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