chown.c revision 50479 
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 50479 1999-08-28 01:35:59Z peter $";
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;
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 = 0;
89	while ((ch = getopt(argc, argv, "HLPRfh")) != -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 '?':
113		default:
114			usage();
115		}
116	argv += optind;
117	argc -= optind;
118
119	if (argc < 2)
120		usage();
121
122	fts_options = FTS_PHYSICAL;
123	if (Rflag) {
124		if (hflag && (Lflag || Hflag))
125			errx(1, "the -R and -h options may not be specified together");
126		if (Hflag)
127			fts_options |= FTS_COMFOLLOW;
128		if (Lflag) {
129			fts_options &= ~FTS_PHYSICAL;
130			fts_options |= FTS_LOGICAL;
131		}
132	}
133
134	uid = gid = -1;
135	if (ischown) {
136		if ((cp = strchr(*argv, ':')) != NULL) {
137			*cp++ = '\0';
138			a_gid(cp);
139		}
140#ifdef SUPPORT_DOT
141		else if ((cp = strchr(*argv, '.')) != NULL) {
142			*cp++ = '\0';
143			a_gid(cp);
144		}
145#endif
146		a_uid(*argv);
147	} else
148		a_gid(*argv);
149
150	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
151		err(1, NULL);
152
153	for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
154		switch (p->fts_info) {
155		case FTS_D: 			/* Change it at FTS_DP. */
156			if (!Rflag)
157				fts_set(ftsp, p, FTS_SKIP);
158			continue;
159		case FTS_DNR:			/* Warn, chown, continue. */
160			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
161			rval = 1;
162			break;
163		case FTS_ERR:			/* Warn, continue. */
164		case FTS_NS:
165			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
166			rval = 1;
167			continue;
168		case FTS_SL:			/* Ignore. */
169		case FTS_SLNONE:
170			/*
171			 * The only symlinks that end up here are ones that
172			 * don't point to anything and ones that we found
173			 * doing a physical walk.
174			 */
175			if (hflag)
176				break;
177			else
178				continue;
179		default:
180			break;
181		}
182		if (hflag) {
183			if (lchown(p->fts_accpath, uid, gid) && !fflag) {
184				chownerr(p->fts_path);
185				rval = 1;
186			}
187		} else {
188			if (chown(p->fts_accpath, uid, gid) && !fflag) {
189				chownerr(p->fts_path);
190				rval = 1;
191			}
192		}
193	}
194	if (errno)
195		err(1, "fts_read");
196	exit(rval);
197}
198
199void
200a_gid(s)
201	char *s;
202{
203	struct group *gr;
204
205	if (*s == '\0')			/* Argument was "uid[:.]". */
206		return;
207	gname = s;
208	gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
209}
210
211void
212a_uid(s)
213	char *s;
214{
215	struct passwd *pw;
216
217	if (*s == '\0')			/* Argument was "[:.]gid". */
218		return;
219	uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
220}
221
222u_long
223id(name, type)
224	char *name, *type;
225{
226	u_long val;
227	char *ep;
228
229	/*
230	 * XXX
231	 * We know that uid_t's and gid_t's are unsigned longs.
232	 */
233	errno = 0;
234	val = strtoul(name, &ep, 10);
235	if (errno)
236		err(1, "%s", name);
237	if (*ep != '\0')
238		errx(1, "%s: illegal %s name", name, type);
239	return (val);
240}
241
242void
243chownerr(file)
244	char *file;
245{
246	static int euid = -1, ngroups = -1;
247	gid_t groups[NGROUPS];
248
249	/* Check for chown without being root. */
250	if (errno != EPERM ||
251	    (uid != -1 && euid == -1 && (euid = geteuid()) != 0))
252		err(1, "%s", file);
253
254	/* Check group membership; kernel just returns EPERM. */
255	if (gid != -1 && ngroups == -1 &&
256	    euid == -1 && (euid = geteuid()) != 0) {
257		ngroups = getgroups(NGROUPS, groups);
258		while (--ngroups >= 0 && gid != groups[ngroups]);
259		if (ngroups < 0)
260			errx(1, "you are not a member of group %s", gname);
261	}
262	warn("%s", file);
263}
264
265void
266usage()
267{
268	(void)fprintf(stderr, "%s\n%s\n%s\n",
269	    "usage: chown [-R [-H | -L | -P]] [-f] [-h] owner[:group] file ...",
270	    "       chown [-R [-H | -L | -P]] [-f] [-h] :group file ...",
271	    "       chgrp [-R [-H | -L | -P]] [-f] [-h] group file ...");
272	exit(1);
273}
274