src/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 #include <arpa/inet.h>
  30
  31 #include "unit.h"
  32 #include "socket.h"
  33 #include "log.h"
  34 #include "load-dropin.h"
  35 #include "load-fragment.h"
  36 #include "strv.h"
  37 #include "unit-name.h"
  38 #include "dbus-socket.h"
  39
  40 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  41         [SOCKET_DEAD] = UNIT_INACTIVE,
  42         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  43         [SOCKET_START_POST] = UNIT_ACTIVATING,
  44         [SOCKET_LISTENING] = UNIT_ACTIVE,
  45         [SOCKET_RUNNING] = UNIT_ACTIVE,
  46         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  47         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  48         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  49         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  50         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  51         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  52         [SOCKET_MAINTENANCE] = UNIT_INACTIVE,
  53 };
  54
  55 static void socket_init(Unit *u) {
  56         Socket *s = SOCKET(u);
  57
  58         assert(u);
  59         assert(u->meta.load_state == UNIT_STUB);
  60
  61         s->backlog = SOMAXCONN;
  62         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  63         s->directory_mode = 0755;
  64         s->socket_mode = 0666;
  65
  66         s->max_connections = 64;
  67
  68         exec_context_init(&s->exec_context);
  69
  70         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  71 }
  72
  73 static void socket_unwatch_control_pid(Socket *s) {
  74         assert(s);
  75
  76         if (s->control_pid <= 0)
  77                 return;
  78
  79         unit_unwatch_pid(UNIT(s), s->control_pid);
  80         s->control_pid = 0;
  81 }
  82
  83 static void socket_done(Unit *u) {
  84         Socket *s = SOCKET(u);
  85         SocketPort *p;
  86         Meta *i;
  87
  88         assert(s);
  89
  90         while ((p = s->ports)) {
  91                 LIST_REMOVE(SocketPort, port, s->ports, p);
  92
  93                 if (p->fd >= 0) {
  94                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
  95                         close_nointr_nofail(p->fd);
  96                 }
  97
  98                 free(p->path);
  99                 free(p);
 100         }
 101
 102         exec_context_done(&s->exec_context);
 103         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 104         s->control_command = NULL;
 105
 106         socket_unwatch_control_pid(s);
 107
 108         s->service = NULL;
 109
 110         free(s->bind_to_device);
 111         s->bind_to_device = NULL;
 112
 113         unit_unwatch_timer(u, &s->timer_watch);
 114
 115         /* Make sure no service instance refers to us anymore. */
 116         LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
 117                 Service *service = (Service *) i;
 118
 119                 if (service->socket == s)
 120                         service->socket = NULL;
 121         }
 122 }
 123
 124 static bool have_non_accept_socket(Socket *s) {
 125         SocketPort *p;
 126
 127         assert(s);
 128
 129         if (!s->accept)
 130                 return true;
 131
 132         LIST_FOREACH(port, p, s->ports) {
 133
 134                 if (p->type != SOCKET_SOCKET)
 135                         return true;
 136
 137                 if (!socket_address_can_accept(&p->address))
 138                         return true;
 139         }
 140
 141         return false;
 142 }
 143
 144 static int socket_verify(Socket *s) {
 145         assert(s);
 146
 147         if (s->meta.load_state != UNIT_LOADED)
 148                 return 0;
 149
 150         if (!s->ports) {
 151                 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
 152                 return -EINVAL;
 153         }
 154
 155         if (s->accept && s->max_connections <= 0) {
 156                 log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->meta.id);
 157                 return -EINVAL;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static bool socket_needs_mount(Socket *s, const char *prefix) {
 164         SocketPort *p;
 165
 166         assert(s);
 167
 168         LIST_FOREACH(port, p, s->ports) {
 169
 170                 if (p->type == SOCKET_SOCKET) {
 171                         if (socket_address_needs_mount(&p->address, prefix))
 172                                 return true;
 173                 } else {
 174                         assert(p->type == SOCKET_FIFO);
 175                         if (path_startswith(p->path, prefix))
 176                                 return true;
 177                 }
 178         }
 179
 180         return false;
 181 }
 182
 183 int socket_add_one_mount_link(Socket *s, Mount *m) {
 184         int r;
 185
 186         assert(s);
 187         assert(m);
 188
 189         if (s->meta.load_state != UNIT_LOADED ||
 190             m->meta.load_state != UNIT_LOADED)
 191                 return 0;
 192
 193         if (!socket_needs_mount(s, m->where))
 194                 return 0;
 195
 196         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(s), true)) < 0)
 197                 return r;
 198
 199         if ((r = unit_add_dependency(UNIT(s), UNIT_REQUIRES, UNIT(m), true)) < 0)
 200                 return r;
 201
 202         return 0;
 203 }
 204
 205 static int socket_add_mount_links(Socket *s) {
 206         Meta *other;
 207         int r;
 208
 209         assert(s);
 210
 211         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 212                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 213                         return r;
 214
 215         return 0;
 216 }
 217
 218 static int socket_add_device_link(Socket *s) {
 219         char *t;
 220         int r;
 221
 222         assert(s);
 223
 224         if (!s->bind_to_device)
 225                 return 0;
 226
 227         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 228                 return -ENOMEM;
 229
 230         r = unit_add_node_link(UNIT(s), t, false);
 231         free(t);
 232
 233         return r;
 234 }
 235
 236 static int socket_load(Unit *u) {
 237         Socket *s = SOCKET(u);
 238         int r;
 239
 240         assert(u);
 241         assert(u->meta.load_state == UNIT_STUB);
 242
 243         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 244                 return r;
 245
 246         /* This is a new unit? Then let's add in some extras */
 247         if (u->meta.load_state == UNIT_LOADED) {
 248
 249                 if (have_non_accept_socket(s)) {
 250                         if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)))
 251                                 return r;
 252
 253                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 254                                 return r;
 255                 }
 256
 257                 if ((r = socket_add_mount_links(s)) < 0)
 258                         return r;
 259
 260                 if ((r = socket_add_device_link(s)) < 0)
 261                         return r;
 262
 263                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 264                         return r;
 265
 266                 if ((r = unit_add_default_cgroup(u)) < 0)
 267                         return r;
 268         }
 269
 270         return socket_verify(s);
 271 }
 272
 273 static const char* listen_lookup(int type) {
 274
 275         if (type == SOCK_STREAM)
 276                 return "ListenStream";
 277         else if (type == SOCK_DGRAM)
 278                 return "ListenDatagram";
 279         else if (type == SOCK_SEQPACKET)
 280                 return "ListenSequentialPacket";
 281
 282         assert_not_reached("Unknown socket type");
 283         return NULL;
 284 }
 285
 286 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 287
 288         SocketExecCommand c;
 289         Socket *s = SOCKET(u);
 290         SocketPort *p;
 291         const char *prefix2;
 292         char *p2;
 293
 294         assert(s);
 295         assert(f);
 296
 297         p2 = strappend(prefix, "\t");
 298         prefix2 = p2 ? p2 : prefix;
 299
 300         fprintf(f,
 301                 "%sSocket State: %s\n"
 302                 "%sBindIPv6Only: %s\n"
 303                 "%sBacklog: %u\n"
 304                 "%sKillMode: %s\n"
 305                 "%sSocketMode: %04o\n"
 306                 "%sDirectoryMode: %04o\n",
 307                 prefix, socket_state_to_string(s->state),
 308                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 309                 prefix, s->backlog,
 310                 prefix, kill_mode_to_string(s->kill_mode),
 311                 prefix, s->socket_mode,
 312                 prefix, s->directory_mode);
 313
 314         if (s->control_pid > 0)
 315                 fprintf(f,
 316                         "%sControl PID: %lu\n",
 317                         prefix, (unsigned long) s->control_pid);
 318
 319         if (s->bind_to_device)
 320                 fprintf(f,
 321                         "%sBindToDevice: %s\n",
 322                         prefix, s->bind_to_device);
 323
 324         if (s->accept)
 325                 fprintf(f,
 326                         "%sAccepted: %u\n"
 327                         "%sNConnections: %u\n"
 328                         "%sMaxConnections: %u\n",
 329                         prefix, s->n_accepted,
 330                         prefix, s->n_connections,
 331                         prefix, s->max_connections);
 332
 333         LIST_FOREACH(port, p, s->ports) {
 334
 335                 if (p->type == SOCKET_SOCKET) {
 336                         const char *t;
 337                         int r;
 338                         char *k;
 339
 340                         if ((r = socket_address_print(&p->address, &k)) < 0)
 341                                 t = strerror(-r);
 342                         else
 343                                 t = k;
 344
 345                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 346                         free(k);
 347                 } else
 348                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 349         }
 350
 351         exec_context_dump(&s->exec_context, f, prefix);
 352
 353         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 354                 if (!s->exec_command[c])
 355                         continue;
 356
 357                 fprintf(f, "%s-> %s:\n",
 358                         prefix, socket_exec_command_to_string(c));
 359
 360                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 361         }
 362
 363         free(p2);
 364 }
 365
 366 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 367         socklen_t l;
 368         char *r;
 369         union {
 370                 struct sockaddr sa;
 371                 struct sockaddr_un un;
 372                 struct sockaddr_in in;
 373                 struct sockaddr_in6 in6;
 374                 struct sockaddr_storage storage;
 375         } local, remote;
 376
 377         assert(fd >= 0);
 378         assert(instance);
 379
 380         l = sizeof(local);
 381         if (getsockname(fd, &local.sa, &l) < 0)
 382                 return -errno;
 383
 384         l = sizeof(remote);
 385         if (getpeername(fd, &remote.sa, &l) < 0)
 386                 return -errno;
 387
 388         switch (local.sa.sa_family) {
 389
 390         case AF_INET: {
 391                 uint32_t
 392                         a = ntohl(local.in.sin_addr.s_addr),
 393                         b = ntohl(remote.in.sin_addr.s_addr);
 394
 395                 if (asprintf(&r,
 396                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 397                              nr,
 398                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 399                              ntohs(local.in.sin_port),
 400                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 401                              ntohs(remote.in.sin_port)) < 0)
 402                         return -ENOMEM;
 403
 404                 break;
 405         }
 406
 407         case AF_INET6: {
 408                 static const char ipv4_prefix[] = {
 409                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 410                 };
 411
 412                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 413                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 414                         const uint8_t
 415                                 *a = local.in6.sin6_addr.s6_addr+12,
 416                                 *b = remote.in6.sin6_addr.s6_addr+12;
 417
 418                         if (asprintf(&r,
 419                                      "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 420                                      nr,
 421                                      a[0], a[1], a[2], a[3],
 422                                      ntohs(local.in6.sin6_port),
 423                                      b[0], b[1], b[2], b[3],
 424                                      ntohs(remote.in6.sin6_port)) < 0)
 425                                 return -ENOMEM;
 426                 } else {
 427                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 428
 429                         if (asprintf(&r,
 430                                      "%u-%s:%u-%s:%u",
 431                                      nr,
 432                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 433                                      ntohs(local.in6.sin6_port),
 434                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 435                                      ntohs(remote.in6.sin6_port)) < 0)
 436                                 return -ENOMEM;
 437                 }
 438
 439                 break;
 440         }
 441
 442         case AF_UNIX: {
 443                 struct ucred ucred;
 444
 445                 l = sizeof(ucred);
 446                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 447                         return -errno;
 448
 449                 if (asprintf(&r,
 450                              "%u-%lu-%lu",
 451                              nr,
 452                              (unsigned long) ucred.pid,
 453                              (unsigned long) ucred.uid) < 0)
 454                         return -ENOMEM;
 455
 456                 break;
 457         }
 458
 459         default:
 460                 assert_not_reached("Unhandled socket type.");
 461         }
 462
 463         *instance = r;
 464         return 0;
 465 }
 466
 467 static void socket_close_fds(Socket *s) {
 468         SocketPort *p;
 469
 470         assert(s);
 471
 472         LIST_FOREACH(port, p, s->ports) {
 473                 if (p->fd < 0)
 474                         continue;
 475
 476                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 477                 close_nointr_nofail(p->fd);
 478
 479                 /* One little note: we should never delete any sockets
 480                  * in the file system here! After all some other
 481                  * process we spawned might still have a reference of
 482                  * this fd and wants to continue to use it. Therefore
 483                  * we delete sockets in the file system before we
 484                  * create a new one, not after we stopped using
 485                  * one! */
 486
 487                 p->fd = -1;
 488         }
 489 }
 490
 491 static int socket_open_fds(Socket *s) {
 492         SocketPort *p;
 493         int r;
 494
 495         assert(s);
 496
 497         LIST_FOREACH(port, p, s->ports) {
 498
 499                 if (p->fd >= 0)
 500                         continue;
 501
 502                 if (p->type == SOCKET_SOCKET) {
 503
 504                         if ((r = socket_address_listen(
 505                                              &p->address,
 506                                              s->backlog,
 507                                              s->bind_ipv6_only,
 508                                              s->bind_to_device,
 509                                              s->directory_mode,
 510                                              s->socket_mode,
 511                                              &p->fd)) < 0)
 512                                 goto rollback;
 513
 514                 } else {
 515                         struct stat st;
 516                         assert(p->type == SOCKET_FIFO);
 517
 518                         mkdir_parents(p->path, s->directory_mode);
 519
 520                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 521                                 r = -errno;
 522                                 goto rollback;
 523                         }
 524
 525                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 526                                 r = -errno;
 527                                 goto rollback;
 528                         }
 529
 530                         if (fstat(p->fd, &st) < 0) {
 531                                 r = -errno;
 532                                 goto rollback;
 533                         }
 534
 535                         /* FIXME verify user, access mode */
 536
 537                         if (!S_ISFIFO(st.st_mode)) {
 538                                 r = -EEXIST;
 539                                 goto rollback;
 540                         }
 541                 }
 542         }
 543
 544         return 0;
 545
 546 rollback:
 547         socket_close_fds(s);
 548         return r;
 549 }
 550
 551 static void socket_unwatch_fds(Socket *s) {
 552         SocketPort *p;
 553
 554         assert(s);
 555
 556         LIST_FOREACH(port, p, s->ports) {
 557                 if (p->fd < 0)
 558                         continue;
 559
 560                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 561         }
 562 }
 563
 564 static int socket_watch_fds(Socket *s) {
 565         SocketPort *p;
 566         int r;
 567
 568         assert(s);
 569
 570         LIST_FOREACH(port, p, s->ports) {
 571                 if (p->fd < 0)
 572                         continue;
 573
 574                 p->fd_watch.socket_accept =
 575                         s->accept &&
 576                         p->type == SOCKET_SOCKET &&
 577                         socket_address_can_accept(&p->address);
 578
 579                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 580                         goto fail;
 581         }
 582
 583         return 0;
 584
 585 fail:
 586         socket_unwatch_fds(s);
 587         return r;
 588 }
 589
 590 static void socket_set_state(Socket *s, SocketState state) {
 591         SocketState old_state;
 592         assert(s);
 593
 594         old_state = s->state;
 595         s->state = state;
 596
 597         if (state != SOCKET_START_PRE &&
 598             state != SOCKET_START_POST &&
 599             state != SOCKET_STOP_PRE &&
 600             state != SOCKET_STOP_PRE_SIGTERM &&
 601             state != SOCKET_STOP_PRE_SIGKILL &&
 602             state != SOCKET_STOP_POST &&
 603             state != SOCKET_FINAL_SIGTERM &&
 604             state != SOCKET_FINAL_SIGKILL) {
 605                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 606                 socket_unwatch_control_pid(s);
 607                 s->control_command = NULL;
 608                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 609         }
 610
 611         if (state != SOCKET_LISTENING)
 612                 socket_unwatch_fds(s);
 613
 614         if (state != SOCKET_START_POST &&
 615             state != SOCKET_LISTENING &&
 616             state != SOCKET_RUNNING &&
 617             state != SOCKET_STOP_PRE &&
 618             state != SOCKET_STOP_PRE_SIGTERM &&
 619             state != SOCKET_STOP_PRE_SIGKILL)
 620                 socket_close_fds(s);
 621
 622         if (state != old_state)
 623                 log_debug("%s changed %s -> %s",
 624                           s->meta.id,
 625                           socket_state_to_string(old_state),
 626                           socket_state_to_string(state));
 627
 628         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 629 }
 630
 631 static int socket_coldplug(Unit *u) {
 632         Socket *s = SOCKET(u);
 633         int r;
 634
 635         assert(s);
 636         assert(s->state == SOCKET_DEAD);
 637
 638         if (s->deserialized_state != s->state) {
 639
 640                 if (s->deserialized_state == SOCKET_START_PRE ||
 641                     s->deserialized_state == SOCKET_START_POST ||
 642                     s->deserialized_state == SOCKET_STOP_PRE ||
 643                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 644                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 645                     s->deserialized_state == SOCKET_STOP_POST ||
 646                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 647                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 648
 649                         if (s->control_pid <= 0)
 650                                 return -EBADMSG;
 651
 652                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 653                                 return r;
 654
 655                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 656                                 return r;
 657                 }
 658
 659                 if (s->deserialized_state == SOCKET_START_POST ||
 660                     s->deserialized_state == SOCKET_LISTENING ||
 661                     s->deserialized_state == SOCKET_RUNNING ||
 662                     s->deserialized_state == SOCKET_STOP_PRE ||
 663                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 664                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 665                         if ((r = socket_open_fds(s)) < 0)
 666                                 return r;
 667
 668                 if (s->deserialized_state == SOCKET_LISTENING)
 669                         if ((r = socket_watch_fds(s)) < 0)
 670                                 return r;
 671
 672                 socket_set_state(s, s->deserialized_state);
 673         }
 674
 675         return 0;
 676 }
 677
 678 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 679         pid_t pid;
 680         int r;
 681         char **argv;
 682
 683         assert(s);
 684         assert(c);
 685         assert(_pid);
 686
 687         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 688                 goto fail;
 689
 690         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 691                 r = -ENOMEM;
 692                 goto fail;
 693         }
 694
 695         r = exec_spawn(c,
 696                        argv,
 697                        &s->exec_context,
 698                        NULL, 0,
 699                        s->meta.manager->environment,
 700                        true,
 701                        true,
 702                        s->meta.manager->confirm_spawn,
 703                        s->meta.cgroup_bondings,
 704                        &pid);
 705
 706         strv_free(argv);
 707         if (r < 0)
 708                 goto fail;
 709
 710         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 711                 /* FIXME: we need to do something here */
 712                 goto fail;
 713
 714         *_pid = pid;
 715
 716         return 0;
 717
 718 fail:
 719         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 720
 721         return r;
 722 }
 723
 724 static void socket_enter_dead(Socket *s, bool success) {
 725         assert(s);
 726
 727         if (!success)
 728                 s->failure = true;
 729
 730         socket_set_state(s, s->failure ? SOCKET_MAINTENANCE : SOCKET_DEAD);
 731 }
 732
 733 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 734
 735 static void socket_enter_stop_post(Socket *s, bool success) {
 736         int r;
 737         assert(s);
 738
 739         if (!success)
 740                 s->failure = true;
 741
 742         socket_unwatch_control_pid(s);
 743
 744         s->control_command_id = SOCKET_EXEC_STOP_POST;
 745
 746         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 747                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 748                         goto fail;
 749
 750                 socket_set_state(s, SOCKET_STOP_POST);
 751         } else
 752                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
 753
 754         return;
 755
 756 fail:
 757         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
 758         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 759 }
 760
 761 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 762         int r;
 763         bool sent = false;
 764
 765         assert(s);
 766
 767         if (!success)
 768                 s->failure = true;
 769
 770         if (s->kill_mode != KILL_NONE) {
 771                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
 772
 773                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 774
 775                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
 776                                 if (r != -EAGAIN && r != -ESRCH)
 777                                         goto fail;
 778                         } else
 779                                 sent = true;
 780                 }
 781
 782                 if (!sent && s->control_pid > 0)
 783                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 784                                 r = -errno;
 785                                 goto fail;
 786                         }
 787         }
 788
 789         if (sent && s->control_pid > 0) {
 790                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 791                         goto fail;
 792
 793                 socket_set_state(s, state);
 794         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 795                 socket_enter_stop_post(s, true);
 796         else
 797                 socket_enter_dead(s, true);
 798
 799         return;
 800
 801 fail:
 802         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
 803
 804         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 805                 socket_enter_stop_post(s, false);
 806         else
 807                 socket_enter_dead(s, false);
 808 }
 809
 810 static void socket_enter_stop_pre(Socket *s, bool success) {
 811         int r;
 812         assert(s);
 813
 814         if (!success)
 815                 s->failure = true;
 816
 817         socket_unwatch_control_pid(s);
 818
 819         s->control_command_id = SOCKET_EXEC_STOP_PRE;
 820
 821         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
 822                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 823                         goto fail;
 824
 825                 socket_set_state(s, SOCKET_STOP_PRE);
 826         } else
 827                 socket_enter_stop_post(s, true);
 828
 829         return;
 830
 831 fail:
 832         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
 833         socket_enter_stop_post(s, false);
 834 }
 835
 836 static void socket_enter_listening(Socket *s) {
 837         int r;
 838         assert(s);
 839
 840         if ((r = socket_watch_fds(s)) < 0) {
 841                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
 842                 goto fail;
 843         }
 844
 845         socket_set_state(s, SOCKET_LISTENING);
 846         return;
 847
 848 fail:
 849         socket_enter_stop_pre(s, false);
 850 }
 851
 852 static void socket_enter_start_post(Socket *s) {
 853         int r;
 854         assert(s);
 855
 856         if ((r = socket_open_fds(s)) < 0) {
 857                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
 858                 goto fail;
 859         }
 860
 861         socket_unwatch_control_pid(s);
 862
 863         s->control_command_id = SOCKET_EXEC_START_POST;
 864
 865         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
 866                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
 867                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
 868                         goto fail;
 869                 }
 870
 871                 socket_set_state(s, SOCKET_START_POST);
 872         } else
 873                 socket_enter_listening(s);
 874
 875         return;
 876
 877 fail:
 878         socket_enter_stop_pre(s, false);
 879 }
 880
 881 static void socket_enter_start_pre(Socket *s) {
 882         int r;
 883         assert(s);
 884
 885         socket_unwatch_control_pid(s);
 886
 887         s->control_command_id = SOCKET_EXEC_START_PRE;
 888
 889         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
 890                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 891                         goto fail;
 892
 893                 socket_set_state(s, SOCKET_START_PRE);
 894         } else
 895                 socket_enter_start_post(s);
 896
 897         return;
 898
 899 fail:
 900         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
 901         socket_enter_dead(s, false);
 902 }
 903
 904 static void socket_enter_running(Socket *s, int cfd) {
 905         int r;
 906
 907         assert(s);
 908
 909         if (cfd < 0) {
 910                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 911                         goto fail;
 912
 913                 socket_set_state(s, SOCKET_RUNNING);
 914         } else {
 915                 Unit *u;
 916                 char *prefix, *instance, *name;
 917
 918                 if (s->n_connections >= s->max_connections) {
 919                         log_warning("Too many incoming connections (%u)", s->n_connections);
 920                         close_nointr_nofail(cfd);
 921                         return;
 922                 }
 923
 924                 if ((r = instance_from_socket(cfd, s->n_accepted++, &instance)) < 0)
 925                         goto fail;
 926
 927                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
 928                         free(instance);
 929                         r = -ENOMEM;
 930                         goto fail;
 931                 }
 932
 933                 name = unit_name_build(prefix, instance, ".service");
 934                 free(prefix);
 935                 free(instance);
 936
 937                 if (!name) {
 938                         r = -ENOMEM;
 939                         goto fail;
 940                 }
 941
 942                 r = manager_load_unit(s->meta.manager, name, NULL, &u);
 943                 free(name);
 944
 945                 if (r < 0)
 946                         goto fail;
 947
 948                 if ((r = service_set_socket_fd(SERVICE(u), cfd, s)) < 0)
 949                         goto fail;
 950
 951                 cfd = -1;
 952
 953                 s->n_connections ++;
 954
 955                 if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, NULL)) < 0)
 956                         goto fail;
 957         }
 958
 959         return;
 960
 961 fail:
 962         log_warning("%s failed to queue socket startup job: %s", s->meta.id, strerror(-r));
 963         socket_enter_stop_pre(s, false);
 964
 965         if (cfd >= 0)
 966                 close_nointr_nofail(cfd);
 967 }
 968
 969 static void socket_run_next(Socket *s, bool success) {
 970         int r;
 971
 972         assert(s);
 973         assert(s->control_command);
 974         assert(s->control_command->command_next);
 975
 976         if (!success)
 977                 s->failure = true;
 978
 979         socket_unwatch_control_pid(s);
 980
 981         s->control_command = s->control_command->command_next;
 982
 983         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 984                 goto fail;
 985
 986         return;
 987
 988 fail:
 989         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
 990
 991         if (s->state == SOCKET_START_POST)
 992                 socket_enter_stop_pre(s, false);
 993         else if (s->state == SOCKET_STOP_POST)
 994                 socket_enter_dead(s, false);
 995         else
 996                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 997 }
 998
 999 static int socket_start(Unit *u) {
1000         Socket *s = SOCKET(u);
1001
1002         assert(s);
1003
1004         /* We cannot fulfill this request right now, try again later
1005          * please! */
1006         if (s->state == SOCKET_STOP_PRE ||
1007             s->state == SOCKET_STOP_PRE_SIGKILL ||
1008             s->state == SOCKET_STOP_PRE_SIGTERM ||
1009             s->state == SOCKET_STOP_POST ||
1010             s->state == SOCKET_FINAL_SIGTERM ||
1011             s->state == SOCKET_FINAL_SIGKILL)
1012                 return -EAGAIN;
1013
1014         if (s->state == SOCKET_START_PRE ||
1015             s->state == SOCKET_START_POST)
1016                 return 0;
1017
1018         /* Cannot run this without the service being around */
1019         if (s->service) {
1020                 if (s->service->meta.load_state != UNIT_LOADED)
1021                         return -ENOENT;
1022
1023                 /* If the service is alredy actvie we cannot start the
1024                  * socket */
1025                 if (s->service->state != SERVICE_DEAD &&
1026                     s->service->state != SERVICE_MAINTENANCE &&
1027                     s->service->state != SERVICE_AUTO_RESTART)
1028                         return -EBUSY;
1029         }
1030
1031         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTENANCE);
1032
1033         s->failure = false;
1034         socket_enter_start_pre(s);
1035         return 0;
1036 }
1037
1038 static int socket_stop(Unit *u) {
1039         Socket *s = SOCKET(u);
1040
1041         assert(s);
1042
1043         /* We cannot fulfill this request right now, try again later
1044          * please! */
1045         if (s->state == SOCKET_START_PRE ||
1046             s->state == SOCKET_START_POST)
1047                 return -EAGAIN;
1048
1049         /* Already on it */
1050         if (s->state == SOCKET_STOP_PRE ||
1051             s->state == SOCKET_STOP_PRE_SIGTERM ||
1052             s->state == SOCKET_STOP_PRE_SIGKILL ||
1053             s->state == SOCKET_STOP_POST ||
1054             s->state == SOCKET_FINAL_SIGTERM ||
1055             s->state == SOCKET_FINAL_SIGTERM)
1056                 return 0;
1057
1058         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1059
1060         socket_enter_stop_pre(s, true);
1061         return 0;
1062 }
1063
1064 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1065         Socket *s = SOCKET(u);
1066         SocketPort *p;
1067         int r;
1068
1069         assert(u);
1070         assert(f);
1071         assert(fds);
1072
1073         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1074         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1075         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1076
1077         if (s->control_pid > 0)
1078                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1079
1080         if (s->control_command_id >= 0)
1081                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1082
1083         LIST_FOREACH(port, p, s->ports) {
1084                 int copy;
1085
1086                 if (p->fd < 0)
1087                         continue;
1088
1089                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1090                         return copy;
1091
1092                 if (p->type == SOCKET_SOCKET) {
1093                         char *t;
1094
1095                         if ((r = socket_address_print(&p->address, &t)) < 0)
1096                                 return r;
1097
1098                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1099                         free(t);
1100                 } else {
1101                         assert(p->type == SOCKET_FIFO);
1102                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1103                 }
1104         }
1105
1106         return 0;
1107 }
1108
1109 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1110         Socket *s = SOCKET(u);
1111         int r;
1112
1113         assert(u);
1114         assert(key);
1115         assert(value);
1116         assert(fds);
1117
1118         if (streq(key, "state")) {
1119                 SocketState state;
1120
1121                 if ((state = socket_state_from_string(value)) < 0)
1122                         log_debug("Failed to parse state value %s", value);
1123                 else
1124                         s->deserialized_state = state;
1125         } else if (streq(key, "failure")) {
1126                 int b;
1127
1128                 if ((b = parse_boolean(value)) < 0)
1129                         log_debug("Failed to parse failure value %s", value);
1130                 else
1131                         s->failure = b || s->failure;
1132
1133         } else if (streq(key, "n-accepted")) {
1134                 unsigned k;
1135
1136                 if ((r = safe_atou(value, &k)) < 0)
1137                         log_debug("Failed to parse n-accepted value %s", value);
1138                 else
1139                         s->n_accepted += k;
1140         } else if (streq(key, "control-pid")) {
1141                 pid_t pid;
1142
1143                 if ((r = parse_pid(value, &pid)) < 0)
1144                         log_debug("Failed to parse control-pid value %s", value);
1145                 else
1146                         s->control_pid = pid;
1147         } else if (streq(key, "control-command")) {
1148                 SocketExecCommand id;
1149
1150                 if ((id = socket_exec_command_from_string(value)) < 0)
1151                         log_debug("Failed to parse exec-command value %s", value);
1152                 else {
1153                         s->control_command_id = id;
1154                         s->control_command = s->exec_command[id];
1155                 }
1156         } else if (streq(key, "fifo")) {
1157                 int fd, skip = 0;
1158                 SocketPort *p;
1159
1160                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1161                         log_debug("Failed to parse fifo value %s", value);
1162                 else {
1163
1164                         LIST_FOREACH(port, p, s->ports)
1165                                 if (streq(p->path, value+skip))
1166                                         break;
1167
1168                         if (p) {
1169                                 if (p->fd >= 0)
1170                                         close_nointr_nofail(p->fd);
1171                                 p->fd = fdset_remove(fds, fd);
1172                         }
1173                 }
1174
1175         } else if (streq(key, "socket")) {
1176                 int fd, type, skip = 0;
1177                 SocketPort *p;
1178
1179                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1180                         log_debug("Failed to parse socket value %s", value);
1181                 else {
1182
1183                         LIST_FOREACH(port, p, s->ports)
1184                                 if (socket_address_is(&p->address, value+skip, type))
1185                                         break;
1186
1187                         if (p) {
1188                                 if (p->fd >= 0)
1189                                         close_nointr_nofail(p->fd);
1190                                 p->fd = fdset_remove(fds, fd);
1191                         }
1192                 }
1193
1194         } else
1195                 log_debug("Unknown serialization key '%s'", key);
1196
1197         return 0;
1198 }
1199
1200 static UnitActiveState socket_active_state(Unit *u) {
1201         assert(u);
1202
1203         return state_translation_table[SOCKET(u)->state];
1204 }
1205
1206 static const char *socket_sub_state_to_string(Unit *u) {
1207         assert(u);
1208
1209         return socket_state_to_string(SOCKET(u)->state);
1210 }
1211
1212 static bool socket_check_gc(Unit *u) {
1213         Socket *s = SOCKET(u);
1214
1215         assert(u);
1216
1217         return s->n_connections > 0;
1218 }
1219
1220 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1221         Socket *s = SOCKET(u);
1222         int cfd = -1;
1223
1224         assert(s);
1225         assert(fd >= 0);
1226
1227         if (s->state != SOCKET_LISTENING)
1228                 return;
1229
1230         log_debug("Incoming traffic on %s", u->meta.id);
1231
1232         if (events != EPOLLIN) {
1233                 log_error("Got invalid poll event on socket.");
1234                 goto fail;
1235         }
1236
1237         if (w->socket_accept) {
1238                 for (;;) {
1239
1240                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1241
1242                                 if (errno == EINTR)
1243                                         continue;
1244
1245                                 log_error("Failed to accept socket: %m");
1246                                 goto fail;
1247                         }
1248
1249                         break;
1250                 }
1251         }
1252
1253         socket_enter_running(s, cfd);
1254         return;
1255
1256 fail:
1257         socket_enter_stop_pre(s, false);
1258 }
1259
1260 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1261         Socket *s = SOCKET(u);
1262         bool success;
1263
1264         assert(s);
1265         assert(pid >= 0);
1266
1267         if (pid != s->control_pid)
1268                 return;
1269
1270         s->control_pid = 0;
1271
1272         success = is_clean_exit(code, status);
1273         s->failure = s->failure || !success;
1274
1275         if (s->control_command)
1276                 exec_status_fill(&s->control_command->exec_status, pid, code, status);
1277
1278         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1279
1280         if (s->control_command && s->control_command->command_next && success) {
1281                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1282                 socket_run_next(s, success);
1283         } else {
1284                 s->control_command = NULL;
1285                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1286
1287                 /* No further commands for this step, so let's figure
1288                  * out what to do next */
1289
1290                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1291
1292                 switch (s->state) {
1293
1294                 case SOCKET_START_PRE:
1295                         if (success)
1296                                 socket_enter_start_post(s);
1297                         else
1298                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1299                         break;
1300
1301                 case SOCKET_START_POST:
1302                         if (success)
1303                                 socket_enter_listening(s);
1304                         else
1305                                 socket_enter_stop_pre(s, false);
1306                         break;
1307
1308                 case SOCKET_STOP_PRE:
1309                 case SOCKET_STOP_PRE_SIGTERM:
1310                 case SOCKET_STOP_PRE_SIGKILL:
1311                         socket_enter_stop_post(s, success);
1312                         break;
1313
1314                 case SOCKET_STOP_POST:
1315                 case SOCKET_FINAL_SIGTERM:
1316                 case SOCKET_FINAL_SIGKILL:
1317                         socket_enter_dead(s, success);
1318                         break;
1319
1320                 default:
1321                         assert_not_reached("Uh, control process died at wrong time.");
1322                 }
1323         }
1324 }
1325
1326 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1327         Socket *s = SOCKET(u);
1328
1329         assert(s);
1330         assert(elapsed == 1);
1331         assert(w == &s->timer_watch);
1332
1333         switch (s->state) {
1334
1335         case SOCKET_START_PRE:
1336                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1337                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1338
1339         case SOCKET_START_POST:
1340                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1341                 socket_enter_stop_pre(s, false);
1342                 break;
1343
1344         case SOCKET_STOP_PRE:
1345                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1346                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1347                 break;
1348
1349         case SOCKET_STOP_PRE_SIGTERM:
1350                 log_warning("%s stopping timed out. Killing.", u->meta.id);
1351                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1352                 break;
1353
1354         case SOCKET_STOP_PRE_SIGKILL:
1355                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1356                 socket_enter_stop_post(s, false);
1357                 break;
1358
1359         case SOCKET_STOP_POST:
1360                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1361                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1362                 break;
1363
1364         case SOCKET_FINAL_SIGTERM:
1365                 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1366                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1367                 break;
1368
1369         case SOCKET_FINAL_SIGKILL:
1370                 log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
1371                 socket_enter_dead(s, false);
1372                 break;
1373
1374         default:
1375                 assert_not_reached("Timeout at wrong time.");
1376         }
1377 }
1378
1379 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1380         int *rfds;
1381         unsigned rn_fds, k;
1382         SocketPort *p;
1383
1384         assert(s);
1385         assert(fds);
1386         assert(n_fds);
1387
1388         /* Called from the service code for requesting our fds */
1389
1390         rn_fds = 0;
1391         LIST_FOREACH(port, p, s->ports)
1392                 if (p->fd >= 0)
1393                         rn_fds++;
1394
1395         if (!(rfds = new(int, rn_fds)) < 0)
1396                 return -ENOMEM;
1397
1398         k = 0;
1399         LIST_FOREACH(port, p, s->ports)
1400                 if (p->fd >= 0)
1401                         rfds[k++] = p->fd;
1402
1403         assert(k == rn_fds);
1404
1405         *fds = rfds;
1406         *n_fds = rn_fds;
1407
1408         return 0;
1409 }
1410
1411 void socket_notify_service_dead(Socket *s) {
1412         assert(s);
1413
1414         /* The service is dead. Dang!
1415          *
1416          * This is strictly for one-instance-for-all-connections
1417          * services. */
1418
1419         if (s->state == SOCKET_RUNNING) {
1420                 log_debug("%s got notified about service death.", s->meta.id);
1421                 socket_enter_listening(s);
1422         }
1423 }
1424
1425 void socket_connection_unref(Socket *s) {
1426         assert(s);
1427
1428         /* The service is dead. Yay!
1429          *
1430          * This is strictly for one-onstance-per-connection
1431          * services. */
1432
1433         assert(s->n_connections > 0);
1434         s->n_connections--;
1435
1436         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1437 }
1438
1439 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1440         [SOCKET_DEAD] = "dead",
1441         [SOCKET_START_PRE] = "start-pre",
1442         [SOCKET_START_POST] = "start-post",
1443         [SOCKET_LISTENING] = "listening",
1444         [SOCKET_RUNNING] = "running",
1445         [SOCKET_STOP_PRE] = "stop-pre",
1446         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1447         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1448         [SOCKET_STOP_POST] = "stop-post",
1449         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1450         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1451         [SOCKET_MAINTENANCE] = "maintenance"
1452 };
1453
1454 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1455
1456 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1457         [SOCKET_EXEC_START_PRE] = "StartPre",
1458         [SOCKET_EXEC_START_POST] = "StartPost",
1459         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1460         [SOCKET_EXEC_STOP_POST] = "StopPost"
1461 };
1462
1463 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1464
1465 const UnitVTable socket_vtable = {
1466         .suffix = ".socket",
1467
1468         .init = socket_init,
1469         .done = socket_done,
1470         .load = socket_load,
1471
1472         .coldplug = socket_coldplug,
1473
1474         .dump = socket_dump,
1475
1476         .start = socket_start,
1477         .stop = socket_stop,
1478
1479         .serialize = socket_serialize,
1480         .deserialize_item = socket_deserialize_item,
1481
1482         .active_state = socket_active_state,
1483         .sub_state_to_string = socket_sub_state_to_string,
1484
1485         .check_gc = socket_check_gc,
1486
1487         .fd_event = socket_fd_event,
1488         .sigchld_event = socket_sigchld_event,
1489         .timer_event = socket_timer_event,
1490
1491         .bus_message_handler = bus_socket_message_handler
1492 };