1 /* $NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993, 1994, 2003
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994, 2003\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94";
41 #else
42 __RCSID("$NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $");
43 #endif
44 #endif /* not lint */
45
46 #include <sys/types.h>
47 #include <sys/stat.h>
48
49 #include <ctype.h>
50 #include <dirent.h>
51 #include <err.h>
52 #include <errno.h>
53 #include <locale.h>
54 #include <fts.h>
55 #include <grp.h>
56 #include <pwd.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <unistd.h>
61 #include <getopt.h>
62
63 static void a_gid(const char *);
64 static void a_uid(const char *);
65 static id_t id(const char *, const char *);
66 __dead static void usage(void);
67
68 static uid_t uid;
69 static gid_t gid;
70 static int ischown;
71 static const char *myname;
72
73 struct option chown_longopts[] = {
74 { "reference", required_argument, 0,
75 1 },
76 { NULL, 0, 0,
77 0 },
78 };
79
80 int
main(int argc,char ** argv)81 main(int argc, char **argv)
82 {
83 FTS *ftsp;
84 FTSENT *p;
85 int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, vflag;
86 char *cp, *reference;
87 int (*change_owner)(const char *, uid_t, gid_t);
88
89 setprogname(*argv);
90
91 (void)setlocale(LC_ALL, "");
92
93 myname = getprogname();
94 ischown = (myname[2] == 'o');
95 reference = NULL;
96
97 Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
98 while ((ch = getopt_long(argc, argv, "HLPRfhv",
99 chown_longopts, NULL)) != -1)
100 switch (ch) {
101 case 1:
102 reference = optarg;
103 break;
104 case 'H':
105 Hflag = 1;
106 Lflag = 0;
107 break;
108 case 'L':
109 Lflag = 1;
110 Hflag = 0;
111 break;
112 case 'P':
113 Hflag = Lflag = 0;
114 break;
115 case 'R':
116 Rflag = 1;
117 break;
118 case 'f':
119 fflag = 1;
120 break;
121 case 'h':
122 /*
123 * In System V the -h option causes chown/chgrp to
124 * change the owner/group of the symbolic link.
125 * 4.4BSD's symbolic links didn't have owners/groups,
126 * so it was an undocumented noop.
127 * In NetBSD 1.3, lchown(2) is introduced.
128 */
129 hflag = 1;
130 break;
131 case 'v':
132 vflag = 1;
133 break;
134 case '?':
135 default:
136 usage();
137 }
138 argv += optind;
139 argc -= optind;
140
141 if (argc == 0 || (argc == 1 && reference == NULL))
142 usage();
143
144 fts_options = FTS_PHYSICAL;
145 if (Rflag) {
146 if (Hflag)
147 fts_options |= FTS_COMFOLLOW;
148 if (Lflag) {
149 if (hflag)
150 errx(EXIT_FAILURE,
151 "the -L and -h options "
152 "may not be specified together.");
153 fts_options &= ~FTS_PHYSICAL;
154 fts_options |= FTS_LOGICAL;
155 }
156 } else if (!hflag)
157 fts_options |= FTS_COMFOLLOW;
158
159 uid = (uid_t)-1;
160 gid = (gid_t)-1;
161 if (reference == NULL) {
162 if (ischown) {
163 if ((cp = strchr(*argv, ':')) != NULL) {
164 *cp++ = '\0';
165 a_gid(cp);
166 }
167 #ifdef SUPPORT_DOT
168 else if ((cp = strrchr(*argv, '.')) != NULL) {
169 if (uid_from_user(*argv, &uid) == -1) {
170 *cp++ = '\0';
171 a_gid(cp);
172 }
173 }
174 #endif
175 a_uid(*argv);
176 } else
177 a_gid(*argv);
178 argv++;
179 } else {
180 struct stat st;
181
182 if (stat(reference, &st) == -1)
183 err(EXIT_FAILURE, "Cannot stat `%s'", reference);
184 if (ischown)
185 uid = st.st_uid;
186 gid = st.st_gid;
187 }
188
189 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
190 err(EXIT_FAILURE, "fts_open");
191
192 for (rval = EXIT_SUCCESS; (p = fts_read(ftsp)) != NULL;) {
193 change_owner = chown;
194 switch (p->fts_info) {
195 case FTS_D:
196 if (!Rflag) /* Change it at FTS_DP. */
197 fts_set(ftsp, p, FTS_SKIP);
198 continue;
199 case FTS_DNR: /* Warn, chown, continue. */
200 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
201 rval = EXIT_FAILURE;
202 break;
203 case FTS_ERR: /* Warn, continue. */
204 case FTS_NS:
205 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
206 rval = EXIT_FAILURE;
207 continue;
208 case FTS_SL: /* Ignore unless -h. */
209 /*
210 * All symlinks we found while doing a physical
211 * walk end up here.
212 */
213 if (!hflag)
214 continue;
215 /*
216 * Note that if we follow a symlink, fts_info is
217 * not FTS_SL but FTS_F or whatever. And we should
218 * use lchown only for FTS_SL and should use chown
219 * for others.
220 */
221 change_owner = lchown;
222 break;
223 case FTS_SLNONE: /* Ignore. */
224 /*
225 * The only symlinks that end up here are ones that
226 * don't point to anything. Note that if we are
227 * doing a phisycal walk, we never reach here unless
228 * we asked to follow explicitly.
229 */
230 continue;
231 default:
232 break;
233 }
234
235 if ((*change_owner)(p->fts_accpath, uid, gid) && !fflag) {
236 warn("%s", p->fts_path);
237 rval = EXIT_FAILURE;
238 } else {
239 if (vflag)
240 printf("%s\n", p->fts_path);
241 }
242 }
243 if (errno)
244 err(EXIT_FAILURE, "fts_read");
245 exit(rval);
246 /* NOTREACHED */
247 }
248
249 static void
a_gid(const char * s)250 a_gid(const char *s)
251 {
252 struct group *gr;
253
254 if (*s == '\0') /* Argument was "uid[:.]". */
255 return;
256 gr = *s == '#' ? NULL : getgrnam(s);
257 if (gr == NULL)
258 gid = id(s, "group");
259 else
260 gid = gr->gr_gid;
261 return;
262 }
263
264 static void
a_uid(const char * s)265 a_uid(const char *s)
266 {
267 if (*s == '\0') /* Argument was "[:.]gid". */
268 return;
269 if (*s == '#' || uid_from_user(s, &uid) == -1) {
270 uid = id(s, "user");
271 }
272 return;
273 }
274
275 static id_t
id(const char * name,const char * type)276 id(const char *name, const char *type)
277 {
278 id_t val;
279 char *ep;
280
281 errno = 0;
282 if (*name == '#')
283 name++;
284 val = (id_t)strtoul(name, &ep, 10);
285 if (errno)
286 err(EXIT_FAILURE, "%s", name);
287 if (*ep != '\0')
288 errx(EXIT_FAILURE, "%s: invalid %s name", name, type);
289 return (val);
290 }
291
292 static void
usage(void)293 usage(void)
294 {
295
296 (void)fprintf(stderr,
297 "Usage: %s [-R [-H | -L | -P]] [-fhv] %s file ...\n"
298 "\t%s [-R [-H | -L | -P]] [-fhv] --reference=rfile file ...\n",
299 myname, ischown ? "owner:group|owner|:group" : "group",
300 myname);
301 exit(EXIT_FAILURE);
302 }
303