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                 "%sPassSecurity: %s\n"
 421                 "%sTCPCongestion: %s\n",
 422                 prefix, socket_state_to_string(s->state),
 423                 prefix, socket_result_to_string(s->result),
 424                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 425                 prefix, s->backlog,
 426                 prefix, s->socket_mode,
 427                 prefix, s->directory_mode,
 428                 prefix, yes_no(s->keep_alive),
 429                 prefix, yes_no(s->free_bind),
 430                 prefix, yes_no(s->transparent),
 431                 prefix, yes_no(s->broadcast),
 432                 prefix, yes_no(s->pass_cred),
 433                 prefix, yes_no(s->pass_sec),
 434                 prefix, strna(s->tcp_congestion));
 435
 436         if (s->control_pid > 0)
 437                 fprintf(f,
 438                         "%sControl PID: %lu\n",
 439                         prefix, (unsigned long) s->control_pid);
 440
 441         if (s->bind_to_device)
 442                 fprintf(f,
 443                         "%sBindToDevice: %s\n",
 444                         prefix, s->bind_to_device);
 445
 446         if (s->accept)
 447                 fprintf(f,
 448                         "%sAccepted: %u\n"
 449                         "%sNConnections: %u\n"
 450                         "%sMaxConnections: %u\n",
 451                         prefix, s->n_accepted,
 452                         prefix, s->n_connections,
 453                         prefix, s->max_connections);
 454
 455         if (s->priority >= 0)
 456                 fprintf(f,
 457                         "%sPriority: %i\n",
 458                         prefix, s->priority);
 459
 460         if (s->receive_buffer > 0)
 461                 fprintf(f,
 462                         "%sReceiveBuffer: %zu\n",
 463                         prefix, s->receive_buffer);
 464
 465         if (s->send_buffer > 0)
 466                 fprintf(f,
 467                         "%sSendBuffer: %zu\n",
 468                         prefix, s->send_buffer);
 469
 470         if (s->ip_tos >= 0)
 471                 fprintf(f,
 472                         "%sIPTOS: %i\n",
 473                         prefix, s->ip_tos);
 474
 475         if (s->ip_ttl >= 0)
 476                 fprintf(f,
 477                         "%sIPTTL: %i\n",
 478                         prefix, s->ip_ttl);
 479
 480         if (s->pipe_size > 0)
 481                 fprintf(f,
 482                         "%sPipeSize: %zu\n",
 483                         prefix, s->pipe_size);
 484
 485         if (s->mark >= 0)
 486                 fprintf(f,
 487                         "%sMark: %i\n",
 488                         prefix, s->mark);
 489
 490         if (s->mq_maxmsg > 0)
 491                 fprintf(f,
 492                         "%sMessageQueueMaxMessages: %li\n",
 493                         prefix, s->mq_maxmsg);
 494
 495         if (s->mq_msgsize > 0)
 496                 fprintf(f,
 497                         "%sMessageQueueMessageSize: %li\n",
 498                         prefix, s->mq_msgsize);
 499
 500         LIST_FOREACH(port, p, s->ports) {
 501
 502                 if (p->type == SOCKET_SOCKET) {
 503                         const char *t;
 504                         int r;
 505                         char *k = NULL;
 506
 507                         if ((r = socket_address_print(&p->address, &k)) < 0)
 508                                 t = strerror(-r);
 509                         else
 510                                 t = k;
 511
 512                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
 513                         free(k);
 514                 } else if (p->type == SOCKET_SPECIAL)
 515                         fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
 516                 else if (p->type == SOCKET_MQUEUE)
 517                         fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
 518                 else
 519                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 520         }
 521
 522         exec_context_dump(&s->exec_context, f, prefix);
 523
 524         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 525                 if (!s->exec_command[c])
 526                         continue;
 527
 528                 fprintf(f, "%s-> %s:\n",
 529                         prefix, socket_exec_command_to_string(c));
 530
 531                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 532         }
 533
 534         free(p2);
 535 }
 536
 537 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 538         socklen_t l;
 539         char *r;
 540         union {
 541                 struct sockaddr sa;
 542                 struct sockaddr_un un;
 543                 struct sockaddr_in in;
 544                 struct sockaddr_in6 in6;
 545                 struct sockaddr_storage storage;
 546         } local, remote;
 547
 548         assert(fd >= 0);
 549         assert(instance);
 550
 551         l = sizeof(local);
 552         if (getsockname(fd, &local.sa, &l) < 0)
 553                 return -errno;
 554
 555         l = sizeof(remote);
 556         if (getpeername(fd, &remote.sa, &l) < 0)
 557                 return -errno;
 558
 559         switch (local.sa.sa_family) {
 560
 561         case AF_INET: {
 562                 uint32_t
 563                         a = ntohl(local.in.sin_addr.s_addr),
 564                         b = ntohl(remote.in.sin_addr.s_addr);
 565
 566                 if (asprintf(&r,
 567                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 568                              nr,
 569                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 570                              ntohs(local.in.sin_port),
 571                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 572                              ntohs(remote.in.sin_port)) < 0)
 573                         return -ENOMEM;
 574
 575                 break;
 576         }
 577
 578         case AF_INET6: {
 579                 static const char ipv4_prefix[] = {
 580                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 581                 };
 582
 583                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 584                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 585                         const uint8_t
 586                                 *a = local.in6.sin6_addr.s6_addr+12,
 587                                 *b = remote.in6.sin6_addr.s6_addr+12;
 588
 589                         if (asprintf(&r,
 590                                      "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 591                                      nr,
 592                                      a[0], a[1], a[2], a[3],
 593                                      ntohs(local.in6.sin6_port),
 594                                      b[0], b[1], b[2], b[3],
 595                                      ntohs(remote.in6.sin6_port)) < 0)
 596                                 return -ENOMEM;
 597                 } else {
 598                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 599
 600                         if (asprintf(&r,
 601                                      "%u-%s:%u-%s:%u",
 602                                      nr,
 603                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 604                                      ntohs(local.in6.sin6_port),
 605                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 606                                      ntohs(remote.in6.sin6_port)) < 0)
 607                                 return -ENOMEM;
 608                 }
 609
 610                 break;
 611         }
 612
 613         case AF_UNIX: {
 614                 struct ucred ucred;
 615
 616                 l = sizeof(ucred);
 617                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 618                         return -errno;
 619
 620                 if (asprintf(&r,
 621                              "%u-%lu-%lu",
 622                              nr,
 623                              (unsigned long) ucred.pid,
 624                              (unsigned long) ucred.uid) < 0)
 625                         return -ENOMEM;
 626
 627                 break;
 628         }
 629
 630         default:
 631                 assert_not_reached("Unhandled socket type.");
 632         }
 633
 634         *instance = r;
 635         return 0;
 636 }
 637
 638 static void socket_close_fds(Socket *s) {
 639         SocketPort *p;
 640
 641         assert(s);
 642
 643         LIST_FOREACH(port, p, s->ports) {
 644                 if (p->fd < 0)
 645                         continue;
 646
 647                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 648                 close_nointr_nofail(p->fd);
 649
 650                 /* One little note: we should never delete any sockets
 651                  * in the file system here! After all some other
 652                  * process we spawned might still have a reference of
 653                  * this fd and wants to continue to use it. Therefore
 654                  * we delete sockets in the file system before we
 655                  * create a new one, not after we stopped using
 656                  * one! */
 657
 658                 p->fd = -1;
 659         }
 660 }
 661
 662 static void socket_apply_socket_options(Socket *s, int fd) {
 663         assert(s);
 664         assert(fd >= 0);
 665
 666         if (s->keep_alive) {
 667                 int b = s->keep_alive;
 668                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 669                         log_warning("SO_KEEPALIVE failed: %m");
 670         }
 671
 672         if (s->broadcast) {
 673                 int one = 1;
 674                 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
 675                         log_warning("SO_BROADCAST failed: %m");
 676         }
 677
 678         if (s->pass_cred) {
 679                 int one = 1;
 680                 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
 681                         log_warning("SO_PASSCRED failed: %m");
 682         }
 683
 684         if (s->pass_sec) {
 685                 int one = 1;
 686                 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
 687                         log_warning("SO_PASSSEC failed: %m");
 688         }
 689
 690         if (s->priority >= 0)
 691                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 692                         log_warning("SO_PRIORITY failed: %m");
 693
 694         if (s->receive_buffer > 0) {
 695                 int value = (int) s->receive_buffer;
 696
 697                 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
 698
 699                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
 700                         if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 701                                 log_warning("SO_RCVBUF failed: %m");
 702         }
 703
 704         if (s->send_buffer > 0) {
 705                 int value = (int) s->send_buffer;
 706                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
 707                         if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 708                                 log_warning("SO_SNDBUF failed: %m");
 709         }
 710
 711         if (s->mark >= 0)
 712                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 713                         log_warning("SO_MARK failed: %m");
 714
 715         if (s->ip_tos >= 0)
 716                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 717                         log_warning("IP_TOS failed: %m");
 718
 719         if (s->ip_ttl >= 0) {
 720                 int r, x;
 721
 722                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 723
 724                 if (socket_ipv6_is_supported())
 725                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 726                 else {
 727                         x = -1;
 728                         errno = EAFNOSUPPORT;
 729                 }
 730
 731                 if (r < 0 && x < 0)
 732                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 733         }
 734
 735         if (s->tcp_congestion)
 736                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 737                         log_warning("TCP_CONGESTION failed: %m");
 738 }
 739
 740 static void socket_apply_fifo_options(Socket *s, int fd) {
 741         assert(s);
 742         assert(fd >= 0);
 743
 744         if (s->pipe_size > 0)
 745                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 746                         log_warning("F_SETPIPE_SZ: %m");
 747 }
 748
 749 static int fifo_address_create(
 750                 const char *path,
 751                 mode_t directory_mode,
 752                 mode_t socket_mode,
 753                 int *_fd) {
 754
 755         int fd = -1, r = 0;
 756         struct stat st;
 757         mode_t old_mask;
 758
 759         assert(path);
 760         assert(_fd);
 761
 762         mkdir_parents(path, directory_mode);
 763
 764         if ((r = label_fifofile_set(path)) < 0)
 765                 goto fail;
 766
 767         /* Enforce the right access mode for the fifo */
 768         old_mask = umask(~ socket_mode);
 769
 770         /* Include the original umask in our mask */
 771         umask(~socket_mode | old_mask);
 772
 773         r = mkfifo(path, socket_mode);
 774         umask(old_mask);
 775
 776         if (r < 0 && errno != EEXIST) {
 777                 r = -errno;
 778                 goto fail;
 779         }
 780
 781         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 782                 r = -errno;
 783                 goto fail;
 784         }
 785
 786         label_file_clear();
 787
 788         if (fstat(fd, &st) < 0) {
 789                 r = -errno;
 790                 goto fail;
 791         }
 792
 793         if (!S_ISFIFO(st.st_mode) ||
 794             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 795             st.st_uid != getuid() ||
 796             st.st_gid != getgid()) {
 797
 798                 r = -EEXIST;
 799                 goto fail;
 800         }
 801
 802         *_fd = fd;
 803         return 0;
 804
 805 fail:
 806         label_file_clear();
 807
 808         if (fd >= 0)
 809                 close_nointr_nofail(fd);
 810
 811         return r;
 812 }
 813
 814 static int special_address_create(
 815                 const char *path,
 816                 int *_fd) {
 817
 818         int fd = -1, r = 0;
 819         struct stat st;
 820
 821         assert(path);
 822         assert(_fd);
 823
 824         if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 825                 r = -errno;
 826                 goto fail;
 827         }
 828
 829         if (fstat(fd, &st) < 0) {
 830                 r = -errno;
 831                 goto fail;
 832         }
 833
 834         /* Check whether this is a /proc, /sys or /dev file or char device */
 835         if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
 836                 r = -EEXIST;
 837                 goto fail;
 838         }
 839
 840         *_fd = fd;
 841         return 0;
 842
 843 fail:
 844         if (fd >= 0)
 845                 close_nointr_nofail(fd);
 846
 847         return r;
 848 }
 849
 850 static int mq_address_create(
 851                 const char *path,
 852                 mode_t mq_mode,
 853                 long maxmsg,
 854                 long msgsize,
 855                 int *_fd) {
 856
 857         int fd = -1, r = 0;
 858         struct stat st;
 859         mode_t old_mask;
 860         struct mq_attr _attr, *attr = NULL;
 861
 862         assert(path);
 863         assert(_fd);
 864
 865         if (maxmsg > 0 && msgsize > 0) {
 866                 zero(_attr);
 867                 _attr.mq_flags = O_NONBLOCK;
 868                 _attr.mq_maxmsg = maxmsg;
 869                 _attr.mq_msgsize = msgsize;
 870                 attr = &_attr;
 871         }
 872
 873         /* Enforce the right access mode for the mq */
 874         old_mask = umask(~ mq_mode);
 875
 876         /* Include the original umask in our mask */
 877         umask(~mq_mode | old_mask);
 878
 879         fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
 880         umask(old_mask);
 881
 882         if (fd < 0) {
 883                 r = -errno;
 884                 goto fail;
 885         }
 886
 887         if (fstat(fd, &st) < 0) {
 888                 r = -errno;
 889                 goto fail;
 890         }
 891
 892         if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
 893             st.st_uid != getuid() ||
 894             st.st_gid != getgid()) {
 895
 896                 r = -EEXIST;
 897                 goto fail;
 898         }
 899
 900         *_fd = fd;
 901         return 0;
 902
 903 fail:
 904         if (fd >= 0)
 905                 close_nointr_nofail(fd);
 906
 907         return r;
 908 }
 909
 910 static int socket_open_fds(Socket *s) {
 911         SocketPort *p;
 912         int r;
 913         char *label = NULL;
 914         bool know_label = false;
 915
 916         assert(s);
 917
 918         LIST_FOREACH(port, p, s->ports) {
 919
 920                 if (p->fd >= 0)
 921                         continue;
 922
 923                 if (p->type == SOCKET_SOCKET) {
 924
 925                         if (!know_label) {
 926
 927                                 if ((r = socket_instantiate_service(s)) < 0)
 928                                         return r;
 929
 930                                 if (UNIT_DEREF(s->service) &&
 931                                     SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
 932                                         r = label_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
 933
 934                                         if (r < 0) {
 935                                                 if (r != -EPERM)
 936                                                         return r;
 937                                         }
 938                                 }
 939
 940                                 know_label = true;
 941                         }
 942
 943                         if ((r = socket_address_listen(
 944                                              &p->address,
 945                                              s->backlog,
 946                                              s->bind_ipv6_only,
 947                                              s->bind_to_device,
 948                                              s->free_bind,
 949                                              s->transparent,
 950                                              s->directory_mode,
 951                                              s->socket_mode,
 952                                              label,
 953                                              &p->fd)) < 0)
 954                                 goto rollback;
 955
 956                         socket_apply_socket_options(s, p->fd);
 957
 958                 } else  if (p->type == SOCKET_SPECIAL) {
 959
 960                         if ((r = special_address_create(
 961                                              p->path,
 962                                              &p->fd)) < 0)
 963                                 goto rollback;
 964
 965                 } else  if (p->type == SOCKET_FIFO) {
 966
 967                         if ((r = fifo_address_create(
 968                                              p->path,
 969                                              s->directory_mode,
 970                                              s->socket_mode,
 971                                              &p->fd)) < 0)
 972                                 goto rollback;
 973
 974                         socket_apply_fifo_options(s, p->fd);
 975                 } else if (p->type == SOCKET_MQUEUE) {
 976
 977                         if ((r = mq_address_create(
 978                                              p->path,
 979                                              s->socket_mode,
 980                                              s->mq_maxmsg,
 981                                              s->mq_msgsize,
 982                                              &p->fd)) < 0)
 983                                 goto rollback;
 984                 } else
 985                         assert_not_reached("Unknown port type");
 986         }
 987
 988         label_free(label);
 989         return 0;
 990
 991 rollback:
 992         socket_close_fds(s);
 993         label_free(label);
 994         return r;
 995 }
 996
 997 static void socket_unwatch_fds(Socket *s) {
 998         SocketPort *p;
 999
1000         assert(s);
1001
1002         LIST_FOREACH(port, p, s->ports) {
1003                 if (p->fd < 0)
1004                         continue;
1005
1006                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
1007         }
1008 }
1009
1010 static int socket_watch_fds(Socket *s) {
1011         SocketPort *p;
1012         int r;
1013
1014         assert(s);
1015
1016         LIST_FOREACH(port, p, s->ports) {
1017                 if (p->fd < 0)
1018                         continue;
1019
1020                 p->fd_watch.socket_accept =
1021                         s->accept &&
1022                         p->type == SOCKET_SOCKET &&
1023                         socket_address_can_accept(&p->address);
1024
1025                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
1026                         goto fail;
1027         }
1028
1029         return 0;
1030
1031 fail:
1032         socket_unwatch_fds(s);
1033         return r;
1034 }
1035
1036 static void socket_set_state(Socket *s, SocketState state) {
1037         SocketState old_state;
1038         assert(s);
1039
1040         old_state = s->state;
1041         s->state = state;
1042
1043         if (state != SOCKET_START_PRE &&
1044             state != SOCKET_START_POST &&
1045             state != SOCKET_STOP_PRE &&
1046             state != SOCKET_STOP_PRE_SIGTERM &&
1047             state != SOCKET_STOP_PRE_SIGKILL &&
1048             state != SOCKET_STOP_POST &&
1049             state != SOCKET_FINAL_SIGTERM &&
1050             state != SOCKET_FINAL_SIGKILL) {
1051                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1052                 socket_unwatch_control_pid(s);
1053                 s->control_command = NULL;
1054                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1055         }
1056
1057         if (state != SOCKET_LISTENING)
1058                 socket_unwatch_fds(s);
1059
1060         if (state != SOCKET_START_POST &&
1061             state != SOCKET_LISTENING &&
1062             state != SOCKET_RUNNING &&
1063             state != SOCKET_STOP_PRE &&
1064             state != SOCKET_STOP_PRE_SIGTERM &&
1065             state != SOCKET_STOP_PRE_SIGKILL)
1066                 socket_close_fds(s);
1067
1068         if (state != old_state)
1069                 log_debug("%s changed %s -> %s",
1070                           UNIT(s)->id,
1071                           socket_state_to_string(old_state),
1072                           socket_state_to_string(state));
1073
1074         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1075 }
1076
1077 static int socket_coldplug(Unit *u) {
1078         Socket *s = SOCKET(u);
1079         int r;
1080
1081         assert(s);
1082         assert(s->state == SOCKET_DEAD);
1083
1084         if (s->deserialized_state != s->state) {
1085
1086                 if (s->deserialized_state == SOCKET_START_PRE ||
1087                     s->deserialized_state == SOCKET_START_POST ||
1088                     s->deserialized_state == SOCKET_STOP_PRE ||
1089                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1090                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
1091                     s->deserialized_state == SOCKET_STOP_POST ||
1092                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
1093                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
1094
1095                         if (s->control_pid <= 0)
1096                                 return -EBADMSG;
1097
1098                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
1099                                 return r;
1100
1101                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1102                                 return r;
1103                 }
1104
1105                 if (s->deserialized_state == SOCKET_START_POST ||
1106                     s->deserialized_state == SOCKET_LISTENING ||
1107                     s->deserialized_state == SOCKET_RUNNING ||
1108                     s->deserialized_state == SOCKET_STOP_PRE ||
1109                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1110                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
1111                         if ((r = socket_open_fds(s)) < 0)
1112                                 return r;
1113
1114                 if (s->deserialized_state == SOCKET_LISTENING)
1115                         if ((r = socket_watch_fds(s)) < 0)
1116                                 return r;
1117
1118                 socket_set_state(s, s->deserialized_state);
1119         }
1120
1121         return 0;
1122 }
1123
1124 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1125         pid_t pid;
1126         int r;
1127         char **argv;
1128
1129         assert(s);
1130         assert(c);
1131         assert(_pid);
1132
1133         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1134                 goto fail;
1135
1136         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
1137                 r = -ENOMEM;
1138                 goto fail;
1139         }
1140
1141         r = exec_spawn(c,
1142                        argv,
1143                        &s->exec_context,
1144                        NULL, 0,
1145                        UNIT(s)->manager->environment,
1146                        true,
1147                        true,
1148                        true,
1149                        UNIT(s)->manager->confirm_spawn,
1150                        UNIT(s)->cgroup_bondings,
1151                        UNIT(s)->cgroup_attributes,
1152                        &pid);
1153
1154         strv_free(argv);
1155         if (r < 0)
1156                 goto fail;
1157
1158         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
1159                 /* FIXME: we need to do something here */
1160                 goto fail;
1161
1162         *_pid = pid;
1163
1164         return 0;
1165
1166 fail:
1167         unit_unwatch_timer(UNIT(s), &s->timer_watch);
1168
1169         return r;
1170 }
1171
1172 static void socket_enter_dead(Socket *s, SocketResult f) {
1173         assert(s);
1174
1175         if (f != SOCKET_SUCCESS)
1176                 s->result = f;
1177
1178         socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1179 }
1180
1181 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1182
1183 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1184         int r;
1185         assert(s);
1186
1187         if (f != SOCKET_SUCCESS)
1188                 s->result = f;
1189
1190         socket_unwatch_control_pid(s);
1191
1192         s->control_command_id = SOCKET_EXEC_STOP_POST;
1193
1194         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1195                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1196                         goto fail;
1197
1198                 socket_set_state(s, SOCKET_STOP_POST);
1199         } else
1200                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1201
1202         return;
1203
1204 fail:
1205         log_warning("%s failed to run 'stop-post' task: %s", UNIT(s)->id, strerror(-r));
1206         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1207 }
1208
1209 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1210         int r;
1211         Set *pid_set = NULL;
1212         bool wait_for_exit = false;
1213
1214         assert(s);
1215
1216         if (f != SOCKET_SUCCESS)
1217                 s->result = f;
1218
1219         if (s->exec_context.kill_mode != KILL_NONE) {
1220                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1221
1222                 if (s->control_pid > 0) {
1223                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1224
1225                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1226                         else
1227                                 wait_for_exit = true;
1228                 }
1229
1230                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1231
1232                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1233                                 r = -ENOMEM;
1234                                 goto fail;
1235                         }
1236
1237                         /* Exclude the control pid from being killed via the cgroup */
1238                         if (s->control_pid > 0)
1239                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1240                                         goto fail;
1241
1242                         if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 0) {
1243                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1244                                         log_warning("Failed to kill control group: %s", strerror(-r));
1245                         } else if (r > 0)
1246                                 wait_for_exit = true;
1247
1248                         set_free(pid_set);
1249                         pid_set = NULL;
1250                 }
1251         }
1252
1253         if (wait_for_exit) {
1254                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1255                         goto fail;
1256
1257                 socket_set_state(s, state);
1258         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1259                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1260         else
1261                 socket_enter_dead(s, SOCKET_SUCCESS);
1262
1263         return;
1264
1265 fail:
1266         log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
1267
1268         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1269                 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1270         else
1271                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1272
1273         if (pid_set)
1274                 set_free(pid_set);
1275 }
1276
1277 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1278         int r;
1279         assert(s);
1280
1281         if (f != SOCKET_SUCCESS)
1282                 s->result = f;
1283
1284         socket_unwatch_control_pid(s);
1285
1286         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1287
1288         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1289                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1290                         goto fail;
1291
1292                 socket_set_state(s, SOCKET_STOP_PRE);
1293         } else
1294                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1295
1296         return;
1297
1298 fail:
1299         log_warning("%s failed to run 'stop-pre' task: %s", UNIT(s)->id, strerror(-r));
1300         socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1301 }
1302
1303 static void socket_enter_listening(Socket *s) {
1304         int r;
1305         assert(s);
1306
1307         r = socket_watch_fds(s);
1308         if (r < 0) {
1309                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1310                 goto fail;
1311         }
1312
1313         socket_set_state(s, SOCKET_LISTENING);
1314         return;
1315
1316 fail:
1317         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1318 }
1319
1320 static void socket_enter_start_post(Socket *s) {
1321         int r;
1322         assert(s);
1323
1324         r = socket_open_fds(s);
1325         if (r < 0) {
1326                 log_warning("%s failed to listen on sockets: %s", UNIT(s)->id, strerror(-r));
1327                 goto fail;
1328         }
1329
1330         socket_unwatch_control_pid(s);
1331
1332         s->control_command_id = SOCKET_EXEC_START_POST;
1333
1334         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1335                 r = socket_spawn(s, s->control_command, &s->control_pid);
1336                 if (r < 0) {
1337                         log_warning("%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
1338                         goto fail;
1339                 }
1340
1341                 socket_set_state(s, SOCKET_START_POST);
1342         } else
1343                 socket_enter_listening(s);
1344
1345         return;
1346
1347 fail:
1348         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1349 }
1350
1351 static void socket_enter_start_pre(Socket *s) {
1352         int r;
1353         assert(s);
1354
1355         socket_unwatch_control_pid(s);
1356
1357         s->control_command_id = SOCKET_EXEC_START_PRE;
1358
1359         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1360                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1361                         goto fail;
1362
1363                 socket_set_state(s, SOCKET_START_PRE);
1364         } else
1365                 socket_enter_start_post(s);
1366
1367         return;
1368
1369 fail:
1370         log_warning("%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
1371         socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1372 }
1373
1374 static void socket_enter_running(Socket *s, int cfd) {
1375         int r;
1376         DBusError error;
1377
1378         assert(s);
1379         dbus_error_init(&error);
1380
1381         /* We don't take connections anymore if we are supposed to
1382          * shut down anyway */
1383         if (unit_pending_inactive(UNIT(s))) {
1384                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
1385
1386                 if (cfd >= 0)
1387                         close_nointr_nofail(cfd);
1388                 else  {
1389                         /* Flush all sockets by closing and reopening them */
1390                         socket_close_fds(s);
1391
1392                         r = socket_watch_fds(s);
1393                         if (r < 0) {
1394                                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1395                                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1396                         }
1397                 }
1398
1399                 return;
1400         }
1401
1402         if (cfd < 0) {
1403                 Iterator i;
1404                 Unit *u;
1405                 bool pending = false;
1406
1407                 /* If there's already a start pending don't bother to
1408                  * do anything */
1409                 SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
1410                         if (unit_pending_active(u)) {
1411                                 pending = true;
1412                                 break;
1413                         }
1414
1415                 if (!pending) {
1416                         r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
1417                         if (r < 0)
1418                                 goto fail;
1419                 }
1420
1421                 socket_set_state(s, SOCKET_RUNNING);
1422         } else {
1423                 char *prefix, *instance = NULL, *name;
1424                 Service *service;
1425
1426                 if (s->n_connections >= s->max_connections) {
1427                         log_warning("Too many incoming connections (%u)", s->n_connections);
1428                         close_nointr_nofail(cfd);
1429                         return;
1430                 }
1431
1432                 r = socket_instantiate_service(s);
1433                 if (r < 0)
1434                         goto fail;
1435
1436                 r = instance_from_socket(cfd, s->n_accepted, &instance);
1437                 if (r < 0) {
1438                         if (r != -ENOTCONN)
1439                                 goto fail;
1440
1441                         /* ENOTCONN is legitimate if TCP RST was received.
1442                          * This connection is over, but the socket unit lives on. */
1443                         close_nointr_nofail(cfd);
1444                         return;
1445                 }
1446
1447                 prefix = unit_name_to_prefix(UNIT(s)->id);
1448                 if (!prefix) {
1449                         free(instance);
1450                         r = -ENOMEM;
1451                         goto fail;
1452                 }
1453
1454                 name = unit_name_build(prefix, instance, ".service");
1455                 free(prefix);
1456                 free(instance);
1457
1458                 if (!name) {
1459                         r = -ENOMEM;
1460                         goto fail;
1461                 }
1462
1463                 r = unit_add_name(UNIT_DEREF(s->service), name);
1464                 if (r < 0) {
1465                         free(name);
1466                         goto fail;
1467                 }
1468
1469                 service = SERVICE(UNIT_DEREF(s->service));
1470                 unit_ref_unset(&s->service);
1471                 s->n_accepted ++;
1472
1473                 UNIT(service)->no_gc = false;
1474
1475                 unit_choose_id(UNIT(service), name);
1476                 free(name);
1477
1478                 r = service_set_socket_fd(service, cfd, s);
1479                 if (r < 0)
1480                         goto fail;
1481
1482                 cfd = -1;
1483                 s->n_connections ++;
1484
1485                 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
1486                 if (r < 0)
1487                         goto fail;
1488
1489                 /* Notify clients about changed counters */
1490                 unit_add_to_dbus_queue(UNIT(s));
1491         }
1492
1493         return;
1494
1495 fail:
1496         log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
1497
1498         if (cfd >= 0)
1499                 close_nointr_nofail(cfd);
1500
1501         dbus_error_free(&error);
1502 }
1503
1504 static void socket_run_next(Socket *s) {
1505         int r;
1506
1507         assert(s);
1508         assert(s->control_command);
1509         assert(s->control_command->command_next);
1510
1511         socket_unwatch_control_pid(s);
1512
1513         s->control_command = s->control_command->command_next;
1514
1515         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1516                 goto fail;
1517
1518         return;
1519
1520 fail:
1521         log_warning("%s failed to run next task: %s", UNIT(s)->id, strerror(-r));
1522
1523         if (s->state == SOCKET_START_POST)
1524                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1525         else if (s->state == SOCKET_STOP_POST)
1526                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1527         else
1528                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1529 }
1530
1531 static int socket_start(Unit *u) {
1532         Socket *s = SOCKET(u);
1533
1534         assert(s);
1535
1536         /* We cannot fulfill this request right now, try again later
1537          * please! */
1538         if (s->state == SOCKET_STOP_PRE ||
1539             s->state == SOCKET_STOP_PRE_SIGKILL ||
1540             s->state == SOCKET_STOP_PRE_SIGTERM ||
1541             s->state == SOCKET_STOP_POST ||
1542             s->state == SOCKET_FINAL_SIGTERM ||
1543             s->state == SOCKET_FINAL_SIGKILL)
1544                 return -EAGAIN;
1545
1546         if (s->state == SOCKET_START_PRE ||
1547             s->state == SOCKET_START_POST)
1548                 return 0;
1549
1550         /* Cannot run this without the service being around */
1551         if (UNIT_DEREF(s->service)) {
1552                 Service *service;
1553
1554                 service = SERVICE(UNIT_DEREF(s->service));
1555
1556                 if (UNIT(service)->load_state != UNIT_LOADED) {
1557                         log_error("Socket service %s not loaded, refusing.", UNIT(service)->id);
1558                         return -ENOENT;
1559                 }
1560
1561                 /* If the service is already active we cannot start the
1562                  * socket */
1563                 if (service->state != SERVICE_DEAD &&
1564                     service->state != SERVICE_FAILED &&
1565                     service->state != SERVICE_AUTO_RESTART) {
1566                         log_error("Socket service %s already active, refusing.", UNIT(service)->id);
1567                         return -EBUSY;
1568                 }
1569
1570 #ifdef HAVE_SYSV_COMPAT
1571                 if (service->sysv_path) {
1572                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1573                         return -ENOENT;
1574                 }
1575 #endif
1576         }
1577
1578         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1579
1580         s->result = SOCKET_SUCCESS;
1581         socket_enter_start_pre(s);
1582         return 0;
1583 }
1584
1585 static int socket_stop(Unit *u) {
1586         Socket *s = SOCKET(u);
1587
1588         assert(s);
1589
1590         /* Already on it */
1591         if (s->state == SOCKET_STOP_PRE ||
1592             s->state == SOCKET_STOP_PRE_SIGTERM ||
1593             s->state == SOCKET_STOP_PRE_SIGKILL ||
1594             s->state == SOCKET_STOP_POST ||
1595             s->state == SOCKET_FINAL_SIGTERM ||
1596             s->state == SOCKET_FINAL_SIGKILL)
1597                 return 0;
1598
1599         /* If there's already something running we go directly into
1600          * kill mode. */
1601         if (s->state == SOCKET_START_PRE ||
1602             s->state == SOCKET_START_POST) {
1603                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
1604                 return -EAGAIN;
1605         }
1606
1607         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1608
1609         socket_enter_stop_pre(s, SOCKET_SUCCESS);
1610         return 0;
1611 }
1612
1613 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1614         Socket *s = SOCKET(u);
1615         SocketPort *p;
1616         int r;
1617
1618         assert(u);
1619         assert(f);
1620         assert(fds);
1621
1622         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1623         unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
1624         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1625
1626         if (s->control_pid > 0)
1627                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1628
1629         if (s->control_command_id >= 0)
1630                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1631
1632         LIST_FOREACH(port, p, s->ports) {
1633                 int copy;
1634
1635                 if (p->fd < 0)
1636                         continue;
1637
1638                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1639                         return copy;
1640
1641                 if (p->type == SOCKET_SOCKET) {
1642                         char *t;
1643
1644                         if ((r = socket_address_print(&p->address, &t)) < 0)
1645                                 return r;
1646
1647                         if (socket_address_family(&p->address) == AF_NETLINK)
1648                                 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
1649                         else
1650                                 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1651                         free(t);
1652                 } else if (p->type == SOCKET_SPECIAL)
1653                         unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
1654                 else {
1655                         assert(p->type == SOCKET_FIFO);
1656                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1657                 }
1658         }
1659
1660         return 0;
1661 }
1662
1663 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1664         Socket *s = SOCKET(u);
1665
1666         assert(u);
1667         assert(key);
1668         assert(value);
1669         assert(fds);
1670
1671         if (streq(key, "state")) {
1672                 SocketState state;
1673
1674                 if ((state = socket_state_from_string(value)) < 0)
1675                         log_debug("Failed to parse state value %s", value);
1676                 else
1677                         s->deserialized_state = state;
1678         } else if (streq(key, "result")) {
1679                 SocketResult f;
1680
1681                 f = socket_result_from_string(value);
1682                 if (f < 0)
1683                         log_debug("Failed to parse result value %s", value);
1684                 else if (f != SOCKET_SUCCESS)
1685                         s->result = f;
1686
1687         } else if (streq(key, "n-accepted")) {
1688                 unsigned k;
1689
1690                 if (safe_atou(value, &k) < 0)
1691                         log_debug("Failed to parse n-accepted value %s", value);
1692                 else
1693                         s->n_accepted += k;
1694         } else if (streq(key, "control-pid")) {
1695                 pid_t pid;
1696
1697                 if (parse_pid(value, &pid) < 0)
1698                         log_debug("Failed to parse control-pid value %s", value);
1699                 else
1700                         s->control_pid = pid;
1701         } else if (streq(key, "control-command")) {
1702                 SocketExecCommand id;
1703
1704                 if ((id = socket_exec_command_from_string(value)) < 0)
1705                         log_debug("Failed to parse exec-command value %s", value);
1706                 else {
1707                         s->control_command_id = id;
1708                         s->control_command = s->exec_command[id];
1709                 }
1710         } else if (streq(key, "fifo")) {
1711                 int fd, skip = 0;
1712                 SocketPort *p;
1713
1714                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1715                         log_debug("Failed to parse fifo value %s", value);
1716                 else {
1717
1718                         LIST_FOREACH(port, p, s->ports)
1719                                 if (p->type == SOCKET_FIFO &&
1720                                     streq_ptr(p->path, value+skip))
1721                                         break;
1722
1723                         if (p) {
1724                                 if (p->fd >= 0)
1725                                         close_nointr_nofail(p->fd);
1726                                 p->fd = fdset_remove(fds, fd);
1727                         }
1728                 }
1729
1730         } else if (streq(key, "special")) {
1731                 int fd, skip = 0;
1732                 SocketPort *p;
1733
1734                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1735                         log_debug("Failed to parse special value %s", value);
1736                 else {
1737
1738                         LIST_FOREACH(port, p, s->ports)
1739                                 if (p->type == SOCKET_SPECIAL &&
1740                                     streq_ptr(p->path, value+skip))
1741                                         break;
1742
1743                         if (p) {
1744                                 if (p->fd >= 0)
1745                                         close_nointr_nofail(p->fd);
1746                                 p->fd = fdset_remove(fds, fd);
1747                         }
1748                 }
1749
1750         } else if (streq(key, "socket")) {
1751                 int fd, type, skip = 0;
1752                 SocketPort *p;
1753
1754                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1755                         log_debug("Failed to parse socket value %s", value);
1756                 else {
1757
1758                         LIST_FOREACH(port, p, s->ports)
1759                                 if (socket_address_is(&p->address, value+skip, type))
1760                                         break;
1761
1762                         if (p) {
1763                                 if (p->fd >= 0)
1764                                         close_nointr_nofail(p->fd);
1765                                 p->fd = fdset_remove(fds, fd);
1766                         }
1767                 }
1768
1769         } else if (streq(key, "netlink")) {
1770                 int fd, skip = 0;
1771                 SocketPort *p;
1772
1773                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1774                         log_debug("Failed to parse socket value %s", value);
1775                 else {
1776
1777                         LIST_FOREACH(port, p, s->ports)
1778                                 if (socket_address_is_netlink(&p->address, value+skip))
1779                                         break;
1780
1781                         if (p) {
1782                                 if (p->fd >= 0)
1783                                         close_nointr_nofail(p->fd);
1784                                 p->fd = fdset_remove(fds, fd);
1785                         }
1786                 }
1787
1788         } else
1789                 log_debug("Unknown serialization key '%s'", key);
1790
1791         return 0;
1792 }
1793
1794 static UnitActiveState socket_active_state(Unit *u) {
1795         assert(u);
1796
1797         return state_translation_table[SOCKET(u)->state];
1798 }
1799
1800 static const char *socket_sub_state_to_string(Unit *u) {
1801         assert(u);
1802
1803         return socket_state_to_string(SOCKET(u)->state);
1804 }
1805
1806 static bool socket_check_gc(Unit *u) {
1807         Socket *s = SOCKET(u);
1808
1809         assert(u);
1810
1811         return s->n_connections > 0;
1812 }
1813
1814 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1815         Socket *s = SOCKET(u);
1816         int cfd = -1;
1817
1818         assert(s);
1819         assert(fd >= 0);
1820
1821         if (s->state != SOCKET_LISTENING)
1822                 return;
1823
1824         log_debug("Incoming traffic on %s", u->id);
1825
1826         if (events != EPOLLIN) {
1827
1828                 if (events & EPOLLHUP)
1829                         log_error("%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.", u->id);
1830                 else
1831                         log_error("%s: Got unexpected poll event (0x%x) on socket.", u->id, events);
1832
1833                 goto fail;
1834         }
1835
1836         if (w->socket_accept) {
1837                 for (;;) {
1838
1839                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1840
1841                                 if (errno == EINTR)
1842                                         continue;
1843
1844                                 log_error("Failed to accept socket: %m");
1845                                 goto fail;
1846                         }
1847
1848                         break;
1849                 }
1850
1851                 socket_apply_socket_options(s, cfd);
1852         }
1853
1854         socket_enter_running(s, cfd);
1855         return;
1856
1857 fail:
1858         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1859 }
1860
1861 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1862         Socket *s = SOCKET(u);
1863         SocketResult f;
1864
1865         assert(s);
1866         assert(pid >= 0);
1867
1868         if (pid != s->control_pid)
1869                 return;
1870
1871         s->control_pid = 0;
1872
1873         if (is_clean_exit(code, status))
1874                 f = SOCKET_SUCCESS;
1875         else if (code == CLD_EXITED)
1876                 f = SOCKET_FAILURE_EXIT_CODE;
1877         else if (code == CLD_KILLED)
1878                 f = SOCKET_FAILURE_SIGNAL;
1879         else if (code == CLD_DUMPED)
1880                 f = SOCKET_FAILURE_CORE_DUMP;
1881         else
1882                 assert_not_reached("Unknown code");
1883
1884         if (s->control_command) {
1885                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1886
1887                 if (s->control_command->ignore)
1888                         f = SOCKET_SUCCESS;
1889         }
1890
1891         log_full(f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1892                  "%s control process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1893
1894         if (f != SOCKET_SUCCESS)
1895                 s->result = f;
1896
1897         if (s->control_command &&
1898             s->control_command->command_next &&
1899             f == SOCKET_SUCCESS) {
1900
1901                 log_debug("%s running next command for state %s", u->id, socket_state_to_string(s->state));
1902                 socket_run_next(s);
1903         } else {
1904                 s->control_command = NULL;
1905                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1906
1907                 /* No further commands for this step, so let's figure
1908                  * out what to do next */
1909
1910                 log_debug("%s got final SIGCHLD for state %s", u->id, socket_state_to_string(s->state));
1911
1912                 switch (s->state) {
1913
1914                 case SOCKET_START_PRE:
1915                         if (f == SOCKET_SUCCESS)
1916                                 socket_enter_start_post(s);
1917                         else
1918                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
1919                         break;
1920
1921                 case SOCKET_START_POST:
1922                         if (f == SOCKET_SUCCESS)
1923                                 socket_enter_listening(s);
1924                         else
1925                                 socket_enter_stop_pre(s, f);
1926                         break;
1927
1928                 case SOCKET_STOP_PRE:
1929                 case SOCKET_STOP_PRE_SIGTERM:
1930                 case SOCKET_STOP_PRE_SIGKILL:
1931                         socket_enter_stop_post(s, f);
1932                         break;
1933
1934                 case SOCKET_STOP_POST:
1935                 case SOCKET_FINAL_SIGTERM:
1936                 case SOCKET_FINAL_SIGKILL:
1937                         socket_enter_dead(s, f);
1938                         break;
1939
1940                 default:
1941                         assert_not_reached("Uh, control process died at wrong time.");
1942                 }
1943         }
1944
1945         /* Notify clients about changed exit status */
1946         unit_add_to_dbus_queue(u);
1947 }
1948
1949 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1950         Socket *s = SOCKET(u);
1951
1952         assert(s);
1953         assert(elapsed == 1);
1954         assert(w == &s->timer_watch);
1955
1956         switch (s->state) {
1957
1958         case SOCKET_START_PRE:
1959                 log_warning("%s starting timed out. Terminating.", u->id);
1960                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1961                 break;
1962
1963         case SOCKET_START_POST:
1964                 log_warning("%s starting timed out. Stopping.", u->id);
1965                 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
1966                 break;
1967
1968         case SOCKET_STOP_PRE:
1969                 log_warning("%s stopping timed out. Terminating.", u->id);
1970                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1971                 break;
1972
1973         case SOCKET_STOP_PRE_SIGTERM:
1974                 if (s->exec_context.send_sigkill) {
1975                         log_warning("%s stopping timed out. Killing.", u->id);
1976                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1977                 } else {
1978                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->id);
1979                         socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1980                 }
1981                 break;
1982
1983         case SOCKET_STOP_PRE_SIGKILL:
1984                 log_warning("%s still around after SIGKILL. Ignoring.", u->id);
1985                 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1986                 break;
1987
1988         case SOCKET_STOP_POST:
1989                 log_warning("%s stopping timed out (2). Terminating.", u->id);
1990                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1991                 break;
1992
1993         case SOCKET_FINAL_SIGTERM:
1994                 if (s->exec_context.send_sigkill) {
1995                         log_warning("%s stopping timed out (2). Killing.", u->id);
1996                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1997                 } else {
1998                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->id);
1999                         socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2000                 }
2001                 break;
2002
2003         case SOCKET_FINAL_SIGKILL:
2004                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->id);
2005                 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2006                 break;
2007
2008         default:
2009                 assert_not_reached("Timeout at wrong time.");
2010         }
2011 }
2012
2013 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
2014         int *rfds;
2015         unsigned rn_fds, k;
2016         SocketPort *p;
2017
2018         assert(s);
2019         assert(fds);
2020         assert(n_fds);
2021
2022         /* Called from the service code for requesting our fds */
2023
2024         rn_fds = 0;
2025         LIST_FOREACH(port, p, s->ports)
2026                 if (p->fd >= 0)
2027                         rn_fds++;
2028
2029         if (rn_fds <= 0) {
2030                 *fds = NULL;
2031                 *n_fds = 0;
2032                 return 0;
2033         }
2034
2035         if (!(rfds = new(int, rn_fds)))
2036                 return -ENOMEM;
2037
2038         k = 0;
2039         LIST_FOREACH(port, p, s->ports)
2040                 if (p->fd >= 0)
2041                         rfds[k++] = p->fd;
2042
2043         assert(k == rn_fds);
2044
2045         *fds = rfds;
2046         *n_fds = rn_fds;
2047
2048         return 0;
2049 }
2050
2051 void socket_notify_service_dead(Socket *s, bool failed_permanent) {
2052         assert(s);
2053
2054         /* The service is dead. Dang!
2055          *
2056          * This is strictly for one-instance-for-all-connections
2057          * services. */
2058
2059         if (s->state == SOCKET_RUNNING) {
2060                 log_debug("%s got notified about service death (failed permanently: %s)", UNIT(s)->id, yes_no(failed_permanent));
2061                 if (failed_permanent)
2062                         socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_FAILED_PERMANENT);
2063                 else
2064                         socket_enter_listening(s);
2065         }
2066 }
2067
2068 void socket_connection_unref(Socket *s) {
2069         assert(s);
2070
2071         /* The service is dead. Yay!
2072          *
2073          * This is strictly for one-instance-per-connection
2074          * services. */
2075
2076         assert(s->n_connections > 0);
2077         s->n_connections--;
2078
2079         log_debug("%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
2080 }
2081
2082 static void socket_reset_failed(Unit *u) {
2083         Socket *s = SOCKET(u);
2084
2085         assert(s);
2086
2087         if (s->state == SOCKET_FAILED)
2088                 socket_set_state(s, SOCKET_DEAD);
2089
2090         s->result = SOCKET_SUCCESS;
2091 }
2092
2093 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
2094         Socket *s = SOCKET(u);
2095         int r = 0;
2096         Set *pid_set = NULL;
2097
2098         assert(s);
2099
2100         if (who == KILL_MAIN) {
2101                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
2102                 return -ESRCH;
2103         }
2104
2105         if (s->control_pid <= 0 && who == KILL_CONTROL) {
2106                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
2107                 return -ESRCH;
2108         }
2109
2110         if (who == KILL_CONTROL || who == KILL_ALL)
2111                 if (s->control_pid > 0)
2112                         if (kill(s->control_pid, signo) < 0)
2113                                 r = -errno;
2114
2115         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
2116                 int q;
2117
2118                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
2119                         return -ENOMEM;
2120
2121                 /* Exclude the control pid from being killed via the cgroup */
2122                 if (s->control_pid > 0)
2123                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
2124                                 r = q;
2125                                 goto finish;
2126                         }
2127
2128                 if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
2129                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
2130                                 r = q;
2131         }
2132
2133 finish:
2134         if (pid_set)
2135                 set_free(pid_set);
2136
2137         return r;
2138 }
2139
2140 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2141         [SOCKET_DEAD] = "dead",
2142         [SOCKET_START_PRE] = "start-pre",
2143         [SOCKET_START_POST] = "start-post",
2144         [SOCKET_LISTENING] = "listening",
2145         [SOCKET_RUNNING] = "running",
2146         [SOCKET_STOP_PRE] = "stop-pre",
2147         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2148         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2149         [SOCKET_STOP_POST] = "stop-post",
2150         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2151         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2152         [SOCKET_FAILED] = "failed"
2153 };
2154
2155 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2156
2157 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2158         [SOCKET_EXEC_START_PRE] = "StartPre",
2159         [SOCKET_EXEC_START_POST] = "StartPost",
2160         [SOCKET_EXEC_STOP_PRE] = "StopPre",
2161         [SOCKET_EXEC_STOP_POST] = "StopPost"
2162 };
2163
2164 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2165
2166 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
2167         [SOCKET_SUCCESS] = "success",
2168         [SOCKET_FAILURE_RESOURCES] = "resources",
2169         [SOCKET_FAILURE_TIMEOUT] = "timeout",
2170         [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
2171         [SOCKET_FAILURE_SIGNAL] = "signal",
2172         [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
2173         [SOCKET_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent"
2174 };
2175
2176 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
2177
2178 const UnitVTable socket_vtable = {
2179         .suffix = ".socket",
2180         .object_size = sizeof(Socket),
2181         .sections =
2182                 "Unit\0"
2183                 "Socket\0"
2184                 "Install\0",
2185
2186         .init = socket_init,
2187         .done = socket_done,
2188         .load = socket_load,
2189
2190         .kill = socket_kill,
2191
2192         .coldplug = socket_coldplug,
2193
2194         .dump = socket_dump,
2195
2196         .start = socket_start,
2197         .stop = socket_stop,
2198
2199         .serialize = socket_serialize,
2200         .deserialize_item = socket_deserialize_item,
2201
2202         .active_state = socket_active_state,
2203         .sub_state_to_string = socket_sub_state_to_string,
2204
2205         .check_gc = socket_check_gc,
2206
2207         .fd_event = socket_fd_event,
2208         .sigchld_event = socket_sigchld_event,
2209         .timer_event = socket_timer_event,
2210
2211         .reset_failed = socket_reset_failed,
2212
2213         .bus_interface = "org.freedesktop.systemd1.Socket",
2214         .bus_message_handler = bus_socket_message_handler,
2215         .bus_invalidating_properties =  bus_socket_invalidating_properties
2216 };