chiark / gitweb /
[PATCH] Exit, if udevtest cannot open the device (segfault).
[elogind.git] / namedev_parse.c
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 }