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