xref: /netbsd/usr.bin/extattr/getextattr.c (revision 778f5600)
1 /*	$NetBSD: getextattr.c,v 1.13 2022/04/07 19:33:38 andvar Exp $	*/
2 
3 /*-
4  * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
5  * Copyright (c) 2002 Poul-Henning Kamp.
6  * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
7  * All rights reserved.
8  *
9  * This software was developed for the FreeBSD Project by Poul-Henning
10  * Kamp and Network Associates Laboratories, the Security Research Division
11  * of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
12  * ("CBOSS"), as part of the DARPA CHATS research program
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  * 3. The names of the authors may not be used to endorse or promote
23  *    products derived from this software without specific prior written
24  *    permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
38  * FreeBSD: src/usr.sbin/extattr/rmextattr.c,v 1.6 2003/06/05 04:30:00 rwatson Exp
39  */
40 
41 #include <sys/types.h>
42 #include <sys/uio.h>
43 #include <sys/extattr.h>
44 
45 #include <err.h>
46 #include <errno.h>
47 //#include <libgen.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <vis.h>
53 #include <fcntl.h>
54 #include <sys/stat.h>
55 //#include <util.h>
56 
57 static enum { EADUNNO, EAGET, EASET, EARM, EALS } what = EADUNNO;
58 
59 __dead static void
usage(void)60 usage(void)
61 {
62 
63 	switch (what) {
64 	case EAGET:
65 		fprintf(stderr, "usage: %s [-fhq] [-s | -x | -v style] "
66 		    "attrnamespace attrname filename ...\n", getprogname());
67 		exit(1);
68 
69 	case EASET:
70 		fprintf(stderr, "usage: %s [-fhnq] "
71 		    "attrnamespace attrname attrvalue filename ...\n",
72 		    getprogname());
73 		fprintf(stderr, "usage: %s [-fhnq] -i attrvalue_file "
74 		    "attrnamespace attrname filename ...\n",
75 		    getprogname());
76 		exit(1);
77 
78 	case EARM:
79 		fprintf(stderr, "usage: %s [-fhq] "
80 		    "attrnamespace attrname filename ...\n", getprogname());
81 		exit(1);
82 
83 	case EALS:
84 		fprintf(stderr, "usage: %s [-fhq] "
85 		    "attrnamespace filename ...\n", getprogname());
86 		exit(1);
87 
88 	case EADUNNO:
89 	default:
90 		fprintf(stderr,
91 		    "usage: (getextattr|lsextattr|rmextattr|setextattr)\n");
92 		exit (1);
93 	}
94 }
95 
96 static void
mkbuf(char ** buf,int * oldlen,int newlen)97 mkbuf(char **buf, int *oldlen, int newlen)
98 {
99 
100 	if (*oldlen >= newlen)
101 		return;
102 	if (*buf != NULL)
103 		free(*buf);
104 	*buf = malloc(newlen);
105 	if (*buf == NULL)
106 		err(1, "malloc");
107 	*oldlen = newlen;
108 	return;
109 }
110 
111 static int
parse_flag_vis(const char * opt)112 parse_flag_vis(const char *opt)
113 {
114 	if (strcmp(opt, "default") == 0)
115 		return 0;
116 	else if (strcmp(opt, "cstyle") == 0)
117 		return VIS_CSTYLE;
118 	else if (strcmp(opt, "octal") == 0)
119 		return VIS_OCTAL;
120 	else if (strcmp(opt, "httpstyle") == 0)
121 		return VIS_HTTPSTYLE;
122 
123 	/* Convenient aliases */
124 	else if (strcmp(opt, "vis") == 0)
125 		return 0;
126 	else if (strcmp(opt, "c") == 0)
127 		return VIS_CSTYLE;
128 	else if (strcmp(opt, "http") == 0)
129 		return VIS_HTTPSTYLE;
130 	else
131 		fprintf(stderr, "%s: invalid -s option \"%s\"",
132 			getprogname(), opt);
133 
134 	return -1;
135 }
136 
137 #define HEXDUMP_PRINT(x) ((uint8_t)x >= 32 && (uint8_t)x < 128)  ? x : '.'
138 static void
hexdump(const char * addr,size_t len)139 hexdump(const char *addr, size_t len)
140 {
141 	unsigned int i, j;
142 
143 	for (i = 0; i < len; i += 16) {
144 		printf("   %03x   ", i);
145 		for (j = 0; j < 16; j++) {
146 			if (i + j >= len)
147 				printf("   ");
148 			else
149 				printf("%02x ", addr[i + j] & 0xff);
150 		}
151 		printf("   ");
152 		for (j = 0; j < 16; j++) {
153 			if (i + j >= len)
154 				printf(" ");
155 			else
156 				printf("%c", HEXDUMP_PRINT(addr[i + j]));
157 		}
158 		printf("\n");
159 	}
160 }
161 #undef HEXDUMP_PRINT
162 
163 int
main(int argc,char * argv[])164 main(int argc, char *argv[])
165 {
166 	char	*buf, *visbuf;
167 	const char *p;
168 
169 	const char *options, *attrname;
170 	int	 buflen, visbuflen, ch, error, i, arg_counter, attrnamespace,
171 		 minargc, val_len = 0;
172 
173 	int	flag_force = 0;
174 	int	flag_nofollow = 0;
175 	int	flag_null = 0;
176 	int	flag_quiet = 0;
177 	int	flag_vis = -1;
178 	int	flag_hex = 0;
179 	char	*filename = NULL;
180 
181 	options = NULL;
182 	minargc = 0;
183 	visbuflen = buflen = 0;
184 	visbuf = buf = NULL;
185 
186 	p = getprogname();
187 	if (strcmp(p, "getextattr") == 0) {
188 		what = EAGET;
189 		options = "fhqsxv:";
190 		minargc = 2;
191 	} else if (strcmp(p, "setextattr") == 0) {
192 		what = EASET;
193 		options = "fhnqi:";
194 		minargc = 3;
195 	} else if (strcmp(p, "rmextattr") == 0) {
196 		what = EARM;
197 		options = "fhq";
198 		minargc = 2;
199 	} else if (strcmp(p, "lsextattr") == 0) {
200 		what = EALS;
201 		options = "fhq";
202 		minargc = 2;
203 	} else
204 		usage();
205 
206 	while ((ch = getopt(argc, argv, options)) != -1) {
207 		switch (ch) {
208 		case 'f':
209 			flag_force = 1;
210 			break;
211 		case 'h':
212 			flag_nofollow = 1;
213 			break;
214 		case 'n':
215 			flag_null = 1;
216 			break;
217 		case 'q':
218 			flag_quiet = 1;
219 			break;
220 		case 's':
221 			flag_vis = VIS_SAFE | VIS_WHITE;
222 			break;
223 		case 'v':
224 			flag_vis = parse_flag_vis(optarg);
225 			break;
226 		case 'x':
227 			flag_hex = 1;
228 			break;
229 		case 'i':
230 			filename = optarg;
231 			minargc--;
232 			break;
233 		default:
234 			usage();
235 		}
236 	}
237 
238 	argc -= optind;
239 	argv += optind;
240 
241 	/*
242 	 * Check for missing argument.
243 	 */
244 	if (argc < minargc)
245 		usage();
246 
247 	/*
248 	 * Normal case "namespace attribute".
249 	 */
250 	error = extattr_string_to_namespace(argv[0], &attrnamespace);
251 	if (error == 0) {
252 		/*
253 		 * Namespace was specified, so we need one more argument
254 		 * for the attribute (except for listing)
255 		 */
256 		if ((what != EALS) && (argc < minargc + 1))
257 			usage();
258 		argc--; argv++;
259 	} else {
260 		/*
261 		 * The namespace was not valid. Perhaps it was omitted.
262 		 * Try to guess a missing namespace by using
263 		 * linux layout "namespace.attribute". While
264 		 * we are here, also test the Linux namespaces.
265 		 */
266 		if (strstr(argv[0], "user.") == argv[0]) {
267 			attrnamespace = EXTATTR_NAMESPACE_USER;
268 		} else
269 		if ((strstr(argv[0], "system.") == argv[0]) ||
270 		    (strstr(argv[0], "trusted.") == argv[0]) ||
271 		    (strstr(argv[0], "security.") == argv[0])) {
272 			attrnamespace = EXTATTR_NAMESPACE_SYSTEM;
273 		} else {
274 			err(1, "%s", argv[0]);
275 		}
276 	}
277 
278 
279 	if (what != EALS) {
280 		attrname = argv[0];
281 		argc--; argv++;
282 	} else
283 		attrname = NULL;
284 
285 	if (what == EASET) {
286 		/*
287 		 * Handle -i option, reading value from a file.
288 		 */
289 		if (filename != NULL) {
290 			int fd;
291 			struct stat st;
292 			ssize_t readen, remain;
293 
294 			if ((fd = open(filename, O_RDONLY, 0)) == -1)
295 				err(1, "%s: cannot open \"%s\"",
296 				     getprogname(), filename);
297 
298 			if (fstat(fd, &st) != 0)
299 				err(1, "%s: cannot stat \"%s\"",
300 				     getprogname(), filename);
301 
302 			val_len = st.st_size;
303 			mkbuf(&buf, &buflen, val_len);
304 
305 			for (remain = val_len; remain > 0; remain -= readen) {
306 				if ((readen = read(fd, buf, remain)) == -1)
307 					err(1, "%s: cannot read \"%s\"",
308 					    getprogname(), filename);
309 			}
310 
311 			(void)close(fd);
312 		} else {
313 			val_len = strlen(argv[0]);
314 			mkbuf(&buf, &buflen, val_len + 1);
315 			strcpy(buf, argv[0]); /* safe */
316 			argc--; argv++;
317 		}
318 	}
319 
320 	for (arg_counter = 0; arg_counter < argc; arg_counter++) {
321 		switch (what) {
322 		case EARM:
323 			if (flag_nofollow)
324 				error = extattr_delete_link(argv[arg_counter],
325 				    attrnamespace, attrname);
326 			else
327 				error = extattr_delete_file(argv[arg_counter],
328 				    attrnamespace, attrname);
329 			if (error >= 0)
330 				continue;
331 			break;
332 		case EASET:
333 			if (flag_nofollow)
334 				error = extattr_set_link(argv[arg_counter],
335 				    attrnamespace, attrname, buf,
336 				    val_len + flag_null);
337 			else
338 				error = extattr_set_file(argv[arg_counter],
339 				    attrnamespace, attrname, buf,
340 				    val_len + flag_null);
341 			if (error >= 0)
342 				continue;
343 			break;
344 		case EALS:
345 			if (flag_nofollow)
346 				error = extattr_list_link(argv[arg_counter],
347 				    attrnamespace, NULL, 0);
348 			else
349 				error = extattr_list_file(argv[arg_counter],
350 				    attrnamespace, NULL, 0);
351 			if (error < 0)
352 				break;
353 			mkbuf(&buf, &buflen, error);
354 			if (flag_nofollow)
355 				error = extattr_list_link(argv[arg_counter],
356 				    attrnamespace, buf, buflen);
357 			else
358 				error = extattr_list_file(argv[arg_counter],
359 				    attrnamespace, buf, buflen);
360 			if (error < 0)
361 				break;
362 			if (!flag_quiet)
363 				printf("%s\t", argv[arg_counter]);
364 			for (i = 0; i < error; i += buf[i] + 1)
365 			    printf("%s%*.*s", i ? "\t" : "",
366 				buf[i], buf[i], buf + i + 1);
367 			printf("\n");
368 			continue;
369 		case EAGET:
370 			if (flag_nofollow)
371 				error = extattr_get_link(argv[arg_counter],
372 				    attrnamespace, attrname, NULL, 0);
373 			else
374 				error = extattr_get_file(argv[arg_counter],
375 				    attrnamespace, attrname, NULL, 0);
376 			if (error < 0)
377 				break;
378 			mkbuf(&buf, &buflen, error);
379 			if (flag_nofollow)
380 				error = extattr_get_link(argv[arg_counter],
381 				    attrnamespace, attrname, buf, buflen);
382 			else
383 				error = extattr_get_file(argv[arg_counter],
384 				    attrnamespace, attrname, buf, buflen);
385 			if (error < 0)
386 				break;
387 			if (!flag_quiet)
388 				printf("%s\t", argv[arg_counter]);
389 
390 			/*
391 			 * Check for binary string and terminal output
392 			 */
393 #if 0
394 			for (i = 0; i < error; i++)
395 				if (!isprint((int)buf[i]))
396 					err(1, "binary data, use -x flag");
397 #endif
398 
399 			if (flag_vis != -1) {
400 				mkbuf(&visbuf, &visbuflen, error * 4 + 1);
401 				strvisx(visbuf, buf, error, flag_vis);
402 				printf("\"%s\"\n", visbuf);
403 				continue;
404 			} else if (flag_hex) {
405 				printf("\n");
406 				hexdump(buf, error);
407 				continue;
408 			} else {
409 				fwrite(buf, error, 1, stdout);
410 				printf("\n");
411 				continue;
412 			}
413 		default:
414 			break;
415 		}
416 		if (!flag_quiet)
417 			warn("%s: failed", argv[arg_counter]);
418 		if (flag_force)
419 			continue;
420 		return(1);
421 	}
422 	return (0);
423 }
424