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