158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini chmod implementation for busybox
|
|
*
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
*
|
|
* Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
|
|
* to correctly parse '-rwxgoa'
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
/* BB_AUDIT SUSv3 compliant */
|
|
/* BB_AUDIT GNU defects - unsupported long options. */
|
|
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
|
|
|
|
#include "busybox.h"
|
|
|
|
#define OPT_RECURSE (option_mask32 & 1)
|
|
#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
|
|
#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
|
|
#define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
|
|
#define OPT_STR "R" USE_DESKTOP("vcf")
|
|
|
|
/* coreutils:
|
|
* chmod never changes the permissions of symbolic links; the chmod
|
|
* system call cannot change their permissions. This is not a problem
|
|
* since the permissions of symbolic links are never used.
|
|
* However, for each symbolic link listed on the command line, chmod changes
|
|
* the permissions of the pointed-to file. In contrast, chmod ignores
|
|
* symbolic links encountered during recursive directory traversals.
|
|
*/
|
|
|
|
static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
|
|
{
|
|
mode_t newmode;
|
|
|
|
/* match coreutils behavior */
|
|
if (depth == 0) {
|
|
/* statbuf holds lstat result, but we need stat (follow link) */
|
|
if (stat(fileName, statbuf))
|
|
goto err;
|
|
} else { /* depth > 0: skip links */
|
|
if (S_ISLNK(statbuf->st_mode))
|
|
return TRUE;
|
|
}
|
|
newmode = statbuf->st_mode;
|
|
|
|
if (!bb_parse_mode((char *)param, &newmode))
|
|
bb_error_msg_and_die("invalid mode: %s", (char *)param);
|
|
|
|
if (chmod(fileName, newmode) == 0) {
|
|
if (OPT_VERBOSE
|
|
|| (OPT_CHANGED && statbuf->st_mode != newmode)
|
|
) {
|
|
printf("mode of '%s' changed to %04o (%s)\n", fileName,
|
|
newmode & 07777, bb_mode_string(newmode)+1);
|
|
}
|
|
return TRUE;
|
|
}
|
|
err:
|
|
if (!OPT_QUIET)
|
|
bb_perror_msg("%s", fileName);
|
|
return FALSE;
|
|
}
|
|
|
|
int chmod_main(int argc, char **argv)
|
|
{
|
|
int retval = EXIT_SUCCESS;
|
|
char *arg, **argp;
|
|
char *smode;
|
|
|
|
/* Convert first encountered -r into ar, -w into aw etc
|
|
* so that getopt would not eat it */
|
|
argp = argv;
|
|
while ((arg = *++argp)) {
|
|
/* Mode spec must be the first arg (sans -R etc) */
|
|
/* (protect against mishandling e.g. "chmod 644 -r") */
|
|
if (arg[0] != '-') {
|
|
arg = NULL;
|
|
break;
|
|
}
|
|
/* An option. Not a -- or valid option? */
|
|
if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
|
|
arg[0] = 'a';
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Parse options */
|
|
opt_complementary = "-2";
|
|
getopt32(argc, argv, ("-"OPT_STR) + 1); /* Reuse string */
|
|
argv += optind;
|
|
|
|
/* Restore option-like mode if needed */
|
|
if (arg) arg[0] = '-';
|
|
|
|
/* Ok, ready to do the deed now */
|
|
smode = *argv++;
|
|
do {
|
|
if (!recursive_action(*argv,
|
|
OPT_RECURSE, // recurse
|
|
FALSE, // follow links: coreutils doesn't
|
|
FALSE, // depth first
|
|
fileAction, // file action
|
|
fileAction, // dir action
|
|
smode, // user data
|
|
0) // depth
|
|
) {
|
|
retval = EXIT_FAILURE;
|
|
}
|
|
} while (*++argv);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
Security: chmod is too important and too subtle.
|
|
This is a test script (busybox chmod versus coreutils).
|
|
Run it in empty dir. Probably requires bash.
|
|
|
|
#!/bin/sh
|
|
function create() {
|
|
rm -rf $1; mkdir $1
|
|
(
|
|
cd $1 || exit 1
|
|
mkdir dir
|
|
>up
|
|
>file
|
|
>dir/file
|
|
ln -s dir linkdir
|
|
ln -s file linkfile
|
|
ln -s ../up dir/up
|
|
)
|
|
}
|
|
function tst() {
|
|
(cd test1; $t1 $1)
|
|
(cd test2; $t2 $1)
|
|
(cd test1; ls -lR) >out1
|
|
(cd test2; ls -lR) >out2
|
|
echo "chmod $1" >out.diff
|
|
if ! diff -u out1 out2 >>out.diff; then exit 1; fi
|
|
mv out.diff out1.diff
|
|
}
|
|
t1="/tmp/busybox chmod"
|
|
t2="/usr/bin/chmod"
|
|
create test1; create test2
|
|
tst "a+w file"
|
|
tst "a-w dir"
|
|
tst "a+w linkfile"
|
|
tst "a-w linkdir"
|
|
tst "-R a+w file"
|
|
tst "-R a-w dir"
|
|
tst "-R a+w linkfile"
|
|
tst "-R a-w linkdir"
|
|
tst "a-r,a+x linkfile"
|
|
*/
|