chown.c revision 97732 
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 97732 2002-06-02 09:32:39Z tjr $";
46#endif
47#endif /* not lint */
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 __P((const char *));
63void	a_uid __P((const char *));
64void	chownerr __P((const char *));
65u_long	id __P((const char *, const char *));
66void	usage __P((void));
67int	main __P((int argc, char *argv[]));
68
69uid_t uid;
70gid_t gid;
71int ischown;
72const char *gname;
73
74int
75main(argc, argv)
76	int argc;
77	char *argv[];
78{
79	FTS *ftsp;
80	FTSENT *p;
81	int Hflag, Lflag, Rflag, fflag, hflag, vflag;
82	int ch, fts_options, rval;
83	char *cp;
84
85	cp = strrchr(argv[0], '/');
86	cp = (cp != NULL) ? cp + 1 : argv[0];
87	ischown = (strcmp(cp, "chown") == 0);
88
89	Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
90	while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
91		switch (ch) {
92		case 'H':
93			Hflag = 1;
94			Lflag = 0;
95			break;
96		case 'L':
97			Lflag = 1;
98			Hflag = 0;
99			break;
100		case 'P':
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 && (Hflag || Lflag))
128			errx(1, "the -R%c and -h options may not be "
129			    "specified together", Hflag ? 'H' : 'L');
130		if (Hflag)
131			fts_options |= FTS_COMFOLLOW;
132		else if (Lflag) {
133			fts_options &= ~FTS_PHYSICAL;
134			fts_options |= FTS_LOGICAL;
135		}
136	} else
137		fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
138
139	uid = (uid_t)-1;
140	gid = (gid_t)-1;
141	if (ischown) {
142		if ((cp = strchr(*argv, ':')) != NULL) {
143			*cp++ = '\0';
144			a_gid(cp);
145		}
146#ifdef SUPPORT_DOT
147		else if ((cp = strchr(*argv, '.')) != NULL) {
148			*cp++ = '\0';
149			a_gid(cp);
150		}
151#endif
152		a_uid(*argv);
153	} else
154		a_gid(*argv);
155
156	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
157		err(1, NULL);
158
159	for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
160		switch (p->fts_info) {
161		case FTS_D:			/* Change it at FTS_DP. */
162			if (!Rflag)
163				fts_set(ftsp, p, FTS_SKIP);
164			continue;
165		case FTS_DNR:			/* Warn, chown. */
166			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
167			rval = 1;
168			break;
169		case FTS_ERR:			/* Warn, continue. */
170		case FTS_NS:
171			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
172			rval = 1;
173			continue;
174		case FTS_SL:
175		case FTS_SLNONE:
176			/*
177			 * The only symlinks that end up here are ones that
178			 * don't point to anything and ones that we found
179			 * doing a physical walk.
180			 */
181			if (hflag)
182				break;
183			else
184				continue;
185		default:
186			break;
187		}
188		if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
189		    (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
190			continue;
191		if ((hflag ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
192			if (!fflag) {
193				chownerr(p->fts_path);
194				rval = 1;
195			}
196		} else {
197			if (vflag)
198				printf("%s\n", p->fts_path);
199		}
200	}
201	if (errno)
202		err(1, "fts_read");
203	exit(rval);
204}
205
206void
207a_gid(s)
208	const char *s;
209{
210	struct group *gr;
211
212	if (*s == '\0')			/* Argument was "uid[:.]". */
213		return;
214	gname = s;
215	gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
216}
217
218void
219a_uid(s)
220	const char *s;
221{
222	struct passwd *pw;
223
224	if (*s == '\0')			/* Argument was "[:.]gid". */
225		return;
226	uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
227}
228
229u_long
230id(name, type)
231	const char *name, *type;
232{
233	u_long val;
234	char *ep;
235
236	/*
237	 * XXX
238	 * We know that uid_t's and gid_t's are unsigned longs.
239	 */
240	errno = 0;
241	val = strtoul(name, &ep, 10);
242	if (errno)
243		err(1, "%s", name);
244	if (*ep != '\0')
245		errx(1, "%s: illegal %s name", name, type);
246	return (val);
247}
248
249void
250chownerr(file)
251	const char *file;
252{
253	static uid_t euid = -1;
254	static int ngroups = -1;
255	gid_t groups[NGROUPS_MAX];
256
257	/* Check for chown without being root. */
258	if (errno != EPERM || (uid != (uid_t)-1 &&
259	    euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
260		warn("%s", file);
261		return;
262	}
263
264	/* Check group membership; kernel just returns EPERM. */
265	if (gid != (gid_t)-1 && ngroups == -1 &&
266	    euid == (uid_t)-1 && (euid = geteuid()) != 0) {
267		ngroups = getgroups(NGROUPS_MAX, groups);
268		while (--ngroups >= 0 && gid != groups[ngroups]);
269		if (ngroups < 0) {
270			warnx("you are not a member of group %s", gname);
271			return;
272		}
273	}
274	warn("%s", file);
275}
276
277void
278usage()
279{
280
281	if (ischown)
282		(void)fprintf(stderr, "%s\n%s\n",
283		    "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
284		    " file ...",
285		    "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
286	else
287		(void)fprintf(stderr, "%s\n",
288		    "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
289	exit(1);
290}
291