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/* vi: set sw=4 ts=4: */
/*
* Mini chown implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config CHOWN
//config: bool "chown"
//config: default y
//config: help
//config: chown is used to change the user and/or group ownership
//config: of files.
//config:
//config:config FEATURE_CHOWN_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on CHOWN && LONG_OPTS
//config: help
//config: Enable use of long options
//applet:IF_CHOWN(APPLET_NOEXEC(chown, chown, BB_DIR_BIN, BB_SUID_DROP, chown))
//kbuild:lib-$(CONFIG_CHOWN) += chown.o
/* BB_AUDIT SUSv3 defects - none? */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
//usage:#define chown_trivial_usage
//usage: "[-Rh"IF_DESKTOP("LHPcvf")"]... USER[:[GRP]] FILE..."
//usage:#define chown_full_usage "\n\n"
//usage: "Change the owner and/or group of each FILE to USER and/or GRP\n"
//usage: "\n -R Recurse"
//usage: "\n -h Affect symlinks instead of symlink targets"
//usage: IF_DESKTOP(
//usage: "\n -L Traverse all symlinks to directories"
//usage: "\n -H Traverse symlinks on command line only"
//usage: "\n -P Don't traverse symlinks (default)"
//usage: "\n -c List changed files"
//usage: "\n -v List all files"
//usage: "\n -f Hide errors"
//usage: )
//usage:
//usage:#define chown_example_usage
//usage: "$ ls -l /tmp/foo\n"
//usage: "-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo\n"
//usage: "$ chown root /tmp/foo\n"
//usage: "$ ls -l /tmp/foo\n"
//usage: "-r--r--r-- 1 root andersen 0 Apr 12 18:25 /tmp/foo\n"
//usage: "$ chown root.root /tmp/foo\n"
//usage: "ls -l /tmp/foo\n"
//usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
#include "libbb.h"
/* This is a NOEXEC applet. Be very careful! */
#define OPT_STR ("Rh" IF_DESKTOP("vcfLHP"))
#define BIT_RECURSE 1
#define OPT_RECURSE (opt & 1)
#define OPT_NODEREF (opt & 2)
#define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
#define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
#define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0))
/* POSIX options
* -L traverse every symbolic link to a directory encountered
* -H if a command line argument is a symbolic link to a directory, traverse it
* -P do not traverse any symbolic links (default)
* We do not conform to the following:
* "Specifying more than one of -H, -L, and -P is not an error.
* The last option specified shall determine the behavior of the utility." */
/* -L */
#define BIT_TRAVERSE 0x20
#define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
/* -H or -L */
#define BIT_TRAVERSE_TOP (0x20|0x40)
#define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
static const char chown_longopts[] ALIGN1 =
"recursive\0" No_argument "R"
"dereference\0" No_argument "\xff"
"no-dereference\0" No_argument "h"
# if ENABLE_DESKTOP
"changes\0" No_argument "c"
"silent\0" No_argument "f"
"quiet\0" No_argument "f"
"verbose\0" No_argument "v"
# endif
;
#endif
typedef int (*chown_fptr)(const char *, uid_t, gid_t);
struct param_t {
struct bb_uidgid_t ugid;
chown_fptr chown_func;
};
static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf,
void *vparam, int depth UNUSED_PARAM)
{
#define param (*(struct param_t*)vparam)
#define opt option_mask32
uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
if (param.chown_func(fileName, u, g) == 0) {
if (OPT_VERBOSE
|| (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
) {
printf("changed ownership of '%s' to %u:%u\n",
fileName, (unsigned)u, (unsigned)g);
}
return TRUE;
}
if (!OPT_QUIET)
bb_simple_perror_msg(fileName);
return FALSE;
#undef opt
#undef param
}
int chown_main(int argc UNUSED_PARAM, char **argv)
{
int retval = EXIT_SUCCESS;
int opt, flags;
struct param_t param;
#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
applet_long_options = chown_longopts;
#endif
opt_complementary = "-2";
opt = getopt32(argv, OPT_STR);
argv += optind;
/* This matches coreutils behavior (almost - see below) */
param.chown_func = chown;
if (OPT_NODEREF
/* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
) {
param.chown_func = lchown;
}
flags = ACTION_DEPTHFIRST; /* match coreutils order */
if (OPT_RECURSE)
flags |= ACTION_RECURSE;
if (OPT_TRAVERSE_TOP)
flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
if (OPT_TRAVERSE)
flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
parse_chown_usergroup_or_die(¶m.ugid, argv[0]);
/* Ok, ready to do the deed now */
while (*++argv) {
if (!recursive_action(*argv,
flags, /* flags */
fileAction, /* file action */
fileAction, /* dir action */
¶m, /* user data */
0) /* depth */
) {
retval = EXIT_FAILURE;
}
}
return retval;
}
/*
Testcase. Run in empty directory.
#!/bin/sh
t1="/tmp/busybox chown"
t2="/usr/bin/chown"
create() {
rm -rf $1; mkdir $1
(
cd $1 || exit 1
mkdir dir dir2
>up
>file
>dir/file
>dir2/file
ln -s dir linkdir
ln -s file linkfile
ln -s ../up dir/linkup
ln -s ../dir2 dir/linkupdir2
)
chown -R 0:0 $1
}
tst() {
create test1
create test2
echo "[$1]" >>test1.out
echo "[$1]" >>test2.out
(cd test1; $t1 $1) >>test1.out 2>&1
(cd test2; $t2 $1) >>test2.out 2>&1
(cd test1; ls -lnR) >out1
(cd test2; ls -lnR) >out2
echo "chown $1" >out.diff
if ! diff -u out1 out2 >>out.diff; then exit 1; fi
rm out.diff
}
tst_for_each() {
tst "$1 1:1 file"
tst "$1 1:1 dir"
tst "$1 1:1 linkdir"
tst "$1 1:1 linkfile"
}
echo "If script produced 'out.diff' file, then at least one testcase failed"
>test1.out
>test2.out
# These match coreutils 6.8:
tst_for_each "-v"
tst_for_each "-vR"
tst_for_each "-vRP"
tst_for_each "-vRL"
tst_for_each "-vRH"
tst_for_each "-vh"
tst_for_each "-vhR"
tst_for_each "-vhRP"
tst_for_each "-vhRL"
tst_for_each "-vhRH"
# Fix `name' in coreutils output
sed 's/`/'"'"'/g' -i test2.out
# Compare us with coreutils output
diff -u test1.out test2.out
*/
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