udev/udev-event.c

   1 /*
   2  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <stdio.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/socket.h>
  28 #include <net/if.h>
  29 #include <linux/sockios.h>
  30
  31 #include "udev.h"
  32
  33 struct udev_event *udev_event_new(struct udev_device *dev)
  34 {
  35         struct udev_event *event;
  36
  37         event = calloc(1, sizeof(struct udev_event));
  38         if (event == NULL)
  39                 return NULL;
  40         event->dev = dev;
  41         event->udev = udev_device_get_udev(dev);
  42         udev_list_init(&event->run_list);
  43         event->mode = 0660;
  44         dbg(event->udev, "allocated event %p\n", event);
  45         return event;
  46 }
  47
  48 void udev_event_unref(struct udev_event *event)
  49 {
  50         if (event == NULL)
  51                 return;
  52         udev_list_cleanup_entries(event->udev, &event->run_list);
  53         free(event->tmp_node);
  54         free(event->program_result);
  55         free(event->name);
  56         dbg(event->udev, "free event %p\n", event);
  57         free(event);
  58 }
  59
  60 /* extract possible {attr} and move str behind it */
  61 static char *get_format_attribute(struct udev *udev, char **str)
  62 {
  63         char *pos;
  64         char *attr = NULL;
  65
  66         if (*str[0] == '{') {
  67                 pos = strchr(*str, '}');
  68                 if (pos == NULL) {
  69                         err(udev, "missing closing brace for format\n");
  70                         return NULL;
  71                 }
  72                 pos[0] = '\0';
  73                 attr = *str+1;
  74                 *str = pos+1;
  75                 dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
  76         }
  77         return attr;
  78 }
  79
  80 void udev_event_apply_format(struct udev_event *event, char *string, size_t maxsize)
  81 {
  82         struct udev_device *dev = event->dev;
  83         char temp[UTIL_PATH_SIZE];
  84         char temp2[UTIL_PATH_SIZE];
  85         char *head, *tail, *cpos, *attr, *rest;
  86         int i;
  87         int count;
  88         enum subst_type {
  89                 SUBST_UNKNOWN,
  90                 SUBST_DEVPATH,
  91                 SUBST_KERNEL,
  92                 SUBST_KERNEL_NUMBER,
  93                 SUBST_ID,
  94                 SUBST_DRIVER,
  95                 SUBST_MAJOR,
  96                 SUBST_MINOR,
  97                 SUBST_RESULT,
  98                 SUBST_ATTR,
  99                 SUBST_PARENT,
 100                 SUBST_TEMP_NODE,
 101                 SUBST_NAME,
 102                 SUBST_LINKS,
 103                 SUBST_ROOT,
 104                 SUBST_SYS,
 105                 SUBST_ENV,
 106         };
 107         static const struct subst_map {
 108                 char *name;
 109                 char fmt;
 110                 enum subst_type type;
 111         } map[] = {
 112                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 113                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 114                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 115                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 116                 { .name = "driver",     .fmt = 'd',     .type = SUBST_DRIVER },
 117                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 118                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 119                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 120                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 121                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 122                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 123                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 124                 { .name = "name",       .fmt = 'D',     .type = SUBST_NAME },
 125                 { .name = "links",      .fmt = 'L',     .type = SUBST_LINKS },
 126                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 127                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 128                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 129                 { NULL, '\0', 0 }
 130         };
 131         enum subst_type type;
 132         const struct subst_map *subst;
 133
 134         head = string;
 135         while (1) {
 136                 while (head[0] != '\0') {
 137                         if (head[0] == '$') {
 138                                 /* substitute named variable */
 139                                 if (head[1] == '\0')
 140                                         break;
 141                                 if (head[1] == '$') {
 142                                         util_strlcpy(temp, head+2, sizeof(temp));
 143                                         util_strlcpy(head+1, temp, maxsize);
 144                                         head++;
 145                                         continue;
 146                                 }
 147                                 head[0] = '\0';
 148                                 for (subst = map; subst->name; subst++) {
 149                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 150                                                 type = subst->type;
 151                                                 tail = head + strlen(subst->name)+1;
 152                                                 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
 153                                                 goto found;
 154                                         }
 155                                 }
 156                                 head[0] = '$';
 157                                 err(event->udev, "unknown format variable '%s'\n", head);
 158                         } else if (head[0] == '%') {
 159                                 /* substitute format char */
 160                                 if (head[1] == '\0')
 161                                         break;
 162                                 if (head[1] == '%') {
 163                                         util_strlcpy(temp, head+2, sizeof(temp));
 164                                         util_strlcpy(head+1, temp, maxsize);
 165                                         head++;
 166                                         continue;
 167                                 }
 168                                 head[0] = '\0';
 169                                 tail = head+1;
 170                                 for (subst = map; subst->name; subst++) {
 171                                         if (tail[0] == subst->fmt) {
 172                                                 type = subst->type;
 173                                                 tail++;
 174                                                 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
 175                                                 goto found;
 176                                         }
 177                                 }
 178                                 head[0] = '%';
 179                                 err(event->udev, "unknown format char '%c'\n", tail[0]);
 180                         }
 181                         head++;
 182                 }
 183                 break;
 184 found:
 185                 attr = get_format_attribute(event->udev, &tail);
 186                 util_strlcpy(temp, tail, sizeof(temp));
 187                 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
 188
 189                 switch (type) {
 190                 case SUBST_DEVPATH:
 191                         util_strlcat(string, udev_device_get_devpath(dev), maxsize);
 192                         dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
 193                         break;
 194                 case SUBST_KERNEL:
 195                         util_strlcat(string, udev_device_get_sysname(dev), maxsize);
 196                         dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
 197                         break;
 198                 case SUBST_KERNEL_NUMBER:
 199                         if (udev_device_get_sysnum(dev) == NULL)
 200                                 break;
 201                         util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
 202                         dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
 203                         break;
 204                 case SUBST_ID:
 205                         if (event->dev_parent != NULL) {
 206                                 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
 207                                 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
 208                         }
 209                         break;
 210                 case SUBST_DRIVER:
 211                         if (event->dev_parent != NULL) {
 212                                 const char *driver;
 213
 214                                 driver = udev_device_get_driver(event->dev_parent);
 215                                 if (driver == NULL)
 216                                         break;
 217                                 util_strlcat(string, driver, maxsize);
 218                                 dbg(event->udev, "substitute driver '%s'\n", driver);
 219                         }
 220                         break;
 221                 case SUBST_MAJOR:
 222                         sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
 223                         util_strlcat(string, temp2, maxsize);
 224                         dbg(event->udev, "substitute major number '%s'\n", temp2);
 225                         break;
 226                 case SUBST_MINOR:
 227                         sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
 228                         util_strlcat(string, temp2, maxsize);
 229                         dbg(event->udev, "substitute minor number '%s'\n", temp2);
 230                         break;
 231                 case SUBST_RESULT:
 232                         if (event->program_result == NULL)
 233                                 break;
 234                         /* get part part of the result string */
 235                         i = 0;
 236                         if (attr != NULL)
 237                                 i = strtoul(attr, &rest, 10);
 238                         if (i > 0) {
 239                                 char result[UTIL_PATH_SIZE];
 240
 241                                 dbg(event->udev, "request part #%d of result string\n", i);
 242                                 util_strlcpy(result, event->program_result, sizeof(result));
 243                                 cpos = result;
 244                                 while (--i) {
 245                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 246                                                 cpos++;
 247                                         while (isspace(cpos[0]))
 248                                                 cpos++;
 249                                 }
 250                                 if (i > 0) {
 251                                         err(event->udev, "requested part of result string not found\n");
 252                                         break;
 253                                 }
 254                                 util_strlcpy(temp2, cpos, sizeof(temp2));
 255                                 /* %{2+}c copies the whole string from the second part on */
 256                                 if (rest[0] != '+') {
 257                                         cpos = strchr(temp2, ' ');
 258                                         if (cpos)
 259                                                 cpos[0] = '\0';
 260                                 }
 261                                 util_strlcat(string, temp2, maxsize);
 262                                 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
 263                         } else {
 264                                 util_strlcat(string, event->program_result, maxsize);
 265                                 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
 266                         }
 267                         break;
 268                 case SUBST_ATTR:
 269                         if (attr == NULL)
 270                                 err(event->udev, "missing file parameter for attr\n");
 271                         else {
 272                                 const char *val;
 273                                 char value[UTIL_NAME_SIZE];
 274                                 size_t size;
 275
 276                                 value[0] = '\0';
 277                                 /* read the value specified by [usb/]*/
 278                                 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
 279
 280                                 /* try to read attribute of the current device */
 281                                 if (value[0] == '\0') {
 282                                         val = udev_device_get_sysattr_value(event->dev, attr);
 283                                         if (val != NULL)
 284                                                 util_strlcpy(value, val, sizeof(value));
 285                                 }
 286
 287                                 /* try to read the attribute of the parent device, other matches have selected */
 288                                 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
 289                                         val = udev_device_get_sysattr_value(event->dev_parent, attr);
 290                                         if (val != NULL)
 291                                                 util_strlcpy(value, val, sizeof(value));
 292                                 }
 293
 294                                 if (value[0]=='\0')
 295                                         break;
 296
 297                                 /* strip trailing whitespace, and replace unwanted characters */
 298                                 size = strlen(value);
 299                                 while (size > 0 && isspace(value[--size]))
 300                                         value[size] = '\0';
 301                                 count = udev_util_replace_chars(value, UDEV_ALLOWED_CHARS_INPUT);
 302                                 if (count > 0)
 303                                         info(event->udev, "%i character(s) replaced\n" , count);
 304                                 util_strlcat(string, value, maxsize);
 305                                 dbg(event->udev, "substitute sysfs value '%s'\n", value);
 306                         }
 307                         break;
 308                 case SUBST_PARENT:
 309                         {
 310                                 struct udev_device *dev_parent;
 311                                 const char *devnode;
 312
 313                                 dev_parent = udev_device_get_parent(event->dev);
 314                                 if (dev_parent == NULL)
 315                                         break;
 316                                 devnode = udev_device_get_devnode(dev_parent);
 317                                 if (devnode != NULL) {
 318                                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 319
 320                                         util_strlcat(string, &devnode[devlen], maxsize);
 321                                         dbg(event->udev, "found parent '%s', got node name '%s'\n",
 322                                             udev_device_get_syspath(dev_parent), &devnode[devlen]);
 323                                 }
 324                         }
 325                         break;
 326                 case SUBST_TEMP_NODE:
 327                         {
 328                                 dev_t devnum;
 329                                 struct stat statbuf;
 330                                 char filename[UTIL_PATH_SIZE];
 331                                 const char *devtype;
 332
 333                                 if (event->tmp_node != NULL) {
 334                                         util_strlcat(string, event->tmp_node, maxsize);
 335                                         dbg(event->udev, "tempnode: return earlier created one\n");
 336                                         break;
 337                                 }
 338                                 devnum = udev_device_get_devnum(dev);
 339                                 if (major(devnum) == 0)
 340                                         break;
 341                                 /* lookup kernel provided node */
 342                                 if (udev_device_get_knodename(dev) != NULL) {
 343                                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
 344                                         util_strlcat(filename, "/", sizeof(filename));
 345                                         util_strlcat(filename, udev_device_get_knodename(dev), sizeof(filename));
 346                                         if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 347                                                 util_strlcat(string, filename, maxsize);
 348                                                 dbg(event->udev, "tempnode: return kernel node\n");
 349                                                 break;
 350                                         }
 351                                 }
 352                                 /* lookup /dev/{char,block}/<maj>:<min> */
 353                                 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
 354                                         devtype = "block";
 355                                 else
 356                                         devtype = "char";
 357                                 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
 358                                          udev_get_dev_path(event->udev), devtype,
 359                                          major(udev_device_get_devnum(dev)),
 360                                          minor(udev_device_get_devnum(dev)));
 361                                 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 362                                         util_strlcat(string, filename, maxsize);
 363                                         dbg(event->udev, "tempnode: return maj:min node\n");
 364                                         break;
 365                                 }
 366                                 /* create temporary node */
 367                                 dbg(event->udev, "tempnode: create temp node\n");
 368                                 asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
 369                                          udev_get_dev_path(event->udev), devtype,
 370                                          major(udev_device_get_devnum(dev)),
 371                                          minor(udev_device_get_devnum(dev)));
 372                                 if (event->tmp_node == NULL)
 373                                         break;
 374                                 udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
 375                                 util_strlcat(string, event->tmp_node, maxsize);
 376                         }
 377                         break;
 378                 case SUBST_NAME:
 379                         if (event->name != NULL) {
 380                                 util_strlcat(string, event->name, maxsize);
 381                                 dbg(event->udev, "substitute name '%s'\n", event->name);
 382                         } else {
 383                                 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
 384                                 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
 385                         }
 386                         break;
 387                 case SUBST_LINKS:
 388                         {
 389                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 390                                 struct udev_list_entry *list_entry;
 391
 392                                 list_entry = udev_device_get_devlinks_list_entry(dev);
 393                                 if (list_entry == NULL)
 394                                         break;
 395                                 util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
 396                                 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
 397                                         util_strlcat(string, " ", maxsize);
 398                                         util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
 399                                 }
 400                         }
 401                         break;
 402                 case SUBST_ROOT:
 403                         util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
 404                         dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
 405                         break;
 406                 case SUBST_SYS:
 407                         util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
 408                         dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
 409                         break;
 410                 case SUBST_ENV:
 411                         if (attr == NULL) {
 412                                 dbg(event->udev, "missing attribute\n");
 413                                 break;
 414                         } else {
 415                                 const char *value;
 416
 417                                 value = udev_device_get_property_value(event->dev, attr);
 418                                 if (value == NULL)
 419                                         break;
 420                                 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
 421                                 util_strlcat(string, value, maxsize);
 422                                 break;
 423                         }
 424                 default:
 425                         err(event->udev, "unknown substitution type=%i\n", type);
 426                         break;
 427                 }
 428                 util_strlcat(string, temp, maxsize);
 429         }
 430 }
 431
 432 static void rename_netif_kernel_log(struct ifreq ifr)
 433 {
 434         int klog;
 435         FILE *f;
 436
 437         klog = open("/dev/kmsg", O_WRONLY);
 438         if (klog < 0)
 439                 return;
 440
 441         f = fdopen(klog, "w");
 442         if (f == NULL) {
 443                 close(klog);
 444                 return;
 445         }
 446
 447         fprintf(f, "<6>udev: renamed network interface %s to %s\n",
 448                 ifr.ifr_name, ifr.ifr_newname);
 449         fclose(f);
 450 }
 451
 452 static int rename_netif(struct udev_event *event)
 453 {
 454         struct udev_device *dev = event->dev;
 455         int sk;
 456         struct ifreq ifr;
 457         int err;
 458
 459         info(event->udev, "changing net interface name from '%s' to '%s'\n",
 460              udev_device_get_sysname(dev), event->name);
 461
 462         sk = socket(PF_INET, SOCK_DGRAM, 0);
 463         if (sk < 0) {
 464                 err(event->udev, "error opening socket: %m\n");
 465                 return -1;
 466         }
 467
 468         memset(&ifr, 0x00, sizeof(struct ifreq));
 469         util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
 470         util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
 471         err = ioctl(sk, SIOCSIFNAME, &ifr);
 472         if (err == 0)
 473                 rename_netif_kernel_log(ifr);
 474         else {
 475                 int loop;
 476
 477                 /* see if the destination interface name already exists */
 478                 if (errno != EEXIST) {
 479                         err(event->udev, "error changing netif name %s to %s: %m\n",
 480                             ifr.ifr_name, ifr.ifr_newname);
 481                         goto exit;
 482                 }
 483
 484                 /* free our own name, another process may wait for us */
 485                 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
 486                 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
 487                 err = ioctl(sk, SIOCSIFNAME, &ifr);
 488                 if (err != 0) {
 489                         err(event->udev, "error changing netif name %s to %s: %m\n",
 490                             ifr.ifr_name, ifr.ifr_newname);
 491                         goto exit;
 492                 }
 493
 494                 /* wait 90 seconds for our target to become available */
 495                 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
 496                 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
 497                 loop = 90 * 20;
 498                 while (loop--) {
 499                         err = ioctl(sk, SIOCSIFNAME, &ifr);
 500                         if (err == 0) {
 501                                 rename_netif_kernel_log(ifr);
 502                                 break;
 503                         }
 504
 505                         if (errno != EEXIST) {
 506                                 err(event->udev, "error changing net interface name %s to %s: %m\n",
 507                                     ifr.ifr_name, ifr.ifr_newname);
 508                                 break;
 509                         }
 510                         dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
 511                             event->name, (90 * 20) - loop);
 512                         usleep(1000 * 1000 / 20);
 513                 }
 514         }
 515 exit:
 516         close(sk);
 517         return err;
 518 }
 519
 520 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
 521 {
 522         struct udev_device *dev = event->dev;
 523         int err = 0;
 524
 525         if (udev_device_get_devpath_old(dev) != NULL) {
 526                 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
 527                         info(event->udev, "moved database from '%s' to '%s'\n",
 528                              udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
 529         }
 530
 531         /* add device node */
 532         if (major(udev_device_get_devnum(dev)) != 0 &&
 533             (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
 534                 char filename[UTIL_PATH_SIZE];
 535                 struct udev_device *dev_old;
 536                 int delete_kdevnode = 0;
 537
 538                 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
 539
 540                 /* read old database entry */
 541                 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
 542                 if (dev_old != NULL) {
 543                         udev_device_read_db(dev_old);
 544                         udev_device_set_info_loaded(dev_old);
 545
 546                         /* disable watch during event processing */
 547                         udev_watch_end(event->udev, dev_old);
 548                 }
 549
 550                 udev_rules_apply_to_event(rules, event);
 551                 if (event->tmp_node != NULL) {
 552                         dbg(event->udev, "cleanup temporary device node\n");
 553                         util_unlink_secure(event->udev, event->tmp_node);
 554                         free(event->tmp_node);
 555                         event->tmp_node = NULL;
 556                 }
 557
 558                 if (event->ignore_device) {
 559                         info(event->udev, "device event will be ignored\n");
 560                         delete_kdevnode = 1;
 561                         goto exit_add;
 562                 }
 563
 564                 if (event->name != NULL && event->name[0] == '\0') {
 565                         info(event->udev, "device node creation supressed\n");
 566                         delete_kdevnode = 1;
 567                         goto exit_add;
 568                 }
 569
 570                 /* if rule given name disagrees with kernel node name, delete kernel node */
 571                 if (event->name != NULL && udev_device_get_knodename(dev) != NULL) {
 572                         if (strcmp(event->name, udev_device_get_knodename(dev)) != 0)
 573                                 delete_kdevnode = 1;
 574                 }
 575
 576                 /* no rule, use kernel provided name */
 577                 if (event->name == NULL) {
 578                         if (udev_device_get_knodename(dev) != NULL) {
 579                                 event->name = strdup(udev_device_get_knodename(dev));
 580                                 info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
 581                         } else {
 582                                 event->name = strdup(udev_device_get_sysname(event->dev));
 583                                 info(event->udev, "no node name set, will use device name '%s'\n", event->name);
 584                         }
 585                 }
 586
 587                 /* something went wrong */
 588                 if (event->name == NULL) {
 589                         err(event->udev, "no node name for '%s'\n", udev_device_get_sysname(event->dev));
 590                         goto exit_add;
 591                 }
 592
 593                 /* set device node name */
 594                 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
 595                 util_strlcat(filename, "/", sizeof(filename));
 596                 util_strlcat(filename, event->name, sizeof(filename));
 597                 udev_device_set_devnode(dev, filename);
 598
 599                 /* write current database entry */
 600                 udev_device_update_db(dev);
 601
 602                 /* remove/update possible left-over symlinks from old database entry */
 603                 if (dev_old != NULL)
 604                         udev_node_update_old_links(dev, dev_old);
 605
 606                 /* create new node and symlinks */
 607                 err = udev_node_add(dev, event->mode, event->uid, event->gid);
 608 exit_add:
 609                 if (delete_kdevnode && udev_device_get_knodename(dev) != NULL) {
 610                         struct stat stats;
 611
 612                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
 613                         util_strlcat(filename, "/", sizeof(filename));
 614                         util_strlcat(filename, udev_device_get_knodename(dev), sizeof(filename));
 615                         if (stat(filename, &stats) == 0 && stats.st_rdev == udev_device_get_devnum(dev)) {
 616                                 unlink(filename);
 617                                 util_delete_path(event->udev, filename);
 618                                 info(event->udev, "removed kernel created node '%s'\n", filename);
 619                         }
 620                 }
 621                 udev_device_unref(dev_old);
 622                 goto exit;
 623         }
 624
 625         /* add netif */
 626         if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
 627                 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
 628                 udev_device_delete_db(dev);
 629
 630                 udev_rules_apply_to_event(rules, event);
 631                 if (event->ignore_device) {
 632                         info(event->udev, "device event will be ignored\n");
 633                         goto exit;
 634                 }
 635                 if (event->name == NULL)
 636                         goto exit;
 637
 638                 /* look if we want to change the name of the netif */
 639                 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
 640                         char syspath[UTIL_PATH_SIZE];
 641                         char *pos;
 642
 643                         err = rename_netif(event);
 644                         if (err != 0)
 645                                 goto exit;
 646                         info(event->udev, "renamed netif to '%s'\n", event->name);
 647
 648                         /* remember old name */
 649                         udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
 650
 651                         /* now change the devpath, because the kernel device name has changed */
 652                         util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
 653                         pos = strrchr(syspath, '/');
 654                         if (pos != NULL) {
 655                                 pos[1] = '\0';
 656                                 util_strlcat(syspath, event->name, sizeof(syspath));
 657                                 udev_device_set_syspath(event->dev, syspath);
 658                                 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
 659                                 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
 660                         }
 661                 }
 662                 udev_device_update_db(dev);
 663                 goto exit;
 664         }
 665
 666         /* remove device node */
 667         if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
 668                 /* import database entry and delete it */
 669                 udev_device_read_db(dev);
 670                 udev_device_set_info_loaded(dev);
 671                 udev_device_delete_db(dev);
 672
 673                 /* remove watch */
 674                 udev_watch_end(event->udev, dev);
 675
 676                 if (udev_device_get_devnode(dev) == NULL) {
 677                         char devnode[UTIL_PATH_SIZE];
 678
 679                         info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
 680                              udev_device_get_syspath(dev), udev_device_get_sysname(dev));
 681                         util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
 682                         util_strlcat(devnode, "/", sizeof(devnode));
 683                         util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
 684                         udev_device_set_devnode(dev, devnode);
 685                 }
 686
 687                 udev_rules_apply_to_event(rules, event);
 688                 if (event->ignore_device) {
 689                         info(event->udev, "device event will be ignored\n");
 690                         goto exit;
 691                 }
 692
 693                 if (udev_device_get_ignore_remove(dev)) {
 694                         info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
 695                         goto exit;
 696                 }
 697
 698                 err = udev_node_remove(dev);
 699                 goto exit;
 700         }
 701
 702         /* default devices */
 703         udev_rules_apply_to_event(rules, event);
 704         if (event->ignore_device)
 705                 info(event->udev, "device event will be ignored\n");
 706
 707         if (strcmp(udev_device_get_action(dev), "remove") != 0)
 708                 udev_device_update_db(dev);
 709         else
 710                 udev_device_delete_db(dev);
 711 exit:
 712         return err;
 713 }
 714
 715 int udev_event_execute_run(struct udev_event *event)
 716 {
 717         struct udev_list_entry *list_entry;
 718         int err = 0;
 719
 720         dbg(event->udev, "executing run list\n");
 721         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 722                 const char *cmd = udev_list_entry_get_name(list_entry);
 723
 724                 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
 725                         struct udev_monitor *monitor;
 726
 727                         monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
 728                         if (monitor == NULL)
 729                                 continue;
 730                         udev_monitor_send_device(monitor, event->dev);
 731                         udev_monitor_unref(monitor);
 732                 } else {
 733                         char program[UTIL_PATH_SIZE];
 734                         char **envp;
 735
 736                         util_strlcpy(program, cmd, sizeof(program));
 737                         udev_event_apply_format(event, program, sizeof(program));
 738                         if (event->trace)
 739                                 fprintf(stderr, "run  %s (%llu) '%s'\n",
 740                                        udev_device_get_syspath(event->dev),
 741                                        udev_device_get_seqnum(event->dev),
 742                                        program);
 743                         envp = udev_device_get_properties_envp(event->dev);
 744                         if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
 745                                 if (!udev_list_entry_get_flag(list_entry))
 746                                         err = -1;
 747                         }
 748                 }
 749         }
 750         return err;
 751 }