src/udev/udev-event.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <net/if.h>
   7 #include <stddef.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11
  12 #include "sd-event.h"
  13
  14 #include "alloc-util.h"
  15 #include "device-private.h"
  16 #include "device-util.h"
  17 #include "fd-util.h"
  18 #include "format-util.h"
  19 #include "libudev-private.h"
  20 #include "netlink-util.h"
  21 #include "path-util.h"
  22 #include "process-util.h"
  23 #include "signal-util.h"
  24 #include "stdio-util.h"
  25 #include "string-util.h"
  26 #include "udev-builtin.h"
  27 #include "udev-node.h"
  28 #include "udev-watch.h"
  29 #include "udev.h"
  30
  31 typedef struct Spawn {
  32         const char *cmd;
  33         pid_t pid;
  34         usec_t timeout_warn_usec;
  35         usec_t timeout_usec;
  36         usec_t event_birth_usec;
  37         bool accept_failure;
  38         int fd_stdout;
  39         int fd_stderr;
  40         char *result;
  41         size_t result_size;
  42         size_t result_len;
  43 } Spawn;
  44
  45 struct udev_event *udev_event_new(sd_device *dev, usec_t exec_delay_usec, sd_netlink *rtnl) {
  46         struct udev_event *event;
  47
  48         assert(dev);
  49
  50         event = new(struct udev_event, 1);
  51         if (!event)
  52                 return NULL;
  53
  54         *event = (struct udev_event) {
  55                 .dev = sd_device_ref(dev),
  56                 .birth_usec = now(CLOCK_MONOTONIC),
  57                 .exec_delay_usec = exec_delay_usec,
  58                 .rtnl = sd_netlink_ref(rtnl),
  59         };
  60
  61         return event;
  62 }
  63
  64 struct udev_event *udev_event_free(struct udev_event *event) {
  65         void *p;
  66
  67         if (!event)
  68                 return NULL;
  69
  70         sd_device_unref(event->dev);
  71         sd_device_unref(event->dev_db_clone);
  72         sd_netlink_unref(event->rtnl);
  73         while ((p = hashmap_steal_first_key(event->run_list)))
  74                 free(p);
  75         hashmap_free(event->run_list);
  76         hashmap_free_free_free(event->seclabel_list);
  77         free(event->program_result);
  78         free(event->name);
  79
  80         return mfree(event);
  81 }
  82
  83 enum subst_type {
  84         SUBST_DEVNODE,
  85         SUBST_ATTR,
  86         SUBST_ENV,
  87         SUBST_KERNEL,
  88         SUBST_KERNEL_NUMBER,
  89         SUBST_DRIVER,
  90         SUBST_DEVPATH,
  91         SUBST_ID,
  92         SUBST_MAJOR,
  93         SUBST_MINOR,
  94         SUBST_RESULT,
  95         SUBST_PARENT,
  96         SUBST_NAME,
  97         SUBST_LINKS,
  98         SUBST_ROOT,
  99         SUBST_SYS,
 100 };
 101
 102 struct subst_map_entry {
 103         const char *name;
 104         const char fmt;
 105         enum subst_type type;
 106 };
 107
 108 static const struct subst_map_entry map[] = {
 109            { .name = "devnode",  .fmt = 'N', .type = SUBST_DEVNODE },
 110            { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
 111            { .name = "attr",     .fmt = 's', .type = SUBST_ATTR },
 112            { .name = "sysfs",    .fmt = 's', .type = SUBST_ATTR },
 113            { .name = "env",      .fmt = 'E', .type = SUBST_ENV },
 114            { .name = "kernel",   .fmt = 'k', .type = SUBST_KERNEL },
 115            { .name = "number",   .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
 116            { .name = "driver",   .fmt = 'd', .type = SUBST_DRIVER },
 117            { .name = "devpath",  .fmt = 'p', .type = SUBST_DEVPATH },
 118            { .name = "id",       .fmt = 'b', .type = SUBST_ID },
 119            { .name = "major",    .fmt = 'M', .type = SUBST_MAJOR },
 120            { .name = "minor",    .fmt = 'm', .type = SUBST_MINOR },
 121            { .name = "result",   .fmt = 'c', .type = SUBST_RESULT },
 122            { .name = "parent",   .fmt = 'P', .type = SUBST_PARENT },
 123            { .name = "name",     .fmt = 'D', .type = SUBST_NAME },
 124            { .name = "links",    .fmt = 'L', .type = SUBST_LINKS },
 125            { .name = "root",     .fmt = 'r', .type = SUBST_ROOT },
 126            { .name = "sys",      .fmt = 'S', .type = SUBST_SYS },
 127 };
 128
 129 static ssize_t subst_format_var(struct udev_event *event,
 130                                 const struct subst_map_entry *entry, char *attr,
 131                                 char *dest, size_t l) {
 132         sd_device *parent, *dev = event->dev;
 133         const char *val = NULL;
 134         char *s = dest;
 135         dev_t devnum;
 136         int r;
 137
 138         assert(entry);
 139
 140         switch (entry->type) {
 141         case SUBST_DEVPATH:
 142                 r = sd_device_get_devpath(dev, &val);
 143                 if (r < 0)
 144                         return r;
 145                 l = strpcpy(&s, l, val);
 146                 break;
 147         case SUBST_KERNEL:
 148                 r = sd_device_get_sysname(dev, &val);
 149                 if (r < 0)
 150                         return r;
 151                 l = strpcpy(&s, l, val);
 152                 break;
 153         case SUBST_KERNEL_NUMBER:
 154                 r = sd_device_get_sysnum(dev, &val);
 155                 if (r < 0)
 156                         return r == -ENOENT ? 0 : r;
 157                 l = strpcpy(&s, l, val);
 158                 break;
 159         case SUBST_ID:
 160                 if (!event->dev_parent)
 161                         return 0;
 162                 r = sd_device_get_sysname(event->dev_parent, &val);
 163                 if (r < 0)
 164                         return r;
 165                 l = strpcpy(&s, l, val);
 166                 break;
 167         case SUBST_DRIVER:
 168                 if (!event->dev_parent)
 169                         return 0;
 170                 r = sd_device_get_driver(event->dev_parent, &val);
 171                 if (r < 0)
 172                         return r == -ENOENT ? 0 : r;
 173                 l = strpcpy(&s, l, val);
 174                 break;
 175         case SUBST_MAJOR:
 176         case SUBST_MINOR: {
 177                 char buf[DECIMAL_STR_MAX(unsigned)];
 178
 179                 r = sd_device_get_devnum(dev, &devnum);
 180                 if (r < 0 && r != -ENOENT)
 181                         return r;
 182                 xsprintf(buf, "%u", r < 0 ? 0 : entry->type == SUBST_MAJOR ? major(devnum) : minor(devnum));
 183                 l = strpcpy(&s, l, buf);
 184                 break;
 185         }
 186         case SUBST_RESULT: {
 187                 char *rest;
 188                 int i;
 189
 190                 if (!event->program_result)
 191                         return 0;
 192
 193                 /* get part of the result string */
 194                 i = 0;
 195                 if (attr)
 196                         i = strtoul(attr, &rest, 10);
 197                 if (i > 0) {
 198                         char result[UTIL_PATH_SIZE], tmp[UTIL_PATH_SIZE], *cpos;
 199
 200                         strscpy(result, sizeof(result), event->program_result);
 201                         cpos = result;
 202                         while (--i) {
 203                                 while (cpos[0] != '\0' && !isspace(cpos[0]))
 204                                         cpos++;
 205                                 while (isspace(cpos[0]))
 206                                         cpos++;
 207                                 if (cpos[0] == '\0')
 208                                         break;
 209                         }
 210                         if (i > 0) {
 211                                 log_error("requested part of result string not found");
 212                                 break;
 213                         }
 214                         strscpy(tmp, sizeof(tmp), cpos);
 215                         /* %{2+}c copies the whole string from the second part on */
 216                         if (rest[0] != '+') {
 217                                 cpos = strchr(tmp, ' ');
 218                                 if (cpos)
 219                                         cpos[0] = '\0';
 220                         }
 221                         l = strpcpy(&s, l, tmp);
 222                 } else
 223                         l = strpcpy(&s, l, event->program_result);
 224                 break;
 225         }
 226         case SUBST_ATTR: {
 227                 char vbuf[UTIL_NAME_SIZE];
 228                 size_t len;
 229                 int count;
 230
 231                 if (!attr)
 232                         return -EINVAL;
 233
 234                 /* try to read the value specified by "[dmi/id]product_name" */
 235                 if (util_resolve_subsys_kernel(attr, vbuf, sizeof(vbuf), 1) == 0)
 236                         val = vbuf;
 237
 238                 /* try to read the attribute the device */
 239                 if (!val)
 240                         (void) sd_device_get_sysattr_value(dev, attr, &val);
 241
 242                 /* try to read the attribute of the parent device, other matches have selected */
 243                 if (!val && event->dev_parent && event->dev_parent != dev)
 244                         (void) sd_device_get_sysattr_value(event->dev_parent, attr, &val);
 245
 246                 if (!val)
 247                         return 0;
 248
 249                 /* strip trailing whitespace, and replace unwanted characters */
 250                 if (val != vbuf)
 251                         strscpy(vbuf, sizeof(vbuf), val);
 252                 len = strlen(vbuf);
 253                 while (len > 0 && isspace(vbuf[--len]))
 254                         vbuf[len] = '\0';
 255                 count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 256                 if (count > 0)
 257                         log_device_debug(dev, "%i character(s) replaced", count);
 258                 l = strpcpy(&s, l, vbuf);
 259                 break;
 260         }
 261         case SUBST_PARENT:
 262                 r = sd_device_get_parent(dev, &parent);
 263                 if (r < 0)
 264                         return r == -ENODEV ? 0 : r;
 265                 r = sd_device_get_devname(parent, &val);
 266                 if (r < 0)
 267                         return r == -ENOENT ? 0 : r;
 268                 l = strpcpy(&s, l, val + STRLEN("/dev/"));
 269                 break;
 270         case SUBST_DEVNODE:
 271                 r = sd_device_get_devname(dev, &val);
 272                 if (r < 0)
 273                         return r == -ENOENT ? 0 : r;
 274                 l = strpcpy(&s, l, val);
 275                 break;
 276         case SUBST_NAME:
 277                 if (event->name)
 278                         l = strpcpy(&s, l, event->name);
 279                 else if (sd_device_get_devname(dev, &val) >= 0)
 280                         l = strpcpy(&s, l, val + STRLEN("/dev/"));
 281                 else {
 282                         r = sd_device_get_sysname(dev, &val);
 283                         if (r < 0)
 284                                 return r;
 285                         l = strpcpy(&s, l, val);
 286                 }
 287                 break;
 288         case SUBST_LINKS:
 289                 FOREACH_DEVICE_DEVLINK(dev, val)
 290                         if (s == dest)
 291                                 l = strpcpy(&s, l, val + STRLEN("/dev/"));
 292                         else
 293                                 l = strpcpyl(&s, l, " ", val + STRLEN("/dev/"), NULL);
 294                 break;
 295         case SUBST_ROOT:
 296                 l = strpcpy(&s, l, "/dev");
 297                 break;
 298         case SUBST_SYS:
 299                 l = strpcpy(&s, l, "/sys");
 300                 break;
 301         case SUBST_ENV:
 302                 if (!attr)
 303                         return 0;
 304                 r = sd_device_get_property_value(dev, attr, &val);
 305                 if (r < 0)
 306                         return r == -ENOENT ? 0 : r;
 307                 l = strpcpy(&s, l, val);
 308                 break;
 309         default:
 310                 assert_not_reached("Unknown format substitution type");
 311         }
 312
 313         return s - dest;
 314 }
 315
 316 ssize_t udev_event_apply_format(struct udev_event *event,
 317                                 const char *src, char *dest, size_t size,
 318                                 bool replace_whitespace) {
 319         const char *from;
 320         char *s;
 321         size_t l;
 322
 323         assert(event);
 324         assert(event->dev);
 325         assert(src);
 326         assert(dest);
 327         assert(size > 0);
 328
 329         from = src;
 330         s = dest;
 331         l = size;
 332
 333         for (;;) {
 334                 const struct subst_map_entry *entry = NULL;
 335                 char attrbuf[UTIL_PATH_SIZE], *attr;
 336                 bool format_dollar = false;
 337                 ssize_t subst_len;
 338
 339                 while (from[0] != '\0') {
 340                         if (from[0] == '$') {
 341                                 /* substitute named variable */
 342                                 unsigned i;
 343
 344                                 if (from[1] == '$') {
 345                                         from++;
 346                                         goto copy;
 347                                 }
 348
 349                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 350                                         if (startswith(&from[1], map[i].name)) {
 351                                                 entry = &map[i];
 352                                                 from += strlen(map[i].name)+1;
 353                                                 format_dollar = true;
 354                                                 goto subst;
 355                                         }
 356                                 }
 357                         } else if (from[0] == '%') {
 358                                 /* substitute format char */
 359                                 unsigned i;
 360
 361                                 if (from[1] == '%') {
 362                                         from++;
 363                                         goto copy;
 364                                 }
 365
 366                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 367                                         if (from[1] == map[i].fmt) {
 368                                                 entry = &map[i];
 369                                                 from += 2;
 370                                                 goto subst;
 371                                         }
 372                                 }
 373                         }
 374 copy:
 375                         /* copy char */
 376                         if (l < 2) /* need space for this char and the terminating NUL */
 377                                 goto out;
 378                         s[0] = from[0];
 379                         from++;
 380                         s++;
 381                         l--;
 382                 }
 383
 384                 goto out;
 385 subst:
 386                 /* extract possible $format{attr} */
 387                 if (from[0] == '{') {
 388                         unsigned i;
 389
 390                         from++;
 391                         for (i = 0; from[i] != '}'; i++)
 392                                 if (from[i] == '\0') {
 393                                         log_error("missing closing brace for format '%s'", src);
 394                                         goto out;
 395                                 }
 396
 397                         if (i >= sizeof(attrbuf))
 398                                 goto out;
 399                         memcpy(attrbuf, from, i);
 400                         attrbuf[i] = '\0';
 401                         from += i+1;
 402                         attr = attrbuf;
 403                 } else
 404                         attr = NULL;
 405
 406                 subst_len = subst_format_var(event, entry, attr, s, l);
 407                 if (subst_len < 0) {
 408                         if (format_dollar)
 409                                 log_device_warning_errno(event->dev, subst_len, "Failed to substitute variable '$%s', ignoring: %m", entry->name);
 410                         else
 411                                 log_device_warning_errno(event->dev, subst_len, "Failed to apply format '%%%c', ignoring: %m", entry->fmt);
 412
 413                         continue;
 414                 }
 415
 416                 /* SUBST_RESULT handles spaces itself */
 417                 if (replace_whitespace && entry->type != SUBST_RESULT)
 418                         /* util_replace_whitespace can replace in-place,
 419                          * and does nothing if subst_len == 0
 420                          */
 421                         subst_len = util_replace_whitespace(s, s, subst_len);
 422
 423                 s += subst_len;
 424                 l -= subst_len;
 425         }
 426
 427 out:
 428         assert(l >= 1);
 429         s[0] = '\0';
 430         return l;
 431 }
 432
 433 static int on_spawn_io(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 434         Spawn *spawn = userdata;
 435         char buf[4096], *p;
 436         size_t size;
 437         ssize_t l;
 438
 439         assert(spawn);
 440         assert(fd == spawn->fd_stdout || fd == spawn->fd_stderr);
 441         assert(!spawn->result || spawn->result_len < spawn->result_size);
 442
 443         if (fd == spawn->fd_stdout && spawn->result) {
 444                 p = spawn->result + spawn->result_len;
 445                 size = spawn->result_size - spawn->result_len;
 446         } else {
 447                 p = buf;
 448                 size = sizeof(buf);
 449         }
 450
 451         l = read(fd, p, size - 1);
 452         if (l < 0) {
 453                 if (errno != EAGAIN)
 454                         log_error_errno(errno, "Failed to read stdout of '%s': %m", spawn->cmd);
 455
 456                 return 0;
 457         }
 458
 459         p[l] = '\0';
 460         if (fd == spawn->fd_stdout && spawn->result)
 461                 spawn->result_len += l;
 462
 463         /* Log output only if we watch stderr. */
 464         if (l > 0 && spawn->fd_stderr >= 0) {
 465                 _cleanup_strv_free_ char **v = NULL;
 466                 char **q;
 467
 468                 v = strv_split_newlines(p);
 469                 if (!v)
 470                         return 0;
 471
 472                 STRV_FOREACH(q, v)
 473                         log_debug("'%s'(%s) '%s'", spawn->cmd,
 474                                   fd == spawn->fd_stdout ? "out" : "err", *q);
 475         }
 476
 477         return 0;
 478 }
 479
 480 static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
 481         Spawn *spawn = userdata;
 482         char timeout[FORMAT_TIMESPAN_MAX];
 483
 484         assert(spawn);
 485
 486         kill_and_sigcont(spawn->pid, SIGKILL);
 487
 488         log_error("Spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
 489                   format_timespan(timeout, sizeof(timeout), spawn->timeout_usec, USEC_PER_SEC));
 490
 491         return 1;
 492 }
 493
 494 static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
 495         Spawn *spawn = userdata;
 496         char timeout[FORMAT_TIMESPAN_MAX];
 497
 498         assert(spawn);
 499
 500         log_warning("Spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
 501                     format_timespan(timeout, sizeof(timeout), spawn->timeout_warn_usec, USEC_PER_SEC));
 502
 503         return 1;
 504 }
 505
 506 static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
 507         Spawn *spawn = userdata;
 508
 509         assert(spawn);
 510
 511         switch (si->si_code) {
 512         case CLD_EXITED:
 513                 if (si->si_status == 0) {
 514                         log_debug("Process '%s' succeeded.", spawn->cmd);
 515                         sd_event_exit(sd_event_source_get_event(s), 0);
 516
 517                         return 1;
 518                 }
 519
 520                 log_full(spawn->accept_failure ? LOG_DEBUG : LOG_WARNING,
 521                          "Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
 522                 break;
 523         case CLD_KILLED:
 524         case CLD_DUMPED:
 525                 log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
 526
 527                 break;
 528         default:
 529                 log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
 530         }
 531
 532         sd_event_exit(sd_event_source_get_event(s), -EIO);
 533
 534         return 1;
 535 }
 536
 537 static int spawn_wait(Spawn *spawn) {
 538         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 539         int r, ret;
 540
 541         assert(spawn);
 542
 543         r = sd_event_new(&e);
 544         if (r < 0)
 545                 return r;
 546
 547         if (spawn->timeout_usec > 0) {
 548                 usec_t usec, age_usec;
 549
 550                 usec = now(CLOCK_MONOTONIC);
 551                 age_usec = usec - spawn->event_birth_usec;
 552                 if (age_usec < spawn->timeout_usec) {
 553                         if (spawn->timeout_warn_usec > 0 &&
 554                             spawn->timeout_warn_usec < spawn->timeout_usec &&
 555                             spawn->timeout_warn_usec > age_usec) {
 556                                 spawn->timeout_warn_usec -= age_usec;
 557
 558                                 r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
 559                                                       usec + spawn->timeout_warn_usec, USEC_PER_SEC,
 560                                                       on_spawn_timeout_warning, spawn);
 561                                 if (r < 0)
 562                                         return r;
 563                         }
 564
 565                         spawn->timeout_usec -= age_usec;
 566
 567                         r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
 568                                               usec + spawn->timeout_usec, USEC_PER_SEC, on_spawn_timeout, spawn);
 569                         if (r < 0)
 570                                 return r;
 571                 }
 572         }
 573
 574         r = sd_event_add_io(e, NULL, spawn->fd_stdout, EPOLLIN, on_spawn_io, spawn);
 575         if (r < 0)
 576                 return r;
 577
 578         r = sd_event_add_io(e, NULL, spawn->fd_stderr, EPOLLIN, on_spawn_io, spawn);
 579         if (r < 0)
 580                 return r;
 581
 582         r = sd_event_add_child(e, NULL, spawn->pid, WEXITED, on_spawn_sigchld, spawn);
 583         if (r < 0)
 584                 return r;
 585
 586         r = sd_event_loop(e);
 587         if (r < 0)
 588                 return r;
 589
 590         r = sd_event_get_exit_code(e, &ret);
 591         if (r < 0)
 592                 return r;
 593
 594         return ret;
 595 }
 596
 597 int udev_event_spawn(struct udev_event *event,
 598                      usec_t timeout_usec,
 599                      bool accept_failure,
 600                      const char *cmd,
 601                      char *result, size_t ressize) {
 602         _cleanup_close_pair_ int outpipe[2] = {-1, -1}, errpipe[2] = {-1, -1};
 603         _cleanup_strv_free_ char **argv = NULL;
 604         char **envp = NULL;
 605         Spawn spawn;
 606         pid_t pid;
 607         int r;
 608
 609         assert(event);
 610         assert(event->dev);
 611         assert(result || ressize == 0);
 612
 613         /* pipes from child to parent */
 614         if (result || log_get_max_level() >= LOG_INFO)
 615                 if (pipe2(outpipe, O_NONBLOCK|O_CLOEXEC) != 0)
 616                         return log_error_errno(errno, "Failed to create pipe for command '%s': %m", cmd);
 617
 618         if (log_get_max_level() >= LOG_INFO)
 619                 if (pipe2(errpipe, O_NONBLOCK|O_CLOEXEC) != 0)
 620                         return log_error_errno(errno, "Failed to create pipe for command '%s': %m", cmd);
 621
 622         argv = strv_split_full(cmd, NULL, SPLIT_QUOTES|SPLIT_RELAX);
 623         if (!argv)
 624                 return log_oom();
 625
 626         if (isempty(argv[0])) {
 627                 log_error("Invalid command '%s'", cmd);
 628                 return -EINVAL;
 629         }
 630
 631         /* allow programs in /usr/lib/udev/ to be called without the path */
 632         if (!path_is_absolute(argv[0])) {
 633                 char *program;
 634
 635                 program = path_join(NULL, UDEVLIBEXECDIR, argv[0]);
 636                 if (!program)
 637                         return log_oom();
 638
 639                 free_and_replace(argv[0], program);
 640         }
 641
 642         r = device_get_properties_strv(event->dev, &envp);
 643         if (r < 0)
 644                 return log_device_error_errno(event->dev, r, "Failed to get device properties");
 645
 646         log_debug("Starting '%s'", cmd);
 647
 648         r = safe_fork("(spawn)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
 649         if (r < 0)
 650                 return log_error_errno(r, "Failed to fork() to execute command '%s': %m", cmd);
 651         if (r == 0) {
 652                 if (rearrange_stdio(-1, outpipe[WRITE_END], errpipe[WRITE_END]) < 0)
 653                         _exit(EXIT_FAILURE);
 654
 655                 (void) close_all_fds(NULL, 0);
 656
 657                 execve(argv[0], argv, envp);
 658                 _exit(EXIT_FAILURE);
 659         }
 660
 661         /* parent closed child's ends of pipes */
 662         outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
 663         errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
 664
 665         spawn = (Spawn) {
 666                 .cmd = cmd,
 667                 .pid = pid,
 668                 .accept_failure = accept_failure,
 669                 .timeout_warn_usec = udev_warn_timeout(timeout_usec),
 670                 .timeout_usec = timeout_usec,
 671                 .event_birth_usec = event->birth_usec,
 672                 .fd_stdout = outpipe[READ_END],
 673                 .fd_stderr = errpipe[READ_END],
 674                 .result = result,
 675                 .result_size = ressize,
 676         };
 677         r = spawn_wait(&spawn);
 678         if (r < 0)
 679                 return log_error_errno(r, "Failed to wait spawned command '%s': %m", cmd);
 680
 681         if (result)
 682                 result[spawn.result_len] = '\0';
 683
 684         return r;
 685 }
 686
 687 static int rename_netif(struct udev_event *event) {
 688         sd_device *dev = event->dev;
 689         const char *action, *oldname;
 690         char name[IFNAMSIZ];
 691         int ifindex, r;
 692
 693         if (!event->name)
 694                 return 0; /* No new name is requested. */
 695
 696         r = sd_device_get_sysname(dev, &oldname);
 697         if (r < 0)
 698                 return log_device_error_errno(dev, r, "Failed to get sysname: %m");
 699
 700         if (streq(event->name, oldname))
 701                 return 0; /* The interface name is already requested name. */
 702
 703         r = sd_device_get_property_value(dev, "ACTION", &action);
 704         if (r < 0)
 705                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 706
 707         if (!streq(action, "add"))
 708                 return 0; /* Rename the interface only when it is added. */
 709
 710         r = sd_device_get_ifindex(dev, &ifindex);
 711         if (r == -ENOENT)
 712                 return 0; /* Device is not a network interface. */
 713         if (r < 0)
 714                 return log_device_error_errno(dev, r, "Failed to get ifindex: %m");
 715
 716         strscpy(name, IFNAMSIZ, event->name);
 717         r = rtnl_set_link_name(&event->rtnl, ifindex, name);
 718         if (r < 0)
 719                 return log_device_error_errno(dev, r, "Failed to rename network interface %i from '%s' to '%s': %m", ifindex, oldname, name);
 720
 721         r = device_rename(dev, event->name);
 722         if (r < 0)
 723                 return log_warning_errno(r, "Network interface %i is renamed from '%s' to '%s', but could not update sd_device object: %m", ifindex, oldname, name);
 724
 725         log_device_debug(dev, "Network interface %i is renamed from '%s' to '%s'", ifindex, oldname, name);
 726
 727         return 1;
 728 }
 729
 730 static int update_devnode(struct udev_event *event) {
 731         sd_device *dev = event->dev;
 732         const char *action;
 733         bool apply;
 734         int r;
 735
 736         r = sd_device_get_devnum(dev, NULL);
 737         if (r == -ENOENT)
 738                 return 0;
 739         if (r < 0)
 740                 return log_device_error_errno(dev, r, "Failed to get devnum: %m");
 741
 742         /* remove/update possible left-over symlinks from old database entry */
 743         if (event->dev_db_clone)
 744                 (void) udev_node_update_old_links(dev, event->dev_db_clone);
 745
 746         if (!event->owner_set) {
 747                 r = device_get_devnode_uid(dev, &event->uid);
 748                 if (r < 0 && r != -ENOENT)
 749                         return log_device_error_errno(dev, r, "Failed to get devnode UID: %m");
 750         }
 751
 752         if (!event->group_set) {
 753                 r = device_get_devnode_gid(dev, &event->gid);
 754                 if (r < 0 && r != -ENOENT)
 755                         return log_device_error_errno(dev, r, "Failed to get devnode GID: %m");
 756         }
 757
 758         if (!event->mode_set) {
 759                 r = device_get_devnode_mode(dev, &event->mode);
 760                 if (r < 0 && r != -ENOENT)
 761                         return log_device_error_errno(dev, r, "Failed to get devnode mode: %m");
 762                 if (r == -ENOENT) {
 763                         if (event->gid > 0)
 764                                 /* default 0660 if a group is assigned */
 765                                 event->mode = 0660;
 766                         else
 767                                 /* default 0600 */
 768                                 event->mode = 0600;
 769                 }
 770         }
 771
 772         r = sd_device_get_property_value(dev, "ACTION", &action);
 773         if (r < 0)
 774                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 775
 776         apply = streq(action, "add") || event->owner_set || event->group_set || event->mode_set;
 777         return udev_node_add(dev, apply, event->mode, event->uid, event->gid, event->seclabel_list);
 778 }
 779
 780 static void event_execute_rules_on_remove(
 781                 struct udev_event *event,
 782                 usec_t timeout_usec,
 783                 Hashmap *properties_list,
 784                 struct udev_rules *rules) {
 785
 786         sd_device *dev = event->dev;
 787         int r;
 788
 789         r = device_read_db_force(dev);
 790         if (r < 0)
 791                 log_device_debug_errno(dev, r, "Failed to read database under /run/udev/data/: %m");
 792
 793         r = device_tag_index(dev, NULL, false);
 794         if (r < 0)
 795                 log_device_debug_errno(dev, r, "Failed to remove corresponding tag files under /run/udev/tag/, ignoring: %m");
 796
 797         r = device_delete_db(dev);
 798         if (r < 0)
 799                 log_device_debug_errno(dev, r, "Failed to delete database under /run/udev/data/, ignoring: %m");
 800
 801         if (sd_device_get_devnum(dev, NULL) >= 0)
 802                 (void) udev_watch_end(dev);
 803
 804         (void) udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
 805
 806         if (sd_device_get_devnum(dev, NULL) >= 0)
 807                 (void) udev_node_remove(dev);
 808 }
 809
 810 int udev_event_execute_rules(struct udev_event *event,
 811                              usec_t timeout_usec,
 812                              Hashmap *properties_list,
 813                              struct udev_rules *rules) {
 814         sd_device *dev = event->dev;
 815         const char *subsystem, *action;
 816         int r;
 817
 818         assert(event);
 819         assert(rules);
 820
 821         r = sd_device_get_subsystem(dev, &subsystem);
 822         if (r < 0)
 823                 return log_device_error_errno(dev, r, "Failed to get subsystem: %m");
 824
 825         r = sd_device_get_property_value(dev, "ACTION", &action);
 826         if (r < 0)
 827                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 828
 829         if (streq(action, "remove")) {
 830                 event_execute_rules_on_remove(event, timeout_usec, properties_list, rules);
 831                 return 0;
 832         }
 833
 834         r = device_clone_with_db(dev, &event->dev_db_clone);
 835         if (r < 0)
 836                 log_device_debug_errno(dev, r, "Failed to clone sd_device object, ignoring: %m");
 837
 838         if (event->dev_db_clone) {
 839                 r = sd_device_get_devnum(dev, NULL);
 840                 if (r < 0) {
 841                         if (r != -ENOENT)
 842                                 log_device_debug_errno(dev, r, "Failed to get devnum, ignoring: %m");
 843
 844                         if (streq(action, "move")) {
 845                                 r = device_copy_properties(dev, event->dev_db_clone);
 846                                 if (r < 0)
 847                                         log_device_debug_errno(dev, r, "Failed to copy properties from cloned device, ignoring: %m");
 848                         }
 849                 } else
 850                         /* Disable watch during event processing. */
 851                         (void) udev_watch_end(event->dev_db_clone);
 852         }
 853
 854         (void) udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
 855
 856         (void) rename_netif(event);
 857         (void) update_devnode(event);
 858
 859         /* preserve old, or get new initialization timestamp */
 860         r = device_ensure_usec_initialized(dev, event->dev_db_clone);
 861         if (r < 0)
 862                 log_device_debug_errno(dev, r, "Failed to set initialization timestamp, ignoring: %m");
 863
 864         /* (re)write database file */
 865         r = device_tag_index(dev, event->dev_db_clone, true);
 866         if (r < 0)
 867                 log_device_debug_errno(dev, r, "Failed to update tags under /run/udev/tag/, ignoring: %m");
 868
 869         r = device_update_db(dev);
 870         if (r < 0)
 871                 log_device_debug_errno(dev, r, "Failed to update database under /run/udev/data/, ignoring: %m");
 872
 873         device_set_is_initialized(dev);
 874
 875         event->dev_db_clone = sd_device_unref(event->dev_db_clone);
 876
 877         return 0;
 878 }
 879
 880 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec) {
 881         const char *cmd;
 882         void *val;
 883         Iterator i;
 884
 885         HASHMAP_FOREACH_KEY(val, cmd, event->run_list, i) {
 886                 enum udev_builtin_cmd builtin_cmd = PTR_TO_INT(val);
 887                 char command[UTIL_PATH_SIZE];
 888
 889                 udev_event_apply_format(event, cmd, command, sizeof(command), false);
 890
 891                 if (builtin_cmd >= 0 && builtin_cmd < _UDEV_BUILTIN_MAX)
 892                         udev_builtin_run(event->dev, builtin_cmd, command, false);
 893                 else {
 894                         if (event->exec_delay_usec > 0) {
 895                                 log_debug("delay execution of '%s'", command);
 896                                 (void) usleep(event->exec_delay_usec);
 897                         }
 898
 899                         udev_event_spawn(event, timeout_usec, false, command, NULL, 0);
 900                 }
 901         }
 902 }