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