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         if (state == old_state)
 395                 return;
 396
 397         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 398
 399         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 400 }
 401
 402 static int socket_spawn(Socket *s, ExecCommand *c, bool timeout, pid_t *_pid) {
 403         pid_t pid;
 404         int r;
 405
 406         assert(s);
 407         assert(c);
 408         assert(_pid);
 409
 410         if (timeout) {
 411                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 412                         goto fail;
 413         } else
 414                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 415
 416         if ((r = exec_spawn(c,
 417                             &s->exec_context,
 418                             NULL, 0,
 419                             true,
 420                             true,
 421                             UNIT(s)->meta.cgroup_bondings,
 422                             &pid)) < 0)
 423                 goto fail;
 424
 425         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 426                 /* FIXME: we need to do something here */
 427                 goto fail;
 428
 429         *_pid = pid;
 430
 431         return 0;
 432
 433 fail:
 434         if (timeout)
 435                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 436
 437         return r;
 438 }
 439
 440 static void socket_enter_dead(Socket *s, bool success) {
 441         assert(s);
 442
 443         if (!success)
 444                 s->failure = true;
 445
 446         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 447 }
 448
 449 static void socket_enter_stop_post(Socket *s, bool success) {
 450         int r;
 451         assert(s);
 452
 453         if (!success)
 454                 s->failure = true;
 455
 456         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
 457                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 458                         goto fail;
 459
 460         socket_set_state(s, SOCKET_STOP_POST);
 461
 462         if (!s->control_command)
 463                 socket_enter_dead(s, true);
 464
 465         return;
 466
 467 fail:
 468         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 469         socket_enter_dead(s, false);
 470 }
 471
 472 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 473         int r;
 474
 475         assert(s);
 476
 477         if (!success)
 478                 s->failure = true;
 479
 480         if (s->control_pid > 0) {
 481                 int sig;
 482                 bool sent = false;
 483
 484                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 485
 486                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 487
 488                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 489                                 if (r != -EAGAIN && r != -ESRCH)
 490                                         goto fail;
 491                         } else
 492                                 sent = true;
 493                 }
 494
 495                 if (!sent)
 496                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 497                                 r = -errno;
 498                                 goto fail;
 499                         }
 500
 501         }
 502
 503         socket_set_state(s, state);
 504
 505         if (s->control_pid <= 0)
 506                 socket_enter_dead(s, true);
 507
 508         return;
 509
 510 fail:
 511         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 512
 513         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 514                 socket_enter_stop_post(s, false);
 515         else
 516                 socket_enter_dead(s, false);
 517 }
 518
 519 static void socket_enter_stop_pre(Socket *s, bool success) {
 520         int r;
 521         assert(s);
 522
 523         if (!success)
 524                 s->failure = true;
 525
 526         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
 527                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 528                         goto fail;
 529
 530         socket_set_state(s, SOCKET_STOP_PRE);
 531
 532         if (!s->control_command)
 533                 socket_enter_stop_post(s, true);
 534
 535         return;
 536
 537 fail:
 538         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 539         socket_enter_stop_post(s, false);
 540 }
 541
 542 static void socket_enter_listening(Socket *s) {
 543         int r;
 544         assert(s);
 545
 546         if ((r = socket_watch_fds(s)) < 0) {
 547                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 548                 goto fail;
 549         }
 550
 551         socket_set_state(s, SOCKET_LISTENING);
 552         return;
 553
 554 fail:
 555         socket_enter_stop_pre(s, false);
 556 }
 557
 558 static void socket_enter_start_post(Socket *s) {
 559         int r;
 560         assert(s);
 561
 562         if ((r = socket_open_fds(s)) < 0) {
 563                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 564                 goto fail;
 565         }
 566
 567         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
 568                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
 569                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 570                         goto fail;
 571                 }
 572
 573         socket_set_state(s, SOCKET_START_POST);
 574
 575         if (!s->control_command)
 576                 socket_enter_listening(s);
 577
 578         return;
 579
 580 fail:
 581         socket_enter_stop_pre(s, false);
 582 }
 583
 584 static void socket_enter_start_pre(Socket *s) {
 585         int r;
 586         assert(s);
 587
 588         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
 589                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 590                         goto fail;
 591
 592         socket_set_state(s, SOCKET_START_PRE);
 593
 594         if (!s->control_command)
 595                 socket_enter_start_post(s);
 596
 597         return;
 598
 599 fail:
 600         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 601         socket_enter_dead(s, false);
 602 }
 603
 604 static void socket_enter_running(Socket *s) {
 605         int r;
 606
 607         assert(s);
 608
 609         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 610                 goto fail;
 611
 612         socket_set_state(s, SOCKET_RUNNING);
 613         return;
 614
 615 fail:
 616         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 617         socket_enter_dead(s, false);
 618 }
 619
 620 static void socket_run_next(Socket *s, bool success) {
 621         int r;
 622
 623         assert(s);
 624         assert(s->control_command);
 625         assert(s->control_command->command_next);
 626
 627         if (!success)
 628                 s->failure = true;
 629
 630         s->control_command = s->control_command->command_next;
 631
 632         if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 633                 goto fail;
 634
 635         return;
 636
 637 fail:
 638         if (s->state == SOCKET_STOP_PRE)
 639                 socket_enter_stop_post(s, false);
 640         else if (s->state == SOCKET_STOP_POST)
 641                 socket_enter_dead(s, false);
 642         else
 643                 socket_enter_stop_pre(s, false);
 644 }
 645
 646 static int socket_start(Unit *u) {
 647         Socket *s = SOCKET(u);
 648
 649         assert(s);
 650
 651         /* We cannot fulfill this request right now, try again later
 652          * please! */
 653         if (s->state == SOCKET_STOP_PRE ||
 654             s->state == SOCKET_STOP_PRE_SIGKILL ||
 655             s->state == SOCKET_STOP_PRE_SIGTERM ||
 656             s->state == SOCKET_STOP_POST ||
 657             s->state == SOCKET_STOP_POST_SIGTERM ||
 658             s->state == SOCKET_STOP_POST_SIGKILL)
 659                 return -EAGAIN;
 660
 661         if (s->state == SOCKET_START_PRE ||
 662             s->state == SOCKET_START_POST)
 663                 return 0;
 664
 665         /* Cannot run this without the service being around */
 666         if (s->service->meta.load_state != UNIT_LOADED)
 667                 return -ENOENT;
 668
 669         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 670
 671         s->failure = false;
 672         socket_enter_start_pre(s);
 673         return 0;
 674 }
 675
 676 static int socket_stop(Unit *u) {
 677         Socket *s = SOCKET(u);
 678
 679         assert(s);
 680
 681         /* We cannot fulfill this request right now, try again later
 682          * please! */
 683         if (s->state == SOCKET_START_PRE ||
 684             s->state == SOCKET_START_POST)
 685                 return -EAGAIN;
 686
 687         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 688
 689         socket_enter_stop_pre(s, true);
 690         return 0;
 691 }
 692
 693 static UnitActiveState socket_active_state(Unit *u) {
 694         assert(u);
 695
 696         return state_translation_table[SOCKET(u)->state];
 697 }
 698
 699 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 700         Socket *s = SOCKET(u);
 701
 702         assert(s);
 703
 704         log_debug("Incoming traffic on %s", unit_id(u));
 705
 706         if (events != EPOLLIN)
 707                 socket_enter_stop_pre(s, false);
 708
 709         socket_enter_running(s);
 710 }
 711
 712 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 713         Socket *s = SOCKET(u);
 714         bool success;
 715
 716         assert(s);
 717         assert(pid >= 0);
 718
 719         success = code == CLD_EXITED && status == 0;
 720         s->failure = s->failure || !success;
 721
 722         assert(s->control_pid == pid);
 723         assert(s->control_command);
 724
 725         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 726         s->control_pid = 0;
 727
 728         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 729
 730         if (s->control_command->command_next &&
 731             (success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
 732                 log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
 733                 socket_run_next(s, success);
 734         } else {
 735                 /* No further commands for this step, so let's figure
 736                  * out what to do next */
 737
 738                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 739
 740                 switch (s->state) {
 741
 742                 case SOCKET_START_PRE:
 743                         if (success)
 744                                 socket_enter_start_post(s);
 745                         else
 746                                 socket_enter_stop_pre(s, false);
 747                         break;
 748
 749                 case SOCKET_START_POST:
 750                         if (success)
 751                                 socket_enter_listening(s);
 752                         else
 753                                 socket_enter_stop_pre(s, false);
 754                         break;
 755
 756                 case SOCKET_STOP_PRE:
 757                 case SOCKET_STOP_PRE_SIGTERM:
 758                 case SOCKET_STOP_PRE_SIGKILL:
 759                         socket_enter_stop_post(s, success);
 760                         break;
 761
 762                 case SOCKET_STOP_POST:
 763                 case SOCKET_STOP_POST_SIGTERM:
 764                 case SOCKET_STOP_POST_SIGKILL:
 765                         socket_enter_dead(s, success);
 766                         break;
 767
 768                 default:
 769                         assert_not_reached("Uh, control process died at wrong time.");
 770                 }
 771         }
 772 }
 773
 774 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 775         Socket *s = SOCKET(u);
 776
 777         assert(s);
 778         assert(elapsed == 1);
 779
 780         assert(w == &s->timer_watch);
 781
 782         switch (s->state) {
 783
 784         case SOCKET_START_PRE:
 785         case SOCKET_START_POST:
 786                 log_warning("%s operation timed out. Stopping.", unit_id(u));
 787                 socket_enter_stop_pre(s, false);
 788                 break;
 789
 790         case SOCKET_STOP_PRE:
 791                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 792                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 793                 break;
 794
 795         case SOCKET_STOP_PRE_SIGTERM:
 796                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 797                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 798                 break;
 799
 800         case SOCKET_STOP_PRE_SIGKILL:
 801                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 802                 socket_enter_stop_post(s, false);
 803                 break;
 804
 805         case SOCKET_STOP_POST:
 806                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 807                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 808                 break;
 809
 810         case SOCKET_STOP_POST_SIGTERM:
 811                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 812                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 813                 break;
 814
 815         case SOCKET_STOP_POST_SIGKILL:
 816                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 817                 socket_enter_dead(s, false);
 818                 break;
 819
 820         default:
 821                 assert_not_reached("Timeout at wrong time.");
 822         }
 823 }
 824
 825 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 826         int *rfds;
 827         unsigned rn_fds, k;
 828         SocketPort *p;
 829
 830         assert(s);
 831         assert(fds);
 832         assert(n_fds);
 833
 834         /* Called from the service code for requesting our fds */
 835
 836         rn_fds = 0;
 837         LIST_FOREACH(port, p, s->ports)
 838                 if (p->fd >= 0)
 839                         rn_fds++;
 840
 841         if (!(rfds = new(int, rn_fds)) < 0)
 842                 return -ENOMEM;
 843
 844         k = 0;
 845         LIST_FOREACH(port, p, s->ports)
 846                 if (p->fd >= 0)
 847                         rfds[k++] = p->fd;
 848
 849         assert(k == rn_fds);
 850
 851         *fds = rfds;
 852         *n_fds = rn_fds;
 853
 854         return 0;
 855 }
 856
 857 void socket_notify_service_dead(Socket *s) {
 858         assert(s);
 859
 860         /* The service is dead. Dang. */
 861
 862         if (s->state == SOCKET_RUNNING) {
 863                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 864                 socket_enter_listening(s);
 865         }
 866 }
 867
 868 const UnitVTable socket_vtable = {
 869         .suffix = ".socket",
 870
 871         .init = socket_init,
 872         .done = socket_done,
 873
 874         .dump = socket_dump,
 875
 876         .start = socket_start,
 877         .stop = socket_stop,
 878
 879         .active_state = socket_active_state,
 880
 881         .fd_event = socket_fd_event,
 882         .sigchld_event = socket_sigchld_event,
 883         .timer_event = socket_timer_event
 884 };