exec_on(fileno(input));
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
sv_flg = G.flag_return_in_progress;
|
|
/* "we are inside sourced file, ok to use return" */
|
|
G.flag_return_in_progress = -1;
|
|
#endif
|
|
save_and_replace_G_args(&sv, argv);
|
|
|
|
parse_and_run_file(input);
|
|
fclose(input);
|
|
|
|
restore_G_args(&sv, argv);
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
G.flag_return_in_progress = sv_flg;
|
|
#endif
|
|
|
|
return G.last_exitcode;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_umask(char **argv)
|
|
{
|
|
int rc;
|
|
mode_t mask;
|
|
|
|
mask = umask(0);
|
|
argv = skip_dash_dash(argv);
|
|
if (argv[0]) {
|
|
mode_t old_mask = mask;
|
|
|
|
mask ^= 0777;
|
|
rc = bb_parse_mode(argv[0], &mask);
|
|
mask ^= 0777;
|
|
if (rc == 0) {
|
|
mask = old_mask;
|
|
/* bash messages:
|
|
* bash: umask: 'q': invalid symbolic mode operator
|
|
* bash: umask: 999: octal number out of range
|
|
*/
|
|
bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]);
|
|
}
|
|
} else {
|
|
rc = 1;
|
|
/* Mimic bash */
|
|
printf("%04o\n", (unsigned) mask);
|
|
/* fall through and restore mask which we set to 0 */
|
|
}
|
|
umask(mask);
|
|
|
|
return !rc; /* rc != 0 - success */
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
|
|
static int FAST_FUNC builtin_unset(char **argv)
|
|
{
|
|
int ret;
|
|
unsigned opts;
|
|
|
|
/* "!": do not abort on errors */
|
|
/* "+": stop at 1st non-option */
|
|
opts = getopt32(argv, "!+vf");
|
|
if (opts == (unsigned)-1)
|
|
return EXIT_FAILURE;
|
|
if (opts == 3) {
|
|
bb_error_msg("unset: -v and -f are exclusive");
|
|
return EXIT_FAILURE;
|
|
}
|
|
argv += optind;
|
|
|
|
ret = EXIT_SUCCESS;
|
|
while (*argv) {
|
|
if (!(opts & 2)) { /* not -f */
|
|
if (unset_local_var(*argv)) {
|
|
/* unset <nonexistent_var> doesn't fail.
|
|
* Error is when one tries to unset RO var.
|
|
* Message was printed by unset_local_var. */
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else {
|
|
unset_func(*argv);
|
|
}
|
|
#endif
|
|
argv++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
|
|
static int FAST_FUNC builtin_wait(char **argv)
|
|
{
|
|
int ret = EXIT_SUCCESS;
|
|
int status;
|
|
|
|
argv = skip_dash_dash(argv);
|
|
if (argv[0] == NULL) {
|
|
/* Don't care about wait results */
|
|
/* Note 1: must wait until there are no more children */
|
|
/* Note 2: must be interruptible */
|
|
/* Examples:
|
|
* $ sleep 3 & sleep 6 & wait
|
|
* [1] 30934 sleep 3
|
|
* [2] 30935 sleep 6
|
|
* [1] Done sleep 3
|
|
* [2] Done sleep 6
|
|
* $ sleep 3 & sleep 6 & wait
|
|
* [1] 30936 sleep 3
|
|
* [2] 30937 sleep 6
|
|
* [1] Done sleep 3
|
|
* ^C <-- after ~4 sec from keyboard
|
|
* $
|
|
*/
|
|
while (1) {
|
|
int sig;
|
|
sigset_t oldset, allsigs;
|
|
|
|
/* waitpid is not interruptible by SA_RESTARTed
|
|
* signals which we use. Thus, this ugly dance:
|
|
*/
|
|
|
|
/* Make sure possible SIGCHLD is stored in kernel's
|
|
* pending signal mask before we call waitpid.
|
|
* Or else we may race with SIGCHLD, lose it,
|
|
* and get stuck in sigwaitinfo...
|
|
*/
|
|
sigfillset(&allsigs);
|
|
sigprocmask(SIG_SETMASK, &allsigs, &oldset);
|
|
|
|
if (!sigisemptyset(&G.pending_set)) {
|
|
/* Crap! we raced with some signal! */
|
|
// sig = 0;
|
|
goto restore;
|
|
}
|
|
|
|
checkjobs(NULL); /* waitpid(WNOHANG) inside */
|
|
if (errno == ECHILD) {
|
|
sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
break;
|
|
}
|
|
|
|
/* Wait for SIGCHLD or any other signal */
|
|
//sig = sigwaitinfo(&allsigs, NULL);
|
|
/* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */
|
|
/* Note: sigsuspend invokes signal handler */
|
|
sigsuspend(&oldset);
|
|
restore:
|
|
sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
|
|
/* So, did we get a signal? */
|
|
//if (sig > 0)
|
|
// raise(sig); /* run handler */
|
|
sig = check_and_run_traps();
|
|
if (sig /*&& sig != SIGCHLD - always true */) {
|
|
/* see note 2 */
|
|
ret = 128 + sig;
|
|
break;
|
|
}
|
|
/* SIGCHLD, or no signal, or ignored one, such as SIGQUIT. Repeat */
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* This is probably buggy wrt interruptible-ness */
|
|
while (*argv) {
|
|
pid_t pid = bb_strtou(*argv, NULL, 10);
|
|
if (errno) {
|
|
/* mimic bash message */
|
|
bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (waitpid(pid, &status, 0) == pid) {
|
|
if (WIFSIGNALED(status))
|
|
ret = 128 + WTERMSIG(status);
|
|
else if (WIFEXITED(status))
|
|
ret = WEXITSTATUS(status);
|
|
else /* wtf? */
|
|
ret = EXIT_FAILURE;
|
|
} else {
|
|
bb_perror_msg("wait %s", *argv);
|
|
ret = 127;
|
|
}
|
|
argv++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS
|
|
static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min)
|
|
{
|
|
if (argv[1]) {
|
|
def = bb_strtou(argv[1], NULL, 10);
|
|
if (errno || def < def_min || argv[2]) {
|
|
bb_error_msg("%s: bad arguments", argv[0]);
|
|
def = UINT_MAX;
|
|
}
|
|
}
|
|
return def;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
static int FAST_FUNC builtin_break(char **argv)
|
|
{
|
|
unsigned depth;
|
|
if (G.depth_of_loop == 0) {
|
|
bb_error_msg("%s: only meaningful in a loop", argv[0]);
|
|
return EXIT_SUCCESS; /* bash compat */
|
|
}
|
|
G.flag_break_continue++; /* BC_BREAK = 1 */
|
|
|
|
G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1);
|
|
if (depth == UINT_MAX)
|
|
G.flag_break_continue = BC_BREAK;
|
|
if (G.depth_of_loop < depth)
|
|
G.depth_break_continue = G.depth_of_loop;
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int FAST_FUNC builtin_continue(char **argv)
|
|
{
|
|
G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
|
|
return builtin_break(argv);
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static int FAST_FUNC builtin_return(char **argv)
|
|
{
|
|
int rc;
|
|
|
|
if (G.flag_return_in_progress != -1) {
|
|
bb_error_msg("%s: not in a function or sourced script", argv[0]);
|
|
return EXIT_FAILURE; /* bash compat */
|
|
}
|
|
|
|
G.flag_return_in_progress = 1;
|
|
|
|
/* bash:
|
|
* out of range: wraps around at 256, does not error out
|
|
* non-numeric param:
|
|
* f() { false; return qwe; }; f; echo $?
|
|
* bash: return: qwe: numeric argument required <== we do this
|
|
* 255 <== we also do this
|
|
*/
|
|
rc = parse_numeric_argv1(argv, G.last_exitcode, 0);
|
|
return rc;
|
|
}
|
|
#endif
|