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