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
  36 struct udev_event *udev_event_new(struct udev_device *dev) {
  37         struct udev *udev = udev_device_get_udev(dev);
  38         struct udev_event *event;
  39
  40         event = new0(struct udev_event, 1);
  41         if (event == NULL)
  42                 return NULL;
  43         event->dev = dev;
  44         event->udev = udev;
  45         udev_list_init(udev, &event->run_list, false);
  46         udev_list_init(udev, &event->seclabel_list, false);
  47         event->fd_signal = -1;
  48         event->birth_usec = now(CLOCK_MONOTONIC);
  49         return event;
  50 }
  51
  52 void udev_event_unref(struct udev_event *event) {
  53         if (event == NULL)
  54                 return;
  55         sd_rtnl_unref(event->rtnl);
  56         udev_list_cleanup(&event->run_list);
  57         udev_list_cleanup(&event->seclabel_list);
  58         free(event->program_result);
  59         free(event->name);
  60         free(event);
  61 }
  62
  63 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) {
  64         struct udev_device *dev = event->dev;
  65         enum subst_type {
  66                 SUBST_UNKNOWN,
  67                 SUBST_DEVNODE,
  68                 SUBST_ATTR,
  69                 SUBST_ENV,
  70                 SUBST_KERNEL,
  71                 SUBST_KERNEL_NUMBER,
  72                 SUBST_DRIVER,
  73                 SUBST_DEVPATH,
  74                 SUBST_ID,
  75                 SUBST_MAJOR,
  76                 SUBST_MINOR,
  77                 SUBST_RESULT,
  78                 SUBST_PARENT,
  79                 SUBST_NAME,
  80                 SUBST_LINKS,
  81                 SUBST_ROOT,
  82                 SUBST_SYS,
  83         };
  84         static const struct subst_map {
  85                 const char *name;
  86                 const char fmt;
  87                 enum subst_type type;
  88         } map[] = {
  89                 { .name = "devnode",  .fmt = 'N', .type = SUBST_DEVNODE },
  90                 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
  91                 { .name = "attr",     .fmt = 's', .type = SUBST_ATTR },
  92                 { .name = "sysfs",    .fmt = 's', .type = SUBST_ATTR },
  93                 { .name = "env",      .fmt = 'E', .type = SUBST_ENV },
  94                 { .name = "kernel",   .fmt = 'k', .type = SUBST_KERNEL },
  95                 { .name = "number",   .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
  96                 { .name = "driver",   .fmt = 'd', .type = SUBST_DRIVER },
  97                 { .name = "devpath",  .fmt = 'p', .type = SUBST_DEVPATH },
  98                 { .name = "id",       .fmt = 'b', .type = SUBST_ID },
  99                 { .name = "major",    .fmt = 'M', .type = SUBST_MAJOR },
 100                 { .name = "minor",    .fmt = 'm', .type = SUBST_MINOR },
 101                 { .name = "result",   .fmt = 'c', .type = SUBST_RESULT },
 102                 { .name = "parent",   .fmt = 'P', .type = SUBST_PARENT },
 103                 { .name = "name",     .fmt = 'D', .type = SUBST_NAME },
 104                 { .name = "links",    .fmt = 'L', .type = SUBST_LINKS },
 105                 { .name = "root",     .fmt = 'r', .type = SUBST_ROOT },
 106                 { .name = "sys",      .fmt = 'S', .type = SUBST_SYS },
 107         };
 108         const char *from;
 109         char *s;
 110         size_t l;
 111
 112         from = src;
 113         s = dest;
 114         l = size;
 115
 116         for (;;) {
 117                 enum subst_type type = SUBST_UNKNOWN;
 118                 char attrbuf[UTIL_PATH_SIZE];
 119                 char *attr = NULL;
 120
 121                 while (from[0] != '\0') {
 122                         if (from[0] == '$') {
 123                                 /* substitute named variable */
 124                                 unsigned int i;
 125
 126                                 if (from[1] == '$') {
 127                                         from++;
 128                                         goto copy;
 129                                 }
 130
 131                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 132                                         if (startswith(&from[1], map[i].name)) {
 133                                                 type = map[i].type;
 134                                                 from += strlen(map[i].name)+1;
 135                                                 goto subst;
 136                                         }
 137                                 }
 138                         } else if (from[0] == '%') {
 139                                 /* substitute format char */
 140                                 unsigned int i;
 141
 142                                 if (from[1] == '%') {
 143                                         from++;
 144                                         goto copy;
 145                                 }
 146
 147                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 148                                         if (from[1] == map[i].fmt) {
 149                                                 type = map[i].type;
 150                                                 from += 2;
 151                                                 goto subst;
 152                                         }
 153                                 }
 154                         }
 155 copy:
 156                         /* copy char */
 157                         if (l == 0)
 158                                 goto out;
 159                         s[0] = from[0];
 160                         from++;
 161                         s++;
 162                         l--;
 163                 }
 164
 165                 goto out;
 166 subst:
 167                 /* extract possible $format{attr} */
 168                 if (from[0] == '{') {
 169                         unsigned int i;
 170
 171                         from++;
 172                         for (i = 0; from[i] != '}'; i++) {
 173                                 if (from[i] == '\0') {
 174                                         log_error("missing closing brace for format '%s'", src);
 175                                         goto out;
 176                                 }
 177                         }
 178                         if (i >= sizeof(attrbuf))
 179                                 goto out;
 180                         memcpy(attrbuf, from, i);
 181                         attrbuf[i] = '\0';
 182                         from += i+1;
 183                         attr = attrbuf;
 184                 } else {
 185                         attr = NULL;
 186                 }
 187
 188                 switch (type) {
 189                 case SUBST_DEVPATH:
 190                         l = strpcpy(&s, l, udev_device_get_devpath(dev));
 191                         break;
 192                 case SUBST_KERNEL:
 193                         l = strpcpy(&s, l, udev_device_get_sysname(dev));
 194                         break;
 195                 case SUBST_KERNEL_NUMBER:
 196                         if (udev_device_get_sysnum(dev) == NULL)
 197                                 break;
 198                         l = strpcpy(&s, l, udev_device_get_sysnum(dev));
 199                         break;
 200                 case SUBST_ID:
 201                         if (event->dev_parent == NULL)
 202                                 break;
 203                         l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
 204                         break;
 205                 case SUBST_DRIVER: {
 206                         const char *driver;
 207
 208                         if (event->dev_parent == NULL)
 209                                 break;
 210
 211                         driver = udev_device_get_driver(event->dev_parent);
 212                         if (driver == NULL)
 213                                 break;
 214                         l = strpcpy(&s, l, driver);
 215                         break;
 216                 }
 217                 case SUBST_MAJOR: {
 218                         char num[UTIL_PATH_SIZE];
 219
 220                         sprintf(num, "%u", major(udev_device_get_devnum(dev)));
 221                         l = strpcpy(&s, l, num);
 222                         break;
 223                 }
 224                 case SUBST_MINOR: {
 225                         char num[UTIL_PATH_SIZE];
 226
 227                         sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
 228                         l = strpcpy(&s, l, num);
 229                         break;
 230                 }
 231                 case SUBST_RESULT: {
 232                         char *rest;
 233                         int i;
 234
 235                         if (event->program_result == NULL)
 236                                 break;
 237                         /* get part part of the result string */
 238                         i = 0;
 239                         if (attr != NULL)
 240                                 i = strtoul(attr, &rest, 10);
 241                         if (i > 0) {
 242                                 char result[UTIL_PATH_SIZE];
 243                                 char tmp[UTIL_PATH_SIZE];
 244                                 char *cpos;
 245
 246                                 strscpy(result, sizeof(result), event->program_result);
 247                                 cpos = result;
 248                                 while (--i) {
 249                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 250                                                 cpos++;
 251                                         while (isspace(cpos[0]))
 252                                                 cpos++;
 253                                         if (cpos[0] == '\0')
 254                                                 break;
 255                                 }
 256                                 if (i > 0) {
 257                                         log_error("requested part of result string not found");
 258                                         break;
 259                                 }
 260                                 strscpy(tmp, sizeof(tmp), cpos);
 261                                 /* %{2+}c copies the whole string from the second part on */
 262                                 if (rest[0] != '+') {
 263                                         cpos = strchr(tmp, ' ');
 264                                         if (cpos)
 265                                                 cpos[0] = '\0';
 266                                 }
 267                                 l = strpcpy(&s, l, tmp);
 268                         } else {
 269                                 l = strpcpy(&s, l, event->program_result);
 270                         }
 271                         break;
 272                 }
 273                 case SUBST_ATTR: {
 274                         const char *value = NULL;
 275                         char vbuf[UTIL_NAME_SIZE];
 276                         size_t len;
 277                         int count;
 278
 279                         if (attr == NULL) {
 280                                 log_error("missing file parameter for attr");
 281                                 break;
 282                         }
 283
 284                         /* try to read the value specified by "[dmi/id]product_name" */
 285                         if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
 286                                 value = vbuf;
 287
 288                         /* try to read the attribute the device */
 289                         if (value == NULL)
 290                                 value = udev_device_get_sysattr_value(event->dev, attr);
 291
 292                         /* try to read the attribute of the parent device, other matches have selected */
 293                         if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
 294                                 value = udev_device_get_sysattr_value(event->dev_parent, attr);
 295
 296                         if (value == NULL)
 297                                 break;
 298
 299                         /* strip trailing whitespace, and replace unwanted characters */
 300                         if (value != vbuf)
 301                                 strscpy(vbuf, sizeof(vbuf), value);
 302                         len = strlen(vbuf);
 303                         while (len > 0 && isspace(vbuf[--len]))
 304                                 vbuf[len] = '\0';
 305                         count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 306                         if (count > 0)
 307                                 log_debug("%i character(s) replaced" , count);
 308                         l = strpcpy(&s, l, vbuf);
 309                         break;
 310                 }
 311                 case SUBST_PARENT: {
 312                         struct udev_device *dev_parent;
 313                         const char *devnode;
 314
 315                         dev_parent = udev_device_get_parent(event->dev);
 316                         if (dev_parent == NULL)
 317                                 break;
 318                         devnode = udev_device_get_devnode(dev_parent);
 319                         if (devnode != NULL)
 320                                 l = strpcpy(&s, l, devnode + strlen("/dev/"));
 321                         break;
 322                 }
 323                 case SUBST_DEVNODE:
 324                         if (udev_device_get_devnode(dev) != NULL)
 325                                 l = strpcpy(&s, l, udev_device_get_devnode(dev));
 326                         break;
 327                 case SUBST_NAME:
 328                         if (event->name != NULL)
 329                                 l = strpcpy(&s, l, event->name);
 330                         else if (udev_device_get_devnode(dev) != NULL)
 331                                 l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/"));
 332                         else
 333                                 l = strpcpy(&s, l, udev_device_get_sysname(dev));
 334                         break;
 335                 case SUBST_LINKS: {
 336                         struct udev_list_entry *list_entry;
 337
 338                         list_entry = udev_device_get_devlinks_list_entry(dev);
 339                         if (list_entry == NULL)
 340                                 break;
 341                         l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/"));
 342                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 343                                 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL);
 344                         break;
 345                 }
 346                 case SUBST_ROOT:
 347                         l = strpcpy(&s, l, "/dev");
 348                         break;
 349                 case SUBST_SYS:
 350                         l = strpcpy(&s, l, "/sys");
 351                         break;
 352                 case SUBST_ENV:
 353                         if (attr == NULL) {
 354                                 break;
 355                         } else {
 356                                 const char *value;
 357
 358                                 value = udev_device_get_property_value(event->dev, attr);
 359                                 if (value == NULL)
 360                                         break;
 361                                 l = strpcpy(&s, l, value);
 362                                 break;
 363                         }
 364                 default:
 365                         log_error("unknown substitution type=%i", type);
 366                         break;
 367                 }
 368         }
 369
 370 out:
 371         s[0] = '\0';
 372         return l;
 373 }
 374
 375 static int spawn_exec(struct udev_event *event,
 376                       const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
 377                       int fd_stdout, int fd_stderr) {
 378         _cleanup_close_ int fd = -1;
 379
 380         /* discard child output or connect to pipe */
 381         fd = open("/dev/null", O_RDWR);
 382         if (fd >= 0) {
 383                 dup2(fd, STDIN_FILENO);
 384                 if (fd_stdout < 0)
 385                         dup2(fd, STDOUT_FILENO);
 386                 if (fd_stderr < 0)
 387                         dup2(fd, STDERR_FILENO);
 388         } else
 389                 log_error_errno(errno, "open /dev/null failed: %m");
 390
 391         /* connect pipes to std{out,err} */
 392         if (fd_stdout >= 0) {
 393                 dup2(fd_stdout, STDOUT_FILENO);
 394                 safe_close(fd_stdout);
 395         }
 396         if (fd_stderr >= 0) {
 397                 dup2(fd_stderr, STDERR_FILENO);
 398                 safe_close(fd_stderr);
 399         }
 400
 401         /* terminate child in case parent goes away */
 402         prctl(PR_SET_PDEATHSIG, SIGTERM);
 403
 404         /* restore original udev sigmask before exec */
 405         if (sigmask)
 406                 sigprocmask(SIG_SETMASK, sigmask, NULL);
 407
 408         execve(argv[0], argv, envp);
 409
 410         /* exec failed */
 411         log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
 412
 413         return -errno;
 414 }
 415
 416 static void spawn_read(struct udev_event *event,
 417                        usec_t timeout_usec,
 418                        const char *cmd,
 419                        int fd_stdout, int fd_stderr,
 420                        char *result, size_t ressize) {
 421         _cleanup_close_ int fd_ep = -1;
 422         struct epoll_event ep_outpipe = {
 423                 .events = EPOLLIN,
 424                 .data.ptr = &fd_stdout,
 425         };
 426         struct epoll_event ep_errpipe = {
 427                 .events = EPOLLIN,
 428                 .data.ptr = &fd_stderr,
 429         };
 430         size_t respos = 0;
 431         int r;
 432
 433         /* read from child if requested */
 434         if (fd_stdout < 0 && fd_stderr < 0)
 435                 return;
 436
 437         fd_ep = epoll_create1(EPOLL_CLOEXEC);
 438         if (fd_ep < 0) {
 439                 log_error_errno(errno, "error creating epoll fd: %m");
 440                 return;
 441         }
 442
 443         if (fd_stdout >= 0) {
 444                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
 445                 if (r < 0) {
 446                         log_error_errno(errno, "fail to add stdout fd to epoll: %m");
 447                         return;
 448                 }
 449         }
 450
 451         if (fd_stderr >= 0) {
 452                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
 453                 if (r < 0) {
 454                         log_error_errno(errno, "fail to add stderr fd to epoll: %m");
 455                         return;
 456                 }
 457         }
 458
 459         /* read child output */
 460         while (fd_stdout >= 0 || fd_stderr >= 0) {
 461                 int timeout;
 462                 int fdcount;
 463                 struct epoll_event ev[4];
 464                 int i;
 465
 466                 if (timeout_usec > 0) {
 467                         usec_t age_usec;
 468
 469                         age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
 470                         if (age_usec >= timeout_usec) {
 471                                 log_error("timeout '%s'", cmd);
 472                                 return;
 473                         }
 474                         timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
 475                 } else {
 476                         timeout = -1;
 477                 }
 478
 479                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
 480                 if (fdcount < 0) {
 481                         if (errno == EINTR)
 482                                 continue;
 483                         log_error_errno(errno, "failed to poll: %m");
 484                         return;
 485                 } else if (fdcount == 0) {
 486                         log_error("timeout '%s'", cmd);
 487                         return;
 488                 }
 489
 490                 for (i = 0; i < fdcount; i++) {
 491                         int *fd = (int *)ev[i].data.ptr;
 492
 493                         if (*fd < 0)
 494                                 continue;
 495
 496                         if (ev[i].events & EPOLLIN) {
 497                                 ssize_t count;
 498                                 char buf[4096];
 499
 500                                 count = read(*fd, buf, sizeof(buf)-1);
 501                                 if (count <= 0)
 502                                         continue;
 503                                 buf[count] = '\0';
 504
 505                                 /* store stdout result */
 506                                 if (result != NULL && *fd == fd_stdout) {
 507                                         if (respos + count < ressize) {
 508                                                 memcpy(&result[respos], buf, count);
 509                                                 respos += count;
 510                                         } else {
 511                                                 log_error("'%s' ressize %zu too short", cmd, ressize);
 512                                         }
 513                                 }
 514
 515                                 /* log debug output only if we watch stderr */
 516                                 if (fd_stderr >= 0) {
 517                                         char *pos;
 518                                         char *line;
 519
 520                                         pos = buf;
 521                                         while ((line = strsep(&pos, "\n"))) {
 522                                                 if (pos != NULL || line[0] != '\0')
 523                                                         log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
 524                                         }
 525                                 }
 526                         } else if (ev[i].events & EPOLLHUP) {
 527                                 r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
 528                                 if (r < 0) {
 529                                         log_error_errno(errno, "failed to remove fd from epoll: %m");
 530                                         return;
 531                                 }
 532                                 *fd = -1;
 533                         }
 534                 }
 535         }
 536
 537         /* return the child's stdout string */
 538         if (result != NULL)
 539                 result[respos] = '\0';
 540 }
 541
 542 static int spawn_wait(struct udev_event *event,
 543                       usec_t timeout_usec,
 544                       usec_t timeout_warn_usec,
 545                       const char *cmd, pid_t pid) {
 546         struct pollfd pfd[1];
 547         int err = 0;
 548
 549         pfd[0].events = POLLIN;
 550         pfd[0].fd = event->fd_signal;
 551
 552         while (pid > 0) {
 553                 int timeout;
 554                 int timeout_warn = 0;
 555                 int fdcount;
 556
 557                 if (timeout_usec > 0) {
 558                         usec_t age_usec;
 559
 560                         age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
 561                         if (age_usec >= timeout_usec)
 562                                 timeout = 1000;
 563                         else {
 564                                 if (timeout_warn_usec > 0)
 565                                         timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
 566
 567                                 timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
 568                         }
 569                 } else {
 570                         timeout = -1;
 571                 }
 572
 573                 fdcount = poll(pfd, 1, timeout_warn);
 574                 if (fdcount < 0) {
 575                         if (errno == EINTR)
 576                                 continue;
 577                         err = -errno;
 578                         log_error_errno(errno, "failed to poll: %m");
 579                         goto out;
 580                 }
 581                 if (fdcount == 0) {
 582                         log_warning("slow: '%s' ["PID_FMT"]", cmd, pid);
 583
 584                         fdcount = poll(pfd, 1, timeout);
 585                         if (fdcount < 0) {
 586                                 if (errno == EINTR)
 587                                         continue;
 588                                 err = -errno;
 589                                 log_error_errno(errno, "failed to poll: %m");
 590                                 goto out;
 591                         }
 592                         if (fdcount == 0) {
 593                                 log_error("timeout: killing '%s' ["PID_FMT"]", cmd, pid);
 594                                 kill(pid, SIGKILL);
 595                         }
 596                 }
 597
 598                 if (pfd[0].revents & POLLIN) {
 599                         struct signalfd_siginfo fdsi;
 600                         int status;
 601                         ssize_t size;
 602
 603                         size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
 604                         if (size != sizeof(struct signalfd_siginfo))
 605                                 continue;
 606
 607                         switch (fdsi.ssi_signo) {
 608                         case SIGTERM:
 609                                 event->sigterm = true;
 610                                 break;
 611                         case SIGCHLD:
 612                                 if (waitpid(pid, &status, WNOHANG) < 0)
 613                                         break;
 614                                 if (WIFEXITED(status)) {
 615                                         log_debug("'%s' ["PID_FMT"] exit with return code %i", cmd, pid, WEXITSTATUS(status));
 616                                         if (WEXITSTATUS(status) != 0)
 617                                                 err = -1;
 618                                 } else if (WIFSIGNALED(status)) {
 619                                         log_error("'%s' ["PID_FMT"] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
 620                                         err = -1;
 621                                 } else if (WIFSTOPPED(status)) {
 622                                         log_error("'%s' ["PID_FMT"] stopped", cmd, pid);
 623                                         err = -1;
 624                                 } else if (WIFCONTINUED(status)) {
 625                                         log_error("'%s' ["PID_FMT"] continued", cmd, pid);
 626                                         err = -1;
 627                                 } else {
 628                                         log_error("'%s' ["PID_FMT"] exit with status 0x%04x", cmd, pid, status);
 629                                         err = -1;
 630                                 }
 631                                 pid = 0;
 632                                 break;
 633                         }
 634                 }
 635         }
 636 out:
 637         return err;
 638 }
 639
 640 int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
 641         int i = 0;
 642         char *pos;
 643
 644         if (strchr(cmd, ' ') == NULL) {
 645                 argv[i++] = cmd;
 646                 goto out;
 647         }
 648
 649         pos = cmd;
 650         while (pos != NULL && pos[0] != '\0') {
 651                 if (pos[0] == '\'') {
 652                         /* do not separate quotes */
 653                         pos++;
 654                         argv[i] = strsep(&pos, "\'");
 655                         if (pos != NULL)
 656                                 while (pos[0] == ' ')
 657                                         pos++;
 658                 } else {
 659                         argv[i] = strsep(&pos, " ");
 660                         if (pos != NULL)
 661                                 while (pos[0] == ' ')
 662                                         pos++;
 663                 }
 664                 i++;
 665         }
 666 out:
 667         argv[i] = NULL;
 668         if (argc)
 669                 *argc = i;
 670         return 0;
 671 }
 672
 673 int udev_event_spawn(struct udev_event *event,
 674                      usec_t timeout_usec,
 675                      usec_t timeout_warn_usec,
 676                      const char *cmd, char **envp, const sigset_t *sigmask,
 677                      char *result, size_t ressize) {
 678         int outpipe[2] = {-1, -1};
 679         int errpipe[2] = {-1, -1};
 680         pid_t pid;
 681         char arg[UTIL_PATH_SIZE];
 682         char *argv[128];
 683         char program[UTIL_PATH_SIZE];
 684         int err = 0;
 685
 686         strscpy(arg, sizeof(arg), cmd);
 687         udev_build_argv(event->udev, arg, NULL, argv);
 688
 689         /* pipes from child to parent */
 690         if (result != NULL || log_get_max_level() >= LOG_INFO) {
 691                 if (pipe2(outpipe, O_NONBLOCK) != 0) {
 692                         err = -errno;
 693                         log_error_errno(errno, "pipe failed: %m");
 694                         goto out;
 695                 }
 696         }
 697         if (log_get_max_level() >= LOG_INFO) {
 698                 if (pipe2(errpipe, O_NONBLOCK) != 0) {
 699                         err = -errno;
 700                         log_error_errno(errno, "pipe failed: %m");
 701                         goto out;
 702                 }
 703         }
 704
 705         /* allow programs in /usr/lib/udev/ to be called without the path */
 706         if (argv[0][0] != '/') {
 707                 strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
 708                 argv[0] = program;
 709         }
 710
 711         pid = fork();
 712         switch(pid) {
 713         case 0:
 714                 /* child closes parent's ends of pipes */
 715                 if (outpipe[READ_END] >= 0) {
 716                         close(outpipe[READ_END]);
 717                         outpipe[READ_END] = -1;
 718                 }
 719                 if (errpipe[READ_END] >= 0) {
 720                         close(errpipe[READ_END]);
 721                         errpipe[READ_END] = -1;
 722                 }
 723
 724                 log_debug("starting '%s'", cmd);
 725
 726                 spawn_exec(event, cmd, argv, envp, sigmask,
 727                            outpipe[WRITE_END], errpipe[WRITE_END]);
 728
 729                 _exit(2 );
 730         case -1:
 731                 log_error_errno(errno, "fork of '%s' failed: %m", cmd);
 732                 err = -1;
 733                 goto out;
 734         default:
 735                 /* parent closed child's ends of pipes */
 736                 if (outpipe[WRITE_END] >= 0) {
 737                         close(outpipe[WRITE_END]);
 738                         outpipe[WRITE_END] = -1;
 739                 }
 740                 if (errpipe[WRITE_END] >= 0) {
 741                         close(errpipe[WRITE_END]);
 742                         errpipe[WRITE_END] = -1;
 743                 }
 744
 745                 spawn_read(event,
 746                            timeout_usec,
 747                            cmd,
 748                            outpipe[READ_END], errpipe[READ_END],
 749                            result, ressize);
 750
 751                 err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
 752         }
 753
 754 out:
 755         if (outpipe[READ_END] >= 0)
 756                 close(outpipe[READ_END]);
 757         if (outpipe[WRITE_END] >= 0)
 758                 close(outpipe[WRITE_END]);
 759         if (errpipe[READ_END] >= 0)
 760                 close(errpipe[READ_END]);
 761         if (errpipe[WRITE_END] >= 0)
 762                 close(errpipe[WRITE_END]);
 763         return err;
 764 }
 765
 766 static int rename_netif(struct udev_event *event) {
 767         struct udev_device *dev = event->dev;
 768         char name[IFNAMSIZ];
 769         const char *oldname;
 770         int r;
 771
 772         oldname = udev_device_get_sysname(dev);
 773
 774         strscpy(name, IFNAMSIZ, event->name);
 775
 776         r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
 777         if (r < 0)
 778                 return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
 779
 780         log_debug("renamed network interface '%s' to '%s'", oldname, name);
 781
 782         return 0;
 783 }
 784
 785 void udev_event_execute_rules(struct udev_event *event,
 786                               usec_t timeout_usec, usec_t timeout_warn_usec,
 787                               struct udev_list *properties_list,
 788                               struct udev_rules *rules,
 789                               const sigset_t *sigmask) {
 790         struct udev_device *dev = event->dev;
 791
 792         if (udev_device_get_subsystem(dev) == NULL)
 793                 return;
 794
 795         if (streq(udev_device_get_action(dev), "remove")) {
 796                 udev_device_read_db(dev);
 797                 udev_device_delete_db(dev);
 798                 udev_device_tag_index(dev, NULL, false);
 799
 800                 if (major(udev_device_get_devnum(dev)) != 0)
 801                         udev_watch_end(event->udev, dev);
 802
 803                 udev_rules_apply_to_event(rules, event,
 804                                           timeout_usec, timeout_warn_usec,
 805                                           properties_list,
 806                                           sigmask);
 807
 808                 if (major(udev_device_get_devnum(dev)) != 0)
 809                         udev_node_remove(dev);
 810         } else {
 811                 event->dev_db = udev_device_shallow_clone(dev);
 812                 if (event->dev_db != NULL) {
 813                         udev_device_read_db(event->dev_db);
 814                         udev_device_set_info_loaded(event->dev_db);
 815
 816                         /* disable watch during event processing */
 817                         if (major(udev_device_get_devnum(dev)) != 0)
 818                                 udev_watch_end(event->udev, event->dev_db);
 819                 }
 820
 821                 if (major(udev_device_get_devnum(dev)) == 0 &&
 822                     streq(udev_device_get_action(dev), "move")) {
 823                         struct udev_list_entry *entry;
 824
 825                         for ((entry = udev_device_get_properties_list_entry(event->dev_db)); entry; entry = udev_list_entry_get_next(entry)) {
 826                                 const char *key, *value;
 827                                 struct udev_list_entry *property;
 828
 829                                 key = udev_list_entry_get_name(entry);
 830                                 value = udev_list_entry_get_value(entry);
 831
 832                                 property = udev_device_add_property(dev, key, value);
 833                                 udev_list_entry_set_num(property, true);
 834                         }
 835                 }
 836
 837                 udev_rules_apply_to_event(rules, event,
 838                                           timeout_usec, timeout_warn_usec,
 839                                           properties_list,
 840                                           sigmask);
 841
 842                 /* rename a new network interface, if needed */
 843                 if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
 844                     event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
 845                         int r;
 846
 847                         r = rename_netif(event);
 848                         if (r < 0)
 849                                 log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
 850                                                   udev_device_get_sysname(dev), event->name);
 851                         else {
 852                                 r = udev_device_rename(dev, event->name);
 853                                 if (r < 0)
 854                                         log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
 855                                                           udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
 856                                 else
 857                                         log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
 858                         }
 859                 }
 860
 861                 if (major(udev_device_get_devnum(dev)) > 0) {
 862                         bool apply;
 863
 864                         /* remove/update possible left-over symlinks from old database entry */
 865                         if (event->dev_db != NULL)
 866                                 udev_node_update_old_links(dev, event->dev_db);
 867
 868                         if (!event->owner_set)
 869                                 event->uid = udev_device_get_devnode_uid(dev);
 870
 871                         if (!event->group_set)
 872                                 event->gid = udev_device_get_devnode_gid(dev);
 873
 874                         if (!event->mode_set) {
 875                                 if (udev_device_get_devnode_mode(dev) > 0) {
 876                                         /* kernel supplied value */
 877                                         event->mode = udev_device_get_devnode_mode(dev);
 878                                 } else if (event->gid > 0) {
 879                                         /* default 0660 if a group is assigned */
 880                                         event->mode = 0660;
 881                                 } else {
 882                                         /* default 0600 */
 883                                         event->mode = 0600;
 884                                 }
 885                         }
 886
 887                         apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
 888                         udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
 889                 }
 890
 891                 /* preserve old, or get new initialization timestamp */
 892                 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
 893                         udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
 894                 else if (udev_device_get_usec_initialized(event->dev) == 0)
 895                         udev_device_set_usec_initialized(event->dev, now(CLOCK_MONOTONIC));
 896
 897                 /* (re)write database file */
 898                 udev_device_update_db(dev);
 899                 udev_device_tag_index(dev, event->dev_db, true);
 900                 udev_device_set_is_initialized(dev);
 901
 902                 udev_device_unref(event->dev_db);
 903                 event->dev_db = NULL;
 904         }
 905 }
 906
 907 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) {
 908         struct udev_list_entry *list_entry;
 909
 910         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 911                 const char *cmd = udev_list_entry_get_name(list_entry);
 912                 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
 913
 914                 if (builtin_cmd < UDEV_BUILTIN_MAX) {
 915                         char command[UTIL_PATH_SIZE];
 916
 917                         udev_event_apply_format(event, cmd, command, sizeof(command));
 918                         udev_builtin_run(event->dev, builtin_cmd, command, false);
 919                 } else {
 920                         char program[UTIL_PATH_SIZE];
 921                         char **envp;
 922
 923                         if (event->exec_delay > 0) {
 924                                 log_debug("delay execution of '%s'", program);
 925                                 sleep(event->exec_delay);
 926                         }
 927
 928                         udev_event_apply_format(event, cmd, program, sizeof(program));
 929                         envp = udev_device_get_properties_envp(event->dev);
 930                         udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
 931                 }
 932         }
 933 }