src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29 #include <arpa/inet.h>
  30 #include <mqueue.h>
  31
  32 #include "unit.h"
  33 #include "socket.h"
  34 #include "netinet/tcp.h"
  35 #include "log.h"
  36 #include "load-dropin.h"
  37 #include "load-fragment.h"
  38 #include "strv.h"
  39 #include "unit-name.h"
  40 #include "dbus-socket.h"
  41 #include "missing.h"
  42 #include "special.h"
  43 #include "bus-errors.h"
  44 #include "label.h"
  45 #include "exit-status.h"
  46 #include "def.h"
  47
  48 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  49         [SOCKET_DEAD] = UNIT_INACTIVE,
  50         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  51         [SOCKET_START_POST] = UNIT_ACTIVATING,
  52         [SOCKET_LISTENING] = UNIT_ACTIVE,
  53         [SOCKET_RUNNING] = UNIT_ACTIVE,
  54         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  55         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  56         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  57         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  58         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  59         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  60         [SOCKET_FAILED] = UNIT_FAILED
  61 };
  62
  63 static void socket_init(Unit *u) {
  64         Socket *s = SOCKET(u);
  65
  66         assert(u);
  67         assert(u->meta.load_state == UNIT_STUB);
  68
  69         s->backlog = SOMAXCONN;
  70         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  71         s->directory_mode = 0755;
  72         s->socket_mode = 0666;
  73
  74         s->max_connections = 64;
  75
  76         s->priority = -1;
  77         s->ip_tos = -1;
  78         s->ip_ttl = -1;
  79         s->mark = -1;
  80
  81         exec_context_init(&s->exec_context);
  82         s->exec_context.std_output = u->meta.manager->default_std_output;
  83         s->exec_context.std_error = u->meta.manager->default_std_error;
  84
  85         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  86 }
  87
  88 static void socket_unwatch_control_pid(Socket *s) {
  89         assert(s);
  90
  91         if (s->control_pid <= 0)
  92                 return;
  93
  94         unit_unwatch_pid(UNIT(s), s->control_pid);
  95         s->control_pid = 0;
  96 }
  97
  98 static void socket_done(Unit *u) {
  99         Socket *s = SOCKET(u);
 100         SocketPort *p;
 101         Meta *i;
 102
 103         assert(s);
 104
 105         while ((p = s->ports)) {
 106                 LIST_REMOVE(SocketPort, port, s->ports, p);
 107
 108                 if (p->fd >= 0) {
 109                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 110                         close_nointr_nofail(p->fd);
 111                 }
 112
 113                 free(p->path);
 114                 free(p);
 115         }
 116
 117         exec_context_done(&s->exec_context);
 118         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 119         s->control_command = NULL;
 120
 121         socket_unwatch_control_pid(s);
 122
 123         s->service = NULL;
 124
 125         free(s->tcp_congestion);
 126         s->tcp_congestion = NULL;
 127
 128         free(s->bind_to_device);
 129         s->bind_to_device = NULL;
 130
 131         unit_unwatch_timer(u, &s->timer_watch);
 132
 133         /* Make sure no service instance refers to us anymore. */
 134         LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
 135                 Service *service = (Service *) i;
 136
 137                 if (service->accept_socket == s)
 138                         service->accept_socket = NULL;
 139
 140                 set_remove(service->configured_sockets, s);
 141         }
 142 }
 143
 144 static int socket_instantiate_service(Socket *s) {
 145         char *prefix, *name;
 146         int r;
 147         Unit *u;
 148
 149         assert(s);
 150
 151         /* This fills in s->service if it isn't filled in yet. For
 152          * Accept=yes sockets we create the next connection service
 153          * here. For Accept=no this is mostly a NOP since the service
 154          * is figured out at load time anyway. */
 155
 156         if (s->service)
 157                 return 0;
 158
 159         assert(s->accept);
 160
 161         if (!(prefix = unit_name_to_prefix(s->meta.id)))
 162                 return -ENOMEM;
 163
 164         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 165         free(prefix);
 166
 167         if (r < 0)
 168                 return -ENOMEM;
 169
 170         r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
 171         free(name);
 172
 173         if (r < 0)
 174                 return r;
 175
 176 #ifdef HAVE_SYSV_COMPAT
 177         if (SERVICE(u)->sysv_path) {
 178                 log_error("Using SysV services for socket activation is not supported. Refusing.");
 179                 return -ENOENT;
 180         }
 181 #endif
 182
 183         u->meta.no_gc = true;
 184         s->service = SERVICE(u);
 185         return 0;
 186 }
 187
 188 static bool have_non_accept_socket(Socket *s) {
 189         SocketPort *p;
 190
 191         assert(s);
 192
 193         if (!s->accept)
 194                 return true;
 195
 196         LIST_FOREACH(port, p, s->ports) {
 197
 198                 if (p->type != SOCKET_SOCKET)
 199                         return true;
 200
 201                 if (!socket_address_can_accept(&p->address))
 202                         return true;
 203         }
 204
 205         return false;
 206 }
 207
 208 static int socket_verify(Socket *s) {
 209         assert(s);
 210
 211         if (s->meta.load_state != UNIT_LOADED)
 212                 return 0;
 213
 214         if (!s->ports) {
 215                 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
 216                 return -EINVAL;
 217         }
 218
 219         if (s->accept && have_non_accept_socket(s)) {
 220                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
 221                 return -EINVAL;
 222         }
 223
 224         if (s->accept && s->max_connections <= 0) {
 225                 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
 226                 return -EINVAL;
 227         }
 228
 229         if (s->accept && s->service) {
 230                 log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", s->meta.id);
 231                 return -EINVAL;
 232         }
 233
 234         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 235                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
 236                 return -EINVAL;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static bool socket_needs_mount(Socket *s, const char *prefix) {
 243         SocketPort *p;
 244
 245         assert(s);
 246
 247         LIST_FOREACH(port, p, s->ports) {
 248
 249                 if (p->type == SOCKET_SOCKET) {
 250                         if (socket_address_needs_mount(&p->address, prefix))
 251                                 return true;
 252                 } else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL) {
 253                         if (path_startswith(p->path, prefix))
 254                                 return true;
 255                 }
 256         }
 257
 258         return false;
 259 }
 260
 261 int socket_add_one_mount_link(Socket *s, Mount *m) {
 262         int r;
 263
 264         assert(s);
 265         assert(m);
 266
 267         if (s->meta.load_state != UNIT_LOADED ||
 268             m->meta.load_state != UNIT_LOADED)
 269                 return 0;
 270
 271         if (!socket_needs_mount(s, m->where))
 272                 return 0;
 273
 274         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 275                 return r;
 276
 277         return 0;
 278 }
 279
 280 static int socket_add_mount_links(Socket *s) {
 281         Meta *other;
 282         int r;
 283
 284         assert(s);
 285
 286         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 287                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 288                         return r;
 289
 290         return 0;
 291 }
 292
 293 static int socket_add_device_link(Socket *s) {
 294         char *t;
 295         int r;
 296
 297         assert(s);
 298
 299         if (!s->bind_to_device)
 300                 return 0;
 301
 302         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 303                 return -ENOMEM;
 304
 305         r = unit_add_node_link(UNIT(s), t, false);
 306         free(t);
 307
 308         return r;
 309 }
 310
 311 static int socket_add_default_dependencies(Socket *s) {
 312         int r;
 313         assert(s);
 314
 315         if (s->meta.manager->running_as == MANAGER_SYSTEM) {
 316                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
 317                         return r;
 318
 319                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 320                         return r;
 321         }
 322
 323         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 324 }
 325
 326 static int socket_load(Unit *u) {
 327         Socket *s = SOCKET(u);
 328         int r;
 329
 330         assert(u);
 331         assert(u->meta.load_state == UNIT_STUB);
 332
 333         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 334                 return r;
 335
 336         /* This is a new unit? Then let's add in some extras */
 337         if (u->meta.load_state == UNIT_LOADED) {
 338
 339                 if (have_non_accept_socket(s)) {
 340
 341                         if (!s->service)
 342                                 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
 343                                         return r;
 344
 345                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 346                                 return r;
 347                 }
 348
 349                 if ((r = socket_add_mount_links(s)) < 0)
 350                         return r;
 351
 352                 if ((r = socket_add_device_link(s)) < 0)
 353                         return r;
 354
 355                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 356                         return r;
 357
 358                 if ((r = unit_add_default_cgroups(u)) < 0)
 359                         return r;
 360
 361                 if (s->meta.default_dependencies)
 362                         if ((r = socket_add_default_dependencies(s)) < 0)
 363                                 return r;
 364         }
 365
 366         return socket_verify(s);
 367 }
 368
 369 static const char* listen_lookup(int family, int type) {
 370
 371         if (family == AF_NETLINK)
 372                 return "ListenNetlink";
 373
 374         if (type == SOCK_STREAM)
 375                 return "ListenStream";
 376         else if (type == SOCK_DGRAM)
 377                 return "ListenDatagram";
 378         else if (type == SOCK_SEQPACKET)
 379                 return "ListenSequentialPacket";
 380
 381         assert_not_reached("Unknown socket type");
 382         return NULL;
 383 }
 384
 385 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 386
 387         SocketExecCommand c;
 388         Socket *s = SOCKET(u);
 389         SocketPort *p;
 390         const char *prefix2;
 391         char *p2;
 392
 393         assert(s);
 394         assert(f);
 395
 396         p2 = strappend(prefix, "\t");
 397         prefix2 = p2 ? p2 : prefix;
 398
 399         fprintf(f,
 400                 "%sSocket State: %s\n"
 401                 "%sBindIPv6Only: %s\n"
 402                 "%sBacklog: %u\n"
 403                 "%sSocketMode: %04o\n"
 404                 "%sDirectoryMode: %04o\n"
 405                 "%sKeepAlive: %s\n"
 406                 "%sFreeBind: %s\n"
 407                 "%sTransparent: %s\n"
 408                 "%sTCPCongestion: %s\n",
 409                 prefix, socket_state_to_string(s->state),
 410                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 411                 prefix, s->backlog,
 412                 prefix, s->socket_mode,
 413                 prefix, s->directory_mode,
 414                 prefix, yes_no(s->keep_alive),
 415                 prefix, yes_no(s->free_bind),
 416                 prefix, yes_no(s->transparent),
 417                 prefix, strna(s->tcp_congestion));
 418
 419         if (s->control_pid > 0)
 420                 fprintf(f,
 421                         "%sControl PID: %lu\n",
 422                         prefix, (unsigned long) s->control_pid);
 423
 424         if (s->bind_to_device)
 425                 fprintf(f,
 426                         "%sBindToDevice: %s\n",
 427                         prefix, s->bind_to_device);
 428
 429         if (s->accept)
 430                 fprintf(f,
 431                         "%sAccepted: %u\n"
 432                         "%sNConnections: %u\n"
 433                         "%sMaxConnections: %u\n",
 434                         prefix, s->n_accepted,
 435                         prefix, s->n_connections,
 436                         prefix, s->max_connections);
 437
 438         if (s->priority >= 0)
 439                 fprintf(f,
 440                         "%sPriority: %i\n",
 441                         prefix, s->priority);
 442
 443         if (s->receive_buffer > 0)
 444                 fprintf(f,
 445                         "%sReceiveBuffer: %zu\n",
 446                         prefix, s->receive_buffer);
 447
 448         if (s->send_buffer > 0)
 449                 fprintf(f,
 450                         "%sSendBuffer: %zu\n",
 451                         prefix, s->send_buffer);
 452
 453         if (s->ip_tos >= 0)
 454                 fprintf(f,
 455                         "%sIPTOS: %i\n",
 456                         prefix, s->ip_tos);
 457
 458         if (s->ip_ttl >= 0)
 459                 fprintf(f,
 460                         "%sIPTTL: %i\n",
 461                         prefix, s->ip_ttl);
 462
 463         if (s->pipe_size > 0)
 464                 fprintf(f,
 465                         "%sPipeSize: %zu\n",
 466                         prefix, s->pipe_size);
 467
 468         if (s->mark >= 0)
 469                 fprintf(f,
 470                         "%sMark: %i\n",
 471                         prefix, s->mark);
 472
 473         if (s->mq_maxmsg > 0)
 474                 fprintf(f,
 475                         "%sMessageQueueMaxMessages: %li\n",
 476                         prefix, s->mq_maxmsg);
 477
 478         if (s->mq_msgsize > 0)
 479                 fprintf(f,
 480                         "%sMessageQueueMessageSize: %li\n",
 481                         prefix, s->mq_msgsize);
 482
 483         LIST_FOREACH(port, p, s->ports) {
 484
 485                 if (p->type == SOCKET_SOCKET) {
 486                         const char *t;
 487                         int r;
 488                         char *k = NULL;
 489
 490                         if ((r = socket_address_print(&p->address, &k)) < 0)
 491                                 t = strerror(-r);
 492                         else
 493                                 t = k;
 494
 495                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
 496                         free(k);
 497                 } else if (p->type == SOCKET_SPECIAL)
 498                         fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
 499                 else if (p->type == SOCKET_MQUEUE)
 500                         fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
 501                 else
 502                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 503         }
 504
 505         exec_context_dump(&s->exec_context, f, prefix);
 506
 507         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 508                 if (!s->exec_command[c])
 509                         continue;
 510
 511                 fprintf(f, "%s-> %s:\n",
 512                         prefix, socket_exec_command_to_string(c));
 513
 514                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 515         }
 516
 517         free(p2);
 518 }
 519
 520 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 521         socklen_t l;
 522         char *r;
 523         union {
 524                 struct sockaddr sa;
 525                 struct sockaddr_un un;
 526                 struct sockaddr_in in;
 527                 struct sockaddr_in6 in6;
 528                 struct sockaddr_storage storage;
 529         } local, remote;
 530
 531         assert(fd >= 0);
 532         assert(instance);
 533
 534         l = sizeof(local);
 535         if (getsockname(fd, &local.sa, &l) < 0)
 536                 return -errno;
 537
 538         l = sizeof(remote);
 539         if (getpeername(fd, &remote.sa, &l) < 0)
 540                 return -errno;
 541
 542         switch (local.sa.sa_family) {
 543
 544         case AF_INET: {
 545                 uint32_t
 546                         a = ntohl(local.in.sin_addr.s_addr),
 547                         b = ntohl(remote.in.sin_addr.s_addr);
 548
 549                 if (asprintf(&r,
 550                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 551                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 552                              ntohs(local.in.sin_port),
 553                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 554                              ntohs(remote.in.sin_port)) < 0)
 555                         return -ENOMEM;
 556
 557                 break;
 558         }
 559
 560         case AF_INET6: {
 561                 static const char ipv4_prefix[] = {
 562                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 563                 };
 564
 565                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 566                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 567                         const uint8_t
 568                                 *a = local.in6.sin6_addr.s6_addr+12,
 569                                 *b = remote.in6.sin6_addr.s6_addr+12;
 570
 571                         if (asprintf(&r,
 572                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 573                                      a[0], a[1], a[2], a[3],
 574                                      ntohs(local.in6.sin6_port),
 575                                      b[0], b[1], b[2], b[3],
 576                                      ntohs(remote.in6.sin6_port)) < 0)
 577                                 return -ENOMEM;
 578                 } else {
 579                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 580
 581                         if (asprintf(&r,
 582                                      "%s:%u-%s:%u",
 583                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 584                                      ntohs(local.in6.sin6_port),
 585                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 586                                      ntohs(remote.in6.sin6_port)) < 0)
 587                                 return -ENOMEM;
 588                 }
 589
 590                 break;
 591         }
 592
 593         case AF_UNIX: {
 594                 struct ucred ucred;
 595
 596                 l = sizeof(ucred);
 597                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 598                         return -errno;
 599
 600                 if (asprintf(&r,
 601                              "%u-%lu-%lu",
 602                              nr,
 603                              (unsigned long) ucred.pid,
 604                              (unsigned long) ucred.uid) < 0)
 605                         return -ENOMEM;
 606
 607                 break;
 608         }
 609
 610         default:
 611                 assert_not_reached("Unhandled socket type.");
 612         }
 613
 614         *instance = r;
 615         return 0;
 616 }
 617
 618 static void socket_close_fds(Socket *s) {
 619         SocketPort *p;
 620
 621         assert(s);
 622
 623         LIST_FOREACH(port, p, s->ports) {
 624                 if (p->fd < 0)
 625                         continue;
 626
 627                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 628                 close_nointr_nofail(p->fd);
 629
 630                 /* One little note: we should never delete any sockets
 631                  * in the file system here! After all some other
 632                  * process we spawned might still have a reference of
 633                  * this fd and wants to continue to use it. Therefore
 634                  * we delete sockets in the file system before we
 635                  * create a new one, not after we stopped using
 636                  * one! */
 637
 638                 p->fd = -1;
 639         }
 640 }
 641
 642 static void socket_apply_socket_options(Socket *s, int fd) {
 643         assert(s);
 644         assert(fd >= 0);
 645
 646         if (s->keep_alive) {
 647                 int b = s->keep_alive;
 648                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 649                         log_warning("SO_KEEPALIVE failed: %m");
 650         }
 651
 652         if (s->priority >= 0)
 653                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 654                         log_warning("SO_PRIORITY failed: %m");
 655
 656         if (s->receive_buffer > 0) {
 657                 int value = (int) s->receive_buffer;
 658                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 659                         log_warning("SO_RCVBUF failed: %m");
 660         }
 661
 662         if (s->send_buffer > 0) {
 663                 int value = (int) s->send_buffer;
 664                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 665                         log_warning("SO_SNDBUF failed: %m");
 666         }
 667
 668         if (s->mark >= 0)
 669                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 670                         log_warning("SO_MARK failed: %m");
 671
 672         if (s->ip_tos >= 0)
 673                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 674                         log_warning("IP_TOS failed: %m");
 675
 676         if (s->ip_ttl >= 0) {
 677                 int r, x;
 678
 679                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 680
 681                 if (socket_ipv6_is_supported())
 682                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 683                 else {
 684                         x = -1;
 685                         errno = EAFNOSUPPORT;
 686                 }
 687
 688                 if (r < 0 && x < 0)
 689                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 690         }
 691
 692         if (s->tcp_congestion)
 693                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 694                         log_warning("TCP_CONGESTION failed: %m");
 695 }
 696
 697 static void socket_apply_fifo_options(Socket *s, int fd) {
 698         assert(s);
 699         assert(fd >= 0);
 700
 701         if (s->pipe_size > 0)
 702                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 703                         log_warning("F_SETPIPE_SZ: %m");
 704 }
 705
 706 static int fifo_address_create(
 707                 const char *path,
 708                 mode_t directory_mode,
 709                 mode_t socket_mode,
 710                 int *_fd) {
 711
 712         int fd = -1, r = 0;
 713         struct stat st;
 714         mode_t old_mask;
 715
 716         assert(path);
 717         assert(_fd);
 718
 719         mkdir_parents(path, directory_mode);
 720
 721         if ((r = label_fifofile_set(path)) < 0)
 722                 goto fail;
 723
 724         /* Enforce the right access mode for the fifo */
 725         old_mask = umask(~ socket_mode);
 726
 727         /* Include the original umask in our mask */
 728         umask(~socket_mode | old_mask);
 729
 730         r = mkfifo(path, socket_mode);
 731         umask(old_mask);
 732
 733         if (r < 0 && errno != EEXIST) {
 734                 r = -errno;
 735                 goto fail;
 736         }
 737
 738         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 739                 r = -errno;
 740                 goto fail;
 741         }
 742
 743         label_file_clear();
 744
 745         if (fstat(fd, &st) < 0) {
 746                 r = -errno;
 747                 goto fail;
 748         }
 749
 750         if (!S_ISFIFO(st.st_mode) ||
 751             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 752             st.st_uid != getuid() ||
 753             st.st_gid != getgid()) {
 754
 755                 r = -EEXIST;
 756                 goto fail;
 757         }
 758
 759         *_fd = fd;
 760         return 0;
 761
 762 fail:
 763         label_file_clear();
 764
 765         if (fd >= 0)
 766                 close_nointr_nofail(fd);
 767
 768         return r;
 769 }
 770
 771 static int special_address_create(
 772                 const char *path,
 773                 int *_fd) {
 774
 775         int fd = -1, r = 0;
 776         struct stat st;
 777
 778         assert(path);
 779         assert(_fd);
 780
 781         if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 782                 r = -errno;
 783                 goto fail;
 784         }
 785
 786         if (fstat(fd, &st) < 0) {
 787                 r = -errno;
 788                 goto fail;
 789         }
 790
 791         /* Check whether this is a /proc, /sys or /dev file or char device */
 792         if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
 793                 r = -EEXIST;
 794                 goto fail;
 795         }
 796
 797         *_fd = fd;
 798         return 0;
 799
 800 fail:
 801         if (fd >= 0)
 802                 close_nointr_nofail(fd);
 803
 804         return r;
 805 }
 806
 807 static int mq_address_create(
 808                 const char *path,
 809                 mode_t mq_mode,
 810                 long maxmsg,
 811                 long msgsize,
 812                 int *_fd) {
 813
 814         int fd = -1, r = 0;
 815         struct stat st;
 816         mode_t old_mask;
 817         struct mq_attr _attr, *attr = NULL;
 818
 819         assert(path);
 820         assert(_fd);
 821
 822         if (maxmsg > 0 && msgsize > 0) {
 823                 zero(_attr);
 824                 _attr.mq_flags = O_NONBLOCK;
 825                 _attr.mq_maxmsg = maxmsg;
 826                 _attr.mq_msgsize = msgsize;
 827                 attr = &_attr;
 828         }
 829
 830         /* Enforce the right access mode for the mq */
 831         old_mask = umask(~ mq_mode);
 832
 833         /* Include the original umask in our mask */
 834         umask(~mq_mode | old_mask);
 835
 836         fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
 837         umask(old_mask);
 838
 839         if (fd < 0 && errno != EEXIST) {
 840                 r = -errno;
 841                 goto fail;
 842         }
 843
 844         if (fstat(fd, &st) < 0) {
 845                 r = -errno;
 846                 goto fail;
 847         }
 848
 849         if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
 850             st.st_uid != getuid() ||
 851             st.st_gid != getgid()) {
 852
 853                 r = -EEXIST;
 854                 goto fail;
 855         }
 856
 857         *_fd = fd;
 858         return 0;
 859
 860 fail:
 861         if (fd >= 0)
 862                 close_nointr_nofail(fd);
 863
 864         return r;
 865 }
 866
 867 static int socket_open_fds(Socket *s) {
 868         SocketPort *p;
 869         int r;
 870         char *label = NULL;
 871         bool know_label = false;
 872
 873         assert(s);
 874
 875         LIST_FOREACH(port, p, s->ports) {
 876
 877                 if (p->fd >= 0)
 878                         continue;
 879
 880                 if (p->type == SOCKET_SOCKET) {
 881
 882                         if (!know_label) {
 883
 884                                 if ((r = socket_instantiate_service(s)) < 0)
 885                                         return r;
 886
 887                                 if (s->service && s->service->exec_command[SERVICE_EXEC_START])
 888                                         if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0) {
 889                                                 if (r != -EPERM)
 890                                                         return r;
 891                                         }
 892
 893                                 know_label = true;
 894                         }
 895
 896                         if ((r = socket_address_listen(
 897                                              &p->address,
 898                                              s->backlog,
 899                                              s->bind_ipv6_only,
 900                                              s->bind_to_device,
 901                                              s->free_bind,
 902                                              s->transparent,
 903                                              s->directory_mode,
 904                                              s->socket_mode,
 905                                              label,
 906                                              &p->fd)) < 0)
 907                                 goto rollback;
 908
 909                         socket_apply_socket_options(s, p->fd);
 910
 911                 } else  if (p->type == SOCKET_SPECIAL) {
 912
 913                         if ((r = special_address_create(
 914                                              p->path,
 915                                              &p->fd)) < 0)
 916                                 goto rollback;
 917
 918                 } else  if (p->type == SOCKET_FIFO) {
 919
 920                         if ((r = fifo_address_create(
 921                                              p->path,
 922                                              s->directory_mode,
 923                                              s->socket_mode,
 924                                              &p->fd)) < 0)
 925                                 goto rollback;
 926
 927                         socket_apply_fifo_options(s, p->fd);
 928                 } else if (p->type == SOCKET_MQUEUE) {
 929
 930                         if ((r = mq_address_create(
 931                                              p->path,
 932                                              s->socket_mode,
 933                                              s->mq_maxmsg,
 934                                              s->mq_msgsize,
 935                                              &p->fd)) < 0)
 936                                 goto rollback;
 937                 } else
 938                         assert_not_reached("Unknown port type");
 939         }
 940
 941         label_free(label);
 942         return 0;
 943
 944 rollback:
 945         socket_close_fds(s);
 946         label_free(label);
 947         return r;
 948 }
 949
 950 static void socket_unwatch_fds(Socket *s) {
 951         SocketPort *p;
 952
 953         assert(s);
 954
 955         LIST_FOREACH(port, p, s->ports) {
 956                 if (p->fd < 0)
 957                         continue;
 958
 959                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 960         }
 961 }
 962
 963 static int socket_watch_fds(Socket *s) {
 964         SocketPort *p;
 965         int r;
 966
 967         assert(s);
 968
 969         LIST_FOREACH(port, p, s->ports) {
 970                 if (p->fd < 0)
 971                         continue;
 972
 973                 p->fd_watch.socket_accept =
 974                         s->accept &&
 975                         p->type == SOCKET_SOCKET &&
 976                         socket_address_can_accept(&p->address);
 977
 978                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 979                         goto fail;
 980         }
 981
 982         return 0;
 983
 984 fail:
 985         socket_unwatch_fds(s);
 986         return r;
 987 }
 988
 989 static void socket_set_state(Socket *s, SocketState state) {
 990         SocketState old_state;
 991         assert(s);
 992
 993         old_state = s->state;
 994         s->state = state;
 995
 996         if (state != SOCKET_START_PRE &&
 997             state != SOCKET_START_POST &&
 998             state != SOCKET_STOP_PRE &&
 999             state != SOCKET_STOP_PRE_SIGTERM &&
1000             state != SOCKET_STOP_PRE_SIGKILL &&
1001             state != SOCKET_STOP_POST &&
1002             state != SOCKET_FINAL_SIGTERM &&
1003             state != SOCKET_FINAL_SIGKILL) {
1004                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1005                 socket_unwatch_control_pid(s);
1006                 s->control_command = NULL;
1007                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1008         }
1009
1010         if (state != SOCKET_LISTENING)
1011                 socket_unwatch_fds(s);
1012
1013         if (state != SOCKET_START_POST &&
1014             state != SOCKET_LISTENING &&
1015             state != SOCKET_RUNNING &&
1016             state != SOCKET_STOP_PRE &&
1017             state != SOCKET_STOP_PRE_SIGTERM &&
1018             state != SOCKET_STOP_PRE_SIGKILL)
1019                 socket_close_fds(s);
1020
1021         if (state != old_state)
1022                 log_debug("%s changed %s -> %s",
1023                           s->meta.id,
1024                           socket_state_to_string(old_state),
1025                           socket_state_to_string(state));
1026
1027         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1028 }
1029
1030 static int socket_coldplug(Unit *u) {
1031         Socket *s = SOCKET(u);
1032         int r;
1033
1034         assert(s);
1035         assert(s->state == SOCKET_DEAD);
1036
1037         if (s->deserialized_state != s->state) {
1038
1039                 if (s->deserialized_state == SOCKET_START_PRE ||
1040                     s->deserialized_state == SOCKET_START_POST ||
1041                     s->deserialized_state == SOCKET_STOP_PRE ||
1042                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1043                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
1044                     s->deserialized_state == SOCKET_STOP_POST ||
1045                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
1046                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
1047
1048                         if (s->control_pid <= 0)
1049                                 return -EBADMSG;
1050
1051                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
1052                                 return r;
1053
1054                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1055                                 return r;
1056                 }
1057
1058                 if (s->deserialized_state == SOCKET_START_POST ||
1059                     s->deserialized_state == SOCKET_LISTENING ||
1060                     s->deserialized_state == SOCKET_RUNNING ||
1061                     s->deserialized_state == SOCKET_STOP_PRE ||
1062                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1063                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
1064                         if ((r = socket_open_fds(s)) < 0)
1065                                 return r;
1066
1067                 if (s->deserialized_state == SOCKET_LISTENING)
1068                         if ((r = socket_watch_fds(s)) < 0)
1069                                 return r;
1070
1071                 socket_set_state(s, s->deserialized_state);
1072         }
1073
1074         return 0;
1075 }
1076
1077 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1078         pid_t pid;
1079         int r;
1080         char **argv;
1081
1082         assert(s);
1083         assert(c);
1084         assert(_pid);
1085
1086         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1087                 goto fail;
1088
1089         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
1090                 r = -ENOMEM;
1091                 goto fail;
1092         }
1093
1094         r = exec_spawn(c,
1095                        argv,
1096                        &s->exec_context,
1097                        NULL, 0,
1098                        s->meta.manager->environment,
1099                        true,
1100                        true,
1101                        true,
1102                        s->meta.manager->confirm_spawn,
1103                        s->meta.cgroup_bondings,
1104                        &pid);
1105
1106         strv_free(argv);
1107         if (r < 0)
1108                 goto fail;
1109
1110         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
1111                 /* FIXME: we need to do something here */
1112                 goto fail;
1113
1114         *_pid = pid;
1115
1116         return 0;
1117
1118 fail:
1119         unit_unwatch_timer(UNIT(s), &s->timer_watch);
1120
1121         return r;
1122 }
1123
1124 static void socket_enter_dead(Socket *s, bool success) {
1125         assert(s);
1126
1127         if (!success)
1128                 s->failure = true;
1129
1130         socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
1131 }
1132
1133 static void socket_enter_signal(Socket *s, SocketState state, bool success);
1134
1135 static void socket_enter_stop_post(Socket *s, bool success) {
1136         int r;
1137         assert(s);
1138
1139         if (!success)
1140                 s->failure = true;
1141
1142         socket_unwatch_control_pid(s);
1143
1144         s->control_command_id = SOCKET_EXEC_STOP_POST;
1145
1146         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1147                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1148                         goto fail;
1149
1150                 socket_set_state(s, SOCKET_STOP_POST);
1151         } else
1152                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
1153
1154         return;
1155
1156 fail:
1157         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
1158         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1159 }
1160
1161 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1162         int r;
1163         Set *pid_set = NULL;
1164         bool wait_for_exit = false;
1165
1166         assert(s);
1167
1168         if (!success)
1169                 s->failure = true;
1170
1171         if (s->exec_context.kill_mode != KILL_NONE) {
1172                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1173
1174                 if (s->control_pid > 0) {
1175                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1176
1177                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1178                         else
1179                                 wait_for_exit = true;
1180                 }
1181
1182                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1183
1184                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1185                                 r = -ENOMEM;
1186                                 goto fail;
1187                         }
1188
1189                         /* Exclude the control pid from being killed via the cgroup */
1190                         if (s->control_pid > 0)
1191                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1192                                         goto fail;
1193
1194                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
1195                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1196                                         log_warning("Failed to kill control group: %s", strerror(-r));
1197                         } else if (r > 0)
1198                                 wait_for_exit = true;
1199
1200                         set_free(pid_set);
1201                         pid_set = NULL;
1202                 }
1203         }
1204
1205         if (wait_for_exit) {
1206                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1207                         goto fail;
1208
1209                 socket_set_state(s, state);
1210         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1211                 socket_enter_stop_post(s, true);
1212         else
1213                 socket_enter_dead(s, true);
1214
1215         return;
1216
1217 fail:
1218         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1219
1220         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1221                 socket_enter_stop_post(s, false);
1222         else
1223                 socket_enter_dead(s, false);
1224
1225         if (pid_set)
1226                 set_free(pid_set);
1227 }
1228
1229 static void socket_enter_stop_pre(Socket *s, bool success) {
1230         int r;
1231         assert(s);
1232
1233         if (!success)
1234                 s->failure = true;
1235
1236         socket_unwatch_control_pid(s);
1237
1238         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1239
1240         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1241                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1242                         goto fail;
1243
1244                 socket_set_state(s, SOCKET_STOP_PRE);
1245         } else
1246                 socket_enter_stop_post(s, true);
1247
1248         return;
1249
1250 fail:
1251         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1252         socket_enter_stop_post(s, false);
1253 }
1254
1255 static void socket_enter_listening(Socket *s) {
1256         int r;
1257         assert(s);
1258
1259         if ((r = socket_watch_fds(s)) < 0) {
1260                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1261                 goto fail;
1262         }
1263
1264         socket_set_state(s, SOCKET_LISTENING);
1265         return;
1266
1267 fail:
1268         socket_enter_stop_pre(s, false);
1269 }
1270
1271 static void socket_enter_start_post(Socket *s) {
1272         int r;
1273         assert(s);
1274
1275         if ((r = socket_open_fds(s)) < 0) {
1276                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1277                 goto fail;
1278         }
1279
1280         socket_unwatch_control_pid(s);
1281
1282         s->control_command_id = SOCKET_EXEC_START_POST;
1283
1284         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1285                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1286                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1287                         goto fail;
1288                 }
1289
1290                 socket_set_state(s, SOCKET_START_POST);
1291         } else
1292                 socket_enter_listening(s);
1293
1294         return;
1295
1296 fail:
1297         socket_enter_stop_pre(s, false);
1298 }
1299
1300 static void socket_enter_start_pre(Socket *s) {
1301         int r;
1302         assert(s);
1303
1304         socket_unwatch_control_pid(s);
1305
1306         s->control_command_id = SOCKET_EXEC_START_PRE;
1307
1308         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1309                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1310                         goto fail;
1311
1312                 socket_set_state(s, SOCKET_START_PRE);
1313         } else
1314                 socket_enter_start_post(s);
1315
1316         return;
1317
1318 fail:
1319         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1320         socket_enter_dead(s, false);
1321 }
1322
1323 static void socket_enter_running(Socket *s, int cfd) {
1324         int r;
1325         DBusError error;
1326
1327         assert(s);
1328         dbus_error_init(&error);
1329
1330         /* We don't take connections anymore if we are supposed to
1331          * shut down anyway */
1332         if (unit_pending_inactive(UNIT(s))) {
1333                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", s->meta.id);
1334
1335                 if (cfd >= 0)
1336                         close_nointr_nofail(cfd);
1337                 else  {
1338                         /* Flush all sockets by closing and reopening them */
1339                         socket_close_fds(s);
1340
1341                         if ((r = socket_watch_fds(s)) < 0) {
1342                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1343                                 socket_enter_stop_pre(s, false);
1344                         }
1345                 }
1346
1347                 return;
1348         }
1349
1350         if (cfd < 0) {
1351                 bool pending = false;
1352                 Meta *i;
1353
1354                 /* If there's already a start pending don't bother to
1355                  * do anything */
1356                 LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
1357                         Service *service = (Service *) i;
1358
1359                         if (!set_get(service->configured_sockets, s))
1360                                 continue;
1361
1362                         if (!unit_pending_active(UNIT(service)))
1363                                 continue;
1364
1365                         pending = true;
1366                         break;
1367                 }
1368
1369                 if (!pending)
1370                         if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1371                                 goto fail;
1372
1373                 socket_set_state(s, SOCKET_RUNNING);
1374         } else {
1375                 char *prefix, *instance = NULL, *name;
1376                 Service *service;
1377
1378                 if (s->n_connections >= s->max_connections) {
1379                         log_warning("Too many incoming connections (%u)", s->n_connections);
1380                         close_nointr_nofail(cfd);
1381                         return;
1382                 }
1383
1384                 if ((r = socket_instantiate_service(s)) < 0)
1385                         goto fail;
1386
1387                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1388                         goto fail;
1389
1390                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1391                         free(instance);
1392                         r = -ENOMEM;
1393                         goto fail;
1394                 }
1395
1396                 name = unit_name_build(prefix, instance, ".service");
1397                 free(prefix);
1398                 free(instance);
1399
1400                 if (!name) {
1401                         r = -ENOMEM;
1402                         goto fail;
1403                 }
1404
1405                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1406                         free(name);
1407                         goto fail;
1408                 }
1409
1410                 service = s->service;
1411                 s->service = NULL;
1412                 s->n_accepted ++;
1413
1414                 service->meta.no_gc = false;
1415
1416                 unit_choose_id(UNIT(service), name);
1417                 free(name);
1418
1419                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1420                         goto fail;
1421
1422                 cfd = -1;
1423                 s->n_connections ++;
1424
1425                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1426                         goto fail;
1427
1428                 /* Notify clients about changed counters */
1429                 unit_add_to_dbus_queue(UNIT(s));
1430         }
1431
1432         return;
1433
1434 fail:
1435         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1436         socket_enter_stop_pre(s, false);
1437
1438         if (cfd >= 0)
1439                 close_nointr_nofail(cfd);
1440
1441         dbus_error_free(&error);
1442 }
1443
1444 static void socket_run_next(Socket *s, bool success) {
1445         int r;
1446
1447         assert(s);
1448         assert(s->control_command);
1449         assert(s->control_command->command_next);
1450
1451         if (!success)
1452                 s->failure = true;
1453
1454         socket_unwatch_control_pid(s);
1455
1456         s->control_command = s->control_command->command_next;
1457
1458         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1459                 goto fail;
1460
1461         return;
1462
1463 fail:
1464         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1465
1466         if (s->state == SOCKET_START_POST)
1467                 socket_enter_stop_pre(s, false);
1468         else if (s->state == SOCKET_STOP_POST)
1469                 socket_enter_dead(s, false);
1470         else
1471                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1472 }
1473
1474 static int socket_start(Unit *u) {
1475         Socket *s = SOCKET(u);
1476
1477         assert(s);
1478
1479         /* We cannot fulfill this request right now, try again later
1480          * please! */
1481         if (s->state == SOCKET_STOP_PRE ||
1482             s->state == SOCKET_STOP_PRE_SIGKILL ||
1483             s->state == SOCKET_STOP_PRE_SIGTERM ||
1484             s->state == SOCKET_STOP_POST ||
1485             s->state == SOCKET_FINAL_SIGTERM ||
1486             s->state == SOCKET_FINAL_SIGKILL)
1487                 return -EAGAIN;
1488
1489         if (s->state == SOCKET_START_PRE ||
1490             s->state == SOCKET_START_POST)
1491                 return 0;
1492
1493         /* Cannot run this without the service being around */
1494         if (s->service) {
1495                 if (s->service->meta.load_state != UNIT_LOADED) {
1496                         log_error("Socket service %s not loaded, refusing.", s->service->meta.id);
1497                         return -ENOENT;
1498                 }
1499
1500                 /* If the service is already active we cannot start the
1501                  * socket */
1502                 if (s->service->state != SERVICE_DEAD &&
1503                     s->service->state != SERVICE_FAILED &&
1504                     s->service->state != SERVICE_AUTO_RESTART) {
1505                         log_error("Socket service %s already active, refusing.", s->service->meta.id);
1506                         return -EBUSY;
1507                 }
1508
1509 #ifdef HAVE_SYSV_COMPAT
1510                 if (s->service->sysv_path) {
1511                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1512                         return -ENOENT;
1513                 }
1514 #endif
1515         }
1516
1517         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1518
1519         s->failure = false;
1520         socket_enter_start_pre(s);
1521         return 0;
1522 }
1523
1524 static int socket_stop(Unit *u) {
1525         Socket *s = SOCKET(u);
1526
1527         assert(s);
1528
1529         /* Already on it */
1530         if (s->state == SOCKET_STOP_PRE ||
1531             s->state == SOCKET_STOP_PRE_SIGTERM ||
1532             s->state == SOCKET_STOP_PRE_SIGKILL ||
1533             s->state == SOCKET_STOP_POST ||
1534             s->state == SOCKET_FINAL_SIGTERM ||
1535             s->state == SOCKET_FINAL_SIGKILL)
1536                 return 0;
1537
1538         /* If there's already something running we go directly into
1539          * kill mode. */
1540         if (s->state == SOCKET_START_PRE ||
1541             s->state == SOCKET_START_POST) {
1542                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1543                 return -EAGAIN;
1544         }
1545
1546         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1547
1548         socket_enter_stop_pre(s, true);
1549         return 0;
1550 }
1551
1552 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1553         Socket *s = SOCKET(u);
1554         SocketPort *p;
1555         int r;
1556
1557         assert(u);
1558         assert(f);
1559         assert(fds);
1560
1561         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1562         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1563         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1564
1565         if (s->control_pid > 0)
1566                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1567
1568         if (s->control_command_id >= 0)
1569                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1570
1571         LIST_FOREACH(port, p, s->ports) {
1572                 int copy;
1573
1574                 if (p->fd < 0)
1575                         continue;
1576
1577                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1578                         return copy;
1579
1580                 if (p->type == SOCKET_SOCKET) {
1581                         char *t;
1582
1583                         if ((r = socket_address_print(&p->address, &t)) < 0)
1584                                 return r;
1585
1586                         if (socket_address_family(&p->address) == AF_NETLINK)
1587                                 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
1588                         else
1589                                 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1590                         free(t);
1591                 } else if (p->type == SOCKET_SPECIAL)
1592                         unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
1593                 else {
1594                         assert(p->type == SOCKET_FIFO);
1595                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1596                 }
1597         }
1598
1599         return 0;
1600 }
1601
1602 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1603         Socket *s = SOCKET(u);
1604
1605         assert(u);
1606         assert(key);
1607         assert(value);
1608         assert(fds);
1609
1610         if (streq(key, "state")) {
1611                 SocketState state;
1612
1613                 if ((state = socket_state_from_string(value)) < 0)
1614                         log_debug("Failed to parse state value %s", value);
1615                 else
1616                         s->deserialized_state = state;
1617         } else if (streq(key, "failure")) {
1618                 int b;
1619
1620                 if ((b = parse_boolean(value)) < 0)
1621                         log_debug("Failed to parse failure value %s", value);
1622                 else
1623                         s->failure = b || s->failure;
1624
1625         } else if (streq(key, "n-accepted")) {
1626                 unsigned k;
1627
1628                 if (safe_atou(value, &k) < 0)
1629                         log_debug("Failed to parse n-accepted value %s", value);
1630                 else
1631                         s->n_accepted += k;
1632         } else if (streq(key, "control-pid")) {
1633                 pid_t pid;
1634
1635                 if (parse_pid(value, &pid) < 0)
1636                         log_debug("Failed to parse control-pid value %s", value);
1637                 else
1638                         s->control_pid = pid;
1639         } else if (streq(key, "control-command")) {
1640                 SocketExecCommand id;
1641
1642                 if ((id = socket_exec_command_from_string(value)) < 0)
1643                         log_debug("Failed to parse exec-command value %s", value);
1644                 else {
1645                         s->control_command_id = id;
1646                         s->control_command = s->exec_command[id];
1647                 }
1648         } else if (streq(key, "fifo")) {
1649                 int fd, skip = 0;
1650                 SocketPort *p;
1651
1652                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1653                         log_debug("Failed to parse fifo value %s", value);
1654                 else {
1655
1656                         LIST_FOREACH(port, p, s->ports)
1657                                 if (p->type == SOCKET_FIFO &&
1658                                     streq_ptr(p->path, value+skip))
1659                                         break;
1660
1661                         if (p) {
1662                                 if (p->fd >= 0)
1663                                         close_nointr_nofail(p->fd);
1664                                 p->fd = fdset_remove(fds, fd);
1665                         }
1666                 }
1667
1668         } else if (streq(key, "special")) {
1669                 int fd, skip = 0;
1670                 SocketPort *p;
1671
1672                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1673                         log_debug("Failed to parse special value %s", value);
1674                 else {
1675
1676                         LIST_FOREACH(port, p, s->ports)
1677                                 if (p->type == SOCKET_SPECIAL &&
1678                                     streq_ptr(p->path, value+skip))
1679                                         break;
1680
1681                         if (p) {
1682                                 if (p->fd >= 0)
1683                                         close_nointr_nofail(p->fd);
1684                                 p->fd = fdset_remove(fds, fd);
1685                         }
1686                 }
1687
1688         } else if (streq(key, "socket")) {
1689                 int fd, type, skip = 0;
1690                 SocketPort *p;
1691
1692                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1693                         log_debug("Failed to parse socket value %s", value);
1694                 else {
1695
1696                         LIST_FOREACH(port, p, s->ports)
1697                                 if (socket_address_is(&p->address, value+skip, type))
1698                                         break;
1699
1700                         if (p) {
1701                                 if (p->fd >= 0)
1702                                         close_nointr_nofail(p->fd);
1703                                 p->fd = fdset_remove(fds, fd);
1704                         }
1705                 }
1706
1707         } else if (streq(key, "netlink")) {
1708                 int fd, skip = 0;
1709                 SocketPort *p;
1710
1711                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1712                         log_debug("Failed to parse socket value %s", value);
1713                 else {
1714
1715                         LIST_FOREACH(port, p, s->ports)
1716                                 if (socket_address_is_netlink(&p->address, value+skip))
1717                                         break;
1718
1719                         if (p) {
1720                                 if (p->fd >= 0)
1721                                         close_nointr_nofail(p->fd);
1722                                 p->fd = fdset_remove(fds, fd);
1723                         }
1724                 }
1725
1726         } else
1727                 log_debug("Unknown serialization key '%s'", key);
1728
1729         return 0;
1730 }
1731
1732 static UnitActiveState socket_active_state(Unit *u) {
1733         assert(u);
1734
1735         return state_translation_table[SOCKET(u)->state];
1736 }
1737
1738 static const char *socket_sub_state_to_string(Unit *u) {
1739         assert(u);
1740
1741         return socket_state_to_string(SOCKET(u)->state);
1742 }
1743
1744 static bool socket_check_gc(Unit *u) {
1745         Socket *s = SOCKET(u);
1746
1747         assert(u);
1748
1749         return s->n_connections > 0;
1750 }
1751
1752 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1753         Socket *s = SOCKET(u);
1754         int cfd = -1;
1755
1756         assert(s);
1757         assert(fd >= 0);
1758
1759         if (s->state != SOCKET_LISTENING)
1760                 return;
1761
1762         log_debug("Incoming traffic on %s", u->meta.id);
1763
1764         if (events != EPOLLIN) {
1765
1766                 if (events & EPOLLHUP)
1767                         log_error("%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.", u->meta.id);
1768                 else
1769                         log_error("%s: Got unexpected poll event (0x%x) on socket.", u->meta.id, events);
1770
1771                 goto fail;
1772         }
1773
1774         if (w->socket_accept) {
1775                 for (;;) {
1776
1777                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1778
1779                                 if (errno == EINTR)
1780                                         continue;
1781
1782                                 log_error("Failed to accept socket: %m");
1783                                 goto fail;
1784                         }
1785
1786                         break;
1787                 }
1788
1789                 socket_apply_socket_options(s, cfd);
1790         }
1791
1792         socket_enter_running(s, cfd);
1793         return;
1794
1795 fail:
1796         socket_enter_stop_pre(s, false);
1797 }
1798
1799 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1800         Socket *s = SOCKET(u);
1801         bool success;
1802
1803         assert(s);
1804         assert(pid >= 0);
1805
1806         if (pid != s->control_pid)
1807                 return;
1808
1809         s->control_pid = 0;
1810
1811         success = is_clean_exit(code, status);
1812
1813         if (s->control_command) {
1814                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1815
1816                 if (s->control_command->ignore)
1817                         success = true;
1818         }
1819
1820         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1821                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1822         s->failure = s->failure || !success;
1823
1824         if (s->control_command && s->control_command->command_next && success) {
1825                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1826                 socket_run_next(s, success);
1827         } else {
1828                 s->control_command = NULL;
1829                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1830
1831                 /* No further commands for this step, so let's figure
1832                  * out what to do next */
1833
1834                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1835
1836                 switch (s->state) {
1837
1838                 case SOCKET_START_PRE:
1839                         if (success)
1840                                 socket_enter_start_post(s);
1841                         else
1842                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1843                         break;
1844
1845                 case SOCKET_START_POST:
1846                         if (success)
1847                                 socket_enter_listening(s);
1848                         else
1849                                 socket_enter_stop_pre(s, false);
1850                         break;
1851
1852                 case SOCKET_STOP_PRE:
1853                 case SOCKET_STOP_PRE_SIGTERM:
1854                 case SOCKET_STOP_PRE_SIGKILL:
1855                         socket_enter_stop_post(s, success);
1856                         break;
1857
1858                 case SOCKET_STOP_POST:
1859                 case SOCKET_FINAL_SIGTERM:
1860                 case SOCKET_FINAL_SIGKILL:
1861                         socket_enter_dead(s, success);
1862                         break;
1863
1864                 default:
1865                         assert_not_reached("Uh, control process died at wrong time.");
1866                 }
1867         }
1868
1869         /* Notify clients about changed exit status */
1870         unit_add_to_dbus_queue(u);
1871 }
1872
1873 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1874         Socket *s = SOCKET(u);
1875
1876         assert(s);
1877         assert(elapsed == 1);
1878         assert(w == &s->timer_watch);
1879
1880         switch (s->state) {
1881
1882         case SOCKET_START_PRE:
1883                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1884                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1885                 break;
1886
1887         case SOCKET_START_POST:
1888                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1889                 socket_enter_stop_pre(s, false);
1890                 break;
1891
1892         case SOCKET_STOP_PRE:
1893                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1894                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1895                 break;
1896
1897         case SOCKET_STOP_PRE_SIGTERM:
1898                 if (s->exec_context.send_sigkill) {
1899                         log_warning("%s stopping timed out. Killing.", u->meta.id);
1900                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1901                 } else {
1902                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1903                         socket_enter_stop_post(s, false);
1904                 }
1905                 break;
1906
1907         case SOCKET_STOP_PRE_SIGKILL:
1908                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1909                 socket_enter_stop_post(s, false);
1910                 break;
1911
1912         case SOCKET_STOP_POST:
1913                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1914                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1915                 break;
1916
1917         case SOCKET_FINAL_SIGTERM:
1918                 if (s->exec_context.send_sigkill) {
1919                         log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1920                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1921                 } else {
1922                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->meta.id);
1923                         socket_enter_dead(s, false);
1924                 }
1925                 break;
1926
1927         case SOCKET_FINAL_SIGKILL:
1928                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
1929                 socket_enter_dead(s, false);
1930                 break;
1931
1932         default:
1933                 assert_not_reached("Timeout at wrong time.");
1934         }
1935 }
1936
1937 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1938         int *rfds;
1939         unsigned rn_fds, k;
1940         SocketPort *p;
1941
1942         assert(s);
1943         assert(fds);
1944         assert(n_fds);
1945
1946         /* Called from the service code for requesting our fds */
1947
1948         rn_fds = 0;
1949         LIST_FOREACH(port, p, s->ports)
1950                 if (p->fd >= 0)
1951                         rn_fds++;
1952
1953         if (!(rfds = new(int, rn_fds)))
1954                 return -ENOMEM;
1955
1956         k = 0;
1957         LIST_FOREACH(port, p, s->ports)
1958                 if (p->fd >= 0)
1959                         rfds[k++] = p->fd;
1960
1961         assert(k == rn_fds);
1962
1963         *fds = rfds;
1964         *n_fds = rn_fds;
1965
1966         return 0;
1967 }
1968
1969 void socket_notify_service_dead(Socket *s) {
1970         assert(s);
1971
1972         /* The service is dead. Dang!
1973          *
1974          * This is strictly for one-instance-for-all-connections
1975          * services. */
1976
1977         if (s->state == SOCKET_RUNNING) {
1978                 log_debug("%s got notified about service death.", s->meta.id);
1979                 socket_enter_listening(s);
1980         }
1981 }
1982
1983 void socket_connection_unref(Socket *s) {
1984         assert(s);
1985
1986         /* The service is dead. Yay!
1987          *
1988          * This is strictly for one-instance-per-connection
1989          * services. */
1990
1991         assert(s->n_connections > 0);
1992         s->n_connections--;
1993
1994         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1995 }
1996
1997 static void socket_reset_failed(Unit *u) {
1998         Socket *s = SOCKET(u);
1999
2000         assert(s);
2001
2002         if (s->state == SOCKET_FAILED)
2003                 socket_set_state(s, SOCKET_DEAD);
2004
2005         s->failure = false;
2006 }
2007
2008 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
2009         Socket *s = SOCKET(u);
2010         int r = 0;
2011         Set *pid_set = NULL;
2012
2013         assert(s);
2014
2015         if (who == KILL_MAIN) {
2016                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
2017                 return -EINVAL;
2018         }
2019
2020         if (s->control_pid <= 0 && who == KILL_CONTROL) {
2021                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
2022                 return -ENOENT;
2023         }
2024
2025         if (s->control_pid > 0)
2026                 if (kill(s->control_pid, signo) < 0)
2027                         r = -errno;
2028
2029         if (mode == KILL_CONTROL_GROUP) {
2030                 int q;
2031
2032                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
2033                         return -ENOMEM;
2034
2035                 /* Exclude the control pid from being killed via the cgroup */
2036                 if (s->control_pid > 0)
2037                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
2038                                 r = q;
2039                                 goto finish;
2040                         }
2041
2042                 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
2043                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
2044                                 r = q;
2045         }
2046
2047 finish:
2048         if (pid_set)
2049                 set_free(pid_set);
2050
2051         return r;
2052 }
2053
2054 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2055         [SOCKET_DEAD] = "dead",
2056         [SOCKET_START_PRE] = "start-pre",
2057         [SOCKET_START_POST] = "start-post",
2058         [SOCKET_LISTENING] = "listening",
2059         [SOCKET_RUNNING] = "running",
2060         [SOCKET_STOP_PRE] = "stop-pre",
2061         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2062         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2063         [SOCKET_STOP_POST] = "stop-post",
2064         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2065         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2066         [SOCKET_FAILED] = "failed"
2067 };
2068
2069 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2070
2071 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2072         [SOCKET_EXEC_START_PRE] = "StartPre",
2073         [SOCKET_EXEC_START_POST] = "StartPost",
2074         [SOCKET_EXEC_STOP_PRE] = "StopPre",
2075         [SOCKET_EXEC_STOP_POST] = "StopPost"
2076 };
2077
2078 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2079
2080 const UnitVTable socket_vtable = {
2081         .suffix = ".socket",
2082
2083         .init = socket_init,
2084         .done = socket_done,
2085         .load = socket_load,
2086
2087         .kill = socket_kill,
2088
2089         .coldplug = socket_coldplug,
2090
2091         .dump = socket_dump,
2092
2093         .start = socket_start,
2094         .stop = socket_stop,
2095
2096         .serialize = socket_serialize,
2097         .deserialize_item = socket_deserialize_item,
2098
2099         .active_state = socket_active_state,
2100         .sub_state_to_string = socket_sub_state_to_string,
2101
2102         .check_gc = socket_check_gc,
2103
2104         .fd_event = socket_fd_event,
2105         .sigchld_event = socket_sigchld_event,
2106         .timer_event = socket_timer_event,
2107
2108         .reset_failed = socket_reset_failed,
2109
2110         .bus_interface = "org.freedesktop.systemd1.Socket",
2111         .bus_message_handler = bus_socket_message_handler,
2112         .bus_invalidating_properties =  bus_socket_invalidating_properties
2113 };