-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include "internal.h"
-
-const char chmod_usage[] = "chmod [-R] mode file [file ...]\n"
-"\nmode may be an octal integer representing the bit pattern for the\n"
-"\tnew mode, or a symbolic value matching the pattern\n"
-"\t[ugoa]{+|-|=}[rwxst] .\n"
-"\t\tu:\tUser\n"
-"\t\tg:\tGroup\n"
-"\t\to:\tOthers\n"
-"\t\ta:\tAll\n"
-"\n"
-"\n+:\tAdd privilege\n"
-"\n-:\tRemove privilege\n"
-"\n=:\tSet privilege\n"
-"\n"
-"\t\tr:\tRead\n"
-"\t\tw:\tWrite\n"
-"\t\tx:\tExecute\n"
-"\t\ts:\tSet User ID\n"
-"\t\tt:\t\"Sticky\" Text\n"
-"\n"
-"\tModes may be concatenated, as in \"u=rwx,g=rx,o=rx,-t,-s\n"
-"\n"
-"\t-R:\tRecursively change the mode of all files and directories\n"
-"\t\tunder the argument directory.";
-
-int
-parse_mode(
- const char * s
-,mode_t * or
-,mode_t * and
-,int * group_execute)
+/* 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 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-$(CONFIG_CHMOD) += chmod.o
+
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU defects - unsupported long options. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
+
+//usage:#define chmod_trivial_usage
+//usage: "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."
+//usage:#define chmod_full_usage "\n\n"
+//usage: "Each MODE is one or more of the letters ugoa, one of the\n"
+//usage: "symbols +-= and one or more of the letters rwxst\n"
+//usage: "\n -R Recurse"
+//usage: IF_DESKTOP(
+//usage: "\n -c List changed files"
+//usage: "\n -v List all files"
+//usage: "\n -f Hide errors"
+//usage: )
+//usage:
+//usage:#define chmod_example_usage
+//usage: "$ 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")
+
+/* 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)
{
- /* [ugoa]{+|-|=}[rwxstl] */
- mode_t mode = 0;
- mode_t groups = S_ISVTX;
- char type;
- char c;
+ mode_t newmode;
- do {
- for ( ; ; ) {
- switch ( c = *s++ ) {
- case '\0':
- return -1;
- case 'u':
- groups |= S_ISUID|S_IRWXU;
- continue;
- case 'g':
- groups |= S_ISGID|S_IRWXG;
- continue;
- case 'o':
- groups |= S_IRWXO;
- continue;
- case 'a':
- groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
- continue;
- case '+':
- case '=':
- case '-':
- type = c;
- if ( groups == S_ISVTX ) /* The default is "all" */
- groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
- break;
- default:
- if ( c >= '0' && c <= '7' && mode == 0 && groups == S_ISVTX ) {
- *and = 0;
- *or = strtol(--s, 0, 010);
- return 0;
- }
- else
- return -1;
- }
- break;
- }
+ /* 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;
+ }
- while ( (c = *s++) != '\0' ) {
- switch ( c ) {
- case ',':
- break;
- case 'r':
- mode |= S_IRUSR|S_IRGRP|S_IROTH;
- continue;
- case 'w':
- mode |= S_IWUSR|S_IWGRP|S_IWOTH;
- continue;
- case 'x':
- mode |= S_IXUSR|S_IXGRP|S_IXOTH;
- continue;
- case 's':
- if ( group_execute != 0 && (groups & S_IRWXG) ) {
- if ( *group_execute < 0 )
- return -1;
- if ( type != '-' ) {
- mode |= S_IXGRP;
- *group_execute = 1;
- }
- }
- mode |= S_ISUID|S_ISGID;
- continue;
- case 'l':
- if ( *group_execute > 0 )
- return -1;
- if ( type != '-' ) {
- *and &= ~S_IXGRP;
- *group_execute = -1;
- }
- mode |= S_ISGID;
- groups |= S_ISGID;
- continue;
- case 't':
- mode |= S_ISVTX;
- continue;
- default:
- return -1;
- }
- break;
- }
- switch ( type ) {
- case '=':
- *and &= ~(groups);
- /* fall through */
- case '+':
- *or |= mode & groups;
- break;
- case '-':
- *and &= ~(mode & groups);
- *or &= *and;
- break;
+ 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);
}
- } while ( c == ',' );
- return 0;
+ return TRUE;
+ }
+ err:
+ if (!OPT_QUIET)
+ bb_simple_perror_msg(fileName);
+ return FALSE;
}
-extern int
-chmod_main(struct FileInfo * i, int argc, char * * argv)
+int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int chmod_main(int argc UNUSED_PARAM, char **argv)
{
- i->andWithMode = S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
- i->orWithMode = 0;
-
- while ( argc >= 3 ) {
- if ( parse_mode(argv[1], &i->orWithMode, &i->andWithMode, 0)
- == 0 ) {
- argc--;
- argv++;
- }
- else if ( strcmp(argv[1], "-R") == 0 ) {
- i->recursive = 1;
- argc--;
- 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;
}
- else
+ /* An option. Not a -- or valid option? */
+ if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
+ arg[0] = 'a';
break;
+ }
}
- i->changeMode = 1;
- i->complainInPostProcess = 1;
+ /* Parse options */
+ getopt32(argv, "^" OPT_STR "\0" "-2");
+ argv += optind;
- return monadic_main(i, argc, 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,
+ OPT_RECURSE, // recurse
+ 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 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