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 "rtnl-util.h"
  34 #include "event-util.h"
  35 #include "formats-util.h"
  36 #include "process-util.h"
  37 #include "signal-util.h"
  38 #include "udev.h"
  39
  40 typedef struct Spawn {
  41         const char *cmd;
  42         pid_t pid;
  43         usec_t timeout_warn;
  44         usec_t timeout;
  45 } Spawn;
  46
  47 struct udev_event *udev_event_new(struct udev_device *dev) {
  48         struct udev *udev = udev_device_get_udev(dev);
  49         struct udev_event *event;
  50
  51         event = new0(struct udev_event, 1);
  52         if (event == NULL)
  53                 return NULL;
  54         event->dev = dev;
  55         event->udev = udev;
  56         udev_list_init(udev, &event->run_list, false);
  57         udev_list_init(udev, &event->seclabel_list, false);
  58         event->birth_usec = clock_boottime_or_monotonic();
  59         return event;
  60 }
  61
  62 void udev_event_unref(struct udev_event *event) {
  63         if (event == NULL)
  64                 return;
  65         sd_rtnl_unref(event->rtnl);
  66         udev_list_cleanup(&event->run_list);
  67         udev_list_cleanup(&event->seclabel_list);
  68         free(event->program_result);
  69         free(event->name);
  70         free(event);
  71 }
  72
  73 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) {
  74         struct udev_device *dev = event->dev;
  75         enum subst_type {
  76                 SUBST_UNKNOWN,
  77                 SUBST_DEVNODE,
  78                 SUBST_ATTR,
  79                 SUBST_ENV,
  80                 SUBST_KERNEL,
  81                 SUBST_KERNEL_NUMBER,
  82                 SUBST_DRIVER,
  83                 SUBST_DEVPATH,
  84                 SUBST_ID,
  85                 SUBST_MAJOR,
  86                 SUBST_MINOR,
  87                 SUBST_RESULT,
  88                 SUBST_PARENT,
  89                 SUBST_NAME,
  90                 SUBST_LINKS,
  91                 SUBST_ROOT,
  92                 SUBST_SYS,
  93         };
  94         static const struct subst_map {
  95                 const char *name;
  96                 const char fmt;
  97                 enum subst_type type;
  98         } map[] = {
  99                 { .name = "devnode",  .fmt = 'N', .type = SUBST_DEVNODE },
 100                 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
 101                 { .name = "attr",     .fmt = 's', .type = SUBST_ATTR },
 102                 { .name = "sysfs",    .fmt = 's', .type = SUBST_ATTR },
 103                 { .name = "env",      .fmt = 'E', .type = SUBST_ENV },
 104                 { .name = "kernel",   .fmt = 'k', .type = SUBST_KERNEL },
 105                 { .name = "number",   .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
 106                 { .name = "driver",   .fmt = 'd', .type = SUBST_DRIVER },
 107                 { .name = "devpath",  .fmt = 'p', .type = SUBST_DEVPATH },
 108                 { .name = "id",       .fmt = 'b', .type = SUBST_ID },
 109                 { .name = "major",    .fmt = 'M', .type = SUBST_MAJOR },
 110                 { .name = "minor",    .fmt = 'm', .type = SUBST_MINOR },
 111                 { .name = "result",   .fmt = 'c', .type = SUBST_RESULT },
 112                 { .name = "parent",   .fmt = 'P', .type = SUBST_PARENT },
 113                 { .name = "name",     .fmt = 'D', .type = SUBST_NAME },
 114                 { .name = "links",    .fmt = 'L', .type = SUBST_LINKS },
 115                 { .name = "root",     .fmt = 'r', .type = SUBST_ROOT },
 116                 { .name = "sys",      .fmt = 'S', .type = SUBST_SYS },
 117         };
 118         const char *from;
 119         char *s;
 120         size_t l;
 121
 122         from = src;
 123         s = dest;
 124         l = size;
 125
 126         for (;;) {
 127                 enum subst_type type = SUBST_UNKNOWN;
 128                 char attrbuf[UTIL_PATH_SIZE];
 129                 char *attr = NULL;
 130
 131                 while (from[0] != '\0') {
 132                         if (from[0] == '$') {
 133                                 /* substitute named variable */
 134                                 unsigned int i;
 135
 136                                 if (from[1] == '$') {
 137                                         from++;
 138                                         goto copy;
 139                                 }
 140
 141                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 142                                         if (startswith(&from[1], map[i].name)) {
 143                                                 type = map[i].type;
 144                                                 from += strlen(map[i].name)+1;
 145                                                 goto subst;
 146                                         }
 147                                 }
 148                         } else if (from[0] == '%') {
 149                                 /* substitute format char */
 150                                 unsigned int i;
 151
 152                                 if (from[1] == '%') {
 153                                         from++;
 154                                         goto copy;
 155                                 }
 156
 157                                 for (i = 0; i < ELEMENTSOF(map); i++) {
 158                                         if (from[1] == map[i].fmt) {
 159                                                 type = map[i].type;
 160                                                 from += 2;
 161                                                 goto subst;
 162                                         }
 163                                 }
 164                         }
 165 copy:
 166                         /* copy char */
 167                         if (l == 0)
 168                                 goto out;
 169                         s[0] = from[0];
 170                         from++;
 171                         s++;
 172                         l--;
 173                 }
 174
 175                 goto out;
 176 subst:
 177                 /* extract possible $format{attr} */
 178                 if (from[0] == '{') {
 179                         unsigned int i;
 180
 181                         from++;
 182                         for (i = 0; from[i] != '}'; i++) {
 183                                 if (from[i] == '\0') {
 184                                         log_error("missing closing brace for format '%s'", src);
 185                                         goto out;
 186                                 }
 187                         }
 188                         if (i >= sizeof(attrbuf))
 189                                 goto out;
 190                         memcpy(attrbuf, from, i);
 191                         attrbuf[i] = '\0';
 192                         from += i+1;
 193                         attr = attrbuf;
 194                 } else {
 195                         attr = NULL;
 196                 }
 197
 198                 switch (type) {
 199                 case SUBST_DEVPATH:
 200                         l = strpcpy(&s, l, udev_device_get_devpath(dev));
 201                         break;
 202                 case SUBST_KERNEL:
 203                         l = strpcpy(&s, l, udev_device_get_sysname(dev));
 204                         break;
 205                 case SUBST_KERNEL_NUMBER:
 206                         if (udev_device_get_sysnum(dev) == NULL)
 207                                 break;
 208                         l = strpcpy(&s, l, udev_device_get_sysnum(dev));
 209                         break;
 210                 case SUBST_ID:
 211                         if (event->dev_parent == NULL)
 212                                 break;
 213                         l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
 214                         break;
 215                 case SUBST_DRIVER: {
 216                         const char *driver;
 217
 218                         if (event->dev_parent == NULL)
 219                                 break;
 220
 221                         driver = udev_device_get_driver(event->dev_parent);
 222                         if (driver == NULL)
 223                                 break;
 224                         l = strpcpy(&s, l, driver);
 225                         break;
 226                 }
 227                 case SUBST_MAJOR: {
 228                         char num[UTIL_PATH_SIZE];
 229
 230                         sprintf(num, "%u", major(udev_device_get_devnum(dev)));
 231                         l = strpcpy(&s, l, num);
 232                         break;
 233                 }
 234                 case SUBST_MINOR: {
 235                         char num[UTIL_PATH_SIZE];
 236
 237                         sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
 238                         l = strpcpy(&s, l, num);
 239                         break;
 240                 }
 241                 case SUBST_RESULT: {
 242                         char *rest;
 243                         int i;
 244
 245                         if (event->program_result == NULL)
 246                                 break;
 247                         /* get part part of the result string */
 248                         i = 0;
 249                         if (attr != NULL)
 250                                 i = strtoul(attr, &rest, 10);
 251                         if (i > 0) {
 252                                 char result[UTIL_PATH_SIZE];
 253                                 char tmp[UTIL_PATH_SIZE];
 254                                 char *cpos;
 255
 256                                 strscpy(result, sizeof(result), event->program_result);
 257                                 cpos = result;
 258                                 while (--i) {
 259                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 260                                                 cpos++;
 261                                         while (isspace(cpos[0]))
 262                                                 cpos++;
 263                                         if (cpos[0] == '\0')
 264                                                 break;
 265                                 }
 266                                 if (i > 0) {
 267                                         log_error("requested part of result string not found");
 268                                         break;
 269                                 }
 270                                 strscpy(tmp, sizeof(tmp), cpos);
 271                                 /* %{2+}c copies the whole string from the second part on */
 272                                 if (rest[0] != '+') {
 273                                         cpos = strchr(tmp, ' ');
 274                                         if (cpos)
 275                                                 cpos[0] = '\0';
 276                                 }
 277                                 l = strpcpy(&s, l, tmp);
 278                         } else {
 279                                 l = strpcpy(&s, l, event->program_result);
 280                         }
 281                         break;
 282                 }
 283                 case SUBST_ATTR: {
 284                         const char *value = NULL;
 285                         char vbuf[UTIL_NAME_SIZE];
 286                         size_t len;
 287                         int count;
 288
 289                         if (attr == NULL) {
 290                                 log_error("missing file parameter for attr");
 291                                 break;
 292                         }
 293
 294                         /* try to read the value specified by "[dmi/id]product_name" */
 295                         if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
 296                                 value = vbuf;
 297
 298                         /* try to read the attribute the device */
 299                         if (value == NULL)
 300                                 value = udev_device_get_sysattr_value(event->dev, attr);
 301
 302                         /* try to read the attribute of the parent device, other matches have selected */
 303                         if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
 304                                 value = udev_device_get_sysattr_value(event->dev_parent, attr);
 305
 306                         if (value == NULL)
 307                                 break;
 308
 309                         /* strip trailing whitespace, and replace unwanted characters */
 310                         if (value != vbuf)
 311                                 strscpy(vbuf, sizeof(vbuf), value);
 312                         len = strlen(vbuf);
 313                         while (len > 0 && isspace(vbuf[--len]))
 314                                 vbuf[len] = '\0';
 315                         count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
 316                         if (count > 0)
 317                                 log_debug("%i character(s) replaced" , count);
 318                         l = strpcpy(&s, l, vbuf);
 319                         break;
 320                 }
 321                 case SUBST_PARENT: {
 322                         struct udev_device *dev_parent;
 323                         const char *devnode;
 324
 325                         dev_parent = udev_device_get_parent(event->dev);
 326                         if (dev_parent == NULL)
 327                                 break;
 328                         devnode = udev_device_get_devnode(dev_parent);
 329                         if (devnode != NULL)
 330                                 l = strpcpy(&s, l, devnode + strlen("/dev/"));
 331                         break;
 332                 }
 333                 case SUBST_DEVNODE:
 334                         if (udev_device_get_devnode(dev) != NULL)
 335                                 l = strpcpy(&s, l, udev_device_get_devnode(dev));
 336                         break;
 337                 case SUBST_NAME:
 338                         if (event->name != NULL)
 339                                 l = strpcpy(&s, l, event->name);
 340                         else if (udev_device_get_devnode(dev) != NULL)
 341                                 l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/"));
 342                         else
 343                                 l = strpcpy(&s, l, udev_device_get_sysname(dev));
 344                         break;
 345                 case SUBST_LINKS: {
 346                         struct udev_list_entry *list_entry;
 347
 348                         list_entry = udev_device_get_devlinks_list_entry(dev);
 349                         if (list_entry == NULL)
 350                                 break;
 351                         l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/"));
 352                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 353                                 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL);
 354                         break;
 355                 }
 356                 case SUBST_ROOT:
 357                         l = strpcpy(&s, l, "/dev");
 358                         break;
 359                 case SUBST_SYS:
 360                         l = strpcpy(&s, l, "/sys");
 361                         break;
 362                 case SUBST_ENV:
 363                         if (attr == NULL) {
 364                                 break;
 365                         } else {
 366                                 const char *value;
 367
 368                                 value = udev_device_get_property_value(event->dev, attr);
 369                                 if (value == NULL)
 370                                         break;
 371                                 l = strpcpy(&s, l, value);
 372                                 break;
 373                         }
 374                 default:
 375                         log_error("unknown substitution type=%i", type);
 376                         break;
 377                 }
 378         }
 379
 380 out:
 381         s[0] = '\0';
 382         return l;
 383 }
 384
 385 static int spawn_exec(struct udev_event *event,
 386                       const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
 387                       int fd_stdout, int fd_stderr) {
 388         _cleanup_close_ int fd = -1;
 389
 390         /* discard child output or connect to pipe */
 391         fd = open("/dev/null", O_RDWR);
 392         if (fd >= 0) {
 393                 dup2(fd, STDIN_FILENO);
 394                 if (fd_stdout < 0)
 395                         dup2(fd, STDOUT_FILENO);
 396                 if (fd_stderr < 0)
 397                         dup2(fd, STDERR_FILENO);
 398         } else
 399                 log_error_errno(errno, "open /dev/null failed: %m");
 400
 401         /* connect pipes to std{out,err} */
 402         if (fd_stdout >= 0) {
 403                 dup2(fd_stdout, STDOUT_FILENO);
 404                 safe_close(fd_stdout);
 405         }
 406         if (fd_stderr >= 0) {
 407                 dup2(fd_stderr, STDERR_FILENO);
 408                 safe_close(fd_stderr);
 409         }
 410
 411         /* terminate child in case parent goes away */
 412         prctl(PR_SET_PDEATHSIG, SIGTERM);
 413
 414         /* restore original udev sigmask before exec */
 415         if (sigmask)
 416                 sigprocmask(SIG_SETMASK, sigmask, NULL);
 417
 418         execve(argv[0], argv, envp);
 419
 420         /* exec failed */
 421         log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
 422
 423         return -errno;
 424 }
 425
 426 static void spawn_read(struct udev_event *event,
 427                        usec_t timeout_usec,
 428                        const char *cmd,
 429                        int fd_stdout, int fd_stderr,
 430                        char *result, size_t ressize) {
 431         _cleanup_close_ int fd_ep = -1;
 432         struct epoll_event ep_outpipe = {
 433                 .events = EPOLLIN,
 434                 .data.ptr = &fd_stdout,
 435         };
 436         struct epoll_event ep_errpipe = {
 437                 .events = EPOLLIN,
 438                 .data.ptr = &fd_stderr,
 439         };
 440         size_t respos = 0;
 441         int r;
 442
 443         /* read from child if requested */
 444         if (fd_stdout < 0 && fd_stderr < 0)
 445                 return;
 446
 447         fd_ep = epoll_create1(EPOLL_CLOEXEC);
 448         if (fd_ep < 0) {
 449                 log_error_errno(errno, "error creating epoll fd: %m");
 450                 return;
 451         }
 452
 453         if (fd_stdout >= 0) {
 454                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
 455                 if (r < 0) {
 456                         log_error_errno(errno, "fail to add stdout fd to epoll: %m");
 457                         return;
 458                 }
 459         }
 460
 461         if (fd_stderr >= 0) {
 462                 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
 463                 if (r < 0) {
 464                         log_error_errno(errno, "fail to add stderr fd to epoll: %m");
 465                         return;
 466                 }
 467         }
 468
 469         /* read child output */
 470         while (fd_stdout >= 0 || fd_stderr >= 0) {
 471                 int timeout;
 472                 int fdcount;
 473                 struct epoll_event ev[4];
 474                 int i;
 475
 476                 if (timeout_usec > 0) {
 477                         usec_t age_usec;
 478
 479                         age_usec = clock_boottime_or_monotonic() - event->birth_usec;
 480                         if (age_usec >= timeout_usec) {
 481                                 log_error("timeout '%s'", cmd);
 482                                 return;
 483                         }
 484                         timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
 485                 } else {
 486                         timeout = -1;
 487                 }
 488
 489                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
 490                 if (fdcount < 0) {
 491                         if (errno == EINTR)
 492                                 continue;
 493                         log_error_errno(errno, "failed to poll: %m");
 494                         return;
 495                 } else if (fdcount == 0) {
 496                         log_error("timeout '%s'", cmd);
 497                         return;
 498                 }
 499
 500                 for (i = 0; i < fdcount; i++) {
 501                         int *fd = (int *)ev[i].data.ptr;
 502
 503                         if (*fd < 0)
 504                                 continue;
 505
 506                         if (ev[i].events & EPOLLIN) {
 507                                 ssize_t count;
 508                                 char buf[4096];
 509
 510                                 count = read(*fd, buf, sizeof(buf)-1);
 511                                 if (count <= 0)
 512                                         continue;
 513                                 buf[count] = '\0';
 514
 515                                 /* store stdout result */
 516                                 if (result != NULL && *fd == fd_stdout) {
 517                                         if (respos + count < ressize) {
 518                                                 memcpy(&result[respos], buf, count);
 519                                                 respos += count;
 520                                         } else {
 521                                                 log_error("'%s' ressize %zu too short", cmd, ressize);
 522                                         }
 523                                 }
 524
 525                                 /* log debug output only if we watch stderr */
 526                                 if (fd_stderr >= 0) {
 527                                         char *pos;
 528                                         char *line;
 529
 530                                         pos = buf;
 531                                         while ((line = strsep(&pos, "\n"))) {
 532                                                 if (pos != NULL || line[0] != '\0')
 533                                                         log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
 534                                         }
 535                                 }
 536                         } else if (ev[i].events & EPOLLHUP) {
 537                                 r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
 538                                 if (r < 0) {
 539                                         log_error_errno(errno, "failed to remove fd from epoll: %m");
 540                                         return;
 541                                 }
 542                                 *fd = -1;
 543                         }
 544                 }
 545         }
 546
 547         /* return the child's stdout string */
 548         if (result != NULL)
 549                 result[respos] = '\0';
 550 }
 551
 552 static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
 553         Spawn *spawn = userdata;
 554         char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
 555
 556         assert(spawn);
 557
 558         kill_and_sigcont(spawn->pid, SIGKILL);
 559
 560         log_error("spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
 561                   format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
 562
 563         return 1;
 564 }
 565
 566 static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
 567         Spawn *spawn = userdata;
 568         char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
 569
 570         assert(spawn);
 571
 572         log_warning("spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
 573                     format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
 574
 575         return 1;
 576 }
 577
 578 static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
 579         Spawn *spawn = userdata;
 580
 581         assert(spawn);
 582
 583         switch (si->si_code) {
 584         case CLD_EXITED:
 585                 if (si->si_status != 0)
 586                         log_warning("process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
 587                 else {
 588                         log_debug("process '%s' succeeded.", spawn->cmd);
 589                         sd_event_exit(sd_event_source_get_event(s), 0);
 590
 591                         return 1;
 592                 }
 593
 594                 break;
 595         case CLD_KILLED:
 596         case CLD_DUMPED:
 597                 log_warning("process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
 598
 599                 break;
 600         default:
 601                 log_error("process '%s' failed due to unknown reason.", spawn->cmd);
 602         }
 603
 604         sd_event_exit(sd_event_source_get_event(s), -EIO);
 605
 606         return 1;
 607 }
 608
 609 static int spawn_wait(struct udev_event *event,
 610                       usec_t timeout_usec,
 611                       usec_t timeout_warn_usec,
 612                       const char *cmd, pid_t pid) {
 613         Spawn spawn = {
 614                 .cmd = cmd,
 615                 .pid = pid,
 616         };
 617         _cleanup_event_unref_ sd_event *e = NULL;
 618         int r, ret;
 619
 620         r = sd_event_new(&e);
 621         if (r < 0)
 622                 return r;
 623
 624         if (timeout_usec > 0) {
 625                 usec_t usec, age_usec;
 626
 627                 usec = now(clock_boottime_or_monotonic());
 628                 age_usec = usec - event->birth_usec;
 629                 if (age_usec < timeout_usec) {
 630                         if (timeout_warn_usec > 0 && timeout_warn_usec < timeout_usec && age_usec < timeout_warn_usec) {
 631                                 spawn.timeout_warn = timeout_warn_usec - age_usec;
 632
 633                                 r =  sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
 634                                                        usec + spawn.timeout_warn, USEC_PER_SEC,
 635                                                        on_spawn_timeout_warning, &spawn);
 636                                 if (r < 0)
 637                                         return r;
 638                         }
 639
 640                         spawn.timeout = timeout_usec - age_usec;
 641
 642                         r = sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
 643                                               usec + spawn.timeout, USEC_PER_SEC, on_spawn_timeout, &spawn);
 644                         if (r < 0)
 645                                 return r;
 646                 }
 647         }
 648
 649         r = sd_event_add_child(e, NULL, pid, WEXITED, on_spawn_sigchld, &spawn);
 650         if (r < 0)
 651                 return r;
 652
 653         r = sd_event_loop(e);
 654         if (r < 0)
 655                 return r;
 656
 657         r = sd_event_get_exit_code(e, &ret);
 658         if (r < 0)
 659                 return r;
 660
 661         return ret;
 662 }
 663
 664 int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
 665         int i = 0;
 666         char *pos;
 667
 668         if (strchr(cmd, ' ') == NULL) {
 669                 argv[i++] = cmd;
 670                 goto out;
 671         }
 672
 673         pos = cmd;
 674         while (pos != NULL && pos[0] != '\0') {
 675                 if (pos[0] == '\'') {
 676                         /* do not separate quotes */
 677                         pos++;
 678                         argv[i] = strsep(&pos, "\'");
 679                         if (pos != NULL)
 680                                 while (pos[0] == ' ')
 681                                         pos++;
 682                 } else {
 683                         argv[i] = strsep(&pos, " ");
 684                         if (pos != NULL)
 685                                 while (pos[0] == ' ')
 686                                         pos++;
 687                 }
 688                 i++;
 689         }
 690 out:
 691         argv[i] = NULL;
 692         if (argc)
 693                 *argc = i;
 694         return 0;
 695 }
 696
 697 int udev_event_spawn(struct udev_event *event,
 698                      usec_t timeout_usec,
 699                      usec_t timeout_warn_usec,
 700                      const char *cmd, char **envp, const sigset_t *sigmask,
 701                      char *result, size_t ressize) {
 702         int outpipe[2] = {-1, -1};
 703         int errpipe[2] = {-1, -1};
 704         pid_t pid;
 705         char arg[UTIL_PATH_SIZE];
 706         char *argv[128];
 707         char program[UTIL_PATH_SIZE];
 708         int err = 0;
 709
 710         strscpy(arg, sizeof(arg), cmd);
 711         udev_build_argv(event->udev, arg, NULL, argv);
 712
 713         /* pipes from child to parent */
 714         if (result != NULL || log_get_max_level() >= LOG_INFO) {
 715                 if (pipe2(outpipe, O_NONBLOCK) != 0) {
 716                         err = -errno;
 717                         log_error_errno(errno, "pipe failed: %m");
 718                         goto out;
 719                 }
 720         }
 721         if (log_get_max_level() >= LOG_INFO) {
 722                 if (pipe2(errpipe, O_NONBLOCK) != 0) {
 723                         err = -errno;
 724                         log_error_errno(errno, "pipe failed: %m");
 725                         goto out;
 726                 }
 727         }
 728
 729         /* allow programs in /usr/lib/udev/ to be called without the path */
 730         if (argv[0][0] != '/') {
 731                 strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
 732                 argv[0] = program;
 733         }
 734
 735         pid = fork();
 736         switch(pid) {
 737         case 0:
 738                 /* child closes parent's ends of pipes */
 739                 if (outpipe[READ_END] >= 0) {
 740                         close(outpipe[READ_END]);
 741                         outpipe[READ_END] = -1;
 742                 }
 743                 if (errpipe[READ_END] >= 0) {
 744                         close(errpipe[READ_END]);
 745                         errpipe[READ_END] = -1;
 746                 }
 747
 748                 log_debug("starting '%s'", cmd);
 749
 750                 spawn_exec(event, cmd, argv, envp, sigmask,
 751                            outpipe[WRITE_END], errpipe[WRITE_END]);
 752
 753                 _exit(2 );
 754         case -1:
 755                 log_error_errno(errno, "fork of '%s' failed: %m", cmd);
 756                 err = -1;
 757                 goto out;
 758         default:
 759                 /* parent closed child's ends of pipes */
 760                 if (outpipe[WRITE_END] >= 0) {
 761                         close(outpipe[WRITE_END]);
 762                         outpipe[WRITE_END] = -1;
 763                 }
 764                 if (errpipe[WRITE_END] >= 0) {
 765                         close(errpipe[WRITE_END]);
 766                         errpipe[WRITE_END] = -1;
 767                 }
 768
 769                 spawn_read(event,
 770                            timeout_usec,
 771                            cmd,
 772                            outpipe[READ_END], errpipe[READ_END],
 773                            result, ressize);
 774
 775                 err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
 776         }
 777
 778 out:
 779         if (outpipe[READ_END] >= 0)
 780                 close(outpipe[READ_END]);
 781         if (outpipe[WRITE_END] >= 0)
 782                 close(outpipe[WRITE_END]);
 783         if (errpipe[READ_END] >= 0)
 784                 close(errpipe[READ_END]);
 785         if (errpipe[WRITE_END] >= 0)
 786                 close(errpipe[WRITE_END]);
 787         return err;
 788 }
 789
 790 static int rename_netif(struct udev_event *event) {
 791         struct udev_device *dev = event->dev;
 792         char name[IFNAMSIZ];
 793         const char *oldname;
 794         int r;
 795
 796         oldname = udev_device_get_sysname(dev);
 797
 798         strscpy(name, IFNAMSIZ, event->name);
 799
 800         r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
 801         if (r < 0)
 802                 return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
 803
 804         log_debug("renamed network interface '%s' to '%s'", oldname, name);
 805
 806         return 0;
 807 }
 808
 809 void udev_event_execute_rules(struct udev_event *event,
 810                               usec_t timeout_usec, usec_t timeout_warn_usec,
 811                               struct udev_list *properties_list,
 812                               struct udev_rules *rules,
 813                               const sigset_t *sigmask) {
 814         struct udev_device *dev = event->dev;
 815
 816         if (udev_device_get_subsystem(dev) == NULL)
 817                 return;
 818
 819         if (streq(udev_device_get_action(dev), "remove")) {
 820                 udev_device_read_db(dev);
 821                 udev_device_tag_index(dev, NULL, false);
 822                 udev_device_delete_db(dev);
 823
 824                 if (major(udev_device_get_devnum(dev)) != 0)
 825                         udev_watch_end(event->udev, dev);
 826
 827                 udev_rules_apply_to_event(rules, event,
 828                                           timeout_usec, timeout_warn_usec,
 829                                           properties_list,
 830                                           sigmask);
 831
 832                 if (major(udev_device_get_devnum(dev)) != 0)
 833                         udev_node_remove(dev);
 834         } else {
 835                 event->dev_db = udev_device_clone_with_db(dev);
 836                 if (event->dev_db != NULL) {
 837                         /* disable watch during event processing */
 838                         if (major(udev_device_get_devnum(dev)) != 0)
 839                                 udev_watch_end(event->udev, event->dev_db);
 840                 }
 841
 842                 if (major(udev_device_get_devnum(dev)) == 0 &&
 843                     streq(udev_device_get_action(dev), "move"))
 844                         udev_device_copy_properties(dev, event->dev_db);
 845
 846                 udev_rules_apply_to_event(rules, event,
 847                                           timeout_usec, timeout_warn_usec,
 848                                           properties_list,
 849                                           sigmask);
 850
 851                 /* rename a new network interface, if needed */
 852                 if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
 853                     event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
 854                         int r;
 855
 856                         r = rename_netif(event);
 857                         if (r < 0)
 858                                 log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
 859                                                   udev_device_get_sysname(dev), event->name);
 860                         else {
 861                                 r = udev_device_rename(dev, event->name);
 862                                 if (r < 0)
 863                                         log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
 864                                                           udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
 865                                 else
 866                                         log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
 867                         }
 868                 }
 869
 870                 if (major(udev_device_get_devnum(dev)) > 0) {
 871                         bool apply;
 872
 873                         /* remove/update possible left-over symlinks from old database entry */
 874                         if (event->dev_db != NULL)
 875                                 udev_node_update_old_links(dev, event->dev_db);
 876
 877                         if (!event->owner_set)
 878                                 event->uid = udev_device_get_devnode_uid(dev);
 879
 880                         if (!event->group_set)
 881                                 event->gid = udev_device_get_devnode_gid(dev);
 882
 883                         if (!event->mode_set) {
 884                                 if (udev_device_get_devnode_mode(dev) > 0) {
 885                                         /* kernel supplied value */
 886                                         event->mode = udev_device_get_devnode_mode(dev);
 887                                 } else if (event->gid > 0) {
 888                                         /* default 0660 if a group is assigned */
 889                                         event->mode = 0660;
 890                                 } else {
 891                                         /* default 0600 */
 892                                         event->mode = 0600;
 893                                 }
 894                         }
 895
 896                         apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
 897                         udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
 898                 }
 899
 900                 /* preserve old, or get new initialization timestamp */
 901                 udev_device_ensure_usec_initialized(event->dev, event->dev_db);
 902
 903                 /* (re)write database file */
 904                 udev_device_tag_index(dev, event->dev_db, true);
 905                 udev_device_update_db(dev);
 906                 udev_device_set_is_initialized(dev);
 907
 908                 event->dev_db = udev_device_unref(event->dev_db);
 909         }
 910 }
 911
 912 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) {
 913         struct udev_list_entry *list_entry;
 914
 915         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
 916                 const char *cmd = udev_list_entry_get_name(list_entry);
 917                 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
 918
 919                 if (builtin_cmd < UDEV_BUILTIN_MAX) {
 920                         char command[UTIL_PATH_SIZE];
 921
 922                         udev_event_apply_format(event, cmd, command, sizeof(command));
 923                         udev_builtin_run(event->dev, builtin_cmd, command, false);
 924                 } else {
 925                         char program[UTIL_PATH_SIZE];
 926                         char **envp;
 927
 928                         if (event->exec_delay > 0) {
 929                                 log_debug("delay execution of '%s'", program);
 930                                 sleep(event->exec_delay);
 931                         }
 932
 933                         udev_event_apply_format(event, cmd, program, sizeof(program));
 934                         envp = udev_device_get_properties_envp(event->dev);
 935                         udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
 936                 }
 937         }
 938 }