busybox/coreutils/test.c

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/* vi: set sw=4 ts=4: */
/*
* test implementation for busybox
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*
* Copyright (c) by a whole pile of folks:
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*
* test(1); version 7-like -- author Erik Baalbergen
* modified by Eric Gisin to be used as built-in.
* modified by Arnold Robbins to add SVR3 compatibility
* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
* modified by J.T. Conklin for NetBSD.
* modified by Herbert Xu to be used as built-in in ash.
* modified by Erik Andersen <andersen@codepoet.org> to be used
* in busybox.
* modified by Bernhard Reutner-Fischer to be useable (i.e. a bit less bloaty).
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*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
* Original copyright notice states:
* "This program is in the Public Domain."
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*/
//kbuild:lib-$(CONFIG_TEST) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_ASH) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_HUSH) += test.o test_ptr_hack.o
//config:config TEST
//config: bool "test"
//config: default y
//config: help
//config: test is used to check file types and compare values,
//config: returning an appropriate exit code. The bash shell
//config: has test built in, ash can build it in optionally.
//config:
//config:config FEATURE_TEST_64
//config: bool "Extend test to 64 bit"
//config: default y
//config: depends on TEST || ASH_BUILTIN_TEST || HUSH
//config: help
//config: Enable 64-bit support in test.
#include "libbb.h"
#include <setjmp.h>
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/* This is a NOFORK applet. Be very careful! */
/* test_main() is called from shells, and we need to be extra careful here.
* This is true regardless of PREFER_APPLETS and SH_STANDALONE
* state. */
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/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
nexpr ::= primary | "!" primary
primary ::= unary-operator operand
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| operand binary-operator operand
| operand
| "(" oexpr ")"
;
unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
binary-operator ::= "="|"=="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
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"-nt"|"-ot"|"-ef";
operand ::= <any legal UNIX file name>
*/
/* TODO: handle [[ expr ]] bashism bash-compatibly.
* [[ ]] is meant to be a "better [ ]", with less weird syntax
* and without the risk of variables and quoted strings misinterpreted
* as operators.
* This will require support from shells - we need to know quote status
* of each parameter (see below).
*
* Word splitting and pathname expansion should NOT be performed:
* # a="a b"; [[ $a = "a b" ]] && echo YES
* YES
* # [[ /bin/m* ]] && echo YES
* YES
*
* =~ should do regexp match
* = and == should do pattern match against right side:
* # [[ *a* == bab ]] && echo YES
* # [[ bab == *a* ]] && echo YES
* YES
* != does the negated == (i.e., also with pattern matching).
* Pattern matching is quotation-sensitive:
* # [[ bab == "b"a* ]] && echo YES
* YES
* # [[ bab == b"a*" ]] && echo YES
*
* Conditional operators such as -f must be unquoted literals to be recognized:
* # [[ -e /bin ]] && echo YES
* YES
* # [[ '-e' /bin ]] && echo YES
* bash: conditional binary operator expected...
* # A='-e'; [[ $A /bin ]] && echo YES
* bash: conditional binary operator expected...
*
* || and && should work as -o and -a work in [ ]
* -a and -o aren't recognized (&& and || are to be used instead)
* ( and ) do not need to be quoted unlike in [ ]:
* # [[ ( abc ) && '' ]] && echo YES
* # [[ ( abc ) || '' ]] && echo YES
* YES
* # [[ ( abc ) -o '' ]] && echo YES
* bash: syntax error in conditional expression...
*
* Apart from the above, [[ expr ]] should work as [ expr ]
*/
#define TEST_DEBUG 0
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enum token {
EOI,
FILRD, /* file access */
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FILWR,
FILEX,
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FILEXIST,
FILREG, /* file type */
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FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
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FILSYM,
FILGZ,
FILTT,
FILSUID, /* file bit */
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FILSGID,
FILSTCK,
FILNT, /* file ops */
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FILOT,
FILEQ,
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FILUID,
FILGID,
STREZ, /* str ops */
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STRNZ,
STREQ,
STRNE,
STRLT,
STRGT,
INTEQ, /* int ops */
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INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
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UNOT,
BAND,
BOR,
LPAREN,
RPAREN,
OPERAND
};
#define is_int_op(a) (((unsigned char)((a) - INTEQ)) <= 5)
#define is_str_op(a) (((unsigned char)((a) - STREZ)) <= 5)
#define is_file_op(a) (((unsigned char)((a) - FILNT)) <= 2)
#define is_file_access(a) (((unsigned char)((a) - FILRD)) <= 2)
#define is_file_type(a) (((unsigned char)((a) - FILREG)) <= 5)
#define is_file_bit(a) (((unsigned char)((a) - FILSUID)) <= 2)
#if TEST_DEBUG
int depth;
#define nest_msg(...) do { \
depth++; \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#define unnest_msg(...) do { \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
depth--; \
} while (0)
#define dbg_msg(...) do { \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#define unnest_msg_and_return(expr, ...) do { \
number_t __res = (expr); \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__, res); \
depth--; \
return __res; \
} while (0)
static const char *const TOKSTR[] = {
"EOI",
"FILRD",
"FILWR",
"FILEX",
"FILEXIST",
"FILREG",
"FILDIR",
"FILCDEV",
"FILBDEV",
"FILFIFO",
"FILSOCK",
"FILSYM",
"FILGZ",
"FILTT",
"FILSUID",
"FILSGID",
"FILSTCK",
"FILNT",
"FILOT",
"FILEQ",
"FILUID",
"FILGID",
"STREZ",
"STRNZ",
"STREQ",
"STRNE",
"STRLT",
"STRGT",
"INTEQ",
"INTNE",
"INTGE",
"INTGT",
"INTLE",
"INTLT",
"UNOT",
"BAND",
"BOR",
"LPAREN",
"RPAREN",
"OPERAND"
};
#else
#define nest_msg(...) ((void)0)
#define unnest_msg(...) ((void)0)
#define dbg_msg(...) ((void)0)
#define unnest_msg_and_return(expr, ...) return expr
#endif
enum {
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UNOP,
BINOP,
BUNOP,
BBINOP,
PAREN
};
struct operator_t {
unsigned char op_num, op_type;
};
static const struct operator_t ops_table[] = {
{ /* "-r" */ FILRD , UNOP },
{ /* "-w" */ FILWR , UNOP },
{ /* "-x" */ FILEX , UNOP },
{ /* "-e" */ FILEXIST, UNOP },
{ /* "-f" */ FILREG , UNOP },
{ /* "-d" */ FILDIR , UNOP },
{ /* "-c" */ FILCDEV , UNOP },
{ /* "-b" */ FILBDEV , UNOP },
{ /* "-p" */ FILFIFO , UNOP },
{ /* "-u" */ FILSUID , UNOP },
{ /* "-g" */ FILSGID , UNOP },
{ /* "-k" */ FILSTCK , UNOP },
{ /* "-s" */ FILGZ , UNOP },
{ /* "-t" */ FILTT , UNOP },
{ /* "-z" */ STREZ , UNOP },
{ /* "-n" */ STRNZ , UNOP },
{ /* "-h" */ FILSYM , UNOP }, /* for backwards compat */
{ /* "-O" */ FILUID , UNOP },
{ /* "-G" */ FILGID , UNOP },
{ /* "-L" */ FILSYM , UNOP },
{ /* "-S" */ FILSOCK , UNOP },
{ /* "=" */ STREQ , BINOP },
{ /* "==" */ STREQ , BINOP },
{ /* "!=" */ STRNE , BINOP },
{ /* "<" */ STRLT , BINOP },
{ /* ">" */ STRGT , BINOP },
{ /* "-eq"*/ INTEQ , BINOP },
{ /* "-ne"*/ INTNE , BINOP },
{ /* "-ge"*/ INTGE , BINOP },
{ /* "-gt"*/ INTGT , BINOP },
{ /* "-le"*/ INTLE , BINOP },
{ /* "-lt"*/ INTLT , BINOP },
{ /* "-nt"*/ FILNT , BINOP },
{ /* "-ot"*/ FILOT , BINOP },
{ /* "-ef"*/ FILEQ , BINOP },
{ /* "!" */ UNOT , BUNOP },
{ /* "-a" */ BAND , BBINOP },
{ /* "-o" */ BOR , BBINOP },
{ /* "(" */ LPAREN , PAREN },
{ /* ")" */ RPAREN , PAREN },
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};
/* Please keep these two tables in sync */
static const char ops_texts[] ALIGN1 =
"-r" "\0"
"-w" "\0"
"-x" "\0"
"-e" "\0"
"-f" "\0"
"-d" "\0"
"-c" "\0"
"-b" "\0"
"-p" "\0"
"-u" "\0"
"-g" "\0"
"-k" "\0"
"-s" "\0"
"-t" "\0"
"-z" "\0"
"-n" "\0"
"-h" "\0"
"-O" "\0"
"-G" "\0"
"-L" "\0"
"-S" "\0"
"=" "\0"
"==" "\0"
"!=" "\0"
"<" "\0"
">" "\0"
"-eq" "\0"
"-ne" "\0"
"-ge" "\0"
"-gt" "\0"
"-le" "\0"
"-lt" "\0"
"-nt" "\0"
"-ot" "\0"
"-ef" "\0"
"!" "\0"
"-a" "\0"
"-o" "\0"
"(" "\0"
")" "\0"
;
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#if ENABLE_FEATURE_TEST_64
typedef int64_t number_t;
#else
typedef int number_t;
#endif
/* We try to minimize both static and stack usage. */
struct test_statics {
char **args;
/* set only by check_operator(), either to bogus struct
* or points to matching operator_t struct. Never NULL. */
const struct operator_t *last_operator;
gid_t *group_array;
int ngroups;
jmp_buf leaving;
};
/* See test_ptr_hack.c */
extern struct test_statics *const test_ptr_to_statics;
#define S (*test_ptr_to_statics)
#define args (S.args )
#define last_operator (S.last_operator)
#define group_array (S.group_array )
#define ngroups (S.ngroups )
#define leaving (S.leaving )
#define INIT_S() do { \
(*(struct test_statics**)&test_ptr_to_statics) = xzalloc(sizeof(S)); \
barrier(); \
} while (0)
#define DEINIT_S() do { \
free(test_ptr_to_statics); \
} while (0)
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static number_t primary(enum token n);
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static void syntax(const char *op, const char *msg) NORETURN;
static void syntax(const char *op, const char *msg)
{
if (op && *op) {
bb_error_msg("%s: %s", op, msg);
} else {
bb_error_msg("%s: %s"+4, msg);
}
longjmp(leaving, 2);
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}
/* atoi with error detection */
//XXX: FIXME: duplicate of existing libbb function?
static number_t getn(const char *s)
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{
char *p;
#if ENABLE_FEATURE_TEST_64
long long r;
#else
long r;
#endif
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errno = 0;
#if ENABLE_FEATURE_TEST_64
r = strtoll(s, &p, 10);
#else
r = strtol(s, &p, 10);
#endif
if (errno != 0)
syntax(s, "out of range");
if (p == s || *(skip_whitespace(p)) != '\0')
syntax(s, "bad number");
return r;
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}
/* UNUSED
static int newerf(const char *f1, const char *f2)
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{
struct stat b1, b2;
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return (stat(f1, &b1) == 0 &&
stat(f2, &b2) == 0 && b1.st_mtime > b2.st_mtime);
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}
static int olderf(const char *f1, const char *f2)
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{
struct stat b1, b2;
return (stat(f1, &b1) == 0 &&
stat(f2, &b2) == 0 && b1.st_mtime < b2.st_mtime);
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}
static int equalf(const char *f1, const char *f2)
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{
struct stat b1, b2;
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return (stat(f1, &b1) == 0 &&
stat(f2, &b2) == 0 &&
b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino);
}
*/
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static enum token check_operator(const char *s)
{
static const struct operator_t no_op = {
.op_num = -1,
.op_type = -1
};
int n;
last_operator = &no_op;
if (s == NULL)
return EOI;
n = index_in_strings(ops_texts, s);
if (n < 0)
return OPERAND;
last_operator = &ops_table[n];
return ops_table[n].op_num;
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}
static int binop(void)
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{
const char *opnd1, *opnd2;
const struct operator_t *op;
number_t val1, val2;
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opnd1 = *args;
check_operator(*++args);
op = last_operator;
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opnd2 = *++args;
if (opnd2 == NULL)
syntax(args[-1], "argument expected");
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if (is_int_op(op->op_num)) {
val1 = getn(opnd1);
val2 = getn(opnd2);
if (op->op_num == INTEQ)
return val1 == val2;
if (op->op_num == INTNE)
return val1 != val2;
if (op->op_num == INTGE)
return val1 >= val2;
if (op->op_num == INTGT)
return val1 > val2;
if (op->op_num == INTLE)
return val1 <= val2;
/*if (op->op_num == INTLT)*/
return val1 < val2;
}
if (is_str_op(op->op_num)) {
val1 = strcmp(opnd1, opnd2);
if (op->op_num == STREQ)
return val1 == 0;
if (op->op_num == STRNE)
return val1 != 0;
if (op->op_num == STRLT)
return val1 < 0;
/*if (op->op_num == STRGT)*/
return val1 > 0;
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}
/* We are sure that these three are by now the only binops we didn't check
* yet, so we do not check if the class is correct:
*/
/* if (is_file_op(op->op_num)) */
{
struct stat b1, b2;
if (stat(opnd1, &b1) || stat(opnd2, &b2))
return 0; /* false, since at least one stat failed */
if (op->op_num == FILNT)
return b1.st_mtime > b2.st_mtime;
if (op->op_num == FILOT)
return b1.st_mtime < b2.st_mtime;
/*if (op->op_num == FILEQ)*/
return b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino;
}
/*return 1; - NOTREACHED */
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}
static void initialize_group_array(void)
{
int n;
/* getgroups may be expensive, try to use it only once */
ngroups = 32;
do {
/* FIXME: ash tries so hard to not die on OOM,
* and we spoil it with just one xrealloc here */
/* We realloc, because test_main can be entered repeatedly by shell.
* Testcase (ash): 'while true; do test -x some_file; done'
* and watch top. (some_file must have owner != you) */
n = ngroups;
group_array = xrealloc(group_array, n * sizeof(gid_t));
ngroups = getgroups(n, group_array);
} while (ngroups > n);
}
/* Return non-zero if GID is one that we have in our groups list. */
//XXX: FIXME: duplicate of existing libbb function?
// see toplevel TODO file:
// possible code duplication ingroup() and is_a_group_member()
static int is_a_group_member(gid_t gid)
{
int i;
/* Short-circuit if possible, maybe saving a call to getgroups(). */
if (gid == getgid() || gid == getegid())
return 1;
if (ngroups == 0)
initialize_group_array();
/* Search through the list looking for GID. */
for (i = 0; i < ngroups; i++)
if (gid == group_array[i])
return 1;
return 0;
}
/* Do the same thing access(2) does, but use the effective uid and gid,
and don't make the mistake of telling root that any file is
executable. */
static int test_eaccess(char *path, int mode)
{
struct stat st;
unsigned int euid = geteuid();
if (stat(path, &st) < 0)
return -1;
if (euid == 0) {
/* Root can read or write any file. */
if (mode != X_OK)
return 0;
/* Root can execute any file that has any one of the execute
bits set. */
if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
return 0;
}
if (st.st_uid == euid) /* owner */
mode <<= 6;
else if (is_a_group_member(st.st_gid))
mode <<= 3;
if (st.st_mode & mode)
return 0;
return -1;
}
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static int filstat(char *nm, enum token mode)
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{
struct stat s;
unsigned i = i; /* gcc 3.x thinks it can be used uninitialized */
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if (mode == FILSYM) {
#ifdef S_IFLNK
if (lstat(nm, &s) == 0) {
i = S_IFLNK;
goto filetype;
}
#endif
return 0;
}
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if (stat(nm, &s) != 0)
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return 0;
if (mode == FILEXIST)
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return 1;
if (is_file_access(mode)) {
if (mode == FILRD)
i = R_OK;
if (mode == FILWR)
i = W_OK;
if (mode == FILEX)
i = X_OK;
return test_eaccess(nm, i) == 0;
}
if (is_file_type(mode)) {
if (mode == FILREG)
i = S_IFREG;
if (mode == FILDIR)
i = S_IFDIR;
if (mode == FILCDEV)
i = S_IFCHR;
if (mode == FILBDEV)
i = S_IFBLK;
if (mode == FILFIFO) {
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#ifdef S_IFIFO
i = S_IFIFO;
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#else
return 0;
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#endif
}
if (mode == FILSOCK) {
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#ifdef S_IFSOCK
i = S_IFSOCK;
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#else
return 0;
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#endif
}
filetype:
return ((s.st_mode & S_IFMT) == i);
}
if (is_file_bit(mode)) {
if (mode == FILSUID)
i = S_ISUID;
if (mode == FILSGID)
i = S_ISGID;
if (mode == FILSTCK)
i = S_ISVTX;
return ((s.st_mode & i) != 0);
}
if (mode == FILGZ)
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return s.st_size > 0L;
if (mode == FILUID)
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return s.st_uid == geteuid();
if (mode == FILGID)
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return s.st_gid == getegid();
return 1; /* NOTREACHED */
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}
static number_t nexpr(enum token n)
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{
number_t res;
nest_msg(">nexpr(%s)\n", TOKSTR[n]);
if (n == UNOT) {
n = check_operator(*++args);
if (n == EOI) {
/* special case: [ ! ], [ a -a ! ] are valid */
/* IOW, "! ARG" may miss ARG */
unnest_msg("<nexpr:1 (!EOI)\n");
return 1;
}
res = !nexpr(n);
unnest_msg("<nexpr:%lld\n", res);
return res;
}
res = primary(n);
unnest_msg("<nexpr:%lld\n", res);
return res;
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}
static number_t aexpr(enum token n)
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{
number_t res;
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nest_msg(">aexpr(%s)\n", TOKSTR[n]);
res = nexpr(n);
dbg_msg("aexpr: nexpr:%lld, next args:%s\n", res, args[1]);
if (check_operator(*++args) == BAND) {
dbg_msg("aexpr: arg is AND, next args:%s\n", args[1]);
res = aexpr(check_operator(*++args)) && res;
unnest_msg("<aexpr:%lld\n", res);
return res;
}
args--;
unnest_msg("<aexpr:%lld, args:%s\n", res, args[0]);
return res;
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}
static number_t oexpr(enum token n)
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{
number_t res;
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nest_msg(">oexpr(%s)\n", TOKSTR[n]);
res = aexpr(n);
dbg_msg("oexpr: aexpr:%lld, next args:%s\n", res, args[1]);
if (check_operator(*++args) == BOR) {
dbg_msg("oexpr: next arg is OR, next args:%s\n", args[1]);
res = oexpr(check_operator(*++args)) || res;
unnest_msg("<oexpr:%lld\n", res);
return res;
}
args--;
unnest_msg("<oexpr:%lld, args:%s\n", res, args[0]);
return res;
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}
static number_t primary(enum token n)
{
#if TEST_DEBUG
number_t res = res; /* for compiler */
#else
number_t res;
#endif
const struct operator_t *args0_op;
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nest_msg(">primary(%s)\n", TOKSTR[n]);
if (n == EOI) {
syntax(NULL, "argument expected");
}
if (n == LPAREN) {
res = oexpr(check_operator(*++args));
if (check_operator(*++args) != RPAREN)
syntax(NULL, "closing paren expected");
unnest_msg("<primary:%lld\n", res);
return res;
}
/* coreutils 6.9 checks "is args[1] binop and args[2] exist?" first,
* do the same */
args0_op = last_operator;
/* last_operator = operator at args[1] */
if (check_operator(args[1]) != EOI) { /* if args[1] != NULL */
if (args[2]) {
// coreutils also does this:
// if (args[3] && args[0]="-l" && args[2] is BINOP)
// return binop(1 /* prepended by -l */);
if (last_operator->op_type == BINOP)
unnest_msg_and_return(binop(), "<primary: binop:%lld\n");
}
}
/* check "is args[0] unop?" second */
if (args0_op->op_type == UNOP) {
/* unary expression */
if (args[1] == NULL)
// syntax(args0_op->op_text, "argument expected");
goto check_emptiness;
args++;
if (n == STREZ)
unnest_msg_and_return(args[0][0] == '\0', "<primary:%lld\n");
if (n == STRNZ)
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
if (n == FILTT)
unnest_msg_and_return(isatty(getn(*args)), "<primary: isatty(%s)%lld\n", *args);
unnest_msg_and_return(filstat(*args, n), "<primary: filstat(%s):%lld\n", *args);
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}
/*check_operator(args[1]); - already done */
if (last_operator->op_type == BINOP) {
/* args[2] is known to be NULL, isn't it bound to fail? */
unnest_msg_and_return(binop(), "<primary:%lld\n");
}
check_emptiness:
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
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}
int test_main(int argc, char **argv)
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{
int res;
const char *arg0;
// bool negate = 0;
arg0 = bb_basename(argv[0]);
if (arg0[0] == '[') {
--argc;
if (!arg0[1]) { /* "[" ? */
if (NOT_LONE_CHAR(argv[argc], ']')) {
bb_error_msg("missing ]");
return 2;
}
} else { /* assuming "[[" */
if (strcmp(argv[argc], "]]") != 0) {
bb_error_msg("missing ]]");
return 2;
}
}
argv[argc] = NULL;
}
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/* We must do DEINIT_S() prior to returning */
INIT_S();
res = setjmp(leaving);
if (res)
goto ret;
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/* resetting ngroups is probably unnecessary. it will
* force a new call to getgroups(), which prevents using
* group data fetched during a previous call. but the
* only way the group data could be stale is if there's
* been an intervening call to setgroups(), and this
* isn't likely in the case of a shell. paranoia
* prevails...
*/
/*ngroups = 0; - done by INIT_S() */
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//argc--;
argv++;
/* Implement special cases from POSIX.2, section 4.62.4 */
if (!argv[0]) { /* "test" */
res = 1;
goto ret;
}
#if 0
// Now it's fixed in the parser and should not be needed
if (LONE_CHAR(argv[0], '!') && argv[1]) {
negate = 1;
//argc--;
argv++;
}
if (!argv[1]) { /* "test [!] arg" */
res = (*argv[0] == '\0');
goto ret;
}
if (argv[2] && !argv[3]) {
check_operator(argv[1]);
if (last_operator->op_type == BINOP) {
/* "test [!] arg1 <binary_op> arg2" */
args = argv;
res = (binop() == 0);
goto ret;
}
}
/* Some complex expression. Undo '!' removal */
if (negate) {
negate = 0;
//argc++;
argv--;
}
#endif
args = argv;
res = !oexpr(check_operator(*args));
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if (*args != NULL && *++args != NULL) {
/* Examples:
* test 3 -lt 5 6
* test -t 1 2
*/
bb_error_msg("%s: unknown operand", *args);
res = 2;
}
ret:
DEINIT_S();
// return negate ? !res : res;
return res;
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}