chown.c revision 77333 
1/*
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)chown.c	8.8 (Berkeley) 4/4/94";
43#else
44static const char rcsid[] =
45  "$FreeBSD: head/usr.sbin/chown/chown.c 77333 2001-05-28 12:58:10Z ru $";
46#endif
47#endif /* not lint */
48
49#include <sys/param.h>
50#include <sys/stat.h>
51
52#include <ctype.h>
53#include <dirent.h>
54#include <err.h>
55#include <errno.h>
56#include <fts.h>
57#include <grp.h>
58#include <pwd.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64void	a_gid __P((char *));
65void	a_uid __P((char *));
66void	chownerr __P((char *));
67u_long	id __P((char *, char *));
68void	usage __P((void));
69
70uid_t uid;
71gid_t gid;
72int Rflag, ischown, fflag, hflag, vflag;
73char *gname, *myname;
74
75int
76main(argc, argv)
77	int argc;
78	char *argv[];
79{
80	FTS *ftsp;
81	FTSENT *p;
82	int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval;
83	char *cp;
84
85	myname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv;
86	ischown = myname[2] == 'o';
87
88	Hflag = Lflag = Pflag = hflag = vflag = 0;
89	while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
90		switch (ch) {
91		case 'H':
92			Hflag = 1;
93			Lflag = Pflag = 0;
94			break;
95		case 'L':
96			Lflag = 1;
97			Hflag = Pflag = 0;
98			break;
99		case 'P':
100			Pflag = 1;
101			Hflag = Lflag = 0;
102			break;
103		case 'R':
104			Rflag = 1;
105			break;
106		case 'f':
107			fflag = 1;
108			break;
109		case 'h':
110			hflag = 1;
111			break;
112		case 'v':
113			vflag = 1;
114			break;
115		case '?':
116		default:
117			usage();
118		}
119	argv += optind;
120	argc -= optind;
121
122	if (argc < 2)
123		usage();
124
125	if (Rflag) {
126		fts_options = FTS_PHYSICAL;
127		if (hflag && (Lflag || Hflag))
128			errx(1, "the -R and -h options may not be specified together");
129		if (Hflag)
130			fts_options |= FTS_COMFOLLOW;
131		if (Lflag) {
132			fts_options &= ~FTS_PHYSICAL;
133			fts_options |= FTS_LOGICAL;
134		}
135	} else
136		fts_options = FTS_LOGICAL;
137
138	uid = gid = -1;
139	if (ischown) {
140		if ((cp = strchr(*argv, ':')) != NULL) {
141			*cp++ = '\0';
142			a_gid(cp);
143		}
144#ifdef SUPPORT_DOT
145		else if ((cp = strchr(*argv, '.')) != NULL) {
146			*cp++ = '\0';
147			a_gid(cp);
148		}
149#endif
150		a_uid(*argv);
151	} else
152		a_gid(*argv);
153
154	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
155		err(1, NULL);
156
157	for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
158		switch (p->fts_info) {
159		case FTS_D: 			/* Change it at FTS_DP. */
160			if (!Rflag)
161				fts_set(ftsp, p, FTS_SKIP);
162			continue;
163		case FTS_DNR:			/* Warn, chown, continue. */
164			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
165			rval = 1;
166			break;
167		case FTS_ERR:			/* Warn, continue. */
168		case FTS_NS:
169			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
170			rval = 1;
171			continue;
172		case FTS_SL:			/* Ignore. */
173		case FTS_SLNONE:
174			/*
175			 * The only symlinks that end up here are ones that
176			 * don't point to anything and ones that we found
177			 * doing a physical walk.
178			 */
179			if (hflag)
180				break;
181			else
182				continue;
183		default:
184			break;
185		}
186		if ((uid == -1 || uid == p->fts_statp->st_uid) &&
187		    (gid == -1 || gid == p->fts_statp->st_gid))
188			continue;
189		if (hflag) {
190			if (lchown(p->fts_accpath, uid, gid) && !fflag) {
191				chownerr(p->fts_path);
192				rval = 1;
193			} else {
194			    	if (vflag)
195					(void)printf("%s\n", p->fts_accpath);
196			}
197		} else {
198			if (chown(p->fts_accpath, uid, gid) && !fflag) {
199				chownerr(p->fts_path);
200				rval = 1;
201			} else {
202			    	if (vflag)
203					(void)printf("%s\n", p->fts_accpath);
204			}
205		}
206	}
207	if (errno)
208		err(1, "fts_read");
209	exit(rval);
210}
211
212void
213a_gid(s)
214	char *s;
215{
216	struct group *gr;
217
218	if (*s == '\0')			/* Argument was "uid[:.]". */
219		return;
220	gname = s;
221	gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
222}
223
224void
225a_uid(s)
226	char *s;
227{
228	struct passwd *pw;
229
230	if (*s == '\0')			/* Argument was "[:.]gid". */
231		return;
232	uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
233}
234
235u_long
236id(name, type)
237	char *name, *type;
238{
239	u_long val;
240	char *ep;
241
242	/*
243	 * XXX
244	 * We know that uid_t's and gid_t's are unsigned longs.
245	 */
246	errno = 0;
247	val = strtoul(name, &ep, 10);
248	if (errno)
249		err(1, "%s", name);
250	if (*ep != '\0')
251		errx(1, "%s: illegal %s name", name, type);
252	return (val);
253}
254
255void
256chownerr(file)
257	char *file;
258{
259	static int euid = -1, ngroups = -1;
260	gid_t groups[NGROUPS];
261
262	/* Check for chown without being root. */
263	if (errno != EPERM ||
264	    (uid != -1 && euid == -1 && (euid = geteuid()) != 0))
265		err(1, "%s", file);
266
267	/* Check group membership; kernel just returns EPERM. */
268	if (gid != -1 && ngroups == -1 &&
269	    euid == -1 && (euid = geteuid()) != 0) {
270		ngroups = getgroups(NGROUPS, groups);
271		while (--ngroups >= 0 && gid != groups[ngroups]);
272		if (ngroups < 0)
273			errx(1, "you are not a member of group %s", gname);
274	}
275	warn("%s", file);
276}
277
278void
279usage()
280{
281	(void)fprintf(stderr, "%s\n%s\n%s\n",
282	    "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...",
283	    "       chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...",
284	    "       chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ...");
285	exit(1);
286}
287