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