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