| /* 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 "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) |
| { |
| 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_simple_perror_msg(fileName); |
| return FALSE; |
| } |
| |
| int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int chmod_main(int argc UNUSED_PARAM, 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(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 |
| 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" |
| */ |