235 lines
6.5 KiB
C
235 lines
6.5 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 source tree.
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*/
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//config:config CHOWN
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//config: bool "chown"
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//config: default y
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//config: help
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//config: chown is used to change the user and/or group ownership
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//config: of files.
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//config:
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//config:config FEATURE_CHOWN_LONG_OPTIONS
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//config: bool "Enable long options"
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//config: default y
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//config: depends on CHOWN && LONG_OPTS
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//config: help
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//config: Enable use of long options
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//applet:IF_CHOWN(APPLET_NOEXEC(chown, chown, BB_DIR_BIN, BB_SUID_DROP, chown))
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//kbuild:lib-$(CONFIG_CHOWN) += chown.o
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/* BB_AUDIT SUSv3 defects - none? */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
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//usage:#define chown_trivial_usage
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//usage: "[-Rh"IF_DESKTOP("LHPcvf")"]... USER[:[GRP]] FILE..."
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//usage:#define chown_full_usage "\n\n"
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//usage: "Change the owner and/or group of each FILE to USER and/or GRP\n"
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//usage: "\n -R Recurse"
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//usage: "\n -h Affect symlinks instead of symlink targets"
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//usage: IF_DESKTOP(
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//usage: "\n -L Traverse all symlinks to directories"
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//usage: "\n -H Traverse symlinks on command line only"
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//usage: "\n -P Don't traverse symlinks (default)"
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//usage: "\n -c List changed files"
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//usage: "\n -v List all files"
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//usage: "\n -f Hide errors"
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//usage: )
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//usage:
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//usage:#define chown_example_usage
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//usage: "$ ls -l /tmp/foo\n"
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//usage: "-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo\n"
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//usage: "$ chown root /tmp/foo\n"
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//usage: "$ ls -l /tmp/foo\n"
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//usage: "-r--r--r-- 1 root andersen 0 Apr 12 18:25 /tmp/foo\n"
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//usage: "$ chown root.root /tmp/foo\n"
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//usage: "ls -l /tmp/foo\n"
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//usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
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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" IF_DESKTOP("vcfLHP"))
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#define BIT_RECURSE 1
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#define OPT_RECURSE (opt & 1)
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#define OPT_NODEREF (opt & 2)
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#define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
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#define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
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#define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_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 (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_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 (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
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#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
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static const char chown_longopts[] ALIGN1 =
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"recursive\0" No_argument "R"
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"dereference\0" No_argument "\xff"
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"no-dereference\0" No_argument "h"
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# if ENABLE_DESKTOP
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"changes\0" No_argument "c"
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"silent\0" No_argument "f"
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"quiet\0" No_argument "f"
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"verbose\0" No_argument "v"
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# endif
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;
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#endif
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typedef int (*chown_fptr)(const char *, uid_t, gid_t);
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struct param_t {
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struct bb_uidgid_t ugid;
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chown_fptr chown_func;
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};
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static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf,
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void *vparam, int depth UNUSED_PARAM)
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{
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#define param (*(struct param_t*)vparam)
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#define opt option_mask32
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uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
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gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
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if (param.chown_func(fileName, u, g) == 0) {
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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_simple_perror_msg(fileName);
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return FALSE;
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#undef opt
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#undef param
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}
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int chown_main(int argc UNUSED_PARAM, char **argv)
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{
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int retval = EXIT_SUCCESS;
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int opt, flags;
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struct param_t param;
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#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
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applet_long_options = chown_longopts;
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#endif
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opt_complementary = "-2";
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opt = getopt32(argv, OPT_STR);
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argv += optind;
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/* This matches coreutils behavior (almost - see below) */
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param.chown_func = chown;
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if (OPT_NODEREF
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/* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
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IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
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) {
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param.chown_func = lchown;
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}
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flags = ACTION_DEPTHFIRST; /* match coreutils order */
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if (OPT_RECURSE)
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flags |= ACTION_RECURSE;
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if (OPT_TRAVERSE_TOP)
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flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
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if (OPT_TRAVERSE)
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flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
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parse_chown_usergroup_or_die(¶m.ugid, argv[0]);
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/* Ok, ready to do the deed now */
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while (*++argv) {
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if (!recursive_action(*argv,
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flags, /* flags */
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fileAction, /* file action */
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fileAction, /* dir action */
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¶m, /* 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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}
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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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echo "[$1]" >>test1.out
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echo "[$1]" >>test2.out
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(cd test1; $t1 $1) >>test1.out 2>&1
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(cd test2; $t2 $1) >>test2.out 2>&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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>test1.out
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>test2.out
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# These match coreutils 6.8:
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tst_for_each "-v"
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tst_for_each "-vR"
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tst_for_each "-vRP"
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tst_for_each "-vRL"
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tst_for_each "-vRH"
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tst_for_each "-vh"
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tst_for_each "-vhR"
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tst_for_each "-vhRP"
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tst_for_each "-vhRL"
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tst_for_each "-vhRH"
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# Fix `name' in coreutils output
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sed 's/`/'"'"'/g' -i test2.out
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# Compare us with coreutils output
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diff -u test1.out test2.out
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*/
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