chown.c revision 98935 
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 98935 2002-06-27 21:23:16Z jmallett $";
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			warnx("seperation of user and group with a period is deprecated");
149			*cp++ = '\0';
150			a_gid(cp);
151		}
152#endif
153		a_uid(*argv);
154	} else
155		a_gid(*argv);
156
157	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
158		err(1, NULL);
159
160	for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
161		switch (p->fts_info) {
162		case FTS_D:			/* Change it at FTS_DP. */
163			if (!Rflag)
164				fts_set(ftsp, p, FTS_SKIP);
165			continue;
166		case FTS_DNR:			/* Warn, chown. */
167			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
168			rval = 1;
169			break;
170		case FTS_ERR:			/* Warn, continue. */
171		case FTS_NS:
172			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
173			rval = 1;
174			continue;
175		case FTS_SL:
176		case FTS_SLNONE:
177			/*
178			 * The only symlinks that end up here are ones that
179			 * don't point to anything and ones that we found
180			 * doing a physical walk.
181			 */
182			if (hflag)
183				break;
184			else
185				continue;
186		default:
187			break;
188		}
189		if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
190		    (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
191			continue;
192		if ((hflag ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
193			if (!fflag) {
194				chownerr(p->fts_path);
195				rval = 1;
196			}
197		} else {
198			if (vflag)
199				printf("%s\n", p->fts_path);
200		}
201	}
202	if (errno)
203		err(1, "fts_read");
204	exit(rval);
205}
206
207void
208a_gid(s)
209	const char *s;
210{
211	struct group *gr;
212
213	if (*s == '\0')			/* Argument was "uid[:.]". */
214		return;
215	gname = s;
216	gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
217}
218
219void
220a_uid(s)
221	const char *s;
222{
223	struct passwd *pw;
224
225	if (*s == '\0')			/* Argument was "[:.]gid". */
226		return;
227	uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
228}
229
230u_long
231id(name, type)
232	const char *name, *type;
233{
234	u_long val;
235	char *ep;
236
237	/*
238	 * XXX
239	 * We know that uid_t's and gid_t's are unsigned longs.
240	 */
241	errno = 0;
242	val = strtoul(name, &ep, 10);
243	if (errno)
244		err(1, "%s", name);
245	if (*ep != '\0')
246		errx(1, "%s: illegal %s name", name, type);
247	return (val);
248}
249
250void
251chownerr(file)
252	const char *file;
253{
254	static uid_t euid = -1;
255	static int ngroups = -1;
256	gid_t groups[NGROUPS_MAX];
257
258	/* Check for chown without being root. */
259	if (errno != EPERM || (uid != (uid_t)-1 &&
260	    euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
261		warn("%s", file);
262		return;
263	}
264
265	/* Check group membership; kernel just returns EPERM. */
266	if (gid != (gid_t)-1 && ngroups == -1 &&
267	    euid == (uid_t)-1 && (euid = geteuid()) != 0) {
268		ngroups = getgroups(NGROUPS_MAX, groups);
269		while (--ngroups >= 0 && gid != groups[ngroups]);
270		if (ngroups < 0) {
271			warnx("you are not a member of group %s", gname);
272			return;
273		}
274	}
275	warn("%s", file);
276}
277
278void
279usage()
280{
281
282	if (ischown)
283		(void)fprintf(stderr, "%s\n%s\n",
284		    "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
285		    " file ...",
286		    "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
287	else
288		(void)fprintf(stderr, "%s\n",
289		    "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
290	exit(1);
291}
292