socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29
  30 #include "unit.h"
  31 #include "socket.h"
  32 #include "log.h"
  33 #include "load-dropin.h"
  34 #include "load-fragment.h"
  35
  36 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  37         [SOCKET_DEAD] = UNIT_INACTIVE,
  38         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  39         [SOCKET_START_POST] = UNIT_ACTIVATING,
  40         [SOCKET_LISTENING] = UNIT_ACTIVE,
  41         [SOCKET_RUNNING] = UNIT_ACTIVE,
  42         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  43         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  44         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  45         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  46         [SOCKET_STOP_POST_SIGTERM] = UNIT_DEACTIVATING,
  47         [SOCKET_STOP_POST_SIGKILL] = UNIT_DEACTIVATING,
  48         [SOCKET_MAINTAINANCE] = UNIT_INACTIVE,
  49 };
  50
  51 static const char* const state_string_table[_SOCKET_STATE_MAX] = {
  52         [SOCKET_DEAD] = "dead",
  53         [SOCKET_START_PRE] = "start-pre",
  54         [SOCKET_START_POST] = "start-post",
  55         [SOCKET_LISTENING] = "listening",
  56         [SOCKET_RUNNING] = "running",
  57         [SOCKET_STOP_PRE] = "stop-pre",
  58         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
  59         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
  60         [SOCKET_STOP_POST] = "stop-post",
  61         [SOCKET_STOP_POST_SIGTERM] = "stop-post-sigterm",
  62         [SOCKET_STOP_POST_SIGKILL] = "stop-post-sigkill",
  63         [SOCKET_MAINTAINANCE] = "maintainance"
  64 };
  65
  66 static void socket_done(Unit *u) {
  67         Socket *s = SOCKET(u);
  68         SocketPort *p;
  69
  70         assert(s);
  71
  72         while ((p = s->ports)) {
  73                 LIST_REMOVE(SocketPort, port, s->ports, p);
  74
  75                 if (p->fd >= 0)
  76                         close_nointr(p->fd);
  77                 free(p->path);
  78                 free(p);
  79         }
  80
  81         exec_context_done(&s->exec_context);
  82         exec_command_free_array(s->exec_command, _SOCKET_EXEC_MAX);
  83         s->control_command = NULL;
  84
  85         if (s->control_pid > 0) {
  86                 unit_unwatch_pid(u, s->control_pid);
  87                 s->control_pid = 0;
  88         }
  89
  90         s->service = NULL;
  91
  92         free(s->bind_to_device);
  93
  94         unit_unwatch_timer(u, &s->timer_watch);
  95 }
  96
  97 static int socket_init(Unit *u, UnitLoadState *new_state) {
  98         Socket *s = SOCKET(u);
  99         char *t;
 100         int r;
 101
 102         /* First, reset everything to the defaults, in case this is a
 103          * reload */
 104
 105         s->state = 0;
 106         s->timer_watch.type = WATCH_INVALID;
 107         s->bind_ipv6_only = false;
 108         s->backlog = SOMAXCONN;
 109         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
 110         s->directory_mode = 0755;
 111         s->socket_mode = 0666;
 112         s->kill_mode = 0;
 113         s->failure = false;
 114         s->control_pid = 0;
 115         exec_context_init(&s->exec_context);
 116
 117         if ((r = unit_load_fragment(u, new_state)) < 0)
 118                 return r;
 119
 120         if (*new_state == UNIT_STUB)
 121                 return -ENOENT;
 122
 123         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 124                 return r;
 125
 126         /* This is a new unit? Then let's add in some extras */
 127         if (*new_state == UNIT_LOADED) {
 128
 129                 if (!(t = unit_name_change_suffix(unit_id(u), ".service")))
 130                         return -ENOMEM;
 131
 132                 r = manager_load_unit(u->meta.manager, t, (Unit**) &s->service);
 133                 free(t);
 134
 135                 if (r < 0)
 136                         return r;
 137
 138                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service))) < 0)
 139                         return r;
 140
 141                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 142                         return r;
 143
 144                 if ((r = unit_add_default_cgroup(u)) < 0)
 145                         return r;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static const char* listen_lookup(int type) {
 152
 153         if (type == SOCK_STREAM)
 154                 return "ListenStream";
 155         else if (type == SOCK_DGRAM)
 156                 return "ListenDatagram";
 157         else if (type == SOCK_SEQPACKET)
 158                 return "ListenSequentialPacket";
 159
 160         assert_not_reached("Unknown socket type");
 161         return NULL;
 162 }
 163
 164 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 165
 166         static const char* const command_table[_SOCKET_EXEC_MAX] = {
 167                 [SOCKET_EXEC_START_PRE] = "StartPre",
 168                 [SOCKET_EXEC_START_POST] = "StartPost",
 169                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
 170                 [SOCKET_EXEC_STOP_POST] = "StopPost"
 171         };
 172
 173         SocketExecCommand c;
 174         Socket *s = SOCKET(u);
 175         SocketPort *p;
 176         const char *prefix2;
 177         char *p2;
 178
 179         assert(s);
 180         assert(f);
 181
 182         p2 = strappend(prefix, "\t");
 183         prefix2 = p2 ? p2 : prefix;
 184
 185         fprintf(f,
 186                 "%sSocket State: %s\n"
 187                 "%sBindIPv6Only: %s\n"
 188                 "%sBacklog: %u\n"
 189                 "%sKillMode: %s\n"
 190                 "%sSocketMode: %04o\n"
 191                 "%sDirectoryMode: %04o\n",
 192                 prefix, state_string_table[s->state],
 193                 prefix, yes_no(s->bind_ipv6_only),
 194                 prefix, s->backlog,
 195                 prefix, kill_mode_to_string(s->kill_mode),
 196                 prefix, s->socket_mode,
 197                 prefix, s->directory_mode);
 198
 199         if (s->control_pid > 0)
 200                 fprintf(f,
 201                         "%sControl PID: %llu\n",
 202                         prefix, (unsigned long long) s->control_pid);
 203
 204         if (s->bind_to_device)
 205                 fprintf(f,
 206                         "%sBindToDevice: %s\n",
 207                         prefix, s->bind_to_device);
 208
 209         LIST_FOREACH(port, p, s->ports) {
 210
 211                 if (p->type == SOCKET_SOCKET) {
 212                         const char *t;
 213                         int r;
 214                         char *k;
 215
 216                         if ((r = socket_address_print(&p->address, &k)) < 0)
 217                                 t = strerror(-r);
 218                         else
 219                                 t = k;
 220
 221                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 222                         free(k);
 223                 } else
 224                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 225         }
 226
 227         exec_context_dump(&s->exec_context, f, prefix);
 228
 229         for (c = 0; c < _SOCKET_EXEC_MAX; c++) {
 230                 if (!s->exec_command[c])
 231                         continue;
 232
 233                 fprintf(f, "%s→ %s:\n",
 234                         prefix, command_table[c]);
 235
 236                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 237         }
 238
 239         free(p2);
 240 }
 241
 242 static void socket_close_fds(Socket *s) {
 243         SocketPort *p;
 244
 245         assert(s);
 246
 247         LIST_FOREACH(port, p, s->ports) {
 248                 if (p->fd < 0)
 249                         continue;
 250
 251                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 252                 assert_se(close_nointr(p->fd) >= 0);
 253
 254                 p->fd = -1;
 255         }
 256 }
 257
 258 static int socket_open_fds(Socket *s) {
 259         SocketPort *p;
 260         int r;
 261
 262         assert(s);
 263
 264         LIST_FOREACH(port, p, s->ports) {
 265
 266                 if (p->fd >= 0)
 267                         continue;
 268
 269                 if (p->type == SOCKET_SOCKET) {
 270
 271                         if ((r = socket_address_listen(
 272                                              &p->address,
 273                                              s->backlog,
 274                                              s->bind_ipv6_only,
 275                                              s->bind_to_device,
 276                                              s->directory_mode,
 277                                              s->socket_mode,
 278                                              &p->fd)) < 0)
 279                                 goto rollback;
 280
 281                 } else {
 282                         struct stat st;
 283                         assert(p->type == SOCKET_FIFO);
 284
 285                         mkdir_parents(p->path, s->directory_mode);
 286
 287                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 288                                 r = -errno;
 289                                 goto rollback;
 290                         }
 291
 292                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 293                                 r = -errno;
 294                                 goto rollback;
 295                         }
 296
 297                         if (fstat(p->fd, &st) < 0) {
 298                                 r = -errno;
 299                                 goto rollback;
 300                         }
 301
 302                         /* FIXME verify user, access mode */
 303
 304                         if (!S_ISFIFO(st.st_mode)) {
 305                                 r = -EEXIST;
 306                                 goto rollback;
 307                         }
 308                 }
 309         }
 310
 311         return 0;
 312
 313 rollback:
 314         socket_close_fds(s);
 315         return r;
 316 }
 317
 318 static void socket_unwatch_fds(Socket *s) {
 319         SocketPort *p;
 320
 321         assert(s);
 322
 323         LIST_FOREACH(port, p, s->ports) {
 324                 if (p->fd < 0)
 325                         continue;
 326
 327                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 328         }
 329 }
 330
 331 static int socket_watch_fds(Socket *s) {
 332         SocketPort *p;
 333         int r;
 334
 335         assert(s);
 336
 337         LIST_FOREACH(port, p, s->ports) {
 338                 if (p->fd < 0)
 339                         continue;
 340
 341                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 342                         goto fail;
 343         }
 344
 345         return 0;
 346
 347 fail:
 348         socket_unwatch_fds(s);
 349         return r;
 350 }
 351
 352 static void socket_set_state(Socket *s, SocketState state) {
 353         SocketState old_state;
 354         assert(s);
 355
 356         old_state = s->state;
 357         s->state = state;
 358
 359         if (state != SOCKET_START_PRE &&
 360             state != SOCKET_START_POST &&
 361             state != SOCKET_STOP_PRE &&
 362             state != SOCKET_STOP_PRE_SIGTERM &&
 363             state != SOCKET_STOP_PRE_SIGKILL &&
 364             state != SOCKET_STOP_POST &&
 365             state != SOCKET_STOP_POST_SIGTERM &&
 366             state != SOCKET_STOP_POST_SIGKILL)
 367                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 368
 369         if (state != SOCKET_START_PRE &&
 370             state != SOCKET_START_POST &&
 371             state != SOCKET_STOP_PRE &&
 372             state != SOCKET_STOP_PRE_SIGTERM &&
 373             state != SOCKET_STOP_PRE_SIGKILL &&
 374             state != SOCKET_STOP_POST &&
 375             state != SOCKET_STOP_POST_SIGTERM &&
 376             state != SOCKET_STOP_POST_SIGKILL)
 377                 if (s->control_pid > 0) {
 378                         unit_unwatch_pid(UNIT(s), s->control_pid);
 379                         s->control_pid = 0;
 380                 }
 381
 382         if (state != SOCKET_START_PRE &&
 383             state != SOCKET_START_POST &&
 384             state != SOCKET_STOP_PRE &&
 385             state != SOCKET_STOP_POST)
 386                 s->control_command = NULL;
 387
 388         if (state != SOCKET_START_POST &&
 389             state != SOCKET_LISTENING &&
 390             state != SOCKET_RUNNING &&
 391             state != SOCKET_STOP_PRE &&
 392             state != SOCKET_STOP_PRE_SIGTERM &&
 393             state != SOCKET_STOP_PRE_SIGKILL)
 394                 socket_close_fds(s);
 395
 396         if (state != SOCKET_LISTENING)
 397                 socket_unwatch_fds(s);
 398
 399         if (state == old_state)
 400                 return;
 401
 402         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 403
 404         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 405 }
 406
 407 static int socket_spawn(Socket *s, ExecCommand *c, bool timeout, pid_t *_pid) {
 408         pid_t pid;
 409         int r;
 410
 411         assert(s);
 412         assert(c);
 413         assert(_pid);
 414
 415         if (timeout) {
 416                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 417                         goto fail;
 418         } else
 419                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 420
 421         if ((r = exec_spawn(c,
 422                             &s->exec_context,
 423                             NULL, 0,
 424                             true,
 425                             true,
 426                             UNIT(s)->meta.cgroup_bondings,
 427                             &pid)) < 0)
 428                 goto fail;
 429
 430         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 431                 /* FIXME: we need to do something here */
 432                 goto fail;
 433
 434         *_pid = pid;
 435
 436         return 0;
 437
 438 fail:
 439         if (timeout)
 440                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 441
 442         return r;
 443 }
 444
 445 static void socket_enter_dead(Socket *s, bool success) {
 446         assert(s);
 447
 448         if (!success)
 449                 s->failure = true;
 450
 451         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 452 }
 453
 454 static void socket_enter_stop_post(Socket *s, bool success) {
 455         int r;
 456         assert(s);
 457
 458         if (!success)
 459                 s->failure = true;
 460
 461         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
 462                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 463                         goto fail;
 464
 465         socket_set_state(s, SOCKET_STOP_POST);
 466
 467         if (!s->control_command)
 468                 socket_enter_dead(s, true);
 469
 470         return;
 471
 472 fail:
 473         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 474         socket_enter_dead(s, false);
 475 }
 476
 477 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 478         int r;
 479
 480         assert(s);
 481
 482         if (!success)
 483                 s->failure = true;
 484
 485         if (s->control_pid > 0) {
 486                 int sig;
 487                 bool sent = false;
 488
 489                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 490
 491                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 492
 493                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 494                                 if (r != -EAGAIN && r != -ESRCH)
 495                                         goto fail;
 496                         } else
 497                                 sent = true;
 498                 }
 499
 500                 if (!sent)
 501                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 502                                 r = -errno;
 503                                 goto fail;
 504                         }
 505
 506         }
 507
 508         socket_set_state(s, state);
 509
 510         if (s->control_pid <= 0)
 511                 socket_enter_dead(s, true);
 512
 513         return;
 514
 515 fail:
 516         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 517
 518         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 519                 socket_enter_stop_post(s, false);
 520         else
 521                 socket_enter_dead(s, false);
 522 }
 523
 524 static void socket_enter_stop_pre(Socket *s, bool success) {
 525         int r;
 526         assert(s);
 527
 528         if (!success)
 529                 s->failure = true;
 530
 531         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
 532                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 533                         goto fail;
 534
 535         socket_set_state(s, SOCKET_STOP_PRE);
 536
 537         if (!s->control_command)
 538                 socket_enter_stop_post(s, true);
 539
 540         return;
 541
 542 fail:
 543         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 544         socket_enter_stop_post(s, false);
 545 }
 546
 547 static void socket_enter_listening(Socket *s) {
 548         int r;
 549         assert(s);
 550
 551         if ((r = socket_watch_fds(s)) < 0) {
 552                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 553                 goto fail;
 554         }
 555
 556         socket_set_state(s, SOCKET_LISTENING);
 557         return;
 558
 559 fail:
 560         socket_enter_stop_pre(s, false);
 561 }
 562
 563 static void socket_enter_start_post(Socket *s) {
 564         int r;
 565         assert(s);
 566
 567         if ((r = socket_open_fds(s)) < 0) {
 568                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 569                 goto fail;
 570         }
 571
 572         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
 573                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
 574                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 575                         goto fail;
 576                 }
 577
 578         socket_set_state(s, SOCKET_START_POST);
 579
 580         if (!s->control_command)
 581                 socket_enter_listening(s);
 582
 583         return;
 584
 585 fail:
 586         socket_enter_stop_pre(s, false);
 587 }
 588
 589 static void socket_enter_start_pre(Socket *s) {
 590         int r;
 591         assert(s);
 592
 593         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
 594                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 595                         goto fail;
 596
 597         socket_set_state(s, SOCKET_START_PRE);
 598
 599         if (!s->control_command)
 600                 socket_enter_start_post(s);
 601
 602         return;
 603
 604 fail:
 605         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 606         socket_enter_dead(s, false);
 607 }
 608
 609 static void socket_enter_running(Socket *s) {
 610         int r;
 611
 612         assert(s);
 613
 614         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 615                 goto fail;
 616
 617         socket_set_state(s, SOCKET_RUNNING);
 618         return;
 619
 620 fail:
 621         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 622         socket_enter_dead(s, false);
 623 }
 624
 625 static void socket_run_next(Socket *s, bool success) {
 626         int r;
 627
 628         assert(s);
 629         assert(s->control_command);
 630         assert(s->control_command->command_next);
 631
 632         if (!success)
 633                 s->failure = true;
 634
 635         s->control_command = s->control_command->command_next;
 636
 637         if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 638                 goto fail;
 639
 640         return;
 641
 642 fail:
 643         if (s->state == SOCKET_STOP_PRE)
 644                 socket_enter_stop_post(s, false);
 645         else if (s->state == SOCKET_STOP_POST)
 646                 socket_enter_dead(s, false);
 647         else
 648                 socket_enter_stop_pre(s, false);
 649 }
 650
 651 static int socket_start(Unit *u) {
 652         Socket *s = SOCKET(u);
 653
 654         assert(s);
 655
 656         /* We cannot fulfill this request right now, try again later
 657          * please! */
 658         if (s->state == SOCKET_STOP_PRE ||
 659             s->state == SOCKET_STOP_PRE_SIGKILL ||
 660             s->state == SOCKET_STOP_PRE_SIGTERM ||
 661             s->state == SOCKET_STOP_POST ||
 662             s->state == SOCKET_STOP_POST_SIGTERM ||
 663             s->state == SOCKET_STOP_POST_SIGKILL)
 664                 return -EAGAIN;
 665
 666         if (s->state == SOCKET_START_PRE ||
 667             s->state == SOCKET_START_POST)
 668                 return 0;
 669
 670         /* Cannot run this without the service being around */
 671         if (s->service->meta.load_state != UNIT_LOADED)
 672                 return -ENOENT;
 673
 674         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 675
 676         s->failure = false;
 677         socket_enter_start_pre(s);
 678         return 0;
 679 }
 680
 681 static int socket_stop(Unit *u) {
 682         Socket *s = SOCKET(u);
 683
 684         assert(s);
 685
 686         /* We cannot fulfill this request right now, try again later
 687          * please! */
 688         if (s->state == SOCKET_START_PRE ||
 689             s->state == SOCKET_START_POST)
 690                 return -EAGAIN;
 691
 692         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 693
 694         socket_enter_stop_pre(s, true);
 695         return 0;
 696 }
 697
 698 static UnitActiveState socket_active_state(Unit *u) {
 699         assert(u);
 700
 701         return state_translation_table[SOCKET(u)->state];
 702 }
 703
 704 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 705         Socket *s = SOCKET(u);
 706
 707         assert(s);
 708
 709         log_debug("Incoming traffic on %s", unit_id(u));
 710
 711         if (events != EPOLLIN)
 712                 socket_enter_stop_pre(s, false);
 713
 714         socket_enter_running(s);
 715 }
 716
 717 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 718         Socket *s = SOCKET(u);
 719         bool success;
 720
 721         assert(s);
 722         assert(pid >= 0);
 723
 724         success = code == CLD_EXITED && status == 0;
 725         s->failure = s->failure || !success;
 726
 727         assert(s->control_pid == pid);
 728         assert(s->control_command);
 729
 730         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 731         s->control_pid = 0;
 732
 733         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 734
 735         if (s->control_command->command_next &&
 736             (success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
 737                 log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
 738                 socket_run_next(s, success);
 739         } else {
 740                 /* No further commands for this step, so let's figure
 741                  * out what to do next */
 742
 743                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 744
 745                 switch (s->state) {
 746
 747                 case SOCKET_START_PRE:
 748                         if (success)
 749                                 socket_enter_start_post(s);
 750                         else
 751                                 socket_enter_stop_pre(s, false);
 752                         break;
 753
 754                 case SOCKET_START_POST:
 755                         if (success)
 756                                 socket_enter_listening(s);
 757                         else
 758                                 socket_enter_stop_pre(s, false);
 759                         break;
 760
 761                 case SOCKET_STOP_PRE:
 762                 case SOCKET_STOP_PRE_SIGTERM:
 763                 case SOCKET_STOP_PRE_SIGKILL:
 764                         socket_enter_stop_post(s, success);
 765                         break;
 766
 767                 case SOCKET_STOP_POST:
 768                 case SOCKET_STOP_POST_SIGTERM:
 769                 case SOCKET_STOP_POST_SIGKILL:
 770                         socket_enter_dead(s, success);
 771                         break;
 772
 773                 default:
 774                         assert_not_reached("Uh, control process died at wrong time.");
 775                 }
 776         }
 777 }
 778
 779 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 780         Socket *s = SOCKET(u);
 781
 782         assert(s);
 783         assert(elapsed == 1);
 784
 785         assert(w == &s->timer_watch);
 786
 787         switch (s->state) {
 788
 789         case SOCKET_START_PRE:
 790         case SOCKET_START_POST:
 791                 log_warning("%s operation timed out. Stopping.", unit_id(u));
 792                 socket_enter_stop_pre(s, false);
 793                 break;
 794
 795         case SOCKET_STOP_PRE:
 796                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 797                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 798                 break;
 799
 800         case SOCKET_STOP_PRE_SIGTERM:
 801                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 802                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 803                 break;
 804
 805         case SOCKET_STOP_PRE_SIGKILL:
 806                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 807                 socket_enter_stop_post(s, false);
 808                 break;
 809
 810         case SOCKET_STOP_POST:
 811                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 812                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 813                 break;
 814
 815         case SOCKET_STOP_POST_SIGTERM:
 816                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 817                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 818                 break;
 819
 820         case SOCKET_STOP_POST_SIGKILL:
 821                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 822                 socket_enter_dead(s, false);
 823                 break;
 824
 825         default:
 826                 assert_not_reached("Timeout at wrong time.");
 827         }
 828 }
 829
 830 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 831         int *rfds;
 832         unsigned rn_fds, k;
 833         SocketPort *p;
 834
 835         assert(s);
 836         assert(fds);
 837         assert(n_fds);
 838
 839         /* Called from the service code for requesting our fds */
 840
 841         rn_fds = 0;
 842         LIST_FOREACH(port, p, s->ports)
 843                 if (p->fd >= 0)
 844                         rn_fds++;
 845
 846         if (!(rfds = new(int, rn_fds)) < 0)
 847                 return -ENOMEM;
 848
 849         k = 0;
 850         LIST_FOREACH(port, p, s->ports)
 851                 if (p->fd >= 0)
 852                         rfds[k++] = p->fd;
 853
 854         assert(k == rn_fds);
 855
 856         *fds = rfds;
 857         *n_fds = rn_fds;
 858
 859         return 0;
 860 }
 861
 862 void socket_notify_service_dead(Socket *s) {
 863         assert(s);
 864
 865         /* The service is dead. Dang. */
 866
 867         if (s->state == SOCKET_RUNNING) {
 868                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 869                 socket_enter_listening(s);
 870         }
 871 }
 872
 873 const UnitVTable socket_vtable = {
 874         .suffix = ".socket",
 875
 876         .init = socket_init,
 877         .done = socket_done,
 878
 879         .dump = socket_dump,
 880
 881         .start = socket_start,
 882         .stop = socket_stop,
 883
 884         .active_state = socket_active_state,
 885
 886         .fd_event = socket_fd_event,
 887         .sigchld_event = socket_sigchld_event,
 888         .timer_event = socket_timer_event
 889 };