chiark / gitweb /
[PATCH] fix a few stale comments in namedev.c
[elogind.git] / namedev.c
1 /*
2  * namedev.c
3  *
4  * Userspace devfs
5  *
6  * Copyright (C) 2003 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 #include <stddef.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <stdio.h>
28 #include <fcntl.h>
29 #include <ctype.h>
30 #include <unistd.h>
31 #include <errno.h>
32 #include <sys/wait.h>
33 #include <sys/stat.h>
34
35 #include "list.h"
36 #include "udev.h"
37 #include "udev_version.h"
38 #include "namedev.h"
39 #include "libsysfs/libsysfs.h"
40 #include "klibc_fixups.h"
41
42 LIST_HEAD(config_device_list);
43 LIST_HEAD(perm_device_list);
44
45 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
46 static int strcmp_pattern(const char *p, const char *s)
47 {
48         if (*s == '\0') {
49                 while (*p == '*')
50                         p++;
51                 return (*p != '\0');
52         }
53         switch (*p) {
54         case '[':
55                 {
56                         int not = 0;
57                         p++;
58                         if (*p == '!') {
59                                 not = 1;
60                                 p++;
61                         }
62                         while (*p && (*p != ']')) {
63                                 int match = 0;
64                                 if (p[1] == '-') {
65                                         if ((*s >= *p) && (*s <= p[2]))
66                                                 match = 1;
67                                         p += 3;
68                                 } else {
69                                         match = (*p == *s);
70                                         p++;
71                                 }
72                                 if (match ^ not) {
73                                         while (*p && (*p != ']'))
74                                                 p++;
75                                         return strcmp_pattern(p+1, s+1);
76                                 }
77                         }
78                 }
79                 break;
80         case '*':
81                 if (strcmp_pattern(p, s+1))
82                         return strcmp_pattern(p+1, s);
83                 return 0;
84         case '\0':
85                 if (*s == '\0') {
86                         return 0;
87                 }
88                 break;
89         default:
90                 if ((*p == *s) || (*p == '?'))
91                         return strcmp_pattern(p+1, s+1);
92                 break;
93         }
94         return 1;
95 }
96
97 #define copy_var(a, b, var)             \
98         if (b->var)                     \
99                 a->var = b->var;
100
101 #define copy_string(a, b, var)          \
102         if (strlen(b->var))             \
103                 strcpy(a->var, b->var);
104
105 int add_perm_dev(struct perm_device *new_dev)
106 {
107         struct perm_device *dev;
108         struct perm_device *tmp_dev;
109
110         /* update the values if we already have the device */
111         list_for_each_entry(dev, &perm_device_list, node) {
112                 if (strcmp_pattern(new_dev->name, dev->name))
113                         continue;
114                 copy_var(dev, new_dev, mode);
115                 copy_string(dev, new_dev, owner);
116                 copy_string(dev, new_dev, group);
117                 return 0;
118         }
119
120         /* not found, add new structure to the perm list */
121         tmp_dev = malloc(sizeof(*tmp_dev));
122         if (!tmp_dev)
123                 return -ENOMEM;
124         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
125         list_add_tail(&tmp_dev->node, &perm_device_list);
126         //dump_perm_dev(tmp_dev);
127         return 0;
128 }
129
130 static struct perm_device *find_perm(char *name)
131 {
132         struct perm_device *perm;
133
134         list_for_each_entry(perm, &perm_device_list, node) {
135                 if (strcmp_pattern(perm->name, name))
136                         continue;
137                 return perm;
138         }
139         return NULL;
140 }
141
142 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
143 {
144         mode_t mode = 0600;     /* default to owner rw only */
145
146         if (strlen(default_mode_str) != 0) {
147                 mode = strtol(default_mode_str, NULL, 8);
148         }
149         return mode;
150 }
151
152 static void apply_format(struct udevice *udev, unsigned char *string)
153 {
154         char name[NAME_SIZE];
155         char temp[NAME_SIZE];
156         char *tail;
157         char *pos;
158         char *pos2;
159         char *pos3;
160         int num;
161
162         while (1) {
163                 num = 0;
164                 pos = strchr(string, '%');
165
166                 if (pos) {
167                         *pos = '\0';
168                         tail = pos+1;
169                         if (isdigit(tail[0])) {
170                                 num = (int) strtoul(&pos[1], &tail, 10);
171                                 if (tail == NULL) {
172                                         dbg("format parsing error '%s'", pos+1);
173                                         break;
174                                 }
175                         }
176                         strfieldcpy(name, tail+1);
177
178                         switch (tail[0]) {
179                         case 'b':
180                                 if (strlen(udev->bus_id) == 0)
181                                         break;
182                                 strcat(pos, udev->bus_id);
183                                 dbg("substitute bus_id '%s'", udev->bus_id);
184                                 break;
185                         case 'k':
186                                 if (strlen(udev->kernel_name) == 0)
187                                         break;
188                                 strcat(pos, udev->kernel_name);
189                                 dbg("substitute kernel name '%s'", udev->kernel_name);
190                                 break;
191                         case 'n':
192                                 if (strlen(udev->kernel_number) == 0)
193                                         break;
194                                 strcat(pos, udev->kernel_number);
195                                 dbg("substitute kernel number '%s'", udev->kernel_number);
196                                 break;
197                         case 'D':
198                                 if (strlen(udev->kernel_number) == 0) {
199                                         strcat(pos, "disc");
200                                         dbg("substitute devfs disc");
201                                         break;
202                                 }
203                                 strcat(pos, "part");
204                                 strcat(pos, udev->kernel_number);
205                                 dbg("substitute devfs part '%s'", udev->kernel_number);
206                                 break;
207                         case 'm':
208                                 sprintf(pos, "%u", udev->minor);
209                                 dbg("substitute minor number '%u'", udev->minor);
210                                 break;
211                         case 'M':
212                                 sprintf(pos, "%u", udev->major);
213                                 dbg("substitute major number '%u'", udev->major);
214                                 break;
215                         case 'c':
216                                 if (strlen(udev->program_result) == 0)
217                                         break;
218                                 if (num) {
219                                         /* get part of return string */
220                                         strncpy(temp, udev->program_result, sizeof(temp));
221                                         pos2 = temp;
222                                         while (num) {
223                                                 num--;
224                                                 pos3 = strsep(&pos2, " ");
225                                                 if (pos3 == NULL) {
226                                                         dbg("requested part of result string not found");
227                                                         break;
228                                                 }
229                                         }
230                                         if (pos3) {
231                                                 strcat(pos, pos3);
232                                                 dbg("substitute part of result string '%s'", pos3);
233                                         }
234                                 } else {
235                                         strcat(pos, udev->program_result);
236                                         dbg("substitute result string '%s'", udev->program_result);
237                                 }
238                                 break;
239                         default:
240                                 dbg("unknown substitution type '%%%c'", pos[1]);
241                                 break;
242                         }
243                         strcat(string, name);
244                 } else
245                         break;
246         }
247 }
248
249 static struct bus_file {
250         char *bus;
251         char *file;
252 } bus_files[] = {
253         { .bus = "scsi",        .file = "vendor" },
254         { .bus = "usb",         .file = "idVendor" },
255         { .bus = "usb-serial",  .file = "detach_state" },
256         { .bus = "ide",         .file = "detach_state" },
257         { .bus = "pci",         .file = "vendor" },
258         {}
259 };
260
261 #define SECONDS_TO_WAIT_FOR_FILE        10
262 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
263 {
264         /* sleep until we see the file for this specific bus type show up this
265          * is needed because we can easily out-run the kernel in looking for
266          * these files before the paticular subsystem has created them in the
267          * sysfs tree properly.
268          *
269          * And people thought that the /sbin/hotplug event system was going to
270          * be slow, poo on you for arguing that before even testing it...
271          */
272         struct bus_file *b = &bus_files[0];
273         struct sysfs_attribute *tmpattr;
274         int loop;
275
276         while (1) {
277                 if (b->bus == NULL)
278                         break;
279                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
280                         tmpattr = NULL;
281                         loop = SECONDS_TO_WAIT_FOR_FILE;
282                         while (loop--) {
283                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
284                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
285                                 if (tmpattr) {
286                                         /* found it! */
287                                         goto exit;
288                                 }
289                                 /* sleep to give the kernel a chance to create the file */
290                                 sleep(1);
291                         }
292                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
293                         goto exit;
294                 }
295                 b++;
296         }
297         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
298 exit:
299         return; /* here to prevent compiler warning... */
300 }
301
302 static int execute_program(char *path, char *value, int len)
303 {
304         int retval;
305         int res;
306         int status;
307         int fds[2];
308         pid_t pid;
309         int value_set = 0;
310         char buffer[256];
311         char *pos;
312         char *args[CALLOUT_MAXARG];
313         int i;
314
315         dbg("executing '%s'", path);
316         retval = pipe(fds);
317         if (retval != 0) {
318                 dbg("pipe failed");
319                 return -1;
320         }
321         pid = fork();
322         if (pid == -1) {
323                 dbg("fork failed");
324                 return -1;
325         }
326
327         if (pid == 0) {
328                 /* child */
329                 close(STDOUT_FILENO);
330                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
331                 if (strchr(path, ' ')) {
332                         /* exec with arguments */
333                         pos = path;
334                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
335                                 args[i] = strsep(&pos, " ");
336                                 if (args[i] == NULL)
337                                         break;
338                         }
339                         if (args[i]) {
340                                 dbg("too many args - %d", i);
341                                 args[i] = NULL;
342                         }
343                         retval = execve(args[0], args, main_envp);
344                 } else {
345                         retval = execve(path, main_argv, main_envp);
346                 }
347                 if (retval != 0) {
348                         dbg("child execve failed");
349                         exit(1);
350                 }
351                 return -1; /* avoid compiler warning */
352         } else {
353                 /* parent reads from fds[0] */
354                 close(fds[1]);
355                 retval = 0;
356                 while (1) {
357                         res = read(fds[0], buffer, sizeof(buffer) - 1);
358                         if (res <= 0)
359                                 break;
360                         buffer[res] = '\0';
361                         if (res > len) {
362                                 dbg("result len %d too short", len);
363                                 retval = -1;
364                         }
365                         if (value_set) {
366                                 dbg("result value already set");
367                                 retval = -1;
368                         } else {
369                                 value_set = 1;
370                                 strncpy(value, buffer, len);
371                                 pos = value + strlen(value)-1;
372                                 if (pos[0] == '\n')
373                                 pos[0] = '\0';
374                                 dbg("result is '%s'", value);
375                         }
376                 }
377                 close(fds[0]);
378                 res = wait(&status);
379                 if (res < 0) {
380                         dbg("wait failed result %d", res);
381                         retval = -1;
382                 }
383
384                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
385                         dbg("exec program status 0x%x", status);
386                         retval = -1;
387                 }
388         }
389         return retval;
390 }
391
392 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
393 {
394         struct sysfs_attribute *tmpattr = NULL;
395         char *c;
396
397         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
398                 return -ENODEV;
399
400         dbg("look for device attribute '%s'", pair->file);
401         /* try to find the attribute in the class device directory */
402         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
403         if (tmpattr)
404                 goto label_found;
405
406         /* look in the class device directory if present */
407         if (sysfs_device) {
408                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
409                 if (tmpattr)
410                         goto label_found;
411         }
412         return -ENODEV;
413
414 label_found:
415         c = tmpattr->value + strlen(tmpattr->value)-1;
416         if (*c == '\n')
417                 *c = 0x00;
418         dbg("compare attribute '%s' value '%s' with '%s'",
419                   pair->file, tmpattr->value, pair->value);
420         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
421                 return -ENODEV;
422
423         dbg("found matching attribute '%s' with value '%s'",
424             pair->file, pair->value);
425         return 0;
426 }
427
428 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
429 {
430         struct sysfs_pair *pair;
431         int i;
432
433         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
434                 pair = &dev->sysfs_pair[i];
435                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
436                         break;
437                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
438                         dbg("sysfs attribute doesn't match");
439                         return -ENODEV;
440                 }
441         }
442
443         return 0;
444 }
445
446 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
447 {
448         char path[SYSFS_PATH_MAX];
449         int found;
450         char *temp = NULL;
451
452         /* we have to have a sysfs device for ID to work */
453         if (!sysfs_device)
454                 return -ENODEV;
455
456         found = 0;
457         strfieldcpy(path, sysfs_device->path);
458         temp = strrchr(path, '/');
459         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
460         if (strstr(temp, dev->id) != NULL) {
461                 found = 1;
462         } else {
463                 *temp = 0x00;
464                 temp = strrchr(path, '/');
465                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
466                 if (strstr(temp, dev->id) != NULL)
467                         found = 1;
468         }
469         if (!found) {
470                 dbg("id doesn't match");
471                 return -ENODEV;
472         }
473
474         return 0;
475 }
476
477 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
478 {
479         char path[SYSFS_PATH_MAX];
480         int found;
481         char *temp = NULL;
482
483         /* we have to have a sysfs device for PLACE to work */
484         if (!sysfs_device)
485                 return -ENODEV;
486
487         found = 0;
488         strfieldcpy(path, sysfs_device->path);
489         temp = strrchr(path, '/');
490         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
491         if (strstr(temp, dev->place) != NULL) {
492                 found = 1;
493         } else {
494                 *temp = 0x00;
495                 temp = strrchr(path, '/');
496                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
497                 if (strstr(temp, dev->place) != NULL)
498                         found = 1;
499         }
500         if (!found) {
501                 dbg("place doesn't match");
502                 return -ENODEV;
503         }
504
505         return 0;
506 }
507
508 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
509 {
510         struct sysfs_device *sysfs_device;
511         struct sysfs_class_device *class_dev_parent;
512         int loop;
513         char filename[SYSFS_PATH_MAX + 6];
514         int retval;
515         char *temp;
516         int partition = 0;
517
518         /* Figure out where the device symlink is at.  For char devices this will
519          * always be in the class_dev->path.  But for block devices, it's different.
520          * The main block device will have the device symlink in it's path, but
521          * all partitions have the symlink in its parent directory.
522          * But we need to watch out for block devices that do not have parents, yet
523          * look like a partition (fd0, loop0, etc.)  They all do not have a device
524          * symlink yet.  We do sit and spin on waiting for them right now, we should
525          * possibly have a whitelist for these devices here...
526          */
527         strcpy(filename, class_dev->path);
528         dbg("filename = %s", filename);
529         if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
530                 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
531                         temp = strrchr(filename, '/');
532                         if (temp) {
533                                 char *temp2 = strrchr(filename, '/');
534                                 partition = 1;
535                                 *temp = 0x00;
536                                 dbg("temp2 = %s", temp2);
537                                 if (temp2 && (strcmp(temp2, "/block") == 0)) {
538                                         /* oops, we have no parent block device, so go back to original directory */
539                                         strcpy(filename, class_dev->path);
540                                         partition = 0;
541                                 }
542                         }
543                 }
544         }
545         strcat(filename, "/device");
546
547         loop = 2;
548         while (loop--) {
549                 struct stat buf;
550                 dbg("looking for '%s'", filename);
551                 retval = stat(filename, &buf);
552                 if (!retval)
553                         break;
554                 /* sleep to give the kernel a chance to create the device file */
555                 sleep(1);
556         }
557
558         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
559         while (loop--) {
560                 /* find the sysfs_device for this class device */
561                 /* Wouldn't it really be nice if libsysfs could do this for us? */
562                 sysfs_device = sysfs_get_classdev_device(class_dev);
563                 if (sysfs_device != NULL)
564                         goto exit;
565
566                 /* if it's a partition, we need to get the parent device */
567                 if (partition) {
568                         /* FIXME  HACK HACK HACK HACK
569                          * for some reason partitions need this extra sleep here, in order
570                          * to wait for the device properly.  Once the libsysfs code is
571                          * fixed properly, this sleep should go away, and we can just loop above.
572                          */
573                         sleep(1);
574                         dbg("really is a partition");
575                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
576                         if (class_dev_parent == NULL) {
577                                 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
578                         } else {
579                                 dbg("class_dev_parent->name='%s'", class_dev_parent->name);
580                                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
581                                 if (sysfs_device != NULL)
582                                         goto exit;
583                         }
584                 }
585                 /* sleep to give the kernel a chance to create the link */
586                 /* FIXME remove comment...
587                 sleep(1); */
588         }
589         dbg("Timed out waiting for device symlink, continuing on anyway...");
590 exit:
591         return sysfs_device;
592 }
593
594 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
595 {
596         struct sysfs_device *sysfs_device = NULL;
597         struct config_device *dev;
598         struct perm_device *perm;
599         char *pos;
600
601         udev->mode = 0;
602
603         /* find the sysfs_device associated with this class device */
604         sysfs_device = get_sysfs_device(class_dev);
605         if (sysfs_device) {
606                 dbg("sysfs_device->path='%s'", sysfs_device->path);
607                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
608                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
609                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
610                 wait_for_device_to_initialize(sysfs_device);
611         } else {
612                 dbg("class_dev->name = '%s'", class_dev->name);
613         }
614
615         strfieldcpy(udev->kernel_name, class_dev->name);
616
617         /* get kernel number */
618         pos = class_dev->name + strlen(class_dev->name);
619         while (isdigit(*(pos-1)))
620                 pos--;
621         strfieldcpy(udev->kernel_number, pos);
622         dbg("kernel_number='%s'", udev->kernel_number);
623
624         /* look for a matching rule to apply */
625         list_for_each_entry(dev, &config_device_list, node) {
626                 dbg("process rule");
627
628                 /* check for matching bus value */
629                 if (dev->bus[0] != '\0') {
630                         if (sysfs_device == NULL) {
631                                 dbg("device has no bus");
632                                 continue;
633                         }
634                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
635                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
636                                 dbg(FIELD_BUS " is not matching");
637                                 continue;
638                         } else {
639                                 dbg(FIELD_BUS " matches");
640                         }
641                 }
642
643                 /* check for matching kernel name*/
644                 if (dev->kernel[0] != '\0') {
645                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
646                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
647                                 dbg(FIELD_KERNEL " is not matching");
648                                 continue;
649                         } else {
650                                 dbg(FIELD_KERNEL " matches");
651                         }
652                 }
653
654                 /* check for matching bus id */
655                 if (dev->id[0] != '\0') {
656                         dbg("check " FIELD_ID);
657                         if (match_id(dev, class_dev, sysfs_device) != 0) {
658                                 dbg(FIELD_ID " is not matching");
659                                 continue;
660                         } else {
661                                 dbg(FIELD_ID " matches");
662                         }
663                 }
664
665                 /* check for matching place of device */
666                 if (dev->place[0] != '\0') {
667                         dbg("check " FIELD_PLACE);
668                         if (match_place(dev, class_dev, sysfs_device) != 0) {
669                                 dbg(FIELD_PLACE " is not matching");
670                                 continue;
671                         } else {
672                                 dbg(FIELD_PLACE " matches");
673                         }
674                 }
675
676                 /* check for matching sysfs pairs */
677                 if (dev->sysfs_pair[0].file[0] != '\0') {
678                         dbg("check " FIELD_SYSFS " pairs");
679                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
680                                 dbg(FIELD_SYSFS " is not matching");
681                                 continue;
682                         } else {
683                                 dbg(FIELD_SYSFS " matches");
684                         }
685                 }
686
687                 /* execute external program */
688                 if (dev->program[0] != '\0') {
689                         dbg("check " FIELD_PROGRAM);
690                         apply_format(udev, dev->program);
691                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
692                                 dbg(FIELD_PROGRAM " returned nozero");
693                                 continue;
694                         } else {
695                                 dbg(FIELD_PROGRAM " returned successful");
696                         }
697                 }
698
699                 /* check for matching result of external program */
700                 if (dev->result[0] != '\0') {
701                         dbg("check for " FIELD_RESULT
702                             " dev->result='%s', udev->program_result='%s'",
703                             dev->result, udev->program_result);
704                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
705                                 dbg(FIELD_RESULT " is not matching");
706                                 continue;
707                         } else {
708                                 dbg(FIELD_RESULT " matches");
709                         }
710                 }
711
712                 /* check if we are instructed to ignore this device */
713                 if (dev->name[0] == '\0') {
714                         dbg("instructed to ignore this device");
715                         return -1;
716                 }
717
718                 /* Yup, this rule belongs to us! */
719                 dbg("found matching rule, '%s' becomes '%s'", dev->kernel, udev->name);
720                 strfieldcpy(udev->name, dev->name);
721                 strfieldcpy(udev->symlink, dev->symlink);
722                 goto found;
723         }
724
725         /* no rule was found so we use the kernel name */
726         strfieldcpy(udev->name, class_dev->name);
727         goto done;
728
729 found:
730         /* substitute placeholder */
731         apply_format(udev, udev->name);
732         apply_format(udev, udev->symlink);
733
734 done:
735         perm = find_perm(udev->name);
736         if (perm) {
737                 udev->mode = perm->mode;
738                 strfieldcpy(udev->owner, perm->owner);
739                 strfieldcpy(udev->group, perm->group);
740         } else {
741                 /* no matching perms found :( */
742                 udev->mode = get_default_mode(class_dev);
743                 udev->owner[0] = 0x00;
744                 udev->group[0] = 0x00;
745         }
746         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
747             udev->name, udev->owner, udev->group, udev->mode);
748
749         return 0;
750 }
751
752 int namedev_init(void)
753 {
754         int retval;
755
756         retval = namedev_init_rules();
757         if (retval)
758                 return retval;
759
760         retval = namedev_init_permissions();
761         if (retval)
762                 return retval;
763
764         dump_config_dev_list();
765         dump_perm_dev_list();
766         return retval;
767 }