src/udev/udev-event.c

   1 /*
   2  * Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <stdio.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <string.h>
  26 #include <net/if.h>
  27 #include <sys/prctl.h>
  28 #include <poll.h>
  29 #include <sys/epoll.h>
  30 #include <sys/wait.h>
  31 #include <sys/signalfd.h>
  32
  33 #include "udev.h"
  34 #include "rtnl-util.h"
  35 #include "event-util.h"
  36 #include "formats-util.h"
  37 #include "process-util.h"
  38
  39 typedef struct Spawn {
  40         const char *cmd;
  41         pid_t pid;
  42         usec_t timeout_warn;
  43         usec_t timeout;
  44 } Spawn;
  45
  46 struct udev_event *udev_event_new(struct udev_device *dev) {
  47         struct udev *udev = udev_device_get_udev(dev);
  48         struct udev_event *event;
  49
  50         event = new0(struct udev_event, 1);
  51         if (event == NULL)
  52                 return NULL;
  53         event->dev = dev;
  54         event->udev = udev;
  55         udev_list_init(udev, &event->run_list, false);
  56         udev_list_init(udev, &event->seclabel_list, false);
  57         event->birth_usec = clock_boottime_or_monotonic();
  58         return event;
  59 }
  60
  61 void udev_event_unref(struct udev_event *event) {
  62         if (event == NULL)
  63                 return;
  64         sd_rtnl_unref(event->rtnl);
  65         udev_list_cleanup(&event->run_list);
  66         udev_list_cleanup(&event->seclabel_list);
  67         free(event->program_result);
  68         free(event->name);
  69         free(event);
  70 }
  71
  72 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) {
  73         struct udev_device *dev = event->dev;
  74         enum subst_type {
  75                 SUBST_UNKNOWN,
  76                 SUBST_DEVNODE,
  77                 SUBST_ATTR,
  78                 SUBST_ENV,
  79                 SUBST_KERNEL,
  80                 SUBST_KERNEL_NUMBER,
  81                 SUBST_DRIVER,
  82                 SUBST_DEVPATH,
  83                 SUBST_ID,
  84                 SUBST_MAJOR,
  85                 SUBST_MINOR,
  86                 SUBST_RESULT,
  87                 SUBST_PARENT,
  88                 SUBST_NAME,
  89                 SUBST_LINKS,
  90                 SUBST_ROOT,
  91                 SUBST_SYS,
  92         };
  93         static const struct subst_map {
  94                 const char *name;
  95                 const char fmt;
  96                 enum subst_type type;
  97         } map[] = {
  98                 { .name = "devnode",  .fmt = 'N', .type = SUBST_DEVNODE },
  99                 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
 100                 { .name = "attr",     .fmt = 's', .type = SUBST_ATTR },
 101                 { .name = "sysfs",    .fmt = 's', .type = SUBST_ATTR },
 102                 { .name = "env",      .fmt = 'E', .type = SUBST_ENV },
 103                 { .name = "kernel",   .fmt = 'k', .type = SUBST_KERNEL },
 104                 { .name = "number",   .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
 105                 { .name = "driver",   .fmt = 'd', .type = SUBST_DRIVER },
 106                 { .name = "devpath",  .fmt = 'p', .type = SUBST_DEVPATH },
 107                 { .name = "id",       .fmt = 'b', .type = SUBST_ID },
 108                 { .name = "major",    .fmt = 'M', .type = SUBST_MAJOR },
 109                 { .name = "minor",    .fmt = 'm', .type = SUBST_MINOR },
 110                 { .name = "result",   .fmt = 'c', .type = SUBST_RESULT },
 111                 { .name = "parent",   .fmt = 'P', .type = SUBST_PARENT },
 112                 { .name = "name",     .fmt = 'D', .type = SUBST_NAME },
 113                 { .name = "links",    .fmt = 'L', .type = SUBST_LINKS },
 114                 { .name = "root",     .fmt = 'r', .type = SUBST_ROOT },
 115                 { .name = "sys",      .fmt = 'S', .type = SUBST_SYS },
 116         };
 117         const char *from;
 118         char *s;
 119         size_t l;
 120
 121         from = src;
 122         s = dest;
 123         l = size;
 124
 125         for (;;) {
 126                 enum subst_type type = SUBST_UNKNOWN;
 127                 char attrbuf[UTIL_PATH_SIZE];
 128                 char *attr = NULL;
 129
 130                 while (from[0] != '\0') {
 131                         if (from[0] == '$') {
 132                                 /* substitute named variable */
 133                                 unsigned int i;
 134
 135                                 if (from[1] == '$') {
 136                                         from++;
 137                                         goto copy;
 138                                 }
 139
 140                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 141                                         if (startswith(&from[1], map[i].name)) {
 142                                                 type = map[i].type;
 143                                                 from += strlen(map[i].name)+1;
 144                                                 goto subst;
 145                                         }
 146                                 }
 147                         } else if (from[0] == '%') {
 148                                 /* substitute format char */
 149                                 unsigned int i;
 150
 151                                 if (from[1] == '%') {
 152                                         from++;
 153                                         goto copy;
 154                                 }
 155
 156                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 157                                         if (from[1] == map[i].fmt) {
 158                                                 type = map[i].type;
 159                                                 from += 2;
 160                                                 goto subst;
 161                                         }
 162                                 }
 163                         }
 164 copy:
 165                         /* copy char */
 166                         if (l == 0)
 167                                 goto out;
 168                         s[0] = from[0];
 169                         from++;
 170                         s++;
 171                         l--;
 172                 }
 173
 174                 goto out;
 175 subst:
 176                 /* extract possible $format{attr} */
 177                 if (from[0] == '{') {
 178                         unsigned int i;
 179
 180                         from++;
 181                         for (i = 0; from[i] != '}'; i++) {
 182                                 if (from[i] == '\0') {
 183                                         log_error("missing closing brace for format '%s'", src);
 184                                         goto out;
 185                                 }
 186                         }
 187                         if (i >= sizeof(attrbuf))
 188                                 goto out;
 189                         memcpy(attrbuf, from, i);
 190                         attrbuf[i] = '\0';
 191                         from += i+1;
 192                         attr = attrbuf;
 193                 } else {
 194                         attr = NULL;
 195                 }
 196
 197                 switch (type) {
 198                 case SUBST_DEVPATH:
 199                         l = strpcpy(&s, l, udev_device_get_devpath(dev));
 200                         break;
 201                 case SUBST_KERNEL:
 202                         l = strpcpy(&s, l, udev_device_get_sysname(dev));
 203                         break;
 204                 case SUBST_KERNEL_NUMBER:
 205                         if (udev_device_get_sysnum(dev) == NULL)
 206                                 break;
 207                         l = strpcpy(&s, l, udev_device_get_sysnum(dev));
 208                         break;
 209                 case SUBST_ID:
 210                         if (event->dev_parent == NULL)
 211                                 break;
 212                         l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
 213                         break;
 214                 case SUBST_DRIVER: {
 215                         const char *driver;
 216
 217                         if (event->dev_parent == NULL)
 218                                 break;
 219
 220                         driver = udev_device_get_driver(event->dev_parent);
 221                         if (driver == NULL)
 222                                 break;
 223                         l = strpcpy(&s, l, driver);
 224                         break;
 225                 }
 226                 case SUBST_MAJOR: {
 227                         char num[UTIL_PATH_SIZE];
 228
 229                         sprintf(num, "%u", major(udev_device_get_devnum(dev)));
 230                         l = strpcpy(&s, l, num);
 231                         break;
 232                 }
 233                 case SUBST_MINOR: {
 234                         char num[UTIL_PATH_SIZE];
 235
 236                         sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
 237                         l = strpcpy(&s, l, num);
 238                         break;
 239                 }
 240                 case SUBST_RESULT: {
 241                         char *rest;
 242                         int i;
 243
 244                         if (event->program_result == NULL)
 245                                 break;
 246                         /* get part part of the result string */
 247                         i = 0;
 248                         if (attr != NULL)
 249                                 i = strtoul(attr, &rest, 10);
 250                         if (i > 0) {
 251                                 char result[UTIL_PATH_SIZE];
 252                                 char tmp[UTIL_PATH_SIZE];
 253                                 char *cpos;
 254
 255                                 strscpy(result, sizeof(result), event->program_result);
 256                                 cpos = result;
 257                                 while (--i) {
 258                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 259                                                 cpos++;
 260                                         while (isspace(cpos[0]))
 261                                                 cpos++;
 262                                         if (cpos[0] == '\0')
 263                                                 break;
 264                                 }
 265                                 if (i > 0) {
 266                                         log_error("requested part of result string not found");
 267                                         break;
 268                                 }
 269                                 strscpy(tmp, sizeof(tmp), cpos);
 270                                 /* %{2+}c copies the whole string from the second part on */
 271                                 if (rest[0] != '+') {
 272                                         cpos = strchr(tmp, ' ');
 273                                         if (cpos)
 274                                                 cpos[0] = '\0';
 275                                 }
 276                                 l = strpcpy(&s, l, tmp);
 277                         } else {
 278                                 l = strpcpy(&s, l, event->program_result);
 279                         }
 280                         break;
 281                 }
 282                 case SUBST_ATTR: {
 283                         const char *value = NULL;
 284                         char vbuf[UTIL_NAME_SIZE];
 285                         size_t len;
 286                         int count;
 287
 288                         if (attr == NULL) {
 289                                 log_error("missing file parameter for attr");
 290                                 break;
 291                         }
 292
 293                         /* try to read the value specified by "[dmi/id]product_name" */
 294                         if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
 295                                 value = vbuf;
 296
 297                         /* try to read the attribute the device */
 298                         if (value == NULL)
 299                                 value = udev_device_get_sysattr_value(event->dev, attr);
 300
 301                         /* try to read the attribute of the parent device, other matches have selected */
 302                         if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
 303                                 value = udev_device_get_sysattr_value(event->dev_parent, attr);
 304
 305                         if (value == NULL)
 306                                 break;
 307
 308                         /* strip trailing whitespace, and replace unwanted characters */
 309                         if (value != vbuf)
 310                                 strscpy(vbuf, sizeof(vbuf), value);
 311                         len = strlen(vbuf);
 312                         while (len > 0 && isspace(vbuf[--len]))
 313                                 vbuf[len] = '\0';
 314                         count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 315                         if (count > 0)
 316                                 log_debug("%i character(s) replaced" , count);
 317                         l = strpcpy(&s, l, vbuf);
 318                         break;
 319                 }
 320                 case SUBST_PARENT: {
 321                         struct udev_device *dev_parent;
 322                         const char *devnode;
 323
 324                         dev_parent = udev_device_get_parent(event->dev);
 325                         if (dev_parent == NULL)
 326                                 break;
 327                         devnode = udev_device_get_devnode(dev_parent);
 328                         if (devnode != NULL)
 329                                 l = strpcpy(&s, l, devnode + strlen("/dev/"));
 330                         break;
 331                 }
 332                 case SUBST_DEVNODE:
 333                         if (udev_device_get_devnode(dev) != NULL)
 334                                 l = strpcpy(&s, l, udev_device_get_devnode(dev));
 335                         break;
 336                 case SUBST_NAME:
 337                         if (event->name != NULL)
 338                                 l = strpcpy(&s, l, event->name);
 339                         else if (udev_device_get_devnode(dev) != NULL)
 340                                 l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/"));
 341                         else
 342                                 l = strpcpy(&s, l, udev_device_get_sysname(dev));
 343                         break;
 344                 case SUBST_LINKS: {
 345                         struct udev_list_entry *list_entry;
 346
 347                         list_entry = udev_device_get_devlinks_list_entry(dev);
 348                         if (list_entry == NULL)
 349                                 break;
 350                         l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/"));
 351                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 352                                 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL);
 353                         break;
 354                 }
 355                 case SUBST_ROOT:
 356                         l = strpcpy(&s, l, "/dev");
 357                         break;
 358                 case SUBST_SYS:
 359                         l = strpcpy(&s, l, "/sys");
 360                         break;
 361                 case SUBST_ENV:
 362                         if (attr == NULL) {
 363                                 break;
 364                         } else {
 365                                 const char *value;
 366
 367                                 value = udev_device_get_property_value(event->dev, attr);
 368                                 if (value == NULL)
 369                                         break;
 370                                 l = strpcpy(&s, l, value);
 371                                 break;
 372                         }
 373                 default:
 374                         log_error("unknown substitution type=%i", type);
 375                         break;
 376                 }
 377         }
 378
 379 out:
 380         s[0] = '\0';
 381         return l;
 382 }
 383
 384 static int spawn_exec(struct udev_event *event,
 385                       const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
 386                       int fd_stdout, int fd_stderr) {
 387         _cleanup_close_ int fd = -1;
 388
 389         /* discard child output or connect to pipe */
 390         fd = open("/dev/null", O_RDWR);
 391         if (fd >= 0) {
 392                 dup2(fd, STDIN_FILENO);
 393                 if (fd_stdout < 0)
 394                         dup2(fd, STDOUT_FILENO);
 395                 if (fd_stderr < 0)
 396                         dup2(fd, STDERR_FILENO);
 397         } else
 398                 log_error_errno(errno, "open /dev/null failed: %m");
 399
 400         /* connect pipes to std{out,err} */
 401         if (fd_stdout >= 0) {
 402                 dup2(fd_stdout, STDOUT_FILENO);
 403                 safe_close(fd_stdout);
 404         }
 405         if (fd_stderr >= 0) {
 406                 dup2(fd_stderr, STDERR_FILENO);
 407                 safe_close(fd_stderr);
 408         }
 409
 410         /* terminate child in case parent goes away */
 411         prctl(PR_SET_PDEATHSIG, SIGTERM);
 412
 413         /* restore original udev sigmask before exec */
 414         if (sigmask)
 415                 sigprocmask(SIG_SETMASK, sigmask, NULL);
 416
 417         execve(argv[0], argv, envp);
 418
 419         /* exec failed */
 420         log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
 421
 422         return -errno;
 423 }
 424
 425 static void spawn_read(struct udev_event *event,
 426                        usec_t timeout_usec,
 427                        const char *cmd,
 428                        int fd_stdout, int fd_stderr,
 429                        char *result, size_t ressize) {
 430         _cleanup_close_ int fd_ep = -1;
 431         struct epoll_event ep_outpipe = {
 432                 .events = EPOLLIN,
 433                 .data.ptr = &fd_stdout,
 434         };
 435         struct epoll_event ep_errpipe = {
 436                 .events = EPOLLIN,
 437                 .data.ptr = &fd_stderr,
 438         };
 439         size_t respos = 0;
 440         int r;
 441
 442         /* read from child if requested */
 443         if (fd_stdout < 0 && fd_stderr < 0)
 444                 return;
 445
 446         fd_ep = epoll_create1(EPOLL_CLOEXEC);
 447         if (fd_ep < 0) {
 448                 log_error_errno(errno, "error creating epoll fd: %m");
 449                 return;
 450         }
 451
 452         if (fd_stdout >= 0) {
 453                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
 454                 if (r < 0) {
 455                         log_error_errno(errno, "fail to add stdout fd to epoll: %m");
 456                         return;
 457                 }
 458         }
 459
 460         if (fd_stderr >= 0) {
 461                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
 462                 if (r < 0) {
 463                         log_error_errno(errno, "fail to add stderr fd to epoll: %m");
 464                         return;
 465                 }
 466         }
 467
 468         /* read child output */
 469         while (fd_stdout >= 0 || fd_stderr >= 0) {
 470                 int timeout;
 471                 int fdcount;
 472                 struct epoll_event ev[4];
 473                 int i;
 474
 475                 if (timeout_usec > 0) {
 476                         usec_t age_usec;
 477
 478                         age_usec = clock_boottime_or_monotonic() - event->birth_usec;
 479                         if (age_usec >= timeout_usec) {
 480                                 log_error("timeout '%s'", cmd);
 481                                 return;
 482                         }
 483                         timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
 484                 } else {
 485                         timeout = -1;
 486                 }
 487
 488                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
 489                 if (fdcount < 0) {
 490                         if (errno == EINTR)
 491                                 continue;
 492                         log_error_errno(errno, "failed to poll: %m");
 493                         return;
 494                 } else if (fdcount == 0) {
 495                         log_error("timeout '%s'", cmd);
 496                         return;
 497                 }
 498
 499                 for (i = 0; i < fdcount; i++) {
 500                         int *fd = (int *)ev[i].data.ptr;
 501
 502                         if (*fd < 0)
 503                                 continue;
 504
 505                         if (ev[i].events & EPOLLIN) {
 506                                 ssize_t count;
 507                                 char buf[4096];
 508
 509                                 count = read(*fd, buf, sizeof(buf)-1);
 510                                 if (count <= 0)
 511                                         continue;
 512                                 buf[count] = '\0';
 513
 514                                 /* store stdout result */
 515                                 if (result != NULL && *fd == fd_stdout) {
 516                                         if (respos + count < ressize) {
 517                                                 memcpy(&result[respos], buf, count);
 518                                                 respos += count;
 519                                         } else {
 520                                                 log_error("'%s' ressize %zu too short", cmd, ressize);
 521                                         }
 522                                 }
 523
 524                                 /* log debug output only if we watch stderr */
 525                                 if (fd_stderr >= 0) {
 526                                         char *pos;
 527                                         char *line;
 528
 529                                         pos = buf;
 530                                         while ((line = strsep(&pos, "\n"))) {
 531                                                 if (pos != NULL || line[0] != '\0')
 532                                                         log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
 533                                         }
 534                                 }
 535                         } else if (ev[i].events & EPOLLHUP) {
 536                                 r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
 537                                 if (r < 0) {
 538                                         log_error_errno(errno, "failed to remove fd from epoll: %m");
 539                                         return;
 540                                 }
 541                                 *fd = -1;
 542                         }
 543                 }
 544         }
 545
 546         /* return the child's stdout string */
 547         if (result != NULL)
 548                 result[respos] = '\0';
 549 }
 550
 551 static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
 552         Spawn *spawn = userdata;
 553         char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
 554
 555         assert(spawn);
 556
 557         kill_and_sigcont(spawn->pid, SIGKILL);
 558
 559         log_error("spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
 560                   format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
 561
 562         return 1;
 563 }
 564
 565 static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
 566         Spawn *spawn = userdata;
 567         char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
 568
 569         assert(spawn);
 570
 571         log_warning("spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
 572                     format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
 573
 574         return 1;
 575 }
 576
 577 static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
 578         Spawn *spawn = userdata;
 579
 580         assert(spawn);
 581
 582         switch (si->si_code) {
 583         case CLD_EXITED:
 584                 if (si->si_status != 0)
 585                         log_warning("process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
 586                 else {
 587                         log_debug("process '%s' succeeded.", spawn->cmd);
 588                         sd_event_exit(sd_event_source_get_event(s), 0);
 589
 590                         return 1;
 591                 }
 592
 593                 break;
 594         case CLD_KILLED:
 595         case CLD_DUMPED:
 596                 log_warning("process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
 597
 598                 break;
 599         default:
 600                 log_error("process '%s' failed due to unknown reason.", spawn->cmd);
 601         }
 602
 603         sd_event_exit(sd_event_source_get_event(s), -EIO);
 604
 605         return 1;
 606 }
 607
 608 static int spawn_wait(struct udev_event *event,
 609                       usec_t timeout_usec,
 610                       usec_t timeout_warn_usec,
 611                       const char *cmd, pid_t pid) {
 612         Spawn spawn = {
 613                 .cmd = cmd,
 614                 .pid = pid,
 615         };
 616         _cleanup_event_unref_ sd_event *e = NULL;
 617         int r, ret;
 618
 619         r = sd_event_new(&e);
 620         if (r < 0)
 621                 return r;
 622
 623         if (timeout_usec > 0) {
 624                 usec_t usec, age_usec;
 625
 626                 usec = now(clock_boottime_or_monotonic());
 627                 age_usec = usec - event->birth_usec;
 628                 if (age_usec < timeout_usec) {
 629                         if (timeout_warn_usec > 0 && timeout_warn_usec < timeout_usec && age_usec < timeout_warn_usec) {
 630                                 spawn.timeout_warn = timeout_warn_usec - age_usec;
 631
 632                                 r =  sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
 633                                                        usec + spawn.timeout_warn, USEC_PER_SEC,
 634                                                        on_spawn_timeout_warning, &spawn);
 635                                 if (r < 0)
 636                                         return r;
 637                         }
 638
 639                         spawn.timeout = timeout_usec - age_usec;
 640
 641                         r = sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
 642                                               usec + spawn.timeout, USEC_PER_SEC, on_spawn_timeout, &spawn);
 643                         if (r < 0)
 644                                 return r;
 645                 }
 646         }
 647
 648         r = sd_event_add_child(e, NULL, pid, WEXITED, on_spawn_sigchld, &spawn);
 649         if (r < 0)
 650                 return r;
 651
 652         r = sd_event_loop(e);
 653         if (r < 0)
 654                 return r;
 655
 656         r = sd_event_get_exit_code(e, &ret);
 657         if (r < 0)
 658                 return r;
 659
 660         return ret;
 661 }
 662
 663 int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
 664         int i = 0;
 665         char *pos;
 666
 667         if (strchr(cmd, ' ') == NULL) {
 668                 argv[i++] = cmd;
 669                 goto out;
 670         }
 671
 672         pos = cmd;
 673         while (pos != NULL && pos[0] != '\0') {
 674                 if (pos[0] == '\'') {
 675                         /* do not separate quotes */
 676                         pos++;
 677                         argv[i] = strsep(&pos, "\'");
 678                         if (pos != NULL)
 679                                 while (pos[0] == ' ')
 680                                         pos++;
 681                 } else {
 682                         argv[i] = strsep(&pos, " ");
 683                         if (pos != NULL)
 684                                 while (pos[0] == ' ')
 685                                         pos++;
 686                 }
 687                 i++;
 688         }
 689 out:
 690         argv[i] = NULL;
 691         if (argc)
 692                 *argc = i;
 693         return 0;
 694 }
 695
 696 int udev_event_spawn(struct udev_event *event,
 697                      usec_t timeout_usec,
 698                      usec_t timeout_warn_usec,
 699                      const char *cmd, char **envp, const sigset_t *sigmask,
 700                      char *result, size_t ressize) {
 701         int outpipe[2] = {-1, -1};
 702         int errpipe[2] = {-1, -1};
 703         pid_t pid;
 704         char arg[UTIL_PATH_SIZE];
 705         char *argv[128];
 706         char program[UTIL_PATH_SIZE];
 707         int err = 0;
 708
 709         strscpy(arg, sizeof(arg), cmd);
 710         udev_build_argv(event->udev, arg, NULL, argv);
 711
 712         /* pipes from child to parent */
 713         if (result != NULL || log_get_max_level() >= LOG_INFO) {
 714                 if (pipe2(outpipe, O_NONBLOCK) != 0) {
 715                         err = -errno;
 716                         log_error_errno(errno, "pipe failed: %m");
 717                         goto out;
 718                 }
 719         }
 720         if (log_get_max_level() >= LOG_INFO) {
 721                 if (pipe2(errpipe, O_NONBLOCK) != 0) {
 722                         err = -errno;
 723                         log_error_errno(errno, "pipe failed: %m");
 724                         goto out;
 725                 }
 726         }
 727
 728         /* allow programs in /usr/lib/udev/ to be called without the path */
 729         if (argv[0][0] != '/') {
 730                 strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
 731                 argv[0] = program;
 732         }
 733
 734         pid = fork();
 735         switch(pid) {
 736         case 0:
 737                 /* child closes parent's ends of pipes */
 738                 if (outpipe[READ_END] >= 0) {
 739                         close(outpipe[READ_END]);
 740                         outpipe[READ_END] = -1;
 741                 }
 742                 if (errpipe[READ_END] >= 0) {
 743                         close(errpipe[READ_END]);
 744                         errpipe[READ_END] = -1;
 745                 }
 746
 747                 log_debug("starting '%s'", cmd);
 748
 749                 spawn_exec(event, cmd, argv, envp, sigmask,
 750                            outpipe[WRITE_END], errpipe[WRITE_END]);
 751
 752                 _exit(2 );
 753         case -1:
 754                 log_error_errno(errno, "fork of '%s' failed: %m", cmd);
 755                 err = -1;
 756                 goto out;
 757         default:
 758                 /* parent closed child's ends of pipes */
 759                 if (outpipe[WRITE_END] >= 0) {
 760                         close(outpipe[WRITE_END]);
 761                         outpipe[WRITE_END] = -1;
 762                 }
 763                 if (errpipe[WRITE_END] >= 0) {
 764                         close(errpipe[WRITE_END]);
 765                         errpipe[WRITE_END] = -1;
 766                 }
 767
 768                 spawn_read(event,
 769                            timeout_usec,
 770                            cmd,
 771                            outpipe[READ_END], errpipe[READ_END],
 772                            result, ressize);
 773
 774                 err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
 775         }
 776
 777 out:
 778         if (outpipe[READ_END] >= 0)
 779                 close(outpipe[READ_END]);
 780         if (outpipe[WRITE_END] >= 0)
 781                 close(outpipe[WRITE_END]);
 782         if (errpipe[READ_END] >= 0)
 783                 close(errpipe[READ_END]);
 784         if (errpipe[WRITE_END] >= 0)
 785                 close(errpipe[WRITE_END]);
 786         return err;
 787 }
 788
 789 static int rename_netif(struct udev_event *event) {
 790         struct udev_device *dev = event->dev;
 791         char name[IFNAMSIZ];
 792         const char *oldname;
 793         int r;
 794
 795         oldname = udev_device_get_sysname(dev);
 796
 797         strscpy(name, IFNAMSIZ, event->name);
 798
 799         r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
 800         if (r < 0)
 801                 return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
 802
 803         log_debug("renamed network interface '%s' to '%s'", oldname, name);
 804
 805         return 0;
 806 }
 807
 808 void udev_event_execute_rules(struct udev_event *event,
 809                               usec_t timeout_usec, usec_t timeout_warn_usec,
 810                               struct udev_list *properties_list,
 811                               struct udev_rules *rules,
 812                               const sigset_t *sigmask) {
 813         struct udev_device *dev = event->dev;
 814
 815         if (udev_device_get_subsystem(dev) == NULL)
 816                 return;
 817
 818         if (streq(udev_device_get_action(dev), "remove")) {
 819                 udev_device_read_db(dev);
 820                 udev_device_tag_index(dev, NULL, false);
 821                 udev_device_delete_db(dev);
 822
 823                 if (major(udev_device_get_devnum(dev)) != 0)
 824                         udev_watch_end(event->udev, dev);
 825
 826                 udev_rules_apply_to_event(rules, event,
 827                                           timeout_usec, timeout_warn_usec,
 828                                           properties_list,
 829                                           sigmask);
 830
 831                 if (major(udev_device_get_devnum(dev)) != 0)
 832                         udev_node_remove(dev);
 833         } else {
 834                 event->dev_db = udev_device_clone_with_db(dev);
 835                 if (event->dev_db != NULL) {
 836                         /* disable watch during event processing */
 837                         if (major(udev_device_get_devnum(dev)) != 0)
 838                                 udev_watch_end(event->udev, event->dev_db);
 839                 }
 840
 841                 if (major(udev_device_get_devnum(dev)) == 0 &&
 842                     streq(udev_device_get_action(dev), "move"))
 843                         udev_device_copy_properties(dev, event->dev_db);
 844
 845                 udev_rules_apply_to_event(rules, event,
 846                                           timeout_usec, timeout_warn_usec,
 847                                           properties_list,
 848                                           sigmask);
 849
 850                 /* rename a new network interface, if needed */
 851                 if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
 852                     event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
 853                         int r;
 854
 855                         r = rename_netif(event);
 856                         if (r < 0)
 857                                 log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
 858                                                   udev_device_get_sysname(dev), event->name);
 859                         else {
 860                                 r = udev_device_rename(dev, event->name);
 861                                 if (r < 0)
 862                                         log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
 863                                                           udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
 864                                 else
 865                                         log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
 866                         }
 867                 }
 868
 869                 if (major(udev_device_get_devnum(dev)) > 0) {
 870                         bool apply;
 871
 872                         /* remove/update possible left-over symlinks from old database entry */
 873                         if (event->dev_db != NULL)
 874                                 udev_node_update_old_links(dev, event->dev_db);
 875
 876                         if (!event->owner_set)
 877                                 event->uid = udev_device_get_devnode_uid(dev);
 878
 879                         if (!event->group_set)
 880                                 event->gid = udev_device_get_devnode_gid(dev);
 881
 882                         if (!event->mode_set) {
 883                                 if (udev_device_get_devnode_mode(dev) > 0) {
 884                                         /* kernel supplied value */
 885                                         event->mode = udev_device_get_devnode_mode(dev);
 886                                 } else if (event->gid > 0) {
 887                                         /* default 0660 if a group is assigned */
 888                                         event->mode = 0660;
 889                                 } else {
 890                                         /* default 0600 */
 891                                         event->mode = 0600;
 892                                 }
 893                         }
 894
 895                         apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
 896                         udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
 897                 }
 898
 899                 /* preserve old, or get new initialization timestamp */
 900                 udev_device_ensure_usec_initialized(event->dev, event->dev_db);
 901
 902                 /* (re)write database file */
 903                 udev_device_tag_index(dev, event->dev_db, true);
 904                 udev_device_update_db(dev);
 905                 udev_device_set_is_initialized(dev);
 906
 907                 event->dev_db = udev_device_unref(event->dev_db);
 908         }
 909 }
 910
 911 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) {
 912         struct udev_list_entry *list_entry;
 913
 914         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 915                 const char *cmd = udev_list_entry_get_name(list_entry);
 916                 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
 917
 918                 if (builtin_cmd < UDEV_BUILTIN_MAX) {
 919                         char command[UTIL_PATH_SIZE];
 920
 921                         udev_event_apply_format(event, cmd, command, sizeof(command));
 922                         udev_builtin_run(event->dev, builtin_cmd, command, false);
 923                 } else {
 924                         char program[UTIL_PATH_SIZE];
 925                         char **envp;
 926
 927                         if (event->exec_delay > 0) {
 928                                 log_debug("delay execution of '%s'", program);
 929                                 sleep(event->exec_delay);
 930                         }
 931
 932                         udev_event_apply_format(event, cmd, program, sizeof(program));
 933                         envp = udev_device_get_properties_envp(event->dev);
 934                         udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
 935                 }
 936         }
 937 }