src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29 #include <arpa/inet.h>
  30
  31 #include "unit.h"
  32 #include "socket.h"
  33 #include "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
  44 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  45         [SOCKET_DEAD] = UNIT_INACTIVE,
  46         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  47         [SOCKET_START_POST] = UNIT_ACTIVATING,
  48         [SOCKET_LISTENING] = UNIT_ACTIVE,
  49         [SOCKET_RUNNING] = UNIT_ACTIVE,
  50         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  51         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  52         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  53         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  54         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  55         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  56         [SOCKET_MAINTENANCE] = UNIT_MAINTENANCE
  57 };
  58
  59 static void socket_init(Unit *u) {
  60         Socket *s = SOCKET(u);
  61
  62         assert(u);
  63         assert(u->meta.load_state == UNIT_STUB);
  64
  65         s->backlog = SOMAXCONN;
  66         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  67         s->directory_mode = 0755;
  68         s->socket_mode = 0666;
  69
  70         s->max_connections = 64;
  71
  72         s->priority = -1;
  73         s->ip_tos = -1;
  74         s->ip_ttl = -1;
  75         s->mark = -1;
  76
  77         exec_context_init(&s->exec_context);
  78
  79         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  80 }
  81
  82 static void socket_unwatch_control_pid(Socket *s) {
  83         assert(s);
  84
  85         if (s->control_pid <= 0)
  86                 return;
  87
  88         unit_unwatch_pid(UNIT(s), s->control_pid);
  89         s->control_pid = 0;
  90 }
  91
  92 static void socket_done(Unit *u) {
  93         Socket *s = SOCKET(u);
  94         SocketPort *p;
  95         Meta *i;
  96
  97         assert(s);
  98
  99         while ((p = s->ports)) {
 100                 LIST_REMOVE(SocketPort, port, s->ports, p);
 101
 102                 if (p->fd >= 0) {
 103                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 104                         close_nointr_nofail(p->fd);
 105                 }
 106
 107                 free(p->path);
 108                 free(p);
 109         }
 110
 111         exec_context_done(&s->exec_context);
 112         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 113         s->control_command = NULL;
 114
 115         socket_unwatch_control_pid(s);
 116
 117         s->service = NULL;
 118
 119         free(s->tcp_congestion);
 120         s->tcp_congestion = NULL;
 121
 122         free(s->bind_to_device);
 123         s->bind_to_device = NULL;
 124
 125         unit_unwatch_timer(u, &s->timer_watch);
 126
 127         /* Make sure no service instance refers to us anymore. */
 128         LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
 129                 Service *service = (Service *) i;
 130
 131                 if (service->socket == s)
 132                         service->socket = NULL;
 133         }
 134 }
 135
 136 static int socket_instantiate_service(Socket *s) {
 137         char *prefix, *name;
 138         int r;
 139         Unit *u;
 140
 141         assert(s);
 142
 143         /* This fills in s->service if it isn't filled in yet. For
 144          * Accept=yes sockets we create the next connection service
 145          * here. For Accept=no this is mostly a NOP since the service
 146          * is figured out at load time anyway. */
 147
 148         if (s->service)
 149                 return 0;
 150
 151         assert(s->accept);
 152
 153         if (!(prefix = unit_name_to_prefix(s->meta.id)))
 154                 return -ENOMEM;
 155
 156         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 157         free(prefix);
 158
 159         if (r < 0)
 160                 return -ENOMEM;
 161
 162         r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
 163         free(name);
 164
 165         if (r < 0)
 166                 return r;
 167
 168         u->meta.no_gc = true;
 169         s->service = SERVICE(u);
 170         return 0;
 171 }
 172
 173 static bool have_non_accept_socket(Socket *s) {
 174         SocketPort *p;
 175
 176         assert(s);
 177
 178         if (!s->accept)
 179                 return true;
 180
 181         LIST_FOREACH(port, p, s->ports) {
 182
 183                 if (p->type != SOCKET_SOCKET)
 184                         return true;
 185
 186                 if (!socket_address_can_accept(&p->address))
 187                         return true;
 188         }
 189
 190         return false;
 191 }
 192
 193 static int socket_verify(Socket *s) {
 194         assert(s);
 195
 196         if (s->meta.load_state != UNIT_LOADED)
 197                 return 0;
 198
 199         if (!s->ports) {
 200                 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
 201                 return -EINVAL;
 202         }
 203
 204         if (s->accept && have_non_accept_socket(s)) {
 205                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
 206                 return -EINVAL;
 207         }
 208
 209         if (s->accept && s->max_connections <= 0) {
 210                 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
 211                 return -EINVAL;
 212         }
 213
 214         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 215                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
 216                 return -EINVAL;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static bool socket_needs_mount(Socket *s, const char *prefix) {
 223         SocketPort *p;
 224
 225         assert(s);
 226
 227         LIST_FOREACH(port, p, s->ports) {
 228
 229                 if (p->type == SOCKET_SOCKET) {
 230                         if (socket_address_needs_mount(&p->address, prefix))
 231                                 return true;
 232                 } else {
 233                         assert(p->type == SOCKET_FIFO);
 234                         if (path_startswith(p->path, prefix))
 235                                 return true;
 236                 }
 237         }
 238
 239         return false;
 240 }
 241
 242 int socket_add_one_mount_link(Socket *s, Mount *m) {
 243         int r;
 244
 245         assert(s);
 246         assert(m);
 247
 248         if (s->meta.load_state != UNIT_LOADED ||
 249             m->meta.load_state != UNIT_LOADED)
 250                 return 0;
 251
 252         if (!socket_needs_mount(s, m->where))
 253                 return 0;
 254
 255         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 256                 return r;
 257
 258         return 0;
 259 }
 260
 261 static int socket_add_mount_links(Socket *s) {
 262         Meta *other;
 263         int r;
 264
 265         assert(s);
 266
 267         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 268                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 269                         return r;
 270
 271         return 0;
 272 }
 273
 274 static int socket_add_device_link(Socket *s) {
 275         char *t;
 276         int r;
 277
 278         assert(s);
 279
 280         if (!s->bind_to_device)
 281                 return 0;
 282
 283         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 284                 return -ENOMEM;
 285
 286         r = unit_add_node_link(UNIT(s), t, false);
 287         free(t);
 288
 289         return r;
 290 }
 291
 292 static int socket_add_default_dependencies(Socket *s) {
 293         int r;
 294         assert(s);
 295
 296         if (s->meta.manager->running_as == MANAGER_SYSTEM)
 297                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 298                         return r;
 299
 300         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 301 }
 302
 303 static int socket_load(Unit *u) {
 304         Socket *s = SOCKET(u);
 305         int r;
 306
 307         assert(u);
 308         assert(u->meta.load_state == UNIT_STUB);
 309
 310         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 311                 return r;
 312
 313         /* This is a new unit? Then let's add in some extras */
 314         if (u->meta.load_state == UNIT_LOADED) {
 315
 316                 if (have_non_accept_socket(s)) {
 317                         if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
 318                                 return r;
 319
 320                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 321                                 return r;
 322                 }
 323
 324                 if ((r = socket_add_mount_links(s)) < 0)
 325                         return r;
 326
 327                 if ((r = socket_add_device_link(s)) < 0)
 328                         return r;
 329
 330                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 331                         return r;
 332
 333                 if ((r = unit_add_default_cgroup(u)) < 0)
 334                         return r;
 335
 336                 if (s->meta.default_dependencies)
 337                         if ((r = socket_add_default_dependencies(s)) < 0)
 338                                 return r;
 339         }
 340
 341         return socket_verify(s);
 342 }
 343
 344 static const char* listen_lookup(int type) {
 345
 346         if (type == SOCK_STREAM)
 347                 return "ListenStream";
 348         else if (type == SOCK_DGRAM)
 349                 return "ListenDatagram";
 350         else if (type == SOCK_SEQPACKET)
 351                 return "ListenSequentialPacket";
 352
 353         assert_not_reached("Unknown socket type");
 354         return NULL;
 355 }
 356
 357 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 358
 359         SocketExecCommand c;
 360         Socket *s = SOCKET(u);
 361         SocketPort *p;
 362         const char *prefix2;
 363         char *p2;
 364
 365         assert(s);
 366         assert(f);
 367
 368         p2 = strappend(prefix, "\t");
 369         prefix2 = p2 ? p2 : prefix;
 370
 371         fprintf(f,
 372                 "%sSocket State: %s\n"
 373                 "%sBindIPv6Only: %s\n"
 374                 "%sBacklog: %u\n"
 375                 "%sSocketMode: %04o\n"
 376                 "%sDirectoryMode: %04o\n"
 377                 "%sKeepAlive: %s\n"
 378                 "%sFreeBind: %s\n"
 379                 "%sTCPCongestion: %s\n",
 380                 prefix, socket_state_to_string(s->state),
 381                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 382                 prefix, s->backlog,
 383                 prefix, s->socket_mode,
 384                 prefix, s->directory_mode,
 385                 prefix, yes_no(s->keep_alive),
 386                 prefix, yes_no(s->free_bind),
 387                 prefix, s->tcp_congestion);
 388
 389         if (s->control_pid > 0)
 390                 fprintf(f,
 391                         "%sControl PID: %lu\n",
 392                         prefix, (unsigned long) s->control_pid);
 393
 394         if (s->bind_to_device)
 395                 fprintf(f,
 396                         "%sBindToDevice: %s\n",
 397                         prefix, s->bind_to_device);
 398
 399         if (s->accept)
 400                 fprintf(f,
 401                         "%sAccepted: %u\n"
 402                         "%sNConnections: %u\n"
 403                         "%sMaxConnections: %u\n",
 404                         prefix, s->n_accepted,
 405                         prefix, s->n_connections,
 406                         prefix, s->max_connections);
 407
 408         if (s->priority >= 0)
 409                 fprintf(f,
 410                         "%sPriority: %i\n",
 411                         prefix, s->priority);
 412
 413         if (s->receive_buffer > 0)
 414                 fprintf(f,
 415                         "%sReceiveBuffer: %zu\n",
 416                         prefix, s->receive_buffer);
 417
 418         if (s->send_buffer > 0)
 419                 fprintf(f,
 420                         "%sSendBuffer: %zu\n",
 421                         prefix, s->send_buffer);
 422
 423         if (s->ip_tos >= 0)
 424                 fprintf(f,
 425                         "%sIPTOS: %i\n",
 426                         prefix, s->ip_tos);
 427
 428         if (s->ip_ttl >= 0)
 429                 fprintf(f,
 430                         "%sIPTTL: %i\n",
 431                         prefix, s->ip_ttl);
 432
 433         if (s->pipe_size > 0)
 434                 fprintf(f,
 435                         "%sPipeSize: %zu\n",
 436                         prefix, s->pipe_size);
 437
 438         if (s->mark >= 0)
 439                 fprintf(f,
 440                         "%sMark: %i\n",
 441                         prefix, s->mark);
 442
 443         LIST_FOREACH(port, p, s->ports) {
 444
 445                 if (p->type == SOCKET_SOCKET) {
 446                         const char *t;
 447                         int r;
 448                         char *k;
 449
 450                         if ((r = socket_address_print(&p->address, &k)) < 0)
 451                                 t = strerror(-r);
 452                         else
 453                                 t = k;
 454
 455                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 456                         free(k);
 457                 } else
 458                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 459         }
 460
 461         exec_context_dump(&s->exec_context, f, prefix);
 462
 463         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 464                 if (!s->exec_command[c])
 465                         continue;
 466
 467                 fprintf(f, "%s-> %s:\n",
 468                         prefix, socket_exec_command_to_string(c));
 469
 470                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 471         }
 472
 473         free(p2);
 474 }
 475
 476 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 477         socklen_t l;
 478         char *r;
 479         union {
 480                 struct sockaddr sa;
 481                 struct sockaddr_un un;
 482                 struct sockaddr_in in;
 483                 struct sockaddr_in6 in6;
 484                 struct sockaddr_storage storage;
 485         } local, remote;
 486
 487         assert(fd >= 0);
 488         assert(instance);
 489
 490         l = sizeof(local);
 491         if (getsockname(fd, &local.sa, &l) < 0)
 492                 return -errno;
 493
 494         l = sizeof(remote);
 495         if (getpeername(fd, &remote.sa, &l) < 0)
 496                 return -errno;
 497
 498         switch (local.sa.sa_family) {
 499
 500         case AF_INET: {
 501                 uint32_t
 502                         a = ntohl(local.in.sin_addr.s_addr),
 503                         b = ntohl(remote.in.sin_addr.s_addr);
 504
 505                 if (asprintf(&r,
 506                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 507                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 508                              ntohs(local.in.sin_port),
 509                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 510                              ntohs(remote.in.sin_port)) < 0)
 511                         return -ENOMEM;
 512
 513                 break;
 514         }
 515
 516         case AF_INET6: {
 517                 static const char ipv4_prefix[] = {
 518                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 519                 };
 520
 521                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 522                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 523                         const uint8_t
 524                                 *a = local.in6.sin6_addr.s6_addr+12,
 525                                 *b = remote.in6.sin6_addr.s6_addr+12;
 526
 527                         if (asprintf(&r,
 528                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 529                                      a[0], a[1], a[2], a[3],
 530                                      ntohs(local.in6.sin6_port),
 531                                      b[0], b[1], b[2], b[3],
 532                                      ntohs(remote.in6.sin6_port)) < 0)
 533                                 return -ENOMEM;
 534                 } else {
 535                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 536
 537                         if (asprintf(&r,
 538                                      "%s:%u-%s:%u",
 539                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 540                                      ntohs(local.in6.sin6_port),
 541                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 542                                      ntohs(remote.in6.sin6_port)) < 0)
 543                                 return -ENOMEM;
 544                 }
 545
 546                 break;
 547         }
 548
 549         case AF_UNIX: {
 550                 struct ucred ucred;
 551
 552                 l = sizeof(ucred);
 553                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 554                         return -errno;
 555
 556                 if (asprintf(&r,
 557                              "%u-%lu-%lu",
 558                              nr,
 559                              (unsigned long) ucred.pid,
 560                              (unsigned long) ucred.uid) < 0)
 561                         return -ENOMEM;
 562
 563                 break;
 564         }
 565
 566         default:
 567                 assert_not_reached("Unhandled socket type.");
 568         }
 569
 570         *instance = r;
 571         return 0;
 572 }
 573
 574 static void socket_close_fds(Socket *s) {
 575         SocketPort *p;
 576
 577         assert(s);
 578
 579         LIST_FOREACH(port, p, s->ports) {
 580                 if (p->fd < 0)
 581                         continue;
 582
 583                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 584                 close_nointr_nofail(p->fd);
 585
 586                 /* One little note: we should never delete any sockets
 587                  * in the file system here! After all some other
 588                  * process we spawned might still have a reference of
 589                  * this fd and wants to continue to use it. Therefore
 590                  * we delete sockets in the file system before we
 591                  * create a new one, not after we stopped using
 592                  * one! */
 593
 594                 p->fd = -1;
 595         }
 596 }
 597
 598 static void socket_apply_socket_options(Socket *s, int fd) {
 599         assert(s);
 600         assert(fd >= 0);
 601
 602         if (s->keep_alive) {
 603                 int b = s->keep_alive;
 604                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 605                         log_warning("SO_KEEPALIVE failed: %m");
 606         }
 607
 608         if (s->priority >= 0)
 609                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 610                         log_warning("SO_PRIORITY failed: %m");
 611
 612         if (s->receive_buffer > 0) {
 613                 int value = (int) s->receive_buffer;
 614                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 615                         log_warning("SO_RCVBUF failed: %m");
 616         }
 617
 618         if (s->send_buffer > 0) {
 619                 int value = (int) s->send_buffer;
 620                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 621                         log_warning("SO_SNDBUF failed: %m");
 622         }
 623
 624         if (s->mark >= 0)
 625                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 626                         log_warning("SO_MARK failed: %m");
 627
 628         if (s->ip_tos >= 0)
 629                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 630                         log_warning("IP_TOS failed: %m");
 631
 632         if (s->ip_ttl >= 0) {
 633                 int r, x;
 634
 635                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 636                 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 637
 638                 if (r < 0 && x < 0)
 639                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 640         }
 641
 642         if (s->tcp_congestion)
 643                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 644                         log_warning("TCP_CONGESTION failed: %m");
 645 }
 646
 647 static void socket_apply_fifo_options(Socket *s, int fd) {
 648         assert(s);
 649         assert(fd >= 0);
 650
 651         if (s->pipe_size > 0)
 652                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 653                         log_warning("F_SETPIPE_SZ: %m");
 654 }
 655
 656
 657 static int fifo_address_create(
 658                 const char *path,
 659                 mode_t directory_mode,
 660                 mode_t socket_mode,
 661                 const char *label,
 662                 int *_fd) {
 663
 664         int fd = -1, r = 0;
 665         struct stat st;
 666         mode_t old_mask;
 667
 668         assert(path);
 669         assert(_fd);
 670
 671         mkdir_parents(path, directory_mode);
 672
 673         if ((r = label_fifofile_set(label, path)) < 0)
 674                 goto fail;
 675
 676         /* Enforce the right access mode for the fifo */
 677         old_mask = umask(~ socket_mode);
 678
 679         /* Include the original umask in our mask */
 680         umask(~socket_mode | old_mask);
 681
 682         r = mkfifo(path, socket_mode);
 683         umask(old_mask);
 684
 685         if (r < 0) {
 686                 r = -errno;
 687                 goto fail;
 688         }
 689
 690         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 691                 r = -errno;
 692                 goto fail;
 693         }
 694
 695         label_file_clear();
 696
 697         if (fstat(fd, &st) < 0) {
 698                 r = -errno;
 699                 goto fail;
 700         }
 701
 702         if (!S_ISFIFO(st.st_mode) ||
 703             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 704             st.st_uid != getuid() ||
 705             st.st_gid != getgid()) {
 706
 707                 r = -EEXIST;
 708                 goto fail;
 709         }
 710
 711         *_fd = fd;
 712         return 0;
 713
 714 fail:
 715         label_file_clear();
 716
 717         if (fd >= 0)
 718                 close_nointr_nofail(fd);
 719
 720         return r;
 721 }
 722
 723 static int socket_open_fds(Socket *s) {
 724         SocketPort *p;
 725         int r;
 726         char *label = NULL;
 727
 728         assert(s);
 729
 730         if ((r = socket_instantiate_service(s)) < 0)
 731                 return r;
 732
 733         if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
 734                 return r;
 735
 736         LIST_FOREACH(port, p, s->ports) {
 737
 738                 if (p->fd >= 0)
 739                         continue;
 740
 741                 if (p->type == SOCKET_SOCKET) {
 742
 743                         if ((r = socket_address_listen(
 744                                              &p->address,
 745                                              s->backlog,
 746                                              s->bind_ipv6_only,
 747                                              s->bind_to_device,
 748                                              s->free_bind,
 749                                              s->directory_mode,
 750                                              s->socket_mode,
 751                                              label,
 752                                              &p->fd)) < 0)
 753                                 goto rollback;
 754
 755                         socket_apply_socket_options(s, p->fd);
 756
 757                 } else  if (p->type == SOCKET_FIFO) {
 758
 759                         if ((r = fifo_address_create(
 760                                              p->path,
 761                                              s->directory_mode,
 762                                              s->socket_mode,
 763                                              label,
 764                                              &p->fd)) < 0)
 765                                 goto rollback;
 766
 767                         socket_apply_fifo_options(s, p->fd);
 768
 769                 } else
 770                         assert_not_reached("Unknown port type");
 771         }
 772
 773         label_free(label);
 774         return 0;
 775
 776 rollback:
 777         socket_close_fds(s);
 778         label_free(label);
 779         return r;
 780 }
 781
 782 static void socket_unwatch_fds(Socket *s) {
 783         SocketPort *p;
 784
 785         assert(s);
 786
 787         LIST_FOREACH(port, p, s->ports) {
 788                 if (p->fd < 0)
 789                         continue;
 790
 791                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 792         }
 793 }
 794
 795 static int socket_watch_fds(Socket *s) {
 796         SocketPort *p;
 797         int r;
 798
 799         assert(s);
 800
 801         LIST_FOREACH(port, p, s->ports) {
 802                 if (p->fd < 0)
 803                         continue;
 804
 805                 p->fd_watch.socket_accept =
 806                         s->accept &&
 807                         p->type == SOCKET_SOCKET &&
 808                         socket_address_can_accept(&p->address);
 809
 810                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 811                         goto fail;
 812         }
 813
 814         return 0;
 815
 816 fail:
 817         socket_unwatch_fds(s);
 818         return r;
 819 }
 820
 821 static void socket_set_state(Socket *s, SocketState state) {
 822         SocketState old_state;
 823         assert(s);
 824
 825         old_state = s->state;
 826         s->state = state;
 827
 828         if (state != SOCKET_START_PRE &&
 829             state != SOCKET_START_POST &&
 830             state != SOCKET_STOP_PRE &&
 831             state != SOCKET_STOP_PRE_SIGTERM &&
 832             state != SOCKET_STOP_PRE_SIGKILL &&
 833             state != SOCKET_STOP_POST &&
 834             state != SOCKET_FINAL_SIGTERM &&
 835             state != SOCKET_FINAL_SIGKILL) {
 836                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 837                 socket_unwatch_control_pid(s);
 838                 s->control_command = NULL;
 839                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 840         }
 841
 842         if (state != SOCKET_LISTENING)
 843                 socket_unwatch_fds(s);
 844
 845         if (state != SOCKET_START_POST &&
 846             state != SOCKET_LISTENING &&
 847             state != SOCKET_RUNNING &&
 848             state != SOCKET_STOP_PRE &&
 849             state != SOCKET_STOP_PRE_SIGTERM &&
 850             state != SOCKET_STOP_PRE_SIGKILL)
 851                 socket_close_fds(s);
 852
 853         if (state != old_state)
 854                 log_debug("%s changed %s -> %s",
 855                           s->meta.id,
 856                           socket_state_to_string(old_state),
 857                           socket_state_to_string(state));
 858
 859         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 860 }
 861
 862 static int socket_coldplug(Unit *u) {
 863         Socket *s = SOCKET(u);
 864         int r;
 865
 866         assert(s);
 867         assert(s->state == SOCKET_DEAD);
 868
 869         if (s->deserialized_state != s->state) {
 870
 871                 if (s->deserialized_state == SOCKET_START_PRE ||
 872                     s->deserialized_state == SOCKET_START_POST ||
 873                     s->deserialized_state == SOCKET_STOP_PRE ||
 874                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 875                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 876                     s->deserialized_state == SOCKET_STOP_POST ||
 877                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 878                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 879
 880                         if (s->control_pid <= 0)
 881                                 return -EBADMSG;
 882
 883                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 884                                 return r;
 885
 886                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 887                                 return r;
 888                 }
 889
 890                 if (s->deserialized_state == SOCKET_START_POST ||
 891                     s->deserialized_state == SOCKET_LISTENING ||
 892                     s->deserialized_state == SOCKET_RUNNING ||
 893                     s->deserialized_state == SOCKET_STOP_PRE ||
 894                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 895                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 896                         if ((r = socket_open_fds(s)) < 0)
 897                                 return r;
 898
 899                 if (s->deserialized_state == SOCKET_LISTENING)
 900                         if ((r = socket_watch_fds(s)) < 0)
 901                                 return r;
 902
 903                 socket_set_state(s, s->deserialized_state);
 904         }
 905
 906         return 0;
 907 }
 908
 909 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 910         pid_t pid;
 911         int r;
 912         char **argv;
 913
 914         assert(s);
 915         assert(c);
 916         assert(_pid);
 917
 918         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 919                 goto fail;
 920
 921         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 922                 r = -ENOMEM;
 923                 goto fail;
 924         }
 925
 926         r = exec_spawn(c,
 927                        argv,
 928                        &s->exec_context,
 929                        NULL, 0,
 930                        s->meta.manager->environment,
 931                        true,
 932                        true,
 933                        true,
 934                        s->meta.manager->confirm_spawn,
 935                        s->meta.cgroup_bondings,
 936                        &pid);
 937
 938         strv_free(argv);
 939         if (r < 0)
 940                 goto fail;
 941
 942         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 943                 /* FIXME: we need to do something here */
 944                 goto fail;
 945
 946         *_pid = pid;
 947
 948         return 0;
 949
 950 fail:
 951         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 952
 953         return r;
 954 }
 955
 956 static void socket_enter_dead(Socket *s, bool success) {
 957         assert(s);
 958
 959         if (!success)
 960                 s->failure = true;
 961
 962         socket_set_state(s, s->failure ? SOCKET_MAINTENANCE : SOCKET_DEAD);
 963 }
 964
 965 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 966
 967 static void socket_enter_stop_post(Socket *s, bool success) {
 968         int r;
 969         assert(s);
 970
 971         if (!success)
 972                 s->failure = true;
 973
 974         socket_unwatch_control_pid(s);
 975
 976         s->control_command_id = SOCKET_EXEC_STOP_POST;
 977
 978         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 979                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 980                         goto fail;
 981
 982                 socket_set_state(s, SOCKET_STOP_POST);
 983         } else
 984                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
 985
 986         return;
 987
 988 fail:
 989         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
 990         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 991 }
 992
 993 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 994         int r;
 995         bool sent = false;
 996
 997         assert(s);
 998
 999         if (!success)
1000                 s->failure = true;
1001
1002         if (s->exec_context.kill_mode != KILL_NONE) {
1003                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1004
1005                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1006
1007                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
1008                                 if (r != -EAGAIN && r != -ESRCH)
1009                                         goto fail;
1010                         } else
1011                                 sent = true;
1012                 }
1013
1014                 if (!sent && s->control_pid > 0)
1015                         if (kill(s->exec_context.kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
1016                                 r = -errno;
1017                                 goto fail;
1018                         }
1019         }
1020
1021         if (sent && s->control_pid > 0) {
1022                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1023                         goto fail;
1024
1025                 socket_set_state(s, state);
1026         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1027                 socket_enter_stop_post(s, true);
1028         else
1029                 socket_enter_dead(s, true);
1030
1031         return;
1032
1033 fail:
1034         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1035
1036         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1037                 socket_enter_stop_post(s, false);
1038         else
1039                 socket_enter_dead(s, false);
1040 }
1041
1042 static void socket_enter_stop_pre(Socket *s, bool success) {
1043         int r;
1044         assert(s);
1045
1046         if (!success)
1047                 s->failure = true;
1048
1049         socket_unwatch_control_pid(s);
1050
1051         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1052
1053         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1054                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1055                         goto fail;
1056
1057                 socket_set_state(s, SOCKET_STOP_PRE);
1058         } else
1059                 socket_enter_stop_post(s, true);
1060
1061         return;
1062
1063 fail:
1064         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1065         socket_enter_stop_post(s, false);
1066 }
1067
1068 static void socket_enter_listening(Socket *s) {
1069         int r;
1070         assert(s);
1071
1072         if ((r = socket_watch_fds(s)) < 0) {
1073                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1074                 goto fail;
1075         }
1076
1077         socket_set_state(s, SOCKET_LISTENING);
1078         return;
1079
1080 fail:
1081         socket_enter_stop_pre(s, false);
1082 }
1083
1084 static void socket_enter_start_post(Socket *s) {
1085         int r;
1086         assert(s);
1087
1088         if ((r = socket_open_fds(s)) < 0) {
1089                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1090                 goto fail;
1091         }
1092
1093         socket_unwatch_control_pid(s);
1094
1095         s->control_command_id = SOCKET_EXEC_START_POST;
1096
1097         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1098                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1099                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1100                         goto fail;
1101                 }
1102
1103                 socket_set_state(s, SOCKET_START_POST);
1104         } else
1105                 socket_enter_listening(s);
1106
1107         return;
1108
1109 fail:
1110         socket_enter_stop_pre(s, false);
1111 }
1112
1113 static void socket_enter_start_pre(Socket *s) {
1114         int r;
1115         assert(s);
1116
1117         socket_unwatch_control_pid(s);
1118
1119         s->control_command_id = SOCKET_EXEC_START_PRE;
1120
1121         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1122                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1123                         goto fail;
1124
1125                 socket_set_state(s, SOCKET_START_PRE);
1126         } else
1127                 socket_enter_start_post(s);
1128
1129         return;
1130
1131 fail:
1132         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1133         socket_enter_dead(s, false);
1134 }
1135
1136 static void socket_enter_running(Socket *s, int cfd) {
1137         int r;
1138         DBusError error;
1139
1140         assert(s);
1141         dbus_error_init(&error);
1142
1143         /* We don't take connections anymore if we are supposed to
1144          * shut down anyway */
1145         if (s->meta.job && s->meta.job->type == JOB_STOP) {
1146                 if (cfd >= 0)
1147                         close_nointr_nofail(cfd);
1148                 else  {
1149                         /* Flush all sockets by closing and reopening them */
1150                         socket_close_fds(s);
1151
1152                         if ((r = socket_watch_fds(s)) < 0) {
1153                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1154                                 socket_enter_stop_pre(s, false);
1155                         }
1156                 }
1157
1158                 return;
1159         }
1160
1161         if (cfd < 0) {
1162                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1163                         goto fail;
1164
1165                 socket_set_state(s, SOCKET_RUNNING);
1166         } else {
1167                 char *prefix, *instance = NULL, *name;
1168                 Service *service;
1169
1170                 if (s->n_connections >= s->max_connections) {
1171                         log_warning("Too many incoming connections (%u)", s->n_connections);
1172                         close_nointr_nofail(cfd);
1173                         return;
1174                 }
1175
1176                 if ((r = socket_instantiate_service(s)) < 0)
1177                         goto fail;
1178
1179                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1180                         goto fail;
1181
1182                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1183                         free(instance);
1184                         r = -ENOMEM;
1185                         goto fail;
1186                 }
1187
1188                 name = unit_name_build(prefix, instance, ".service");
1189                 free(prefix);
1190                 free(instance);
1191
1192                 if (!name) {
1193                         r = -ENOMEM;
1194                         goto fail;
1195                 }
1196
1197                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1198                         free(name);
1199                         goto fail;
1200                 }
1201
1202                 service = s->service;
1203                 s->service = NULL;
1204                 s->n_accepted ++;
1205
1206                 service->meta.no_gc = false;
1207
1208                 unit_choose_id(UNIT(service), name);
1209                 free(name);
1210
1211                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1212                         goto fail;
1213
1214                 cfd = -1;
1215                 s->n_connections ++;
1216
1217                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1218                         goto fail;
1219         }
1220
1221         return;
1222
1223 fail:
1224         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1225         socket_enter_stop_pre(s, false);
1226
1227         if (cfd >= 0)
1228                 close_nointr_nofail(cfd);
1229
1230         dbus_error_free(&error);
1231 }
1232
1233 static void socket_run_next(Socket *s, bool success) {
1234         int r;
1235
1236         assert(s);
1237         assert(s->control_command);
1238         assert(s->control_command->command_next);
1239
1240         if (!success)
1241                 s->failure = true;
1242
1243         socket_unwatch_control_pid(s);
1244
1245         s->control_command = s->control_command->command_next;
1246
1247         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1248                 goto fail;
1249
1250         return;
1251
1252 fail:
1253         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1254
1255         if (s->state == SOCKET_START_POST)
1256                 socket_enter_stop_pre(s, false);
1257         else if (s->state == SOCKET_STOP_POST)
1258                 socket_enter_dead(s, false);
1259         else
1260                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1261 }
1262
1263 static int socket_start(Unit *u) {
1264         Socket *s = SOCKET(u);
1265
1266         assert(s);
1267
1268         /* We cannot fulfill this request right now, try again later
1269          * please! */
1270         if (s->state == SOCKET_STOP_PRE ||
1271             s->state == SOCKET_STOP_PRE_SIGKILL ||
1272             s->state == SOCKET_STOP_PRE_SIGTERM ||
1273             s->state == SOCKET_STOP_POST ||
1274             s->state == SOCKET_FINAL_SIGTERM ||
1275             s->state == SOCKET_FINAL_SIGKILL)
1276                 return -EAGAIN;
1277
1278         if (s->state == SOCKET_START_PRE ||
1279             s->state == SOCKET_START_POST)
1280                 return 0;
1281
1282         /* Cannot run this without the service being around */
1283         if (s->service) {
1284                 if (s->service->meta.load_state != UNIT_LOADED)
1285                         return -ENOENT;
1286
1287                 /* If the service is alredy actvie we cannot start the
1288                  * socket */
1289                 if (s->service->state != SERVICE_DEAD &&
1290                     s->service->state != SERVICE_MAINTENANCE &&
1291                     s->service->state != SERVICE_AUTO_RESTART)
1292                         return -EBUSY;
1293         }
1294
1295         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTENANCE);
1296
1297         s->failure = false;
1298         socket_enter_start_pre(s);
1299         return 0;
1300 }
1301
1302 static int socket_stop(Unit *u) {
1303         Socket *s = SOCKET(u);
1304
1305         assert(s);
1306
1307         /* Already on it */
1308         if (s->state == SOCKET_STOP_PRE ||
1309             s->state == SOCKET_STOP_PRE_SIGTERM ||
1310             s->state == SOCKET_STOP_PRE_SIGKILL ||
1311             s->state == SOCKET_STOP_POST ||
1312             s->state == SOCKET_FINAL_SIGTERM ||
1313             s->state == SOCKET_FINAL_SIGKILL)
1314                 return 0;
1315
1316         /* If there's already something running we go directly into
1317          * kill mode. */
1318         if (s->state == SOCKET_START_PRE ||
1319             s->state == SOCKET_START_POST) {
1320                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1321                 return -EAGAIN;
1322         }
1323
1324         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1325
1326         socket_enter_stop_pre(s, true);
1327         return 0;
1328 }
1329
1330 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1331         Socket *s = SOCKET(u);
1332         SocketPort *p;
1333         int r;
1334
1335         assert(u);
1336         assert(f);
1337         assert(fds);
1338
1339         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1340         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1341         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1342
1343         if (s->control_pid > 0)
1344                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1345
1346         if (s->control_command_id >= 0)
1347                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1348
1349         LIST_FOREACH(port, p, s->ports) {
1350                 int copy;
1351
1352                 if (p->fd < 0)
1353                         continue;
1354
1355                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1356                         return copy;
1357
1358                 if (p->type == SOCKET_SOCKET) {
1359                         char *t;
1360
1361                         if ((r = socket_address_print(&p->address, &t)) < 0)
1362                                 return r;
1363
1364                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1365                         free(t);
1366                 } else {
1367                         assert(p->type == SOCKET_FIFO);
1368                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1369                 }
1370         }
1371
1372         return 0;
1373 }
1374
1375 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1376         Socket *s = SOCKET(u);
1377         int r;
1378
1379         assert(u);
1380         assert(key);
1381         assert(value);
1382         assert(fds);
1383
1384         if (streq(key, "state")) {
1385                 SocketState state;
1386
1387                 if ((state = socket_state_from_string(value)) < 0)
1388                         log_debug("Failed to parse state value %s", value);
1389                 else
1390                         s->deserialized_state = state;
1391         } else if (streq(key, "failure")) {
1392                 int b;
1393
1394                 if ((b = parse_boolean(value)) < 0)
1395                         log_debug("Failed to parse failure value %s", value);
1396                 else
1397                         s->failure = b || s->failure;
1398
1399         } else if (streq(key, "n-accepted")) {
1400                 unsigned k;
1401
1402                 if ((r = safe_atou(value, &k)) < 0)
1403                         log_debug("Failed to parse n-accepted value %s", value);
1404                 else
1405                         s->n_accepted += k;
1406         } else if (streq(key, "control-pid")) {
1407                 pid_t pid;
1408
1409                 if ((r = parse_pid(value, &pid)) < 0)
1410                         log_debug("Failed to parse control-pid value %s", value);
1411                 else
1412                         s->control_pid = pid;
1413         } else if (streq(key, "control-command")) {
1414                 SocketExecCommand id;
1415
1416                 if ((id = socket_exec_command_from_string(value)) < 0)
1417                         log_debug("Failed to parse exec-command value %s", value);
1418                 else {
1419                         s->control_command_id = id;
1420                         s->control_command = s->exec_command[id];
1421                 }
1422         } else if (streq(key, "fifo")) {
1423                 int fd, skip = 0;
1424                 SocketPort *p;
1425
1426                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1427                         log_debug("Failed to parse fifo value %s", value);
1428                 else {
1429
1430                         LIST_FOREACH(port, p, s->ports)
1431                                 if (streq(p->path, value+skip))
1432                                         break;
1433
1434                         if (p) {
1435                                 if (p->fd >= 0)
1436                                         close_nointr_nofail(p->fd);
1437                                 p->fd = fdset_remove(fds, fd);
1438                         }
1439                 }
1440
1441         } else if (streq(key, "socket")) {
1442                 int fd, type, skip = 0;
1443                 SocketPort *p;
1444
1445                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1446                         log_debug("Failed to parse socket value %s", value);
1447                 else {
1448
1449                         LIST_FOREACH(port, p, s->ports)
1450                                 if (socket_address_is(&p->address, value+skip, type))
1451                                         break;
1452
1453                         if (p) {
1454                                 if (p->fd >= 0)
1455                                         close_nointr_nofail(p->fd);
1456                                 p->fd = fdset_remove(fds, fd);
1457                         }
1458                 }
1459
1460         } else
1461                 log_debug("Unknown serialization key '%s'", key);
1462
1463         return 0;
1464 }
1465
1466 static UnitActiveState socket_active_state(Unit *u) {
1467         assert(u);
1468
1469         return state_translation_table[SOCKET(u)->state];
1470 }
1471
1472 static const char *socket_sub_state_to_string(Unit *u) {
1473         assert(u);
1474
1475         return socket_state_to_string(SOCKET(u)->state);
1476 }
1477
1478 static bool socket_check_gc(Unit *u) {
1479         Socket *s = SOCKET(u);
1480
1481         assert(u);
1482
1483         return s->n_connections > 0;
1484 }
1485
1486 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1487         Socket *s = SOCKET(u);
1488         int cfd = -1;
1489
1490         assert(s);
1491         assert(fd >= 0);
1492
1493         if (s->state != SOCKET_LISTENING)
1494                 return;
1495
1496         log_debug("Incoming traffic on %s", u->meta.id);
1497
1498         if (events != EPOLLIN) {
1499                 log_error("Got invalid poll event on socket.");
1500                 goto fail;
1501         }
1502
1503         if (w->socket_accept) {
1504                 for (;;) {
1505
1506                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1507
1508                                 if (errno == EINTR)
1509                                         continue;
1510
1511                                 log_error("Failed to accept socket: %m");
1512                                 goto fail;
1513                         }
1514
1515                         break;
1516                 }
1517
1518                 socket_apply_socket_options(s, cfd);
1519         }
1520
1521         socket_enter_running(s, cfd);
1522         return;
1523
1524 fail:
1525         socket_enter_stop_pre(s, false);
1526 }
1527
1528 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1529         Socket *s = SOCKET(u);
1530         bool success;
1531
1532         assert(s);
1533         assert(pid >= 0);
1534
1535         if (pid != s->control_pid)
1536                 return;
1537
1538         s->control_pid = 0;
1539
1540         success = is_clean_exit(code, status);
1541
1542         if (s->control_command) {
1543                 exec_status_exit(&s->control_command->exec_status, pid, code, status);
1544
1545                 if (s->control_command->ignore)
1546                         success = true;
1547         }
1548
1549         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1550                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1551         s->failure = s->failure || !success;
1552
1553         if (s->control_command && s->control_command->command_next && success) {
1554                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1555                 socket_run_next(s, success);
1556         } else {
1557                 s->control_command = NULL;
1558                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1559
1560                 /* No further commands for this step, so let's figure
1561                  * out what to do next */
1562
1563                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1564
1565                 switch (s->state) {
1566
1567                 case SOCKET_START_PRE:
1568                         if (success)
1569                                 socket_enter_start_post(s);
1570                         else
1571                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1572                         break;
1573
1574                 case SOCKET_START_POST:
1575                         if (success)
1576                                 socket_enter_listening(s);
1577                         else
1578                                 socket_enter_stop_pre(s, false);
1579                         break;
1580
1581                 case SOCKET_STOP_PRE:
1582                 case SOCKET_STOP_PRE_SIGTERM:
1583                 case SOCKET_STOP_PRE_SIGKILL:
1584                         socket_enter_stop_post(s, success);
1585                         break;
1586
1587                 case SOCKET_STOP_POST:
1588                 case SOCKET_FINAL_SIGTERM:
1589                 case SOCKET_FINAL_SIGKILL:
1590                         socket_enter_dead(s, success);
1591                         break;
1592
1593                 default:
1594                         assert_not_reached("Uh, control process died at wrong time.");
1595                 }
1596         }
1597 }
1598
1599 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1600         Socket *s = SOCKET(u);
1601
1602         assert(s);
1603         assert(elapsed == 1);
1604         assert(w == &s->timer_watch);
1605
1606         switch (s->state) {
1607
1608         case SOCKET_START_PRE:
1609                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1610                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1611
1612         case SOCKET_START_POST:
1613                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1614                 socket_enter_stop_pre(s, false);
1615                 break;
1616
1617         case SOCKET_STOP_PRE:
1618                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1619                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1620                 break;
1621
1622         case SOCKET_STOP_PRE_SIGTERM:
1623                 log_warning("%s stopping timed out. Killing.", u->meta.id);
1624                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1625                 break;
1626
1627         case SOCKET_STOP_PRE_SIGKILL:
1628                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1629                 socket_enter_stop_post(s, false);
1630                 break;
1631
1632         case SOCKET_STOP_POST:
1633                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1634                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1635                 break;
1636
1637         case SOCKET_FINAL_SIGTERM:
1638                 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1639                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1640                 break;
1641
1642         case SOCKET_FINAL_SIGKILL:
1643                 log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
1644                 socket_enter_dead(s, false);
1645                 break;
1646
1647         default:
1648                 assert_not_reached("Timeout at wrong time.");
1649         }
1650 }
1651
1652 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1653         int *rfds;
1654         unsigned rn_fds, k;
1655         SocketPort *p;
1656
1657         assert(s);
1658         assert(fds);
1659         assert(n_fds);
1660
1661         /* Called from the service code for requesting our fds */
1662
1663         rn_fds = 0;
1664         LIST_FOREACH(port, p, s->ports)
1665                 if (p->fd >= 0)
1666                         rn_fds++;
1667
1668         if (!(rfds = new(int, rn_fds)) < 0)
1669                 return -ENOMEM;
1670
1671         k = 0;
1672         LIST_FOREACH(port, p, s->ports)
1673                 if (p->fd >= 0)
1674                         rfds[k++] = p->fd;
1675
1676         assert(k == rn_fds);
1677
1678         *fds = rfds;
1679         *n_fds = rn_fds;
1680
1681         return 0;
1682 }
1683
1684 void socket_notify_service_dead(Socket *s) {
1685         assert(s);
1686
1687         /* The service is dead. Dang!
1688          *
1689          * This is strictly for one-instance-for-all-connections
1690          * services. */
1691
1692         if (s->state == SOCKET_RUNNING) {
1693                 log_debug("%s got notified about service death.", s->meta.id);
1694                 socket_enter_listening(s);
1695         }
1696 }
1697
1698 void socket_connection_unref(Socket *s) {
1699         assert(s);
1700
1701         /* The service is dead. Yay!
1702          *
1703          * This is strictly for one-onstance-per-connection
1704          * services. */
1705
1706         assert(s->n_connections > 0);
1707         s->n_connections--;
1708
1709         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1710 }
1711
1712 static void socket_reset_maintenance(Unit *u) {
1713         Socket *s = SOCKET(u);
1714
1715         assert(s);
1716
1717         if (s->state == SOCKET_MAINTENANCE)
1718                 socket_set_state(s, SOCKET_DEAD);
1719
1720         s->failure = false;
1721 }
1722
1723 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1724         [SOCKET_DEAD] = "dead",
1725         [SOCKET_START_PRE] = "start-pre",
1726         [SOCKET_START_POST] = "start-post",
1727         [SOCKET_LISTENING] = "listening",
1728         [SOCKET_RUNNING] = "running",
1729         [SOCKET_STOP_PRE] = "stop-pre",
1730         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1731         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1732         [SOCKET_STOP_POST] = "stop-post",
1733         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1734         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1735         [SOCKET_MAINTENANCE] = "maintenance"
1736 };
1737
1738 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1739
1740 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1741         [SOCKET_EXEC_START_PRE] = "StartPre",
1742         [SOCKET_EXEC_START_POST] = "StartPost",
1743         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1744         [SOCKET_EXEC_STOP_POST] = "StopPost"
1745 };
1746
1747 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1748
1749 const UnitVTable socket_vtable = {
1750         .suffix = ".socket",
1751
1752         .init = socket_init,
1753         .done = socket_done,
1754         .load = socket_load,
1755
1756         .coldplug = socket_coldplug,
1757
1758         .dump = socket_dump,
1759
1760         .start = socket_start,
1761         .stop = socket_stop,
1762
1763         .serialize = socket_serialize,
1764         .deserialize_item = socket_deserialize_item,
1765
1766         .active_state = socket_active_state,
1767         .sub_state_to_string = socket_sub_state_to_string,
1768
1769         .check_gc = socket_check_gc,
1770
1771         .fd_event = socket_fd_event,
1772         .sigchld_event = socket_sigchld_event,
1773         .timer_event = socket_timer_event,
1774
1775         .reset_maintenance = socket_reset_maintenance,
1776
1777         .bus_message_handler = bus_socket_message_handler
1778 };