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