chown.c revision 100252 
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#endif
44#endif /* not lint */
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.sbin/chown/chown.c 100252 2002-07-17 16:22:24Z dwmalone $");
48
49#include <sys/param.h>
50#include <sys/stat.h>
51
52#include <err.h>
53#include <errno.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
62void	a_gid(const char *);
63void	a_uid(const char *);
64void	chownerr(const char *);
65u_long	id(const char *, const char *);
66void	usage(void);
67
68uid_t uid;
69gid_t gid;
70int ischown;
71const char *gname;
72
73int
74main(int argc, char **argv)
75{
76	FTS *ftsp;
77	FTSENT *p;
78	int Hflag, Lflag, Rflag, fflag, hflag, vflag;
79	int ch, fts_options, rval;
80	char *cp;
81
82	cp = strrchr(argv[0], '/');
83	cp = (cp != NULL) ? cp + 1 : argv[0];
84	ischown = (strcmp(cp, "chown") == 0);
85
86	Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
87	while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
88		switch (ch) {
89		case 'H':
90			Hflag = 1;
91			Lflag = 0;
92			break;
93		case 'L':
94			Lflag = 1;
95			Hflag = 0;
96			break;
97		case 'P':
98			Hflag = Lflag = 0;
99			break;
100		case 'R':
101			Rflag = 1;
102			break;
103		case 'f':
104			fflag = 1;
105			break;
106		case 'h':
107			hflag = 1;
108			break;
109		case 'v':
110			vflag = 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	if (Rflag) {
123		fts_options = FTS_PHYSICAL;
124		if (hflag && (Hflag || Lflag))
125			errx(1, "the -R%c and -h options may not be "
126			    "specified together", Hflag ? 'H' : 'L');
127		if (Hflag)
128			fts_options |= FTS_COMFOLLOW;
129		else if (Lflag) {
130			fts_options &= ~FTS_PHYSICAL;
131			fts_options |= FTS_LOGICAL;
132		}
133	} else
134		fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
135
136	uid = (uid_t)-1;
137	gid = (gid_t)-1;
138	if (ischown) {
139		if ((cp = strchr(*argv, ':')) != NULL) {
140			*cp++ = '\0';
141			a_gid(cp);
142		}
143#ifdef SUPPORT_DOT
144		else if ((cp = strchr(*argv, '.')) != NULL) {
145			warnx("separation of user and group with a period is deprecated");
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. */
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:
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 == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
187		    (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
188			continue;
189		if ((hflag ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
190			if (!fflag) {
191				chownerr(p->fts_path);
192				rval = 1;
193			}
194		} else {
195			if (vflag)
196				printf("%s\n", p->fts_path);
197		}
198	}
199	if (errno)
200		err(1, "fts_read");
201	exit(rval);
202}
203
204void
205a_gid(const char *s)
206{
207	struct group *gr;
208
209	if (*s == '\0')			/* Argument was "uid[:.]". */
210		return;
211	gname = s;
212	gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
213}
214
215void
216a_uid(const char *s)
217{
218	struct passwd *pw;
219
220	if (*s == '\0')			/* Argument was "[:.]gid". */
221		return;
222	uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
223}
224
225u_long
226id(const char *name, const char *type)
227{
228	u_long val;
229	char *ep;
230
231	/*
232	 * XXX
233	 * We know that uid_t's and gid_t's are unsigned longs.
234	 */
235	errno = 0;
236	val = strtoul(name, &ep, 10);
237	if (errno)
238		err(1, "%s", name);
239	if (*ep != '\0')
240		errx(1, "%s: illegal %s name", name, type);
241	return (val);
242}
243
244void
245chownerr(const char *file)
246{
247	static uid_t euid = -1;
248	static int ngroups = -1;
249	gid_t groups[NGROUPS_MAX];
250
251	/* Check for chown without being root. */
252	if (errno != EPERM || (uid != (uid_t)-1 &&
253	    euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
254		warn("%s", file);
255		return;
256	}
257
258	/* Check group membership; kernel just returns EPERM. */
259	if (gid != (gid_t)-1 && ngroups == -1 &&
260	    euid == (uid_t)-1 && (euid = geteuid()) != 0) {
261		ngroups = getgroups(NGROUPS_MAX, groups);
262		while (--ngroups >= 0 && gid != groups[ngroups]);
263		if (ngroups < 0) {
264			warnx("you are not a member of group %s", gname);
265			return;
266		}
267	}
268	warn("%s", file);
269}
270
271void
272usage(void)
273{
274
275	if (ischown)
276		(void)fprintf(stderr, "%s\n%s\n",
277		    "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
278		    " file ...",
279		    "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
280	else
281		(void)fprintf(stderr, "%s\n",
282		    "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
283	exit(1);
284}
285