104 lines
3.0 KiB
C
104 lines
3.0 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 "busybox.h"
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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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/* TODO:
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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* junk)
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{
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mode_t newmode = statbuf->st_mode;
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// TODO: match GNU behavior:
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// if (depth > 0 && S_ISLNK(statbuf->st_mode)) return TRUE;
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// if (depth == 0) follow link
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if (!bb_parse_mode((char *)junk, &newmode))
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bb_error_msg_and_die("invalid mode: %s", (char *)junk);
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if (chmod(fileName, statbuf->st_mode) == 0) {
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if (OPT_VERBOSE /* -v verbose? or -c changed? */
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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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if (!OPT_QUIET) /* not silent (-f)? */
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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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{
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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 a-r, -w into a-w etc */
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argp = argv + 1;
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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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break;
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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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argp[0] = xasprintf("a%s", arg);
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break;
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}
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argp++;
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}
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/* "chmod -rzzz abc" will say "invalid mode: a-rzzz"!
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* It is easily fixable, but deemed not worth the code */
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opt_complementary = "-2";
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getopt32(argc, argv, OPT_STR + 1); /* Reuse string */
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argv += optind;
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smode = *argv++;
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/* Ok, ready to do the deed now */
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do {
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if (!recursive_action(*argv,
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OPT_RECURSE, // recurse
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FALSE, // follow links: GNU doesn't
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FALSE, // depth first
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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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) {
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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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