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