udev/udev-event.c

   1 /*
   2  * Copyright (C) 2003-2009 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 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
  61 {
  62         struct udev_device *dev = event->dev;
  63         enum subst_type {
  64                 SUBST_UNKNOWN,
  65                 SUBST_TEMP_NODE,
  66                 SUBST_ATTR,
  67                 SUBST_ENV,
  68                 SUBST_KERNEL,
  69                 SUBST_KERNEL_NUMBER,
  70                 SUBST_DRIVER,
  71                 SUBST_DEVPATH,
  72                 SUBST_ID,
  73                 SUBST_MAJOR,
  74                 SUBST_MINOR,
  75                 SUBST_RESULT,
  76                 SUBST_PARENT,
  77                 SUBST_NAME,
  78                 SUBST_LINKS,
  79                 SUBST_ROOT,
  80                 SUBST_SYS,
  81         };
  82         static const struct subst_map {
  83                 char *name;
  84                 char fmt;
  85                 enum subst_type type;
  86         } map[] = {
  87                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
  88                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
  89                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
  90                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
  91                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
  92                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
  93                 { .name = "driver",     .fmt = 'd',     .type = SUBST_DRIVER },
  94                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
  95                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
  96                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
  97                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
  98                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
  99                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 100                 { .name = "name",       .fmt = 'D',     .type = SUBST_NAME },
 101                 { .name = "links",      .fmt = 'L',     .type = SUBST_LINKS },
 102                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 103                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 104         };
 105         const char *from;
 106         char *s;
 107         size_t l;
 108
 109         from = src;
 110         s = dest;
 111         l = size;
 112
 113         while (1) {
 114                 enum subst_type type = SUBST_UNKNOWN;
 115                 char attrbuf[UTIL_PATH_SIZE];
 116                 char *attr = NULL;
 117
 118                 while (from[0] != '\0') {
 119                         if (from[0] == '$') {
 120                                 /* substitute named variable */
 121                                 unsigned int i;
 122
 123                                 if (from[1] == '$') {
 124                                         from++;
 125                                         goto copy;
 126                                 }
 127
 128                                 for (i = 0; i < ARRAY_SIZE(map); i++) {
 129                                         if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
 130                                                 type = map[i].type;
 131                                                 from += strlen(map[i].name)+1;
 132                                                 dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
 133                                                 goto subst;
 134                                         }
 135                                 }
 136                         } else if (from[0] == '%') {
 137                                 /* substitute format char */
 138                                 unsigned int i;
 139
 140                                 if (from[1] == '%') {
 141                                         from++;
 142                                         goto copy;
 143                                 }
 144
 145                                 for (i = 0; i < ARRAY_SIZE(map); i++) {
 146                                         if (from[1] == map[i].fmt) {
 147                                                 type = map[i].type;
 148                                                 from += 2;
 149                                                 dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
 150                                                 goto subst;
 151                                         }
 152                                 }
 153                         }
 154 copy:
 155                         /* copy char */
 156                         if (l == 0)
 157                                 goto out;
 158                         s[0] = from[0];
 159                         from++;
 160                         s++;
 161                         l--;
 162                 }
 163
 164                 goto out;
 165 subst:
 166                 /* extract possible $format{attr} */
 167                 if (from[0] == '{') {
 168                         unsigned int i;
 169
 170                         from++;
 171                         for (i = 0; from[i] != '}'; i++) {
 172                                 if (from[i] == '\0') {
 173                                         err(event->udev, "missing closing brace for format '%s'\n", src);
 174                                         goto out;
 175                                 }
 176                         }
 177                         if (i >= sizeof(attrbuf))
 178                                 goto out;
 179                         memcpy(attrbuf, from, i);
 180                         attrbuf[i] = '\0';
 181                         from += i+1;
 182                         attr = attrbuf;
 183                 } else {
 184                         attr = NULL;
 185                 }
 186
 187                 switch (type) {
 188                 case SUBST_DEVPATH:
 189                         l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
 190                         dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
 191                         break;
 192                 case SUBST_KERNEL:
 193                         l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
 194                         dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
 195                         break;
 196                 case SUBST_KERNEL_NUMBER:
 197                         if (udev_device_get_sysnum(dev) == NULL)
 198                                 break;
 199                         l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
 200                         dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
 201                         break;
 202                 case SUBST_ID:
 203                         if (event->dev_parent == NULL)
 204                                 break;
 205                         l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
 206                         dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
 207                         break;
 208                 case SUBST_DRIVER: {
 209                         const char *driver;
 210
 211                         if (event->dev_parent == NULL)
 212                                 break;
 213
 214                         driver = udev_device_get_driver(event->dev_parent);
 215                         if (driver == NULL)
 216                                 break;
 217                         l = util_strpcpy(&s, l, driver);
 218                         dbg(event->udev, "substitute driver '%s'\n", driver);
 219                         break;
 220                 }
 221                 case SUBST_MAJOR: {
 222                         char num[UTIL_PATH_SIZE];
 223
 224                         sprintf(num, "%d", major(udev_device_get_devnum(dev)));
 225                         l = util_strpcpy(&s, l, num);
 226                         dbg(event->udev, "substitute major number '%s'\n", num);
 227                         break;
 228                 }
 229                 case SUBST_MINOR: {
 230                         char num[UTIL_PATH_SIZE];
 231
 232                         sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
 233                         l = util_strpcpy(&s, l, num);
 234                         dbg(event->udev, "substitute minor number '%s'\n", num);
 235                         break;
 236                 }
 237                 case SUBST_RESULT: {
 238                         char *rest;
 239                         int i;
 240
 241                         if (event->program_result == NULL)
 242                                 break;
 243                         /* get part part of the result string */
 244                         i = 0;
 245                         if (attr != NULL)
 246                                 i = strtoul(attr, &rest, 10);
 247                         if (i > 0) {
 248                                 char result[UTIL_PATH_SIZE];
 249                                 char tmp[UTIL_PATH_SIZE];
 250                                 char *cpos;
 251
 252                                 dbg(event->udev, "request part #%d of result string\n", i);
 253                                 util_strscpy(result, sizeof(result), event->program_result);
 254                                 cpos = result;
 255                                 while (--i) {
 256                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 257                                                 cpos++;
 258                                         while (isspace(cpos[0]))
 259                                                 cpos++;
 260                                 }
 261                                 if (i > 0) {
 262                                         err(event->udev, "requested part of result string not found\n");
 263                                         break;
 264                                 }
 265                                 util_strscpy(tmp, sizeof(tmp), cpos);
 266                                 /* %{2+}c copies the whole string from the second part on */
 267                                 if (rest[0] != '+') {
 268                                         cpos = strchr(tmp, ' ');
 269                                         if (cpos)
 270                                                 cpos[0] = '\0';
 271                                 }
 272                                 l = util_strpcpy(&s, l, tmp);
 273                                 dbg(event->udev, "substitute part of result string '%s'\n", tmp);
 274                         } else {
 275                                 l = util_strpcpy(&s, l, event->program_result);
 276                                 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
 277                         }
 278                         break;
 279                 }
 280                 case SUBST_ATTR: {
 281                         const char *value = NULL;
 282                         char vbuf[UTIL_NAME_SIZE];
 283                         size_t len;
 284                         int count;
 285
 286                         if (attr == NULL) {
 287                                 err(event->udev, "missing file parameter for attr\n");
 288                                 break;
 289                         }
 290
 291                         /* try to read the value specified by "[dmi/id]product_name" */
 292                         if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
 293                                 value = vbuf;
 294
 295                         /* try to read the attribute the device */
 296                         if (value == NULL)
 297                                 value = udev_device_get_sysattr_value(event->dev, attr);
 298
 299                         /* try to read the attribute of the parent device, other matches have selected */
 300                         if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
 301                                 value = udev_device_get_sysattr_value(event->dev_parent, attr);
 302
 303                         if (value == NULL)
 304                                 break;
 305
 306                         /* strip trailing whitespace, and replace unwanted characters */
 307                         if (value != vbuf)
 308                                 util_strscpy(vbuf, sizeof(vbuf), value);
 309                         len = strlen(vbuf);
 310                         while (len > 0 && isspace(vbuf[--len]))
 311                                 vbuf[len] = '\0';
 312                         count = udev_util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 313                         if (count > 0)
 314                                 info(event->udev, "%i character(s) replaced\n" , count);
 315                         l = util_strpcpy(&s, l, vbuf);
 316                         dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
 317                         break;
 318                 }
 319                 case SUBST_PARENT: {
 320                         struct udev_device *dev_parent;
 321                         const char *devnode;
 322
 323                         dev_parent = udev_device_get_parent(event->dev);
 324                         if (dev_parent == NULL)
 325                                 break;
 326                                 devnode = udev_device_get_devnode(dev_parent);
 327                         if (devnode != NULL) {
 328                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 329
 330                                 l = util_strpcpy(&s, l, &devnode[devlen]);
 331                                 dbg(event->udev, "found parent '%s', got node name '%s'\n",
 332                                     udev_device_get_syspath(dev_parent), &devnode[devlen]);
 333                         }
 334                         break;
 335                 }
 336                 case SUBST_TEMP_NODE: {
 337                         dev_t devnum;
 338                         struct stat statbuf;
 339                         char filename[UTIL_PATH_SIZE];
 340                         const char *devtype;
 341
 342                         if (event->tmp_node != NULL) {
 343                                 l = util_strpcpy(&s, l, event->tmp_node);
 344                                 dbg(event->udev, "tempnode: return earlier created one\n");
 345                                 break;
 346                         }
 347                         devnum = udev_device_get_devnum(dev);
 348                         if (major(devnum) == 0)
 349                                 break;
 350                         /* lookup kernel provided node */
 351                         if (udev_device_get_knodename(dev) != NULL) {
 352                                 util_strscpyl(filename, sizeof(filename),
 353                                               udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
 354                                 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 355                                         l = util_strpcpy(&s, l, filename);
 356                                         dbg(event->udev, "tempnode: return kernel node\n");
 357                                         break;
 358                                 }
 359                         }
 360                         /* lookup /dev/{char,block}/<maj>:<min> */
 361                         if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
 362                                 devtype = "block";
 363                         else
 364                                 devtype = "char";
 365                         snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
 366                                  udev_get_dev_path(event->udev), devtype,
 367                                  major(udev_device_get_devnum(dev)),
 368                                  minor(udev_device_get_devnum(dev)));
 369                         if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
 370                                 l = util_strpcpy(&s, l, filename);
 371                                 dbg(event->udev, "tempnode: return maj:min node\n");
 372                                 break;
 373                         }
 374                         /* create temporary node */
 375                         dbg(event->udev, "tempnode: create temp node\n");
 376                         asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
 377                                  udev_get_dev_path(event->udev), devtype,
 378                                  major(udev_device_get_devnum(dev)),
 379                                  minor(udev_device_get_devnum(dev)));
 380                         if (event->tmp_node == NULL)
 381                                 break;
 382                         udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
 383                         l = util_strpcpy(&s, l, event->tmp_node);
 384                         break;
 385                 }
 386                 case SUBST_NAME:
 387                         if (event->name != NULL) {
 388                                 l = util_strpcpy(&s, l, event->name);
 389                                 dbg(event->udev, "substitute name '%s'\n", event->name);
 390                         } else {
 391                                 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
 392                                 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
 393                         }
 394                         break;
 395                 case SUBST_LINKS: {
 396                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
 397                         struct udev_list_entry *list_entry;
 398
 399                         list_entry = udev_device_get_devlinks_list_entry(dev);
 400                         if (list_entry == NULL)
 401                                 break;
 402                         l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
 403                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 404                                 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
 405                         break;
 406                 }
 407                 case SUBST_ROOT:
 408                         l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
 409                         dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
 410                         break;
 411                 case SUBST_SYS:
 412                         l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
 413                         dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
 414                         break;
 415                 case SUBST_ENV:
 416                         if (attr == NULL) {
 417                                 dbg(event->udev, "missing attribute\n");
 418                                 break;
 419                         } else {
 420                                 const char *value;
 421
 422                                 value = udev_device_get_property_value(event->dev, attr);
 423                                 if (value == NULL)
 424                                         break;
 425                                 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
 426                                 l = util_strpcpy(&s, l, value);
 427                                 break;
 428                         }
 429                 default:
 430                         err(event->udev, "unknown substitution type=%i\n", type);
 431                         break;
 432                 }
 433         }
 434
 435 out:
 436         s[0] = '\0';
 437         dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
 438         return l;
 439 }
 440
 441 static void rename_netif_kernel_log(struct ifreq ifr)
 442 {
 443         int klog;
 444         FILE *f;
 445
 446         klog = open("/dev/kmsg", O_WRONLY);
 447         if (klog < 0)
 448                 return;
 449
 450         f = fdopen(klog, "w");
 451         if (f == NULL) {
 452                 close(klog);
 453                 return;
 454         }
 455
 456         fprintf(f, "<6>udev: renamed network interface %s to %s\n",
 457                 ifr.ifr_name, ifr.ifr_newname);
 458         fclose(f);
 459 }
 460
 461 static int rename_netif(struct udev_event *event)
 462 {
 463         struct udev_device *dev = event->dev;
 464         int sk;
 465         struct ifreq ifr;
 466         int err;
 467
 468         info(event->udev, "changing net interface name from '%s' to '%s'\n",
 469              udev_device_get_sysname(dev), event->name);
 470
 471         sk = socket(PF_INET, SOCK_DGRAM, 0);
 472         if (sk < 0) {
 473                 err(event->udev, "error opening socket: %m\n");
 474                 return -1;
 475         }
 476
 477         memset(&ifr, 0x00, sizeof(struct ifreq));
 478         util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
 479         util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
 480         err = ioctl(sk, SIOCSIFNAME, &ifr);
 481         if (err == 0)
 482                 rename_netif_kernel_log(ifr);
 483         else {
 484                 int loop;
 485
 486                 /* see if the destination interface name already exists */
 487                 if (errno != EEXIST) {
 488                         err(event->udev, "error changing netif name %s to %s: %m\n",
 489                             ifr.ifr_name, ifr.ifr_newname);
 490                         goto exit;
 491                 }
 492
 493                 /* free our own name, another process may wait for us */
 494                 util_strscpy(ifr.ifr_newname, IFNAMSIZ, udev_device_get_sysname(dev));
 495                 util_strscpy(ifr.ifr_newname, IFNAMSIZ, "_rename");
 496                 err = ioctl(sk, SIOCSIFNAME, &ifr);
 497                 if (err != 0) {
 498                         err(event->udev, "error changing netif name %s to %s: %m\n",
 499                             ifr.ifr_name, ifr.ifr_newname);
 500                         goto exit;
 501                 }
 502
 503                 /* wait 90 seconds for our target to become available */
 504                 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
 505                 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
 506                 loop = 90 * 20;
 507                 while (loop--) {
 508                         err = ioctl(sk, SIOCSIFNAME, &ifr);
 509                         if (err == 0) {
 510                                 rename_netif_kernel_log(ifr);
 511                                 break;
 512                         }
 513
 514                         if (errno != EEXIST) {
 515                                 err(event->udev, "error changing net interface name %s to %s: %m\n",
 516                                     ifr.ifr_name, ifr.ifr_newname);
 517                                 break;
 518                         }
 519                         dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
 520                             event->name, (90 * 20) - loop);
 521                         usleep(1000 * 1000 / 20);
 522                 }
 523         }
 524 exit:
 525         close(sk);
 526         return err;
 527 }
 528
 529 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
 530 {
 531         struct udev_device *dev = event->dev;
 532         int err = 0;
 533
 534         if (udev_device_get_devpath_old(dev) != NULL) {
 535                 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
 536                         info(event->udev, "moved database from '%s' to '%s'\n",
 537                              udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
 538         }
 539
 540         /* add device node */
 541         if (major(udev_device_get_devnum(dev)) != 0 &&
 542             (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
 543                 char filename[UTIL_PATH_SIZE];
 544                 struct udev_device *dev_old;
 545                 int delete_kdevnode = 0;
 546
 547                 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
 548
 549                 /* read old database entry */
 550                 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
 551                 if (dev_old != NULL) {
 552                         udev_device_read_db(dev_old);
 553                         udev_device_set_info_loaded(dev_old);
 554
 555                         /* disable watch during event processing */
 556                         udev_watch_end(event->udev, dev_old);
 557                 }
 558
 559                 udev_rules_apply_to_event(rules, event);
 560                 if (event->tmp_node != NULL) {
 561                         dbg(event->udev, "cleanup temporary device node\n");
 562                         util_unlink_secure(event->udev, event->tmp_node);
 563                         free(event->tmp_node);
 564                         event->tmp_node = NULL;
 565                 }
 566
 567                 if (event->ignore_device) {
 568                         info(event->udev, "device event will be ignored\n");
 569                         delete_kdevnode = 1;
 570                         goto exit_add;
 571                 }
 572
 573                 if (event->name != NULL && event->name[0] == '\0') {
 574                         info(event->udev, "device node creation suppressed\n");
 575                         delete_kdevnode = 1;
 576                         goto exit_add;
 577                 }
 578
 579                 /* if rule given name disagrees with kernel node name, delete kernel node */
 580                 if (event->name != NULL && udev_device_get_knodename(dev) != NULL) {
 581                         if (strcmp(event->name, udev_device_get_knodename(dev)) != 0)
 582                                 delete_kdevnode = 1;
 583                 }
 584
 585                 /* no rule, use kernel provided name */
 586                 if (event->name == NULL) {
 587                         if (udev_device_get_knodename(dev) != NULL) {
 588                                 event->name = strdup(udev_device_get_knodename(dev));
 589                                 info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
 590                         } else {
 591                                 event->name = strdup(udev_device_get_sysname(event->dev));
 592                                 info(event->udev, "no node name set, will use device name '%s'\n", event->name);
 593                         }
 594                 }
 595
 596                 /* something went wrong */
 597                 if (event->name == NULL) {
 598                         err(event->udev, "no node name for '%s'\n", udev_device_get_sysname(event->dev));
 599                         goto exit_add;
 600                 }
 601
 602                 /* set device node name */
 603                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
 604                 udev_device_set_devnode(dev, filename);
 605
 606                 /* write current database entry */
 607                 udev_device_update_db(dev);
 608
 609                 /* remove/update possible left-over symlinks from old database entry */
 610                 if (dev_old != NULL)
 611                         udev_node_update_old_links(dev, dev_old);
 612
 613                 /* create new node and symlinks */
 614                 err = udev_node_add(dev, event->mode, event->uid, event->gid);
 615 exit_add:
 616                 if (delete_kdevnode && udev_device_get_knodename(dev) != NULL) {
 617                         struct stat stats;
 618
 619                         util_strscpyl(filename, sizeof(filename),
 620                                       udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
 621                         if (stat(filename, &stats) == 0 && stats.st_rdev == udev_device_get_devnum(dev)) {
 622                                 unlink(filename);
 623                                 util_delete_path(event->udev, filename);
 624                                 info(event->udev, "removed kernel created node '%s'\n", filename);
 625                         }
 626                 }
 627                 udev_device_unref(dev_old);
 628                 goto exit;
 629         }
 630
 631         /* add netif */
 632         if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
 633                 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
 634                 udev_device_delete_db(dev);
 635
 636                 udev_rules_apply_to_event(rules, event);
 637                 if (event->ignore_device) {
 638                         info(event->udev, "device event will be ignored\n");
 639                         goto exit;
 640                 }
 641                 if (event->name == NULL)
 642                         goto exit;
 643
 644                 /* look if we want to change the name of the netif */
 645                 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
 646                         char syspath[UTIL_PATH_SIZE];
 647                         char *pos;
 648
 649                         err = rename_netif(event);
 650                         if (err != 0)
 651                                 goto exit;
 652                         info(event->udev, "renamed netif to '%s'\n", event->name);
 653
 654                         /* remember old name */
 655                         udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
 656
 657                         /* now change the devpath, because the kernel device name has changed */
 658                         util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
 659                         pos = strrchr(syspath, '/');
 660                         if (pos != NULL) {
 661                                 pos++;
 662                                 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
 663                                 udev_device_set_syspath(event->dev, syspath);
 664                                 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
 665                                 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
 666                         }
 667                 }
 668                 udev_device_update_db(dev);
 669                 goto exit;
 670         }
 671
 672         /* remove device node */
 673         if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
 674                 /* import database entry and delete it */
 675                 udev_device_read_db(dev);
 676                 udev_device_set_info_loaded(dev);
 677                 udev_device_delete_db(dev);
 678
 679                 /* remove watch */
 680                 udev_watch_end(event->udev, dev);
 681
 682                 if (udev_device_get_devnode(dev) == NULL) {
 683                         char devnode[UTIL_PATH_SIZE];
 684
 685                         info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
 686                              udev_device_get_syspath(dev), udev_device_get_sysname(dev));
 687                         util_strscpyl(devnode, sizeof(devnode),
 688                                       udev_get_dev_path(event->udev), "/", udev_device_get_sysname(dev), NULL);
 689                         udev_device_set_devnode(dev, devnode);
 690                 }
 691
 692                 udev_rules_apply_to_event(rules, event);
 693                 if (event->ignore_device) {
 694                         info(event->udev, "device event will be ignored\n");
 695                         goto exit;
 696                 }
 697
 698                 if (udev_device_get_ignore_remove(dev)) {
 699                         info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
 700                         goto exit;
 701                 }
 702
 703                 err = udev_node_remove(dev);
 704                 goto exit;
 705         }
 706
 707         /* default devices */
 708         udev_rules_apply_to_event(rules, event);
 709         if (event->ignore_device)
 710                 info(event->udev, "device event will be ignored\n");
 711
 712         if (strcmp(udev_device_get_action(dev), "remove") != 0)
 713                 udev_device_update_db(dev);
 714         else
 715                 udev_device_delete_db(dev);
 716 exit:
 717         return err;
 718 }
 719
 720 int udev_event_execute_run(struct udev_event *event)
 721 {
 722         struct udev_list_entry *list_entry;
 723         int err = 0;
 724
 725         dbg(event->udev, "executing run list\n");
 726         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 727                 const char *cmd = udev_list_entry_get_name(list_entry);
 728
 729                 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
 730                         struct udev_monitor *monitor;
 731
 732                         monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
 733                         if (monitor == NULL)
 734                                 continue;
 735                         udev_monitor_send_device(monitor, NULL, event->dev);
 736                         udev_monitor_unref(monitor);
 737                 } else {
 738                         char program[UTIL_PATH_SIZE];
 739                         char **envp;
 740
 741                         udev_event_apply_format(event, cmd, program, sizeof(program));
 742                         envp = udev_device_get_properties_envp(event->dev);
 743                         if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
 744                                 if (udev_list_entry_get_flag(list_entry))
 745                                         err = -1;
 746                         }
 747                 }
 748         }
 749         return err;
 750 }