udev/udev-event.c

   1 /*
   2  * Copyright (C) 2003-2010 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 <time.h>
  27 #include <net/if.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/socket.h>
  30 #include <linux/sockios.h>
  31
  32 #include "udev.h"
  33
  34 struct udev_event *udev_event_new(struct udev_device *dev)
  35 {
  36         struct udev_event *event;
  37
  38         event = calloc(1, sizeof(struct udev_event));
  39         if (event == NULL)
  40                 return NULL;
  41         event->mode = 0600;
  42         event->dev = dev;
  43         event->udev = udev_device_get_udev(dev);
  44         udev_list_init(&event->run_list);
  45         dbg(event->udev, "allocated event %p\n", event);
  46         return event;
  47 }
  48
  49 void udev_event_unref(struct udev_event *event)
  50 {
  51         if (event == NULL)
  52                 return;
  53         udev_list_cleanup_entries(event->udev, &event->run_list);
  54         free(event->tmp_node);
  55         free(event->program_result);
  56         free(event->name);
  57         dbg(event->udev, "free event %p\n", event);
  58         free(event);
  59 }
  60
  61 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
  62 {
  63         struct udev_device *dev = event->dev;
  64         enum subst_type {
  65                 SUBST_UNKNOWN,
  66                 SUBST_TEMP_NODE,
  67                 SUBST_ATTR,
  68                 SUBST_ENV,
  69                 SUBST_KERNEL,
  70                 SUBST_KERNEL_NUMBER,
  71                 SUBST_DRIVER,
  72                 SUBST_DEVPATH,
  73                 SUBST_ID,
  74                 SUBST_MAJOR,
  75                 SUBST_MINOR,
  76                 SUBST_RESULT,
  77                 SUBST_PARENT,
  78                 SUBST_NAME,
  79                 SUBST_LINKS,
  80                 SUBST_ROOT,
  81                 SUBST_SYS,
  82         };
  83         static const struct subst_map {
  84                 char *name;
  85                 char fmt;
  86                 enum subst_type type;
  87         } map[] = {
  88                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
  89                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
  90                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
  91                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
  92                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
  93                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
  94                 { .name = "driver",     .fmt = 'd',     .type = SUBST_DRIVER },
  95                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
  96                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
  97                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
  98                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
  99                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 100                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 101                 { .name = "name",       .fmt = 'D',     .type = SUBST_NAME },
 102                 { .name = "links",      .fmt = 'L',     .type = SUBST_LINKS },
 103                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 104                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 105         };
 106         const char *from;
 107         char *s;
 108         size_t l;
 109
 110         from = src;
 111         s = dest;
 112         l = size;
 113
 114         for (;;) {
 115                 enum subst_type type = SUBST_UNKNOWN;
 116                 char attrbuf[UTIL_PATH_SIZE];
 117                 char *attr = NULL;
 118
 119                 while (from[0] != '\0') {
 120                         if (from[0] == '$') {
 121                                 /* substitute named variable */
 122                                 unsigned int i;
 123
 124                                 if (from[1] == '$') {
 125                                         from++;
 126                                         goto copy;
 127                                 }
 128
 129                                 for (i = 0; i < ARRAY_SIZE(map); i++) {
 130                                         if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
 131                                                 type = map[i].type;
 132                                                 from += strlen(map[i].name)+1;
 133                                                 dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
 134                                                 goto subst;
 135                                         }
 136                                 }
 137                         } else if (from[0] == '%') {
 138                                 /* substitute format char */
 139                                 unsigned int i;
 140
 141                                 if (from[1] == '%') {
 142                                         from++;
 143                                         goto copy;
 144                                 }
 145
 146                                 for (i = 0; i < ARRAY_SIZE(map); i++) {
 147                                         if (from[1] == map[i].fmt) {
 148                                                 type = map[i].type;
 149                                                 from += 2;
 150                                                 dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
 151                                                 goto subst;
 152                                         }
 153                                 }
 154                         }
 155 copy:
 156                         /* copy char */
 157                         if (l == 0)
 158                                 goto out;
 159                         s[0] = from[0];
 160                         from++;
 161                         s++;
 162                         l--;
 163                 }
 164
 165                 goto out;
 166 subst:
 167                 /* extract possible $format{attr} */
 168                 if (from[0] == '{') {
 169                         unsigned int i;
 170
 171                         from++;
 172                         for (i = 0; from[i] != '}'; i++) {
 173                                 if (from[i] == '\0') {
 174                                         err(event->udev, "missing closing brace for format '%s'\n", src);
 175                                         goto out;
 176                                 }
 177                         }
 178                         if (i >= sizeof(attrbuf))
 179                                 goto out;
 180                         memcpy(attrbuf, from, i);
 181                         attrbuf[i] = '\0';
 182                         from += i+1;
 183                         attr = attrbuf;
 184                 } else {
 185                         attr = NULL;
 186                 }
 187
 188                 switch (type) {
 189                 case SUBST_DEVPATH:
 190                         l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
 191                         dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
 192                         break;
 193                 case SUBST_KERNEL:
 194                         l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
 195                         dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
 196                         break;
 197                 case SUBST_KERNEL_NUMBER:
 198                         if (udev_device_get_sysnum(dev) == NULL)
 199                                 break;
 200                         l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
 201                         dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
 202                         break;
 203                 case SUBST_ID:
 204                         if (event->dev_parent == NULL)
 205                                 break;
 206                         l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
 207                         dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
 208                         break;
 209                 case SUBST_DRIVER: {
 210                         const char *driver;
 211
 212                         if (event->dev_parent == NULL)
 213                                 break;
 214
 215                         driver = udev_device_get_driver(event->dev_parent);
 216                         if (driver == NULL)
 217                                 break;
 218                         l = util_strpcpy(&s, l, driver);
 219                         dbg(event->udev, "substitute driver '%s'\n", driver);
 220                         break;
 221                 }
 222                 case SUBST_MAJOR: {
 223                         char num[UTIL_PATH_SIZE];
 224
 225                         sprintf(num, "%d", major(udev_device_get_devnum(dev)));
 226                         l = util_strpcpy(&s, l, num);
 227                         dbg(event->udev, "substitute major number '%s'\n", num);
 228                         break;
 229                 }
 230                 case SUBST_MINOR: {
 231                         char num[UTIL_PATH_SIZE];
 232
 233                         sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
 234                         l = util_strpcpy(&s, l, num);
 235                         dbg(event->udev, "substitute minor number '%s'\n", num);
 236                         break;
 237                 }
 238                 case SUBST_RESULT: {
 239                         char *rest;
 240                         int i;
 241
 242                         if (event->program_result == NULL)
 243                                 break;
 244                         /* get part part of the result string */
 245                         i = 0;
 246                         if (attr != NULL)
 247                                 i = strtoul(attr, &rest, 10);
 248                         if (i > 0) {
 249                                 char result[UTIL_PATH_SIZE];
 250                                 char tmp[UTIL_PATH_SIZE];
 251                                 char *cpos;
 252
 253                                 dbg(event->udev, "request part #%d of result string\n", i);
 254                                 util_strscpy(result, sizeof(result), event->program_result);
 255                                 cpos = result;
 256                                 while (--i) {
 257                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 258                                                 cpos++;
 259                                         while (isspace(cpos[0]))
 260                                                 cpos++;
 261                                 }
 262                                 if (i > 0) {
 263                                         err(event->udev, "requested part of result string not found\n");
 264                                         break;
 265                                 }
 266                                 util_strscpy(tmp, sizeof(tmp), cpos);
 267                                 /* %{2+}c copies the whole string from the second part on */
 268                                 if (rest[0] != '+') {
 269                                         cpos = strchr(tmp, ' ');
 270                                         if (cpos)
 271                                                 cpos[0] = '\0';
 272                                 }
 273                                 l = util_strpcpy(&s, l, tmp);
 274                                 dbg(event->udev, "substitute part of result string '%s'\n", tmp);
 275                         } else {
 276                                 l = util_strpcpy(&s, l, event->program_result);
 277                                 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
 278                         }
 279                         break;
 280                 }
 281                 case SUBST_ATTR: {
 282                         const char *value = NULL;
 283                         char vbuf[UTIL_NAME_SIZE];
 284                         size_t len;
 285                         int count;
 286
 287                         if (attr == NULL) {
 288                                 err(event->udev, "missing file parameter for attr\n");
 289                                 break;
 290                         }
 291
 292                         /* try to read the value specified by "[dmi/id]product_name" */
 293                         if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
 294                                 value = vbuf;
 295
 296                         /* try to read the attribute the device */
 297                         if (value == NULL)
 298                                 value = udev_device_get_sysattr_value(event->dev, attr);
 299
 300                         /* try to read the attribute of the parent device, other matches have selected */
 301                         if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
 302                                 value = udev_device_get_sysattr_value(event->dev_parent, attr);
 303
 304                         if (value == NULL)
 305                                 break;
 306
 307                         /* strip trailing whitespace, and replace unwanted characters */
 308                         if (value != vbuf)
 309                                 util_strscpy(vbuf, sizeof(vbuf), value);
 310                         len = strlen(vbuf);
 311                         while (len > 0 && isspace(vbuf[--len]))
 312                                 vbuf[len] = '\0';
 313                         count = udev_util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 314                         if (count > 0)
 315                                 info(event->udev, "%i character(s) replaced\n" , count);
 316                         l = util_strpcpy(&s, l, vbuf);
 317                         dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
 318                         break;
 319                 }
 320                 case SUBST_PARENT: {
 321                         struct udev_device *dev_parent;
 322                         const char *devnode;
 323
 324                         dev_parent = udev_device_get_parent(event->dev);
 325                         if (dev_parent == NULL)
 326                                 break;
 327                                 devnode = udev_device_get_devnode(dev_parent);
 328                         if (devnode != NULL) {
 329                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 330
 331                                 l = util_strpcpy(&s, l, &devnode[devlen]);
 332                                 dbg(event->udev, "found parent '%s', got node name '%s'\n",
 333                                     udev_device_get_syspath(dev_parent), &devnode[devlen]);
 334                         }
 335                         break;
 336                 }
 337                 case SUBST_TEMP_NODE: {
 338                         dev_t devnum;
 339                         struct stat statbuf;
 340                         char filename[UTIL_PATH_SIZE];
 341                         const char *devtype;
 342
 343                         if (event->tmp_node != NULL) {
 344                                 l = util_strpcpy(&s, l, event->tmp_node);
 345                                 dbg(event->udev, "tempnode: return earlier created one\n");
 346                                 break;
 347                         }
 348                         devnum = udev_device_get_devnum(dev);
 349                         if (major(devnum) == 0)
 350                                 break;
 351                         /* lookup kernel provided node */
 352                         if (udev_device_get_knodename(dev) != NULL) {
 353                                 util_strscpyl(filename, sizeof(filename),
 354                                               udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
 355                                 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 356                                         l = util_strpcpy(&s, l, filename);
 357                                         dbg(event->udev, "tempnode: return kernel node\n");
 358                                         break;
 359                                 }
 360                         }
 361                         /* lookup /dev/{char,block}/<maj>:<min> */
 362                         if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
 363                                 devtype = "block";
 364                         else
 365                                 devtype = "char";
 366                         snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
 367                                  udev_get_dev_path(event->udev), devtype,
 368                                  major(udev_device_get_devnum(dev)),
 369                                  minor(udev_device_get_devnum(dev)));
 370                         if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 371                                 l = util_strpcpy(&s, l, filename);
 372                                 dbg(event->udev, "tempnode: return maj:min node\n");
 373                                 break;
 374                         }
 375                         /* create temporary node */
 376                         dbg(event->udev, "tempnode: create temp node\n");
 377                         asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
 378                                  udev_get_dev_path(event->udev), devtype,
 379                                  major(udev_device_get_devnum(dev)),
 380                                  minor(udev_device_get_devnum(dev)));
 381                         if (event->tmp_node == NULL)
 382                                 break;
 383                         udev_node_mknod(dev, event->tmp_node, 0600, 0, 0);
 384                         l = util_strpcpy(&s, l, event->tmp_node);
 385                         break;
 386                 }
 387                 case SUBST_NAME:
 388                         if (event->name != NULL) {
 389                                 l = util_strpcpy(&s, l, event->name);
 390                                 dbg(event->udev, "substitute name '%s'\n", event->name);
 391                         } else {
 392                                 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
 393                                 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
 394                         }
 395                         break;
 396                 case SUBST_LINKS: {
 397                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 398                         struct udev_list_entry *list_entry;
 399
 400                         list_entry = udev_device_get_devlinks_list_entry(dev);
 401                         if (list_entry == NULL)
 402                                 break;
 403                         l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
 404                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 405                                 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
 406                         break;
 407                 }
 408                 case SUBST_ROOT:
 409                         l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
 410                         dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
 411                         break;
 412                 case SUBST_SYS:
 413                         l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
 414                         dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
 415                         break;
 416                 case SUBST_ENV:
 417                         if (attr == NULL) {
 418                                 dbg(event->udev, "missing attribute\n");
 419                                 break;
 420                         } else {
 421                                 const char *value;
 422
 423                                 value = udev_device_get_property_value(event->dev, attr);
 424                                 if (value == NULL)
 425                                         break;
 426                                 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
 427                                 l = util_strpcpy(&s, l, value);
 428                                 break;
 429                         }
 430                 default:
 431                         err(event->udev, "unknown substitution type=%i\n", type);
 432                         break;
 433                 }
 434         }
 435
 436 out:
 437         s[0] = '\0';
 438         dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
 439         return l;
 440 }
 441
 442 static void rename_netif_kernel_log(struct ifreq ifr)
 443 {
 444         int klog;
 445         FILE *f;
 446
 447         klog = open("/dev/kmsg", O_WRONLY);
 448         if (klog < 0)
 449                 return;
 450
 451         f = fdopen(klog, "w");
 452         if (f == NULL) {
 453                 close(klog);
 454                 return;
 455         }
 456
 457         fprintf(f, "<30>udev[%u]: renamed network interface %s to %s\n",
 458                 getpid(), ifr.ifr_name, ifr.ifr_newname);
 459         fclose(f);
 460 }
 461
 462 static int rename_netif(struct udev_event *event)
 463 {
 464         struct udev_device *dev = event->dev;
 465         int sk;
 466         struct ifreq ifr;
 467         int loop;
 468         int err;
 469
 470         info(event->udev, "changing net interface name from '%s' to '%s'\n",
 471              udev_device_get_sysname(dev), event->name);
 472
 473         sk = socket(PF_INET, SOCK_DGRAM, 0);
 474         if (sk < 0) {
 475                 err = -errno;
 476                 err(event->udev, "error opening socket: %m\n");
 477                 return err;
 478         }
 479
 480         memset(&ifr, 0x00, sizeof(struct ifreq));
 481         util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
 482         util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
 483         err = ioctl(sk, SIOCSIFNAME, &ifr);
 484         if (err == 0) {
 485                 rename_netif_kernel_log(ifr);
 486                 goto out;
 487         }
 488
 489         /* keep trying if the destination interface name already exists */
 490         err = -errno;
 491         if (err != -EEXIST)
 492                 goto out;
 493
 494         /* free our own name, another process may wait for us */
 495         util_strscpyl(ifr.ifr_newname, IFNAMSIZ, udev_device_get_sysname(dev), "-", event->name, NULL);
 496         err = ioctl(sk, SIOCSIFNAME, &ifr);
 497         if (err < 0) {
 498                 err = -errno;
 499                 goto out;
 500         }
 501
 502         /* log temporary name */
 503         rename_netif_kernel_log(ifr);
 504
 505         /* wait a maximum of 90 seconds for our target to become available */
 506         util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
 507         util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
 508         loop = 90 * 20;
 509         while (loop--) {
 510                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
 511
 512                 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
 513                     event->name, (90 * 20) - loop);
 514                 nanosleep(&duration, NULL);
 515
 516                 err = ioctl(sk, SIOCSIFNAME, &ifr);
 517                 if (err == 0) {
 518                         rename_netif_kernel_log(ifr);
 519                         break;
 520                 }
 521                 err = -errno;
 522                 if (err != -EEXIST)
 523                         break;
 524         }
 525
 526 out:
 527         if (err < 0)
 528                 err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
 529         close(sk);
 530         return err;
 531 }
 532
 533 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
 534 {
 535         struct udev_device *dev = event->dev;
 536         int err = 0;
 537
 538         if (udev_device_get_subsystem(dev) == NULL)
 539                 return -1;
 540
 541         if (strcmp(udev_device_get_action(dev), "remove") == 0) {
 542                 udev_device_read_db(dev, NULL);
 543                 udev_device_delete_db(dev);
 544                 udev_device_tag_index(dev, NULL, false);
 545
 546                 if (major(udev_device_get_devnum(dev)) != 0)
 547                         udev_watch_end(event->udev, dev);
 548
 549                 udev_rules_apply_to_event(rules, event);
 550
 551                 if (major(udev_device_get_devnum(dev)) != 0)
 552                         err = udev_node_remove(dev);
 553         } else {
 554                 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
 555                 if (event->dev_db != NULL) {
 556                         udev_device_read_db(event->dev_db, NULL);
 557                         udev_device_set_info_loaded(event->dev_db);
 558
 559                         /* disable watch during event processing */
 560                         if (major(udev_device_get_devnum(dev)) != 0)
 561                                 udev_watch_end(event->udev, event->dev_db);
 562                 }
 563
 564                 udev_rules_apply_to_event(rules, event);
 565
 566                 /* rename a new network interface, if needed */
 567                 if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
 568                     event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
 569                         char syspath[UTIL_PATH_SIZE];
 570                         char *pos;
 571
 572                         err = rename_netif(event);
 573                         if (err == 0) {
 574                                 info(event->udev, "renamed netif to '%s'\n", event->name);
 575
 576                                 /* delete stale db file */
 577                                 udev_device_delete_db(dev);
 578                                 udev_device_tag_index(dev, NULL, false);
 579
 580                                 /* remember old name */
 581                                 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
 582
 583                                 /* now change the devpath, because the kernel device name has changed */
 584                                 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
 585                                 pos = strrchr(syspath, '/');
 586                                 if (pos != NULL) {
 587                                         pos++;
 588                                         util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
 589                                         udev_device_set_syspath(event->dev, syspath);
 590                                         udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
 591                                         info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
 592                                 }
 593                         }
 594                 }
 595
 596                 if (major(udev_device_get_devnum(dev)) != 0) {
 597                         char filename[UTIL_PATH_SIZE];
 598
 599                         if (event->tmp_node != NULL) {
 600                                 info(event->udev, "cleanup temporary device node\n");
 601                                 util_unlink_secure(event->udev, event->tmp_node);
 602                                 free(event->tmp_node);
 603                                 event->tmp_node = NULL;
 604                         }
 605
 606                         /* no rule, use kernel provided name */
 607                         if (event->name == NULL) {
 608                                 if (udev_device_get_knodename(dev) != NULL) {
 609                                         event->name = strdup(udev_device_get_knodename(dev));
 610                                         info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
 611                                 } else {
 612                                         event->name = strdup(udev_device_get_sysname(event->dev));
 613                                         info(event->udev, "no node name set, will use device name '%s'\n", event->name);
 614                                 }
 615                         }
 616
 617                         if (event->name == NULL || event->name[0] == '\0') {
 618                                 udev_device_delete_db(dev);
 619                                 udev_device_tag_index(dev, NULL, false);
 620                                 udev_device_unref(event->dev_db);
 621                                 err = -ENOMEM;
 622                                 err(event->udev, "no node name, something went wrong, ignoring\n");
 623                                 goto out;
 624                         }
 625
 626                         if (udev_device_get_knodename(dev) != NULL && strcmp(udev_device_get_knodename(dev), event->name) != 0)
 627                                 err(event->udev, "kernel-provided name '%s' and NAME= '%s' disagree, "
 628                                     "please use SYMLINK+= or change the kernel to provide the proper name\n",
 629                                     udev_device_get_knodename(dev), event->name);
 630
 631                         /* set device node name */
 632                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
 633                         udev_device_set_devnode(dev, filename);
 634
 635                         /* remove/update possible left-over symlinks from old database entry */
 636                         if (event->dev_db != NULL)
 637                                 udev_node_update_old_links(dev, event->dev_db);
 638
 639                         /* change default 0600 to 0660 if a group is assigned */
 640                         if (event->mode == 0600 && event->gid > 0)
 641                                 event->mode = 0660;
 642
 643                         err = udev_node_add(dev, event->mode, event->uid, event->gid);
 644                 }
 645
 646                 /* preserve old, or get new initialization timestamp */
 647                 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
 648                         udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
 649                 else
 650                         udev_device_set_usec_initialized(event->dev, usec_monotonic());
 651
 652                 /* (re)write database file */
 653                 udev_device_update_db(dev);
 654                 udev_device_tag_index(dev, event->dev_db, true);
 655                 udev_device_set_is_initialized(dev);
 656
 657                 udev_device_unref(event->dev_db);
 658                 event->dev_db = NULL;
 659         }
 660 out:
 661         return err;
 662 }
 663
 664 int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
 665 {
 666         struct udev_list_entry *list_entry;
 667         int err = 0;
 668
 669         dbg(event->udev, "executing run list\n");
 670         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 671                 const char *cmd = udev_list_entry_get_name(list_entry);
 672
 673                 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
 674                         struct udev_monitor *monitor;
 675
 676                         monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
 677                         if (monitor == NULL)
 678                                 continue;
 679                         udev_monitor_send_device(monitor, NULL, event->dev);
 680                         udev_monitor_unref(monitor);
 681                 } else {
 682                         char program[UTIL_PATH_SIZE];
 683                         char **envp;
 684
 685                         udev_event_apply_format(event, cmd, program, sizeof(program));
 686                         envp = udev_device_get_properties_envp(event->dev);
 687                         if (event->exec_delay > 0) {
 688                                 info(event->udev, "delay execution of '%s'\n", program);
 689                                 sleep(event->exec_delay);
 690                         }
 691                         if (util_run_program(event->udev, program, envp, NULL, 0, NULL, sigmask, true) != 0) {
 692                                 if (udev_list_entry_get_flags(list_entry))
 693                                         err = -1;
 694                         }
 695                 }
 696         }
 697         return err;
 698 }