170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini chown 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 defects - none? */
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/* BB_AUDIT GNU defects - unsupported long options. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.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_STR ("Rh" USE_DESKTOP("vcfLHP"))
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#define BIT_RECURSE 1
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#define OPT_RECURSE (option_mask32 & 1)
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#define OPT_NODEREF (option_mask32 & 2)
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#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 0x04) SKIP_DESKTOP(0))
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#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 0x08) SKIP_DESKTOP(0))
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#define OPT_QUIET (USE_DESKTOP(option_mask32 & 0x10) SKIP_DESKTOP(0))
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/* POSIX options
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* -L traverse every symbolic link to a directory encountered
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* -H if a command line argument is a symbolic link to a directory, traverse it
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* -P do not traverse any symbolic links (default)
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* We do not conform to the following:
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* "Specifying more than one of -H, -L, and -P is not an error.
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* The last option specified shall determine the behavior of the utility." */
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/* -L */
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#define BIT_TRAVERSE 0x20
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#define OPT_TRAVERSE (USE_DESKTOP(option_mask32 & BIT_TRAVERSE) SKIP_DESKTOP(0))
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/* -H or -L */
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#define BIT_TRAVERSE_TOP (0x20|0x40)
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#define OPT_TRAVERSE_TOP (USE_DESKTOP(option_mask32 & BIT_TRAVERSE_TOP) SKIP_DESKTOP(0))
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typedef int (*chown_fptr)(const char *, uid_t, gid_t);
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static struct bb_uidgid_t ugid = { -1, -1 };
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static int fileAction(const char *fileName, struct stat *statbuf,
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void *cf, int depth)
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{
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uid_t u = (ugid.uid == (uid_t)-1) ? statbuf->st_uid : ugid.uid;
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gid_t g = (ugid.gid == (gid_t)-1) ? statbuf->st_gid : ugid.gid;
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if (!((chown_fptr)cf)(fileName, u, g)) {
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if (OPT_VERBOSE
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|| (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
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) {
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printf("changed ownership of '%s' to %u:%u\n",
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fileName, (unsigned)u, (unsigned)g);
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}
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return TRUE;
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}
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if (!OPT_QUIET)
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bb_perror_msg("%s", fileName); /* A filename can have % in it... */
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return FALSE;
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}
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int chown_main(int argc, char **argv);
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int chown_main(int argc, char **argv)
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{
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int retval = EXIT_SUCCESS;
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chown_fptr chown_func;
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opt_complementary = "-2";
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getopt32(argc, argv, OPT_STR);
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argv += optind;
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/* This matches coreutils behavior (almost - see below) */
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chown_func = chown;
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if (OPT_NODEREF
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/* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
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USE_DESKTOP( || (option_mask32 & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
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) {
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chown_func = lchown;
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}
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parse_chown_usergroup_or_die(&ugid, argv[0]);
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/* Ok, ready to do the deed now */
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argv++;
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do {
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char *arg = *argv;
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if (OPT_TRAVERSE_TOP) {
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/* resolves symlink (even recursive) */
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arg = xmalloc_realpath(arg);
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if (!arg)
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continue;
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}
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if (!recursive_action(arg,
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(OPT_RECURSE ? ACTION_RECURSE : 0) | /* recurse */
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(OPT_TRAVERSE ? ACTION_FOLLOWLINKS : 0),/* follow links if -L */
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fileAction, /* file action */
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fileAction, /* dir action */
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chown_func, /* 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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if (OPT_TRAVERSE_TOP)
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free(arg);
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} while (*++argv);
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return retval;
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}
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/*
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Testcase. Run in empty directory.
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#!/bin/sh
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t1="/tmp/busybox chown"
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t2="/usr/bin/chown"
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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 dir2
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>up
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>file
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>dir/file
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>dir2/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/linkup
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ln -s ../dir2 dir/linkupdir2
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)
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chown -R 0:0 $1
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}
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tst() {
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create test1
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create test2
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(cd test1; $t1 $1)
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(cd test2; $t2 $1)
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(cd test1; ls -lnR) >out1
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(cd test2; ls -lnR) >out2
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echo "chown $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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tst_for_each() {
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tst "$1 1:1 file"
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tst "$1 1:1 dir"
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tst "$1 1:1 linkdir"
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tst "$1 1:1 linkfile"
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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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# These match coreutils 6.8:
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tst_for_each ""
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tst_for_each "-R"
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tst_for_each "-RP"
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tst_for_each "-RL"
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tst_for_each "-RH"
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tst_for_each "-h"
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tst_for_each "-hR"
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tst_for_each "-hRP"
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# Below: with "chown linkdir" coreutils 6.8 will chown linkdir _target_,
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# we lchown _the link_. I believe we are "more correct".
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#tst_for_each "-hRL"
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#tst_for_each "-hRH"
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*/
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