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-util.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 "strv.h"
  27 #include "strxcpyx.h"
  28 #include "udev-builtin.h"
  29 #include "udev-node.h"
  30 #include "udev-watch.h"
  31 #include "udev.h"
  32
  33 typedef struct Spawn {
  34         const char *cmd;
  35         pid_t pid;
  36         usec_t timeout_warn_usec;
  37         usec_t timeout_usec;
  38         usec_t event_birth_usec;
  39         bool accept_failure;
  40         int fd_stdout;
  41         int fd_stderr;
  42         char *result;
  43         size_t result_size;
  44         size_t result_len;
  45 } Spawn;
  46
  47 struct udev_event *udev_event_new(sd_device *dev, usec_t exec_delay_usec, sd_netlink *rtnl) {
  48         struct udev_event *event;
  49
  50         assert(dev);
  51
  52         event = new(struct udev_event, 1);
  53         if (!event)
  54                 return NULL;
  55
  56         *event = (struct udev_event) {
  57                 .dev = sd_device_ref(dev),
  58                 .birth_usec = now(CLOCK_MONOTONIC),
  59                 .exec_delay_usec = exec_delay_usec,
  60                 .rtnl = sd_netlink_ref(rtnl),
  61         };
  62
  63         return event;
  64 }
  65
  66 struct udev_event *udev_event_free(struct udev_event *event) {
  67         void *p;
  68
  69         if (!event)
  70                 return NULL;
  71
  72         sd_device_unref(event->dev);
  73         sd_device_unref(event->dev_db_clone);
  74         sd_netlink_unref(event->rtnl);
  75         while ((p = hashmap_steal_first_key(event->run_list)))
  76                 free(p);
  77         hashmap_free(event->run_list);
  78         hashmap_free_free_free(event->seclabel_list);
  79         free(event->program_result);
  80         free(event->name);
  81
  82         return mfree(event);
  83 }
  84
  85 enum subst_type {
  86         SUBST_DEVNODE,
  87         SUBST_ATTR,
  88         SUBST_ENV,
  89         SUBST_KERNEL,
  90         SUBST_KERNEL_NUMBER,
  91         SUBST_DRIVER,
  92         SUBST_DEVPATH,
  93         SUBST_ID,
  94         SUBST_MAJOR,
  95         SUBST_MINOR,
  96         SUBST_RESULT,
  97         SUBST_PARENT,
  98         SUBST_NAME,
  99         SUBST_LINKS,
 100         SUBST_ROOT,
 101         SUBST_SYS,
 102 };
 103
 104 struct subst_map_entry {
 105         const char *name;
 106         const char fmt;
 107         enum subst_type type;
 108 };
 109
 110 static const struct subst_map_entry map[] = {
 111            { .name = "devnode",  .fmt = 'N', .type = SUBST_DEVNODE },
 112            { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
 113            { .name = "attr",     .fmt = 's', .type = SUBST_ATTR },
 114            { .name = "sysfs",    .fmt = 's', .type = SUBST_ATTR },
 115            { .name = "env",      .fmt = 'E', .type = SUBST_ENV },
 116            { .name = "kernel",   .fmt = 'k', .type = SUBST_KERNEL },
 117            { .name = "number",   .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
 118            { .name = "driver",   .fmt = 'd', .type = SUBST_DRIVER },
 119            { .name = "devpath",  .fmt = 'p', .type = SUBST_DEVPATH },
 120            { .name = "id",       .fmt = 'b', .type = SUBST_ID },
 121            { .name = "major",    .fmt = 'M', .type = SUBST_MAJOR },
 122            { .name = "minor",    .fmt = 'm', .type = SUBST_MINOR },
 123            { .name = "result",   .fmt = 'c', .type = SUBST_RESULT },
 124            { .name = "parent",   .fmt = 'P', .type = SUBST_PARENT },
 125            { .name = "name",     .fmt = 'D', .type = SUBST_NAME },
 126            { .name = "links",    .fmt = 'L', .type = SUBST_LINKS },
 127            { .name = "root",     .fmt = 'r', .type = SUBST_ROOT },
 128            { .name = "sys",      .fmt = 'S', .type = SUBST_SYS },
 129 };
 130
 131 static ssize_t subst_format_var(struct udev_event *event,
 132                                 const struct subst_map_entry *entry, char *attr,
 133                                 char *dest, size_t l) {
 134         sd_device *parent, *dev = event->dev;
 135         const char *val = NULL;
 136         char *s = dest;
 137         dev_t devnum;
 138         int r;
 139
 140         assert(entry);
 141
 142         switch (entry->type) {
 143         case SUBST_DEVPATH:
 144                 r = sd_device_get_devpath(dev, &val);
 145                 if (r < 0)
 146                         return r;
 147                 l = strpcpy(&s, l, val);
 148                 break;
 149         case SUBST_KERNEL:
 150                 r = sd_device_get_sysname(dev, &val);
 151                 if (r < 0)
 152                         return r;
 153                 l = strpcpy(&s, l, val);
 154                 break;
 155         case SUBST_KERNEL_NUMBER:
 156                 r = sd_device_get_sysnum(dev, &val);
 157                 if (r < 0)
 158                         return r == -ENOENT ? 0 : r;
 159                 l = strpcpy(&s, l, val);
 160                 break;
 161         case SUBST_ID:
 162                 if (!event->dev_parent)
 163                         return 0;
 164                 r = sd_device_get_sysname(event->dev_parent, &val);
 165                 if (r < 0)
 166                         return r;
 167                 l = strpcpy(&s, l, val);
 168                 break;
 169         case SUBST_DRIVER:
 170                 if (!event->dev_parent)
 171                         return 0;
 172                 r = sd_device_get_driver(event->dev_parent, &val);
 173                 if (r < 0)
 174                         return r == -ENOENT ? 0 : r;
 175                 l = strpcpy(&s, l, val);
 176                 break;
 177         case SUBST_MAJOR:
 178         case SUBST_MINOR: {
 179                 char buf[DECIMAL_STR_MAX(unsigned)];
 180
 181                 r = sd_device_get_devnum(dev, &devnum);
 182                 if (r < 0 && r != -ENOENT)
 183                         return r;
 184                 xsprintf(buf, "%u", r < 0 ? 0 : entry->type == SUBST_MAJOR ? major(devnum) : minor(devnum));
 185                 l = strpcpy(&s, l, buf);
 186                 break;
 187         }
 188         case SUBST_RESULT: {
 189                 char *rest;
 190                 int i;
 191
 192                 if (!event->program_result)
 193                         return 0;
 194
 195                 /* get part of the result string */
 196                 i = 0;
 197                 if (attr)
 198                         i = strtoul(attr, &rest, 10);
 199                 if (i > 0) {
 200                         char result[UTIL_PATH_SIZE], tmp[UTIL_PATH_SIZE], *cpos;
 201
 202                         strscpy(result, sizeof(result), event->program_result);
 203                         cpos = result;
 204                         while (--i) {
 205                                 while (cpos[0] != '\0' && !isspace(cpos[0]))
 206                                         cpos++;
 207                                 while (isspace(cpos[0]))
 208                                         cpos++;
 209                                 if (cpos[0] == '\0')
 210                                         break;
 211                         }
 212                         if (i > 0) {
 213                                 log_error("requested part of result string not found");
 214                                 break;
 215                         }
 216                         strscpy(tmp, sizeof(tmp), cpos);
 217                         /* %{2+}c copies the whole string from the second part on */
 218                         if (rest[0] != '+') {
 219                                 cpos = strchr(tmp, ' ');
 220                                 if (cpos)
 221                                         cpos[0] = '\0';
 222                         }
 223                         l = strpcpy(&s, l, tmp);
 224                 } else
 225                         l = strpcpy(&s, l, event->program_result);
 226                 break;
 227         }
 228         case SUBST_ATTR: {
 229                 char vbuf[UTIL_NAME_SIZE];
 230                 size_t len;
 231                 int count;
 232
 233                 if (!attr)
 234                         return -EINVAL;
 235
 236                 /* try to read the value specified by "[dmi/id]product_name" */
 237                 if (util_resolve_subsys_kernel(attr, vbuf, sizeof(vbuf), true) == 0)
 238                         val = vbuf;
 239
 240                 /* try to read the attribute the device */
 241                 if (!val)
 242                         (void) sd_device_get_sysattr_value(dev, attr, &val);
 243
 244                 /* try to read the attribute of the parent device, other matches have selected */
 245                 if (!val && event->dev_parent && event->dev_parent != dev)
 246                         (void) sd_device_get_sysattr_value(event->dev_parent, attr, &val);
 247
 248                 if (!val)
 249                         return 0;
 250
 251                 /* strip trailing whitespace, and replace unwanted characters */
 252                 if (val != vbuf)
 253                         strscpy(vbuf, sizeof(vbuf), val);
 254                 len = strlen(vbuf);
 255                 while (len > 0 && isspace(vbuf[--len]))
 256                         vbuf[len] = '\0';
 257                 count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 258                 if (count > 0)
 259                         log_device_debug(dev, "%i character(s) replaced", count);
 260                 l = strpcpy(&s, l, vbuf);
 261                 break;
 262         }
 263         case SUBST_PARENT:
 264                 r = sd_device_get_parent(dev, &parent);
 265                 if (r < 0)
 266                         return r == -ENODEV ? 0 : r;
 267                 r = sd_device_get_devname(parent, &val);
 268                 if (r < 0)
 269                         return r == -ENOENT ? 0 : r;
 270                 l = strpcpy(&s, l, val + STRLEN("/dev/"));
 271                 break;
 272         case SUBST_DEVNODE:
 273                 r = sd_device_get_devname(dev, &val);
 274                 if (r < 0)
 275                         return r == -ENOENT ? 0 : r;
 276                 l = strpcpy(&s, l, val);
 277                 break;
 278         case SUBST_NAME:
 279                 if (event->name)
 280                         l = strpcpy(&s, l, event->name);
 281                 else if (sd_device_get_devname(dev, &val) >= 0)
 282                         l = strpcpy(&s, l, val + STRLEN("/dev/"));
 283                 else {
 284                         r = sd_device_get_sysname(dev, &val);
 285                         if (r < 0)
 286                                 return r;
 287                         l = strpcpy(&s, l, val);
 288                 }
 289                 break;
 290         case SUBST_LINKS:
 291                 FOREACH_DEVICE_DEVLINK(dev, val)
 292                         if (s == dest)
 293                                 l = strpcpy(&s, l, val + STRLEN("/dev/"));
 294                         else
 295                                 l = strpcpyl(&s, l, " ", val + STRLEN("/dev/"), NULL);
 296                 break;
 297         case SUBST_ROOT:
 298                 l = strpcpy(&s, l, "/dev");
 299                 break;
 300         case SUBST_SYS:
 301                 l = strpcpy(&s, l, "/sys");
 302                 break;
 303         case SUBST_ENV:
 304                 if (!attr)
 305                         return 0;
 306                 r = sd_device_get_property_value(dev, attr, &val);
 307                 if (r < 0)
 308                         return r == -ENOENT ? 0 : r;
 309                 l = strpcpy(&s, l, val);
 310                 break;
 311         default:
 312                 assert_not_reached("Unknown format substitution type");
 313         }
 314
 315         return s - dest;
 316 }
 317
 318 ssize_t udev_event_apply_format(struct udev_event *event,
 319                                 const char *src, char *dest, size_t size,
 320                                 bool replace_whitespace) {
 321         const char *from;
 322         char *s;
 323         size_t l;
 324
 325         assert(event);
 326         assert(event->dev);
 327         assert(src);
 328         assert(dest);
 329         assert(size > 0);
 330
 331         from = src;
 332         s = dest;
 333         l = size;
 334
 335         for (;;) {
 336                 const struct subst_map_entry *entry = NULL;
 337                 char attrbuf[UTIL_PATH_SIZE], *attr;
 338                 bool format_dollar = false;
 339                 ssize_t subst_len;
 340
 341                 while (from[0] != '\0') {
 342                         if (from[0] == '$') {
 343                                 /* substitute named variable */
 344                                 unsigned i;
 345
 346                                 if (from[1] == '$') {
 347                                         from++;
 348                                         goto copy;
 349                                 }
 350
 351                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 352                                         if (startswith(&from[1], map[i].name)) {
 353                                                 entry = &map[i];
 354                                                 from += strlen(map[i].name)+1;
 355                                                 format_dollar = true;
 356                                                 goto subst;
 357                                         }
 358                                 }
 359                         } else if (from[0] == '%') {
 360                                 /* substitute format char */
 361                                 unsigned i;
 362
 363                                 if (from[1] == '%') {
 364                                         from++;
 365                                         goto copy;
 366                                 }
 367
 368                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 369                                         if (from[1] == map[i].fmt) {
 370                                                 entry = &map[i];
 371                                                 from += 2;
 372                                                 goto subst;
 373                                         }
 374                                 }
 375                         }
 376 copy:
 377                         /* copy char */
 378                         if (l < 2) /* need space for this char and the terminating NUL */
 379                                 goto out;
 380                         s[0] = from[0];
 381                         from++;
 382                         s++;
 383                         l--;
 384                 }
 385
 386                 goto out;
 387 subst:
 388                 /* extract possible $format{attr} */
 389                 if (from[0] == '{') {
 390                         unsigned i;
 391
 392                         from++;
 393                         for (i = 0; from[i] != '}'; i++)
 394                                 if (from[i] == '\0') {
 395                                         log_error("missing closing brace for format '%s'", src);
 396                                         goto out;
 397                                 }
 398
 399                         if (i >= sizeof(attrbuf))
 400                                 goto out;
 401                         memcpy(attrbuf, from, i);
 402                         attrbuf[i] = '\0';
 403                         from += i+1;
 404                         attr = attrbuf;
 405                 } else
 406                         attr = NULL;
 407
 408                 subst_len = subst_format_var(event, entry, attr, s, l);
 409                 if (subst_len < 0) {
 410                         if (format_dollar)
 411                                 log_device_warning_errno(event->dev, subst_len, "Failed to substitute variable '$%s', ignoring: %m", entry->name);
 412                         else
 413                                 log_device_warning_errno(event->dev, subst_len, "Failed to apply format '%%%c', ignoring: %m", entry->fmt);
 414
 415                         continue;
 416                 }
 417
 418                 /* SUBST_RESULT handles spaces itself */
 419                 if (replace_whitespace && entry->type != SUBST_RESULT)
 420                         /* util_replace_whitespace can replace in-place,
 421                          * and does nothing if subst_len == 0
 422                          */
 423                         subst_len = util_replace_whitespace(s, s, subst_len);
 424
 425                 s += subst_len;
 426                 l -= subst_len;
 427         }
 428
 429 out:
 430         assert(l >= 1);
 431         s[0] = '\0';
 432         return l;
 433 }
 434
 435 static int on_spawn_io(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 436         Spawn *spawn = userdata;
 437         char buf[4096], *p;
 438         size_t size;
 439         ssize_t l;
 440
 441         assert(spawn);
 442         assert(fd == spawn->fd_stdout || fd == spawn->fd_stderr);
 443         assert(!spawn->result || spawn->result_len < spawn->result_size);
 444
 445         if (fd == spawn->fd_stdout && spawn->result) {
 446                 p = spawn->result + spawn->result_len;
 447                 size = spawn->result_size - spawn->result_len;
 448         } else {
 449                 p = buf;
 450                 size = sizeof(buf);
 451         }
 452
 453         l = read(fd, p, size - 1);
 454         if (l < 0) {
 455                 if (errno != EAGAIN)
 456                         log_error_errno(errno, "Failed to read stdout of '%s': %m", spawn->cmd);
 457
 458                 return 0;
 459         }
 460
 461         p[l] = '\0';
 462         if (fd == spawn->fd_stdout && spawn->result)
 463                 spawn->result_len += l;
 464
 465         /* Log output only if we watch stderr. */
 466         if (l > 0 && spawn->fd_stderr >= 0) {
 467                 _cleanup_strv_free_ char **v = NULL;
 468                 char **q;
 469
 470                 v = strv_split_newlines(p);
 471                 if (!v)
 472                         return 0;
 473
 474                 STRV_FOREACH(q, v)
 475                         log_debug("'%s'(%s) '%s'", spawn->cmd,
 476                                   fd == spawn->fd_stdout ? "out" : "err", *q);
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
 483         Spawn *spawn = userdata;
 484         char timeout[FORMAT_TIMESPAN_MAX];
 485
 486         assert(spawn);
 487
 488         kill_and_sigcont(spawn->pid, SIGKILL);
 489
 490         log_error("Spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
 491                   format_timespan(timeout, sizeof(timeout), spawn->timeout_usec, USEC_PER_SEC));
 492
 493         return 1;
 494 }
 495
 496 static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
 497         Spawn *spawn = userdata;
 498         char timeout[FORMAT_TIMESPAN_MAX];
 499
 500         assert(spawn);
 501
 502         log_warning("Spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
 503                     format_timespan(timeout, sizeof(timeout), spawn->timeout_warn_usec, USEC_PER_SEC));
 504
 505         return 1;
 506 }
 507
 508 static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
 509         Spawn *spawn = userdata;
 510
 511         assert(spawn);
 512
 513         switch (si->si_code) {
 514         case CLD_EXITED:
 515                 if (si->si_status == 0) {
 516                         log_debug("Process '%s' succeeded.", spawn->cmd);
 517                         sd_event_exit(sd_event_source_get_event(s), 0);
 518
 519                         return 1;
 520                 }
 521
 522                 log_full(spawn->accept_failure ? LOG_DEBUG : LOG_WARNING,
 523                          "Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
 524                 break;
 525         case CLD_KILLED:
 526         case CLD_DUMPED:
 527                 log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
 528
 529                 break;
 530         default:
 531                 log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
 532         }
 533
 534         sd_event_exit(sd_event_source_get_event(s), -EIO);
 535
 536         return 1;
 537 }
 538
 539 static int spawn_wait(Spawn *spawn) {
 540         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 541         int r, ret;
 542
 543         assert(spawn);
 544
 545         r = sd_event_new(&e);
 546         if (r < 0)
 547                 return r;
 548
 549         if (spawn->timeout_usec > 0) {
 550                 usec_t usec, age_usec;
 551
 552                 usec = now(CLOCK_MONOTONIC);
 553                 age_usec = usec - spawn->event_birth_usec;
 554                 if (age_usec < spawn->timeout_usec) {
 555                         if (spawn->timeout_warn_usec > 0 &&
 556                             spawn->timeout_warn_usec < spawn->timeout_usec &&
 557                             spawn->timeout_warn_usec > age_usec) {
 558                                 spawn->timeout_warn_usec -= age_usec;
 559
 560                                 r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
 561                                                       usec + spawn->timeout_warn_usec, USEC_PER_SEC,
 562                                                       on_spawn_timeout_warning, spawn);
 563                                 if (r < 0)
 564                                         return r;
 565                         }
 566
 567                         spawn->timeout_usec -= age_usec;
 568
 569                         r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
 570                                               usec + spawn->timeout_usec, USEC_PER_SEC, on_spawn_timeout, spawn);
 571                         if (r < 0)
 572                                 return r;
 573                 }
 574         }
 575
 576         r = sd_event_add_io(e, NULL, spawn->fd_stdout, EPOLLIN, on_spawn_io, spawn);
 577         if (r < 0)
 578                 return r;
 579
 580         r = sd_event_add_io(e, NULL, spawn->fd_stderr, EPOLLIN, on_spawn_io, spawn);
 581         if (r < 0)
 582                 return r;
 583
 584         r = sd_event_add_child(e, NULL, spawn->pid, WEXITED, on_spawn_sigchld, spawn);
 585         if (r < 0)
 586                 return r;
 587
 588         r = sd_event_loop(e);
 589         if (r < 0)
 590                 return r;
 591
 592         r = sd_event_get_exit_code(e, &ret);
 593         if (r < 0)
 594                 return r;
 595
 596         return ret;
 597 }
 598
 599 int udev_event_spawn(struct udev_event *event,
 600                      usec_t timeout_usec,
 601                      bool accept_failure,
 602                      const char *cmd,
 603                      char *result, size_t ressize) {
 604         _cleanup_close_pair_ int outpipe[2] = {-1, -1}, errpipe[2] = {-1, -1};
 605         _cleanup_strv_free_ char **argv = NULL;
 606         char **envp = NULL;
 607         Spawn spawn;
 608         pid_t pid;
 609         int r;
 610
 611         assert(event);
 612         assert(event->dev);
 613         assert(result || ressize == 0);
 614
 615         /* pipes from child to parent */
 616         if (result || log_get_max_level() >= LOG_INFO)
 617                 if (pipe2(outpipe, O_NONBLOCK|O_CLOEXEC) != 0)
 618                         return log_error_errno(errno, "Failed to create pipe for command '%s': %m", cmd);
 619
 620         if (log_get_max_level() >= LOG_INFO)
 621                 if (pipe2(errpipe, O_NONBLOCK|O_CLOEXEC) != 0)
 622                         return log_error_errno(errno, "Failed to create pipe for command '%s': %m", cmd);
 623
 624         argv = strv_split_full(cmd, NULL, SPLIT_QUOTES|SPLIT_RELAX);
 625         if (!argv)
 626                 return log_oom();
 627
 628         if (isempty(argv[0]))
 629                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 630                                        "Invalid command '%s'", cmd);
 631
 632         /* allow programs in /usr/lib/udev/ to be called without the path */
 633         if (!path_is_absolute(argv[0])) {
 634                 char *program;
 635
 636                 program = path_join(UDEVLIBEXECDIR, argv[0]);
 637                 if (!program)
 638                         return log_oom();
 639
 640                 free_and_replace(argv[0], program);
 641         }
 642
 643         r = device_get_properties_strv(event->dev, &envp);
 644         if (r < 0)
 645                 return log_device_error_errno(event->dev, r, "Failed to get device properties");
 646
 647         log_debug("Starting '%s'", cmd);
 648
 649         r = safe_fork("(spawn)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
 650         if (r < 0)
 651                 return log_error_errno(r, "Failed to fork() to execute command '%s': %m", cmd);
 652         if (r == 0) {
 653                 if (rearrange_stdio(-1, outpipe[WRITE_END], errpipe[WRITE_END]) < 0)
 654                         _exit(EXIT_FAILURE);
 655
 656                 (void) close_all_fds(NULL, 0);
 657
 658                 execve(argv[0], argv, envp);
 659                 _exit(EXIT_FAILURE);
 660         }
 661
 662         /* parent closed child's ends of pipes */
 663         outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
 664         errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
 665
 666         spawn = (Spawn) {
 667                 .cmd = cmd,
 668                 .pid = pid,
 669                 .accept_failure = accept_failure,
 670                 .timeout_warn_usec = udev_warn_timeout(timeout_usec),
 671                 .timeout_usec = timeout_usec,
 672                 .event_birth_usec = event->birth_usec,
 673                 .fd_stdout = outpipe[READ_END],
 674                 .fd_stderr = errpipe[READ_END],
 675                 .result = result,
 676                 .result_size = ressize,
 677         };
 678         r = spawn_wait(&spawn);
 679         if (r < 0)
 680                 return log_error_errno(r, "Failed to wait spawned command '%s': %m", cmd);
 681
 682         if (result)
 683                 result[spawn.result_len] = '\0';
 684
 685         return r;
 686 }
 687
 688 static int rename_netif(struct udev_event *event) {
 689         sd_device *dev = event->dev;
 690         const char *action, *oldname;
 691         char name[IFNAMSIZ];
 692         int ifindex, r;
 693
 694         if (!event->name)
 695                 return 0; /* No new name is requested. */
 696
 697         r = sd_device_get_sysname(dev, &oldname);
 698         if (r < 0)
 699                 return log_device_error_errno(dev, r, "Failed to get sysname: %m");
 700
 701         if (streq(event->name, oldname))
 702                 return 0; /* The interface name is already requested name. */
 703
 704         r = sd_device_get_property_value(dev, "ACTION", &action);
 705         if (r < 0)
 706                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 707
 708         if (!streq(action, "add"))
 709                 return 0; /* Rename the interface only when it is added. */
 710
 711         r = sd_device_get_ifindex(dev, &ifindex);
 712         if (r == -ENOENT)
 713                 return 0; /* Device is not a network interface. */
 714         if (r < 0)
 715                 return log_device_error_errno(dev, r, "Failed to get ifindex: %m");
 716
 717         strscpy(name, IFNAMSIZ, event->name);
 718         r = rtnl_set_link_name(&event->rtnl, ifindex, name);
 719         if (r < 0)
 720                 return log_device_error_errno(dev, r, "Failed to rename network interface %i from '%s' to '%s': %m", ifindex, oldname, name);
 721
 722         r = device_rename(dev, event->name);
 723         if (r < 0)
 724                 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);
 725
 726         log_device_debug(dev, "Network interface %i is renamed from '%s' to '%s'", ifindex, oldname, name);
 727
 728         return 1;
 729 }
 730
 731 static int update_devnode(struct udev_event *event) {
 732         sd_device *dev = event->dev;
 733         const char *action;
 734         bool apply;
 735         int r;
 736
 737         r = sd_device_get_devnum(dev, NULL);
 738         if (r == -ENOENT)
 739                 return 0;
 740         if (r < 0)
 741                 return log_device_error_errno(dev, r, "Failed to get devnum: %m");
 742
 743         /* remove/update possible left-over symlinks from old database entry */
 744         if (event->dev_db_clone)
 745                 (void) udev_node_update_old_links(dev, event->dev_db_clone);
 746
 747         if (!event->owner_set) {
 748                 r = device_get_devnode_uid(dev, &event->uid);
 749                 if (r < 0 && r != -ENOENT)
 750                         return log_device_error_errno(dev, r, "Failed to get devnode UID: %m");
 751         }
 752
 753         if (!event->group_set) {
 754                 r = device_get_devnode_gid(dev, &event->gid);
 755                 if (r < 0 && r != -ENOENT)
 756                         return log_device_error_errno(dev, r, "Failed to get devnode GID: %m");
 757         }
 758
 759         if (!event->mode_set) {
 760                 r = device_get_devnode_mode(dev, &event->mode);
 761                 if (r < 0 && r != -ENOENT)
 762                         return log_device_error_errno(dev, r, "Failed to get devnode mode: %m");
 763                 if (r == -ENOENT) {
 764                         if (event->gid > 0)
 765                                 /* default 0660 if a group is assigned */
 766                                 event->mode = 0660;
 767                         else
 768                                 /* default 0600 */
 769                                 event->mode = 0600;
 770                 }
 771         }
 772
 773         r = sd_device_get_property_value(dev, "ACTION", &action);
 774         if (r < 0)
 775                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 776
 777         apply = streq(action, "add") || event->owner_set || event->group_set || event->mode_set;
 778         return udev_node_add(dev, apply, event->mode, event->uid, event->gid, event->seclabel_list);
 779 }
 780
 781 static void event_execute_rules_on_remove(
 782                 struct udev_event *event,
 783                 usec_t timeout_usec,
 784                 Hashmap *properties_list,
 785                 struct udev_rules *rules) {
 786
 787         sd_device *dev = event->dev;
 788         int r;
 789
 790         r = device_read_db_force(dev);
 791         if (r < 0)
 792                 log_device_debug_errno(dev, r, "Failed to read database under /run/udev/data/: %m");
 793
 794         r = device_tag_index(dev, NULL, false);
 795         if (r < 0)
 796                 log_device_debug_errno(dev, r, "Failed to remove corresponding tag files under /run/udev/tag/, ignoring: %m");
 797
 798         r = device_delete_db(dev);
 799         if (r < 0)
 800                 log_device_debug_errno(dev, r, "Failed to delete database under /run/udev/data/, ignoring: %m");
 801
 802         if (sd_device_get_devnum(dev, NULL) >= 0)
 803                 (void) udev_watch_end(dev);
 804
 805         (void) udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
 806
 807         if (sd_device_get_devnum(dev, NULL) >= 0)
 808                 (void) udev_node_remove(dev);
 809 }
 810
 811 int udev_event_execute_rules(struct udev_event *event,
 812                              usec_t timeout_usec,
 813                              Hashmap *properties_list,
 814                              struct udev_rules *rules) {
 815         sd_device *dev = event->dev;
 816         const char *subsystem, *action;
 817         int r;
 818
 819         assert(event);
 820         assert(rules);
 821
 822         r = sd_device_get_subsystem(dev, &subsystem);
 823         if (r < 0)
 824                 return log_device_error_errno(dev, r, "Failed to get subsystem: %m");
 825
 826         r = sd_device_get_property_value(dev, "ACTION", &action);
 827         if (r < 0)
 828                 return log_device_error_errno(dev, r, "Failed to get property 'ACTION': %m");
 829
 830         if (streq(action, "remove")) {
 831                 event_execute_rules_on_remove(event, timeout_usec, properties_list, rules);
 832                 return 0;
 833         }
 834
 835         r = device_clone_with_db(dev, &event->dev_db_clone);
 836         if (r < 0)
 837                 log_device_debug_errno(dev, r, "Failed to clone sd_device object, ignoring: %m");
 838
 839         if (event->dev_db_clone) {
 840                 r = sd_device_get_devnum(dev, NULL);
 841                 if (r < 0) {
 842                         if (r != -ENOENT)
 843                                 log_device_debug_errno(dev, r, "Failed to get devnum, ignoring: %m");
 844
 845                         if (streq(action, "move")) {
 846                                 r = device_copy_properties(dev, event->dev_db_clone);
 847                                 if (r < 0)
 848                                         log_device_debug_errno(dev, r, "Failed to copy properties from cloned device, ignoring: %m");
 849                         }
 850                 } else
 851                         /* Disable watch during event processing. */
 852                         (void) udev_watch_end(event->dev_db_clone);
 853         }
 854
 855         (void) udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
 856
 857         (void) rename_netif(event);
 858         (void) update_devnode(event);
 859
 860         /* preserve old, or get new initialization timestamp */
 861         r = device_ensure_usec_initialized(dev, event->dev_db_clone);
 862         if (r < 0)
 863                 log_device_debug_errno(dev, r, "Failed to set initialization timestamp, ignoring: %m");
 864
 865         /* (re)write database file */
 866         r = device_tag_index(dev, event->dev_db_clone, true);
 867         if (r < 0)
 868                 log_device_debug_errno(dev, r, "Failed to update tags under /run/udev/tag/, ignoring: %m");
 869
 870         r = device_update_db(dev);
 871         if (r < 0)
 872                 log_device_debug_errno(dev, r, "Failed to update database under /run/udev/data/, ignoring: %m");
 873
 874         device_set_is_initialized(dev);
 875
 876         event->dev_db_clone = sd_device_unref(event->dev_db_clone);
 877
 878         return 0;
 879 }
 880
 881 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec) {
 882         const char *cmd;
 883         void *val;
 884         Iterator i;
 885
 886         HASHMAP_FOREACH_KEY(val, cmd, event->run_list, i) {
 887                 enum udev_builtin_cmd builtin_cmd = PTR_TO_INT(val);
 888                 char command[UTIL_PATH_SIZE];
 889
 890                 udev_event_apply_format(event, cmd, command, sizeof(command), false);
 891
 892                 if (builtin_cmd >= 0 && builtin_cmd < _UDEV_BUILTIN_MAX)
 893                         udev_builtin_run(event->dev, builtin_cmd, command, false);
 894                 else {
 895                         if (event->exec_delay_usec > 0) {
 896                                 log_debug("delay execution of '%s'", command);
 897                                 (void) usleep(event->exec_delay_usec);
 898                         }
 899
 900                         udev_event_spawn(event, timeout_usec, false, command, NULL, 0);
 901                 }
 902         }
 903 }