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1 /*
2 * namedev_parse.c
3 *
4 * Userspace devfs
5 *
6 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
7 *
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 */
23
24 #ifdef DEBUG
25 /* define this to enable parsing debugging also */
26 /* #define DEBUG_PARSER */
27 #endif
28
29 #include <stddef.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdio.h>
33 #include <ctype.h>
34 #include <unistd.h>
35 #include <sys/stat.h>
36 #include <errno.h>
37
38 #include "udev.h"
39 #include "udev_lib.h"
40 #include "logging.h"
41 #include "namedev.h"
42
43
44 static int add_config_dev(struct config_device *new_dev)
45 {
46 struct config_device *tmp_dev;
47
48 tmp_dev = malloc(sizeof(*tmp_dev));
49 if (tmp_dev == NULL)
50 return -ENOMEM;
51 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
52 list_add_tail(&tmp_dev->node, &config_device_list);
53 //dump_config_dev(tmp_dev);
54 return 0;
55 }
56
57 void dump_config_dev(struct config_device *dev)
58 {
59 dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
60 "sysfs_file[0]='%s', sysfs_value[0]='%s', "
61 "kernel='%s', program='%s', result='%s'"
62 "owner='%s', group='%s', mode=%#o",
63 dev->name, dev->symlink, dev->bus, dev->place, dev->id,
64 dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
65 dev->kernel, dev->program, dev->result,
66 dev->owner, dev->group, dev->mode);
67 }
68
69 void dump_config_dev_list(void)
70 {
71 struct config_device *dev;
72
73 list_for_each_entry(dev, &config_device_list, node)
74 dump_config_dev(dev);
75 }
76
77 static int add_perm_dev(struct perm_device *new_dev)
78 {
79 struct perm_device *dev;
80 struct perm_device *tmp_dev;
81
82 /* update the values if we already have the device */
83 list_for_each_entry(dev, &perm_device_list, node) {
84 if (strcmp(new_dev->name, dev->name) != 0)
85 continue;
86
87 set_empty_perms(dev, new_dev->mode, new_dev->owner, new_dev->group);
88 return 0;
89 }
90
91 /* not found, add new structure to the perm list */
92 tmp_dev = malloc(sizeof(*tmp_dev));
93 if (!tmp_dev)
94 return -ENOMEM;
95
96 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
97 list_add_tail(&tmp_dev->node, &perm_device_list);
98 //dump_perm_dev(tmp_dev);
99 return 0;
100 }
101
102 void dump_perm_dev(struct perm_device *dev)
103 {
104 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
105 dev->name, dev->owner, dev->group, dev->mode);
106 }
107
108 void dump_perm_dev_list(void)
109 {
110 struct perm_device *dev;
111
112 list_for_each_entry(dev, &perm_device_list, node)
113 dump_perm_dev(dev);
114 }
115
116 /* extract possible KEY{attr} or KEY_attr */
117 static char *get_key_attribute(char *str)
118 {
119 char *pos;
120 char *attr;
121
122 attr = strchr(str, '{');
123 if (attr != NULL) {
124 attr++;
125 pos = strchr(attr, '}');
126 if (pos == NULL) {
127 dbg("missing closing brace for format");
128 return NULL;
129 }
130 pos[0] = '\0';
131 dbg("attribute='%s'", attr);
132 return attr;
133 }
134
135 attr = strchr(str, '_');
136 if (attr != NULL) {
137 attr++;
138 dbg("attribute='%s'", attr);
139 return attr;
140 }
141
142 return NULL;
143 }
144
145 static int namedev_parse_rules(char *filename)
146 {
147 char line[LINE_SIZE];
148 char *bufline;
149 int lineno;
150 char *temp;
151 char *temp2;
152 char *temp3;
153 char *attr;
154 char *buf;
155 size_t bufsize;
156 size_t cur;
157 size_t count;
158 int program_given = 0;
159 int valid;
160 int retval = 0;
161 struct config_device dev;
162
163 if (file_map(filename, &buf, &bufsize) == 0) {
164 dbg("reading '%s' as rules file", filename);
165 } else {
166 dbg("can't open '%s' as rules file", filename);
167 return -1;
168 }
169
170 /* loop through the whole file */
171 cur = 0;
172 lineno = 0;
173 while (cur < bufsize) {
174 count = buf_get_line(buf, bufsize, cur);
175 bufline = &buf[cur];
176 cur += count+1;
177 lineno++;
178
179 if (count >= LINE_SIZE) {
180 info("line too long, rule skipped %s, line %d",
181 filename, lineno);
182 continue;
183 }
184
185 /* eat the whitespace */
186 while ((count > 0) && isspace(bufline[0])) {
187 bufline++;
188 count--;
189 }
190 if (count == 0)
191 continue;
192
193 /* see if this is a comment */
194 if (bufline[0] == COMMENT_CHARACTER)
195 continue;
196
197 strncpy(line, bufline, count);
198 line[count] = '\0';
199 dbg_parse("read '%s'", line);
200
201 /* get all known keys */
202 memset(&dev, 0x00, sizeof(struct config_device));
203 temp = line;
204 valid = 0;
205
206 while (1) {
207 retval = parse_get_pair(&temp, &temp2, &temp3);
208 if (retval)
209 break;
210
211 if (strcasecmp(temp2, FIELD_BUS) == 0) {
212 strfieldcpy(dev.bus, temp3);
213 valid = 1;
214 continue;
215 }
216
217 if (strcasecmp(temp2, FIELD_ID) == 0) {
218 strfieldcpy(dev.id, temp3);
219 valid = 1;
220 continue;
221 }
222
223 if (strcasecmp(temp2, FIELD_PLACE) == 0) {
224 strfieldcpy(dev.place, temp3);
225 valid = 1;
226 continue;
227 }
228
229 if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
230 struct sysfs_pair *pair = &dev.sysfs_pair[0];
231 int sysfs_pair_num = 0;
232
233 /* find first unused pair */
234 while (pair->file[0] != '\0') {
235 ++sysfs_pair_num;
236 if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
237 pair = NULL;
238 break;
239 }
240 ++pair;
241 }
242 if (pair) {
243 attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
244 if (attr == NULL) {
245 dbg("error parsing " FIELD_SYSFS " attribute");
246 continue;
247 }
248 strfieldcpy(pair->file, attr);
249 strfieldcpy(pair->value, temp3);
250 valid = 1;
251 }
252 continue;
253 }
254
255 if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
256 strfieldcpy(dev.kernel, temp3);
257 valid = 1;
258 continue;
259 }
260
261 if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
262 program_given = 1;
263 strfieldcpy(dev.program, temp3);
264 valid = 1;
265 continue;
266 }
267
268 if (strcasecmp(temp2, FIELD_RESULT) == 0) {
269 strfieldcpy(dev.result, temp3);
270 valid = 1;
271 continue;
272 }
273
274 if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
275 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
276 if (attr != NULL && strcasecmp(attr, ATTR_PARTITIONS) == 0) {
277 dbg_parse("creation of partition nodes requested");
278 dev.partitions = PARTITIONS_COUNT;
279 }
280 strfieldcpy(dev.name, temp3);
281 valid = 1;
282 continue;
283 }
284
285 if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
286 strfieldcpy(dev.symlink, temp3);
287 valid = 1;
288 continue;
289 }
290
291 if (strcasecmp(temp2, FIELD_OWNER) == 0) {
292 strfieldcpy(dev.owner, temp3);
293 valid = 1;
294 continue;
295 }
296
297 if (strcasecmp(temp2, FIELD_GROUP) == 0) {
298 strfieldcpy(dev.group, temp3);
299 valid = 1;
300 continue;
301 }
302
303 if (strcasecmp(temp2, FIELD_MODE) == 0) {
304 dev.mode = strtol(temp3, NULL, 8);
305 valid = 1;
306 continue;
307 }
308
309 dbg("unknown type of field '%s'", temp2);
310 goto error;
311 }
312
313 /* skip line if not any valid key was found */
314 if (!valid)
315 goto error;
316
317 /* simple plausibility checks for given keys */
318 if ((dev.sysfs_pair[0].file[0] == '\0') ^
319 (dev.sysfs_pair[0].value[0] == '\0')) {
320 info("inconsistency in " FIELD_SYSFS " key");
321 goto error;
322 }
323
324 if ((dev.result[0] != '\0') && (program_given == 0)) {
325 info(FIELD_RESULT " is only useful when "
326 FIELD_PROGRAM " is called in any rule before");
327 goto error;
328 }
329
330 dev.config_line = lineno;
331 strfieldcpy(dev.config_file, filename);
332 retval = add_config_dev(&dev);
333 if (retval) {
334 dbg("add_config_dev returned with error %d", retval);
335 continue;
336 error:
337 info("parse error %s, line %d:%d, rule skipped",
338 filename, lineno, temp - line);
339 }
340 }
341
342 file_unmap(buf, bufsize);
343 return retval;
344 }
345
346 static int namedev_parse_permissions(char *filename)
347 {
348 char line[LINE_SIZE];
349 char *bufline;
350 char *temp;
351 char *temp2;
352 char *buf;
353 size_t bufsize;
354 size_t cur;
355 size_t count;
356 int retval = 0;
357 struct perm_device dev;
358 int lineno;
359
360 if (file_map(filename, &buf, &bufsize) == 0) {
361 dbg("reading '%s' as permissions file", filename);
362 } else {
363 dbg("can't open '%s' as permissions file", filename);
364 return -1;
365 }
366
367 /* loop through the whole file */
368 cur = 0;
369 lineno = 0;
370 while (cur < bufsize) {
371 count = buf_get_line(buf, bufsize, cur);
372 bufline = &buf[cur];
373 cur += count+1;
374 lineno++;
375
376 if (count >= LINE_SIZE) {
377 info("line too long, rule skipped %s, line %d",
378 filename, lineno);
379 continue;
380 }
381
382 /* eat the whitespace */
383 while ((count > 0) && isspace(bufline[0])) {
384 bufline++;
385 count--;
386 }
387 if (count == 0)
388 continue;
389
390 /* see if this is a comment */
391 if (bufline[0] == COMMENT_CHARACTER)
392 continue;
393
394 strncpy(line, bufline, count);
395 line[count] = '\0';
396 dbg_parse("read '%s'", line);
397
398 /* parse the line */
399 memset(&dev, 0x00, sizeof(struct perm_device));
400 temp = line;
401
402 temp2 = strsep(&temp, ":");
403 if (!temp2) {
404 dbg("cannot parse line '%s'", line);
405 continue;
406 }
407 strfieldcpy(dev.name, temp2);
408
409 temp2 = strsep(&temp, ":");
410 if (!temp2) {
411 dbg("cannot parse line '%s'", line);
412 continue;
413 }
414 strfieldcpy(dev.owner, temp2);
415
416 temp2 = strsep(&temp, ":");
417 if (!temp2) {
418 dbg("cannot parse line '%s'", line);
419 continue;
420 }
421 strfieldcpy(dev.group, temp2);
422
423 if (!temp) {
424 dbg("cannot parse line '%s'", line);
425 continue;
426 }
427 dev.mode = strtol(temp, NULL, 8);
428
429 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
430 dev.name, dev.owner, dev.group, dev.mode);
431
432 retval = add_perm_dev(&dev);
433 if (retval) {
434 dbg("add_perm_dev returned with error %d", retval);
435 goto exit;
436 }
437 }
438
439 exit:
440 file_unmap(buf, bufsize);
441 return retval;
442 }
443
444 int namedev_init_rules(void)
445 {
446 struct stat stats;
447
448 stat(udev_rules_filename, &stats);
449 if ((stats.st_mode & S_IFMT) != S_IFDIR)
450 return namedev_parse_rules(udev_rules_filename);
451 else
452 return call_foreach_file(namedev_parse_rules,
453 udev_rules_filename, RULEFILE_SUFFIX);
454 }
455
456 int namedev_init_permissions(void)
457 {
458 struct stat stats;
459
460 stat(udev_permissions_filename, &stats);
461 if ((stats.st_mode & S_IFMT) != S_IFDIR)
462 return namedev_parse_permissions(udev_permissions_filename);
463 else
464 return call_foreach_file(namedev_parse_permissions,
465 udev_permissions_filename, PERMFILE_SUFFIX);
466 }