xref: /freebsd/usr.sbin/extattr/rmextattr.c (revision 1137d1a7e575a897d6d7d5784c4c01498c419d9b)
1a068c194SPoul-Henning Kamp /*-
21de7b4b8SPedro F. Giffuni  * SPDX-License-Identifier: BSD-3-Clause
31de7b4b8SPedro F. Giffuni  *
452271f82SRobert Watson  * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
5a068c194SPoul-Henning Kamp  * Copyright (c) 2002 Poul-Henning Kamp.
6a068c194SPoul-Henning Kamp  * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
7a068c194SPoul-Henning Kamp  * All rights reserved.
8a068c194SPoul-Henning Kamp  *
9a068c194SPoul-Henning Kamp  * This software was developed for the FreeBSD Project by Poul-Henning
10a068c194SPoul-Henning Kamp  * Kamp and Network Associates Laboratories, the Security Research Division
11a068c194SPoul-Henning Kamp  * of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
12a068c194SPoul-Henning Kamp  * ("CBOSS"), as part of the DARPA CHATS research program
13a068c194SPoul-Henning Kamp  *
14a068c194SPoul-Henning Kamp  * Redistribution and use in source and binary forms, with or without
15a068c194SPoul-Henning Kamp  * modification, are permitted provided that the following conditions
16a068c194SPoul-Henning Kamp  * are met:
17a068c194SPoul-Henning Kamp  * 1. Redistributions of source code must retain the above copyright
18a068c194SPoul-Henning Kamp  *    notice, this list of conditions and the following disclaimer.
19a068c194SPoul-Henning Kamp  * 2. Redistributions in binary form must reproduce the above copyright
20a068c194SPoul-Henning Kamp  *    notice, this list of conditions and the following disclaimer in the
21a068c194SPoul-Henning Kamp  *    documentation and/or other materials provided with the distribution.
22a068c194SPoul-Henning Kamp  * 3. The names of the authors may not be used to endorse or promote
23a068c194SPoul-Henning Kamp  *    products derived from this software without specific prior written
24a068c194SPoul-Henning Kamp  *    permission.
25a068c194SPoul-Henning Kamp  *
26a068c194SPoul-Henning Kamp  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27a068c194SPoul-Henning Kamp  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28a068c194SPoul-Henning Kamp  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29a068c194SPoul-Henning Kamp  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30a068c194SPoul-Henning Kamp  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31a068c194SPoul-Henning Kamp  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32a068c194SPoul-Henning Kamp  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33a068c194SPoul-Henning Kamp  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34a068c194SPoul-Henning Kamp  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35a068c194SPoul-Henning Kamp  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36a068c194SPoul-Henning Kamp  * SUCH DAMAGE.
37a068c194SPoul-Henning Kamp  *
38a068c194SPoul-Henning Kamp  * $FreeBSD$
39a068c194SPoul-Henning Kamp  */
40a068c194SPoul-Henning Kamp 
41a068c194SPoul-Henning Kamp #include <sys/types.h>
42c29930cfSAlan Somers #include <sys/sbuf.h>
43a068c194SPoul-Henning Kamp #include <sys/uio.h>
44a068c194SPoul-Henning Kamp #include <sys/extattr.h>
45a068c194SPoul-Henning Kamp 
467522ecb3SRobert Watson #include <libgen.h>
47a068c194SPoul-Henning Kamp #include <libutil.h>
48a068c194SPoul-Henning Kamp #include <stdio.h>
49a068c194SPoul-Henning Kamp #include <stdlib.h>
50a068c194SPoul-Henning Kamp #include <string.h>
51a068c194SPoul-Henning Kamp #include <unistd.h>
52a068c194SPoul-Henning Kamp #include <vis.h>
53a068c194SPoul-Henning Kamp #include <err.h>
54a068c194SPoul-Henning Kamp #include <errno.h>
55a068c194SPoul-Henning Kamp 
56a068c194SPoul-Henning Kamp static enum { EADUNNO, EAGET, EASET, EARM, EALS } what = EADUNNO;
57a068c194SPoul-Henning Kamp 
58a068c194SPoul-Henning Kamp static void __dead2
59a068c194SPoul-Henning Kamp usage(void)
60a068c194SPoul-Henning Kamp {
61a068c194SPoul-Henning Kamp 
62a068c194SPoul-Henning Kamp 	switch (what) {
63a068c194SPoul-Henning Kamp 	case EAGET:
646c3fb112SRobert Watson 		fprintf(stderr, "usage: getextattr [-fhqsx] attrnamespace");
65a068c194SPoul-Henning Kamp 		fprintf(stderr, " attrname filename ...\n");
66a068c194SPoul-Henning Kamp 		exit(-1);
67a068c194SPoul-Henning Kamp 	case EASET:
68cb0187a0SBrian Feldman 		fprintf(stderr, "usage: setextattr [-fhnq] attrnamespace");
69a068c194SPoul-Henning Kamp 		fprintf(stderr, " attrname attrvalue filename ...\n");
70c29930cfSAlan Somers 		fprintf(stderr, "   or  setextattr -i [-fhnq] attrnamespace");
71c29930cfSAlan Somers 		fprintf(stderr, " attrname filename ...\n");
72a068c194SPoul-Henning Kamp 		exit(-1);
73a068c194SPoul-Henning Kamp 	case EARM:
746c3fb112SRobert Watson 		fprintf(stderr, "usage: rmextattr [-fhq] attrnamespace");
75a068c194SPoul-Henning Kamp 		fprintf(stderr, " attrname filename ...\n");
76a068c194SPoul-Henning Kamp 		exit(-1);
77a068c194SPoul-Henning Kamp 	case EALS:
786c3fb112SRobert Watson 		fprintf(stderr, "usage: lsextattr [-fhq] attrnamespace");
79a068c194SPoul-Henning Kamp 		fprintf(stderr, " filename ...\n");
80a068c194SPoul-Henning Kamp 		exit(-1);
81a068c194SPoul-Henning Kamp 	case EADUNNO:
82a068c194SPoul-Henning Kamp 	default:
83a068c194SPoul-Henning Kamp 		fprintf(stderr, "usage: (getextattr|lsextattr|rmextattr");
84a068c194SPoul-Henning Kamp 		fprintf(stderr, "|setextattr)\n");
85a068c194SPoul-Henning Kamp 		exit (-1);
86a068c194SPoul-Henning Kamp 	}
87a068c194SPoul-Henning Kamp }
88a068c194SPoul-Henning Kamp 
89a068c194SPoul-Henning Kamp static void
90a068c194SPoul-Henning Kamp mkbuf(char **buf, int *oldlen, int newlen)
91a068c194SPoul-Henning Kamp {
92a068c194SPoul-Henning Kamp 
93a068c194SPoul-Henning Kamp 	if (*oldlen >= newlen)
94a068c194SPoul-Henning Kamp 		return;
95a068c194SPoul-Henning Kamp 	if (*buf != NULL)
96a068c194SPoul-Henning Kamp 		free(*buf);
97a068c194SPoul-Henning Kamp 	*buf = malloc(newlen);
98a068c194SPoul-Henning Kamp 	if (*buf == NULL)
99a068c194SPoul-Henning Kamp 		err(1, "malloc");
100a068c194SPoul-Henning Kamp 	*oldlen = newlen;
101a068c194SPoul-Henning Kamp 	return;
102a068c194SPoul-Henning Kamp }
103a068c194SPoul-Henning Kamp 
104a068c194SPoul-Henning Kamp int
105a068c194SPoul-Henning Kamp main(int argc, char *argv[])
106a068c194SPoul-Henning Kamp {
107*1137d1a7SAlan Somers #define STDIN_BUF_SZ 4096
108c29930cfSAlan Somers 	char	 stdin_data[STDIN_BUF_SZ];
109c29930cfSAlan Somers 	char	*p;
110a068c194SPoul-Henning Kamp 
111a068c194SPoul-Henning Kamp 	const char *options, *attrname;
112e324bf91SMatthew D Fleming 	size_t	len;
113e324bf91SMatthew D Fleming 	ssize_t	ret;
114c29930cfSAlan Somers 	int	 ch, error, i, arg_counter, attrnamespace, minargc;
115a068c194SPoul-Henning Kamp 
116c29930cfSAlan Somers 	char   *visbuf = NULL;
117c29930cfSAlan Somers 	int	visbuflen = 0;
118c29930cfSAlan Somers 	char   *buf = NULL;
119c29930cfSAlan Somers 	int	buflen = 0;
120c29930cfSAlan Somers 	struct	sbuf *attrvalue = NULL;
121a068c194SPoul-Henning Kamp 	int	flag_force = 0;
1226c3fb112SRobert Watson 	int	flag_nofollow = 0;
123cb0187a0SBrian Feldman 	int	flag_null = 0;
124c29930cfSAlan Somers 	int	count_quiet = 0;
125c29930cfSAlan Somers 	int	flag_from_stdin = 0;
126a068c194SPoul-Henning Kamp 	int	flag_string = 0;
127a068c194SPoul-Henning Kamp 	int	flag_hex = 0;
128a068c194SPoul-Henning Kamp 
1297522ecb3SRobert Watson 	p = basename(argv[0]);
130a068c194SPoul-Henning Kamp 	if (p == NULL)
131a068c194SPoul-Henning Kamp 		p = argv[0];
132a068c194SPoul-Henning Kamp 	if (!strcmp(p, "getextattr")) {
133a068c194SPoul-Henning Kamp 		what = EAGET;
1346c3fb112SRobert Watson 		options = "fhqsx";
135878382faSBrian Feldman 		minargc = 3;
136a068c194SPoul-Henning Kamp 	} else if (!strcmp(p, "setextattr")) {
137a068c194SPoul-Henning Kamp 		what = EASET;
138c29930cfSAlan Somers 		options = "fhinq";
139c29930cfSAlan Somers 		minargc = 3;
140a068c194SPoul-Henning Kamp 	} else if (!strcmp(p, "rmextattr")) {
141a068c194SPoul-Henning Kamp 		what = EARM;
1426c3fb112SRobert Watson 		options = "fhq";
143878382faSBrian Feldman 		minargc = 3;
144a068c194SPoul-Henning Kamp 	} else if (!strcmp(p, "lsextattr")) {
145a068c194SPoul-Henning Kamp 		what = EALS;
1466c3fb112SRobert Watson 		options = "fhq";
147878382faSBrian Feldman 		minargc = 2;
148a068c194SPoul-Henning Kamp 	} else {
149a068c194SPoul-Henning Kamp 		usage();
150a068c194SPoul-Henning Kamp 	}
151a068c194SPoul-Henning Kamp 
152a068c194SPoul-Henning Kamp 	while ((ch = getopt(argc, argv, options)) != -1) {
153a068c194SPoul-Henning Kamp 		switch (ch) {
154a068c194SPoul-Henning Kamp 		case 'f':
155a068c194SPoul-Henning Kamp 			flag_force = 1;
156a068c194SPoul-Henning Kamp 			break;
1576c3fb112SRobert Watson 		case 'h':
1586c3fb112SRobert Watson 			flag_nofollow = 1;
1596c3fb112SRobert Watson 			break;
160c29930cfSAlan Somers 		case 'i':
161c29930cfSAlan Somers 			flag_from_stdin = 1;
162c29930cfSAlan Somers 			break;
163cb0187a0SBrian Feldman 		case 'n':
164cb0187a0SBrian Feldman 			flag_null = 1;
165cb0187a0SBrian Feldman 			break;
166a068c194SPoul-Henning Kamp 		case 'q':
167c29930cfSAlan Somers 			count_quiet += 1;
168a068c194SPoul-Henning Kamp 			break;
169a068c194SPoul-Henning Kamp 		case 's':
170a068c194SPoul-Henning Kamp 			flag_string = 1;
171a068c194SPoul-Henning Kamp 			break;
172a068c194SPoul-Henning Kamp 		case 'x':
173a068c194SPoul-Henning Kamp 			flag_hex = 1;
174a068c194SPoul-Henning Kamp 			break;
175a068c194SPoul-Henning Kamp 		case '?':
176a068c194SPoul-Henning Kamp 		default:
177a068c194SPoul-Henning Kamp 			usage();
178a068c194SPoul-Henning Kamp 		}
179a068c194SPoul-Henning Kamp 	}
180a068c194SPoul-Henning Kamp 
181a068c194SPoul-Henning Kamp 	argc -= optind;
182a068c194SPoul-Henning Kamp 	argv += optind;
183a068c194SPoul-Henning Kamp 
184c29930cfSAlan Somers 	if (what == EASET && flag_from_stdin == 0)
185c29930cfSAlan Somers 		minargc++;
186c29930cfSAlan Somers 
187878382faSBrian Feldman 	if (argc < minargc)
188a068c194SPoul-Henning Kamp 		usage();
189a068c194SPoul-Henning Kamp 
190a068c194SPoul-Henning Kamp 	error = extattr_string_to_namespace(argv[0], &attrnamespace);
191a068c194SPoul-Henning Kamp 	if (error)
192b689e6a8SRobert Watson 		err(-1, "%s", argv[0]);
193a068c194SPoul-Henning Kamp 	argc--; argv++;
194a068c194SPoul-Henning Kamp 
19552271f82SRobert Watson 	if (what != EALS) {
196a068c194SPoul-Henning Kamp 		attrname = argv[0];
197a068c194SPoul-Henning Kamp 		argc--; argv++;
19852271f82SRobert Watson 	} else
19952271f82SRobert Watson 		attrname = NULL;
200a068c194SPoul-Henning Kamp 
201a068c194SPoul-Henning Kamp 	if (what == EASET) {
202c29930cfSAlan Somers 		attrvalue = sbuf_new_auto();
203c29930cfSAlan Somers 		if (flag_from_stdin) {
204c29930cfSAlan Somers 			while ((error = read(0, stdin_data, STDIN_BUF_SZ)) > 0)
205c29930cfSAlan Somers 				sbuf_bcat(attrvalue, stdin_data, error);
206c29930cfSAlan Somers 		} else {
207c29930cfSAlan Somers 			sbuf_cpy(attrvalue, argv[0]);
208a068c194SPoul-Henning Kamp 			argc--; argv++;
209a068c194SPoul-Henning Kamp 		}
210c29930cfSAlan Somers 		sbuf_finish(attrvalue);
211c29930cfSAlan Somers 	}
212a068c194SPoul-Henning Kamp 
213a068c194SPoul-Henning Kamp 	for (arg_counter = 0; arg_counter < argc; arg_counter++) {
214a068c194SPoul-Henning Kamp 		switch (what) {
215a068c194SPoul-Henning Kamp 		case EARM:
2166c3fb112SRobert Watson 			if (flag_nofollow)
2176c3fb112SRobert Watson 				error = extattr_delete_link(argv[arg_counter],
2186c3fb112SRobert Watson 				    attrnamespace, attrname);
2196c3fb112SRobert Watson 			else
220a068c194SPoul-Henning Kamp 				error = extattr_delete_file(argv[arg_counter],
221a068c194SPoul-Henning Kamp 				    attrnamespace, attrname);
222a068c194SPoul-Henning Kamp 			if (error >= 0)
223a068c194SPoul-Henning Kamp 				continue;
224a068c194SPoul-Henning Kamp 			break;
225a068c194SPoul-Henning Kamp 		case EASET:
226c29930cfSAlan Somers 			len = sbuf_len(attrvalue) + flag_null;
2276c3fb112SRobert Watson 			if (flag_nofollow)
228e324bf91SMatthew D Fleming 				ret = extattr_set_link(argv[arg_counter],
229c29930cfSAlan Somers 				    attrnamespace, attrname,
230c29930cfSAlan Somers 				    sbuf_data(attrvalue), len);
2316c3fb112SRobert Watson 			else
232e324bf91SMatthew D Fleming 				ret = extattr_set_file(argv[arg_counter],
233c29930cfSAlan Somers 				    attrnamespace, attrname,
234c29930cfSAlan Somers 				    sbuf_data(attrvalue), len);
235e324bf91SMatthew D Fleming 			if (ret >= 0) {
236c29930cfSAlan Somers 				if ((size_t)ret != len && !count_quiet) {
237e324bf91SMatthew D Fleming 					warnx("Set %zd bytes of %zu for %s",
238e324bf91SMatthew D Fleming 					    ret, len, attrname);
239e324bf91SMatthew D Fleming 				}
240a068c194SPoul-Henning Kamp 				continue;
241e324bf91SMatthew D Fleming 			}
242a068c194SPoul-Henning Kamp 			break;
243a068c194SPoul-Henning Kamp 		case EALS:
24452271f82SRobert Watson 			if (flag_nofollow)
245e324bf91SMatthew D Fleming 				ret = extattr_list_link(argv[arg_counter],
24652271f82SRobert Watson 				    attrnamespace, NULL, 0);
24752271f82SRobert Watson 			else
248e324bf91SMatthew D Fleming 				ret = extattr_list_file(argv[arg_counter],
24952271f82SRobert Watson 				    attrnamespace, NULL, 0);
250e324bf91SMatthew D Fleming 			if (ret < 0)
25152271f82SRobert Watson 				break;
252e324bf91SMatthew D Fleming 			mkbuf(&buf, &buflen, ret);
25352271f82SRobert Watson 			if (flag_nofollow)
254e324bf91SMatthew D Fleming 				ret = extattr_list_link(argv[arg_counter],
25552271f82SRobert Watson 				    attrnamespace, buf, buflen);
25652271f82SRobert Watson 			else
257e324bf91SMatthew D Fleming 				ret = extattr_list_file(argv[arg_counter],
25852271f82SRobert Watson 				    attrnamespace, buf, buflen);
259e324bf91SMatthew D Fleming 			if (ret < 0)
26052271f82SRobert Watson 				break;
261c29930cfSAlan Somers 			if (!count_quiet)
26252271f82SRobert Watson 				printf("%s\t", argv[arg_counter]);
263e324bf91SMatthew D Fleming 			for (i = 0; i < ret; i += ch + 1) {
26407c19910SZachary Loafman 			    /* The attribute name length is unsigned. */
26507c19910SZachary Loafman 			    ch = (unsigned char)buf[i];
26652271f82SRobert Watson 			    printf("%s%*.*s", i ? "\t" : "",
26707c19910SZachary Loafman 				ch, ch, buf + i + 1);
26807c19910SZachary Loafman 			}
269c29930cfSAlan Somers 			if (!count_quiet || ret > 0)
27052271f82SRobert Watson 				printf("\n");
27152271f82SRobert Watson 			continue;
272a068c194SPoul-Henning Kamp 		case EAGET:
2736c3fb112SRobert Watson 			if (flag_nofollow)
274e324bf91SMatthew D Fleming 				ret = extattr_get_link(argv[arg_counter],
2756c3fb112SRobert Watson 				    attrnamespace, attrname, NULL, 0);
2766c3fb112SRobert Watson 			else
277e324bf91SMatthew D Fleming 				ret = extattr_get_file(argv[arg_counter],
278a068c194SPoul-Henning Kamp 				    attrnamespace, attrname, NULL, 0);
279e324bf91SMatthew D Fleming 			if (ret < 0)
280a068c194SPoul-Henning Kamp 				break;
281e324bf91SMatthew D Fleming 			mkbuf(&buf, &buflen, ret);
2826c3fb112SRobert Watson 			if (flag_nofollow)
283e324bf91SMatthew D Fleming 				ret = extattr_get_link(argv[arg_counter],
2846c3fb112SRobert Watson 				    attrnamespace, attrname, buf, buflen);
2856c3fb112SRobert Watson 			else
286e324bf91SMatthew D Fleming 				ret = extattr_get_file(argv[arg_counter],
287a068c194SPoul-Henning Kamp 				    attrnamespace, attrname, buf, buflen);
288e324bf91SMatthew D Fleming 			if (ret < 0)
289a068c194SPoul-Henning Kamp 				break;
290c29930cfSAlan Somers 			if (!count_quiet)
291a068c194SPoul-Henning Kamp 				printf("%s\t", argv[arg_counter]);
292a068c194SPoul-Henning Kamp 			if (flag_string) {
293e324bf91SMatthew D Fleming 				mkbuf(&visbuf, &visbuflen, ret * 4 + 1);
294e324bf91SMatthew D Fleming 				strvisx(visbuf, buf, ret,
295a068c194SPoul-Henning Kamp 				    VIS_SAFE | VIS_WHITE);
296c29930cfSAlan Somers 				printf("\"%s\"", visbuf);
297a068c194SPoul-Henning Kamp 			} else if (flag_hex) {
298e324bf91SMatthew D Fleming 				for (i = 0; i < ret; i++)
29979e29f95SAlan Somers 					printf("%s%02x", i ? " " : "",
30079e29f95SAlan Somers 							(unsigned char)buf[i]);
301a068c194SPoul-Henning Kamp 			} else {
302e324bf91SMatthew D Fleming 				fwrite(buf, ret, 1, stdout);
303c29930cfSAlan Somers 			}
304c29930cfSAlan Somers 			if (count_quiet < 2)
305a068c194SPoul-Henning Kamp 				printf("\n");
306a068c194SPoul-Henning Kamp 			continue;
307a068c194SPoul-Henning Kamp 		default:
308a068c194SPoul-Henning Kamp 			break;
309a068c194SPoul-Henning Kamp 		}
310c29930cfSAlan Somers 		if (!count_quiet)
311a068c194SPoul-Henning Kamp 			warn("%s: failed", argv[arg_counter]);
312a068c194SPoul-Henning Kamp 		if (flag_force)
313a068c194SPoul-Henning Kamp 			continue;
314a068c194SPoul-Henning Kamp 		return(1);
315a068c194SPoul-Henning Kamp 	}
316a068c194SPoul-Henning Kamp 	return (0);
317a068c194SPoul-Henning Kamp }
318