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         /* Add default cgroup */
 133         if ((r = unit_add_default_cgroup(u)) < 0)
 134                 goto fail;
 135
 136         return 0;
 137
 138 fail:
 139         socket_done(u);
 140         return r;
 141 }
 142
 143 static const char* listen_lookup(int type) {
 144
 145         if (type == SOCK_STREAM)
 146                 return "ListenStream";
 147         else if (type == SOCK_DGRAM)
 148                 return "ListenDatagram";
 149         else if (type == SOCK_SEQPACKET)
 150                 return "ListenSequentialPacket";
 151
 152         assert_not_reached("Unknown socket type");
 153         return NULL;
 154 }
 155
 156 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 157
 158         static const char* const command_table[_SOCKET_EXEC_MAX] = {
 159                 [SOCKET_EXEC_START_PRE] = "StartPre",
 160                 [SOCKET_EXEC_START_POST] = "StartPost",
 161                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
 162                 [SOCKET_EXEC_STOP_POST] = "StopPost"
 163         };
 164
 165         SocketExecCommand c;
 166         Socket *s = SOCKET(u);
 167         SocketPort *p;
 168         const char *prefix2;
 169         char *p2;
 170
 171         assert(s);
 172         assert(f);
 173
 174         p2 = strappend(prefix, "\t");
 175         prefix2 = p2 ? p2 : prefix;
 176
 177         fprintf(f,
 178                 "%sSocket State: %s\n"
 179                 "%sBindIPv6Only: %s\n"
 180                 "%sBacklog: %u\n"
 181                 "%sSocketMode: %04o\n"
 182                 "%sDirectoryMode: %04o\n",
 183                 prefix, state_string_table[s->state],
 184                 prefix, yes_no(s->bind_ipv6_only),
 185                 prefix, s->backlog,
 186                 prefix, s->socket_mode,
 187                 prefix, s->directory_mode);
 188
 189         if (s->bind_to_device)
 190                 fprintf(f,
 191                         "%sBindToDevice: %s\n",
 192                         prefix, s->bind_to_device);
 193
 194         LIST_FOREACH(port, p, s->ports) {
 195
 196                 if (p->type == SOCKET_SOCKET) {
 197                         const char *t;
 198                         int r;
 199                         char *k;
 200
 201                         if ((r = socket_address_print(&p->address, &k)) < 0)
 202                                 t = strerror(-r);
 203                         else
 204                                 t = k;
 205
 206                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 207                         free(k);
 208                 } else
 209                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 210         }
 211
 212         exec_context_dump(&s->exec_context, f, prefix);
 213
 214         for (c = 0; c < _SOCKET_EXEC_MAX; c++) {
 215                 if (!s->exec_command[c])
 216                         continue;
 217
 218                 fprintf(f, "%s→ %s:\n",
 219                         prefix, command_table[c]);
 220
 221                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 222         }
 223
 224         free(p2);
 225 }
 226
 227 static void socket_close_fds(Socket *s) {
 228         SocketPort *p;
 229
 230         assert(s);
 231
 232         LIST_FOREACH(port, p, s->ports) {
 233                 if (p->fd < 0)
 234                         continue;
 235
 236                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 237                 assert_se(close_nointr(p->fd) >= 0);
 238
 239                 p->fd = -1;
 240         }
 241 }
 242
 243 static int socket_open_fds(Socket *s) {
 244         SocketPort *p;
 245         int r;
 246
 247         assert(s);
 248
 249         LIST_FOREACH(port, p, s->ports) {
 250
 251                 if (p->fd >= 0)
 252                         continue;
 253
 254                 if (p->type == SOCKET_SOCKET) {
 255
 256                         if ((r = socket_address_listen(
 257                                              &p->address,
 258                                              s->backlog,
 259                                              s->bind_ipv6_only,
 260                                              s->bind_to_device,
 261                                              s->directory_mode,
 262                                              s->socket_mode,
 263                                              &p->fd)) < 0)
 264                                 goto rollback;
 265
 266                 } else {
 267                         struct stat st;
 268                         assert(p->type == SOCKET_FIFO);
 269
 270                         if (mkfifo(p->path, 0666 & ~s->exec_context.umask) < 0 && errno != EEXIST) {
 271                                 r = -errno;
 272                                 goto rollback;
 273                         }
 274
 275                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 276                                 r = -errno;
 277                                 goto rollback;
 278                         }
 279
 280                         if (fstat(p->fd, &st) < 0) {
 281                                 r = -errno;
 282                                 goto rollback;
 283                         }
 284
 285                         /* FIXME verify user, access mode */
 286
 287                         if (!S_ISFIFO(st.st_mode)) {
 288                                 r = -EEXIST;
 289                                 goto rollback;
 290                         }
 291                 }
 292         }
 293
 294         return 0;
 295
 296 rollback:
 297         socket_close_fds(s);
 298         return r;
 299 }
 300
 301 static void socket_unwatch_fds(Socket *s) {
 302         SocketPort *p;
 303
 304         assert(s);
 305
 306         LIST_FOREACH(port, p, s->ports) {
 307                 if (p->fd < 0)
 308                         continue;
 309
 310                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 311         }
 312 }
 313
 314 static int socket_watch_fds(Socket *s) {
 315         SocketPort *p;
 316         int r;
 317
 318         assert(s);
 319
 320         LIST_FOREACH(port, p, s->ports) {
 321                 if (p->fd < 0)
 322                         continue;
 323
 324                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 325                         goto fail;
 326         }
 327
 328         return 0;
 329
 330 fail:
 331         socket_unwatch_fds(s);
 332         return r;
 333 }
 334
 335 static void socket_set_state(Socket *s, SocketState state) {
 336         SocketState old_state;
 337         assert(s);
 338
 339         old_state = s->state;
 340         s->state = state;
 341
 342         if (state != SOCKET_START_PRE &&
 343             state != SOCKET_START_POST &&
 344             state != SOCKET_STOP_PRE &&
 345             state != SOCKET_STOP_PRE_SIGTERM &&
 346             state != SOCKET_STOP_PRE_SIGKILL &&
 347             state != SOCKET_STOP_POST &&
 348             state != SOCKET_STOP_POST_SIGTERM &&
 349             state != SOCKET_STOP_POST_SIGKILL)
 350                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 351
 352         if (state != SOCKET_START_PRE &&
 353             state != SOCKET_START_POST &&
 354             state != SOCKET_STOP_PRE &&
 355             state != SOCKET_STOP_PRE_SIGTERM &&
 356             state != SOCKET_STOP_PRE_SIGKILL &&
 357             state != SOCKET_STOP_POST &&
 358             state != SOCKET_STOP_POST_SIGTERM &&
 359             state != SOCKET_STOP_POST_SIGKILL)
 360                 if (s->control_pid > 0) {
 361                         unit_unwatch_pid(UNIT(s), s->control_pid);
 362                         s->control_pid = 0;
 363                 }
 364
 365         if (state != SOCKET_START_PRE &&
 366             state != SOCKET_START_POST &&
 367             state != SOCKET_STOP_PRE &&
 368             state != SOCKET_STOP_POST)
 369                 s->control_command = NULL;
 370
 371         if (state != SOCKET_START_POST &&
 372             state != SOCKET_LISTENING &&
 373             state != SOCKET_RUNNING &&
 374             state != SOCKET_STOP_PRE &&
 375             state != SOCKET_STOP_PRE_SIGTERM &&
 376             state != SOCKET_STOP_PRE_SIGKILL)
 377                 socket_close_fds(s);
 378
 379         if (state != SOCKET_LISTENING)
 380                 socket_unwatch_fds(s);
 381
 382         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 383
 384         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 385 }
 386
 387 static int socket_spawn(Socket *s, ExecCommand *c, bool timeout, pid_t *_pid) {
 388         pid_t pid;
 389         int r;
 390
 391         assert(s);
 392         assert(c);
 393         assert(_pid);
 394
 395         if (timeout) {
 396                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 397                         goto fail;
 398         } else
 399                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 400
 401         if ((r = exec_spawn(c,
 402                             &s->exec_context,
 403                             NULL, 0,
 404                             true,
 405                             true,
 406                             UNIT(s)->meta.cgroup_bondings,
 407                             &pid)) < 0)
 408                 goto fail;
 409
 410         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 411                 /* FIXME: we need to do something here */
 412                 goto fail;
 413
 414         *_pid = pid;
 415
 416         return 0;
 417
 418 fail:
 419         if (timeout)
 420                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 421
 422         return r;
 423 }
 424
 425 static void socket_enter_dead(Socket *s, bool success) {
 426         assert(s);
 427
 428         if (!success)
 429                 s->failure = true;
 430
 431         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 432 }
 433
 434 static void socket_enter_stop_post(Socket *s, bool success) {
 435         int r;
 436         assert(s);
 437
 438         if (!success)
 439                 s->failure = true;
 440
 441         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
 442                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 443                         goto fail;
 444
 445         socket_set_state(s, SOCKET_STOP_POST);
 446
 447         if (!s->control_command)
 448                 socket_enter_dead(s, true);
 449
 450         return;
 451
 452 fail:
 453         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 454         socket_enter_dead(s, false);
 455 }
 456
 457 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 458         int r;
 459
 460         assert(s);
 461
 462         if (!success)
 463                 s->failure = true;
 464
 465         if (s->control_pid > 0) {
 466                 int sig;
 467
 468                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 469
 470                 if (kill(s->control_pid, sig) < 0 && errno != ESRCH) {
 471                         r = -errno;
 472                         goto fail;
 473                 }
 474         }
 475
 476         socket_set_state(s, state);
 477
 478         if (s->control_pid <= 0)
 479                 socket_enter_dead(s, true);
 480
 481         return;
 482
 483 fail:
 484         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 485
 486         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 487                 socket_enter_stop_post(s, false);
 488         else
 489                 socket_enter_dead(s, false);
 490 }
 491
 492 static void socket_enter_stop_pre(Socket *s, bool success) {
 493         int r;
 494         assert(s);
 495
 496         if (!success)
 497                 s->failure = true;
 498
 499         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
 500                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 501                         goto fail;
 502
 503         socket_set_state(s, SOCKET_STOP_PRE);
 504
 505         if (!s->control_command)
 506                 socket_enter_stop_post(s, true);
 507
 508         return;
 509
 510 fail:
 511         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 512         socket_enter_stop_post(s, false);
 513 }
 514
 515 static void socket_enter_listening(Socket *s) {
 516         int r;
 517         assert(s);
 518
 519         if ((r = socket_watch_fds(s)) < 0) {
 520                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 521                 goto fail;
 522         }
 523
 524         socket_set_state(s, SOCKET_LISTENING);
 525         return;
 526
 527 fail:
 528         socket_enter_stop_pre(s, false);
 529 }
 530
 531 static void socket_enter_start_post(Socket *s) {
 532         int r;
 533         assert(s);
 534
 535         if ((r = socket_open_fds(s)) < 0) {
 536                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 537                 goto fail;
 538         }
 539
 540         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
 541                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
 542                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 543                         goto fail;
 544                 }
 545
 546         socket_set_state(s, SOCKET_START_POST);
 547
 548         if (!s->control_command)
 549                 socket_enter_listening(s);
 550
 551         return;
 552
 553 fail:
 554         socket_enter_stop_pre(s, false);
 555 }
 556
 557 static void socket_enter_start_pre(Socket *s) {
 558         int r;
 559         assert(s);
 560
 561         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
 562                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 563                         goto fail;
 564
 565         socket_set_state(s, SOCKET_START_PRE);
 566
 567         if (!s->control_command)
 568                 socket_enter_start_post(s);
 569
 570         return;
 571
 572 fail:
 573         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 574         socket_enter_dead(s, false);
 575 }
 576
 577 static void socket_enter_running(Socket *s) {
 578         int r;
 579
 580         assert(s);
 581
 582         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 583                 goto fail;
 584
 585         socket_set_state(s, SOCKET_RUNNING);
 586         return;
 587
 588 fail:
 589         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 590         socket_enter_dead(s, false);
 591 }
 592
 593 static void socket_run_next(Socket *s, bool success) {
 594         int r;
 595
 596         assert(s);
 597         assert(s->control_command);
 598         assert(s->control_command->command_next);
 599
 600         if (!success)
 601                 s->failure = true;
 602
 603         s->control_command = s->control_command->command_next;
 604
 605         if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 606                 goto fail;
 607
 608         return;
 609
 610 fail:
 611         if (s->state == SOCKET_STOP_PRE)
 612                 socket_enter_stop_post(s, false);
 613         else if (s->state == SOCKET_STOP_POST)
 614                 socket_enter_dead(s, false);
 615         else
 616                 socket_enter_stop_pre(s, false);
 617 }
 618
 619 static int socket_start(Unit *u) {
 620         Socket *s = SOCKET(u);
 621
 622         assert(s);
 623
 624         /* We cannot fulfill this request right now, try again later
 625          * please! */
 626         if (s->state == SOCKET_STOP_PRE ||
 627             s->state == SOCKET_STOP_PRE_SIGKILL ||
 628             s->state == SOCKET_STOP_PRE_SIGTERM ||
 629             s->state == SOCKET_STOP_POST ||
 630             s->state == SOCKET_STOP_POST_SIGTERM ||
 631             s->state == SOCKET_STOP_POST_SIGKILL)
 632                 return -EAGAIN;
 633
 634         if (s->state == SOCKET_START_PRE ||
 635             s->state == SOCKET_START_POST)
 636                 return 0;
 637
 638         /* Cannot run this without the service being around */
 639         if (s->service->meta.load_state != UNIT_LOADED)
 640                 return -ENOENT;
 641
 642         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 643
 644         s->failure = false;
 645         socket_enter_start_pre(s);
 646         return 0;
 647 }
 648
 649 static int socket_stop(Unit *u) {
 650         Socket *s = SOCKET(u);
 651
 652         assert(s);
 653
 654         /* We cannot fulfill this request right now, try again later
 655          * please! */
 656         if (s->state == SOCKET_START_PRE ||
 657             s->state == SOCKET_START_POST)
 658                 return -EAGAIN;
 659
 660         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 661
 662         socket_enter_stop_pre(s, true);
 663         return 0;
 664 }
 665
 666 static UnitActiveState socket_active_state(Unit *u) {
 667         assert(u);
 668
 669         return state_translation_table[SOCKET(u)->state];
 670 }
 671
 672 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 673         Socket *s = SOCKET(u);
 674
 675         assert(s);
 676
 677         log_debug("Incoming traffic on %s", unit_id(u));
 678
 679         if (events != EPOLLIN)
 680                 socket_enter_stop_pre(s, false);
 681
 682         socket_enter_running(s);
 683 }
 684
 685 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 686         Socket *s = SOCKET(u);
 687         bool success;
 688
 689         assert(s);
 690         assert(pid >= 0);
 691
 692         success = code == CLD_EXITED && status == 0;
 693         s->failure = s->failure || !success;
 694
 695         assert(s->control_pid == pid);
 696         assert(s->control_command);
 697
 698         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 699         s->control_pid = 0;
 700
 701         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 702
 703         if (s->control_command->command_next &&
 704             (success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
 705                 log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
 706                 socket_run_next(s, success);
 707         } else {
 708                 /* No further commands for this step, so let's figure
 709                  * out what to do next */
 710
 711                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 712
 713                 switch (s->state) {
 714
 715                 case SOCKET_START_PRE:
 716                         if (success)
 717                                 socket_enter_start_post(s);
 718                         else
 719                                 socket_enter_stop_pre(s, false);
 720                         break;
 721
 722                 case SOCKET_START_POST:
 723                         if (success)
 724                                 socket_enter_listening(s);
 725                         else
 726                                 socket_enter_stop_pre(s, false);
 727                         break;
 728
 729                 case SOCKET_STOP_PRE:
 730                 case SOCKET_STOP_PRE_SIGTERM:
 731                 case SOCKET_STOP_PRE_SIGKILL:
 732                         socket_enter_stop_post(s, success);
 733                         break;
 734
 735                 case SOCKET_STOP_POST:
 736                 case SOCKET_STOP_POST_SIGTERM:
 737                 case SOCKET_STOP_POST_SIGKILL:
 738                         socket_enter_dead(s, success);
 739                         break;
 740
 741                 default:
 742                         assert_not_reached("Uh, control process died at wrong time.");
 743                 }
 744         }
 745 }
 746
 747 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 748         Socket *s = SOCKET(u);
 749
 750         assert(s);
 751         assert(elapsed == 1);
 752
 753         assert(w == &s->timer_watch);
 754
 755         switch (s->state) {
 756
 757         case SOCKET_START_PRE:
 758         case SOCKET_START_POST:
 759                 log_warning("%s operation timed out. Stopping.", unit_id(u));
 760                 socket_enter_stop_pre(s, false);
 761                 break;
 762
 763         case SOCKET_STOP_PRE:
 764                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 765                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 766                 break;
 767
 768         case SOCKET_STOP_PRE_SIGTERM:
 769                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 770                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 771                 break;
 772
 773         case SOCKET_STOP_PRE_SIGKILL:
 774                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 775                 socket_enter_stop_post(s, false);
 776                 break;
 777
 778         case SOCKET_STOP_POST:
 779                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 780                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 781                 break;
 782
 783         case SOCKET_STOP_POST_SIGTERM:
 784                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 785                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 786                 break;
 787
 788         case SOCKET_STOP_POST_SIGKILL:
 789                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 790                 socket_enter_dead(s, false);
 791                 break;
 792
 793         default:
 794                 assert_not_reached("Timeout at wrong time.");
 795         }
 796 }
 797
 798 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 799         int *rfds;
 800         unsigned rn_fds, k;
 801         SocketPort *p;
 802
 803         assert(s);
 804         assert(fds);
 805         assert(n_fds);
 806
 807         /* Called from the service code for requesting our fds */
 808
 809         rn_fds = 0;
 810         LIST_FOREACH(port, p, s->ports)
 811                 if (p->fd >= 0)
 812                         rn_fds++;
 813
 814         if (!(rfds = new(int, rn_fds)) < 0)
 815                 return -ENOMEM;
 816
 817         k = 0;
 818         LIST_FOREACH(port, p, s->ports)
 819                 if (p->fd >= 0)
 820                         rfds[k++] = p->fd;
 821
 822         assert(k == rn_fds);
 823
 824         *fds = rfds;
 825         *n_fds = rn_fds;
 826
 827         return 0;
 828 }
 829
 830 void socket_notify_service_dead(Socket *s) {
 831         assert(s);
 832
 833         /* The service is dead. Dang. */
 834
 835         if (s->state == SOCKET_RUNNING) {
 836                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 837                 socket_enter_listening(s);
 838         }
 839 }
 840
 841 const UnitVTable socket_vtable = {
 842         .suffix = ".socket",
 843
 844         .init = socket_init,
 845         .done = socket_done,
 846
 847         .dump = socket_dump,
 848
 849         .start = socket_start,
 850         .stop = socket_stop,
 851
 852         .active_state = socket_active_state,
 853
 854         .fd_event = socket_fd_event,
 855         .sigchld_event = socket_sigchld_event,
 856         .timer_event = socket_timer_event
 857 };