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)-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;

	/* Just -1 might not work: uid_t may be unsigned long */
	param.ugid.uid = -1L;
	param.ugid.gid = -1L;

#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	niro	532	/* 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	niro	816	/* BB_AUDIT SUSv3 defects - none? */
11	niro	532	/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
12
13	niro	816	#include "libbb.h"
14	niro	532
15	niro	816	/* This is a NOEXEC applet. Be very careful! */
16	niro	532
17
18	niro	984	#define OPT_STR ("Rh" IF_DESKTOP("vcfLHP"))
19	niro	816	#define BIT_RECURSE 1
20			#define OPT_RECURSE (opt & 1)
21			#define OPT_NODEREF (opt & 2)
22	niro	984	#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	niro	816	/* POSIX options
26			* -L traverse every symbolic link to a directory encountered
27	niro	532	* -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	niro	816	* 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	niro	984	#define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
35	niro	816	/* -H or -L */
36			#define BIT_TRAVERSE_TOP (0x20\|0x40)
37	niro	984	#define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
38	niro	532
39	niro	984	#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	niro	816	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	niro	532	{
63	niro	816	#define param ((struct param_t)vparam)
64			#define opt option_mask32
65	niro	1123	uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
66			gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
67	niro	532
68	niro	816	if (param.chown_func(fileName, u, g) == 0) {
69	niro	532	if (OPT_VERBOSE
70	niro	816	\|\| (OPT_CHANGED && (statbuf->st_uid != u \|\| statbuf->st_gid != g))
71	niro	532	) {
72			printf("changed ownership of '%s' to %u:%u\n",
73	niro	816	fileName, (unsigned)u, (unsigned)g);
74	niro	532	}
75			return TRUE;
76			}
77			if (!OPT_QUIET)
78	niro	1123	bb_simple_perror_msg(fileName);
79	niro	532	return FALSE;
80	niro	816	#undef opt
81			#undef param
82	niro	532	}
83
84	niro	816	int chown_main(int argc UNUSED_PARAM, char **argv)
85	niro	532	{
86			int retval = EXIT_SUCCESS;
87	niro	816	int opt, flags;
88			struct param_t param;
89	niro	532
90	niro	1123	/* Just -1 might not work: uid_t may be unsigned long */
91			param.ugid.uid = -1L;
92			param.ugid.gid = -1L;
93	niro	816
94	niro	984	#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
95			applet_long_options = chown_longopts;
96			#endif
97	niro	532	opt_complementary = "-2";
98	niro	816	opt = getopt32(argv, OPT_STR);
99	niro	532	argv += optind;
100
101	niro	816	/* This matches coreutils behavior (almost - see below) */
102	niro	984	param.chown_func = chown;
103	niro	816	if (OPT_NODEREF
104			/* \|\| (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
105	niro	984	IF_DESKTOP( \|\| (opt & (BIT_RECURSE\|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
106	niro	816	) {
107			param.chown_func = lchown;
108			}
109	niro	532
110	niro	816	flags = ACTION_DEPTHFIRST; /* match coreutils order */
111			if (OPT_RECURSE)
112			flags \|= ACTION_RECURSE;
113			if (OPT_TRAVERSE_TOP)
114			flags \|= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
115			if (OPT_TRAVERSE)
116			flags \|= ACTION_FOLLOWLINKS; /* follow links if -L */
117	niro	532
118	niro	816	parse_chown_usergroup_or_die(&param.ugid, argv[0]);
119	niro	532
120			/* Ok, ready to do the deed now */
121	niro	984	while (*++argv) {
122	niro	532	if (!recursive_action(*argv,
123	niro	816	flags, /* flags */
124			fileAction, /* file action */
125			fileAction, /* dir action */
126			&param, /* user data */
127			0) /* depth */
128	niro	532	) {
129			retval = EXIT_FAILURE;
130			}
131	niro	984	}
132	niro	532
133			return retval;
134			}
135	niro	816
136			/*
137			Testcase. Run in empty directory.
138
139			#!/bin/sh
140			t1="/tmp/busybox chown"
141			t2="/usr/bin/chown"
142			create() {
143			rm -rf $1; mkdir $1
144			(
145			cd $1 \|\| exit 1
146			mkdir dir dir2
147			>up
148			>file
149			>dir/file
150			>dir2/file
151			ln -s dir linkdir
152			ln -s file linkfile
153			ln -s ../up dir/linkup
154			ln -s ../dir2 dir/linkupdir2
155			)
156			chown -R 0:0 $1
157			}
158			tst() {
159			create test1
160			create test2
161			echo "[$1]" >>test1.out
162			echo "[$1]" >>test2.out
163			(cd test1; $t1 $1) >>test1.out 2>&1
164			(cd test2; $t2 $1) >>test2.out 2>&1
165			(cd test1; ls -lnR) >out1
166			(cd test2; ls -lnR) >out2
167			echo "chown $1" >out.diff
168			if ! diff -u out1 out2 >>out.diff; then exit 1; fi
169			rm out.diff
170			}
171			tst_for_each() {
172			tst "$1 1:1 file"
173			tst "$1 1:1 dir"
174			tst "$1 1:1 linkdir"
175			tst "$1 1:1 linkfile"
176			}
177			echo "If script produced 'out.diff' file, then at least one testcase failed"
178			>test1.out
179			>test2.out
180			# These match coreutils 6.8:
181			tst_for_each "-v"
182			tst_for_each "-vR"
183			tst_for_each "-vRP"
184			tst_for_each "-vRL"
185			tst_for_each "-vRH"
186			tst_for_each "-vh"
187			tst_for_each "-vhR"
188			tst_for_each "-vhRP"
189			tst_for_each "-vhRL"
190			tst_for_each "-vhRH"
191			# Fix `name' in coreutils output
192			sed 's/`/'"'"'/g' -i test2.out
193			# Compare us with coreutils output
194			diff -u test1.out test2.out
195
196			*/