xref: /netbsd-src/usr.sbin/extattrctl/extattrctl.c (revision bec77c5f430f4d289623bb3bbdd1fe59434fd314)
1 /*	$NetBSD: extattrctl.c,v 1.4 2011/08/31 13:32:36 joerg Exp $	*/
2 
3 /*-
4  * Copyright (c) 1999-2002 Robert N. M. Watson
5  * All rights reserved.
6  *
7  * This software was developed by Robert Watson for the TrustedBSD Project.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  * $FreeBSD: src/usr.sbin/extattrctl/extattrctl.c,v 1.19 2002/04/19 01:42:55 rwatson Exp $
31  */
32 
33 /*
34  * Developed by the TrustedBSD Project.
35  * Support for file system extended attribute.
36  */
37 
38 #include <sys/types.h>
39 #include <sys/uio.h>
40 #include <sys/extattr.h>
41 #include <sys/param.h>
42 #include <sys/mount.h>
43 
44 #include <ufs/ufs/extattr.h>
45 
46 #include <err.h>
47 #include <fcntl.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <util.h>
53 
54 #include <machine/bswap.h>
55 #include <machine/endian.h>
56 
57 static int needswap;
58 
59 static uint32_t
rw32(uint32_t v)60 rw32(uint32_t v)
61 {
62 	if (needswap)
63 		return (bswap32(v));
64 	return (v);
65 }
66 
67 __dead static void
usage(void)68 usage(void)
69 {
70 
71 	fprintf(stderr,
72 	    "usage:\n"
73 	    "  %s start path\n"
74 	    "  %s stop path\n"
75 	    "  %s initattr [-f] [-p path] attrsize attrfile\n"
76 	    "  %s showattr attrfile\n"
77 	    "  %s enable path attrnamespace attrname attrfile\n"
78 	    "  %s disable path attrnamespace attrname\n",
79 	    getprogname(), getprogname(), getprogname(),
80 	    getprogname(), getprogname(), getprogname());
81 	exit(1);
82 }
83 
84 static uint64_t
num_inodes_by_path(const char * path)85 num_inodes_by_path(const char *path)
86 {
87 	struct statvfs buf;
88 
89 	if (statvfs(path, &buf) == -1) {
90 		warn("statvfs(%s)", path);
91 		return (-1);
92 	}
93 
94 	return (buf.f_files);
95 }
96 
97 static const char zero_buf[8192];
98 
99 static int
initattr(int argc,char * argv[])100 initattr(int argc, char *argv[])
101 {
102 	struct ufs_extattr_fileheader uef;
103 	char *fs_path = NULL;
104 	int ch, i, error, flags;
105 	ssize_t wlen;
106 	size_t easize;
107 
108 	flags = O_CREAT | O_WRONLY | O_TRUNC | O_EXCL;
109 	optind = 0;
110 	while ((ch = getopt(argc, argv, "fp:r:w:")) != -1) {
111 		switch (ch) {
112 		case 'f':
113 			flags &= ~O_EXCL;
114 			break;
115 		case 'p':
116 			fs_path = optarg;
117 			break;
118 		case 'B':
119 #if BYTE_ORDER == LITTLE_ENDIAN
120 			if (strcmp(optarg, "le") == 0)
121 				needswap = 0;
122 			else if (strcmp(optarg, "be") == 0)
123 				needswap = 1;
124 			else
125 				usage();
126 #else
127 			if (strcmp(optarg, "be") == 0)
128 				needswap = 0;
129 			else if (strcmp(optarg, "le") == 0)
130 				needswap = 1;
131 			else
132 				usage();
133 #endif
134 			break;
135 		case '?':
136 		default:
137 			usage();
138 		}
139 	}
140 
141 	argc -= optind;
142 	argv += optind;
143 
144 	if (argc != 2)
145 		usage();
146 
147 	error = 0;
148 	if ((i = open(argv[1], flags, 0600)) == -1) {
149 		warn("open(%s)", argv[1]);
150 		return (-1);
151 	}
152 	uef.uef_magic = rw32(UFS_EXTATTR_MAGIC);
153 	uef.uef_version = rw32(UFS_EXTATTR_VERSION);
154 	uef.uef_size = rw32(atoi(argv[0]));
155 	if (write(i, &uef, sizeof(uef)) != sizeof(uef)) {
156 		warn("unable to write attribute file header");
157 		error = -1;
158 	} else if (fs_path != NULL) {
159 		easize = (sizeof(uef) + uef.uef_size) *
160 		    num_inodes_by_path(fs_path);
161 		while (easize > 0) {
162 			size_t x = (easize > sizeof(zero_buf)) ?
163 			    sizeof(zero_buf) : easize;
164 			wlen = write(i, zero_buf, x);
165 			if ((size_t)wlen != x) {
166 				warn("unable to write attribute file");
167 				error = -1;
168 				break;
169 			}
170 			easize -= wlen;
171 		}
172 	}
173 	close(i);
174 	if (error == -1) {
175 		unlink(argv[1]);
176 		return (-1);
177 	}
178 
179 	return (0);
180 }
181 
182 static int
showattr(int argc,char * argv[])183 showattr(int argc, char *argv[])
184 {
185 	struct ufs_extattr_fileheader uef;
186 	int i, fd;
187 	const char *bo;
188 
189 	if (argc != 1)
190 		usage();
191 
192 	fd = open(argv[0], O_RDONLY);
193 	if (fd == -1) {
194 		warn("open(%s)", argv[0]);
195 		return (-1);
196 	}
197 
198 	i = read(fd, &uef, sizeof(uef));
199 	if (i != sizeof(uef)) {
200 		warn("unable to read attribute file header");
201 		(void)close(fd);
202 		return (-1);
203 	}
204 
205 	if (rw32(uef.uef_magic) != UFS_EXTATTR_MAGIC) {
206 		needswap = 1;
207 		if (rw32(uef.uef_magic) != UFS_EXTATTR_MAGIC) {
208 			fprintf(stderr, "%s: bad magic\n", argv[0]);
209 			(void)close(fd);
210 			return (-1);
211 		}
212 	}
213 
214 #if BYTE_ORDER == LITTLE_ENDIAN
215 	bo = needswap ? "big-endian" : "little-endian";
216 #else
217 	bo = needswap ? "little-endian" : "big-endian";
218 #endif
219 
220 	printf("%s: version %u, size %u, byte-order: %s\n",
221 	    argv[0], rw32(uef.uef_version), rw32(uef.uef_size), bo);
222 
223 	close(fd);
224 	return (0);
225 }
226 
227 int
main(int argc,char * argv[])228 main(int argc, char *argv[])
229 {
230 	int error = 0, attrnamespace;
231 
232 	if (argc < 2)
233 		usage();
234 
235 	if (!strcmp(argv[1], "start")) {
236 		if (argc != 3)
237 			usage();
238 		error = extattrctl(argv[2], UFS_EXTATTR_CMD_START, NULL, 0,
239 		    NULL);
240 		if (error)
241 			err(1, "start");
242 	} else if (!strcmp(argv[1], "stop")) {
243 		if (argc != 3)
244 			usage();
245 		error = extattrctl(argv[2], UFS_EXTATTR_CMD_STOP, NULL, 0,
246 		   NULL);
247 		if (error)
248 			err(1, "stop");
249 	} else if (!strcmp(argv[1], "enable")) {
250 		if (argc != 6)
251 			usage();
252 		error = extattr_string_to_namespace(argv[3], &attrnamespace);
253 		if (error)
254 			errx(1, "bad namespace: %s", argv[3]);
255 		error = extattrctl(argv[2], UFS_EXTATTR_CMD_ENABLE, argv[5],
256 		    attrnamespace, argv[4]);
257 		if (error)
258 			err(1, "enable");
259 	} else if (!strcmp(argv[1], "disable")) {
260 		if (argc != 5)
261 			usage();
262 		error = extattr_string_to_namespace(argv[3], &attrnamespace);
263 		if (error)
264 			errx(1, "bad namespace: %s", argv[3]);
265 		error = extattrctl(argv[2], UFS_EXTATTR_CMD_DISABLE, NULL,
266 		    attrnamespace, argv[4]);
267 		if (error)
268 			err(1, "disable");
269 	} else if (!strcmp(argv[1], "initattr")) {
270 		argc -= 2;
271 		argv += 2;
272 		error = initattr(argc, argv);
273 		if (error)
274 			return (1);
275 	} else if (!strcmp(argv[1], "showattr")) {
276 		argc -= 2;
277 		argv += 2;
278 		error = showattr(argc, argv);
279 		if (error)
280 			return (1);
281 	} else
282 		usage();
283 
284 	return (0);
285 }
286