aboutsummaryrefslogtreecommitdiff
path: root/coreutils/chown.c
blob: c6c1260ad6a0ccc107b02acce64ce92307ff82cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/* 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

*/