busybox/coreutils/chown.c

/* 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 tarball for details.
 */

/* BB_AUDIT SUSv3 defects - none? */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */

#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)-1) ? statbuf->st_uid : param.ugid.uid;
	gid_t g = (param.ugid.gid == (gid_t)-1) ? 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);	/* A filename can have % in it... */
	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;

	param.ugid.uid = -1;
	param.ugid.gid = -1;

#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(&param.ugid, argv[0]);

	/* Ok, ready to do the deed now */
	while (*++argv) {
		if (!recursive_action(*argv,
				flags,          /* flags */
				fileAction,     /* file action */
				fileAction,     /* dir action */
				&param,         /* 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

*/
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 tarball for details.
8	*/
9
10	/* BB_AUDIT SUSv3 defects - none? */
11	/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
12
13	#include "libbb.h"
14
15	/* This is a NOEXEC applet. Be very careful! */
16
17
18	#define OPT_STR ("Rh" IF_DESKTOP("vcfLHP"))
19	#define BIT_RECURSE 1
20	#define OPT_RECURSE (opt & 1)
21	#define OPT_NODEREF (opt & 2)
22	#define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
23	#define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
24	#define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0))
25	/* POSIX options
26	* -L traverse every symbolic link to a directory encountered
27	* -H if a command line argument is a symbolic link to a directory, traverse it
28	* -P do not traverse any symbolic links (default)
29	* We do not conform to the following:
30	* "Specifying more than one of -H, -L, and -P is not an error.
31	* The last option specified shall determine the behavior of the utility." */
32	/* -L */
33	#define BIT_TRAVERSE 0x20
34	#define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
35	/* -H or -L */
36	#define BIT_TRAVERSE_TOP (0x20\|0x40)
37	#define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
38
39	#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
40	static const char chown_longopts[] ALIGN1 =
41	"recursive\0" No_argument "R"
42	"dereference\0" No_argument "\xff"
43	"no-dereference\0" No_argument "h"
44	# if ENABLE_DESKTOP
45	"changes\0" No_argument "c"
46	"silent\0" No_argument "f"
47	"quiet\0" No_argument "f"
48	"verbose\0" No_argument "v"
49	# endif
50	;
51	#endif
52
53	typedef int (chown_fptr)(const char , uid_t, gid_t);
54
55	struct param_t {
56	struct bb_uidgid_t ugid;
57	chown_fptr chown_func;
58	};
59
60	static int FAST_FUNC fileAction(const char fileName, struct stat statbuf,
61	void *vparam, int depth UNUSED_PARAM)
62	{
63	#define param ((struct param_t)vparam)
64	#define opt option_mask32
65	uid_t u = (param.ugid.uid == (uid_t)-1) ? statbuf->st_uid : param.ugid.uid;
66	gid_t g = (param.ugid.gid == (gid_t)-1) ? statbuf->st_gid : param.ugid.gid;
67
68	if (param.chown_func(fileName, u, g) == 0) {
69	if (OPT_VERBOSE
70	\|\| (OPT_CHANGED && (statbuf->st_uid != u \|\| statbuf->st_gid != g))
71	) {
72	printf("changed ownership of '%s' to %u:%u\n",
73	fileName, (unsigned)u, (unsigned)g);
74	}
75	return TRUE;
76	}
77	if (!OPT_QUIET)
78	bb_simple_perror_msg(fileName); /* A filename can have % in it... */
79	return FALSE;
80	#undef opt
81	#undef param
82	}
83
84	int chown_main(int argc UNUSED_PARAM, char **argv)
85	{
86	int retval = EXIT_SUCCESS;
87	int opt, flags;
88	struct param_t param;
89
90	param.ugid.uid = -1;
91	param.ugid.gid = -1;
92
93	#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
94	applet_long_options = chown_longopts;
95	#endif
96	opt_complementary = "-2";
97	opt = getopt32(argv, OPT_STR);
98	argv += optind;
99
100	/* This matches coreutils behavior (almost - see below) */
101	param.chown_func = chown;
102	if (OPT_NODEREF
103	/* \|\| (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
104	IF_DESKTOP( \|\| (opt & (BIT_RECURSE\|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
105	) {
106	param.chown_func = lchown;
107	}
108
109	flags = ACTION_DEPTHFIRST; /* match coreutils order */
110	if (OPT_RECURSE)
111	flags \|= ACTION_RECURSE;
112	if (OPT_TRAVERSE_TOP)
113	flags \|= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
114	if (OPT_TRAVERSE)
115	flags \|= ACTION_FOLLOWLINKS; /* follow links if -L */
116
117	parse_chown_usergroup_or_die(&param.ugid, argv[0]);
118
119	/* Ok, ready to do the deed now */
120	while (*++argv) {
121	if (!recursive_action(*argv,
122	flags, /* flags */
123	fileAction, /* file action */
124	fileAction, /* dir action */
125	&param, /* user data */
126	0) /* depth */
127	) {
128	retval = EXIT_FAILURE;
129	}
130	}
131
132	return retval;
133	}
134
135	/*
136	Testcase. Run in empty directory.
137
138	#!/bin/sh
139	t1="/tmp/busybox chown"
140	t2="/usr/bin/chown"
141	create() {
142	rm -rf $1; mkdir $1
143	(
144	cd $1 \|\| exit 1
145	mkdir dir dir2
146	>up
147	>file
148	>dir/file
149	>dir2/file
150	ln -s dir linkdir
151	ln -s file linkfile
152	ln -s ../up dir/linkup
153	ln -s ../dir2 dir/linkupdir2
154	)
155	chown -R 0:0 $1
156	}
157	tst() {
158	create test1
159	create test2
160	echo "[$1]" >>test1.out
161	echo "[$1]" >>test2.out
162	(cd test1; $t1 $1) >>test1.out 2>&1
163	(cd test2; $t2 $1) >>test2.out 2>&1
164	(cd test1; ls -lnR) >out1
165	(cd test2; ls -lnR) >out2
166	echo "chown $1" >out.diff
167	if ! diff -u out1 out2 >>out.diff; then exit 1; fi
168	rm out.diff
169	}
170	tst_for_each() {
171	tst "$1 1:1 file"
172	tst "$1 1:1 dir"
173	tst "$1 1:1 linkdir"
174	tst "$1 1:1 linkfile"
175	}
176	echo "If script produced 'out.diff' file, then at least one testcase failed"
177	>test1.out
178	>test2.out
179	# These match coreutils 6.8:
180	tst_for_each "-v"
181	tst_for_each "-vR"
182	tst_for_each "-vRP"
183	tst_for_each "-vRL"
184	tst_for_each "-vRH"
185	tst_for_each "-vh"
186	tst_for_each "-vhR"
187	tst_for_each "-vhRP"
188	tst_for_each "-vhRL"
189	tst_for_each "-vhRH"
190	# Fix `name' in coreutils output
191	sed 's/`/'"'"'/g' -i test2.out
192	# Compare us with coreutils output
193	diff -u test1.out test2.out
194
195	*/