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->bind_to_device)
 200                 fprintf(f,
 201                         "%sBindToDevice: %s\n",
 202                         prefix, s->bind_to_device);
 203
 204         LIST_FOREACH(port, p, s->ports) {
 205
 206                 if (p->type == SOCKET_SOCKET) {
 207                         const char *t;
 208                         int r;
 209                         char *k;
 210
 211                         if ((r = socket_address_print(&p->address, &k)) < 0)
 212                                 t = strerror(-r);
 213                         else
 214                                 t = k;
 215
 216                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 217                         free(k);
 218                 } else
 219                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 220         }
 221
 222         exec_context_dump(&s->exec_context, f, prefix);
 223
 224         for (c = 0; c < _SOCKET_EXEC_MAX; c++) {
 225                 if (!s->exec_command[c])
 226                         continue;
 227
 228                 fprintf(f, "%s→ %s:\n",
 229                         prefix, command_table[c]);
 230
 231                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 232         }
 233
 234         free(p2);
 235 }
 236
 237 static void socket_close_fds(Socket *s) {
 238         SocketPort *p;
 239
 240         assert(s);
 241
 242         LIST_FOREACH(port, p, s->ports) {
 243                 if (p->fd < 0)
 244                         continue;
 245
 246                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 247                 assert_se(close_nointr(p->fd) >= 0);
 248
 249                 p->fd = -1;
 250         }
 251 }
 252
 253 static int socket_open_fds(Socket *s) {
 254         SocketPort *p;
 255         int r;
 256
 257         assert(s);
 258
 259         LIST_FOREACH(port, p, s->ports) {
 260
 261                 if (p->fd >= 0)
 262                         continue;
 263
 264                 if (p->type == SOCKET_SOCKET) {
 265
 266                         if ((r = socket_address_listen(
 267                                              &p->address,
 268                                              s->backlog,
 269                                              s->bind_ipv6_only,
 270                                              s->bind_to_device,
 271                                              s->directory_mode,
 272                                              s->socket_mode,
 273                                              &p->fd)) < 0)
 274                                 goto rollback;
 275
 276                 } else {
 277                         struct stat st;
 278                         assert(p->type == SOCKET_FIFO);
 279
 280                         mkdir_parents(p->path, s->directory_mode);
 281
 282                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 283                                 r = -errno;
 284                                 goto rollback;
 285                         }
 286
 287                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 288                                 r = -errno;
 289                                 goto rollback;
 290                         }
 291
 292                         if (fstat(p->fd, &st) < 0) {
 293                                 r = -errno;
 294                                 goto rollback;
 295                         }
 296
 297                         /* FIXME verify user, access mode */
 298
 299                         if (!S_ISFIFO(st.st_mode)) {
 300                                 r = -EEXIST;
 301                                 goto rollback;
 302                         }
 303                 }
 304         }
 305
 306         return 0;
 307
 308 rollback:
 309         socket_close_fds(s);
 310         return r;
 311 }
 312
 313 static void socket_unwatch_fds(Socket *s) {
 314         SocketPort *p;
 315
 316         assert(s);
 317
 318         LIST_FOREACH(port, p, s->ports) {
 319                 if (p->fd < 0)
 320                         continue;
 321
 322                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 323         }
 324 }
 325
 326 static int socket_watch_fds(Socket *s) {
 327         SocketPort *p;
 328         int r;
 329
 330         assert(s);
 331
 332         LIST_FOREACH(port, p, s->ports) {
 333                 if (p->fd < 0)
 334                         continue;
 335
 336                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 337                         goto fail;
 338         }
 339
 340         return 0;
 341
 342 fail:
 343         socket_unwatch_fds(s);
 344         return r;
 345 }
 346
 347 static void socket_set_state(Socket *s, SocketState state) {
 348         SocketState old_state;
 349         assert(s);
 350
 351         old_state = s->state;
 352         s->state = state;
 353
 354         if (state != SOCKET_START_PRE &&
 355             state != SOCKET_START_POST &&
 356             state != SOCKET_STOP_PRE &&
 357             state != SOCKET_STOP_PRE_SIGTERM &&
 358             state != SOCKET_STOP_PRE_SIGKILL &&
 359             state != SOCKET_STOP_POST &&
 360             state != SOCKET_STOP_POST_SIGTERM &&
 361             state != SOCKET_STOP_POST_SIGKILL)
 362                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 363
 364         if (state != SOCKET_START_PRE &&
 365             state != SOCKET_START_POST &&
 366             state != SOCKET_STOP_PRE &&
 367             state != SOCKET_STOP_PRE_SIGTERM &&
 368             state != SOCKET_STOP_PRE_SIGKILL &&
 369             state != SOCKET_STOP_POST &&
 370             state != SOCKET_STOP_POST_SIGTERM &&
 371             state != SOCKET_STOP_POST_SIGKILL)
 372                 if (s->control_pid > 0) {
 373                         unit_unwatch_pid(UNIT(s), s->control_pid);
 374                         s->control_pid = 0;
 375                 }
 376
 377         if (state != SOCKET_START_PRE &&
 378             state != SOCKET_START_POST &&
 379             state != SOCKET_STOP_PRE &&
 380             state != SOCKET_STOP_POST)
 381                 s->control_command = NULL;
 382
 383         if (state != SOCKET_START_POST &&
 384             state != SOCKET_LISTENING &&
 385             state != SOCKET_RUNNING &&
 386             state != SOCKET_STOP_PRE &&
 387             state != SOCKET_STOP_PRE_SIGTERM &&
 388             state != SOCKET_STOP_PRE_SIGKILL)
 389                 socket_close_fds(s);
 390
 391         if (state != SOCKET_LISTENING)
 392                 socket_unwatch_fds(s);
 393
 394         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 395
 396         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 397 }
 398
 399 static int socket_spawn(Socket *s, ExecCommand *c, bool timeout, pid_t *_pid) {
 400         pid_t pid;
 401         int r;
 402
 403         assert(s);
 404         assert(c);
 405         assert(_pid);
 406
 407         if (timeout) {
 408                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 409                         goto fail;
 410         } else
 411                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 412
 413         if ((r = exec_spawn(c,
 414                             &s->exec_context,
 415                             NULL, 0,
 416                             true,
 417                             true,
 418                             UNIT(s)->meta.cgroup_bondings,
 419                             &pid)) < 0)
 420                 goto fail;
 421
 422         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 423                 /* FIXME: we need to do something here */
 424                 goto fail;
 425
 426         *_pid = pid;
 427
 428         return 0;
 429
 430 fail:
 431         if (timeout)
 432                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 433
 434         return r;
 435 }
 436
 437 static void socket_enter_dead(Socket *s, bool success) {
 438         assert(s);
 439
 440         if (!success)
 441                 s->failure = true;
 442
 443         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 444 }
 445
 446 static void socket_enter_stop_post(Socket *s, bool success) {
 447         int r;
 448         assert(s);
 449
 450         if (!success)
 451                 s->failure = true;
 452
 453         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
 454                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 455                         goto fail;
 456
 457         socket_set_state(s, SOCKET_STOP_POST);
 458
 459         if (!s->control_command)
 460                 socket_enter_dead(s, true);
 461
 462         return;
 463
 464 fail:
 465         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 466         socket_enter_dead(s, false);
 467 }
 468
 469 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 470         int r;
 471
 472         assert(s);
 473
 474         if (!success)
 475                 s->failure = true;
 476
 477         if (s->control_pid > 0) {
 478                 int sig;
 479                 bool sent = false;
 480
 481                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 482
 483                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 484
 485                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 486                                 if (r != -EAGAIN && r != -ESRCH)
 487                                         goto fail;
 488                         } else
 489                                 sent = true;
 490                 }
 491
 492                 if (!sent)
 493                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 494                                 r = -errno;
 495                                 goto fail;
 496                         }
 497
 498         }
 499
 500         socket_set_state(s, state);
 501
 502         if (s->control_pid <= 0)
 503                 socket_enter_dead(s, true);
 504
 505         return;
 506
 507 fail:
 508         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 509
 510         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 511                 socket_enter_stop_post(s, false);
 512         else
 513                 socket_enter_dead(s, false);
 514 }
 515
 516 static void socket_enter_stop_pre(Socket *s, bool success) {
 517         int r;
 518         assert(s);
 519
 520         if (!success)
 521                 s->failure = true;
 522
 523         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
 524                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 525                         goto fail;
 526
 527         socket_set_state(s, SOCKET_STOP_PRE);
 528
 529         if (!s->control_command)
 530                 socket_enter_stop_post(s, true);
 531
 532         return;
 533
 534 fail:
 535         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 536         socket_enter_stop_post(s, false);
 537 }
 538
 539 static void socket_enter_listening(Socket *s) {
 540         int r;
 541         assert(s);
 542
 543         if ((r = socket_watch_fds(s)) < 0) {
 544                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 545                 goto fail;
 546         }
 547
 548         socket_set_state(s, SOCKET_LISTENING);
 549         return;
 550
 551 fail:
 552         socket_enter_stop_pre(s, false);
 553 }
 554
 555 static void socket_enter_start_post(Socket *s) {
 556         int r;
 557         assert(s);
 558
 559         if ((r = socket_open_fds(s)) < 0) {
 560                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 561                 goto fail;
 562         }
 563
 564         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
 565                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
 566                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 567                         goto fail;
 568                 }
 569
 570         socket_set_state(s, SOCKET_START_POST);
 571
 572         if (!s->control_command)
 573                 socket_enter_listening(s);
 574
 575         return;
 576
 577 fail:
 578         socket_enter_stop_pre(s, false);
 579 }
 580
 581 static void socket_enter_start_pre(Socket *s) {
 582         int r;
 583         assert(s);
 584
 585         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
 586                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 587                         goto fail;
 588
 589         socket_set_state(s, SOCKET_START_PRE);
 590
 591         if (!s->control_command)
 592                 socket_enter_start_post(s);
 593
 594         return;
 595
 596 fail:
 597         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 598         socket_enter_dead(s, false);
 599 }
 600
 601 static void socket_enter_running(Socket *s) {
 602         int r;
 603
 604         assert(s);
 605
 606         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 607                 goto fail;
 608
 609         socket_set_state(s, SOCKET_RUNNING);
 610         return;
 611
 612 fail:
 613         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 614         socket_enter_dead(s, false);
 615 }
 616
 617 static void socket_run_next(Socket *s, bool success) {
 618         int r;
 619
 620         assert(s);
 621         assert(s->control_command);
 622         assert(s->control_command->command_next);
 623
 624         if (!success)
 625                 s->failure = true;
 626
 627         s->control_command = s->control_command->command_next;
 628
 629         if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 630                 goto fail;
 631
 632         return;
 633
 634 fail:
 635         if (s->state == SOCKET_STOP_PRE)
 636                 socket_enter_stop_post(s, false);
 637         else if (s->state == SOCKET_STOP_POST)
 638                 socket_enter_dead(s, false);
 639         else
 640                 socket_enter_stop_pre(s, false);
 641 }
 642
 643 static int socket_start(Unit *u) {
 644         Socket *s = SOCKET(u);
 645
 646         assert(s);
 647
 648         /* We cannot fulfill this request right now, try again later
 649          * please! */
 650         if (s->state == SOCKET_STOP_PRE ||
 651             s->state == SOCKET_STOP_PRE_SIGKILL ||
 652             s->state == SOCKET_STOP_PRE_SIGTERM ||
 653             s->state == SOCKET_STOP_POST ||
 654             s->state == SOCKET_STOP_POST_SIGTERM ||
 655             s->state == SOCKET_STOP_POST_SIGKILL)
 656                 return -EAGAIN;
 657
 658         if (s->state == SOCKET_START_PRE ||
 659             s->state == SOCKET_START_POST)
 660                 return 0;
 661
 662         /* Cannot run this without the service being around */
 663         if (s->service->meta.load_state != UNIT_LOADED)
 664                 return -ENOENT;
 665
 666         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 667
 668         s->failure = false;
 669         socket_enter_start_pre(s);
 670         return 0;
 671 }
 672
 673 static int socket_stop(Unit *u) {
 674         Socket *s = SOCKET(u);
 675
 676         assert(s);
 677
 678         /* We cannot fulfill this request right now, try again later
 679          * please! */
 680         if (s->state == SOCKET_START_PRE ||
 681             s->state == SOCKET_START_POST)
 682                 return -EAGAIN;
 683
 684         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 685
 686         socket_enter_stop_pre(s, true);
 687         return 0;
 688 }
 689
 690 static UnitActiveState socket_active_state(Unit *u) {
 691         assert(u);
 692
 693         return state_translation_table[SOCKET(u)->state];
 694 }
 695
 696 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 697         Socket *s = SOCKET(u);
 698
 699         assert(s);
 700
 701         log_debug("Incoming traffic on %s", unit_id(u));
 702
 703         if (events != EPOLLIN)
 704                 socket_enter_stop_pre(s, false);
 705
 706         socket_enter_running(s);
 707 }
 708
 709 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 710         Socket *s = SOCKET(u);
 711         bool success;
 712
 713         assert(s);
 714         assert(pid >= 0);
 715
 716         success = code == CLD_EXITED && status == 0;
 717         s->failure = s->failure || !success;
 718
 719         assert(s->control_pid == pid);
 720         assert(s->control_command);
 721
 722         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 723         s->control_pid = 0;
 724
 725         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 726
 727         if (s->control_command->command_next &&
 728             (success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
 729                 log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
 730                 socket_run_next(s, success);
 731         } else {
 732                 /* No further commands for this step, so let's figure
 733                  * out what to do next */
 734
 735                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 736
 737                 switch (s->state) {
 738
 739                 case SOCKET_START_PRE:
 740                         if (success)
 741                                 socket_enter_start_post(s);
 742                         else
 743                                 socket_enter_stop_pre(s, false);
 744                         break;
 745
 746                 case SOCKET_START_POST:
 747                         if (success)
 748                                 socket_enter_listening(s);
 749                         else
 750                                 socket_enter_stop_pre(s, false);
 751                         break;
 752
 753                 case SOCKET_STOP_PRE:
 754                 case SOCKET_STOP_PRE_SIGTERM:
 755                 case SOCKET_STOP_PRE_SIGKILL:
 756                         socket_enter_stop_post(s, success);
 757                         break;
 758
 759                 case SOCKET_STOP_POST:
 760                 case SOCKET_STOP_POST_SIGTERM:
 761                 case SOCKET_STOP_POST_SIGKILL:
 762                         socket_enter_dead(s, success);
 763                         break;
 764
 765                 default:
 766                         assert_not_reached("Uh, control process died at wrong time.");
 767                 }
 768         }
 769 }
 770
 771 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 772         Socket *s = SOCKET(u);
 773
 774         assert(s);
 775         assert(elapsed == 1);
 776
 777         assert(w == &s->timer_watch);
 778
 779         switch (s->state) {
 780
 781         case SOCKET_START_PRE:
 782         case SOCKET_START_POST:
 783                 log_warning("%s operation timed out. Stopping.", unit_id(u));
 784                 socket_enter_stop_pre(s, false);
 785                 break;
 786
 787         case SOCKET_STOP_PRE:
 788                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 789                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 790                 break;
 791
 792         case SOCKET_STOP_PRE_SIGTERM:
 793                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 794                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 795                 break;
 796
 797         case SOCKET_STOP_PRE_SIGKILL:
 798                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 799                 socket_enter_stop_post(s, false);
 800                 break;
 801
 802         case SOCKET_STOP_POST:
 803                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 804                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 805                 break;
 806
 807         case SOCKET_STOP_POST_SIGTERM:
 808                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 809                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 810                 break;
 811
 812         case SOCKET_STOP_POST_SIGKILL:
 813                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 814                 socket_enter_dead(s, false);
 815                 break;
 816
 817         default:
 818                 assert_not_reached("Timeout at wrong time.");
 819         }
 820 }
 821
 822 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 823         int *rfds;
 824         unsigned rn_fds, k;
 825         SocketPort *p;
 826
 827         assert(s);
 828         assert(fds);
 829         assert(n_fds);
 830
 831         /* Called from the service code for requesting our fds */
 832
 833         rn_fds = 0;
 834         LIST_FOREACH(port, p, s->ports)
 835                 if (p->fd >= 0)
 836                         rn_fds++;
 837
 838         if (!(rfds = new(int, rn_fds)) < 0)
 839                 return -ENOMEM;
 840
 841         k = 0;
 842         LIST_FOREACH(port, p, s->ports)
 843                 if (p->fd >= 0)
 844                         rfds[k++] = p->fd;
 845
 846         assert(k == rn_fds);
 847
 848         *fds = rfds;
 849         *n_fds = rn_fds;
 850
 851         return 0;
 852 }
 853
 854 void socket_notify_service_dead(Socket *s) {
 855         assert(s);
 856
 857         /* The service is dead. Dang. */
 858
 859         if (s->state == SOCKET_RUNNING) {
 860                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 861                 socket_enter_listening(s);
 862         }
 863 }
 864
 865 const UnitVTable socket_vtable = {
 866         .suffix = ".socket",
 867
 868         .init = socket_init,
 869         .done = socket_done,
 870
 871         .dump = socket_dump,
 872
 873         .start = socket_start,
 874         .stop = socket_stop,
 875
 876         .active_state = socket_active_state,
 877
 878         .fd_event = socket_fd_event,
 879         .sigchld_event = socket_sigchld_event,
 880         .timer_event = socket_timer_event
 881 };