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