src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29 #include <arpa/inet.h>
  30
  31 #include "unit.h"
  32 #include "socket.h"
  33 #include "netinet/tcp.h"
  34 #include "log.h"
  35 #include "load-dropin.h"
  36 #include "load-fragment.h"
  37 #include "strv.h"
  38 #include "unit-name.h"
  39 #include "dbus-socket.h"
  40 #include "missing.h"
  41 #include "special.h"
  42 #include "bus-errors.h"
  43 #include "label.h"
  44
  45 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  46         [SOCKET_DEAD] = UNIT_INACTIVE,
  47         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  48         [SOCKET_START_POST] = UNIT_ACTIVATING,
  49         [SOCKET_LISTENING] = UNIT_ACTIVE,
  50         [SOCKET_RUNNING] = UNIT_ACTIVE,
  51         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  52         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  53         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  54         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  55         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  56         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  57         [SOCKET_FAILED] = UNIT_FAILED
  58 };
  59
  60 static void socket_init(Unit *u) {
  61         Socket *s = SOCKET(u);
  62
  63         assert(u);
  64         assert(u->meta.load_state == UNIT_STUB);
  65
  66         s->backlog = SOMAXCONN;
  67         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  68         s->directory_mode = 0755;
  69         s->socket_mode = 0666;
  70
  71         s->max_connections = 64;
  72
  73         s->priority = -1;
  74         s->ip_tos = -1;
  75         s->ip_ttl = -1;
  76         s->mark = -1;
  77
  78         exec_context_init(&s->exec_context);
  79
  80         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  81 }
  82
  83 static void socket_unwatch_control_pid(Socket *s) {
  84         assert(s);
  85
  86         if (s->control_pid <= 0)
  87                 return;
  88
  89         unit_unwatch_pid(UNIT(s), s->control_pid);
  90         s->control_pid = 0;
  91 }
  92
  93 static void socket_done(Unit *u) {
  94         Socket *s = SOCKET(u);
  95         SocketPort *p;
  96         Meta *i;
  97
  98         assert(s);
  99
 100         while ((p = s->ports)) {
 101                 LIST_REMOVE(SocketPort, port, s->ports, p);
 102
 103                 if (p->fd >= 0) {
 104                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 105                         close_nointr_nofail(p->fd);
 106                 }
 107
 108                 free(p->path);
 109                 free(p);
 110         }
 111
 112         exec_context_done(&s->exec_context);
 113         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 114         s->control_command = NULL;
 115
 116         socket_unwatch_control_pid(s);
 117
 118         s->service = NULL;
 119
 120         free(s->tcp_congestion);
 121         s->tcp_congestion = NULL;
 122
 123         free(s->bind_to_device);
 124         s->bind_to_device = NULL;
 125
 126         unit_unwatch_timer(u, &s->timer_watch);
 127
 128         /* Make sure no service instance refers to us anymore. */
 129         LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
 130                 Service *service = (Service *) i;
 131
 132                 if (service->accept_socket == s)
 133                         service->accept_socket = NULL;
 134
 135                 set_remove(service->configured_sockets, s);
 136         }
 137 }
 138
 139 static int socket_instantiate_service(Socket *s) {
 140         char *prefix, *name;
 141         int r;
 142         Unit *u;
 143
 144         assert(s);
 145
 146         /* This fills in s->service if it isn't filled in yet. For
 147          * Accept=yes sockets we create the next connection service
 148          * here. For Accept=no this is mostly a NOP since the service
 149          * is figured out at load time anyway. */
 150
 151         if (s->service)
 152                 return 0;
 153
 154         assert(s->accept);
 155
 156         if (!(prefix = unit_name_to_prefix(s->meta.id)))
 157                 return -ENOMEM;
 158
 159         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 160         free(prefix);
 161
 162         if (r < 0)
 163                 return -ENOMEM;
 164
 165         r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
 166         free(name);
 167
 168         if (r < 0)
 169                 return r;
 170
 171         u->meta.no_gc = true;
 172         s->service = SERVICE(u);
 173         return 0;
 174 }
 175
 176 static bool have_non_accept_socket(Socket *s) {
 177         SocketPort *p;
 178
 179         assert(s);
 180
 181         if (!s->accept)
 182                 return true;
 183
 184         LIST_FOREACH(port, p, s->ports) {
 185
 186                 if (p->type != SOCKET_SOCKET)
 187                         return true;
 188
 189                 if (!socket_address_can_accept(&p->address))
 190                         return true;
 191         }
 192
 193         return false;
 194 }
 195
 196 static int socket_verify(Socket *s) {
 197         assert(s);
 198
 199         if (s->meta.load_state != UNIT_LOADED)
 200                 return 0;
 201
 202         if (!s->ports) {
 203                 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
 204                 return -EINVAL;
 205         }
 206
 207         if (s->accept && have_non_accept_socket(s)) {
 208                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
 209                 return -EINVAL;
 210         }
 211
 212         if (s->accept && s->max_connections <= 0) {
 213                 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
 214                 return -EINVAL;
 215         }
 216
 217         if (s->accept && s->service) {
 218                 log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", s->meta.id);
 219                 return -EINVAL;
 220         }
 221
 222         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 223                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
 224                 return -EINVAL;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static bool socket_needs_mount(Socket *s, const char *prefix) {
 231         SocketPort *p;
 232
 233         assert(s);
 234
 235         LIST_FOREACH(port, p, s->ports) {
 236
 237                 if (p->type == SOCKET_SOCKET) {
 238                         if (socket_address_needs_mount(&p->address, prefix))
 239                                 return true;
 240                 } else {
 241                         assert(p->type == SOCKET_FIFO);
 242                         if (path_startswith(p->path, prefix))
 243                                 return true;
 244                 }
 245         }
 246
 247         return false;
 248 }
 249
 250 int socket_add_one_mount_link(Socket *s, Mount *m) {
 251         int r;
 252
 253         assert(s);
 254         assert(m);
 255
 256         if (s->meta.load_state != UNIT_LOADED ||
 257             m->meta.load_state != UNIT_LOADED)
 258                 return 0;
 259
 260         if (!socket_needs_mount(s, m->where))
 261                 return 0;
 262
 263         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 264                 return r;
 265
 266         return 0;
 267 }
 268
 269 static int socket_add_mount_links(Socket *s) {
 270         Meta *other;
 271         int r;
 272
 273         assert(s);
 274
 275         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 276                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 277                         return r;
 278
 279         return 0;
 280 }
 281
 282 static int socket_add_device_link(Socket *s) {
 283         char *t;
 284         int r;
 285
 286         assert(s);
 287
 288         if (!s->bind_to_device)
 289                 return 0;
 290
 291         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 292                 return -ENOMEM;
 293
 294         r = unit_add_node_link(UNIT(s), t, false);
 295         free(t);
 296
 297         return r;
 298 }
 299
 300 static int socket_add_default_dependencies(Socket *s) {
 301         int r;
 302         assert(s);
 303
 304         if (s->meta.manager->running_as == MANAGER_SYSTEM)
 305                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 306                         return r;
 307
 308         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 309 }
 310
 311 static int socket_load(Unit *u) {
 312         Socket *s = SOCKET(u);
 313         int r;
 314
 315         assert(u);
 316         assert(u->meta.load_state == UNIT_STUB);
 317
 318         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 319                 return r;
 320
 321         /* This is a new unit? Then let's add in some extras */
 322         if (u->meta.load_state == UNIT_LOADED) {
 323
 324                 if (have_non_accept_socket(s)) {
 325
 326                         if (!s->service)
 327                                 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
 328                                         return r;
 329
 330                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 331                                 return r;
 332                 }
 333
 334                 if ((r = socket_add_mount_links(s)) < 0)
 335                         return r;
 336
 337                 if ((r = socket_add_device_link(s)) < 0)
 338                         return r;
 339
 340                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 341                         return r;
 342
 343                 if ((r = unit_add_default_cgroup(u)) < 0)
 344                         return r;
 345
 346                 if (s->meta.default_dependencies)
 347                         if ((r = socket_add_default_dependencies(s)) < 0)
 348                                 return r;
 349         }
 350
 351         return socket_verify(s);
 352 }
 353
 354 static const char* listen_lookup(int type) {
 355
 356         if (type == SOCK_STREAM)
 357                 return "ListenStream";
 358         else if (type == SOCK_DGRAM)
 359                 return "ListenDatagram";
 360         else if (type == SOCK_SEQPACKET)
 361                 return "ListenSequentialPacket";
 362
 363         assert_not_reached("Unknown socket type");
 364         return NULL;
 365 }
 366
 367 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 368
 369         SocketExecCommand c;
 370         Socket *s = SOCKET(u);
 371         SocketPort *p;
 372         const char *prefix2;
 373         char *p2;
 374
 375         assert(s);
 376         assert(f);
 377
 378         p2 = strappend(prefix, "\t");
 379         prefix2 = p2 ? p2 : prefix;
 380
 381         fprintf(f,
 382                 "%sSocket State: %s\n"
 383                 "%sBindIPv6Only: %s\n"
 384                 "%sBacklog: %u\n"
 385                 "%sSocketMode: %04o\n"
 386                 "%sDirectoryMode: %04o\n"
 387                 "%sKeepAlive: %s\n"
 388                 "%sFreeBind: %s\n"
 389                 "%sTCPCongestion: %s\n",
 390                 prefix, socket_state_to_string(s->state),
 391                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 392                 prefix, s->backlog,
 393                 prefix, s->socket_mode,
 394                 prefix, s->directory_mode,
 395                 prefix, yes_no(s->keep_alive),
 396                 prefix, yes_no(s->free_bind),
 397                 prefix, strna(s->tcp_congestion));
 398
 399         if (s->control_pid > 0)
 400                 fprintf(f,
 401                         "%sControl PID: %lu\n",
 402                         prefix, (unsigned long) s->control_pid);
 403
 404         if (s->bind_to_device)
 405                 fprintf(f,
 406                         "%sBindToDevice: %s\n",
 407                         prefix, s->bind_to_device);
 408
 409         if (s->accept)
 410                 fprintf(f,
 411                         "%sAccepted: %u\n"
 412                         "%sNConnections: %u\n"
 413                         "%sMaxConnections: %u\n",
 414                         prefix, s->n_accepted,
 415                         prefix, s->n_connections,
 416                         prefix, s->max_connections);
 417
 418         if (s->priority >= 0)
 419                 fprintf(f,
 420                         "%sPriority: %i\n",
 421                         prefix, s->priority);
 422
 423         if (s->receive_buffer > 0)
 424                 fprintf(f,
 425                         "%sReceiveBuffer: %zu\n",
 426                         prefix, s->receive_buffer);
 427
 428         if (s->send_buffer > 0)
 429                 fprintf(f,
 430                         "%sSendBuffer: %zu\n",
 431                         prefix, s->send_buffer);
 432
 433         if (s->ip_tos >= 0)
 434                 fprintf(f,
 435                         "%sIPTOS: %i\n",
 436                         prefix, s->ip_tos);
 437
 438         if (s->ip_ttl >= 0)
 439                 fprintf(f,
 440                         "%sIPTTL: %i\n",
 441                         prefix, s->ip_ttl);
 442
 443         if (s->pipe_size > 0)
 444                 fprintf(f,
 445                         "%sPipeSize: %zu\n",
 446                         prefix, s->pipe_size);
 447
 448         if (s->mark >= 0)
 449                 fprintf(f,
 450                         "%sMark: %i\n",
 451                         prefix, s->mark);
 452
 453         LIST_FOREACH(port, p, s->ports) {
 454
 455                 if (p->type == SOCKET_SOCKET) {
 456                         const char *t;
 457                         int r;
 458                         char *k = NULL;
 459
 460                         if ((r = socket_address_print(&p->address, &k)) < 0)
 461                                 t = strerror(-r);
 462                         else
 463                                 t = k;
 464
 465                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t);
 466                         free(k);
 467                 } else
 468                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 469         }
 470
 471         exec_context_dump(&s->exec_context, f, prefix);
 472
 473         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 474                 if (!s->exec_command[c])
 475                         continue;
 476
 477                 fprintf(f, "%s-> %s:\n",
 478                         prefix, socket_exec_command_to_string(c));
 479
 480                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 481         }
 482
 483         free(p2);
 484 }
 485
 486 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 487         socklen_t l;
 488         char *r;
 489         union {
 490                 struct sockaddr sa;
 491                 struct sockaddr_un un;
 492                 struct sockaddr_in in;
 493                 struct sockaddr_in6 in6;
 494                 struct sockaddr_storage storage;
 495         } local, remote;
 496
 497         assert(fd >= 0);
 498         assert(instance);
 499
 500         l = sizeof(local);
 501         if (getsockname(fd, &local.sa, &l) < 0)
 502                 return -errno;
 503
 504         l = sizeof(remote);
 505         if (getpeername(fd, &remote.sa, &l) < 0)
 506                 return -errno;
 507
 508         switch (local.sa.sa_family) {
 509
 510         case AF_INET: {
 511                 uint32_t
 512                         a = ntohl(local.in.sin_addr.s_addr),
 513                         b = ntohl(remote.in.sin_addr.s_addr);
 514
 515                 if (asprintf(&r,
 516                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 517                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 518                              ntohs(local.in.sin_port),
 519                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 520                              ntohs(remote.in.sin_port)) < 0)
 521                         return -ENOMEM;
 522
 523                 break;
 524         }
 525
 526         case AF_INET6: {
 527                 static const char ipv4_prefix[] = {
 528                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 529                 };
 530
 531                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 532                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 533                         const uint8_t
 534                                 *a = local.in6.sin6_addr.s6_addr+12,
 535                                 *b = remote.in6.sin6_addr.s6_addr+12;
 536
 537                         if (asprintf(&r,
 538                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 539                                      a[0], a[1], a[2], a[3],
 540                                      ntohs(local.in6.sin6_port),
 541                                      b[0], b[1], b[2], b[3],
 542                                      ntohs(remote.in6.sin6_port)) < 0)
 543                                 return -ENOMEM;
 544                 } else {
 545                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 546
 547                         if (asprintf(&r,
 548                                      "%s:%u-%s:%u",
 549                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 550                                      ntohs(local.in6.sin6_port),
 551                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 552                                      ntohs(remote.in6.sin6_port)) < 0)
 553                                 return -ENOMEM;
 554                 }
 555
 556                 break;
 557         }
 558
 559         case AF_UNIX: {
 560                 struct ucred ucred;
 561
 562                 l = sizeof(ucred);
 563                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 564                         return -errno;
 565
 566                 if (asprintf(&r,
 567                              "%u-%lu-%lu",
 568                              nr,
 569                              (unsigned long) ucred.pid,
 570                              (unsigned long) ucred.uid) < 0)
 571                         return -ENOMEM;
 572
 573                 break;
 574         }
 575
 576         default:
 577                 assert_not_reached("Unhandled socket type.");
 578         }
 579
 580         *instance = r;
 581         return 0;
 582 }
 583
 584 static void socket_close_fds(Socket *s) {
 585         SocketPort *p;
 586
 587         assert(s);
 588
 589         LIST_FOREACH(port, p, s->ports) {
 590                 if (p->fd < 0)
 591                         continue;
 592
 593                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 594                 close_nointr_nofail(p->fd);
 595
 596                 /* One little note: we should never delete any sockets
 597                  * in the file system here! After all some other
 598                  * process we spawned might still have a reference of
 599                  * this fd and wants to continue to use it. Therefore
 600                  * we delete sockets in the file system before we
 601                  * create a new one, not after we stopped using
 602                  * one! */
 603
 604                 p->fd = -1;
 605         }
 606 }
 607
 608 static void socket_apply_socket_options(Socket *s, int fd) {
 609         assert(s);
 610         assert(fd >= 0);
 611
 612         if (s->keep_alive) {
 613                 int b = s->keep_alive;
 614                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 615                         log_warning("SO_KEEPALIVE failed: %m");
 616         }
 617
 618         if (s->priority >= 0)
 619                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 620                         log_warning("SO_PRIORITY failed: %m");
 621
 622         if (s->receive_buffer > 0) {
 623                 int value = (int) s->receive_buffer;
 624                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 625                         log_warning("SO_RCVBUF failed: %m");
 626         }
 627
 628         if (s->send_buffer > 0) {
 629                 int value = (int) s->send_buffer;
 630                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 631                         log_warning("SO_SNDBUF failed: %m");
 632         }
 633
 634         if (s->mark >= 0)
 635                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 636                         log_warning("SO_MARK failed: %m");
 637
 638         if (s->ip_tos >= 0)
 639                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 640                         log_warning("IP_TOS failed: %m");
 641
 642         if (s->ip_ttl >= 0) {
 643                 int r, x;
 644
 645                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 646
 647                 if (socket_ipv6_is_supported())
 648                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 649                 else {
 650                         x = -1;
 651                         errno = EAFNOSUPPORT;
 652                 }
 653
 654                 if (r < 0 && x < 0)
 655                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 656         }
 657
 658         if (s->tcp_congestion)
 659                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 660                         log_warning("TCP_CONGESTION failed: %m");
 661 }
 662
 663 static void socket_apply_fifo_options(Socket *s, int fd) {
 664         assert(s);
 665         assert(fd >= 0);
 666
 667         if (s->pipe_size > 0)
 668                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 669                         log_warning("F_SETPIPE_SZ: %m");
 670 }
 671
 672
 673 static int fifo_address_create(
 674                 const char *path,
 675                 mode_t directory_mode,
 676                 mode_t socket_mode,
 677                 int *_fd) {
 678
 679         int fd = -1, r = 0;
 680         struct stat st;
 681         mode_t old_mask;
 682
 683         assert(path);
 684         assert(_fd);
 685
 686         mkdir_parents(path, directory_mode);
 687
 688         if ((r = label_fifofile_set(path)) < 0)
 689                 goto fail;
 690
 691         /* Enforce the right access mode for the fifo */
 692         old_mask = umask(~ socket_mode);
 693
 694         /* Include the original umask in our mask */
 695         umask(~socket_mode | old_mask);
 696
 697         r = mkfifo(path, socket_mode);
 698         umask(old_mask);
 699
 700         if (r < 0) {
 701                 r = -errno;
 702                 goto fail;
 703         }
 704
 705         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 706                 r = -errno;
 707                 goto fail;
 708         }
 709
 710         label_file_clear();
 711
 712         if (fstat(fd, &st) < 0) {
 713                 r = -errno;
 714                 goto fail;
 715         }
 716
 717         if (!S_ISFIFO(st.st_mode) ||
 718             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 719             st.st_uid != getuid() ||
 720             st.st_gid != getgid()) {
 721
 722                 r = -EEXIST;
 723                 goto fail;
 724         }
 725
 726         *_fd = fd;
 727         return 0;
 728
 729 fail:
 730         label_file_clear();
 731
 732         if (fd >= 0)
 733                 close_nointr_nofail(fd);
 734
 735         return r;
 736 }
 737
 738 static int socket_open_fds(Socket *s) {
 739         SocketPort *p;
 740         int r;
 741         char *label = NULL;
 742         bool know_label = false;
 743
 744         assert(s);
 745
 746         LIST_FOREACH(port, p, s->ports) {
 747
 748                 if (p->fd >= 0)
 749                         continue;
 750
 751                 if (p->type == SOCKET_SOCKET) {
 752
 753                         if (!know_label) {
 754
 755                                 if ((r = socket_instantiate_service(s)) < 0)
 756                                         return r;
 757
 758                                 if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
 759                                         return r;
 760
 761                                 know_label = true;
 762                         }
 763
 764                         if ((r = socket_address_listen(
 765                                              &p->address,
 766                                              s->backlog,
 767                                              s->bind_ipv6_only,
 768                                              s->bind_to_device,
 769                                              s->free_bind,
 770                                              s->directory_mode,
 771                                              s->socket_mode,
 772                                              label,
 773                                              &p->fd)) < 0)
 774                                 goto rollback;
 775
 776                         socket_apply_socket_options(s, p->fd);
 777
 778                 } else  if (p->type == SOCKET_FIFO) {
 779
 780                         if ((r = fifo_address_create(
 781                                              p->path,
 782                                              s->directory_mode,
 783                                              s->socket_mode,
 784                                              &p->fd)) < 0)
 785                                 goto rollback;
 786
 787                         socket_apply_fifo_options(s, p->fd);
 788
 789                 } else
 790                         assert_not_reached("Unknown port type");
 791         }
 792
 793         label_free(label);
 794         return 0;
 795
 796 rollback:
 797         socket_close_fds(s);
 798         label_free(label);
 799         return r;
 800 }
 801
 802 static void socket_unwatch_fds(Socket *s) {
 803         SocketPort *p;
 804
 805         assert(s);
 806
 807         LIST_FOREACH(port, p, s->ports) {
 808                 if (p->fd < 0)
 809                         continue;
 810
 811                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 812         }
 813 }
 814
 815 static int socket_watch_fds(Socket *s) {
 816         SocketPort *p;
 817         int r;
 818
 819         assert(s);
 820
 821         LIST_FOREACH(port, p, s->ports) {
 822                 if (p->fd < 0)
 823                         continue;
 824
 825                 p->fd_watch.socket_accept =
 826                         s->accept &&
 827                         p->type == SOCKET_SOCKET &&
 828                         socket_address_can_accept(&p->address);
 829
 830                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 831                         goto fail;
 832         }
 833
 834         return 0;
 835
 836 fail:
 837         socket_unwatch_fds(s);
 838         return r;
 839 }
 840
 841 static void socket_set_state(Socket *s, SocketState state) {
 842         SocketState old_state;
 843         assert(s);
 844
 845         old_state = s->state;
 846         s->state = state;
 847
 848         if (state != SOCKET_START_PRE &&
 849             state != SOCKET_START_POST &&
 850             state != SOCKET_STOP_PRE &&
 851             state != SOCKET_STOP_PRE_SIGTERM &&
 852             state != SOCKET_STOP_PRE_SIGKILL &&
 853             state != SOCKET_STOP_POST &&
 854             state != SOCKET_FINAL_SIGTERM &&
 855             state != SOCKET_FINAL_SIGKILL) {
 856                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 857                 socket_unwatch_control_pid(s);
 858                 s->control_command = NULL;
 859                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 860         }
 861
 862         if (state != SOCKET_LISTENING)
 863                 socket_unwatch_fds(s);
 864
 865         if (state != SOCKET_START_POST &&
 866             state != SOCKET_LISTENING &&
 867             state != SOCKET_RUNNING &&
 868             state != SOCKET_STOP_PRE &&
 869             state != SOCKET_STOP_PRE_SIGTERM &&
 870             state != SOCKET_STOP_PRE_SIGKILL)
 871                 socket_close_fds(s);
 872
 873         if (state != old_state)
 874                 log_debug("%s changed %s -> %s",
 875                           s->meta.id,
 876                           socket_state_to_string(old_state),
 877                           socket_state_to_string(state));
 878
 879         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 880 }
 881
 882 static int socket_coldplug(Unit *u) {
 883         Socket *s = SOCKET(u);
 884         int r;
 885
 886         assert(s);
 887         assert(s->state == SOCKET_DEAD);
 888
 889         if (s->deserialized_state != s->state) {
 890
 891                 if (s->deserialized_state == SOCKET_START_PRE ||
 892                     s->deserialized_state == SOCKET_START_POST ||
 893                     s->deserialized_state == SOCKET_STOP_PRE ||
 894                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 895                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 896                     s->deserialized_state == SOCKET_STOP_POST ||
 897                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 898                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 899
 900                         if (s->control_pid <= 0)
 901                                 return -EBADMSG;
 902
 903                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 904                                 return r;
 905
 906                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 907                                 return r;
 908                 }
 909
 910                 if (s->deserialized_state == SOCKET_START_POST ||
 911                     s->deserialized_state == SOCKET_LISTENING ||
 912                     s->deserialized_state == SOCKET_RUNNING ||
 913                     s->deserialized_state == SOCKET_STOP_PRE ||
 914                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 915                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 916                         if ((r = socket_open_fds(s)) < 0)
 917                                 return r;
 918
 919                 if (s->deserialized_state == SOCKET_LISTENING)
 920                         if ((r = socket_watch_fds(s)) < 0)
 921                                 return r;
 922
 923                 socket_set_state(s, s->deserialized_state);
 924         }
 925
 926         return 0;
 927 }
 928
 929 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 930         pid_t pid;
 931         int r;
 932         char **argv;
 933
 934         assert(s);
 935         assert(c);
 936         assert(_pid);
 937
 938         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 939                 goto fail;
 940
 941         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 942                 r = -ENOMEM;
 943                 goto fail;
 944         }
 945
 946         r = exec_spawn(c,
 947                        argv,
 948                        &s->exec_context,
 949                        NULL, 0,
 950                        s->meta.manager->environment,
 951                        true,
 952                        true,
 953                        true,
 954                        s->meta.manager->confirm_spawn,
 955                        s->meta.cgroup_bondings,
 956                        &pid);
 957
 958         strv_free(argv);
 959         if (r < 0)
 960                 goto fail;
 961
 962         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 963                 /* FIXME: we need to do something here */
 964                 goto fail;
 965
 966         *_pid = pid;
 967
 968         return 0;
 969
 970 fail:
 971         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 972
 973         return r;
 974 }
 975
 976 static void socket_enter_dead(Socket *s, bool success) {
 977         assert(s);
 978
 979         if (!success)
 980                 s->failure = true;
 981
 982         socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
 983 }
 984
 985 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 986
 987 static void socket_enter_stop_post(Socket *s, bool success) {
 988         int r;
 989         assert(s);
 990
 991         if (!success)
 992                 s->failure = true;
 993
 994         socket_unwatch_control_pid(s);
 995
 996         s->control_command_id = SOCKET_EXEC_STOP_POST;
 997
 998         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 999                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1000                         goto fail;
1001
1002                 socket_set_state(s, SOCKET_STOP_POST);
1003         } else
1004                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
1005
1006         return;
1007
1008 fail:
1009         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
1010         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1011 }
1012
1013 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1014         int r;
1015         Set *pid_set = NULL;
1016         bool wait_for_exit = false;
1017
1018         assert(s);
1019
1020         if (!success)
1021                 s->failure = true;
1022
1023         if (s->exec_context.kill_mode != KILL_NONE) {
1024                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1025
1026                 if (s->control_pid > 0) {
1027                         if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
1028                                  -s->control_pid :
1029                                  s->control_pid, sig) < 0 && errno != ESRCH)
1030
1031                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1032                         else
1033                                 wait_for_exit = true;
1034                 }
1035
1036                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1037
1038                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1039                                 r = -ENOMEM;
1040                                 goto fail;
1041                         }
1042
1043                         /* Exclude the control pid from being killed via the cgroup */
1044                         if (s->control_pid > 0)
1045                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1046                                         goto fail;
1047
1048                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) {
1049                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1050                                         log_warning("Failed to kill control group: %s", strerror(-r));
1051                         } else if (r > 0)
1052                                 wait_for_exit = true;
1053
1054                         set_free(pid_set);
1055                 }
1056         }
1057
1058         if (wait_for_exit) {
1059                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1060                         goto fail;
1061
1062                 socket_set_state(s, state);
1063         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1064                 socket_enter_stop_post(s, true);
1065         else
1066                 socket_enter_dead(s, true);
1067
1068         return;
1069
1070 fail:
1071         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1072
1073         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1074                 socket_enter_stop_post(s, false);
1075         else
1076                 socket_enter_dead(s, false);
1077
1078         if (pid_set)
1079                 set_free(pid_set);
1080 }
1081
1082 static void socket_enter_stop_pre(Socket *s, bool success) {
1083         int r;
1084         assert(s);
1085
1086         if (!success)
1087                 s->failure = true;
1088
1089         socket_unwatch_control_pid(s);
1090
1091         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1092
1093         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1094                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1095                         goto fail;
1096
1097                 socket_set_state(s, SOCKET_STOP_PRE);
1098         } else
1099                 socket_enter_stop_post(s, true);
1100
1101         return;
1102
1103 fail:
1104         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1105         socket_enter_stop_post(s, false);
1106 }
1107
1108 static void socket_enter_listening(Socket *s) {
1109         int r;
1110         assert(s);
1111
1112         if ((r = socket_watch_fds(s)) < 0) {
1113                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1114                 goto fail;
1115         }
1116
1117         socket_set_state(s, SOCKET_LISTENING);
1118         return;
1119
1120 fail:
1121         socket_enter_stop_pre(s, false);
1122 }
1123
1124 static void socket_enter_start_post(Socket *s) {
1125         int r;
1126         assert(s);
1127
1128         if ((r = socket_open_fds(s)) < 0) {
1129                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1130                 goto fail;
1131         }
1132
1133         socket_unwatch_control_pid(s);
1134
1135         s->control_command_id = SOCKET_EXEC_START_POST;
1136
1137         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1138                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1139                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1140                         goto fail;
1141                 }
1142
1143                 socket_set_state(s, SOCKET_START_POST);
1144         } else
1145                 socket_enter_listening(s);
1146
1147         return;
1148
1149 fail:
1150         socket_enter_stop_pre(s, false);
1151 }
1152
1153 static void socket_enter_start_pre(Socket *s) {
1154         int r;
1155         assert(s);
1156
1157         socket_unwatch_control_pid(s);
1158
1159         s->control_command_id = SOCKET_EXEC_START_PRE;
1160
1161         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1162                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1163                         goto fail;
1164
1165                 socket_set_state(s, SOCKET_START_PRE);
1166         } else
1167                 socket_enter_start_post(s);
1168
1169         return;
1170
1171 fail:
1172         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1173         socket_enter_dead(s, false);
1174 }
1175
1176 static void socket_enter_running(Socket *s, int cfd) {
1177         int r;
1178         DBusError error;
1179
1180         assert(s);
1181         dbus_error_init(&error);
1182
1183         /* We don't take connections anymore if we are supposed to
1184          * shut down anyway */
1185         if (unit_pending_inactive(UNIT(s))) {
1186                 if (cfd >= 0)
1187                         close_nointr_nofail(cfd);
1188                 else  {
1189                         /* Flush all sockets by closing and reopening them */
1190                         socket_close_fds(s);
1191
1192                         if ((r = socket_watch_fds(s)) < 0) {
1193                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1194                                 socket_enter_stop_pre(s, false);
1195                         }
1196                 }
1197
1198                 return;
1199         }
1200
1201         if (cfd < 0) {
1202                 bool pending = false;
1203                 Meta *i;
1204
1205                 /* If there's already a start pending don't bother to
1206                  * do anything */
1207                 LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
1208                         Service *service = (Service *) i;
1209
1210                         if (!set_get(service->configured_sockets, s))
1211                                 continue;
1212
1213                         if (!unit_pending_active(UNIT(service)))
1214                                 continue;
1215
1216                         pending = true;
1217                         break;
1218                 }
1219
1220                 if (!pending)
1221                         if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1222                                 goto fail;
1223
1224                 socket_set_state(s, SOCKET_RUNNING);
1225         } else {
1226                 char *prefix, *instance = NULL, *name;
1227                 Service *service;
1228
1229                 if (s->n_connections >= s->max_connections) {
1230                         log_warning("Too many incoming connections (%u)", s->n_connections);
1231                         close_nointr_nofail(cfd);
1232                         return;
1233                 }
1234
1235                 if ((r = socket_instantiate_service(s)) < 0)
1236                         goto fail;
1237
1238                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1239                         goto fail;
1240
1241                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1242                         free(instance);
1243                         r = -ENOMEM;
1244                         goto fail;
1245                 }
1246
1247                 name = unit_name_build(prefix, instance, ".service");
1248                 free(prefix);
1249                 free(instance);
1250
1251                 if (!name) {
1252                         r = -ENOMEM;
1253                         goto fail;
1254                 }
1255
1256                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1257                         free(name);
1258                         goto fail;
1259                 }
1260
1261                 service = s->service;
1262                 s->service = NULL;
1263                 s->n_accepted ++;
1264
1265                 service->meta.no_gc = false;
1266
1267                 unit_choose_id(UNIT(service), name);
1268                 free(name);
1269
1270                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1271                         goto fail;
1272
1273                 cfd = -1;
1274                 s->n_connections ++;
1275
1276                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1277                         goto fail;
1278
1279                 /* Notify clients about changed counters */
1280                 unit_add_to_dbus_queue(UNIT(s));
1281         }
1282
1283         return;
1284
1285 fail:
1286         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1287         socket_enter_stop_pre(s, false);
1288
1289         if (cfd >= 0)
1290                 close_nointr_nofail(cfd);
1291
1292         dbus_error_free(&error);
1293 }
1294
1295 static void socket_run_next(Socket *s, bool success) {
1296         int r;
1297
1298         assert(s);
1299         assert(s->control_command);
1300         assert(s->control_command->command_next);
1301
1302         if (!success)
1303                 s->failure = true;
1304
1305         socket_unwatch_control_pid(s);
1306
1307         s->control_command = s->control_command->command_next;
1308
1309         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1310                 goto fail;
1311
1312         return;
1313
1314 fail:
1315         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1316
1317         if (s->state == SOCKET_START_POST)
1318                 socket_enter_stop_pre(s, false);
1319         else if (s->state == SOCKET_STOP_POST)
1320                 socket_enter_dead(s, false);
1321         else
1322                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1323 }
1324
1325 static int socket_start(Unit *u) {
1326         Socket *s = SOCKET(u);
1327
1328         assert(s);
1329
1330         /* We cannot fulfill this request right now, try again later
1331          * please! */
1332         if (s->state == SOCKET_STOP_PRE ||
1333             s->state == SOCKET_STOP_PRE_SIGKILL ||
1334             s->state == SOCKET_STOP_PRE_SIGTERM ||
1335             s->state == SOCKET_STOP_POST ||
1336             s->state == SOCKET_FINAL_SIGTERM ||
1337             s->state == SOCKET_FINAL_SIGKILL)
1338                 return -EAGAIN;
1339
1340         if (s->state == SOCKET_START_PRE ||
1341             s->state == SOCKET_START_POST)
1342                 return 0;
1343
1344         /* Cannot run this without the service being around */
1345         if (s->service) {
1346                 if (s->service->meta.load_state != UNIT_LOADED)
1347                         return -ENOENT;
1348
1349                 /* If the service is alredy actvie we cannot start the
1350                  * socket */
1351                 if (s->service->state != SERVICE_DEAD &&
1352                     s->service->state != SERVICE_FAILED &&
1353                     s->service->state != SERVICE_AUTO_RESTART)
1354                         return -EBUSY;
1355         }
1356
1357         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1358
1359         s->failure = false;
1360         socket_enter_start_pre(s);
1361         return 0;
1362 }
1363
1364 static int socket_stop(Unit *u) {
1365         Socket *s = SOCKET(u);
1366
1367         assert(s);
1368
1369         /* Already on it */
1370         if (s->state == SOCKET_STOP_PRE ||
1371             s->state == SOCKET_STOP_PRE_SIGTERM ||
1372             s->state == SOCKET_STOP_PRE_SIGKILL ||
1373             s->state == SOCKET_STOP_POST ||
1374             s->state == SOCKET_FINAL_SIGTERM ||
1375             s->state == SOCKET_FINAL_SIGKILL)
1376                 return 0;
1377
1378         /* If there's already something running we go directly into
1379          * kill mode. */
1380         if (s->state == SOCKET_START_PRE ||
1381             s->state == SOCKET_START_POST) {
1382                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1383                 return -EAGAIN;
1384         }
1385
1386         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1387
1388         socket_enter_stop_pre(s, true);
1389         return 0;
1390 }
1391
1392 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1393         Socket *s = SOCKET(u);
1394         SocketPort *p;
1395         int r;
1396
1397         assert(u);
1398         assert(f);
1399         assert(fds);
1400
1401         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1402         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1403         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1404
1405         if (s->control_pid > 0)
1406                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1407
1408         if (s->control_command_id >= 0)
1409                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1410
1411         LIST_FOREACH(port, p, s->ports) {
1412                 int copy;
1413
1414                 if (p->fd < 0)
1415                         continue;
1416
1417                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1418                         return copy;
1419
1420                 if (p->type == SOCKET_SOCKET) {
1421                         char *t;
1422
1423                         if ((r = socket_address_print(&p->address, &t)) < 0)
1424                                 return r;
1425
1426                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1427                         free(t);
1428                 } else {
1429                         assert(p->type == SOCKET_FIFO);
1430                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1431                 }
1432         }
1433
1434         return 0;
1435 }
1436
1437 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1438         Socket *s = SOCKET(u);
1439
1440         assert(u);
1441         assert(key);
1442         assert(value);
1443         assert(fds);
1444
1445         if (streq(key, "state")) {
1446                 SocketState state;
1447
1448                 if ((state = socket_state_from_string(value)) < 0)
1449                         log_debug("Failed to parse state value %s", value);
1450                 else
1451                         s->deserialized_state = state;
1452         } else if (streq(key, "failure")) {
1453                 int b;
1454
1455                 if ((b = parse_boolean(value)) < 0)
1456                         log_debug("Failed to parse failure value %s", value);
1457                 else
1458                         s->failure = b || s->failure;
1459
1460         } else if (streq(key, "n-accepted")) {
1461                 unsigned k;
1462
1463                 if (safe_atou(value, &k) < 0)
1464                         log_debug("Failed to parse n-accepted value %s", value);
1465                 else
1466                         s->n_accepted += k;
1467         } else if (streq(key, "control-pid")) {
1468                 pid_t pid;
1469
1470                 if (parse_pid(value, &pid) < 0)
1471                         log_debug("Failed to parse control-pid value %s", value);
1472                 else
1473                         s->control_pid = pid;
1474         } else if (streq(key, "control-command")) {
1475                 SocketExecCommand id;
1476
1477                 if ((id = socket_exec_command_from_string(value)) < 0)
1478                         log_debug("Failed to parse exec-command value %s", value);
1479                 else {
1480                         s->control_command_id = id;
1481                         s->control_command = s->exec_command[id];
1482                 }
1483         } else if (streq(key, "fifo")) {
1484                 int fd, skip = 0;
1485                 SocketPort *p;
1486
1487                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1488                         log_debug("Failed to parse fifo value %s", value);
1489                 else {
1490
1491                         LIST_FOREACH(port, p, s->ports)
1492                                 if (streq(p->path, value+skip))
1493                                         break;
1494
1495                         if (p) {
1496                                 if (p->fd >= 0)
1497                                         close_nointr_nofail(p->fd);
1498                                 p->fd = fdset_remove(fds, fd);
1499                         }
1500                 }
1501
1502         } else if (streq(key, "socket")) {
1503                 int fd, type, skip = 0;
1504                 SocketPort *p;
1505
1506                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1507                         log_debug("Failed to parse socket value %s", value);
1508                 else {
1509
1510                         LIST_FOREACH(port, p, s->ports)
1511                                 if (socket_address_is(&p->address, value+skip, type))
1512                                         break;
1513
1514                         if (p) {
1515                                 if (p->fd >= 0)
1516                                         close_nointr_nofail(p->fd);
1517                                 p->fd = fdset_remove(fds, fd);
1518                         }
1519                 }
1520
1521         } else
1522                 log_debug("Unknown serialization key '%s'", key);
1523
1524         return 0;
1525 }
1526
1527 static UnitActiveState socket_active_state(Unit *u) {
1528         assert(u);
1529
1530         return state_translation_table[SOCKET(u)->state];
1531 }
1532
1533 static const char *socket_sub_state_to_string(Unit *u) {
1534         assert(u);
1535
1536         return socket_state_to_string(SOCKET(u)->state);
1537 }
1538
1539 static bool socket_check_gc(Unit *u) {
1540         Socket *s = SOCKET(u);
1541
1542         assert(u);
1543
1544         return s->n_connections > 0;
1545 }
1546
1547 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1548         Socket *s = SOCKET(u);
1549         int cfd = -1;
1550
1551         assert(s);
1552         assert(fd >= 0);
1553
1554         if (s->state != SOCKET_LISTENING)
1555                 return;
1556
1557         log_debug("Incoming traffic on %s", u->meta.id);
1558
1559         if (events != EPOLLIN) {
1560                 log_error("Got invalid poll event on socket.");
1561                 goto fail;
1562         }
1563
1564         if (w->socket_accept) {
1565                 for (;;) {
1566
1567                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1568
1569                                 if (errno == EINTR)
1570                                         continue;
1571
1572                                 log_error("Failed to accept socket: %m");
1573                                 goto fail;
1574                         }
1575
1576                         break;
1577                 }
1578
1579                 socket_apply_socket_options(s, cfd);
1580         }
1581
1582         socket_enter_running(s, cfd);
1583         return;
1584
1585 fail:
1586         socket_enter_stop_pre(s, false);
1587 }
1588
1589 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1590         Socket *s = SOCKET(u);
1591         bool success;
1592
1593         assert(s);
1594         assert(pid >= 0);
1595
1596         if (pid != s->control_pid)
1597                 return;
1598
1599         s->control_pid = 0;
1600
1601         success = is_clean_exit(code, status);
1602
1603         if (s->control_command) {
1604                 exec_status_exit(&s->control_command->exec_status, pid, code, status);
1605
1606                 if (s->control_command->ignore)
1607                         success = true;
1608         }
1609
1610         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1611                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1612         s->failure = s->failure || !success;
1613
1614         if (s->control_command && s->control_command->command_next && success) {
1615                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1616                 socket_run_next(s, success);
1617         } else {
1618                 s->control_command = NULL;
1619                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1620
1621                 /* No further commands for this step, so let's figure
1622                  * out what to do next */
1623
1624                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1625
1626                 switch (s->state) {
1627
1628                 case SOCKET_START_PRE:
1629                         if (success)
1630                                 socket_enter_start_post(s);
1631                         else
1632                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1633                         break;
1634
1635                 case SOCKET_START_POST:
1636                         if (success)
1637                                 socket_enter_listening(s);
1638                         else
1639                                 socket_enter_stop_pre(s, false);
1640                         break;
1641
1642                 case SOCKET_STOP_PRE:
1643                 case SOCKET_STOP_PRE_SIGTERM:
1644                 case SOCKET_STOP_PRE_SIGKILL:
1645                         socket_enter_stop_post(s, success);
1646                         break;
1647
1648                 case SOCKET_STOP_POST:
1649                 case SOCKET_FINAL_SIGTERM:
1650                 case SOCKET_FINAL_SIGKILL:
1651                         socket_enter_dead(s, success);
1652                         break;
1653
1654                 default:
1655                         assert_not_reached("Uh, control process died at wrong time.");
1656                 }
1657         }
1658
1659         /* Notify clients about changed exit status */
1660         unit_add_to_dbus_queue(u);
1661 }
1662
1663 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1664         Socket *s = SOCKET(u);
1665
1666         assert(s);
1667         assert(elapsed == 1);
1668         assert(w == &s->timer_watch);
1669
1670         switch (s->state) {
1671
1672         case SOCKET_START_PRE:
1673                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1674                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1675
1676         case SOCKET_START_POST:
1677                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1678                 socket_enter_stop_pre(s, false);
1679                 break;
1680
1681         case SOCKET_STOP_PRE:
1682                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1683                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1684                 break;
1685
1686         case SOCKET_STOP_PRE_SIGTERM:
1687                 log_warning("%s stopping timed out. Killing.", u->meta.id);
1688                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1689                 break;
1690
1691         case SOCKET_STOP_PRE_SIGKILL:
1692                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1693                 socket_enter_stop_post(s, false);
1694                 break;
1695
1696         case SOCKET_STOP_POST:
1697                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1698                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1699                 break;
1700
1701         case SOCKET_FINAL_SIGTERM:
1702                 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1703                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1704                 break;
1705
1706         case SOCKET_FINAL_SIGKILL:
1707                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
1708                 socket_enter_dead(s, false);
1709                 break;
1710
1711         default:
1712                 assert_not_reached("Timeout at wrong time.");
1713         }
1714 }
1715
1716 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1717         int *rfds;
1718         unsigned rn_fds, k;
1719         SocketPort *p;
1720
1721         assert(s);
1722         assert(fds);
1723         assert(n_fds);
1724
1725         /* Called from the service code for requesting our fds */
1726
1727         rn_fds = 0;
1728         LIST_FOREACH(port, p, s->ports)
1729                 if (p->fd >= 0)
1730                         rn_fds++;
1731
1732         if (!(rfds = new(int, rn_fds)))
1733                 return -ENOMEM;
1734
1735         k = 0;
1736         LIST_FOREACH(port, p, s->ports)
1737                 if (p->fd >= 0)
1738                         rfds[k++] = p->fd;
1739
1740         assert(k == rn_fds);
1741
1742         *fds = rfds;
1743         *n_fds = rn_fds;
1744
1745         return 0;
1746 }
1747
1748 void socket_notify_service_dead(Socket *s) {
1749         assert(s);
1750
1751         /* The service is dead. Dang!
1752          *
1753          * This is strictly for one-instance-for-all-connections
1754          * services. */
1755
1756         if (s->state == SOCKET_RUNNING) {
1757                 log_debug("%s got notified about service death.", s->meta.id);
1758                 socket_enter_listening(s);
1759         }
1760 }
1761
1762 void socket_connection_unref(Socket *s) {
1763         assert(s);
1764
1765         /* The service is dead. Yay!
1766          *
1767          * This is strictly for one-onstance-per-connection
1768          * services. */
1769
1770         assert(s->n_connections > 0);
1771         s->n_connections--;
1772
1773         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1774 }
1775
1776 static void socket_reset_failed(Unit *u) {
1777         Socket *s = SOCKET(u);
1778
1779         assert(s);
1780
1781         if (s->state == SOCKET_FAILED)
1782                 socket_set_state(s, SOCKET_DEAD);
1783
1784         s->failure = false;
1785 }
1786
1787 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1788         [SOCKET_DEAD] = "dead",
1789         [SOCKET_START_PRE] = "start-pre",
1790         [SOCKET_START_POST] = "start-post",
1791         [SOCKET_LISTENING] = "listening",
1792         [SOCKET_RUNNING] = "running",
1793         [SOCKET_STOP_PRE] = "stop-pre",
1794         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1795         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1796         [SOCKET_STOP_POST] = "stop-post",
1797         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1798         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1799         [SOCKET_FAILED] = "failed"
1800 };
1801
1802 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1803
1804 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1805         [SOCKET_EXEC_START_PRE] = "StartPre",
1806         [SOCKET_EXEC_START_POST] = "StartPost",
1807         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1808         [SOCKET_EXEC_STOP_POST] = "StopPost"
1809 };
1810
1811 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1812
1813 const UnitVTable socket_vtable = {
1814         .suffix = ".socket",
1815
1816         .init = socket_init,
1817         .done = socket_done,
1818         .load = socket_load,
1819
1820         .coldplug = socket_coldplug,
1821
1822         .dump = socket_dump,
1823
1824         .start = socket_start,
1825         .stop = socket_stop,
1826
1827         .serialize = socket_serialize,
1828         .deserialize_item = socket_deserialize_item,
1829
1830         .active_state = socket_active_state,
1831         .sub_state_to_string = socket_sub_state_to_string,
1832
1833         .check_gc = socket_check_gc,
1834
1835         .fd_event = socket_fd_event,
1836         .sigchld_event = socket_sigchld_event,
1837         .timer_event = socket_timer_event,
1838
1839         .reset_failed = socket_reset_failed,
1840
1841         .bus_interface = "org.freedesktop.systemd1.Socket",
1842         .bus_message_handler = bus_socket_message_handler,
1843         .bus_invalidating_properties =  bus_socket_invalidating_properties
1844 };