3113 lines
84 KiB
C
3113 lines
84 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* sh.c -- a prototype Bourne shell grammar parser
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* Intended to follow the original Thompson and Ritchie
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* "small and simple is beautiful" philosophy, which
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* incidentally is a good match to today's BusyBox.
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*
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* Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
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*
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* Credits:
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* The parser routines proper are all original material, first
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* written Dec 2000 and Jan 2001 by Larry Doolittle. The
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* execution engine, the builtins, and much of the underlying
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* support has been adapted from busybox-0.49pre's lash, which is
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* written by Erik Andersen <andersen@codepoet.org>. That, in turn,
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* is based in part on ladsh.c, by Michael K. Johnson and Erik W.
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* Troan, which they placed in the public domain. I don't know
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* how much of the Johnson/Troan code has survived the repeated
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* rewrites.
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*
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* Other credits:
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* b_addchr() derived from similar w_addchar function in glibc-2.2
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* setup_redirect(), redirect_opt_num(), and big chunks of main()
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* and many builtins derived from contributions by Erik Andersen
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* miscellaneous bugfixes from Matt Kraai
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*
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* There are two big (and related) architecture differences between
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* this parser and the lash parser. One is that this version is
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* actually designed from the ground up to understand nearly all
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* of the Bourne grammar. The second, consequential change is that
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* the parser and input reader have been turned inside out. Now,
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* the parser is in control, and asks for input as needed. The old
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* way had the input reader in control, and it asked for parsing to
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* take place as needed. The new way makes it much easier to properly
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* handle the recursion implicit in the various substitutions, especially
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* across continuation lines.
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*
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* Bash grammar not implemented: (how many of these were in original sh?)
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* $@ (those sure look like weird quoting rules)
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* $_
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* ! negation operator for pipes
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* &> and >& redirection of stdout+stderr
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* Brace Expansion
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* Tilde Expansion
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* fancy forms of Parameter Expansion
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* aliases
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* Arithmetic Expansion
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* <(list) and >(list) Process Substitution
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* reserved words: case, esac, select, function
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* Here Documents ( << word )
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* Functions
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* Major bugs:
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* job handling woefully incomplete and buggy
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* reserved word execution woefully incomplete and buggy
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* to-do:
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* port selected bugfixes from post-0.49 busybox lash - done?
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* finish implementing reserved words: for, while, until, do, done
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* change { and } from special chars to reserved words
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* builtins: break, continue, eval, return, set, trap, ulimit
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* test magic exec
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* handle children going into background
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* clean up recognition of null pipes
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* check setting of global_argc and global_argv
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* control-C handling, probably with longjmp
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* follow IFS rules more precisely, including update semantics
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* figure out what to do with backslash-newline
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* explain why we use signal instead of sigaction
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* propagate syntax errors, die on resource errors?
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* continuation lines, both explicit and implicit - done?
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* memory leak finding and plugging - done?
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* more testing, especially quoting rules and redirection
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* document how quoting rules not precisely followed for variable assignments
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* maybe change map[] to use 2-bit entries
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* (eventually) remove all the printf's
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "busybox.h"
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#include <glob.h> /* glob, of course */
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#include <getopt.h> /* should be pretty obvious */
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/* #include <dmalloc.h> */
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//#define DEBUG_SHELL
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/* Finer-grained debug switch */
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//#define DEBUG_SHELL_JOBS
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#define SPECIAL_VAR_SYMBOL 03
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#define FLAG_EXIT_FROM_LOOP 1
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#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
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#define FLAG_REPARSING (1 << 2) /* >=2nd pass */
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typedef enum {
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REDIRECT_INPUT = 1,
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REDIRECT_OVERWRITE = 2,
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REDIRECT_APPEND = 3,
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REDIRECT_HEREIS = 4,
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REDIRECT_IO = 5
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} redir_type;
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/* The descrip member of this structure is only used to make debugging
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* output pretty */
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static const struct {
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int mode;
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int default_fd;
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const char *descrip;
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} redir_table[] = {
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{ 0, 0, "()" },
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{ O_RDONLY, 0, "<" },
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{ O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
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{ O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
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{ O_RDONLY, -1, "<<" },
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{ O_RDWR, 1, "<>" }
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};
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typedef enum {
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PIPE_SEQ = 1,
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PIPE_AND = 2,
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PIPE_OR = 3,
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PIPE_BG = 4,
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} pipe_style;
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/* might eventually control execution */
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typedef enum {
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RES_NONE = 0,
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RES_IF = 1,
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RES_THEN = 2,
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RES_ELIF = 3,
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RES_ELSE = 4,
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RES_FI = 5,
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RES_FOR = 6,
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RES_WHILE = 7,
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RES_UNTIL = 8,
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RES_DO = 9,
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RES_DONE = 10,
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RES_XXXX = 11,
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RES_IN = 12,
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RES_SNTX = 13
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} reserved_style;
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enum {
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FLAG_END = (1 << RES_NONE ),
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FLAG_IF = (1 << RES_IF ),
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FLAG_THEN = (1 << RES_THEN ),
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FLAG_ELIF = (1 << RES_ELIF ),
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FLAG_ELSE = (1 << RES_ELSE ),
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FLAG_FI = (1 << RES_FI ),
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FLAG_FOR = (1 << RES_FOR ),
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FLAG_WHILE = (1 << RES_WHILE),
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FLAG_UNTIL = (1 << RES_UNTIL),
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FLAG_DO = (1 << RES_DO ),
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FLAG_DONE = (1 << RES_DONE ),
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FLAG_IN = (1 << RES_IN ),
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FLAG_START = (1 << RES_XXXX ),
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};
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/* This holds pointers to the various results of parsing */
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struct p_context {
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struct child_prog *child;
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struct pipe *list_head;
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struct pipe *pipe;
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struct redir_struct *pending_redirect;
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reserved_style w;
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int old_flag; /* for figuring out valid reserved words */
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struct p_context *stack;
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int type; /* define type of parser : ";$" common or special symbol */
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/* How about quoting status? */
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};
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struct redir_struct {
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redir_type type; /* type of redirection */
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int fd; /* file descriptor being redirected */
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int dup; /* -1, or file descriptor being duplicated */
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struct redir_struct *next; /* pointer to the next redirect in the list */
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glob_t word; /* *word.gl_pathv is the filename */
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};
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struct child_prog {
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pid_t pid; /* 0 if exited */
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char **argv; /* program name and arguments */
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struct pipe *group; /* if non-NULL, first in group or subshell */
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int subshell; /* flag, non-zero if group must be forked */
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struct redir_struct *redirects; /* I/O redirections */
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glob_t glob_result; /* result of parameter globbing */
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int is_stopped; /* is the program currently running? */
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struct pipe *family; /* pointer back to the child's parent pipe */
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int sp; /* number of SPECIAL_VAR_SYMBOL */
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int type;
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};
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struct pipe {
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int jobid; /* job number */
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int num_progs; /* total number of programs in job */
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int running_progs; /* number of programs running (not exited) */
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char *text; /* name of job */
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char *cmdbuf; /* buffer various argv's point into */
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pid_t pgrp; /* process group ID for the job */
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struct child_prog *progs; /* array of commands in pipe */
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struct pipe *next; /* to track background commands */
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int stopped_progs; /* number of programs alive, but stopped */
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int job_context; /* bitmask defining current context */
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pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
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reserved_style r_mode; /* supports if, for, while, until */
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};
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struct close_me {
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int fd;
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struct close_me *next;
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};
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struct variables {
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const char *name;
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const char *value;
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int flg_export;
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int flg_read_only;
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struct variables *next;
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};
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/* globals, connect us to the outside world
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* the first three support $?, $#, and $1 */
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static char **global_argv;
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static int global_argc;
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static int last_return_code;
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extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
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/* "globals" within this file */
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static const char *ifs;
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static unsigned char map[256];
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static int fake_mode;
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static struct close_me *close_me_head;
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static const char *cwd;
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static struct pipe *job_list;
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static unsigned last_bg_pid;
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static int last_jobid;
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/* 'interactive_fd' is a fd# open to ctty, if we have one
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* _AND_ if we decided to mess with job control */
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static int interactive_fd;
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static pid_t saved_task_pgrp;
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static pid_t saved_tty_pgrp;
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static const char *PS1;
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static const char *PS2;
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static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
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static struct variables *top_vars = &shell_ver;
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#define B_CHUNK (100)
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#define B_NOSPAC 1
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typedef struct {
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char *data;
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int length;
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int maxlen;
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int quote;
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int nonnull;
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} o_string;
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#define NULL_O_STRING {NULL,0,0,0,0}
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/* used for initialization:
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o_string foo = NULL_O_STRING; */
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/* I can almost use ordinary FILE *. Is open_memstream() universally
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* available? Where is it documented? */
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struct in_str {
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const char *p;
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char peek_buf[2];
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int __promptme;
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int promptmode;
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FILE *file;
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int (*get) (struct in_str *);
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int (*peek) (struct in_str *);
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};
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#define b_getch(input) ((input)->get(input))
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#define b_peek(input) ((input)->peek(input))
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#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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struct built_in_command {
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const char *cmd; /* name */
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const char *descr; /* description */
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int (*function) (char **argv); /* function ptr */
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};
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/* belongs in busybox.h */
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static int max(int a, int b)
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{
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return (a > b) ? a : b;
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}
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#ifdef DEBUG_SHELL
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#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
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/* broken, of course, but OK for testing */
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static char *indenter(int i)
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{
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static char blanks[] = " ";
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return &blanks[sizeof(blanks) - i - 1];
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}
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#else
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#define debug_printf(...) do {} while (0)
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#endif
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#ifdef DEBUG_SHELL_JOBS
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#define debug_jobs_printf(...) fprintf(stderr, __VA_ARGS__)
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#else
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#define debug_jobs_printf(...) do {} while (0)
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#endif
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#define final_printf debug_printf
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static void __syntax(const char *file, int line)
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{
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bb_error_msg("syntax error %s:%d", file, line);
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}
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/* NB: was __FILE__, but that produces full path sometimes, so... */
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#define syntax() __syntax("hush.c", __LINE__)
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/* Index of subroutines: */
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/* function prototypes for builtins */
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static int builtin_cd(char **argv);
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static int builtin_env(char **argv);
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static int builtin_eval(char **argv);
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static int builtin_exec(char **argv);
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static int builtin_exit(char **argv);
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static int builtin_export(char **argv);
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static int builtin_fg_bg(char **argv);
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static int builtin_help(char **argv);
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static int builtin_jobs(char **argv);
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static int builtin_pwd(char **argv);
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static int builtin_read(char **argv);
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static int builtin_set(char **argv);
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static int builtin_shift(char **argv);
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static int builtin_source(char **argv);
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static int builtin_umask(char **argv);
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static int builtin_unset(char **argv);
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static int builtin_not_written(char **argv);
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/* o_string manipulation: */
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static int b_check_space(o_string *o, int len);
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static int b_addchr(o_string *o, int ch);
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static void b_reset(o_string *o);
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static int b_addqchr(o_string *o, int ch, int quote);
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static int b_adduint(o_string *o, unsigned i);
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/* in_str manipulations: */
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static int static_get(struct in_str *i);
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static int static_peek(struct in_str *i);
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static int file_get(struct in_str *i);
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static int file_peek(struct in_str *i);
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static void setup_file_in_str(struct in_str *i, FILE *f);
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static void setup_string_in_str(struct in_str *i, const char *s);
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/* close_me manipulations: */
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static void mark_open(int fd);
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static void mark_closed(int fd);
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static void close_all(void);
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/* "run" the final data structures: */
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static int free_pipe_list(struct pipe *head, int indent);
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static int free_pipe(struct pipe *pi, int indent);
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/* really run the final data structures: */
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static int setup_redirects(struct child_prog *prog, int squirrel[]);
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static int run_list_real(struct pipe *pi);
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static void pseudo_exec_argv(char **argv) ATTRIBUTE_NORETURN;
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static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
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static int run_pipe_real(struct pipe *pi);
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/* extended glob support: */
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static int globhack(const char *src, int flags, glob_t *pglob);
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static int glob_needed(const char *s);
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static int xglob(o_string *dest, int flags, glob_t *pglob);
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/* variable assignment: */
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static int is_assignment(const char *s);
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/* data structure manipulation: */
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static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
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static void initialize_context(struct p_context *ctx);
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static int done_word(o_string *dest, struct p_context *ctx);
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static int done_command(struct p_context *ctx);
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static int done_pipe(struct p_context *ctx, pipe_style type);
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/* primary string parsing: */
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static int redirect_dup_num(struct in_str *input);
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static int redirect_opt_num(o_string *o);
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static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
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static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
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static const char *lookup_param(const char *src);
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static char *make_string(char **inp);
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static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
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static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
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static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
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/* setup: */
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static int parse_stream_outer(struct in_str *inp, int flag);
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static int parse_string_outer(const char *s, int flag);
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static int parse_file_outer(FILE *f);
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/* job management: */
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static int checkjobs(struct pipe* fg_pipe);
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static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
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static void insert_bg_job(struct pipe *pi);
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static void remove_bg_job(struct pipe *pi);
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static void delete_finished_bg_job(struct pipe *pi);
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/* local variable support */
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static char **make_list_in(char **inp, char *name);
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static char *insert_var_value(char *inp);
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static const char *get_local_var(const char *var);
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static int set_local_var(const char *s, int flg_export);
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static void unset_local_var(const char *name);
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/* Table of built-in functions. They can be forked or not, depending on
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* context: within pipes, they fork. As simple commands, they do not.
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* When used in non-forking context, they can change global variables
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* in the parent shell process. If forked, of course they cannot.
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* For example, 'unset foo | whatever' will parse and run, but foo will
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* still be set at the end. */
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static const struct built_in_command bltins[] = {
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{ "bg", "Resume a job in the background", builtin_fg_bg },
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{ "break", "Exit for, while or until loop", builtin_not_written },
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{ "cd", "Change working directory", builtin_cd },
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{ "continue", "Continue for, while or until loop", builtin_not_written },
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{ "env", "Print all environment variables", builtin_env },
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{ "eval", "Construct and run shell command", builtin_eval },
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{ "exec", "Exec command, replacing this shell with the exec'd process",
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builtin_exec },
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{ "exit", "Exit from shell()", builtin_exit },
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{ "export", "Set environment variable", builtin_export },
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{ "fg", "Bring job into the foreground", builtin_fg_bg },
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{ "jobs", "Lists the active jobs", builtin_jobs },
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{ "pwd", "Print current directory", builtin_pwd },
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{ "read", "Input environment variable", builtin_read },
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{ "return", "Return from a function", builtin_not_written },
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{ "set", "Set/unset shell local variables", builtin_set },
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{ "shift", "Shift positional parameters", builtin_shift },
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{ "trap", "Trap signals", builtin_not_written },
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{ "ulimit","Controls resource limits", builtin_not_written },
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{ "umask","Sets file creation mask", builtin_umask },
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{ "unset", "Unset environment variable", builtin_unset },
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{ ".", "Source-in and run commands in a file", builtin_source },
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{ "help", "List shell built-in commands", builtin_help },
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{ NULL, NULL, NULL }
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};
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/* Restores tty foreground process group, and exits.
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* May be called as signal handler for fatal signal
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* (will faithfully resend signal to itself, producing correct exit state)
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* or called directly with -EXITCODE.
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* We also call it if xfunc is exiting. */
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static void sigexit(int sig) ATTRIBUTE_NORETURN;
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static void sigexit(int sig)
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{
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sigset_t block_all;
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/* Disable all signals: job control, SIGPIPE, etc. */
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sigfillset(&block_all);
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sigprocmask(SIG_SETMASK, &block_all, NULL);
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if (interactive_fd)
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tcsetpgrp(interactive_fd, saved_tty_pgrp);
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/* Not a signal, just exit */
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if (sig <= 0)
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_exit(- sig);
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/* Enable only this sig and kill ourself with it */
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signal(sig, SIG_DFL);
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sigdelset(&block_all, sig);
|
|
sigprocmask(SIG_SETMASK, &block_all, NULL);
|
|
raise(sig);
|
|
_exit(1); /* Should not reach it */
|
|
}
|
|
|
|
/* Restores tty foreground process group, and exits. */
|
|
static void hush_exit(int exitcode) ATTRIBUTE_NORETURN;
|
|
static void hush_exit(int exitcode)
|
|
{
|
|
fflush(NULL); /* flush all streams */
|
|
sigexit(- (exitcode & 0xff));
|
|
}
|
|
|
|
/* Signals are grouped, we handle them in batches */
|
|
static void set_fatal_sighandler(void (*handler)(int))
|
|
{
|
|
signal(SIGILL , handler);
|
|
signal(SIGTRAP, handler);
|
|
signal(SIGABRT, handler);
|
|
signal(SIGFPE , handler);
|
|
signal(SIGBUS , handler);
|
|
signal(SIGSEGV, handler);
|
|
/* bash 3.2 seems to handle these just like 'fatal' ones,
|
|
* but _without_ printing signal name. TODO: mimic this too? */
|
|
signal(SIGHUP , handler);
|
|
signal(SIGPIPE, handler);
|
|
signal(SIGALRM, handler);
|
|
}
|
|
static void set_jobctrl_sighandler(void (*handler)(int))
|
|
{
|
|
signal(SIGTSTP, handler);
|
|
signal(SIGTTIN, handler);
|
|
signal(SIGTTOU, handler);
|
|
}
|
|
static void set_misc_sighandler(void (*handler)(int))
|
|
{
|
|
signal(SIGINT , handler);
|
|
signal(SIGQUIT, handler);
|
|
signal(SIGTERM, handler);
|
|
}
|
|
/* SIGCHLD is special and handled separately */
|
|
|
|
static const char *set_cwd(void)
|
|
{
|
|
if (cwd == bb_msg_unknown)
|
|
cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
|
|
cwd = xrealloc_getcwd_or_warn((char *)cwd);
|
|
if (!cwd)
|
|
cwd = bb_msg_unknown;
|
|
return cwd;
|
|
}
|
|
|
|
/* built-in 'eval' handler */
|
|
static int builtin_eval(char **argv)
|
|
{
|
|
char *str = NULL;
|
|
int rcode = EXIT_SUCCESS;
|
|
|
|
if (argv[1]) {
|
|
str = make_string(argv + 1);
|
|
parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
|
|
FLAG_PARSE_SEMICOLON);
|
|
free(str);
|
|
rcode = last_return_code;
|
|
}
|
|
return rcode;
|
|
}
|
|
|
|
/* built-in 'cd <path>' handler */
|
|
static int builtin_cd(char **argv)
|
|
{
|
|
char *newdir;
|
|
if (argv[1] == NULL)
|
|
newdir = getenv("HOME");
|
|
else
|
|
newdir = argv[1];
|
|
if (chdir(newdir)) {
|
|
printf("cd: %s: %s\n", newdir, strerror(errno));
|
|
return EXIT_FAILURE;
|
|
}
|
|
set_cwd();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'env' handler */
|
|
static int builtin_env(char **argv ATTRIBUTE_UNUSED)
|
|
{
|
|
/* TODO: call env applet's code instead */
|
|
char **e = environ;
|
|
if (e == NULL)
|
|
return EXIT_FAILURE;
|
|
while (*e) {
|
|
puts(*e++);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'exec' handler */
|
|
static int builtin_exec(char **argv)
|
|
{
|
|
if (argv[1] == NULL)
|
|
return EXIT_SUCCESS; /* Really? */
|
|
pseudo_exec_argv(argv + 1);
|
|
/* never returns */
|
|
}
|
|
|
|
/* built-in 'exit' handler */
|
|
static int builtin_exit(char **argv)
|
|
{
|
|
// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
|
|
//puts("exit"); /* bash does it */
|
|
|
|
if (argv[1] == NULL)
|
|
hush_exit(last_return_code);
|
|
/* mimic bash: exit 123abc == exit 255 + error msg */
|
|
xfunc_error_retval = 255;
|
|
/* bash: exit -2 == exit 254, no error msg */
|
|
hush_exit(xatoi(argv[1]));
|
|
}
|
|
|
|
/* built-in 'export VAR=value' handler */
|
|
static int builtin_export(char **argv)
|
|
{
|
|
int res = 0;
|
|
char *name = argv[1];
|
|
|
|
if (name == NULL) {
|
|
return builtin_env(argv);
|
|
}
|
|
|
|
name = strdup(name);
|
|
|
|
if (name) {
|
|
const char *value = strchr(name, '=');
|
|
|
|
if (!value) {
|
|
char *tmp;
|
|
/* They are exporting something without an =VALUE */
|
|
|
|
value = get_local_var(name);
|
|
if (value) {
|
|
size_t ln = strlen(name);
|
|
|
|
tmp = realloc(name, ln+strlen(value)+2);
|
|
if (tmp == NULL)
|
|
res = -1;
|
|
else {
|
|
sprintf(tmp+ln, "=%s", value);
|
|
name = tmp;
|
|
}
|
|
} else {
|
|
/* bash does not return an error when trying to export
|
|
* an undefined variable. Do likewise. */
|
|
res = 1;
|
|
}
|
|
}
|
|
}
|
|
if (res < 0)
|
|
bb_perror_msg("export");
|
|
else if (res == 0)
|
|
res = set_local_var(name, 1);
|
|
else
|
|
res = 0;
|
|
free(name);
|
|
return res;
|
|
}
|
|
|
|
/* built-in 'fg' and 'bg' handler */
|
|
static int builtin_fg_bg(char **argv)
|
|
{
|
|
int i, jobnum;
|
|
struct pipe *pi;
|
|
|
|
if (!interactive_fd)
|
|
return EXIT_FAILURE;
|
|
/* If they gave us no args, assume they want the last backgrounded task */
|
|
if (!argv[1]) {
|
|
for (pi = job_list; pi; pi = pi->next) {
|
|
if (pi->jobid == 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 = 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] == 'f') {
|
|
/* Put the job into the foreground. */
|
|
tcsetpgrp(interactive_fd, pi->pgrp);
|
|
}
|
|
|
|
/* Restart the processes in the job */
|
|
debug_jobs_printf("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
|
|
for (i = 0; i < pi->num_progs; i++) {
|
|
debug_jobs_printf("reviving pid %d\n", pi->progs[i].pid);
|
|
pi->progs[i].is_stopped = 0;
|
|
}
|
|
pi->stopped_progs = 0;
|
|
|
|
i = kill(- pi->pgrp, SIGCONT);
|
|
if (i < 0) {
|
|
if (errno == ESRCH) {
|
|
delete_finished_bg_job(pi);
|
|
} else {
|
|
bb_perror_msg("kill (SIGCONT)");
|
|
}
|
|
}
|
|
|
|
if (*argv[0] == 'f') {
|
|
remove_bg_job(pi);
|
|
return checkjobs_and_fg_shell(pi);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'help' handler */
|
|
static int builtin_help(char **argv ATTRIBUTE_UNUSED)
|
|
{
|
|
const struct built_in_command *x;
|
|
|
|
printf("\nBuilt-in commands:\n");
|
|
printf("-------------------\n");
|
|
for (x = bltins; x->cmd; x++) {
|
|
if (x->descr == NULL)
|
|
continue;
|
|
printf("%s\t%s\n", x->cmd, x->descr);
|
|
}
|
|
printf("\n\n");
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'jobs' handler */
|
|
static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
|
|
{
|
|
struct pipe *job;
|
|
const char *status_string;
|
|
|
|
for (job = job_list; job; job = job->next) {
|
|
if (job->running_progs == job->stopped_progs)
|
|
status_string = "Stopped";
|
|
else
|
|
status_string = "Running";
|
|
|
|
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'pwd' handler */
|
|
static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
|
|
{
|
|
puts(set_cwd());
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'read VAR' handler */
|
|
static int builtin_read(char **argv)
|
|
{
|
|
int res;
|
|
|
|
if (argv[1]) {
|
|
char string[BUFSIZ];
|
|
char *var = NULL;
|
|
|
|
string[0] = '\0'; /* In case stdin has only EOF */
|
|
/* read string */
|
|
fgets(string, sizeof(string), stdin);
|
|
chomp(string);
|
|
var = malloc(strlen(argv[1]) + strlen(string) + 2);
|
|
if (var) {
|
|
sprintf(var, "%s=%s", argv[1], string);
|
|
res = set_local_var(var, 0);
|
|
} else
|
|
res = -1;
|
|
if (res)
|
|
bb_perror_msg("read");
|
|
free(var); /* So not move up to avoid breaking errno */
|
|
return res;
|
|
}
|
|
do res = getchar(); while (res != '\n' && res != EOF);
|
|
return 0;
|
|
}
|
|
|
|
/* built-in 'set VAR=value' handler */
|
|
static int builtin_set(char **argv)
|
|
{
|
|
char *temp = argv[1];
|
|
struct variables *e;
|
|
|
|
if (temp == NULL)
|
|
for (e = top_vars; e; e = e->next)
|
|
printf("%s=%s\n", e->name, e->value);
|
|
else
|
|
set_local_var(temp, 0);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
|
|
/* Built-in 'shift' handler */
|
|
static int builtin_shift(char **argv)
|
|
{
|
|
int n = 1;
|
|
if (argv[1]) {
|
|
n = atoi(argv[1]);
|
|
}
|
|
if (n >= 0 && n < global_argc) {
|
|
/* XXX This probably breaks $0 */
|
|
global_argc -= n;
|
|
global_argv += n;
|
|
return EXIT_SUCCESS;
|
|
}
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Built-in '.' handler (read-in and execute commands from file) */
|
|
static int builtin_source(char **argv)
|
|
{
|
|
FILE *input;
|
|
int status;
|
|
|
|
if (argv[1] == NULL)
|
|
return EXIT_FAILURE;
|
|
|
|
/* XXX search through $PATH is missing */
|
|
input = fopen(argv[1], "r");
|
|
if (!input) {
|
|
bb_error_msg("cannot open '%s'", argv[1]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Now run the file */
|
|
/* XXX argv and argc are broken; need to save old global_argv
|
|
* (pointer only is OK!) on this stack frame,
|
|
* set global_argv=argv+1, recurse, and restore. */
|
|
mark_open(fileno(input));
|
|
status = parse_file_outer(input);
|
|
mark_closed(fileno(input));
|
|
fclose(input);
|
|
return status;
|
|
}
|
|
|
|
static int builtin_umask(char **argv)
|
|
{
|
|
mode_t new_umask;
|
|
const char *arg = argv[1];
|
|
char *end;
|
|
if (arg) {
|
|
new_umask = strtoul(arg, &end, 8);
|
|
if (*end != '\0' || end == arg) {
|
|
return EXIT_FAILURE;
|
|
}
|
|
} else {
|
|
new_umask = umask(0);
|
|
printf("%.3o\n", (unsigned) new_umask);
|
|
}
|
|
umask(new_umask);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* built-in 'unset VAR' handler */
|
|
static int builtin_unset(char **argv)
|
|
{
|
|
/* bash returned already true */
|
|
unset_local_var(argv[1]);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int builtin_not_written(char **argv)
|
|
{
|
|
printf("builtin_%s not written\n", argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
static int b_check_space(o_string *o, int len)
|
|
{
|
|
/* It would be easy to drop a more restrictive policy
|
|
* in here, such as setting a maximum string length */
|
|
if (o->length + len > o->maxlen) {
|
|
char *old_data = o->data;
|
|
/* assert(data == NULL || o->maxlen != 0); */
|
|
o->maxlen += max(2*len, B_CHUNK);
|
|
o->data = realloc(o->data, 1 + o->maxlen);
|
|
if (o->data == NULL) {
|
|
free(old_data);
|
|
}
|
|
}
|
|
return o->data == NULL;
|
|
}
|
|
|
|
static int b_addchr(o_string *o, int ch)
|
|
{
|
|
debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
|
|
if (b_check_space(o, 1))
|
|
return B_NOSPAC;
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
return 0;
|
|
}
|
|
|
|
static void b_reset(o_string *o)
|
|
{
|
|
o->length = 0;
|
|
o->nonnull = 0;
|
|
if (o->data != NULL)
|
|
*o->data = '\0';
|
|
}
|
|
|
|
static void b_free(o_string *o)
|
|
{
|
|
b_reset(o);
|
|
free(o->data);
|
|
o->data = NULL;
|
|
o->maxlen = 0;
|
|
}
|
|
|
|
/* My analysis of quoting semantics tells me that state information
|
|
* is associated with a destination, not a source.
|
|
*/
|
|
static int b_addqchr(o_string *o, int ch, int quote)
|
|
{
|
|
if (quote && strchr("*?[\\", ch)) {
|
|
int rc;
|
|
rc = b_addchr(o, '\\');
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
return b_addchr(o, ch);
|
|
}
|
|
|
|
static int b_adduint(o_string *o, unsigned i)
|
|
{
|
|
int r;
|
|
char buf[sizeof(unsigned)*3 + 1];
|
|
char *p = buf;
|
|
*(utoa_to_buf(i, buf, sizeof(buf))) = '\0';
|
|
/* no escape checking necessary */
|
|
do r = b_addchr(o, *p++); while (r == 0 && *p);
|
|
return r;
|
|
}
|
|
|
|
static int static_get(struct in_str *i)
|
|
{
|
|
int ch = *i->p++;
|
|
if (ch == '\0') return EOF;
|
|
return ch;
|
|
}
|
|
|
|
static int static_peek(struct in_str *i)
|
|
{
|
|
return *i->p;
|
|
}
|
|
|
|
static void cmdedit_set_initial_prompt(void)
|
|
{
|
|
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
|
PS1 = NULL;
|
|
#else
|
|
PS1 = getenv("PS1");
|
|
if (PS1 == NULL)
|
|
PS1 = "\\w \\$ ";
|
|
#endif
|
|
}
|
|
|
|
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 == 1) {
|
|
char *ns;
|
|
free((char*)PS1);
|
|
ns = xmalloc(strlen(cwd)+4);
|
|
sprintf(ns, "%s %s", cwd, (geteuid() != 0) ? "$ " : "# ");
|
|
prompt_str = ns;
|
|
PS1 = ns;
|
|
} else {
|
|
prompt_str = PS2;
|
|
}
|
|
#else
|
|
prompt_str = (promptmode == 1) ? PS1 : PS2;
|
|
#endif
|
|
debug_printf("result %s\n", prompt_str);
|
|
return prompt_str;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_EDITING
|
|
static line_input_t *line_input_state;
|
|
#endif
|
|
|
|
static void get_user_input(struct in_str *i)
|
|
{
|
|
const char *prompt_str;
|
|
static char the_command[BUFSIZ];
|
|
|
|
prompt_str = setup_prompt_string(i->promptmode);
|
|
#if ENABLE_FEATURE_EDITING
|
|
/*
|
|
** enable command line editing only while a command line
|
|
** is actually being read; otherwise, we'll end up bequeathing
|
|
** atexit() handlers and other unwanted stuff to our
|
|
** child processes (rob@sysgo.de)
|
|
*/
|
|
read_line_input(prompt_str, the_command, BUFSIZ, line_input_state);
|
|
#else
|
|
fputs(prompt_str, stdout);
|
|
fflush(stdout);
|
|
the_command[0] = fgetc(i->file);
|
|
the_command[1] = '\0';
|
|
#endif
|
|
fflush(stdout);
|
|
i->p = the_command;
|
|
}
|
|
|
|
/* This is the magic location that prints prompts
|
|
* and gets data back from the user */
|
|
static int file_get(struct in_str *i)
|
|
{
|
|
int ch;
|
|
|
|
ch = 0;
|
|
/* If there is data waiting, eat it up */
|
|
if (i->p && *i->p) {
|
|
ch = *i->p++;
|
|
} else {
|
|
/* need to double check i->file because we might be doing something
|
|
* more complicated by now, like sourcing or substituting. */
|
|
if (i->__promptme && interactive_fd && i->file == stdin) {
|
|
while (!i->p || !(interactive_fd && strlen(i->p))) {
|
|
get_user_input(i);
|
|
}
|
|
i->promptmode = 2;
|
|
i->__promptme = 0;
|
|
if (i->p && *i->p) {
|
|
ch = *i->p++;
|
|
}
|
|
} else {
|
|
ch = fgetc(i->file);
|
|
}
|
|
|
|
debug_printf("b_getch: got a %d\n", ch);
|
|
}
|
|
if (ch == '\n')
|
|
i->__promptme = 1;
|
|
return ch;
|
|
}
|
|
|
|
/* All the callers guarantee this routine will never be
|
|
* used right after a newline, so prompting is not needed.
|
|
*/
|
|
static int file_peek(struct in_str *i)
|
|
{
|
|
if (i->p && *i->p) {
|
|
return *i->p;
|
|
}
|
|
i->peek_buf[0] = fgetc(i->file);
|
|
i->peek_buf[1] = '\0';
|
|
i->p = i->peek_buf;
|
|
debug_printf("b_peek: got a %d\n", *i->p);
|
|
return *i->p;
|
|
}
|
|
|
|
static void setup_file_in_str(struct in_str *i, FILE *f)
|
|
{
|
|
i->peek = file_peek;
|
|
i->get = file_get;
|
|
i->__promptme = 1;
|
|
i->promptmode = 1;
|
|
i->file = f;
|
|
i->p = NULL;
|
|
}
|
|
|
|
static void setup_string_in_str(struct in_str *i, const char *s)
|
|
{
|
|
i->peek = static_peek;
|
|
i->get = static_get;
|
|
i->__promptme = 1;
|
|
i->promptmode = 1;
|
|
i->p = s;
|
|
}
|
|
|
|
static void mark_open(int fd)
|
|
{
|
|
struct close_me *new = xmalloc(sizeof(struct close_me));
|
|
new->fd = fd;
|
|
new->next = close_me_head;
|
|
close_me_head = new;
|
|
}
|
|
|
|
static void mark_closed(int fd)
|
|
{
|
|
struct close_me *tmp;
|
|
if (close_me_head == NULL || close_me_head->fd != fd)
|
|
bb_error_msg_and_die("corrupt close_me");
|
|
tmp = close_me_head;
|
|
close_me_head = close_me_head->next;
|
|
free(tmp);
|
|
}
|
|
|
|
static void close_all(void)
|
|
{
|
|
struct close_me *c;
|
|
for (c = close_me_head; c; c = c->next) {
|
|
close(c->fd);
|
|
}
|
|
close_me_head = NULL;
|
|
}
|
|
|
|
/* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
|
* and stderr if they are redirected. */
|
|
static int setup_redirects(struct child_prog *prog, int squirrel[])
|
|
{
|
|
int openfd, mode;
|
|
struct redir_struct *redir;
|
|
|
|
for (redir = prog->redirects; redir; redir = redir->next) {
|
|
if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
|
|
/* something went wrong in the parse. Pretend it didn't happen */
|
|
continue;
|
|
}
|
|
if (redir->dup == -1) {
|
|
mode = redir_table[redir->type].mode;
|
|
openfd = open_or_warn(redir->word.gl_pathv[0], mode);
|
|
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!) */
|
|
return 1;
|
|
}
|
|
} else {
|
|
openfd = redir->dup;
|
|
}
|
|
|
|
if (openfd != redir->fd) {
|
|
if (squirrel && redir->fd < 3) {
|
|
squirrel[redir->fd] = dup(redir->fd);
|
|
}
|
|
if (openfd == -3) {
|
|
close(openfd);
|
|
} else {
|
|
dup2(openfd, redir->fd);
|
|
if (redir->dup == -1)
|
|
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) {
|
|
/* No error checking. I sure wouldn't know what
|
|
* to do with an error if I found one! */
|
|
dup2(fd, i);
|
|
close(fd);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* never returns */
|
|
/* XXX no 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(char **argv)
|
|
{
|
|
int i, rcode;
|
|
char *p;
|
|
const struct built_in_command *x;
|
|
|
|
for (i = 0; is_assignment(argv[i]); i++) {
|
|
debug_printf("pid %d environment modification: %s\n",
|
|
getpid(), argv[i]);
|
|
// FIXME: vfork case??
|
|
p = insert_var_value(argv[i]);
|
|
putenv(strdup(p));
|
|
if (p != argv[i])
|
|
free(p);
|
|
}
|
|
argv += i;
|
|
/* If a variable is assigned in a forest, and nobody listens,
|
|
* was it ever really set?
|
|
*/
|
|
if (argv[0] == NULL) {
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
for (x = bltins; x->cmd; x++) {
|
|
if (strcmp(argv[0], x->cmd) == 0) {
|
|
debug_printf("builtin exec %s\n", argv[0]);
|
|
rcode = x->function(argv);
|
|
fflush(stdout);
|
|
_exit(rcode);
|
|
}
|
|
}
|
|
|
|
/* Check if the command matches any busybox internal commands
|
|
* ("applets") here.
|
|
* FIXME: This feature is not 100% safe, since
|
|
* BusyBox is not fully reentrant, so we have no guarantee the things
|
|
* from the .bss are still zeroed, or that things from .data are still
|
|
* at their defaults. We could exec ourself from /proc/self/exe, but I
|
|
* really dislike relying on /proc for things. We could exec ourself
|
|
* from global_argv[0], but if we are in a chroot, we may not be able
|
|
* to find ourself... */
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
debug_printf("running applet %s\n", argv[0]);
|
|
run_applet_and_exit(argv[0], argv);
|
|
// is it ok that run_applet_and_exit() does exit(), not _exit()?
|
|
// NB: IIRC on NOMMU we are after _vfork_, not fork!
|
|
#endif
|
|
debug_printf("exec of %s\n", argv[0]);
|
|
execvp(argv[0], argv);
|
|
bb_perror_msg("cannot exec '%s'", argv[0]);
|
|
_exit(1);
|
|
}
|
|
|
|
static void pseudo_exec(struct child_prog *child)
|
|
{
|
|
int rcode;
|
|
|
|
if (child->argv) {
|
|
pseudo_exec_argv(child->argv);
|
|
}
|
|
|
|
if (child->group) {
|
|
debug_printf("runtime nesting to group\n");
|
|
// FIXME: do not modify globals! Think vfork!
|
|
interactive_fd = 0; /* crucial!!!! */
|
|
rcode = run_list_real(child->group);
|
|
/* OK to leak memory by not calling free_pipe_list,
|
|
* since this process is about to exit */
|
|
_exit(rcode);
|
|
}
|
|
|
|
/* Can happen. See what bash does with ">foo" by itself. */
|
|
debug_printf("trying to pseudo_exec null command\n");
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
static void insert_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *thejob;
|
|
|
|
/* Linear search for the ID of the job to use */
|
|
pi->jobid = 1;
|
|
for (thejob = job_list; thejob; thejob = thejob->next)
|
|
if (thejob->jobid >= pi->jobid)
|
|
pi->jobid = thejob->jobid + 1;
|
|
|
|
/* add thejob to the list of running jobs */
|
|
if (!job_list) {
|
|
thejob = job_list = xmalloc(sizeof(*thejob));
|
|
} else {
|
|
for (thejob = job_list; thejob->next; thejob = thejob->next)
|
|
continue;
|
|
thejob->next = xmalloc(sizeof(*thejob));
|
|
thejob = thejob->next;
|
|
}
|
|
|
|
/* physically copy the struct job */
|
|
memcpy(thejob, pi, sizeof(struct pipe));
|
|
// (pi->num_progs+1) is one-too-many I think?
|
|
thejob->progs = xmalloc(sizeof(pi->progs[0]) * (pi->num_progs+1));
|
|
memcpy(thejob->progs, pi->progs, sizeof(pi->progs[0]) * (pi->num_progs+1));
|
|
thejob->next = NULL;
|
|
/*seems to be wrong:*/
|
|
/*thejob->running_progs = thejob->num_progs;*/
|
|
/*thejob->stopped_progs = 0;*/
|
|
thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
|
|
//if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
|
|
{
|
|
// FIXME: overflow check? and also trim the size, BUFSIZ can be 4K!
|
|
char *bar = thejob->text;
|
|
char **foo = pi->progs[0].argv;
|
|
if (foo)
|
|
while (*foo)
|
|
bar += sprintf(bar, "%s ", *foo++);
|
|
}
|
|
|
|
/* we don't wait for background thejobs to return -- append it
|
|
to the list of backgrounded thejobs and leave it alone */
|
|
printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
|
|
last_bg_pid = thejob->progs[0].pid;
|
|
last_jobid = thejob->jobid;
|
|
}
|
|
|
|
static void remove_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *prev_pipe;
|
|
|
|
if (pi == job_list) {
|
|
job_list = pi->next;
|
|
} else {
|
|
prev_pipe = job_list;
|
|
while (prev_pipe->next != pi)
|
|
prev_pipe = prev_pipe->next;
|
|
prev_pipe->next = pi->next;
|
|
}
|
|
if (job_list)
|
|
last_jobid = job_list->jobid;
|
|
else
|
|
last_jobid = 0;
|
|
}
|
|
|
|
/* remove a backgrounded job */
|
|
static void delete_finished_bg_job(struct pipe *pi)
|
|
{
|
|
remove_bg_job(pi);
|
|
pi->stopped_progs = 0;
|
|
free_pipe(pi, 0);
|
|
free(pi);
|
|
}
|
|
|
|
/* Checks 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;
|
|
int prognum = 0;
|
|
struct pipe *pi;
|
|
pid_t childpid;
|
|
int rcode = 0;
|
|
|
|
attributes = WUNTRACED;
|
|
if (fg_pipe == NULL) {
|
|
attributes |= WNOHANG;
|
|
}
|
|
|
|
/* 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!
|
|
*/
|
|
|
|
wait_more:
|
|
while ((childpid = waitpid(-1, &status, attributes)) > 0) {
|
|
const int dead = WIFEXITED(status) || WIFSIGNALED(status);
|
|
|
|
#ifdef DEBUG_SHELL_JOBS
|
|
if (WIFSTOPPED(status))
|
|
debug_jobs_printf("pid %d stopped by sig %d (exitcode %d)\n",
|
|
childpid, WSTOPSIG(status), WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
debug_jobs_printf("pid %d killed by sig %d (exitcode %d)\n",
|
|
childpid, WTERMSIG(status), WEXITSTATUS(status));
|
|
if (WIFEXITED(status))
|
|
debug_jobs_printf("pid %d exited, exitcode %d\n",
|
|
childpid, WEXITSTATUS(status));
|
|
#endif
|
|
/* Were we asked to wait for fg pipe? */
|
|
if (fg_pipe) {
|
|
int i;
|
|
for (i = 0; i < fg_pipe->num_progs; i++) {
|
|
debug_jobs_printf("check pid %d\n", fg_pipe->progs[i].pid);
|
|
if (fg_pipe->progs[i].pid == childpid) {
|
|
/* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
|
|
if (dead) {
|
|
fg_pipe->progs[i].pid = 0;
|
|
fg_pipe->running_progs--;
|
|
if (i == fg_pipe->num_progs-1)
|
|
/* last process gives overall exitstatus */
|
|
rcode = WEXITSTATUS(status);
|
|
} else {
|
|
fg_pipe->progs[i].is_stopped = 1;
|
|
fg_pipe->stopped_progs++;
|
|
}
|
|
debug_jobs_printf("fg_pipe: running_progs %d stopped_progs %d\n",
|
|
fg_pipe->running_progs, fg_pipe->stopped_progs);
|
|
if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
|
|
/* All processes in fg pipe have exited/stopped */
|
|
if (fg_pipe->running_progs)
|
|
insert_bg_job(fg_pipe);
|
|
return rcode;
|
|
}
|
|
/* There are still running processes in the fg pipe */
|
|
goto wait_more;
|
|
}
|
|
}
|
|
/* fall through to searching process in bg pipes */
|
|
}
|
|
|
|
/* We asked to wait for bg or orphaned children */
|
|
/* No need to remember exitcode in this case */
|
|
for (pi = job_list; pi; pi = pi->next) {
|
|
prognum = 0;
|
|
while (prognum < pi->num_progs) {
|
|
if (pi->progs[prognum].pid == childpid)
|
|
goto found_pi_and_prognum;
|
|
prognum++;
|
|
}
|
|
}
|
|
|
|
/* Happens when shell is used as init process (init=/bin/sh) */
|
|
debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
|
|
goto wait_more;
|
|
|
|
found_pi_and_prognum:
|
|
if (dead) {
|
|
/* child exited */
|
|
pi->progs[prognum].pid = 0;
|
|
pi->running_progs--;
|
|
if (!pi->running_progs) {
|
|
printf(JOB_STATUS_FORMAT, pi->jobid,
|
|
"Done", pi->text);
|
|
delete_finished_bg_job(pi);
|
|
}
|
|
} else {
|
|
/* child stopped */
|
|
pi->stopped_progs++;
|
|
pi->progs[prognum].is_stopped = 1;
|
|
}
|
|
}
|
|
|
|
/* wait found no children or failed */
|
|
|
|
if (childpid && errno != ECHILD)
|
|
bb_perror_msg("waitpid");
|
|
|
|
/* move the shell to the foreground */
|
|
//if (interactive_fd && tcsetpgrp(interactive_fd, getpgid(0)))
|
|
// bb_perror_msg("tcsetpgrp-2");
|
|
return rcode;
|
|
}
|
|
|
|
static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
|
|
{
|
|
pid_t p;
|
|
int rcode = checkjobs(fg_pipe);
|
|
/* Job finished, move the shell to the foreground */
|
|
p = getpgid(0);
|
|
debug_printf("fg'ing ourself: getpgid(0)=%d\n", (int)p);
|
|
if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
|
|
bb_perror_msg("tcsetpgrp-4a");
|
|
return rcode;
|
|
}
|
|
|
|
/* run_pipe_real() starts all the jobs, but doesn'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_real returns, and the exit code is provided as the
|
|
* return value.
|
|
*
|
|
* The input of the pipe is always stdin, the output is always
|
|
* stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
|
|
* because it tries to avoid running the command substitution in
|
|
* subshell, when that is in fact necessary. The subshell process
|
|
* now has its stdout directed to the input of the appropriate pipe,
|
|
* so this routine is noticeably simpler.
|
|
*/
|
|
static int run_pipe_real(struct pipe *pi)
|
|
{
|
|
int i;
|
|
int nextin, nextout;
|
|
int pipefds[2]; /* pipefds[0] is for reading */
|
|
struct child_prog *child;
|
|
const struct built_in_command *x;
|
|
char *p;
|
|
/* it is not always needed, but we aim to smaller code */
|
|
int squirrel[] = { -1, -1, -1 };
|
|
int rcode;
|
|
const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
|
|
|
|
nextin = 0;
|
|
pi->pgrp = -1;
|
|
pi->running_progs = 0;
|
|
pi->stopped_progs = 0;
|
|
|
|
/* Check if this is a simple builtin (not part of a pipe).
|
|
* Builtins within pipes have to fork anyway, and are handled in
|
|
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
|
|
*/
|
|
child = &(pi->progs[0]);
|
|
if (single_fg && child->group && child->subshell == 0) {
|
|
debug_printf("non-subshell grouping\n");
|
|
setup_redirects(child, squirrel);
|
|
/* XXX could we merge code with following builtin case,
|
|
* by creating a pseudo builtin that calls run_list_real? */
|
|
rcode = run_list_real(child->group);
|
|
restore_redirects(squirrel);
|
|
return rcode;
|
|
}
|
|
|
|
if (single_fg && child->argv != NULL) {
|
|
char **argv = child->argv;
|
|
|
|
for (i = 0; is_assignment(argv[i]); i++)
|
|
continue;
|
|
if (i != 0 && argv[i] == NULL) {
|
|
/* assignments, but no command: set the local environment */
|
|
for (i = 0; argv[i] != NULL; i++) {
|
|
/* Ok, this case is tricky. We have to decide if this is a
|
|
* local variable, or an already exported variable. If it is
|
|
* already exported, we have to export the new value. If it is
|
|
* not exported, we need only set this as a local variable.
|
|
* This junk is all to decide whether or not to export this
|
|
* variable. */
|
|
int export_me = 0;
|
|
char *name, *value;
|
|
name = xstrdup(argv[i]);
|
|
debug_printf("Local environment set: %s\n", name);
|
|
value = strchr(name, '=');
|
|
if (value)
|
|
*value = 0;
|
|
if (get_local_var(name)) {
|
|
export_me = 1;
|
|
}
|
|
free(name);
|
|
p = insert_var_value(argv[i]);
|
|
set_local_var(p, export_me);
|
|
if (p != argv[i])
|
|
free(p);
|
|
}
|
|
return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
|
|
}
|
|
for (i = 0; is_assignment(argv[i]); i++) {
|
|
p = insert_var_value(argv[i]);
|
|
putenv(strdup(p));
|
|
if (p != argv[i]) {
|
|
child->sp--;
|
|
free(p);
|
|
}
|
|
}
|
|
if (child->sp) {
|
|
char *str;
|
|
|
|
str = make_string(argv + i);
|
|
parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
|
|
free(str);
|
|
return last_return_code;
|
|
}
|
|
for (x = bltins; x->cmd; x++) {
|
|
if (strcmp(argv[i], x->cmd) == 0) {
|
|
if (x->function == builtin_exec && argv[i+1] == NULL) {
|
|
debug_printf("magic exec\n");
|
|
setup_redirects(child, NULL);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
debug_printf("builtin inline %s\n", argv[0]);
|
|
/* XXX 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 with glibc. */
|
|
setup_redirects(child, squirrel);
|
|
rcode = x->function(argv + i);
|
|
restore_redirects(squirrel);
|
|
return rcode;
|
|
}
|
|
}
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
{
|
|
// FIXME: applet runs like part of shell - for example, it ignores
|
|
// SIGINT! Try to Ctrl-C out of "rm -i"... doesn't work
|
|
const struct bb_applet *a = find_applet_by_name(argv[i]);
|
|
if (a && a->nofork) {
|
|
setup_redirects(child, squirrel);
|
|
rcode = run_nofork_applet(a, argv + i);
|
|
restore_redirects(squirrel);
|
|
return rcode;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Disable job control signals for shell (parent) and
|
|
* for initial child code after fork */
|
|
set_jobctrl_sighandler(SIG_IGN);
|
|
|
|
for (i = 0; i < pi->num_progs; i++) {
|
|
child = &(pi->progs[i]);
|
|
|
|
/* pipes are inserted between pairs of commands */
|
|
if ((i + 1) < pi->num_progs) {
|
|
if (pipe(pipefds) < 0)
|
|
bb_perror_msg_and_die("pipe");
|
|
nextout = pipefds[1];
|
|
} else {
|
|
nextout = 1;
|
|
pipefds[0] = -1;
|
|
}
|
|
|
|
/* XXX test for failed fork()? */
|
|
#if BB_MMU
|
|
child->pid = fork();
|
|
#else
|
|
child->pid = vfork();
|
|
#endif
|
|
if (!child->pid) { /* child */
|
|
/* Every child adds itself to new process group
|
|
* with pgid == pid of first child in pipe */
|
|
if (interactive_fd) {
|
|
if (pi->pgrp < 0) /* true for 1st process only */
|
|
pi->pgrp = getpid();
|
|
if (setpgid(0, pi->pgrp) == 0 && pi->followup != PIPE_BG) {
|
|
/* We do it in *every* child, not just first,
|
|
* to avoid races */
|
|
tcsetpgrp(interactive_fd, pi->pgrp);
|
|
}
|
|
/* Don't do pgrp restore anymore on fatal signals */
|
|
set_fatal_sighandler(SIG_DFL);
|
|
}
|
|
|
|
close_all();
|
|
if (nextin != 0) {
|
|
dup2(nextin, 0);
|
|
close(nextin);
|
|
}
|
|
if (nextout != 1) {
|
|
dup2(nextout, 1);
|
|
close(nextout);
|
|
}
|
|
if (pipefds[0] != -1) {
|
|
close(pipefds[0]); /* opposite end of our output pipe */
|
|
}
|
|
/* Like bash, explicit redirects override pipes,
|
|
* and the pipe fd is available for dup'ing. */
|
|
setup_redirects(child, NULL);
|
|
|
|
/* Restore default handlers just prior to exec */
|
|
set_jobctrl_sighandler(SIG_DFL);
|
|
set_misc_sighandler(SIG_DFL);
|
|
signal(SIGCHLD, SIG_DFL);
|
|
pseudo_exec(child);
|
|
}
|
|
|
|
pi->running_progs++;
|
|
|
|
/* Second and next children need to know pid of first one */
|
|
if (pi->pgrp < 0)
|
|
pi->pgrp = child->pid;
|
|
|
|
/* Don't check for errors. The child may be dead already,
|
|
* in which case setpgid returns error code EACCES. */
|
|
//why we do it at all?? child does it itself
|
|
//if (interactive_fd)
|
|
// setpgid(child->pid, pi->pgrp);
|
|
|
|
if (nextin != 0)
|
|
close(nextin);
|
|
if (nextout != 1)
|
|
close(nextout);
|
|
|
|
/* If there isn't another process, nextin is garbage
|
|
but it doesn't matter */
|
|
nextin = pipefds[0];
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int run_list_real(struct pipe *pi)
|
|
{
|
|
char *save_name = NULL;
|
|
char **list = NULL;
|
|
char **save_list = NULL;
|
|
struct pipe *rpipe;
|
|
int flag_rep = 0;
|
|
int save_num_progs;
|
|
int rcode = 0, flag_skip = 1;
|
|
int flag_restore = 0;
|
|
int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
|
|
reserved_style rmode, skip_more_in_this_rmode = RES_XXXX;
|
|
/* check syntax for "for" */
|
|
for (rpipe = pi; rpipe; rpipe = rpipe->next) {
|
|
if ((rpipe->r_mode == RES_IN || rpipe->r_mode == RES_FOR)
|
|
&& (rpipe->next == NULL)
|
|
) {
|
|
syntax();
|
|
return 1;
|
|
}
|
|
if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs->argv != NULL)
|
|
|| (rpipe->r_mode == RES_FOR && rpipe->next->r_mode != RES_IN)
|
|
) {
|
|
syntax();
|
|
return 1;
|
|
}
|
|
}
|
|
for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
|
|
if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL
|
|
|| pi->r_mode == RES_FOR
|
|
) {
|
|
flag_restore = 0;
|
|
if (!rpipe) {
|
|
flag_rep = 0;
|
|
rpipe = pi;
|
|
}
|
|
}
|
|
rmode = pi->r_mode;
|
|
debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n",
|
|
rmode, if_code, next_if_code, skip_more_in_this_rmode);
|
|
if (rmode == skip_more_in_this_rmode && flag_skip) {
|
|
if (pi->followup == PIPE_SEQ)
|
|
flag_skip = 0;
|
|
continue;
|
|
}
|
|
flag_skip = 1;
|
|
skip_more_in_this_rmode = RES_XXXX;
|
|
if (rmode == RES_THEN || rmode == RES_ELSE)
|
|
if_code = next_if_code;
|
|
if (rmode == RES_THEN && if_code)
|
|
continue;
|
|
if (rmode == RES_ELSE && !if_code)
|
|
continue;
|
|
if (rmode == RES_ELIF && !if_code)
|
|
break;
|
|
if (rmode == RES_FOR && pi->num_progs) {
|
|
if (!list) {
|
|
/* if no variable values after "in" we skip "for" */
|
|
if (!pi->next->progs->argv)
|
|
continue;
|
|
/* create list of variable values */
|
|
list = make_list_in(pi->next->progs->argv,
|
|
pi->progs->argv[0]);
|
|
save_list = list;
|
|
save_name = pi->progs->argv[0];
|
|
pi->progs->argv[0] = NULL;
|
|
flag_rep = 1;
|
|
}
|
|
if (!*list) {
|
|
free(pi->progs->argv[0]);
|
|
free(save_list);
|
|
list = NULL;
|
|
flag_rep = 0;
|
|
pi->progs->argv[0] = save_name;
|
|
pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
|
|
continue;
|
|
}
|
|
/* insert new value from list for variable */
|
|
if (pi->progs->argv[0])
|
|
free(pi->progs->argv[0]);
|
|
pi->progs->argv[0] = *list++;
|
|
pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
|
|
}
|
|
if (rmode == RES_IN)
|
|
continue;
|
|
if (rmode == RES_DO) {
|
|
if (!flag_rep)
|
|
continue;
|
|
}
|
|
if (rmode == RES_DONE) {
|
|
if (flag_rep) {
|
|
flag_restore = 1;
|
|
} else {
|
|
rpipe = NULL;
|
|
}
|
|
}
|
|
if (pi->num_progs == 0)
|
|
continue;
|
|
save_num_progs = pi->num_progs; /* save number of programs */
|
|
rcode = run_pipe_real(pi);
|
|
debug_printf("run_pipe_real returned %d\n", rcode);
|
|
if (rcode != -1) {
|
|
/* We only ran a builtin: rcode was set by the return value
|
|
* of run_pipe_real(), and we don't need to wait for anything. */
|
|
} else if (pi->followup == PIPE_BG) {
|
|
/* XXX check bash's behavior with nontrivial pipes */
|
|
/* XXX compute jobid */
|
|
/* XXX what does bash do with attempts to background builtins? */
|
|
insert_bg_job(pi);
|
|
rcode = EXIT_SUCCESS;
|
|
} else {
|
|
if (interactive_fd) {
|
|
rcode = checkjobs_and_fg_shell(pi);
|
|
} else {
|
|
rcode = checkjobs(pi);
|
|
}
|
|
debug_printf("checkjobs returned %d\n", rcode);
|
|
}
|
|
last_return_code = rcode;
|
|
pi->num_progs = save_num_progs; /* restore number of programs */
|
|
if (rmode == RES_IF || rmode == RES_ELIF)
|
|
next_if_code = rcode; /* can be overwritten a number of times */
|
|
if (rmode == RES_WHILE)
|
|
flag_rep = !last_return_code;
|
|
if (rmode == RES_UNTIL)
|
|
flag_rep = last_return_code;
|
|
if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
|
|
|| (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
|
|
) {
|
|
skip_more_in_this_rmode = rmode;
|
|
}
|
|
checkjobs(NULL);
|
|
}
|
|
return rcode;
|
|
}
|
|
|
|
/* return code is the exit status of the pipe */
|
|
static int free_pipe(struct pipe *pi, int indent)
|
|
{
|
|
char **p;
|
|
struct child_prog *child;
|
|
struct redir_struct *r, *rnext;
|
|
int a, i, ret_code = 0;
|
|
|
|
if (pi->stopped_progs > 0)
|
|
return ret_code;
|
|
final_printf("%s run pipe: (pid %d)\n", indenter(indent), getpid());
|
|
for (i = 0; i < pi->num_progs; i++) {
|
|
child = &pi->progs[i];
|
|
final_printf("%s command %d:\n", indenter(indent), i);
|
|
if (child->argv) {
|
|
for (a = 0, p = child->argv; *p; a++, p++) {
|
|
final_printf("%s argv[%d] = %s\n", indenter(indent), a, *p);
|
|
}
|
|
globfree(&child->glob_result);
|
|
child->argv = NULL;
|
|
} else if (child->group) {
|
|
final_printf("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
|
|
ret_code = free_pipe_list(child->group, indent+3);
|
|
final_printf("%s end group\n", indenter(indent));
|
|
} else {
|
|
final_printf("%s (nil)\n", indenter(indent));
|
|
}
|
|
for (r = child->redirects; r; r = rnext) {
|
|
final_printf("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
|
|
if (r->dup == -1) {
|
|
/* guard against the case >$FOO, where foo is unset or blank */
|
|
if (r->word.gl_pathv) {
|
|
final_printf(" %s\n", *r->word.gl_pathv);
|
|
globfree(&r->word);
|
|
}
|
|
} else {
|
|
final_printf("&%d\n", r->dup);
|
|
}
|
|
rnext = r->next;
|
|
free(r);
|
|
}
|
|
child->redirects = NULL;
|
|
}
|
|
free(pi->progs); /* children are an array, they get freed all at once */
|
|
pi->progs = NULL;
|
|
return ret_code;
|
|
}
|
|
|
|
static int free_pipe_list(struct pipe *head, int indent)
|
|
{
|
|
int rcode = 0; /* if list has no members */
|
|
struct pipe *pi, *next;
|
|
for (pi = head; pi; pi = next) {
|
|
final_printf("%s pipe reserved mode %d\n", indenter(indent), pi->r_mode);
|
|
rcode = free_pipe(pi, indent);
|
|
final_printf("%s pipe followup code %d\n", indenter(indent), pi->followup);
|
|
next = pi->next;
|
|
/*pi->next = NULL;*/
|
|
free(pi);
|
|
}
|
|
return rcode;
|
|
}
|
|
|
|
/* Select which version we will use */
|
|
static int run_list(struct pipe *pi)
|
|
{
|
|
int rcode = 0;
|
|
if (fake_mode == 0) {
|
|
rcode = run_list_real(pi);
|
|
}
|
|
/* free_pipe_list has the side effect of clearing memory
|
|
* In the long run that function can be merged with run_list_real,
|
|
* but doing that now would hobble the debugging effort. */
|
|
free_pipe_list(pi,0);
|
|
return rcode;
|
|
}
|
|
|
|
/* The API for glob is arguably broken. This routine pushes a non-matching
|
|
* string into the output structure, removing non-backslashed backslashes.
|
|
* If someone can prove me wrong, by performing this function within the
|
|
* original glob(3) api, feel free to rewrite this routine into oblivion.
|
|
* Return code (0 vs. GLOB_NOSPACE) matches glob(3).
|
|
* XXX broken if the last character is '\\', check that before calling.
|
|
*/
|
|
static int globhack(const char *src, int flags, glob_t *pglob)
|
|
{
|
|
int cnt = 0, pathc;
|
|
const char *s;
|
|
char *dest;
|
|
for (cnt = 1, s = src; s && *s; s++) {
|
|
if (*s == '\\') s++;
|
|
cnt++;
|
|
}
|
|
dest = malloc(cnt);
|
|
if (!dest)
|
|
return GLOB_NOSPACE;
|
|
if (!(flags & GLOB_APPEND)) {
|
|
pglob->gl_pathv = NULL;
|
|
pglob->gl_pathc = 0;
|
|
pglob->gl_offs = 0;
|
|
pglob->gl_offs = 0;
|
|
}
|
|
pathc = ++pglob->gl_pathc;
|
|
pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
|
|
if (pglob->gl_pathv == NULL)
|
|
return GLOB_NOSPACE;
|
|
pglob->gl_pathv[pathc-1] = dest;
|
|
pglob->gl_pathv[pathc] = NULL;
|
|
for (s = src; s && *s; s++, dest++) {
|
|
if (*s == '\\') s++;
|
|
*dest = *s;
|
|
}
|
|
*dest = '\0';
|
|
return 0;
|
|
}
|
|
|
|
/* XXX broken if the last character is '\\', check that before calling */
|
|
static int glob_needed(const char *s)
|
|
{
|
|
for (; *s; s++) {
|
|
if (*s == '\\') s++;
|
|
if (strchr("*[?", *s)) return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int xglob(o_string *dest, int flags, glob_t *pglob)
|
|
{
|
|
int gr;
|
|
|
|
/* short-circuit for null word */
|
|
/* we can code this better when the debug_printf's are gone */
|
|
if (dest->length == 0) {
|
|
if (dest->nonnull) {
|
|
/* bash man page calls this an "explicit" null */
|
|
gr = globhack(dest->data, flags, pglob);
|
|
debug_printf("globhack returned %d\n", gr);
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else if (glob_needed(dest->data)) {
|
|
gr = glob(dest->data, flags, NULL, pglob);
|
|
debug_printf("glob returned %d\n", gr);
|
|
if (gr == GLOB_NOMATCH) {
|
|
/* quote removal, or more accurately, backslash removal */
|
|
gr = globhack(dest->data, flags, pglob);
|
|
debug_printf("globhack returned %d\n", gr);
|
|
}
|
|
} else {
|
|
gr = globhack(dest->data, flags, pglob);
|
|
debug_printf("globhack returned %d\n", gr);
|
|
}
|
|
if (gr == GLOB_NOSPACE)
|
|
bb_error_msg_and_die("out of memory during glob");
|
|
if (gr != 0) { /* GLOB_ABORTED ? */
|
|
bb_error_msg("glob(3) error %d", gr);
|
|
}
|
|
/* globprint(glob_target); */
|
|
return gr;
|
|
}
|
|
|
|
static char **make_list_in(char **inp, char *name)
|
|
{
|
|
int len, i;
|
|
int name_len = strlen(name);
|
|
int n = 0;
|
|
char **list;
|
|
char *p1, *p2, *p3;
|
|
|
|
/* create list of variable values */
|
|
list = xmalloc(sizeof(*list));
|
|
for (i = 0; inp[i]; i++) {
|
|
p3 = insert_var_value(inp[i]);
|
|
p1 = p3;
|
|
while (*p1) {
|
|
if ((*p1 == ' ')) {
|
|
p1++;
|
|
continue;
|
|
}
|
|
p2 = strchr(p1, ' ');
|
|
if (p2) {
|
|
len = p2 - p1;
|
|
} else {
|
|
len = strlen(p1);
|
|
p2 = p1 + len;
|
|
}
|
|
/* we use n + 2 in realloc for list, because we add
|
|
* new element and then we will add NULL element */
|
|
list = xrealloc(list, sizeof(*list) * (n + 2));
|
|
list[n] = xmalloc(2 + name_len + len);
|
|
strcpy(list[n], name);
|
|
strcat(list[n], "=");
|
|
strncat(list[n], p1, len);
|
|
list[n++][name_len + len + 1] = '\0';
|
|
p1 = p2;
|
|
}
|
|
if (p3 != inp[i]) free(p3);
|
|
}
|
|
list[n] = NULL;
|
|
return list;
|
|
}
|
|
|
|
static char *insert_var_value(char *inp)
|
|
{
|
|
int res_str_len = 0;
|
|
int len;
|
|
int done = 0;
|
|
char *p, *res_str = NULL;
|
|
const char *p1;
|
|
|
|
while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
|
|
if (p != inp) {
|
|
len = p - inp;
|
|
res_str = xrealloc(res_str, (res_str_len + len));
|
|
strncpy((res_str + res_str_len), inp, len);
|
|
res_str_len += len;
|
|
}
|
|
inp = ++p;
|
|
p = strchr(inp, SPECIAL_VAR_SYMBOL);
|
|
*p = '\0';
|
|
p1 = lookup_param(inp);
|
|
if (p1) {
|
|
len = res_str_len + strlen(p1);
|
|
res_str = xrealloc(res_str, (1 + len));
|
|
strcpy((res_str + res_str_len), p1);
|
|
res_str_len = len;
|
|
}
|
|
*p = SPECIAL_VAR_SYMBOL;
|
|
inp = ++p;
|
|
done = 1;
|
|
}
|
|
if (done) {
|
|
res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
|
|
strcpy((res_str + res_str_len), inp);
|
|
while ((p = strchr(res_str, '\n'))) {
|
|
*p = ' ';
|
|
}
|
|
}
|
|
return (res_str == NULL) ? inp : res_str;
|
|
}
|
|
|
|
/* This is used to get/check local shell variables */
|
|
static const char *get_local_var(const char *s)
|
|
{
|
|
struct variables *cur;
|
|
|
|
if (!s)
|
|
return NULL;
|
|
for (cur = top_vars; cur; cur = cur->next)
|
|
if (strcmp(cur->name, s) == 0)
|
|
return cur->value;
|
|
return NULL;
|
|
}
|
|
|
|
/* This is used to set local shell variables
|
|
flg_export == 0 if only local (not exporting) variable
|
|
flg_export == 1 if "new" exporting environ
|
|
flg_export > 1 if current startup environ (not call putenv()) */
|
|
static int set_local_var(const char *s, int flg_export)
|
|
{
|
|
char *name, *value;
|
|
int result = 0;
|
|
struct variables *cur;
|
|
|
|
name = strdup(s);
|
|
|
|
/* Assume when we enter this function that we are already in
|
|
* NAME=VALUE format. So the first order of business is to
|
|
* split 's' on the '=' into 'name' and 'value' */
|
|
value = strchr(name, '=');
|
|
/*if (value == 0 && ++value == 0) ??? -vda */
|
|
if (value == NULL || value[1] == '\0') {
|
|
free(name);
|
|
return -1;
|
|
}
|
|
*value++ = '\0';
|
|
|
|
for (cur = top_vars; cur; cur = cur->next) {
|
|
if (strcmp(cur->name, name) == 0)
|
|
break;
|
|
}
|
|
|
|
if (cur) {
|
|
if (strcmp(cur->value, value) == 0) {
|
|
if (flg_export > 0 && cur->flg_export == 0)
|
|
cur->flg_export = flg_export;
|
|
else
|
|
result++;
|
|
} else if (cur->flg_read_only) {
|
|
bb_error_msg("%s: readonly variable", name);
|
|
result = -1;
|
|
} else {
|
|
if (flg_export > 0 || cur->flg_export > 1)
|
|
cur->flg_export = 1;
|
|
free((char*)cur->value);
|
|
|
|
cur->value = strdup(value);
|
|
}
|
|
} else {
|
|
cur = malloc(sizeof(struct variables));
|
|
if (!cur) {
|
|
result = -1;
|
|
} else {
|
|
cur->name = strdup(name);
|
|
if (cur->name) {
|
|
free(cur);
|
|
result = -1;
|
|
} else {
|
|
struct variables *bottom = top_vars;
|
|
cur->value = strdup(value);
|
|
cur->next = 0;
|
|
cur->flg_export = flg_export;
|
|
cur->flg_read_only = 0;
|
|
while (bottom->next)
|
|
bottom = bottom->next;
|
|
bottom->next = cur;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (result == 0 && cur->flg_export == 1) {
|
|
*(value-1) = '=';
|
|
result = putenv(name);
|
|
} else {
|
|
free(name);
|
|
if (result > 0) /* equivalent to previous set */
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void unset_local_var(const char *name)
|
|
{
|
|
struct variables *cur, *next;
|
|
|
|
if (!name)
|
|
return;
|
|
for (cur = top_vars; cur; cur = cur->next) {
|
|
if (strcmp(cur->name, name) == 0) {
|
|
if (cur->flg_read_only) {
|
|
bb_error_msg("%s: readonly variable", name);
|
|
return;
|
|
}
|
|
if (cur->flg_export)
|
|
unsetenv(cur->name);
|
|
free((char*)cur->name);
|
|
free((char*)cur->value);
|
|
next = top_vars;
|
|
while (next->next != cur)
|
|
next = next->next;
|
|
next->next = cur->next;
|
|
free(cur);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int is_assignment(const char *s)
|
|
{
|
|
if (!s || !isalpha(*s))
|
|
return 0;
|
|
s++;
|
|
while (isalnum(*s) || *s == '_')
|
|
s++;
|
|
return *s == '=';
|
|
}
|
|
|
|
/* the src parameter allows us to peek forward to a possible &n syntax
|
|
* for file descriptor duplication, e.g., "2>&1".
|
|
* Return code is 0 normally, 1 if a syntax error is detected in src.
|
|
* Resource errors (in xmalloc) cause the process to exit */
|
|
static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
|
|
struct in_str *input)
|
|
{
|
|
struct child_prog *child = ctx->child;
|
|
struct redir_struct *redir = child->redirects;
|
|
struct redir_struct *last_redir = NULL;
|
|
|
|
/* Create a new redir_struct and drop it onto the end of the linked list */
|
|
while (redir) {
|
|
last_redir = redir;
|
|
redir = redir->next;
|
|
}
|
|
redir = xmalloc(sizeof(struct redir_struct));
|
|
redir->next = NULL;
|
|
redir->word.gl_pathv = NULL;
|
|
if (last_redir) {
|
|
last_redir->next = redir;
|
|
} else {
|
|
child->redirects = redir;
|
|
}
|
|
|
|
redir->type = style;
|
|
redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
|
|
|
|
debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
|
|
|
|
/* Check for a '2>&1' type redirect */
|
|
redir->dup = redirect_dup_num(input);
|
|
if (redir->dup == -2) return 1; /* syntax error */
|
|
if (redir->dup != -1) {
|
|
/* 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("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
|
|
} else {
|
|
/* We do _not_ try to open the file that src points to,
|
|
* since we need to return and let src be expanded first.
|
|
* Set ctx->pending_redirect, so we know what to do at the
|
|
* end of the next parsed word.
|
|
*/
|
|
ctx->pending_redirect = redir;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct pipe *new_pipe(void)
|
|
{
|
|
struct pipe *pi;
|
|
pi = xmalloc(sizeof(struct pipe));
|
|
pi->num_progs = 0;
|
|
pi->progs = NULL;
|
|
pi->next = NULL;
|
|
pi->followup = 0; /* invalid */
|
|
pi->r_mode = RES_NONE;
|
|
return pi;
|
|
}
|
|
|
|
static void initialize_context(struct p_context *ctx)
|
|
{
|
|
ctx->pipe = NULL;
|
|
ctx->pending_redirect = NULL;
|
|
ctx->child = NULL;
|
|
ctx->list_head = new_pipe();
|
|
ctx->pipe = ctx->list_head;
|
|
ctx->w = RES_NONE;
|
|
ctx->stack = NULL;
|
|
ctx->old_flag = 0;
|
|
done_command(ctx); /* creates the memory for working child */
|
|
}
|
|
|
|
/* normal return is 0
|
|
* if a reserved word is found, and processed, return 1
|
|
* should handle if, then, elif, else, fi, for, while, until, do, done.
|
|
* case, function, and select are obnoxious, save those for later.
|
|
*/
|
|
static int reserved_word(o_string *dest, struct p_context *ctx)
|
|
{
|
|
struct reserved_combo {
|
|
char literal[7];
|
|
unsigned char code;
|
|
int flag;
|
|
};
|
|
/* 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", RES_IF, FLAG_THEN | FLAG_START },
|
|
{ "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
|
|
{ "elif", RES_ELIF, FLAG_THEN },
|
|
{ "else", RES_ELSE, FLAG_FI },
|
|
{ "fi", RES_FI, FLAG_END },
|
|
{ "for", RES_FOR, FLAG_IN | FLAG_START },
|
|
{ "while", RES_WHILE, FLAG_DO | FLAG_START },
|
|
{ "until", RES_UNTIL, FLAG_DO | FLAG_START },
|
|
{ "in", RES_IN, FLAG_DO },
|
|
{ "do", RES_DO, FLAG_DONE },
|
|
{ "done", RES_DONE, FLAG_END }
|
|
};
|
|
enum { NRES = sizeof(reserved_list)/sizeof(reserved_list[0]) };
|
|
const struct reserved_combo *r;
|
|
|
|
for (r = reserved_list; r < reserved_list+NRES; r++) {
|
|
if (strcmp(dest->data, r->literal) == 0) {
|
|
debug_printf("found reserved word %s, code %d\n", r->literal, r->code);
|
|
if (r->flag & FLAG_START) {
|
|
struct p_context *new = xmalloc(sizeof(struct p_context));
|
|
debug_printf("push stack\n");
|
|
if (ctx->w == RES_IN || ctx->w == RES_FOR) {
|
|
syntax();
|
|
free(new);
|
|
ctx->w = RES_SNTX;
|
|
b_reset(dest);
|
|
return 1;
|
|
}
|
|
*new = *ctx; /* physical copy */
|
|
initialize_context(ctx);
|
|
ctx->stack = new;
|
|
} else if (ctx->w == RES_NONE || !(ctx->old_flag & (1 << r->code))) {
|
|
syntax();
|
|
ctx->w = RES_SNTX;
|
|
b_reset(dest);
|
|
return 1;
|
|
}
|
|
ctx->w = r->code;
|
|
ctx->old_flag = r->flag;
|
|
if (ctx->old_flag & FLAG_END) {
|
|
struct p_context *old;
|
|
debug_printf("pop stack\n");
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
old = ctx->stack;
|
|
old->child->group = ctx->list_head;
|
|
old->child->subshell = 0;
|
|
*ctx = *old; /* physical copy */
|
|
free(old);
|
|
}
|
|
b_reset(dest);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* normal return is 0.
|
|
* Syntax or xglob errors return 1. */
|
|
static int done_word(o_string *dest, struct p_context *ctx)
|
|
{
|
|
struct child_prog *child = ctx->child;
|
|
glob_t *glob_target;
|
|
int gr, flags = 0;
|
|
|
|
debug_printf("done_word: %s %p\n", dest->data, child);
|
|
if (dest->length == 0 && !dest->nonnull) {
|
|
debug_printf(" true null, ignored\n");
|
|
return 0;
|
|
}
|
|
if (ctx->pending_redirect) {
|
|
glob_target = &ctx->pending_redirect->word;
|
|
} else {
|
|
if (child->group) {
|
|
syntax();
|
|
return 1; /* syntax error, groups and arglists don't mix */
|
|
}
|
|
if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
|
|
debug_printf("checking %s for reserved-ness\n", dest->data);
|
|
if (reserved_word(dest, ctx))
|
|
return (ctx->w == RES_SNTX);
|
|
}
|
|
glob_target = &child->glob_result;
|
|
if (child->argv) flags |= GLOB_APPEND;
|
|
}
|
|
gr = xglob(dest, flags, glob_target);
|
|
if (gr != 0) return 1;
|
|
|
|
b_reset(dest);
|
|
if (ctx->pending_redirect) {
|
|
ctx->pending_redirect = NULL;
|
|
if (glob_target->gl_pathc != 1) {
|
|
bb_error_msg("ambiguous redirect");
|
|
return 1;
|
|
}
|
|
} else {
|
|
child->argv = glob_target->gl_pathv;
|
|
}
|
|
if (ctx->w == RES_FOR) {
|
|
done_word(dest, ctx);
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* The only possible error here is out of memory, in which case
|
|
* xmalloc exits. */
|
|
static int done_command(struct p_context *ctx)
|
|
{
|
|
/* The child is really already in the pipe structure, so
|
|
* advance the pipe counter and make a new, null child.
|
|
* Only real trickiness here is that the uncommitted
|
|
* child structure, to which ctx->child points, is not
|
|
* counted in pi->num_progs. */
|
|
struct pipe *pi = ctx->pipe;
|
|
struct child_prog *prog = ctx->child;
|
|
|
|
if (prog && prog->group == NULL
|
|
&& prog->argv == NULL
|
|
&& prog->redirects == NULL
|
|
) {
|
|
debug_printf("done_command: skipping null command\n");
|
|
return 0;
|
|
}
|
|
if (prog) {
|
|
pi->num_progs++;
|
|
debug_printf("done_command: num_progs incremented to %d\n", pi->num_progs);
|
|
} else {
|
|
debug_printf("done_command: initializing\n");
|
|
}
|
|
pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
|
|
|
|
prog = pi->progs + pi->num_progs;
|
|
prog->redirects = NULL;
|
|
prog->argv = NULL;
|
|
prog->is_stopped = 0;
|
|
prog->group = NULL;
|
|
prog->glob_result.gl_pathv = NULL;
|
|
prog->family = pi;
|
|
prog->sp = 0;
|
|
ctx->child = prog;
|
|
prog->type = ctx->type;
|
|
|
|
/* but ctx->pipe and ctx->list_head remain unchanged */
|
|
return 0;
|
|
}
|
|
|
|
static int done_pipe(struct p_context *ctx, pipe_style type)
|
|
{
|
|
struct pipe *new_p;
|
|
done_command(ctx); /* implicit closure of previous command */
|
|
debug_printf("done_pipe, type %d\n", type);
|
|
ctx->pipe->followup = type;
|
|
ctx->pipe->r_mode = ctx->w;
|
|
new_p = new_pipe();
|
|
ctx->pipe->next = new_p;
|
|
ctx->pipe = new_p;
|
|
ctx->child = NULL;
|
|
done_command(ctx); /* set up new pipe to accept commands */
|
|
return 0;
|
|
}
|
|
|
|
/* peek ahead in the in_str to find out if we have a "&n" construct,
|
|
* as in "2>&1", that represents duplicating a file descriptor.
|
|
* returns either -2 (syntax error), -1 (no &), or the number found.
|
|
*/
|
|
static int redirect_dup_num(struct in_str *input)
|
|
{
|
|
int ch, d = 0, ok = 0;
|
|
ch = b_peek(input);
|
|
if (ch != '&') return -1;
|
|
|
|
b_getch(input); /* get the & */
|
|
ch = b_peek(input);
|
|
if (ch == '-') {
|
|
b_getch(input);
|
|
return -3; /* "-" represents "close me" */
|
|
}
|
|
while (isdigit(ch)) {
|
|
d = d*10 + (ch-'0');
|
|
ok = 1;
|
|
b_getch(input);
|
|
ch = b_peek(input);
|
|
}
|
|
if (ok) return d;
|
|
|
|
bb_error_msg("ambiguous redirect");
|
|
return -2;
|
|
}
|
|
|
|
/* 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
|
|
* A -1 output from this program means no valid number was found, so the
|
|
* caller should use the appropriate default for this redirection.
|
|
*/
|
|
static int redirect_opt_num(o_string *o)
|
|
{
|
|
int num;
|
|
|
|
if (o->length == 0)
|
|
return -1;
|
|
for (num = 0; num < o->length; num++) {
|
|
if (!isdigit(*(o->data + num))) {
|
|
return -1;
|
|
}
|
|
}
|
|
/* reuse num (and save an int) */
|
|
num = atoi(o->data);
|
|
b_reset(o);
|
|
return num;
|
|
}
|
|
|
|
static FILE *generate_stream_from_list(struct pipe *head)
|
|
{
|
|
FILE *pf;
|
|
int pid, channel[2];
|
|
if (pipe(channel) < 0) bb_perror_msg_and_die("pipe");
|
|
#if BB_MMU
|
|
pid = fork();
|
|
#else
|
|
pid = vfork();
|
|
#endif
|
|
if (pid < 0) {
|
|
bb_perror_msg_and_die("fork");
|
|
} else if (pid == 0) {
|
|
close(channel[0]);
|
|
if (channel[1] != 1) {
|
|
dup2(channel[1], 1);
|
|
close(channel[1]);
|
|
}
|
|
_exit(run_list_real(head)); /* leaks memory */
|
|
}
|
|
debug_printf("forked child %d\n", pid);
|
|
close(channel[1]);
|
|
pf = fdopen(channel[0], "r");
|
|
debug_printf("pipe on FILE *%p\n", pf);
|
|
return pf;
|
|
}
|
|
|
|
/* this version hacked for testing purposes */
|
|
/* return code is exit status of the process that is run. */
|
|
static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
|
|
{
|
|
int retcode;
|
|
o_string result = NULL_O_STRING;
|
|
struct p_context inner;
|
|
FILE *p;
|
|
struct in_str pipe_str;
|
|
initialize_context(&inner);
|
|
|
|
/* recursion to generate command */
|
|
retcode = parse_stream(&result, &inner, input, subst_end);
|
|
if (retcode != 0) return retcode; /* syntax error or EOF */
|
|
done_word(&result, &inner);
|
|
done_pipe(&inner, PIPE_SEQ);
|
|
b_free(&result);
|
|
|
|
p = generate_stream_from_list(inner.list_head);
|
|
if (p == NULL) return 1;
|
|
mark_open(fileno(p));
|
|
setup_file_in_str(&pipe_str, p);
|
|
|
|
/* now send results of command back into original context */
|
|
retcode = parse_stream(dest, ctx, &pipe_str, '\0');
|
|
/* XXX In case of a syntax error, should we try to kill the child?
|
|
* That would be tough to do right, so just read until EOF. */
|
|
if (retcode == 1) {
|
|
while (b_getch(&pipe_str) != EOF)
|
|
/* discard */;
|
|
}
|
|
|
|
debug_printf("done reading from pipe, pclose()ing\n");
|
|
/* This is the step that wait()s for the child. Should be pretty
|
|
* safe, since we just read an EOF from its stdout. We could try
|
|
* to better, by using wait(), and keeping track of background jobs
|
|
* at the same time. That would be a lot of work, and contrary
|
|
* to the KISS philosophy of this program. */
|
|
mark_closed(fileno(p));
|
|
retcode = pclose(p);
|
|
free_pipe_list(inner.list_head, 0);
|
|
debug_printf("pclosed, retcode=%d\n", retcode);
|
|
/* XXX this process fails to trim a single trailing newline */
|
|
return retcode;
|
|
}
|
|
|
|
static int parse_group(o_string *dest, struct p_context *ctx,
|
|
struct in_str *input, int ch)
|
|
{
|
|
int rcode, endch = 0;
|
|
struct p_context sub;
|
|
struct child_prog *child = ctx->child;
|
|
if (child->argv) {
|
|
syntax();
|
|
return 1; /* syntax error, groups and arglists don't mix */
|
|
}
|
|
initialize_context(&sub);
|
|
switch (ch) {
|
|
case '(':
|
|
endch = ')';
|
|
child->subshell = 1;
|
|
break;
|
|
case '{':
|
|
endch = '}';
|
|
break;
|
|
default:
|
|
syntax(); /* really logic error */
|
|
}
|
|
rcode = parse_stream(dest, &sub, input, endch);
|
|
done_word(dest, &sub); /* finish off the final word in the subcontext */
|
|
done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
|
|
child->group = sub.list_head;
|
|
return rcode;
|
|
/* child remains "open", available for possible redirects */
|
|
}
|
|
|
|
/* basically useful version until someone wants to get fancier,
|
|
* see the bash man page under "Parameter Expansion" */
|
|
static const char *lookup_param(const char *src)
|
|
{
|
|
const char *p = NULL;
|
|
if (src) {
|
|
p = getenv(src);
|
|
if (!p)
|
|
p = get_local_var(src);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
/* Make new string for parser */
|
|
static char* make_string(char ** inp)
|
|
{
|
|
char *p;
|
|
char *str = NULL;
|
|
int n;
|
|
int len = 2;
|
|
|
|
for (n = 0; inp[n]; n++) {
|
|
p = insert_var_value(inp[n]);
|
|
str = xrealloc(str, (len + strlen(p)));
|
|
if (n) {
|
|
strcat(str, " ");
|
|
} else {
|
|
*str = '\0';
|
|
}
|
|
strcat(str, p);
|
|
len = strlen(str) + 3;
|
|
if (p != inp[n]) free(p);
|
|
}
|
|
len = strlen(str);
|
|
str[len] = '\n';
|
|
str[len+1] = '\0';
|
|
return str;
|
|
}
|
|
|
|
/* return code: 0 for OK, 1 for syntax error */
|
|
static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
|
|
{
|
|
int i, advance = 0;
|
|
char sep[] = " ";
|
|
int ch = input->peek(input); /* first character after the $ */
|
|
debug_printf("handle_dollar: ch=%c\n", ch);
|
|
if (isalpha(ch)) {
|
|
b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
ctx->child->sp++;
|
|
while (ch = b_peek(input), isalnum(ch) || ch == '_') {
|
|
b_getch(input);
|
|
b_addchr(dest, ch);
|
|
}
|
|
b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
} else if (isdigit(ch)) {
|
|
i = ch - '0'; /* XXX is $0 special? */
|
|
if (i < global_argc) {
|
|
parse_string(dest, ctx, global_argv[i]); /* recursion */
|
|
}
|
|
advance = 1;
|
|
} else switch (ch) {
|
|
case '$':
|
|
b_adduint(dest, getpid());
|
|
advance = 1;
|
|
break;
|
|
case '!':
|
|
if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
|
|
advance = 1;
|
|
break;
|
|
case '?':
|
|
b_adduint(dest, last_return_code);
|
|
advance = 1;
|
|
break;
|
|
case '#':
|
|
b_adduint(dest, global_argc ? global_argc-1 : 0);
|
|
advance = 1;
|
|
break;
|
|
case '{':
|
|
b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
ctx->child->sp++;
|
|
b_getch(input);
|
|
/* XXX maybe someone will try to escape the '}' */
|
|
while (1) {
|
|
ch = b_getch(input);
|
|
if (ch == EOF || ch == '}')
|
|
break;
|
|
b_addchr(dest, ch);
|
|
}
|
|
if (ch != '}') {
|
|
syntax();
|
|
return 1;
|
|
}
|
|
b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
break;
|
|
case '(':
|
|
b_getch(input);
|
|
process_command_subs(dest, ctx, input, ')');
|
|
break;
|
|
case '*':
|
|
sep[0] = ifs[0];
|
|
for (i = 1; i < global_argc; i++) {
|
|
parse_string(dest, ctx, global_argv[i]);
|
|
if (i+1 < global_argc)
|
|
parse_string(dest, ctx, sep);
|
|
}
|
|
break;
|
|
case '@':
|
|
case '-':
|
|
case '_':
|
|
/* still unhandled, but should be eventually */
|
|
bb_error_msg("unhandled syntax: $%c", ch);
|
|
return 1;
|
|
break;
|
|
default:
|
|
b_addqchr(dest,'$', dest->quote);
|
|
}
|
|
/* Eat the character if the flag was set. If the compiler
|
|
* is smart enough, we could substitute "b_getch(input);"
|
|
* for all the "advance = 1;" above, and also end up with
|
|
* a nice size-optimized program. Hah! That'll be the day.
|
|
*/
|
|
if (advance) b_getch(input);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_string(o_string *dest, struct p_context *ctx, const char *src)
|
|
{
|
|
struct in_str foo;
|
|
setup_string_in_str(&foo, src);
|
|
return parse_stream(dest, ctx, &foo, '\0');
|
|
}
|
|
|
|
/* return code is 0 for normal exit, 1 for syntax error */
|
|
static int parse_stream(o_string *dest, struct p_context *ctx,
|
|
struct in_str *input, int end_trigger)
|
|
{
|
|
int ch, m;
|
|
int redir_fd;
|
|
redir_type redir_style;
|
|
int next;
|
|
|
|
/* Only double-quote state is handled in the state variable dest->quote.
|
|
* A single-quote triggers a bypass of the main loop until its mate is
|
|
* found. When recursing, quote state is passed in via dest->quote. */
|
|
|
|
debug_printf("parse_stream, end_trigger=%d\n", end_trigger);
|
|
while ((ch = b_getch(input)) != EOF) {
|
|
m = map[ch];
|
|
next = (ch == '\n') ? 0 : b_peek(input);
|
|
debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
|
|
ch, ch, m, dest->quote);
|
|
if (m == 0 || ((m == 1 || m == 2) && dest->quote)) {
|
|
b_addqchr(dest, ch, dest->quote);
|
|
continue;
|
|
}
|
|
if (m == 2) { /* unquoted IFS */
|
|
if (done_word(dest, ctx)) {
|
|
return 1;
|
|
}
|
|
/* If we aren't performing a substitution, treat a newline as a
|
|
* command separator. */
|
|
if (end_trigger != '\0' && ch == '\n')
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
if (ch == end_trigger && !dest->quote && ctx->w == RES_NONE) {
|
|
debug_printf("leaving parse_stream (triggered)\n");
|
|
return 0;
|
|
}
|
|
if (m == 2)
|
|
continue;
|
|
switch (ch) {
|
|
case '#':
|
|
if (dest->length == 0 && !dest->quote) {
|
|
while (1) {
|
|
ch = b_peek(input);
|
|
if (ch == EOF || ch == '\n')
|
|
break;
|
|
b_getch(input);
|
|
}
|
|
} else {
|
|
b_addqchr(dest, ch, dest->quote);
|
|
}
|
|
break;
|
|
case '\\':
|
|
if (next == EOF) {
|
|
syntax();
|
|
return 1;
|
|
}
|
|
b_addqchr(dest, '\\', dest->quote);
|
|
b_addqchr(dest, b_getch(input), dest->quote);
|
|
break;
|
|
case '$':
|
|
if (handle_dollar(dest, ctx, input) != 0) return 1;
|
|
break;
|
|
case '\'':
|
|
dest->nonnull = 1;
|
|
while (1) {
|
|
ch = b_getch(input);
|
|
if (ch == EOF || ch == '\'')
|
|
break;
|
|
b_addchr(dest, ch);
|
|
}
|
|
if (ch == EOF) {
|
|
syntax();
|
|
return 1;
|
|
}
|
|
break;
|
|
case '"':
|
|
dest->nonnull = 1;
|
|
dest->quote = !dest->quote;
|
|
break;
|
|
case '`':
|
|
process_command_subs(dest, ctx, input, '`');
|
|
break;
|
|
case '>':
|
|
redir_fd = redirect_opt_num(dest);
|
|
done_word(dest, ctx);
|
|
redir_style = REDIRECT_OVERWRITE;
|
|
if (next == '>') {
|
|
redir_style = REDIRECT_APPEND;
|
|
b_getch(input);
|
|
} else if (next == '(') {
|
|
syntax(); /* until we support >(list) Process Substitution */
|
|
return 1;
|
|
}
|
|
setup_redirect(ctx, redir_fd, redir_style, input);
|
|
break;
|
|
case '<':
|
|
redir_fd = redirect_opt_num(dest);
|
|
done_word(dest, ctx);
|
|
redir_style = REDIRECT_INPUT;
|
|
if (next == '<') {
|
|
redir_style = REDIRECT_HEREIS;
|
|
b_getch(input);
|
|
} else if (next == '>') {
|
|
redir_style = REDIRECT_IO;
|
|
b_getch(input);
|
|
} else if (next == '(') {
|
|
syntax(); /* until we support <(list) Process Substitution */
|
|
return 1;
|
|
}
|
|
setup_redirect(ctx, redir_fd, redir_style, input);
|
|
break;
|
|
case ';':
|
|
done_word(dest, ctx);
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
break;
|
|
case '&':
|
|
done_word(dest, ctx);
|
|
if (next == '&') {
|
|
b_getch(input);
|
|
done_pipe(ctx, PIPE_AND);
|
|
} else {
|
|
done_pipe(ctx, PIPE_BG);
|
|
}
|
|
break;
|
|
case '|':
|
|
done_word(dest, ctx);
|
|
if (next == '|') {
|
|
b_getch(input);
|
|
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);
|
|
}
|
|
break;
|
|
case '(':
|
|
case '{':
|
|
if (parse_group(dest, ctx, input, ch) != 0)
|
|
return 1;
|
|
break;
|
|
case ')':
|
|
case '}':
|
|
syntax(); /* Proper use of this character caught by end_trigger */
|
|
return 1;
|
|
default:
|
|
syntax(); /* this is really an internal logic error */
|
|
return 1;
|
|
}
|
|
}
|
|
/* complain if quote? No, maybe we just finished a command substitution
|
|
* that was quoted. Example:
|
|
* $ echo "`cat foo` plus more"
|
|
* and we just got the EOF generated by the subshell that ran "cat foo"
|
|
* The only real complaint is if we got an EOF when end_trigger != '\0',
|
|
* that is, we were really supposed to get end_trigger, and never got
|
|
* one before the EOF. Can't use the standard "syntax error" return code,
|
|
* so that parse_stream_outer can distinguish the EOF and exit smoothly. */
|
|
debug_printf("leaving parse_stream (EOF)\n");
|
|
if (end_trigger != '\0')
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static void mapset(const char *set, int code)
|
|
{
|
|
while (*set)
|
|
map[(unsigned char)*set++] = code;
|
|
}
|
|
|
|
static void update_ifs_map(void)
|
|
{
|
|
/* char *ifs and char map[256] are both globals. */
|
|
ifs = getenv("IFS");
|
|
if (ifs == NULL) ifs = " \t\n";
|
|
/* Precompute a list of 'flow through' behavior so it can be treated
|
|
* quickly up front. Computation is necessary because of IFS.
|
|
* Special case handling of IFS == " \t\n" is not implemented.
|
|
* The map[] array only really needs two bits each, and on most machines
|
|
* that would be faster because of the reduced L1 cache footprint.
|
|
*/
|
|
memset(map, 0, sizeof(map)); /* most characters flow through always */
|
|
mapset("\\$'\"`", 3); /* never flow through */
|
|
mapset("<>;&|(){}#", 1); /* flow through if quoted */
|
|
mapset(ifs, 2); /* also flow through if quoted */
|
|
}
|
|
|
|
/* most recursion does not come through here, the exception is
|
|
* from builtin_source() */
|
|
static int parse_stream_outer(struct in_str *inp, int flag)
|
|
{
|
|
struct p_context ctx;
|
|
o_string temp = NULL_O_STRING;
|
|
int rcode;
|
|
do {
|
|
ctx.type = flag;
|
|
initialize_context(&ctx);
|
|
update_ifs_map();
|
|
if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING))
|
|
mapset(";$&|", 0);
|
|
inp->promptmode = 1;
|
|
rcode = parse_stream(&temp, &ctx, inp, '\n');
|
|
if (rcode != 1 && ctx.old_flag != 0) {
|
|
syntax();
|
|
}
|
|
if (rcode != 1 && ctx.old_flag == 0) {
|
|
done_word(&temp, &ctx);
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
run_list(ctx.list_head);
|
|
} else {
|
|
if (ctx.old_flag != 0) {
|
|
free(ctx.stack);
|
|
b_reset(&temp);
|
|
}
|
|
temp.nonnull = 0;
|
|
temp.quote = 0;
|
|
inp->p = NULL;
|
|
free_pipe_list(ctx.list_head, 0);
|
|
}
|
|
b_free(&temp);
|
|
} while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
|
|
return 0;
|
|
}
|
|
|
|
static int parse_string_outer(const char *s, int flag)
|
|
{
|
|
struct in_str input;
|
|
setup_string_in_str(&input, s);
|
|
return parse_stream_outer(&input, flag);
|
|
}
|
|
|
|
static int parse_file_outer(FILE *f)
|
|
{
|
|
int rcode;
|
|
struct in_str input;
|
|
setup_file_in_str(&input, f);
|
|
rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
|
|
return rcode;
|
|
}
|
|
|
|
/* Make sure we have a controlling tty. If we get started under a job
|
|
* aware app (like bash for example), make sure we are now in charge so
|
|
* we don't fight over who gets the foreground */
|
|
static void setup_job_control(void)
|
|
{
|
|
pid_t shell_pgrp;
|
|
|
|
saved_task_pgrp = getpgrp();
|
|
debug_printf("saved_task_pgrp=%d\n", saved_task_pgrp);
|
|
fcntl(interactive_fd, F_SETFD, FD_CLOEXEC);
|
|
|
|
/* Loop until we are in the foreground. */
|
|
while (1) {
|
|
shell_pgrp = getpgrp();
|
|
if (tcgetpgrp(interactive_fd) == shell_pgrp)
|
|
break;
|
|
// and this does... what? need a comment here
|
|
kill(- shell_pgrp, SIGTTIN);
|
|
}
|
|
|
|
/* Ignore job-control and misc signals. */
|
|
set_jobctrl_sighandler(SIG_IGN);
|
|
set_misc_sighandler(SIG_IGN);
|
|
//huh? signal(SIGCHLD, SIG_IGN);
|
|
|
|
/* We _must_ do cleanup on fatal signals */
|
|
set_fatal_sighandler(sigexit);
|
|
|
|
/* Put ourselves in our own process group. */
|
|
shell_pgrp = getpid();
|
|
setpgrp(); /* is the same as setpgid(shell_pgrp, shell_pgrp); */
|
|
|
|
/* Grab control of the terminal. */
|
|
tcsetpgrp(interactive_fd, shell_pgrp);
|
|
}
|
|
|
|
int hush_main(int argc, char **argv);
|
|
int hush_main(int argc, char **argv)
|
|
{
|
|
int opt;
|
|
FILE *input;
|
|
char **e;
|
|
|
|
#if ENABLE_FEATURE_EDITING
|
|
line_input_state = new_line_input_t(FOR_SHELL);
|
|
#endif
|
|
|
|
/* XXX what should these be while sourcing /etc/profile? */
|
|
global_argc = argc;
|
|
global_argv = argv;
|
|
|
|
/* (re?) initialize globals. Sometimes hush_main() ends up calling
|
|
* hush_main(), therefore we cannot rely on the BSS to zero out this
|
|
* stuff. Reset these to 0 every time. */
|
|
ifs = NULL;
|
|
/* map[] is taken care of with call to update_ifs_map() */
|
|
fake_mode = 0;
|
|
interactive_fd = 0;
|
|
close_me_head = NULL;
|
|
last_bg_pid = 0;
|
|
job_list = NULL;
|
|
last_jobid = 0;
|
|
|
|
/* Initialize some more globals to non-zero values */
|
|
set_cwd();
|
|
if (ENABLE_FEATURE_EDITING)
|
|
cmdedit_set_initial_prompt();
|
|
else PS1 = NULL;
|
|
PS2 = "> ";
|
|
|
|
/* initialize our shell local variables with the values
|
|
* currently living in the environment */
|
|
e = environ;
|
|
if (e)
|
|
while (*e)
|
|
set_local_var(*e++, 2); /* without call putenv() */
|
|
|
|
last_return_code = EXIT_SUCCESS;
|
|
|
|
if (argv[0] && argv[0][0] == '-') {
|
|
debug_printf("\nsourcing /etc/profile\n");
|
|
input = fopen("/etc/profile", "r");
|
|
if (input != NULL) {
|
|
mark_open(fileno(input));
|
|
parse_file_outer(input);
|
|
mark_closed(fileno(input));
|
|
fclose(input);
|
|
}
|
|
}
|
|
input = stdin;
|
|
|
|
while ((opt = getopt(argc, argv, "c:xif")) > 0) {
|
|
switch (opt) {
|
|
case 'c':
|
|
global_argv = argv + optind;
|
|
global_argc = argc - optind;
|
|
opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
|
|
goto final_return;
|
|
case 'i':
|
|
// Well, we cannot just declare interactiveness,
|
|
// we have to have some stuff (ctty, etc)
|
|
/*interactive_fd++;*/
|
|
break;
|
|
case 'f':
|
|
fake_mode++;
|
|
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
|
|
}
|
|
}
|
|
/* 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 (argv[optind] == NULL && input == stdin
|
|
&& isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
|
|
) {
|
|
saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
|
|
debug_printf("saved_tty_pgrp=%d\n", saved_tty_pgrp);
|
|
if (saved_tty_pgrp >= 0) {
|
|
/* try to dup to high fd#, >= 255 */
|
|
interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
|
if (interactive_fd < 0) {
|
|
/* try to dup to any fd */
|
|
interactive_fd = dup(STDIN_FILENO);
|
|
if (interactive_fd < 0)
|
|
/* give up */
|
|
interactive_fd = 0;
|
|
}
|
|
// TODO: track & disallow any attempts of user
|
|
// to (inadvertently) close/redirect it
|
|
}
|
|
}
|
|
|
|
debug_printf("\ninteractive_fd=%d\n", interactive_fd);
|
|
if (interactive_fd) {
|
|
/* Looks like they want an interactive shell */
|
|
setup_job_control();
|
|
/* Make xfuncs do cleanup on exit */
|
|
die_sleep = -1; /* flag */
|
|
if (setjmp(die_jmp)) {
|
|
/* xfunc has failed! die die die */
|
|
hush_exit(xfunc_error_retval);
|
|
}
|
|
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
|
|
printf("\n\n%s hush - the humble shell v0.02\n", BB_BANNER);
|
|
printf("Enter 'help' for a list of built-in commands.\n\n");
|
|
#endif
|
|
}
|
|
|
|
if (argv[optind] == NULL) {
|
|
opt = parse_file_outer(stdin);
|
|
goto final_return;
|
|
}
|
|
|
|
debug_printf("\nrunning script '%s'\n", argv[optind]);
|
|
global_argv = argv + optind;
|
|
global_argc = argc - optind;
|
|
input = xfopen(argv[optind], "r");
|
|
opt = parse_file_outer(input);
|
|
|
|
#if ENABLE_FEATURE_CLEAN_UP
|
|
fclose(input);
|
|
if (cwd != bb_msg_unknown)
|
|
free((char*)cwd);
|
|
{
|
|
struct variables *cur, *tmp;
|
|
for (cur = top_vars; cur; cur = tmp) {
|
|
tmp = cur->next;
|
|
if (!cur->flg_read_only) {
|
|
free((char*)cur->name);
|
|
free((char*)cur->value);
|
|
free(cur);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
final_return:
|
|
hush_exit(opt ? opt : last_return_code);
|
|
}
|