udevtrigger.c

   1 /*
   2  * udevtrigger.c
   3  *
   4  * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
   5  * Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stdlib.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <dirent.h>
  29 #include <fcntl.h>
  30 #include <syslog.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33
  34 #include "udev.h"
  35
  36 static const char *udev_log_str;
  37 static int verbose;
  38 static int dry_run;
  39
  40 #ifdef USE_LOG
  41 void log_message(int priority, const char *format, ...)
  42 {
  43         va_list args;
  44
  45         if (priority > udev_log_priority)
  46                 return;
  47
  48         va_start(args, format);
  49         vsyslog(priority, format, args);
  50         va_end(args);
  51 }
  52 #endif
  53
  54 /* list of devices that we should run last due to any one of a number of reasons */
  55 static char *last_list[] = {
  56         "/class/block/md",
  57         "/class/block/dm-",
  58         "/block/md",
  59         "/block/dm-",
  60         NULL
  61 };
  62
  63 /* list of devices that we should run first due to any one of a number of reasons */
  64 static char *first_list[] = {
  65         "/class/mem",
  66         "/class/tty",
  67         NULL
  68 };
  69
  70 LIST_HEAD(device_first_list);
  71 LIST_HEAD(device_default_list);
  72 LIST_HEAD(device_last_list);
  73
  74 static int device_list_insert(const char *path)
  75 {
  76         struct list_head *device_list = &device_default_list;
  77         int i;
  78
  79         for (i = 0; first_list[i] != NULL; i++) {
  80                 if (strncmp(path, first_list[i], strlen(first_list[i])) == 0) {
  81                         device_list = &device_first_list;
  82                         break;
  83                 }
  84         }
  85         for (i = 0; last_list[i] != NULL; i++) {
  86                 if (strncmp(path, last_list[i], strlen(last_list[i])) == 0) {
  87                         device_list = &device_last_list;
  88                         break;
  89                 }
  90         }
  91
  92         dbg("add '%s'" , path);
  93         /* double entries will be ignored */
  94         name_list_add(device_list, path, 0);
  95         return 0;
  96 }
  97
  98 static void trigger_uevent(const char *path)
  99 {
 100         char filename[PATH_SIZE];
 101         int fd;
 102
 103         strlcpy(filename, path, sizeof(filename));
 104         strlcat(filename, "/uevent", sizeof(filename));
 105
 106         if (verbose)
 107                 printf("%s\n", path);
 108
 109         if (dry_run)
 110                 return;
 111
 112         fd = open(filename, O_WRONLY);
 113         if (fd < 0) {
 114                 dbg("error on opening %s: %s\n", filename, strerror(errno));
 115                 return;
 116         }
 117
 118         if (write(fd, "add", 3) < 0)
 119                 info("error on triggering %s: %s\n", filename, strerror(errno));
 120
 121         close(fd);
 122 }
 123
 124 static void exec_lists(void)
 125 {
 126         struct name_entry *loop_device;
 127         struct name_entry *tmp_device;
 128
 129         /* handle the devices on the "first" list first */
 130         list_for_each_entry_safe(loop_device, tmp_device, &device_first_list, node) {
 131                 trigger_uevent(loop_device->name);
 132                 list_del(&loop_device->node);
 133                 free(loop_device);
 134         }
 135
 136         /* handle the devices on the "default" list next */
 137         list_for_each_entry_safe(loop_device, tmp_device, &device_default_list, node) {
 138                 trigger_uevent(loop_device->name);
 139                 list_del(&loop_device->node);
 140                 free(loop_device);
 141         }
 142
 143         /* handle devices on the "last" list, if any */
 144         list_for_each_entry_safe(loop_device, tmp_device, &device_last_list, node) {
 145                 trigger_uevent(loop_device->name);
 146                 list_del(&loop_device->node);
 147                 free(loop_device);
 148         }
 149 }
 150
 151 static int is_device(const char *path)
 152 {
 153         char filename[PATH_SIZE];
 154         struct stat statbuf;
 155
 156         /* look for the uevent file of the kobject */
 157         strlcpy(filename, path, sizeof(filename));
 158         strlcat(filename, "/uevent", sizeof(filename));
 159         if (stat(filename, &statbuf) < 0)
 160                 return 0;
 161
 162         if (!(statbuf.st_mode & S_IWUSR))
 163                 return 0;
 164
 165         return 1;
 166 }
 167
 168 static void udev_scan_bus(void)
 169 {
 170         char base[PATH_SIZE];
 171         DIR *dir;
 172         struct dirent *dent;
 173
 174         strlcpy(base, sysfs_path, sizeof(base));
 175         strlcat(base, "/bus", sizeof(base));
 176
 177         dir = opendir(base);
 178         if (dir != NULL) {
 179                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 180                         char dirname[PATH_SIZE];
 181                         DIR *dir2;
 182                         struct dirent *dent2;
 183
 184                         if (dent->d_name[0] == '.')
 185                                 continue;
 186
 187                         strlcpy(dirname, base, sizeof(dirname));
 188                         strlcat(dirname, "/", sizeof(dirname));
 189                         strlcat(dirname, dent->d_name, sizeof(dirname));
 190                         strlcat(dirname, "/devices", sizeof(dirname));
 191
 192                         /* look for devices */
 193                         dir2 = opendir(dirname);
 194                         if (dir2 != NULL) {
 195                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 196                                         char dirname2[PATH_SIZE];
 197
 198                                         if (dent2->d_name[0] == '.')
 199                                                 continue;
 200
 201                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 202                                         strlcat(dirname2, "/", sizeof(dirname2));
 203                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 204
 205                                         if (is_device(dirname2))
 206                                                 device_list_insert(dirname2);
 207                                 }
 208                                 closedir(dir2);
 209                         }
 210                 }
 211                 closedir(dir);
 212         }
 213 }
 214
 215 static void udev_scan_block(void)
 216 {
 217         char base[PATH_SIZE];
 218         DIR *dir;
 219         struct dirent *dent;
 220         struct stat statbuf;
 221
 222         /* skip if "block" is already a "class" */
 223         strlcpy(base, sysfs_path, sizeof(base));
 224         strlcat(base, "/class/block", sizeof(base));
 225         if (stat(base, &statbuf) == 0)
 226                 return;
 227
 228         strlcpy(base, sysfs_path, sizeof(base));
 229         strlcat(base, "/block", sizeof(base));
 230
 231         dir = opendir(base);
 232         if (dir != NULL) {
 233                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 234                         char dirname[PATH_SIZE];
 235                         DIR *dir2;
 236                         struct dirent *dent2;
 237
 238                         if (dent->d_name[0] == '.')
 239                                 continue;
 240
 241                         strlcpy(dirname, base, sizeof(dirname));
 242                         strlcat(dirname, "/", sizeof(dirname));
 243                         strlcat(dirname, dent->d_name, sizeof(dirname));
 244                         if (is_device(dirname))
 245                                 device_list_insert(dirname);
 246                         else
 247                                 continue;
 248
 249                         /* look for partitions */
 250                         dir2 = opendir(dirname);
 251                         if (dir2 != NULL) {
 252                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 253                                         char dirname2[PATH_SIZE];
 254
 255                                         if (dent2->d_name[0] == '.')
 256                                                 continue;
 257
 258                                         if (!strcmp(dent2->d_name,"device"))
 259                                                 continue;
 260
 261                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 262                                         strlcat(dirname2, "/", sizeof(dirname2));
 263                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 264                                         if (is_device(dirname2))
 265                                                 device_list_insert(dirname2);
 266                                 }
 267                                 closedir(dir2);
 268                         }
 269                 }
 270                 closedir(dir);
 271         }
 272 }
 273
 274 static void udev_scan_class(void)
 275 {
 276         char base[PATH_SIZE];
 277         DIR *dir;
 278         struct dirent *dent;
 279
 280         strlcpy(base, sysfs_path, sizeof(base));
 281         strlcat(base, "/class", sizeof(base));
 282
 283         dir = opendir(base);
 284         if (dir != NULL) {
 285                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 286                         char dirname[PATH_SIZE];
 287                         DIR *dir2;
 288                         struct dirent *dent2;
 289
 290                         if (dent->d_name[0] == '.')
 291                                 continue;
 292
 293                         strlcpy(dirname, base, sizeof(dirname));
 294                         strlcat(dirname, "/", sizeof(dirname));
 295                         strlcat(dirname, dent->d_name, sizeof(dirname));
 296                         dir2 = opendir(dirname);
 297                         if (dir2 != NULL) {
 298                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 299                                         char dirname2[PATH_SIZE];
 300
 301                                         if (dent2->d_name[0] == '.')
 302                                                 continue;
 303
 304                                         if (!strcmp(dent2->d_name, "device"))
 305                                                 continue;
 306
 307                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 308                                         strlcat(dirname2, "/", sizeof(dirname2));
 309                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 310                                         if (is_device(dirname2))
 311                                                 device_list_insert(dirname2);
 312                                 }
 313                                 closedir(dir2);
 314                         }
 315                 }
 316                 closedir(dir);
 317         }
 318 }
 319
 320 int main(int argc, char *argv[], char *envp[])
 321 {
 322         int i;
 323
 324         logging_init("udevtrigger");
 325         udev_config_init();
 326         dbg("version %s", UDEV_VERSION);
 327
 328         udev_log_str = getenv("UDEV_LOG");
 329
 330         for (i = 1 ; i < argc; i++) {
 331                 char *arg = argv[i];
 332
 333                 if (strcmp(arg, "--verbose") == 0 || strcmp(arg, "-v") == 0)
 334                         verbose = 1;
 335                 else if (strcmp(arg, "--dry-run") == 0 || strcmp(arg, "-n") == 0)
 336                         dry_run = 1;
 337                 else {
 338                         fprintf(stderr, "Usage: udevtrigger [--verbose] [--dry-run]\n");
 339                         goto exit;
 340                 }
 341         }
 342
 343         sysfs_init();
 344
 345         udev_scan_bus();
 346         udev_scan_class();
 347         udev_scan_block();
 348         exec_lists();
 349
 350         sysfs_cleanup();
 351 exit:
 352         logging_close();
 353         return 0;
 354 }