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_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  47         [SOCKET_FINAL_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_FINAL_SIGTERM] = "final-sigterm",
  62         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
  63         [SOCKET_MAINTAINANCE] = "maintainance"
  64 };
  65
  66 static void socket_unwatch_control_pid(Socket *s) {
  67         assert(s);
  68
  69         if (s->control_pid <= 0)
  70                 return;
  71
  72         unit_unwatch_pid(UNIT(s), s->control_pid);
  73         s->control_pid = 0;
  74 }
  75
  76 static void socket_done(Unit *u) {
  77         Socket *s = SOCKET(u);
  78         SocketPort *p;
  79
  80         assert(s);
  81
  82         while ((p = s->ports)) {
  83                 LIST_REMOVE(SocketPort, port, s->ports, p);
  84
  85                 if (p->fd >= 0)
  86                         close_nointr(p->fd);
  87                 free(p->path);
  88                 free(p);
  89         }
  90
  91         exec_context_done(&s->exec_context);
  92         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
  93         s->control_command = NULL;
  94
  95         socket_unwatch_control_pid(s);
  96
  97         s->service = NULL;
  98
  99         free(s->bind_to_device);
 100         s->bind_to_device = NULL;
 101
 102         unit_unwatch_timer(u, &s->timer_watch);
 103 }
 104
 105 static void socket_init(Unit *u) {
 106         Socket *s = SOCKET(u);
 107
 108         assert(u);
 109         assert(u->meta.load_state == UNIT_STUB);
 110
 111         s->state = 0;
 112         s->timer_watch.type = WATCH_INVALID;
 113         s->bind_ipv6_only = false;
 114         s->backlog = SOMAXCONN;
 115         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
 116         s->directory_mode = 0755;
 117         s->socket_mode = 0666;
 118         s->kill_mode = 0;
 119         s->failure = false;
 120         s->control_pid = 0;
 121         s->service = NULL;
 122         exec_context_init(&s->exec_context);
 123 }
 124
 125 static int socket_load(Unit *u) {
 126         Socket *s = SOCKET(u);
 127         int r;
 128
 129         assert(u);
 130         assert(u->meta.load_state == UNIT_STUB);
 131
 132         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 133                 return r;
 134
 135         /* This is a new unit? Then let's add in some extras */
 136         if (u->meta.load_state == UNIT_LOADED) {
 137
 138                 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)))
 139                         return r;
 140
 141                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service))) < 0)
 142                         return r;
 143
 144                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 145                         return r;
 146
 147                 if ((r = unit_add_default_cgroup(u)) < 0)
 148                         return r;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static const char* listen_lookup(int type) {
 155
 156         if (type == SOCK_STREAM)
 157                 return "ListenStream";
 158         else if (type == SOCK_DGRAM)
 159                 return "ListenDatagram";
 160         else if (type == SOCK_SEQPACKET)
 161                 return "ListenSequentialPacket";
 162
 163         assert_not_reached("Unknown socket type");
 164         return NULL;
 165 }
 166
 167 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 168
 169         static const char* const command_table[_SOCKET_EXEC_COMMAND_MAX] = {
 170                 [SOCKET_EXEC_START_PRE] = "StartPre",
 171                 [SOCKET_EXEC_START_POST] = "StartPost",
 172                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
 173                 [SOCKET_EXEC_STOP_POST] = "StopPost"
 174         };
 175
 176         SocketExecCommand c;
 177         Socket *s = SOCKET(u);
 178         SocketPort *p;
 179         const char *prefix2;
 180         char *p2;
 181
 182         assert(s);
 183         assert(f);
 184
 185         p2 = strappend(prefix, "\t");
 186         prefix2 = p2 ? p2 : prefix;
 187
 188         fprintf(f,
 189                 "%sSocket State: %s\n"
 190                 "%sBindIPv6Only: %s\n"
 191                 "%sBacklog: %u\n"
 192                 "%sKillMode: %s\n"
 193                 "%sSocketMode: %04o\n"
 194                 "%sDirectoryMode: %04o\n",
 195                 prefix, state_string_table[s->state],
 196                 prefix, yes_no(s->bind_ipv6_only),
 197                 prefix, s->backlog,
 198                 prefix, kill_mode_to_string(s->kill_mode),
 199                 prefix, s->socket_mode,
 200                 prefix, s->directory_mode);
 201
 202         if (s->control_pid > 0)
 203                 fprintf(f,
 204                         "%sControl PID: %llu\n",
 205                         prefix, (unsigned long long) s->control_pid);
 206
 207         if (s->bind_to_device)
 208                 fprintf(f,
 209                         "%sBindToDevice: %s\n",
 210                         prefix, s->bind_to_device);
 211
 212         LIST_FOREACH(port, p, s->ports) {
 213
 214                 if (p->type == SOCKET_SOCKET) {
 215                         const char *t;
 216                         int r;
 217                         char *k;
 218
 219                         if ((r = socket_address_print(&p->address, &k)) < 0)
 220                                 t = strerror(-r);
 221                         else
 222                                 t = k;
 223
 224                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 225                         free(k);
 226                 } else
 227                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 228         }
 229
 230         exec_context_dump(&s->exec_context, f, prefix);
 231
 232         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 233                 if (!s->exec_command[c])
 234                         continue;
 235
 236                 fprintf(f, "%s→ %s:\n",
 237                         prefix, command_table[c]);
 238
 239                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 240         }
 241
 242         free(p2);
 243 }
 244
 245 static void socket_close_fds(Socket *s) {
 246         SocketPort *p;
 247
 248         assert(s);
 249
 250         LIST_FOREACH(port, p, s->ports) {
 251                 if (p->fd < 0)
 252                         continue;
 253
 254                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 255                 assert_se(close_nointr(p->fd) >= 0);
 256
 257                 p->fd = -1;
 258         }
 259 }
 260
 261 static int socket_open_fds(Socket *s) {
 262         SocketPort *p;
 263         int r;
 264
 265         assert(s);
 266
 267         LIST_FOREACH(port, p, s->ports) {
 268
 269                 if (p->fd >= 0)
 270                         continue;
 271
 272                 if (p->type == SOCKET_SOCKET) {
 273
 274                         if ((r = socket_address_listen(
 275                                              &p->address,
 276                                              s->backlog,
 277                                              s->bind_ipv6_only,
 278                                              s->bind_to_device,
 279                                              s->directory_mode,
 280                                              s->socket_mode,
 281                                              &p->fd)) < 0)
 282                                 goto rollback;
 283
 284                 } else {
 285                         struct stat st;
 286                         assert(p->type == SOCKET_FIFO);
 287
 288                         mkdir_parents(p->path, s->directory_mode);
 289
 290                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 291                                 r = -errno;
 292                                 goto rollback;
 293                         }
 294
 295                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 296                                 r = -errno;
 297                                 goto rollback;
 298                         }
 299
 300                         if (fstat(p->fd, &st) < 0) {
 301                                 r = -errno;
 302                                 goto rollback;
 303                         }
 304
 305                         /* FIXME verify user, access mode */
 306
 307                         if (!S_ISFIFO(st.st_mode)) {
 308                                 r = -EEXIST;
 309                                 goto rollback;
 310                         }
 311                 }
 312         }
 313
 314         return 0;
 315
 316 rollback:
 317         socket_close_fds(s);
 318         return r;
 319 }
 320
 321 static void socket_unwatch_fds(Socket *s) {
 322         SocketPort *p;
 323
 324         assert(s);
 325
 326         LIST_FOREACH(port, p, s->ports) {
 327                 if (p->fd < 0)
 328                         continue;
 329
 330                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 331         }
 332 }
 333
 334 static int socket_watch_fds(Socket *s) {
 335         SocketPort *p;
 336         int r;
 337
 338         assert(s);
 339
 340         LIST_FOREACH(port, p, s->ports) {
 341                 if (p->fd < 0)
 342                         continue;
 343
 344                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 345                         goto fail;
 346         }
 347
 348         return 0;
 349
 350 fail:
 351         socket_unwatch_fds(s);
 352         return r;
 353 }
 354
 355 static void socket_set_state(Socket *s, SocketState state) {
 356         SocketState old_state;
 357         assert(s);
 358
 359         old_state = s->state;
 360         s->state = state;
 361
 362         if (state != SOCKET_START_PRE &&
 363             state != SOCKET_START_POST &&
 364             state != SOCKET_STOP_PRE &&
 365             state != SOCKET_STOP_PRE_SIGTERM &&
 366             state != SOCKET_STOP_PRE_SIGKILL &&
 367             state != SOCKET_STOP_POST &&
 368             state != SOCKET_FINAL_SIGTERM &&
 369             state != SOCKET_FINAL_SIGKILL) {
 370                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 371                 socket_unwatch_control_pid(s);
 372                 s->control_command = NULL;
 373         }
 374
 375         if (state != SOCKET_START_POST &&
 376             state != SOCKET_LISTENING &&
 377             state != SOCKET_RUNNING &&
 378             state != SOCKET_STOP_PRE &&
 379             state != SOCKET_STOP_PRE_SIGTERM &&
 380             state != SOCKET_STOP_PRE_SIGKILL)
 381                 socket_close_fds(s);
 382
 383         if (state != SOCKET_LISTENING)
 384                 socket_unwatch_fds(s);
 385
 386         if (state != old_state)
 387                 log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 388
 389         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 390 }
 391
 392 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 393         pid_t pid;
 394         int r;
 395
 396         assert(s);
 397         assert(c);
 398         assert(_pid);
 399
 400         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 401                 goto fail;
 402
 403         if ((r = exec_spawn(c,
 404                             &s->exec_context,
 405                             NULL, 0,
 406                             true,
 407                             true,
 408                             UNIT(s)->meta.manager->confirm_spawn,
 409                             UNIT(s)->meta.cgroup_bondings,
 410                             &pid)) < 0)
 411                 goto fail;
 412
 413         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 414                 /* FIXME: we need to do something here */
 415                 goto fail;
 416
 417         *_pid = pid;
 418
 419         return 0;
 420
 421 fail:
 422         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 423
 424         return r;
 425 }
 426
 427 static void socket_enter_dead(Socket *s, bool success) {
 428         assert(s);
 429
 430         if (!success)
 431                 s->failure = true;
 432
 433         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 434 }
 435
 436 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 437
 438 static void socket_enter_stop_post(Socket *s, bool success) {
 439         int r;
 440         assert(s);
 441
 442         if (!success)
 443                 s->failure = true;
 444
 445         socket_unwatch_control_pid(s);
 446
 447         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 448                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 449                         goto fail;
 450
 451                 socket_set_state(s, SOCKET_STOP_POST);
 452         } else
 453                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
 454
 455         return;
 456
 457 fail:
 458         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 459         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 460 }
 461
 462 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 463         int r;
 464         bool sent = false;
 465
 466         assert(s);
 467
 468         if (!success)
 469                 s->failure = true;
 470
 471         if (s->kill_mode != KILL_NONE) {
 472                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
 473
 474                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 475
 476                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 477                                 if (r != -EAGAIN && r != -ESRCH)
 478                                         goto fail;
 479                         } else
 480                                 sent = true;
 481                 }
 482
 483                 if (!sent && s->control_pid > 0)
 484                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 485                                 r = -errno;
 486                                 goto fail;
 487                         }
 488         }
 489
 490         if (sent) {
 491                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 492                         goto fail;
 493
 494                 socket_set_state(s, state);
 495         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 496                 socket_enter_stop_post(s, true);
 497         else
 498                 socket_enter_dead(s, true);
 499
 500         return;
 501
 502 fail:
 503         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 504
 505         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 506                 socket_enter_stop_post(s, false);
 507         else
 508                 socket_enter_dead(s, false);
 509 }
 510
 511 static void socket_enter_stop_pre(Socket *s, bool success) {
 512         int r;
 513         assert(s);
 514
 515         if (!success)
 516                 s->failure = true;
 517
 518         socket_unwatch_control_pid(s);
 519
 520         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
 521                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 522                         goto fail;
 523
 524                 socket_set_state(s, SOCKET_STOP_PRE);
 525         } else
 526                 socket_enter_stop_post(s, true);
 527
 528         return;
 529
 530 fail:
 531         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 532         socket_enter_stop_post(s, false);
 533 }
 534
 535 static void socket_enter_listening(Socket *s) {
 536         int r;
 537         assert(s);
 538
 539         if ((r = socket_watch_fds(s)) < 0) {
 540                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 541                 goto fail;
 542         }
 543
 544         socket_set_state(s, SOCKET_LISTENING);
 545         return;
 546
 547 fail:
 548         socket_enter_stop_pre(s, false);
 549 }
 550
 551 static void socket_enter_start_post(Socket *s) {
 552         int r;
 553         assert(s);
 554
 555         if ((r = socket_open_fds(s)) < 0) {
 556                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 557                 goto fail;
 558         }
 559
 560         socket_unwatch_control_pid(s);
 561
 562         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
 563                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
 564                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 565                         goto fail;
 566                 }
 567
 568                 socket_set_state(s, SOCKET_START_POST);
 569         } else
 570                 socket_enter_listening(s);
 571
 572         return;
 573
 574 fail:
 575         socket_enter_stop_pre(s, false);
 576 }
 577
 578 static void socket_enter_start_pre(Socket *s) {
 579         int r;
 580         assert(s);
 581
 582         socket_unwatch_control_pid(s);
 583
 584         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
 585                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 586                         goto fail;
 587
 588                 socket_set_state(s, SOCKET_START_PRE);
 589         } else
 590                 socket_enter_start_post(s);
 591
 592         return;
 593
 594 fail:
 595         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 596         socket_enter_dead(s, false);
 597 }
 598
 599 static void socket_enter_running(Socket *s) {
 600         int r;
 601
 602         assert(s);
 603
 604         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 605                 goto fail;
 606
 607         socket_set_state(s, SOCKET_RUNNING);
 608         return;
 609
 610 fail:
 611         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 612         socket_enter_stop_pre(s, false);
 613 }
 614
 615 static void socket_run_next(Socket *s, bool success) {
 616         int r;
 617
 618         assert(s);
 619         assert(s->control_command);
 620         assert(s->control_command->command_next);
 621
 622         if (!success)
 623                 s->failure = true;
 624
 625         socket_unwatch_control_pid(s);
 626
 627         s->control_command = s->control_command->command_next;
 628
 629         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 630                 goto fail;
 631
 632         return;
 633
 634 fail:
 635         log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
 636
 637         if (s->state == SOCKET_START_POST)
 638                 socket_enter_stop_pre(s, false);
 639         else if (s->state == SOCKET_STOP_POST)
 640                 socket_enter_dead(s, false);
 641         else
 642                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 643 }
 644
 645 static int socket_start(Unit *u) {
 646         Socket *s = SOCKET(u);
 647
 648         assert(s);
 649
 650         /* We cannot fulfill this request right now, try again later
 651          * please! */
 652         if (s->state == SOCKET_STOP_PRE ||
 653             s->state == SOCKET_STOP_PRE_SIGKILL ||
 654             s->state == SOCKET_STOP_PRE_SIGTERM ||
 655             s->state == SOCKET_STOP_POST ||
 656             s->state == SOCKET_FINAL_SIGTERM ||
 657             s->state == SOCKET_FINAL_SIGKILL)
 658                 return -EAGAIN;
 659
 660         if (s->state == SOCKET_START_PRE ||
 661             s->state == SOCKET_START_POST)
 662                 return 0;
 663
 664         /* Cannot run this without the service being around */
 665         if (s->service->meta.load_state != UNIT_LOADED)
 666                 return -ENOENT;
 667
 668         /* If the service is alredy actvie we cannot start the
 669          * socket */
 670         if (s->service->state != SERVICE_DEAD &&
 671             s->service->state != SERVICE_MAINTAINANCE &&
 672             s->service->state != SERVICE_AUTO_RESTART)
 673                 return -EBUSY;
 674
 675         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 676
 677         s->failure = false;
 678         socket_enter_start_pre(s);
 679         return 0;
 680 }
 681
 682 static int socket_stop(Unit *u) {
 683         Socket *s = SOCKET(u);
 684
 685         assert(s);
 686
 687         /* We cannot fulfill this request right now, try again later
 688          * please! */
 689         if (s->state == SOCKET_START_PRE ||
 690             s->state == SOCKET_START_POST)
 691                 return -EAGAIN;
 692
 693         /* Already on it */
 694         if (s->state == SOCKET_STOP_PRE ||
 695             s->state == SOCKET_STOP_PRE_SIGTERM ||
 696             s->state == SOCKET_STOP_PRE_SIGKILL ||
 697             s->state == SOCKET_STOP_POST ||
 698             s->state == SOCKET_FINAL_SIGTERM ||
 699             s->state == SOCKET_FINAL_SIGTERM)
 700                 return 0;
 701
 702         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 703
 704         socket_enter_stop_pre(s, true);
 705         return 0;
 706 }
 707
 708 static UnitActiveState socket_active_state(Unit *u) {
 709         assert(u);
 710
 711         return state_translation_table[SOCKET(u)->state];
 712 }
 713
 714 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 715         Socket *s = SOCKET(u);
 716
 717         assert(s);
 718
 719         log_debug("Incoming traffic on %s", unit_id(u));
 720
 721         if (events != EPOLLIN)
 722                 socket_enter_stop_pre(s, false);
 723
 724         socket_enter_running(s);
 725 }
 726
 727 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 728         Socket *s = SOCKET(u);
 729         bool success;
 730
 731         assert(s);
 732         assert(pid >= 0);
 733
 734         success = code == CLD_EXITED && status == 0;
 735         s->failure = s->failure || !success;
 736
 737         assert(s->control_pid == pid);
 738         assert(s->control_command);
 739
 740         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 741         s->control_pid = 0;
 742
 743         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 744
 745         if (s->control_command->command_next && success) {
 746                 log_debug("%s running next command for state %s", unit_id(u), state_string_table[s->state]);
 747                 socket_run_next(s, success);
 748         } else {
 749                 /* No further commands for this step, so let's figure
 750                  * out what to do next */
 751
 752                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 753
 754                 switch (s->state) {
 755
 756                 case SOCKET_START_PRE:
 757                         if (success)
 758                                 socket_enter_start_post(s);
 759                         else
 760                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 761                         break;
 762
 763                 case SOCKET_START_POST:
 764                         if (success)
 765                                 socket_enter_listening(s);
 766                         else
 767                                 socket_enter_stop_pre(s, false);
 768                         break;
 769
 770                 case SOCKET_STOP_PRE:
 771                 case SOCKET_STOP_PRE_SIGTERM:
 772                 case SOCKET_STOP_PRE_SIGKILL:
 773                         socket_enter_stop_post(s, success);
 774                         break;
 775
 776                 case SOCKET_STOP_POST:
 777                 case SOCKET_FINAL_SIGTERM:
 778                 case SOCKET_FINAL_SIGKILL:
 779                         socket_enter_dead(s, success);
 780                         break;
 781
 782                 default:
 783                         assert_not_reached("Uh, control process died at wrong time.");
 784                 }
 785         }
 786 }
 787
 788 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 789         Socket *s = SOCKET(u);
 790
 791         assert(s);
 792         assert(elapsed == 1);
 793         assert(w == &s->timer_watch);
 794
 795         switch (s->state) {
 796
 797         case SOCKET_START_PRE:
 798                 log_warning("%s starting timed out. Terminating.", unit_id(u));
 799                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 800
 801         case SOCKET_START_POST:
 802                 log_warning("%s starting timed out. Stopping.", unit_id(u));
 803                 socket_enter_stop_pre(s, false);
 804                 break;
 805
 806         case SOCKET_STOP_PRE:
 807                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 808                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 809                 break;
 810
 811         case SOCKET_STOP_PRE_SIGTERM:
 812                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 813                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 814                 break;
 815
 816         case SOCKET_STOP_PRE_SIGKILL:
 817                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 818                 socket_enter_stop_post(s, false);
 819                 break;
 820
 821         case SOCKET_STOP_POST:
 822                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 823                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 824                 break;
 825
 826         case SOCKET_FINAL_SIGTERM:
 827                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 828                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
 829                 break;
 830
 831         case SOCKET_FINAL_SIGKILL:
 832                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 833                 socket_enter_dead(s, false);
 834                 break;
 835
 836         default:
 837                 assert_not_reached("Timeout at wrong time.");
 838         }
 839 }
 840
 841 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 842         int *rfds;
 843         unsigned rn_fds, k;
 844         SocketPort *p;
 845
 846         assert(s);
 847         assert(fds);
 848         assert(n_fds);
 849
 850         /* Called from the service code for requesting our fds */
 851
 852         rn_fds = 0;
 853         LIST_FOREACH(port, p, s->ports)
 854                 if (p->fd >= 0)
 855                         rn_fds++;
 856
 857         if (!(rfds = new(int, rn_fds)) < 0)
 858                 return -ENOMEM;
 859
 860         k = 0;
 861         LIST_FOREACH(port, p, s->ports)
 862                 if (p->fd >= 0)
 863                         rfds[k++] = p->fd;
 864
 865         assert(k == rn_fds);
 866
 867         *fds = rfds;
 868         *n_fds = rn_fds;
 869
 870         return 0;
 871 }
 872
 873 void socket_notify_service_dead(Socket *s) {
 874         assert(s);
 875
 876         /* The service is dead. Dang. */
 877
 878         if (s->state == SOCKET_RUNNING) {
 879                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 880                 socket_enter_listening(s);
 881         }
 882 }
 883
 884 const UnitVTable socket_vtable = {
 885         .suffix = ".socket",
 886
 887         .init = socket_init,
 888         .load = socket_load,
 889         .done = socket_done,
 890
 891         .dump = socket_dump,
 892
 893         .start = socket_start,
 894         .stop = socket_stop,
 895
 896         .active_state = socket_active_state,
 897
 898         .fd_event = socket_fd_event,
 899         .sigchld_event = socket_sigchld_event,
 900         .timer_event = socket_timer_event
 901 };