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(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes text data bss dec hex filename 773469 1058 11092 785619 bfcd3 busybox_old 772644 1058 11092 784794 bf99a busybox_unstripped
161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini chmod implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
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* to correctly parse '-rwxgoa'
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 compliant */
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/* BB_AUDIT GNU defects - unsupported long options. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
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#include "libbb.h"
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/* This is a NOEXEC applet. Be very careful! */
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#define OPT_RECURSE (option_mask32 & 1)
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#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
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#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
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#define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
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#define OPT_STR "R" USE_DESKTOP("vcf")
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/* coreutils:
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* chmod never changes the permissions of symbolic links; the chmod
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* system call cannot change their permissions. This is not a problem
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* since the permissions of symbolic links are never used.
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* However, for each symbolic link listed on the command line, chmod changes
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* the permissions of the pointed-to file. In contrast, chmod ignores
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* symbolic links encountered during recursive directory traversals.
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*/
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static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
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{
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mode_t newmode;
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/* match coreutils behavior */
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if (depth == 0) {
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/* statbuf holds lstat result, but we need stat (follow link) */
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if (stat(fileName, statbuf))
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goto err;
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} else { /* depth > 0: skip links */
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if (S_ISLNK(statbuf->st_mode))
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return TRUE;
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}
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newmode = statbuf->st_mode;
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if (!bb_parse_mode((char *)param, &newmode))
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bb_error_msg_and_die("invalid mode: %s", (char *)param);
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if (chmod(fileName, newmode) == 0) {
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if (OPT_VERBOSE
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|| (OPT_CHANGED && statbuf->st_mode != newmode)
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) {
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printf("mode of '%s' changed to %04o (%s)\n", fileName,
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newmode & 07777, bb_mode_string(newmode)+1);
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}
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return TRUE;
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}
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err:
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if (!OPT_QUIET)
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bb_perror_msg("%s", fileName);
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return FALSE;
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}
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int chmod_main(int argc, char **argv);
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int chmod_main(int argc, char **argv)
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{
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int retval = EXIT_SUCCESS;
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char *arg, **argp;
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char *smode;
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/* Convert first encountered -r into ar, -w into aw etc
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* so that getopt would not eat it */
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argp = argv;
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while ((arg = *++argp)) {
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/* Mode spec must be the first arg (sans -R etc) */
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/* (protect against mishandling e.g. "chmod 644 -r") */
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if (arg[0] != '-') {
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arg = NULL;
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break;
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}
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/* An option. Not a -- or valid option? */
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if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
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arg[0] = 'a';
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break;
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}
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}
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/* Parse options */
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opt_complementary = "-2";
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getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
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argv += optind;
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/* Restore option-like mode if needed */
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if (arg) arg[0] = '-';
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/* Ok, ready to do the deed now */
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smode = *argv++;
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do {
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if (!recursive_action(*argv,
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OPT_RECURSE, // recurse
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fileAction, // file action
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fileAction, // dir action
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smode, // user data
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0) // depth
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) {
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retval = EXIT_FAILURE;
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}
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} while (*++argv);
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return retval;
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}
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/*
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Security: chmod is too important and too subtle.
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This is a test script (busybox chmod versus coreutils).
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Run it in empty directory.
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#!/bin/sh
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t1="/tmp/busybox chmod"
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t2="/usr/bin/chmod"
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create() {
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rm -rf $1; mkdir $1
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(
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cd $1 || exit 1
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mkdir dir
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>up
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>file
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>dir/file
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ln -s dir linkdir
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ln -s file linkfile
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ln -s ../up dir/up
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)
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}
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tst() {
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(cd test1; $t1 $1)
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(cd test2; $t2 $1)
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(cd test1; ls -lR) >out1
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(cd test2; ls -lR) >out2
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echo "chmod $1" >out.diff
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if ! diff -u out1 out2 >>out.diff; then exit 1; fi
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rm out.diff
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}
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echo "If script produced 'out.diff' file, then at least one testcase failed"
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create test1; create test2
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tst "a+w file"
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tst "a-w dir"
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tst "a+w linkfile"
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tst "a-w linkdir"
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tst "-R a+w file"
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tst "-R a-w dir"
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tst "-R a+w linkfile"
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tst "-R a-w linkdir"
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tst "a-r,a+x linkfile"
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*/
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