src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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 #include <mqueue.h>
  31
  32 #include "unit.h"
  33 #include "socket.h"
  34 #include "netinet/tcp.h"
  35 #include "log.h"
  36 #include "load-dropin.h"
  37 #include "load-fragment.h"
  38 #include "strv.h"
  39 #include "unit-name.h"
  40 #include "dbus-socket.h"
  41 #include "missing.h"
  42 #include "special.h"
  43 #include "bus-errors.h"
  44 #include "label.h"
  45 #include "exit-status.h"
  46 #include "def.h"
  47
  48 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  49         [SOCKET_DEAD] = UNIT_INACTIVE,
  50         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  51         [SOCKET_START_POST] = UNIT_ACTIVATING,
  52         [SOCKET_LISTENING] = UNIT_ACTIVE,
  53         [SOCKET_RUNNING] = UNIT_ACTIVE,
  54         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  55         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  56         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  57         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  58         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  59         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  60         [SOCKET_FAILED] = UNIT_FAILED
  61 };
  62
  63 static void socket_init(Unit *u) {
  64         Socket *s = SOCKET(u);
  65
  66         assert(u);
  67         assert(u->load_state == UNIT_STUB);
  68
  69         s->backlog = SOMAXCONN;
  70         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  71         s->directory_mode = 0755;
  72         s->socket_mode = 0666;
  73
  74         s->max_connections = 64;
  75
  76         s->priority = -1;
  77         s->ip_tos = -1;
  78         s->ip_ttl = -1;
  79         s->mark = -1;
  80
  81         exec_context_init(&s->exec_context);
  82         s->exec_context.std_output = u->manager->default_std_output;
  83         s->exec_context.std_error = u->manager->default_std_error;
  84
  85         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  86 }
  87
  88 static void socket_unwatch_control_pid(Socket *s) {
  89         assert(s);
  90
  91         if (s->control_pid <= 0)
  92                 return;
  93
  94         unit_unwatch_pid(UNIT(s), s->control_pid);
  95         s->control_pid = 0;
  96 }
  97
  98 static void socket_done(Unit *u) {
  99         Socket *s = SOCKET(u);
 100         SocketPort *p;
 101
 102         assert(s);
 103
 104         while ((p = s->ports)) {
 105                 LIST_REMOVE(SocketPort, port, s->ports, p);
 106
 107                 if (p->fd >= 0) {
 108                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 109                         close_nointr_nofail(p->fd);
 110                 }
 111
 112                 free(p->path);
 113                 free(p);
 114         }
 115
 116         exec_context_done(&s->exec_context);
 117         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 118         s->control_command = NULL;
 119
 120         socket_unwatch_control_pid(s);
 121
 122         unit_ref_unset(&s->service);
 123
 124         free(s->tcp_congestion);
 125         s->tcp_congestion = NULL;
 126
 127         free(s->bind_to_device);
 128         s->bind_to_device = NULL;
 129
 130         unit_unwatch_timer(u, &s->timer_watch);
 131 }
 132
 133 static int socket_instantiate_service(Socket *s) {
 134         char *prefix, *name;
 135         int r;
 136         Unit *u;
 137
 138         assert(s);
 139
 140         /* This fills in s->service if it isn't filled in yet. For
 141          * Accept=yes sockets we create the next connection service
 142          * here. For Accept=no this is mostly a NOP since the service
 143          * is figured out at load time anyway. */
 144
 145         if (UNIT_DEREF(s->service))
 146                 return 0;
 147
 148         assert(s->accept);
 149
 150         if (!(prefix = unit_name_to_prefix(UNIT(s)->id)))
 151                 return -ENOMEM;
 152
 153         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 154         free(prefix);
 155
 156         if (r < 0)
 157                 return -ENOMEM;
 158
 159         r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
 160         free(name);
 161
 162         if (r < 0)
 163                 return r;
 164
 165 #ifdef HAVE_SYSV_COMPAT
 166         if (SERVICE(u)->sysv_path) {
 167                 log_error("Using SysV services for socket activation is not supported. Refusing.");
 168                 return -ENOENT;
 169         }
 170 #endif
 171
 172         u->no_gc = true;
 173         unit_ref_set(&s->service, u);
 174
 175         return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
 176 }
 177
 178 static bool have_non_accept_socket(Socket *s) {
 179         SocketPort *p;
 180
 181         assert(s);
 182
 183         if (!s->accept)
 184                 return true;
 185
 186         LIST_FOREACH(port, p, s->ports) {
 187
 188                 if (p->type != SOCKET_SOCKET)
 189                         return true;
 190
 191                 if (!socket_address_can_accept(&p->address))
 192                         return true;
 193         }
 194
 195         return false;
 196 }
 197
 198 static int socket_verify(Socket *s) {
 199         assert(s);
 200
 201         if (UNIT(s)->load_state != UNIT_LOADED)
 202                 return 0;
 203
 204         if (!s->ports) {
 205                 log_error("%s lacks Listen setting. Refusing.", UNIT(s)->id);
 206                 return -EINVAL;
 207         }
 208
 209         if (s->accept && have_non_accept_socket(s)) {
 210                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", UNIT(s)->id);
 211                 return -EINVAL;
 212         }
 213
 214         if (s->accept && s->max_connections <= 0) {
 215                 log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->id);
 216                 return -EINVAL;
 217         }
 218
 219         if (s->accept && UNIT_DEREF(s->service)) {
 220                 log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", UNIT(s)->id);
 221                 return -EINVAL;
 222         }
 223
 224         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 225                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id);
 226                 return -EINVAL;
 227         }
 228
 229         return 0;
 230 }
 231
 232 static bool socket_needs_mount(Socket *s, const char *prefix) {
 233         SocketPort *p;
 234
 235         assert(s);
 236
 237         LIST_FOREACH(port, p, s->ports) {
 238
 239                 if (p->type == SOCKET_SOCKET) {
 240                         if (socket_address_needs_mount(&p->address, prefix))
 241                                 return true;
 242                 } else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL) {
 243                         if (path_startswith(p->path, prefix))
 244                                 return true;
 245                 }
 246         }
 247
 248         return false;
 249 }
 250
 251 int socket_add_one_mount_link(Socket *s, Mount *m) {
 252         int r;
 253
 254         assert(s);
 255         assert(m);
 256
 257         if (UNIT(s)->load_state != UNIT_LOADED ||
 258             UNIT(m)->load_state != UNIT_LOADED)
 259                 return 0;
 260
 261         if (!socket_needs_mount(s, m->where))
 262                 return 0;
 263
 264         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 265                 return r;
 266
 267         return 0;
 268 }
 269
 270 static int socket_add_mount_links(Socket *s) {
 271         Unit *other;
 272         int r;
 273
 274         assert(s);
 275
 276         LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
 277                 if ((r = socket_add_one_mount_link(s, MOUNT(other))) < 0)
 278                         return r;
 279
 280         return 0;
 281 }
 282
 283 static int socket_add_device_link(Socket *s) {
 284         char *t;
 285         int r;
 286
 287         assert(s);
 288
 289         if (!s->bind_to_device)
 290                 return 0;
 291
 292         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 293                 return -ENOMEM;
 294
 295         r = unit_add_node_link(UNIT(s), t, false);
 296         free(t);
 297
 298         return r;
 299 }
 300
 301 static int socket_add_default_dependencies(Socket *s) {
 302         int r;
 303         assert(s);
 304
 305         if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
 306                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
 307                         return r;
 308
 309                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 310                         return r;
 311         }
 312
 313         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 314 }
 315
 316 static bool socket_has_exec(Socket *s) {
 317         unsigned i;
 318         assert(s);
 319
 320         for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
 321                 if (s->exec_command[i])
 322                         return true;
 323
 324         return false;
 325 }
 326
 327 static int socket_load(Unit *u) {
 328         Socket *s = SOCKET(u);
 329         int r;
 330
 331         assert(u);
 332         assert(u->load_state == UNIT_STUB);
 333
 334         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 335                 return r;
 336
 337         /* This is a new unit? Then let's add in some extras */
 338         if (u->load_state == UNIT_LOADED) {
 339
 340                 if (have_non_accept_socket(s)) {
 341
 342                         if (!UNIT_DEREF(s->service)) {
 343                                 Unit *x;
 344
 345                                 r = unit_load_related_unit(u, ".service", &x);
 346                                 if (r < 0)
 347                                         return r;
 348
 349                                 unit_ref_set(&s->service, x);
 350                         }
 351
 352                         r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
 353                         if (r < 0)
 354                                 return r;
 355                 }
 356
 357                 if ((r = socket_add_mount_links(s)) < 0)
 358                         return r;
 359
 360                 if ((r = socket_add_device_link(s)) < 0)
 361                         return r;
 362
 363                 if (socket_has_exec(s))
 364                         if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 365                                 return r;
 366
 367                 if ((r = unit_add_default_cgroups(u)) < 0)
 368                         return r;
 369
 370                 if (UNIT(s)->default_dependencies)
 371                         if ((r = socket_add_default_dependencies(s)) < 0)
 372                                 return r;
 373         }
 374
 375         return socket_verify(s);
 376 }
 377
 378 static const char* listen_lookup(int family, int type) {
 379
 380         if (family == AF_NETLINK)
 381                 return "ListenNetlink";
 382
 383         if (type == SOCK_STREAM)
 384                 return "ListenStream";
 385         else if (type == SOCK_DGRAM)
 386                 return "ListenDatagram";
 387         else if (type == SOCK_SEQPACKET)
 388                 return "ListenSequentialPacket";
 389
 390         assert_not_reached("Unknown socket type");
 391         return NULL;
 392 }
 393
 394 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 395
 396         SocketExecCommand c;
 397         Socket *s = SOCKET(u);
 398         SocketPort *p;
 399         const char *prefix2;
 400         char *p2;
 401
 402         assert(s);
 403         assert(f);
 404
 405         p2 = strappend(prefix, "\t");
 406         prefix2 = p2 ? p2 : prefix;
 407
 408         fprintf(f,
 409                 "%sSocket State: %s\n"
 410                 "%sResult: %s\n"
 411                 "%sBindIPv6Only: %s\n"
 412                 "%sBacklog: %u\n"
 413                 "%sSocketMode: %04o\n"
 414                 "%sDirectoryMode: %04o\n"
 415                 "%sKeepAlive: %s\n"
 416                 "%sFreeBind: %s\n"
 417                 "%sTransparent: %s\n"
 418                 "%sBroadcast: %s\n"
 419                 "%sPassCredentials: %s\n"
 420                 "%sTCPCongestion: %s\n",
 421                 prefix, socket_state_to_string(s->state),
 422                 prefix, socket_result_to_string(s->result),
 423                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 424                 prefix, s->backlog,
 425                 prefix, s->socket_mode,
 426                 prefix, s->directory_mode,
 427                 prefix, yes_no(s->keep_alive),
 428                 prefix, yes_no(s->free_bind),
 429                 prefix, yes_no(s->transparent),
 430                 prefix, yes_no(s->broadcast),
 431                 prefix, yes_no(s->pass_cred),
 432                 prefix, strna(s->tcp_congestion));
 433
 434         if (s->control_pid > 0)
 435                 fprintf(f,
 436                         "%sControl PID: %lu\n",
 437                         prefix, (unsigned long) s->control_pid);
 438
 439         if (s->bind_to_device)
 440                 fprintf(f,
 441                         "%sBindToDevice: %s\n",
 442                         prefix, s->bind_to_device);
 443
 444         if (s->accept)
 445                 fprintf(f,
 446                         "%sAccepted: %u\n"
 447                         "%sNConnections: %u\n"
 448                         "%sMaxConnections: %u\n",
 449                         prefix, s->n_accepted,
 450                         prefix, s->n_connections,
 451                         prefix, s->max_connections);
 452
 453         if (s->priority >= 0)
 454                 fprintf(f,
 455                         "%sPriority: %i\n",
 456                         prefix, s->priority);
 457
 458         if (s->receive_buffer > 0)
 459                 fprintf(f,
 460                         "%sReceiveBuffer: %zu\n",
 461                         prefix, s->receive_buffer);
 462
 463         if (s->send_buffer > 0)
 464                 fprintf(f,
 465                         "%sSendBuffer: %zu\n",
 466                         prefix, s->send_buffer);
 467
 468         if (s->ip_tos >= 0)
 469                 fprintf(f,
 470                         "%sIPTOS: %i\n",
 471                         prefix, s->ip_tos);
 472
 473         if (s->ip_ttl >= 0)
 474                 fprintf(f,
 475                         "%sIPTTL: %i\n",
 476                         prefix, s->ip_ttl);
 477
 478         if (s->pipe_size > 0)
 479                 fprintf(f,
 480                         "%sPipeSize: %zu\n",
 481                         prefix, s->pipe_size);
 482
 483         if (s->mark >= 0)
 484                 fprintf(f,
 485                         "%sMark: %i\n",
 486                         prefix, s->mark);
 487
 488         if (s->mq_maxmsg > 0)
 489                 fprintf(f,
 490                         "%sMessageQueueMaxMessages: %li\n",
 491                         prefix, s->mq_maxmsg);
 492
 493         if (s->mq_msgsize > 0)
 494                 fprintf(f,
 495                         "%sMessageQueueMessageSize: %li\n",
 496                         prefix, s->mq_msgsize);
 497
 498         LIST_FOREACH(port, p, s->ports) {
 499
 500                 if (p->type == SOCKET_SOCKET) {
 501                         const char *t;
 502                         int r;
 503                         char *k = NULL;
 504
 505                         if ((r = socket_address_print(&p->address, &k)) < 0)
 506                                 t = strerror(-r);
 507                         else
 508                                 t = k;
 509
 510                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
 511                         free(k);
 512                 } else if (p->type == SOCKET_SPECIAL)
 513                         fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
 514                 else if (p->type == SOCKET_MQUEUE)
 515                         fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
 516                 else
 517                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 518         }
 519
 520         exec_context_dump(&s->exec_context, f, prefix);
 521
 522         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 523                 if (!s->exec_command[c])
 524                         continue;
 525
 526                 fprintf(f, "%s-> %s:\n",
 527                         prefix, socket_exec_command_to_string(c));
 528
 529                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 530         }
 531
 532         free(p2);
 533 }
 534
 535 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 536         socklen_t l;
 537         char *r;
 538         union {
 539                 struct sockaddr sa;
 540                 struct sockaddr_un un;
 541                 struct sockaddr_in in;
 542                 struct sockaddr_in6 in6;
 543                 struct sockaddr_storage storage;
 544         } local, remote;
 545
 546         assert(fd >= 0);
 547         assert(instance);
 548
 549         l = sizeof(local);
 550         if (getsockname(fd, &local.sa, &l) < 0)
 551                 return -errno;
 552
 553         l = sizeof(remote);
 554         if (getpeername(fd, &remote.sa, &l) < 0)
 555                 return -errno;
 556
 557         switch (local.sa.sa_family) {
 558
 559         case AF_INET: {
 560                 uint32_t
 561                         a = ntohl(local.in.sin_addr.s_addr),
 562                         b = ntohl(remote.in.sin_addr.s_addr);
 563
 564                 if (asprintf(&r,
 565                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 566                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 567                              ntohs(local.in.sin_port),
 568                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 569                              ntohs(remote.in.sin_port)) < 0)
 570                         return -ENOMEM;
 571
 572                 break;
 573         }
 574
 575         case AF_INET6: {
 576                 static const char ipv4_prefix[] = {
 577                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 578                 };
 579
 580                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 581                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 582                         const uint8_t
 583                                 *a = local.in6.sin6_addr.s6_addr+12,
 584                                 *b = remote.in6.sin6_addr.s6_addr+12;
 585
 586                         if (asprintf(&r,
 587                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 588                                      a[0], a[1], a[2], a[3],
 589                                      ntohs(local.in6.sin6_port),
 590                                      b[0], b[1], b[2], b[3],
 591                                      ntohs(remote.in6.sin6_port)) < 0)
 592                                 return -ENOMEM;
 593                 } else {
 594                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 595
 596                         if (asprintf(&r,
 597                                      "%s:%u-%s:%u",
 598                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 599                                      ntohs(local.in6.sin6_port),
 600                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 601                                      ntohs(remote.in6.sin6_port)) < 0)
 602                                 return -ENOMEM;
 603                 }
 604
 605                 break;
 606         }
 607
 608         case AF_UNIX: {
 609                 struct ucred ucred;
 610
 611                 l = sizeof(ucred);
 612                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 613                         return -errno;
 614
 615                 if (asprintf(&r,
 616                              "%u-%lu-%lu",
 617                              nr,
 618                              (unsigned long) ucred.pid,
 619                              (unsigned long) ucred.uid) < 0)
 620                         return -ENOMEM;
 621
 622                 break;
 623         }
 624
 625         default:
 626                 assert_not_reached("Unhandled socket type.");
 627         }
 628
 629         *instance = r;
 630         return 0;
 631 }
 632
 633 static void socket_close_fds(Socket *s) {
 634         SocketPort *p;
 635
 636         assert(s);
 637
 638         LIST_FOREACH(port, p, s->ports) {
 639                 if (p->fd < 0)
 640                         continue;
 641
 642                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 643                 close_nointr_nofail(p->fd);
 644
 645                 /* One little note: we should never delete any sockets
 646                  * in the file system here! After all some other
 647                  * process we spawned might still have a reference of
 648                  * this fd and wants to continue to use it. Therefore
 649                  * we delete sockets in the file system before we
 650                  * create a new one, not after we stopped using
 651                  * one! */
 652
 653                 p->fd = -1;
 654         }
 655 }
 656
 657 static void socket_apply_socket_options(Socket *s, int fd) {
 658         assert(s);
 659         assert(fd >= 0);
 660
 661         if (s->keep_alive) {
 662                 int b = s->keep_alive;
 663                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 664                         log_warning("SO_KEEPALIVE failed: %m");
 665         }
 666
 667         if (s->broadcast) {
 668                 int one = 1;
 669                 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
 670                         log_warning("SO_BROADCAST failed: %m");
 671         }
 672
 673         if (s->pass_cred) {
 674                 int one = 1;
 675                 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
 676                         log_warning("SO_PASSCRED failed: %m");
 677         }
 678
 679         if (s->priority >= 0)
 680                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 681                         log_warning("SO_PRIORITY failed: %m");
 682
 683         if (s->receive_buffer > 0) {
 684                 int value = (int) s->receive_buffer;
 685
 686                 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
 687
 688                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
 689                         if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 690                                 log_warning("SO_RCVBUF failed: %m");
 691         }
 692
 693         if (s->send_buffer > 0) {
 694                 int value = (int) s->send_buffer;
 695                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
 696                         if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 697                                 log_warning("SO_SNDBUF failed: %m");
 698         }
 699
 700         if (s->mark >= 0)
 701                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 702                         log_warning("SO_MARK failed: %m");
 703
 704         if (s->ip_tos >= 0)
 705                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 706                         log_warning("IP_TOS failed: %m");
 707
 708         if (s->ip_ttl >= 0) {
 709                 int r, x;
 710
 711                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 712
 713                 if (socket_ipv6_is_supported())
 714                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 715                 else {
 716                         x = -1;
 717                         errno = EAFNOSUPPORT;
 718                 }
 719
 720                 if (r < 0 && x < 0)
 721                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 722         }
 723
 724         if (s->tcp_congestion)
 725                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 726                         log_warning("TCP_CONGESTION failed: %m");
 727 }
 728
 729 static void socket_apply_fifo_options(Socket *s, int fd) {
 730         assert(s);
 731         assert(fd >= 0);
 732
 733         if (s->pipe_size > 0)
 734                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 735                         log_warning("F_SETPIPE_SZ: %m");
 736 }
 737
 738 static int fifo_address_create(
 739                 const char *path,
 740                 mode_t directory_mode,
 741                 mode_t socket_mode,
 742                 int *_fd) {
 743
 744         int fd = -1, r = 0;
 745         struct stat st;
 746         mode_t old_mask;
 747
 748         assert(path);
 749         assert(_fd);
 750
 751         mkdir_parents(path, directory_mode);
 752
 753         if ((r = label_fifofile_set(path)) < 0)
 754                 goto fail;
 755
 756         /* Enforce the right access mode for the fifo */
 757         old_mask = umask(~ socket_mode);
 758
 759         /* Include the original umask in our mask */
 760         umask(~socket_mode | old_mask);
 761
 762         r = mkfifo(path, socket_mode);
 763         umask(old_mask);
 764
 765         if (r < 0 && errno != EEXIST) {
 766                 r = -errno;
 767                 goto fail;
 768         }
 769
 770         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 771                 r = -errno;
 772                 goto fail;
 773         }
 774
 775         label_file_clear();
 776
 777         if (fstat(fd, &st) < 0) {
 778                 r = -errno;
 779                 goto fail;
 780         }
 781
 782         if (!S_ISFIFO(st.st_mode) ||
 783             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 784             st.st_uid != getuid() ||
 785             st.st_gid != getgid()) {
 786
 787                 r = -EEXIST;
 788                 goto fail;
 789         }
 790
 791         *_fd = fd;
 792         return 0;
 793
 794 fail:
 795         label_file_clear();
 796
 797         if (fd >= 0)
 798                 close_nointr_nofail(fd);
 799
 800         return r;
 801 }
 802
 803 static int special_address_create(
 804                 const char *path,
 805                 int *_fd) {
 806
 807         int fd = -1, r = 0;
 808         struct stat st;
 809
 810         assert(path);
 811         assert(_fd);
 812
 813         if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 814                 r = -errno;
 815                 goto fail;
 816         }
 817
 818         if (fstat(fd, &st) < 0) {
 819                 r = -errno;
 820                 goto fail;
 821         }
 822
 823         /* Check whether this is a /proc, /sys or /dev file or char device */
 824         if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
 825                 r = -EEXIST;
 826                 goto fail;
 827         }
 828
 829         *_fd = fd;
 830         return 0;
 831
 832 fail:
 833         if (fd >= 0)
 834                 close_nointr_nofail(fd);
 835
 836         return r;
 837 }
 838
 839 static int mq_address_create(
 840                 const char *path,
 841                 mode_t mq_mode,
 842                 long maxmsg,
 843                 long msgsize,
 844                 int *_fd) {
 845
 846         int fd = -1, r = 0;
 847         struct stat st;
 848         mode_t old_mask;
 849         struct mq_attr _attr, *attr = NULL;
 850
 851         assert(path);
 852         assert(_fd);
 853
 854         if (maxmsg > 0 && msgsize > 0) {
 855                 zero(_attr);
 856                 _attr.mq_flags = O_NONBLOCK;
 857                 _attr.mq_maxmsg = maxmsg;
 858                 _attr.mq_msgsize = msgsize;
 859                 attr = &_attr;
 860         }
 861
 862         /* Enforce the right access mode for the mq */
 863         old_mask = umask(~ mq_mode);
 864
 865         /* Include the original umask in our mask */
 866         umask(~mq_mode | old_mask);
 867
 868         fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
 869         umask(old_mask);
 870
 871         if (fd < 0) {
 872                 r = -errno;
 873                 goto fail;
 874         }
 875
 876         if (fstat(fd, &st) < 0) {
 877                 r = -errno;
 878                 goto fail;
 879         }
 880
 881         if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
 882             st.st_uid != getuid() ||
 883             st.st_gid != getgid()) {
 884
 885                 r = -EEXIST;
 886                 goto fail;
 887         }
 888
 889         *_fd = fd;
 890         return 0;
 891
 892 fail:
 893         if (fd >= 0)
 894                 close_nointr_nofail(fd);
 895
 896         return r;
 897 }
 898
 899 static int socket_open_fds(Socket *s) {
 900         SocketPort *p;
 901         int r;
 902         char *label = NULL;
 903         bool know_label = false;
 904
 905         assert(s);
 906
 907         LIST_FOREACH(port, p, s->ports) {
 908
 909                 if (p->fd >= 0)
 910                         continue;
 911
 912                 if (p->type == SOCKET_SOCKET) {
 913
 914                         if (!know_label) {
 915
 916                                 if ((r = socket_instantiate_service(s)) < 0)
 917                                         return r;
 918
 919                                 if (UNIT_DEREF(s->service) &&
 920                                     SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
 921                                         r = label_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
 922
 923                                         if (r < 0) {
 924                                                 if (r != -EPERM)
 925                                                         return r;
 926                                         }
 927                                 }
 928
 929                                 know_label = true;
 930                         }
 931
 932                         if ((r = socket_address_listen(
 933                                              &p->address,
 934                                              s->backlog,
 935                                              s->bind_ipv6_only,
 936                                              s->bind_to_device,
 937                                              s->free_bind,
 938                                              s->transparent,
 939                                              s->directory_mode,
 940                                              s->socket_mode,
 941                                              label,
 942                                              &p->fd)) < 0)
 943                                 goto rollback;
 944
 945                         socket_apply_socket_options(s, p->fd);
 946
 947                 } else  if (p->type == SOCKET_SPECIAL) {
 948
 949                         if ((r = special_address_create(
 950                                              p->path,
 951                                              &p->fd)) < 0)
 952                                 goto rollback;
 953
 954                 } else  if (p->type == SOCKET_FIFO) {
 955
 956                         if ((r = fifo_address_create(
 957                                              p->path,
 958                                              s->directory_mode,
 959                                              s->socket_mode,
 960                                              &p->fd)) < 0)
 961                                 goto rollback;
 962
 963                         socket_apply_fifo_options(s, p->fd);
 964                 } else if (p->type == SOCKET_MQUEUE) {
 965
 966                         if ((r = mq_address_create(
 967                                              p->path,
 968                                              s->socket_mode,
 969                                              s->mq_maxmsg,
 970                                              s->mq_msgsize,
 971                                              &p->fd)) < 0)
 972                                 goto rollback;
 973                 } else
 974                         assert_not_reached("Unknown port type");
 975         }
 976
 977         label_free(label);
 978         return 0;
 979
 980 rollback:
 981         socket_close_fds(s);
 982         label_free(label);
 983         return r;
 984 }
 985
 986 static void socket_unwatch_fds(Socket *s) {
 987         SocketPort *p;
 988
 989         assert(s);
 990
 991         LIST_FOREACH(port, p, s->ports) {
 992                 if (p->fd < 0)
 993                         continue;
 994
 995                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 996         }
 997 }
 998
 999 static int socket_watch_fds(Socket *s) {
1000         SocketPort *p;
1001         int r;
1002
1003         assert(s);
1004
1005         LIST_FOREACH(port, p, s->ports) {
1006                 if (p->fd < 0)
1007                         continue;
1008
1009                 p->fd_watch.socket_accept =
1010                         s->accept &&
1011                         p->type == SOCKET_SOCKET &&
1012                         socket_address_can_accept(&p->address);
1013
1014                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
1015                         goto fail;
1016         }
1017
1018         return 0;
1019
1020 fail:
1021         socket_unwatch_fds(s);
1022         return r;
1023 }
1024
1025 static void socket_set_state(Socket *s, SocketState state) {
1026         SocketState old_state;
1027         assert(s);
1028
1029         old_state = s->state;
1030         s->state = state;
1031
1032         if (state != SOCKET_START_PRE &&
1033             state != SOCKET_START_POST &&
1034             state != SOCKET_STOP_PRE &&
1035             state != SOCKET_STOP_PRE_SIGTERM &&
1036             state != SOCKET_STOP_PRE_SIGKILL &&
1037             state != SOCKET_STOP_POST &&
1038             state != SOCKET_FINAL_SIGTERM &&
1039             state != SOCKET_FINAL_SIGKILL) {
1040                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1041                 socket_unwatch_control_pid(s);
1042                 s->control_command = NULL;
1043                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1044         }
1045
1046         if (state != SOCKET_LISTENING)
1047                 socket_unwatch_fds(s);
1048
1049         if (state != SOCKET_START_POST &&
1050             state != SOCKET_LISTENING &&
1051             state != SOCKET_RUNNING &&
1052             state != SOCKET_STOP_PRE &&
1053             state != SOCKET_STOP_PRE_SIGTERM &&
1054             state != SOCKET_STOP_PRE_SIGKILL)
1055                 socket_close_fds(s);
1056
1057         if (state != old_state)
1058                 log_debug("%s changed %s -> %s",
1059                           UNIT(s)->id,
1060                           socket_state_to_string(old_state),
1061                           socket_state_to_string(state));
1062
1063         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1064 }
1065
1066 static int socket_coldplug(Unit *u) {
1067         Socket *s = SOCKET(u);
1068         int r;
1069
1070         assert(s);
1071         assert(s->state == SOCKET_DEAD);
1072
1073         if (s->deserialized_state != s->state) {
1074
1075                 if (s->deserialized_state == SOCKET_START_PRE ||
1076                     s->deserialized_state == SOCKET_START_POST ||
1077                     s->deserialized_state == SOCKET_STOP_PRE ||
1078                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1079                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
1080                     s->deserialized_state == SOCKET_STOP_POST ||
1081                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
1082                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
1083
1084                         if (s->control_pid <= 0)
1085                                 return -EBADMSG;
1086
1087                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
1088                                 return r;
1089
1090                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1091                                 return r;
1092                 }
1093
1094                 if (s->deserialized_state == SOCKET_START_POST ||
1095                     s->deserialized_state == SOCKET_LISTENING ||
1096                     s->deserialized_state == SOCKET_RUNNING ||
1097                     s->deserialized_state == SOCKET_STOP_PRE ||
1098                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1099                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
1100                         if ((r = socket_open_fds(s)) < 0)
1101                                 return r;
1102
1103                 if (s->deserialized_state == SOCKET_LISTENING)
1104                         if ((r = socket_watch_fds(s)) < 0)
1105                                 return r;
1106
1107                 socket_set_state(s, s->deserialized_state);
1108         }
1109
1110         return 0;
1111 }
1112
1113 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1114         pid_t pid;
1115         int r;
1116         char **argv;
1117
1118         assert(s);
1119         assert(c);
1120         assert(_pid);
1121
1122         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1123                 goto fail;
1124
1125         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
1126                 r = -ENOMEM;
1127                 goto fail;
1128         }
1129
1130         r = exec_spawn(c,
1131                        argv,
1132                        &s->exec_context,
1133                        NULL, 0,
1134                        UNIT(s)->manager->environment,
1135                        true,
1136                        true,
1137                        true,
1138                        UNIT(s)->manager->confirm_spawn,
1139                        UNIT(s)->cgroup_bondings,
1140                        UNIT(s)->cgroup_attributes,
1141                        &pid);
1142
1143         strv_free(argv);
1144         if (r < 0)
1145                 goto fail;
1146
1147         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
1148                 /* FIXME: we need to do something here */
1149                 goto fail;
1150
1151         *_pid = pid;
1152
1153         return 0;
1154
1155 fail:
1156         unit_unwatch_timer(UNIT(s), &s->timer_watch);
1157
1158         return r;
1159 }
1160
1161 static void socket_enter_dead(Socket *s, SocketResult f) {
1162         assert(s);
1163
1164         if (f != SOCKET_SUCCESS)
1165                 s->result = f;
1166
1167         socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1168 }
1169
1170 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1171
1172 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1173         int r;
1174         assert(s);
1175
1176         if (f != SOCKET_SUCCESS)
1177                 s->result = f;
1178
1179         socket_unwatch_control_pid(s);
1180
1181         s->control_command_id = SOCKET_EXEC_STOP_POST;
1182
1183         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1184                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1185                         goto fail;
1186
1187                 socket_set_state(s, SOCKET_STOP_POST);
1188         } else
1189                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1190
1191         return;
1192
1193 fail:
1194         log_warning("%s failed to run 'stop-post' task: %s", UNIT(s)->id, strerror(-r));
1195         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1196 }
1197
1198 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1199         int r;
1200         Set *pid_set = NULL;
1201         bool wait_for_exit = false;
1202
1203         assert(s);
1204
1205         if (f != SOCKET_SUCCESS)
1206                 s->result = f;
1207
1208         if (s->exec_context.kill_mode != KILL_NONE) {
1209                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1210
1211                 if (s->control_pid > 0) {
1212                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1213
1214                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1215                         else
1216                                 wait_for_exit = true;
1217                 }
1218
1219                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1220
1221                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1222                                 r = -ENOMEM;
1223                                 goto fail;
1224                         }
1225
1226                         /* Exclude the control pid from being killed via the cgroup */
1227                         if (s->control_pid > 0)
1228                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1229                                         goto fail;
1230
1231                         if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 0) {
1232                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1233                                         log_warning("Failed to kill control group: %s", strerror(-r));
1234                         } else if (r > 0)
1235                                 wait_for_exit = true;
1236
1237                         set_free(pid_set);
1238                         pid_set = NULL;
1239                 }
1240         }
1241
1242         if (wait_for_exit) {
1243                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1244                         goto fail;
1245
1246                 socket_set_state(s, state);
1247         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1248                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1249         else
1250                 socket_enter_dead(s, SOCKET_SUCCESS);
1251
1252         return;
1253
1254 fail:
1255         log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
1256
1257         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1258                 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1259         else
1260                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1261
1262         if (pid_set)
1263                 set_free(pid_set);
1264 }
1265
1266 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1267         int r;
1268         assert(s);
1269
1270         if (f != SOCKET_SUCCESS)
1271                 s->result = f;
1272
1273         socket_unwatch_control_pid(s);
1274
1275         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1276
1277         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1278                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1279                         goto fail;
1280
1281                 socket_set_state(s, SOCKET_STOP_PRE);
1282         } else
1283                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1284
1285         return;
1286
1287 fail:
1288         log_warning("%s failed to run 'stop-pre' task: %s", UNIT(s)->id, strerror(-r));
1289         socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1290 }
1291
1292 static void socket_enter_listening(Socket *s) {
1293         int r;
1294         assert(s);
1295
1296         r = socket_watch_fds(s);
1297         if (r < 0) {
1298                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1299                 goto fail;
1300         }
1301
1302         socket_set_state(s, SOCKET_LISTENING);
1303         return;
1304
1305 fail:
1306         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1307 }
1308
1309 static void socket_enter_start_post(Socket *s) {
1310         int r;
1311         assert(s);
1312
1313         r = socket_open_fds(s);
1314         if (r < 0) {
1315                 log_warning("%s failed to listen on sockets: %s", UNIT(s)->id, strerror(-r));
1316                 goto fail;
1317         }
1318
1319         socket_unwatch_control_pid(s);
1320
1321         s->control_command_id = SOCKET_EXEC_START_POST;
1322
1323         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1324                 r = socket_spawn(s, s->control_command, &s->control_pid);
1325                 if (r < 0) {
1326                         log_warning("%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
1327                         goto fail;
1328                 }
1329
1330                 socket_set_state(s, SOCKET_START_POST);
1331         } else
1332                 socket_enter_listening(s);
1333
1334         return;
1335
1336 fail:
1337         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1338 }
1339
1340 static void socket_enter_start_pre(Socket *s) {
1341         int r;
1342         assert(s);
1343
1344         socket_unwatch_control_pid(s);
1345
1346         s->control_command_id = SOCKET_EXEC_START_PRE;
1347
1348         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1349                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1350                         goto fail;
1351
1352                 socket_set_state(s, SOCKET_START_PRE);
1353         } else
1354                 socket_enter_start_post(s);
1355
1356         return;
1357
1358 fail:
1359         log_warning("%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
1360         socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1361 }
1362
1363 static void socket_enter_running(Socket *s, int cfd) {
1364         int r;
1365         DBusError error;
1366
1367         assert(s);
1368         dbus_error_init(&error);
1369
1370         /* We don't take connections anymore if we are supposed to
1371          * shut down anyway */
1372         if (unit_pending_inactive(UNIT(s))) {
1373                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
1374
1375                 if (cfd >= 0)
1376                         close_nointr_nofail(cfd);
1377                 else  {
1378                         /* Flush all sockets by closing and reopening them */
1379                         socket_close_fds(s);
1380
1381                         r = socket_watch_fds(s);
1382                         if (r < 0) {
1383                                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1384                                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1385                         }
1386                 }
1387
1388                 return;
1389         }
1390
1391         if (cfd < 0) {
1392                 Iterator i;
1393                 Unit *u;
1394                 bool pending = false;
1395
1396                 /* If there's already a start pending don't bother to
1397                  * do anything */
1398                 SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
1399                         if (unit_pending_active(u)) {
1400                                 pending = true;
1401                                 break;
1402                         }
1403
1404                 if (!pending) {
1405                         r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
1406                         if (r < 0)
1407                                 goto fail;
1408                 }
1409
1410                 socket_set_state(s, SOCKET_RUNNING);
1411         } else {
1412                 char *prefix, *instance = NULL, *name;
1413                 Service *service;
1414
1415                 if (s->n_connections >= s->max_connections) {
1416                         log_warning("Too many incoming connections (%u)", s->n_connections);
1417                         close_nointr_nofail(cfd);
1418                         return;
1419                 }
1420
1421                 r = socket_instantiate_service(s);
1422                 if (r < 0)
1423                         goto fail;
1424
1425                 r = instance_from_socket(cfd, s->n_accepted, &instance);
1426                 if (r < 0) {
1427                         if (r != -ENOTCONN)
1428                                 goto fail;
1429
1430                         /* ENOTCONN is legitimate if TCP RST was received.
1431                          * This connection is over, but the socket unit lives on. */
1432                         close_nointr_nofail(cfd);
1433                         return;
1434                 }
1435
1436                 prefix = unit_name_to_prefix(UNIT(s)->id);
1437                 if (!prefix) {
1438                         free(instance);
1439                         r = -ENOMEM;
1440                         goto fail;
1441                 }
1442
1443                 name = unit_name_build(prefix, instance, ".service");
1444                 free(prefix);
1445                 free(instance);
1446
1447                 if (!name) {
1448                         r = -ENOMEM;
1449                         goto fail;
1450                 }
1451
1452                 r = unit_add_name(UNIT_DEREF(s->service), name);
1453                 if (r < 0) {
1454                         free(name);
1455                         goto fail;
1456                 }
1457
1458                 service = SERVICE(UNIT_DEREF(s->service));
1459                 unit_ref_unset(&s->service);
1460                 s->n_accepted ++;
1461
1462                 UNIT(service)->no_gc = false;
1463
1464                 unit_choose_id(UNIT(service), name);
1465                 free(name);
1466
1467                 r = service_set_socket_fd(service, cfd, s);
1468                 if (r < 0)
1469                         goto fail;
1470
1471                 cfd = -1;
1472                 s->n_connections ++;
1473
1474                 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
1475                 if (r < 0)
1476                         goto fail;
1477
1478                 /* Notify clients about changed counters */
1479                 unit_add_to_dbus_queue(UNIT(s));
1480         }
1481
1482         return;
1483
1484 fail:
1485         log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
1486         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1487
1488         if (cfd >= 0)
1489                 close_nointr_nofail(cfd);
1490
1491         dbus_error_free(&error);
1492 }
1493
1494 static void socket_run_next(Socket *s) {
1495         int r;
1496
1497         assert(s);
1498         assert(s->control_command);
1499         assert(s->control_command->command_next);
1500
1501         socket_unwatch_control_pid(s);
1502
1503         s->control_command = s->control_command->command_next;
1504
1505         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1506                 goto fail;
1507
1508         return;
1509
1510 fail:
1511         log_warning("%s failed to run next task: %s", UNIT(s)->id, strerror(-r));
1512
1513         if (s->state == SOCKET_START_POST)
1514                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1515         else if (s->state == SOCKET_STOP_POST)
1516                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1517         else
1518                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1519 }
1520
1521 static int socket_start(Unit *u) {
1522         Socket *s = SOCKET(u);
1523
1524         assert(s);
1525
1526         /* We cannot fulfill this request right now, try again later
1527          * please! */
1528         if (s->state == SOCKET_STOP_PRE ||
1529             s->state == SOCKET_STOP_PRE_SIGKILL ||
1530             s->state == SOCKET_STOP_PRE_SIGTERM ||
1531             s->state == SOCKET_STOP_POST ||
1532             s->state == SOCKET_FINAL_SIGTERM ||
1533             s->state == SOCKET_FINAL_SIGKILL)
1534                 return -EAGAIN;
1535
1536         if (s->state == SOCKET_START_PRE ||
1537             s->state == SOCKET_START_POST)
1538                 return 0;
1539
1540         /* Cannot run this without the service being around */
1541         if (UNIT_DEREF(s->service)) {
1542                 Service *service;
1543
1544                 service = SERVICE(UNIT_DEREF(s->service));
1545
1546                 if (UNIT(service)->load_state != UNIT_LOADED) {
1547                         log_error("Socket service %s not loaded, refusing.", UNIT(service)->id);
1548                         return -ENOENT;
1549                 }
1550
1551                 /* If the service is already active we cannot start the
1552                  * socket */
1553                 if (service->state != SERVICE_DEAD &&
1554                     service->state != SERVICE_FAILED &&
1555                     service->state != SERVICE_AUTO_RESTART) {
1556                         log_error("Socket service %s already active, refusing.", UNIT(service)->id);
1557                         return -EBUSY;
1558                 }
1559
1560 #ifdef HAVE_SYSV_COMPAT
1561                 if (service->sysv_path) {
1562                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1563                         return -ENOENT;
1564                 }
1565 #endif
1566         }
1567
1568         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1569
1570         s->result = SOCKET_SUCCESS;
1571         socket_enter_start_pre(s);
1572         return 0;
1573 }
1574
1575 static int socket_stop(Unit *u) {
1576         Socket *s = SOCKET(u);
1577
1578         assert(s);
1579
1580         /* Already on it */
1581         if (s->state == SOCKET_STOP_PRE ||
1582             s->state == SOCKET_STOP_PRE_SIGTERM ||
1583             s->state == SOCKET_STOP_PRE_SIGKILL ||
1584             s->state == SOCKET_STOP_POST ||
1585             s->state == SOCKET_FINAL_SIGTERM ||
1586             s->state == SOCKET_FINAL_SIGKILL)
1587                 return 0;
1588
1589         /* If there's already something running we go directly into
1590          * kill mode. */
1591         if (s->state == SOCKET_START_PRE ||
1592             s->state == SOCKET_START_POST) {
1593                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
1594                 return -EAGAIN;
1595         }
1596
1597         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1598
1599         socket_enter_stop_pre(s, SOCKET_SUCCESS);
1600         return 0;
1601 }
1602
1603 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1604         Socket *s = SOCKET(u);
1605         SocketPort *p;
1606         int r;
1607
1608         assert(u);
1609         assert(f);
1610         assert(fds);
1611
1612         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1613         unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
1614         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1615
1616         if (s->control_pid > 0)
1617                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1618
1619         if (s->control_command_id >= 0)
1620                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1621
1622         LIST_FOREACH(port, p, s->ports) {
1623                 int copy;
1624
1625                 if (p->fd < 0)
1626                         continue;
1627
1628                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1629                         return copy;
1630
1631                 if (p->type == SOCKET_SOCKET) {
1632                         char *t;
1633
1634                         if ((r = socket_address_print(&p->address, &t)) < 0)
1635                                 return r;
1636
1637                         if (socket_address_family(&p->address) == AF_NETLINK)
1638                                 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
1639                         else
1640                                 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1641                         free(t);
1642                 } else if (p->type == SOCKET_SPECIAL)
1643                         unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
1644                 else {
1645                         assert(p->type == SOCKET_FIFO);
1646                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1647                 }
1648         }
1649
1650         return 0;
1651 }
1652
1653 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1654         Socket *s = SOCKET(u);
1655
1656         assert(u);
1657         assert(key);
1658         assert(value);
1659         assert(fds);
1660
1661         if (streq(key, "state")) {
1662                 SocketState state;
1663
1664                 if ((state = socket_state_from_string(value)) < 0)
1665                         log_debug("Failed to parse state value %s", value);
1666                 else
1667                         s->deserialized_state = state;
1668         } else if (streq(key, "result")) {
1669                 SocketResult f;
1670
1671                 f = socket_result_from_string(value);
1672                 if (f < 0)
1673                         log_debug("Failed to parse result value %s", value);
1674                 else if (f != SOCKET_SUCCESS)
1675                         s->result = f;
1676
1677         } else if (streq(key, "n-accepted")) {
1678                 unsigned k;
1679
1680                 if (safe_atou(value, &k) < 0)
1681                         log_debug("Failed to parse n-accepted value %s", value);
1682                 else
1683                         s->n_accepted += k;
1684         } else if (streq(key, "control-pid")) {
1685                 pid_t pid;
1686
1687                 if (parse_pid(value, &pid) < 0)
1688                         log_debug("Failed to parse control-pid value %s", value);
1689                 else
1690                         s->control_pid = pid;
1691         } else if (streq(key, "control-command")) {
1692                 SocketExecCommand id;
1693
1694                 if ((id = socket_exec_command_from_string(value)) < 0)
1695                         log_debug("Failed to parse exec-command value %s", value);
1696                 else {
1697                         s->control_command_id = id;
1698                         s->control_command = s->exec_command[id];
1699                 }
1700         } else if (streq(key, "fifo")) {
1701                 int fd, skip = 0;
1702                 SocketPort *p;
1703
1704                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1705                         log_debug("Failed to parse fifo value %s", value);
1706                 else {
1707
1708                         LIST_FOREACH(port, p, s->ports)
1709                                 if (p->type == SOCKET_FIFO &&
1710                                     streq_ptr(p->path, value+skip))
1711                                         break;
1712
1713                         if (p) {
1714                                 if (p->fd >= 0)
1715                                         close_nointr_nofail(p->fd);
1716                                 p->fd = fdset_remove(fds, fd);
1717                         }
1718                 }
1719
1720         } else if (streq(key, "special")) {
1721                 int fd, skip = 0;
1722                 SocketPort *p;
1723
1724                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1725                         log_debug("Failed to parse special value %s", value);
1726                 else {
1727
1728                         LIST_FOREACH(port, p, s->ports)
1729                                 if (p->type == SOCKET_SPECIAL &&
1730                                     streq_ptr(p->path, value+skip))
1731                                         break;
1732
1733                         if (p) {
1734                                 if (p->fd >= 0)
1735                                         close_nointr_nofail(p->fd);
1736                                 p->fd = fdset_remove(fds, fd);
1737                         }
1738                 }
1739
1740         } else if (streq(key, "socket")) {
1741                 int fd, type, skip = 0;
1742                 SocketPort *p;
1743
1744                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1745                         log_debug("Failed to parse socket value %s", value);
1746                 else {
1747
1748                         LIST_FOREACH(port, p, s->ports)
1749                                 if (socket_address_is(&p->address, value+skip, type))
1750                                         break;
1751
1752                         if (p) {
1753                                 if (p->fd >= 0)
1754                                         close_nointr_nofail(p->fd);
1755                                 p->fd = fdset_remove(fds, fd);
1756                         }
1757                 }
1758
1759         } else if (streq(key, "netlink")) {
1760                 int fd, skip = 0;
1761                 SocketPort *p;
1762
1763                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1764                         log_debug("Failed to parse socket value %s", value);
1765                 else {
1766
1767                         LIST_FOREACH(port, p, s->ports)
1768                                 if (socket_address_is_netlink(&p->address, value+skip))
1769                                         break;
1770
1771                         if (p) {
1772                                 if (p->fd >= 0)
1773                                         close_nointr_nofail(p->fd);
1774                                 p->fd = fdset_remove(fds, fd);
1775                         }
1776                 }
1777
1778         } else
1779                 log_debug("Unknown serialization key '%s'", key);
1780
1781         return 0;
1782 }
1783
1784 static UnitActiveState socket_active_state(Unit *u) {
1785         assert(u);
1786
1787         return state_translation_table[SOCKET(u)->state];
1788 }
1789
1790 static const char *socket_sub_state_to_string(Unit *u) {
1791         assert(u);
1792
1793         return socket_state_to_string(SOCKET(u)->state);
1794 }
1795
1796 static bool socket_check_gc(Unit *u) {
1797         Socket *s = SOCKET(u);
1798
1799         assert(u);
1800
1801         return s->n_connections > 0;
1802 }
1803
1804 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1805         Socket *s = SOCKET(u);
1806         int cfd = -1;
1807
1808         assert(s);
1809         assert(fd >= 0);
1810
1811         if (s->state != SOCKET_LISTENING)
1812                 return;
1813
1814         log_debug("Incoming traffic on %s", u->id);
1815
1816         if (events != EPOLLIN) {
1817
1818                 if (events & EPOLLHUP)
1819                         log_error("%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.", u->id);
1820                 else
1821                         log_error("%s: Got unexpected poll event (0x%x) on socket.", u->id, events);
1822
1823                 goto fail;
1824         }
1825
1826         if (w->socket_accept) {
1827                 for (;;) {
1828
1829                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1830
1831                                 if (errno == EINTR)
1832                                         continue;
1833
1834                                 log_error("Failed to accept socket: %m");
1835                                 goto fail;
1836                         }
1837
1838                         break;
1839                 }
1840
1841                 socket_apply_socket_options(s, cfd);
1842         }
1843
1844         socket_enter_running(s, cfd);
1845         return;
1846
1847 fail:
1848         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1849 }
1850
1851 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1852         Socket *s = SOCKET(u);
1853         SocketResult f;
1854
1855         assert(s);
1856         assert(pid >= 0);
1857
1858         if (pid != s->control_pid)
1859                 return;
1860
1861         s->control_pid = 0;
1862
1863         if (is_clean_exit(code, status))
1864                 f = SOCKET_SUCCESS;
1865         else if (code == CLD_EXITED)
1866                 f = SOCKET_FAILURE_EXIT_CODE;
1867         else if (code == CLD_KILLED)
1868                 f = SOCKET_FAILURE_SIGNAL;
1869         else if (code == CLD_DUMPED)
1870                 f = SOCKET_FAILURE_CORE_DUMP;
1871         else
1872                 assert_not_reached("Unknown code");
1873
1874         if (s->control_command) {
1875                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1876
1877                 if (s->control_command->ignore)
1878                         f = SOCKET_SUCCESS;
1879         }
1880
1881         log_full(f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1882                  "%s control process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1883
1884         if (f != SOCKET_SUCCESS)
1885                 s->result = f;
1886
1887         if (s->control_command &&
1888             s->control_command->command_next &&
1889             f == SOCKET_SUCCESS) {
1890
1891                 log_debug("%s running next command for state %s", u->id, socket_state_to_string(s->state));
1892                 socket_run_next(s);
1893         } else {
1894                 s->control_command = NULL;
1895                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1896
1897                 /* No further commands for this step, so let's figure
1898                  * out what to do next */
1899
1900                 log_debug("%s got final SIGCHLD for state %s", u->id, socket_state_to_string(s->state));
1901
1902                 switch (s->state) {
1903
1904                 case SOCKET_START_PRE:
1905                         if (f == SOCKET_SUCCESS)
1906                                 socket_enter_start_post(s);
1907                         else
1908                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
1909                         break;
1910
1911                 case SOCKET_START_POST:
1912                         if (f == SOCKET_SUCCESS)
1913                                 socket_enter_listening(s);
1914                         else
1915                                 socket_enter_stop_pre(s, f);
1916                         break;
1917
1918                 case SOCKET_STOP_PRE:
1919                 case SOCKET_STOP_PRE_SIGTERM:
1920                 case SOCKET_STOP_PRE_SIGKILL:
1921                         socket_enter_stop_post(s, f);
1922                         break;
1923
1924                 case SOCKET_STOP_POST:
1925                 case SOCKET_FINAL_SIGTERM:
1926                 case SOCKET_FINAL_SIGKILL:
1927                         socket_enter_dead(s, f);
1928                         break;
1929
1930                 default:
1931                         assert_not_reached("Uh, control process died at wrong time.");
1932                 }
1933         }
1934
1935         /* Notify clients about changed exit status */
1936         unit_add_to_dbus_queue(u);
1937 }
1938
1939 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1940         Socket *s = SOCKET(u);
1941
1942         assert(s);
1943         assert(elapsed == 1);
1944         assert(w == &s->timer_watch);
1945
1946         switch (s->state) {
1947
1948         case SOCKET_START_PRE:
1949                 log_warning("%s starting timed out. Terminating.", u->id);
1950                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1951                 break;
1952
1953         case SOCKET_START_POST:
1954                 log_warning("%s starting timed out. Stopping.", u->id);
1955                 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
1956                 break;
1957
1958         case SOCKET_STOP_PRE:
1959                 log_warning("%s stopping timed out. Terminating.", u->id);
1960                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1961                 break;
1962
1963         case SOCKET_STOP_PRE_SIGTERM:
1964                 if (s->exec_context.send_sigkill) {
1965                         log_warning("%s stopping timed out. Killing.", u->id);
1966                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1967                 } else {
1968                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->id);
1969                         socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1970                 }
1971                 break;
1972
1973         case SOCKET_STOP_PRE_SIGKILL:
1974                 log_warning("%s still around after SIGKILL. Ignoring.", u->id);
1975                 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1976                 break;
1977
1978         case SOCKET_STOP_POST:
1979                 log_warning("%s stopping timed out (2). Terminating.", u->id);
1980                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1981                 break;
1982
1983         case SOCKET_FINAL_SIGTERM:
1984                 if (s->exec_context.send_sigkill) {
1985                         log_warning("%s stopping timed out (2). Killing.", u->id);
1986                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1987                 } else {
1988                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->id);
1989                         socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
1990                 }
1991                 break;
1992
1993         case SOCKET_FINAL_SIGKILL:
1994                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->id);
1995                 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
1996                 break;
1997
1998         default:
1999                 assert_not_reached("Timeout at wrong time.");
2000         }
2001 }
2002
2003 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
2004         int *rfds;
2005         unsigned rn_fds, k;
2006         SocketPort *p;
2007
2008         assert(s);
2009         assert(fds);
2010         assert(n_fds);
2011
2012         /* Called from the service code for requesting our fds */
2013
2014         rn_fds = 0;
2015         LIST_FOREACH(port, p, s->ports)
2016                 if (p->fd >= 0)
2017                         rn_fds++;
2018
2019         if (rn_fds <= 0) {
2020                 *fds = NULL;
2021                 *n_fds = 0;
2022                 return 0;
2023         }
2024
2025         if (!(rfds = new(int, rn_fds)))
2026                 return -ENOMEM;
2027
2028         k = 0;
2029         LIST_FOREACH(port, p, s->ports)
2030                 if (p->fd >= 0)
2031                         rfds[k++] = p->fd;
2032
2033         assert(k == rn_fds);
2034
2035         *fds = rfds;
2036         *n_fds = rn_fds;
2037
2038         return 0;
2039 }
2040
2041 void socket_notify_service_dead(Socket *s, bool broken) {
2042         assert(s);
2043
2044         /* The service is dead. Dang!
2045          *
2046          * This is strictly for one-instance-for-all-connections
2047          * services. */
2048
2049         if (s->state == SOCKET_RUNNING) {
2050                 log_debug("%s got notified about service death (broken: %s)", UNIT(s)->id, yes_no(broken));
2051                 if (broken)
2052                         socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_BROKEN);
2053                 else
2054                         socket_enter_listening(s);
2055         }
2056 }
2057
2058 void socket_connection_unref(Socket *s) {
2059         assert(s);
2060
2061         /* The service is dead. Yay!
2062          *
2063          * This is strictly for one-instance-per-connection
2064          * services. */
2065
2066         assert(s->n_connections > 0);
2067         s->n_connections--;
2068
2069         log_debug("%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
2070 }
2071
2072 static void socket_reset_failed(Unit *u) {
2073         Socket *s = SOCKET(u);
2074
2075         assert(s);
2076
2077         if (s->state == SOCKET_FAILED)
2078                 socket_set_state(s, SOCKET_DEAD);
2079
2080         s->result = SOCKET_SUCCESS;
2081 }
2082
2083 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
2084         Socket *s = SOCKET(u);
2085         int r = 0;
2086         Set *pid_set = NULL;
2087
2088         assert(s);
2089
2090         if (who == KILL_MAIN) {
2091                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
2092                 return -ESRCH;
2093         }
2094
2095         if (s->control_pid <= 0 && who == KILL_CONTROL) {
2096                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
2097                 return -ESRCH;
2098         }
2099
2100         if (who == KILL_CONTROL || who == KILL_ALL)
2101                 if (s->control_pid > 0)
2102                         if (kill(s->control_pid, signo) < 0)
2103                                 r = -errno;
2104
2105         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
2106                 int q;
2107
2108                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
2109                         return -ENOMEM;
2110
2111                 /* Exclude the control pid from being killed via the cgroup */
2112                 if (s->control_pid > 0)
2113                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
2114                                 r = q;
2115                                 goto finish;
2116                         }
2117
2118                 if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
2119                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
2120                                 r = q;
2121         }
2122
2123 finish:
2124         if (pid_set)
2125                 set_free(pid_set);
2126
2127         return r;
2128 }
2129
2130 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2131         [SOCKET_DEAD] = "dead",
2132         [SOCKET_START_PRE] = "start-pre",
2133         [SOCKET_START_POST] = "start-post",
2134         [SOCKET_LISTENING] = "listening",
2135         [SOCKET_RUNNING] = "running",
2136         [SOCKET_STOP_PRE] = "stop-pre",
2137         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2138         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2139         [SOCKET_STOP_POST] = "stop-post",
2140         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2141         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2142         [SOCKET_FAILED] = "failed"
2143 };
2144
2145 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2146
2147 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2148         [SOCKET_EXEC_START_PRE] = "StartPre",
2149         [SOCKET_EXEC_START_POST] = "StartPost",
2150         [SOCKET_EXEC_STOP_PRE] = "StopPre",
2151         [SOCKET_EXEC_STOP_POST] = "StopPost"
2152 };
2153
2154 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2155
2156 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
2157         [SOCKET_SUCCESS] = "success",
2158         [SOCKET_FAILURE_RESOURCES] = "resources",
2159         [SOCKET_FAILURE_TIMEOUT] = "timeout",
2160         [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
2161         [SOCKET_FAILURE_SIGNAL] = "signal",
2162         [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
2163         [SOCKET_FAILURE_SERVICE_BROKEN] = "service-broken"
2164 };
2165
2166 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
2167
2168 const UnitVTable socket_vtable = {
2169         .suffix = ".socket",
2170         .object_size = sizeof(Socket),
2171         .sections =
2172                 "Unit\0"
2173                 "Socket\0"
2174                 "Install\0",
2175
2176         .init = socket_init,
2177         .done = socket_done,
2178         .load = socket_load,
2179
2180         .kill = socket_kill,
2181
2182         .coldplug = socket_coldplug,
2183
2184         .dump = socket_dump,
2185
2186         .start = socket_start,
2187         .stop = socket_stop,
2188
2189         .serialize = socket_serialize,
2190         .deserialize_item = socket_deserialize_item,
2191
2192         .active_state = socket_active_state,
2193         .sub_state_to_string = socket_sub_state_to_string,
2194
2195         .check_gc = socket_check_gc,
2196
2197         .fd_event = socket_fd_event,
2198         .sigchld_event = socket_sigchld_event,
2199         .timer_event = socket_timer_event,
2200
2201         .reset_failed = socket_reset_failed,
2202
2203         .bus_interface = "org.freedesktop.systemd1.Socket",
2204         .bus_message_handler = bus_socket_message_handler,
2205         .bus_invalidating_properties =  bus_socket_invalidating_properties
2206 };