* 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config CHMOD
+//config: bool "chmod (5.5 kb)"
+//config: default y
+//config: help
+//config: chmod is used to change the access permission of files.
+
+//applet:IF_CHMOD(APPLET_NOEXEC(chmod, chmod, BB_DIR_BIN, BB_SUID_DROP, chmod))
+
+//kbuild:lib-$(CONFIG_CHMOD) += chmod.o
/* BB_AUDIT SUSv3 compliant */
-/* BB_AUDIT GNU defects - unsupported options -c, -f, -v, and long options. */
+/* BB_AUDIT GNU defects - unsupported long options. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include "busybox.h"
+//usage:#define chmod_trivial_usage
+//usage: "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."
+//usage:#define chmod_full_usage "\n\n"
+//usage: "Each MODE is one or more of the letters ugoa, one of the\n"
+//usage: "symbols +-= and one or more of the letters rwxst\n"
+//usage: "\n -R Recurse"
+//usage: IF_DESKTOP(
+//usage: "\n -c List changed files"
+//usage: "\n -v List all files"
+//usage: "\n -f Hide errors"
+//usage: )
+//usage:
+//usage:#define chmod_example_usage
+//usage: "$ ls -l /tmp/foo\n"
+//usage: "-rw-rw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
+//usage: "$ chmod u+x /tmp/foo\n"
+//usage: "$ ls -l /tmp/foo\n"
+//usage: "-rwxrw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo*\n"
+//usage: "$ chmod 444 /tmp/foo\n"
+//usage: "$ ls -l /tmp/foo\n"
+//usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+
+#define OPT_RECURSE (option_mask32 & 1)
+#define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))
+#define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))
+#define OPT_QUIET (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))
+#define OPT_STR "R" IF_DESKTOP("vcf")
-static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
+/* 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 FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
{
- if (!bb_parse_mode((char *)junk, &(statbuf->st_mode)))
- bb_error_msg_and_die( "invalid mode: %s", (char *)junk);
- if (chmod(fileName, statbuf->st_mode) == 0)
- return (TRUE);
- bb_perror_msg("%s", fileName); /* Avoid multibyte problems. */
- return (FALSE);
+ 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 = bb_parse_mode((char *)param, statbuf->st_mode);
+ if (newmode == (mode_t)-1)
+ 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_simple_perror_msg(fileName);
+ return FALSE;
}
-int chmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
+int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int chmod_main(int argc UNUSED_PARAM, char **argv)
{
int retval = EXIT_SUCCESS;
- int recursiveFlag = FALSE;
- int count;
+ char *arg, **argp;
char *smode;
- char **p;
- char *p0;
- char opt = '-';
-
- ++argv;
- count = 0;
-
- for (p = argv ; *p ; p++) {
- p0 = p[0];
- if (p0[0] == opt) {
- if ((p0[1] == '-') && !p0[2]) {
- opt = 0; /* Disable further option processing. */
- continue;
- }
- if (p0[1] == 'R') {
- char *s = p0 + 2;
- while (*s == 'R') {
- ++s;
- }
- if (*s) {
- bb_show_usage();
- }
- recursiveFlag = TRUE;
- continue;
- }
- if (count) {
- bb_show_usage();
- }
+
+ /* 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;
}
- argv[count] = p0;
- ++count;
}
- argv[count] = NULL;
+ /* Parse options */
+ getopt32(argv, "^" OPT_STR "\0" "-2");
+ argv += optind;
- if (count < 2) {
- bb_show_usage();
- }
-
- smode = *argv;
- ++argv;
+ /* Restore option-like mode if needed */
+ if (arg) arg[0] = '-';
/* Ok, ready to do the deed now */
+ smode = *argv++;
do {
- if (! recursive_action (*argv, recursiveFlag, TRUE, FALSE,
- fileAction, fileAction, smode)) {
+ if (!recursive_action(*argv,
+ OPT_RECURSE, // recurse
+ fileAction, // file action
+ fileAction, // dir action
+ smode, // user data
+ 0) // depth
+ ) {
retval = EXIT_FAILURE;
}
} while (*++argv);
}
/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
+Security: chmod is too important and too subtle.
+This is a test script (busybox chmod versus coreutils).
+Run it in empty directory.
+
+#!/bin/sh
+t1="/tmp/busybox chmod"
+t2="/usr/bin/chmod"
+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
+ )
+}
+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
+ rm out.diff
+}
+echo "If script produced 'out.diff' file, then at least one testcase failed"
+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"
*/
projects / oweals / busybox.git / blobdiff