path: root/coreutils/chown.c (plain)
blob: 50b06d73a1ce69fa6d37ff767d2edc1dd48d75f4

1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini chown implementation for busybox
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
8	*/
9	//config:config CHOWN
10	//config: bool "chown"
11	//config: default y
12	//config: help
13	//config: chown is used to change the user and/or group ownership
14	//config: of files.
15	//config:
16	//config:config FEATURE_CHOWN_LONG_OPTIONS
17	//config: bool "Enable long options"
18	//config: default y
19	//config: depends on CHOWN && LONG_OPTS
20	//config: help
21	//config: Enable use of long options
22
23	//applet:IF_CHOWN(APPLET_NOEXEC(chown, chown, BB_DIR_BIN, BB_SUID_DROP, chown))
24
25	//kbuild:lib-$(CONFIG_CHOWN) += chown.o
26
27	/* BB_AUDIT SUSv3 defects - none? */
28	/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
29
30	//usage:#define chown_trivial_usage
31	//usage: "[-Rh"IF_DESKTOP("LHPcvf")"]... USER[:[GRP]] FILE..."
32	//usage:#define chown_full_usage "\n\n"
33	//usage: "Change the owner and/or group of each FILE to USER and/or GRP\n"
34	//usage: "\n -R Recurse"
35	//usage: "\n -h Affect symlinks instead of symlink targets"
36	//usage: IF_DESKTOP(
37	//usage: "\n -L Traverse all symlinks to directories"
38	//usage: "\n -H Traverse symlinks on command line only"
39	//usage: "\n -P Don't traverse symlinks (default)"
40	//usage: "\n -c List changed files"
41	//usage: "\n -v List all files"
42	//usage: "\n -f Hide errors"
43	//usage: )
44	//usage:
45	//usage:#define chown_example_usage
46	//usage: "$ ls -l /tmp/foo\n"
47	//usage: "-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo\n"
48	//usage: "$ chown root /tmp/foo\n"
49	//usage: "$ ls -l /tmp/foo\n"
50	//usage: "-r--r--r-- 1 root andersen 0 Apr 12 18:25 /tmp/foo\n"
51	//usage: "$ chown root.root /tmp/foo\n"
52	//usage: "ls -l /tmp/foo\n"
53	//usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
54
55	#include "libbb.h"
56
57	/* This is a NOEXEC applet. Be very careful! */
58
59
60	#define OPT_STR ("Rh" IF_DESKTOP("vcfLHP"))
61	#define BIT_RECURSE 1
62	#define OPT_RECURSE (opt & 1)
63	#define OPT_NODEREF (opt & 2)
64	#define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
65	#define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
66	#define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0))
67	/* POSIX options
68	* -L traverse every symbolic link to a directory encountered
69	* -H if a command line argument is a symbolic link to a directory, traverse it
70	* -P do not traverse any symbolic links (default)
71	* We do not conform to the following:
72	* "Specifying more than one of -H, -L, and -P is not an error.
73	* The last option specified shall determine the behavior of the utility." */
74	/* -L */
75	#define BIT_TRAVERSE 0x20
76	#define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
77	/* -H or -L */
78	#define BIT_TRAVERSE_TOP (0x20|0x40)
79	#define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
80
81	#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
82	static const char chown_longopts[] ALIGN1 =
83	"recursive\0" No_argument "R"
84	"dereference\0" No_argument "\xff"
85	"no-dereference\0" No_argument "h"
86	# if ENABLE_DESKTOP
87	"changes\0" No_argument "c"
88	"silent\0" No_argument "f"
89	"quiet\0" No_argument "f"
90	"verbose\0" No_argument "v"
91	# endif
92	;
93	#endif
94
95	typedef int (*chown_fptr)(const char *, uid_t, gid_t);
96
97	struct param_t {
98	struct bb_uidgid_t ugid;
99	chown_fptr chown_func;
100	};
101
102	static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf,
103	void *vparam, int depth UNUSED_PARAM)
104	{
105	#define param (*(struct param_t*)vparam)
106	#define opt option_mask32
107	uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
108	gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
109
110	if (param.chown_func(fileName, u, g) == 0) {
111	if (OPT_VERBOSE
112	|| (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
113	) {
114	printf("changed ownership of '%s' to %u:%u\n",
115	fileName, (unsigned)u, (unsigned)g);
116	}
117	return TRUE;
118	}
119	if (!OPT_QUIET)
120	bb_simple_perror_msg(fileName);
121	return FALSE;
122	#undef opt
123	#undef param
124	}
125
126	int chown_main(int argc UNUSED_PARAM, char **argv)
127	{
128	int retval = EXIT_SUCCESS;
129	int opt, flags;
130	struct param_t param;
131
132	#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
133	applet_long_options = chown_longopts;
134	#endif
135	opt_complementary = "-2";
136	opt = getopt32(argv, OPT_STR);
137	argv += optind;
138
139	/* This matches coreutils behavior (almost - see below) */
140	param.chown_func = chown;
141	if (OPT_NODEREF
142	/* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
143	IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
144	) {
145	param.chown_func = lchown;
146	}
147
148	flags = ACTION_DEPTHFIRST; /* match coreutils order */
149	if (OPT_RECURSE)
150	flags |= ACTION_RECURSE;
151	if (OPT_TRAVERSE_TOP)
152	flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
153	if (OPT_TRAVERSE)
154	flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
155
156	parse_chown_usergroup_or_die(&param.ugid, argv[0]);
157
158	/* Ok, ready to do the deed now */
159	while (*++argv) {
160	if (!recursive_action(*argv,
161	flags, /* flags */
162	fileAction, /* file action */
163	fileAction, /* dir action */
164	&param, /* user data */
165	0) /* depth */
166	) {
167	retval = EXIT_FAILURE;
168	}
169	}
170
171	return retval;
172	}
173
174	/*
175	Testcase. Run in empty directory.
176
177	#!/bin/sh
178	t1="/tmp/busybox chown"
179	t2="/usr/bin/chown"
180	create() {
181	rm -rf $1; mkdir $1
182	(
183	cd $1 || exit 1
184	mkdir dir dir2
185	>up
186	>file
187	>dir/file
188	>dir2/file
189	ln -s dir linkdir
190	ln -s file linkfile
191	ln -s ../up dir/linkup
192	ln -s ../dir2 dir/linkupdir2
193	)
194	chown -R 0:0 $1
195	}
196	tst() {
197	create test1
198	create test2
199	echo "[$1]" >>test1.out
200	echo "[$1]" >>test2.out
201	(cd test1; $t1 $1) >>test1.out 2>&1
202	(cd test2; $t2 $1) >>test2.out 2>&1
203	(cd test1; ls -lnR) >out1
204	(cd test2; ls -lnR) >out2
205	echo "chown $1" >out.diff
206	if ! diff -u out1 out2 >>out.diff; then exit 1; fi
207	rm out.diff
208	}
209	tst_for_each() {
210	tst "$1 1:1 file"
211	tst "$1 1:1 dir"
212	tst "$1 1:1 linkdir"
213	tst "$1 1:1 linkfile"
214	}
215	echo "If script produced 'out.diff' file, then at least one testcase failed"
216	>test1.out
217	>test2.out
218	# These match coreutils 6.8:
219	tst_for_each "-v"
220	tst_for_each "-vR"
221	tst_for_each "-vRP"
222	tst_for_each "-vRL"
223	tst_for_each "-vRH"
224	tst_for_each "-vh"
225	tst_for_each "-vhR"
226	tst_for_each "-vhRP"
227	tst_for_each "-vhRL"
228	tst_for_each "-vhRH"
229	# Fix `name' in coreutils output
230	sed 's/`/'"'"'/g' -i test2.out
231	# Compare us with coreutils output
232	diff -u test1.out test2.out
233
234	*/
235