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 type) {
 370
 371         if (type == SOCK_STREAM)
 372                 return "ListenStream";
 373         else if (type == SOCK_DGRAM)
 374                 return "ListenDatagram";
 375         else if (type == SOCK_SEQPACKET)
 376                 return "ListenSequentialPacket";
 377
 378         assert_not_reached("Unknown socket type");
 379         return NULL;
 380 }
 381
 382 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 383
 384         SocketExecCommand c;
 385         Socket *s = SOCKET(u);
 386         SocketPort *p;
 387         const char *prefix2;
 388         char *p2;
 389
 390         assert(s);
 391         assert(f);
 392
 393         p2 = strappend(prefix, "\t");
 394         prefix2 = p2 ? p2 : prefix;
 395
 396         fprintf(f,
 397                 "%sSocket State: %s\n"
 398                 "%sBindIPv6Only: %s\n"
 399                 "%sBacklog: %u\n"
 400                 "%sSocketMode: %04o\n"
 401                 "%sDirectoryMode: %04o\n"
 402                 "%sKeepAlive: %s\n"
 403                 "%sFreeBind: %s\n"
 404                 "%sTCPCongestion: %s\n",
 405                 prefix, socket_state_to_string(s->state),
 406                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 407                 prefix, s->backlog,
 408                 prefix, s->socket_mode,
 409                 prefix, s->directory_mode,
 410                 prefix, yes_no(s->keep_alive),
 411                 prefix, yes_no(s->free_bind),
 412                 prefix, strna(s->tcp_congestion));
 413
 414         if (s->control_pid > 0)
 415                 fprintf(f,
 416                         "%sControl PID: %lu\n",
 417                         prefix, (unsigned long) s->control_pid);
 418
 419         if (s->bind_to_device)
 420                 fprintf(f,
 421                         "%sBindToDevice: %s\n",
 422                         prefix, s->bind_to_device);
 423
 424         if (s->accept)
 425                 fprintf(f,
 426                         "%sAccepted: %u\n"
 427                         "%sNConnections: %u\n"
 428                         "%sMaxConnections: %u\n",
 429                         prefix, s->n_accepted,
 430                         prefix, s->n_connections,
 431                         prefix, s->max_connections);
 432
 433         if (s->priority >= 0)
 434                 fprintf(f,
 435                         "%sPriority: %i\n",
 436                         prefix, s->priority);
 437
 438         if (s->receive_buffer > 0)
 439                 fprintf(f,
 440                         "%sReceiveBuffer: %zu\n",
 441                         prefix, s->receive_buffer);
 442
 443         if (s->send_buffer > 0)
 444                 fprintf(f,
 445                         "%sSendBuffer: %zu\n",
 446                         prefix, s->send_buffer);
 447
 448         if (s->ip_tos >= 0)
 449                 fprintf(f,
 450                         "%sIPTOS: %i\n",
 451                         prefix, s->ip_tos);
 452
 453         if (s->ip_ttl >= 0)
 454                 fprintf(f,
 455                         "%sIPTTL: %i\n",
 456                         prefix, s->ip_ttl);
 457
 458         if (s->pipe_size > 0)
 459                 fprintf(f,
 460                         "%sPipeSize: %zu\n",
 461                         prefix, s->pipe_size);
 462
 463         if (s->mark >= 0)
 464                 fprintf(f,
 465                         "%sMark: %i\n",
 466                         prefix, s->mark);
 467
 468         LIST_FOREACH(port, p, s->ports) {
 469
 470                 if (p->type == SOCKET_SOCKET) {
 471                         const char *t;
 472                         int r;
 473                         char *k = NULL;
 474
 475                         if ((r = socket_address_print(&p->address, &k)) < 0)
 476                                 t = strerror(-r);
 477                         else
 478                                 t = k;
 479
 480                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t);
 481                         free(k);
 482                 } else
 483                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 484         }
 485
 486         exec_context_dump(&s->exec_context, f, prefix);
 487
 488         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 489                 if (!s->exec_command[c])
 490                         continue;
 491
 492                 fprintf(f, "%s-> %s:\n",
 493                         prefix, socket_exec_command_to_string(c));
 494
 495                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 496         }
 497
 498         free(p2);
 499 }
 500
 501 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 502         socklen_t l;
 503         char *r;
 504         union {
 505                 struct sockaddr sa;
 506                 struct sockaddr_un un;
 507                 struct sockaddr_in in;
 508                 struct sockaddr_in6 in6;
 509                 struct sockaddr_storage storage;
 510         } local, remote;
 511
 512         assert(fd >= 0);
 513         assert(instance);
 514
 515         l = sizeof(local);
 516         if (getsockname(fd, &local.sa, &l) < 0)
 517                 return -errno;
 518
 519         l = sizeof(remote);
 520         if (getpeername(fd, &remote.sa, &l) < 0)
 521                 return -errno;
 522
 523         switch (local.sa.sa_family) {
 524
 525         case AF_INET: {
 526                 uint32_t
 527                         a = ntohl(local.in.sin_addr.s_addr),
 528                         b = ntohl(remote.in.sin_addr.s_addr);
 529
 530                 if (asprintf(&r,
 531                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 532                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 533                              ntohs(local.in.sin_port),
 534                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 535                              ntohs(remote.in.sin_port)) < 0)
 536                         return -ENOMEM;
 537
 538                 break;
 539         }
 540
 541         case AF_INET6: {
 542                 static const char ipv4_prefix[] = {
 543                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 544                 };
 545
 546                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 547                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 548                         const uint8_t
 549                                 *a = local.in6.sin6_addr.s6_addr+12,
 550                                 *b = remote.in6.sin6_addr.s6_addr+12;
 551
 552                         if (asprintf(&r,
 553                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 554                                      a[0], a[1], a[2], a[3],
 555                                      ntohs(local.in6.sin6_port),
 556                                      b[0], b[1], b[2], b[3],
 557                                      ntohs(remote.in6.sin6_port)) < 0)
 558                                 return -ENOMEM;
 559                 } else {
 560                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 561
 562                         if (asprintf(&r,
 563                                      "%s:%u-%s:%u",
 564                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 565                                      ntohs(local.in6.sin6_port),
 566                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 567                                      ntohs(remote.in6.sin6_port)) < 0)
 568                                 return -ENOMEM;
 569                 }
 570
 571                 break;
 572         }
 573
 574         case AF_UNIX: {
 575                 struct ucred ucred;
 576
 577                 l = sizeof(ucred);
 578                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 579                         return -errno;
 580
 581                 if (asprintf(&r,
 582                              "%u-%lu-%lu",
 583                              nr,
 584                              (unsigned long) ucred.pid,
 585                              (unsigned long) ucred.uid) < 0)
 586                         return -ENOMEM;
 587
 588                 break;
 589         }
 590
 591         default:
 592                 assert_not_reached("Unhandled socket type.");
 593         }
 594
 595         *instance = r;
 596         return 0;
 597 }
 598
 599 static void socket_close_fds(Socket *s) {
 600         SocketPort *p;
 601
 602         assert(s);
 603
 604         LIST_FOREACH(port, p, s->ports) {
 605                 if (p->fd < 0)
 606                         continue;
 607
 608                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 609                 close_nointr_nofail(p->fd);
 610
 611                 /* One little note: we should never delete any sockets
 612                  * in the file system here! After all some other
 613                  * process we spawned might still have a reference of
 614                  * this fd and wants to continue to use it. Therefore
 615                  * we delete sockets in the file system before we
 616                  * create a new one, not after we stopped using
 617                  * one! */
 618
 619                 p->fd = -1;
 620         }
 621 }
 622
 623 static void socket_apply_socket_options(Socket *s, int fd) {
 624         assert(s);
 625         assert(fd >= 0);
 626
 627         if (s->keep_alive) {
 628                 int b = s->keep_alive;
 629                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 630                         log_warning("SO_KEEPALIVE failed: %m");
 631         }
 632
 633         if (s->priority >= 0)
 634                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 635                         log_warning("SO_PRIORITY failed: %m");
 636
 637         if (s->receive_buffer > 0) {
 638                 int value = (int) s->receive_buffer;
 639                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 640                         log_warning("SO_RCVBUF failed: %m");
 641         }
 642
 643         if (s->send_buffer > 0) {
 644                 int value = (int) s->send_buffer;
 645                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 646                         log_warning("SO_SNDBUF failed: %m");
 647         }
 648
 649         if (s->mark >= 0)
 650                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 651                         log_warning("SO_MARK failed: %m");
 652
 653         if (s->ip_tos >= 0)
 654                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 655                         log_warning("IP_TOS failed: %m");
 656
 657         if (s->ip_ttl >= 0) {
 658                 int r, x;
 659
 660                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 661
 662                 if (socket_ipv6_is_supported())
 663                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 664                 else {
 665                         x = -1;
 666                         errno = EAFNOSUPPORT;
 667                 }
 668
 669                 if (r < 0 && x < 0)
 670                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 671         }
 672
 673         if (s->tcp_congestion)
 674                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 675                         log_warning("TCP_CONGESTION failed: %m");
 676 }
 677
 678 static void socket_apply_fifo_options(Socket *s, int fd) {
 679         assert(s);
 680         assert(fd >= 0);
 681
 682         if (s->pipe_size > 0)
 683                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 684                         log_warning("F_SETPIPE_SZ: %m");
 685 }
 686
 687
 688 static int fifo_address_create(
 689                 const char *path,
 690                 mode_t directory_mode,
 691                 mode_t socket_mode,
 692                 int *_fd) {
 693
 694         int fd = -1, r = 0;
 695         struct stat st;
 696         mode_t old_mask;
 697
 698         assert(path);
 699         assert(_fd);
 700
 701         mkdir_parents(path, directory_mode);
 702
 703         if ((r = label_fifofile_set(path)) < 0)
 704                 goto fail;
 705
 706         /* Enforce the right access mode for the fifo */
 707         old_mask = umask(~ socket_mode);
 708
 709         /* Include the original umask in our mask */
 710         umask(~socket_mode | old_mask);
 711
 712         r = mkfifo(path, socket_mode);
 713         umask(old_mask);
 714
 715         if (r < 0) {
 716                 r = -errno;
 717                 goto fail;
 718         }
 719
 720         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 721                 r = -errno;
 722                 goto fail;
 723         }
 724
 725         label_file_clear();
 726
 727         if (fstat(fd, &st) < 0) {
 728                 r = -errno;
 729                 goto fail;
 730         }
 731
 732         if (!S_ISFIFO(st.st_mode) ||
 733             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 734             st.st_uid != getuid() ||
 735             st.st_gid != getgid()) {
 736
 737                 r = -EEXIST;
 738                 goto fail;
 739         }
 740
 741         *_fd = fd;
 742         return 0;
 743
 744 fail:
 745         label_file_clear();
 746
 747         if (fd >= 0)
 748                 close_nointr_nofail(fd);
 749
 750         return r;
 751 }
 752
 753 static int socket_open_fds(Socket *s) {
 754         SocketPort *p;
 755         int r;
 756         char *label = NULL;
 757         bool know_label = false;
 758
 759         assert(s);
 760
 761         LIST_FOREACH(port, p, s->ports) {
 762
 763                 if (p->fd >= 0)
 764                         continue;
 765
 766                 if (p->type == SOCKET_SOCKET) {
 767
 768                         if (!know_label) {
 769
 770                                 if ((r = socket_instantiate_service(s)) < 0)
 771                                         return r;
 772
 773                                 if (s->service && s->service->exec_command[SERVICE_EXEC_START])
 774                                         if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
 775                                                 return r;
 776
 777                                 know_label = true;
 778                         }
 779
 780                         if ((r = socket_address_listen(
 781                                              &p->address,
 782                                              s->backlog,
 783                                              s->bind_ipv6_only,
 784                                              s->bind_to_device,
 785                                              s->free_bind,
 786                                              s->directory_mode,
 787                                              s->socket_mode,
 788                                              label,
 789                                              &p->fd)) < 0)
 790                                 goto rollback;
 791
 792                         socket_apply_socket_options(s, p->fd);
 793
 794                 } else  if (p->type == SOCKET_FIFO) {
 795
 796                         if ((r = fifo_address_create(
 797                                              p->path,
 798                                              s->directory_mode,
 799                                              s->socket_mode,
 800                                              &p->fd)) < 0)
 801                                 goto rollback;
 802
 803                         socket_apply_fifo_options(s, p->fd);
 804
 805                 } else
 806                         assert_not_reached("Unknown port type");
 807         }
 808
 809         label_free(label);
 810         return 0;
 811
 812 rollback:
 813         socket_close_fds(s);
 814         label_free(label);
 815         return r;
 816 }
 817
 818 static void socket_unwatch_fds(Socket *s) {
 819         SocketPort *p;
 820
 821         assert(s);
 822
 823         LIST_FOREACH(port, p, s->ports) {
 824                 if (p->fd < 0)
 825                         continue;
 826
 827                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 828         }
 829 }
 830
 831 static int socket_watch_fds(Socket *s) {
 832         SocketPort *p;
 833         int r;
 834
 835         assert(s);
 836
 837         LIST_FOREACH(port, p, s->ports) {
 838                 if (p->fd < 0)
 839                         continue;
 840
 841                 p->fd_watch.socket_accept =
 842                         s->accept &&
 843                         p->type == SOCKET_SOCKET &&
 844                         socket_address_can_accept(&p->address);
 845
 846                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 847                         goto fail;
 848         }
 849
 850         return 0;
 851
 852 fail:
 853         socket_unwatch_fds(s);
 854         return r;
 855 }
 856
 857 static void socket_set_state(Socket *s, SocketState state) {
 858         SocketState old_state;
 859         assert(s);
 860
 861         old_state = s->state;
 862         s->state = state;
 863
 864         if (state != SOCKET_START_PRE &&
 865             state != SOCKET_START_POST &&
 866             state != SOCKET_STOP_PRE &&
 867             state != SOCKET_STOP_PRE_SIGTERM &&
 868             state != SOCKET_STOP_PRE_SIGKILL &&
 869             state != SOCKET_STOP_POST &&
 870             state != SOCKET_FINAL_SIGTERM &&
 871             state != SOCKET_FINAL_SIGKILL) {
 872                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 873                 socket_unwatch_control_pid(s);
 874                 s->control_command = NULL;
 875                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 876         }
 877
 878         if (state != SOCKET_LISTENING)
 879                 socket_unwatch_fds(s);
 880
 881         if (state != SOCKET_START_POST &&
 882             state != SOCKET_LISTENING &&
 883             state != SOCKET_RUNNING &&
 884             state != SOCKET_STOP_PRE &&
 885             state != SOCKET_STOP_PRE_SIGTERM &&
 886             state != SOCKET_STOP_PRE_SIGKILL)
 887                 socket_close_fds(s);
 888
 889         if (state != old_state)
 890                 log_debug("%s changed %s -> %s",
 891                           s->meta.id,
 892                           socket_state_to_string(old_state),
 893                           socket_state_to_string(state));
 894
 895         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
 896 }
 897
 898 static int socket_coldplug(Unit *u) {
 899         Socket *s = SOCKET(u);
 900         int r;
 901
 902         assert(s);
 903         assert(s->state == SOCKET_DEAD);
 904
 905         if (s->deserialized_state != s->state) {
 906
 907                 if (s->deserialized_state == SOCKET_START_PRE ||
 908                     s->deserialized_state == SOCKET_START_POST ||
 909                     s->deserialized_state == SOCKET_STOP_PRE ||
 910                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 911                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 912                     s->deserialized_state == SOCKET_STOP_POST ||
 913                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 914                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 915
 916                         if (s->control_pid <= 0)
 917                                 return -EBADMSG;
 918
 919                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 920                                 return r;
 921
 922                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 923                                 return r;
 924                 }
 925
 926                 if (s->deserialized_state == SOCKET_START_POST ||
 927                     s->deserialized_state == SOCKET_LISTENING ||
 928                     s->deserialized_state == SOCKET_RUNNING ||
 929                     s->deserialized_state == SOCKET_STOP_PRE ||
 930                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 931                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 932                         if ((r = socket_open_fds(s)) < 0)
 933                                 return r;
 934
 935                 if (s->deserialized_state == SOCKET_LISTENING)
 936                         if ((r = socket_watch_fds(s)) < 0)
 937                                 return r;
 938
 939                 socket_set_state(s, s->deserialized_state);
 940         }
 941
 942         return 0;
 943 }
 944
 945 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 946         pid_t pid;
 947         int r;
 948         char **argv;
 949
 950         assert(s);
 951         assert(c);
 952         assert(_pid);
 953
 954         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 955                 goto fail;
 956
 957         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 958                 r = -ENOMEM;
 959                 goto fail;
 960         }
 961
 962         r = exec_spawn(c,
 963                        argv,
 964                        &s->exec_context,
 965                        NULL, 0,
 966                        s->meta.manager->environment,
 967                        true,
 968                        true,
 969                        true,
 970                        s->meta.manager->confirm_spawn,
 971                        s->meta.cgroup_bondings,
 972                        &pid);
 973
 974         strv_free(argv);
 975         if (r < 0)
 976                 goto fail;
 977
 978         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 979                 /* FIXME: we need to do something here */
 980                 goto fail;
 981
 982         *_pid = pid;
 983
 984         return 0;
 985
 986 fail:
 987         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 988
 989         return r;
 990 }
 991
 992 static void socket_enter_dead(Socket *s, bool success) {
 993         assert(s);
 994
 995         if (!success)
 996                 s->failure = true;
 997
 998         socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
 999 }
1000
1001 static void socket_enter_signal(Socket *s, SocketState state, bool success);
1002
1003 static void socket_enter_stop_post(Socket *s, bool success) {
1004         int r;
1005         assert(s);
1006
1007         if (!success)
1008                 s->failure = true;
1009
1010         socket_unwatch_control_pid(s);
1011
1012         s->control_command_id = SOCKET_EXEC_STOP_POST;
1013
1014         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1015                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1016                         goto fail;
1017
1018                 socket_set_state(s, SOCKET_STOP_POST);
1019         } else
1020                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
1021
1022         return;
1023
1024 fail:
1025         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
1026         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1027 }
1028
1029 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1030         int r;
1031         Set *pid_set = NULL;
1032         bool wait_for_exit = false;
1033
1034         assert(s);
1035
1036         if (!success)
1037                 s->failure = true;
1038
1039         if (s->exec_context.kill_mode != KILL_NONE) {
1040                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1041
1042                 if (s->control_pid > 0) {
1043                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1044
1045                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1046                         else
1047                                 wait_for_exit = true;
1048                 }
1049
1050                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1051
1052                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1053                                 r = -ENOMEM;
1054                                 goto fail;
1055                         }
1056
1057                         /* Exclude the control pid from being killed via the cgroup */
1058                         if (s->control_pid > 0)
1059                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1060                                         goto fail;
1061
1062                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
1063                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1064                                         log_warning("Failed to kill control group: %s", strerror(-r));
1065                         } else if (r > 0)
1066                                 wait_for_exit = true;
1067
1068                         set_free(pid_set);
1069                         pid_set = NULL;
1070                 }
1071         }
1072
1073         if (wait_for_exit) {
1074                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1075                         goto fail;
1076
1077                 socket_set_state(s, state);
1078         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1079                 socket_enter_stop_post(s, true);
1080         else
1081                 socket_enter_dead(s, true);
1082
1083         return;
1084
1085 fail:
1086         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1087
1088         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1089                 socket_enter_stop_post(s, false);
1090         else
1091                 socket_enter_dead(s, false);
1092
1093         if (pid_set)
1094                 set_free(pid_set);
1095 }
1096
1097 static void socket_enter_stop_pre(Socket *s, bool success) {
1098         int r;
1099         assert(s);
1100
1101         if (!success)
1102                 s->failure = true;
1103
1104         socket_unwatch_control_pid(s);
1105
1106         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1107
1108         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1109                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1110                         goto fail;
1111
1112                 socket_set_state(s, SOCKET_STOP_PRE);
1113         } else
1114                 socket_enter_stop_post(s, true);
1115
1116         return;
1117
1118 fail:
1119         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1120         socket_enter_stop_post(s, false);
1121 }
1122
1123 static void socket_enter_listening(Socket *s) {
1124         int r;
1125         assert(s);
1126
1127         if ((r = socket_watch_fds(s)) < 0) {
1128                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1129                 goto fail;
1130         }
1131
1132         socket_set_state(s, SOCKET_LISTENING);
1133         return;
1134
1135 fail:
1136         socket_enter_stop_pre(s, false);
1137 }
1138
1139 static void socket_enter_start_post(Socket *s) {
1140         int r;
1141         assert(s);
1142
1143         if ((r = socket_open_fds(s)) < 0) {
1144                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1145                 goto fail;
1146         }
1147
1148         socket_unwatch_control_pid(s);
1149
1150         s->control_command_id = SOCKET_EXEC_START_POST;
1151
1152         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1153                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1154                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1155                         goto fail;
1156                 }
1157
1158                 socket_set_state(s, SOCKET_START_POST);
1159         } else
1160                 socket_enter_listening(s);
1161
1162         return;
1163
1164 fail:
1165         socket_enter_stop_pre(s, false);
1166 }
1167
1168 static void socket_enter_start_pre(Socket *s) {
1169         int r;
1170         assert(s);
1171
1172         socket_unwatch_control_pid(s);
1173
1174         s->control_command_id = SOCKET_EXEC_START_PRE;
1175
1176         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1177                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1178                         goto fail;
1179
1180                 socket_set_state(s, SOCKET_START_PRE);
1181         } else
1182                 socket_enter_start_post(s);
1183
1184         return;
1185
1186 fail:
1187         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1188         socket_enter_dead(s, false);
1189 }
1190
1191 static void socket_enter_running(Socket *s, int cfd) {
1192         int r;
1193         DBusError error;
1194
1195         assert(s);
1196         dbus_error_init(&error);
1197
1198         /* We don't take connections anymore if we are supposed to
1199          * shut down anyway */
1200         if (unit_pending_inactive(UNIT(s))) {
1201                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", s->meta.id);
1202
1203                 if (cfd >= 0)
1204                         close_nointr_nofail(cfd);
1205                 else  {
1206                         /* Flush all sockets by closing and reopening them */
1207                         socket_close_fds(s);
1208
1209                         if ((r = socket_watch_fds(s)) < 0) {
1210                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1211                                 socket_enter_stop_pre(s, false);
1212                         }
1213                 }
1214
1215                 return;
1216         }
1217
1218         if (cfd < 0) {
1219                 bool pending = false;
1220                 Meta *i;
1221
1222                 /* If there's already a start pending don't bother to
1223                  * do anything */
1224                 LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
1225                         Service *service = (Service *) i;
1226
1227                         if (!set_get(service->configured_sockets, s))
1228                                 continue;
1229
1230                         if (!unit_pending_active(UNIT(service)))
1231                                 continue;
1232
1233                         pending = true;
1234                         break;
1235                 }
1236
1237                 if (!pending)
1238                         if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1239                                 goto fail;
1240
1241                 socket_set_state(s, SOCKET_RUNNING);
1242         } else {
1243                 char *prefix, *instance = NULL, *name;
1244                 Service *service;
1245
1246                 if (s->n_connections >= s->max_connections) {
1247                         log_warning("Too many incoming connections (%u)", s->n_connections);
1248                         close_nointr_nofail(cfd);
1249                         return;
1250                 }
1251
1252                 if ((r = socket_instantiate_service(s)) < 0)
1253                         goto fail;
1254
1255                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1256                         goto fail;
1257
1258                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1259                         free(instance);
1260                         r = -ENOMEM;
1261                         goto fail;
1262                 }
1263
1264                 name = unit_name_build(prefix, instance, ".service");
1265                 free(prefix);
1266                 free(instance);
1267
1268                 if (!name) {
1269                         r = -ENOMEM;
1270                         goto fail;
1271                 }
1272
1273                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1274                         free(name);
1275                         goto fail;
1276                 }
1277
1278                 service = s->service;
1279                 s->service = NULL;
1280                 s->n_accepted ++;
1281
1282                 service->meta.no_gc = false;
1283
1284                 unit_choose_id(UNIT(service), name);
1285                 free(name);
1286
1287                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1288                         goto fail;
1289
1290                 cfd = -1;
1291                 s->n_connections ++;
1292
1293                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1294                         goto fail;
1295
1296                 /* Notify clients about changed counters */
1297                 unit_add_to_dbus_queue(UNIT(s));
1298         }
1299
1300         return;
1301
1302 fail:
1303         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1304         socket_enter_stop_pre(s, false);
1305
1306         if (cfd >= 0)
1307                 close_nointr_nofail(cfd);
1308
1309         dbus_error_free(&error);
1310 }
1311
1312 static void socket_run_next(Socket *s, bool success) {
1313         int r;
1314
1315         assert(s);
1316         assert(s->control_command);
1317         assert(s->control_command->command_next);
1318
1319         if (!success)
1320                 s->failure = true;
1321
1322         socket_unwatch_control_pid(s);
1323
1324         s->control_command = s->control_command->command_next;
1325
1326         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1327                 goto fail;
1328
1329         return;
1330
1331 fail:
1332         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1333
1334         if (s->state == SOCKET_START_POST)
1335                 socket_enter_stop_pre(s, false);
1336         else if (s->state == SOCKET_STOP_POST)
1337                 socket_enter_dead(s, false);
1338         else
1339                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1340 }
1341
1342 static int socket_start(Unit *u) {
1343         Socket *s = SOCKET(u);
1344
1345         assert(s);
1346
1347         /* We cannot fulfill this request right now, try again later
1348          * please! */
1349         if (s->state == SOCKET_STOP_PRE ||
1350             s->state == SOCKET_STOP_PRE_SIGKILL ||
1351             s->state == SOCKET_STOP_PRE_SIGTERM ||
1352             s->state == SOCKET_STOP_POST ||
1353             s->state == SOCKET_FINAL_SIGTERM ||
1354             s->state == SOCKET_FINAL_SIGKILL)
1355                 return -EAGAIN;
1356
1357         if (s->state == SOCKET_START_PRE ||
1358             s->state == SOCKET_START_POST)
1359                 return 0;
1360
1361         /* Cannot run this without the service being around */
1362         if (s->service) {
1363                 if (s->service->meta.load_state != UNIT_LOADED)
1364                         return -ENOENT;
1365
1366                 /* If the service is already active we cannot start the
1367                  * socket */
1368                 if (s->service->state != SERVICE_DEAD &&
1369                     s->service->state != SERVICE_FAILED &&
1370                     s->service->state != SERVICE_AUTO_RESTART)
1371                         return -EBUSY;
1372
1373 #ifdef HAVE_SYSV_COMPAT
1374                 if (s->service->sysv_path) {
1375                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1376                         return -ENOENT;
1377                 }
1378 #endif
1379         }
1380
1381         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1382
1383         s->failure = false;
1384         socket_enter_start_pre(s);
1385         return 0;
1386 }
1387
1388 static int socket_stop(Unit *u) {
1389         Socket *s = SOCKET(u);
1390
1391         assert(s);
1392
1393         /* Already on it */
1394         if (s->state == SOCKET_STOP_PRE ||
1395             s->state == SOCKET_STOP_PRE_SIGTERM ||
1396             s->state == SOCKET_STOP_PRE_SIGKILL ||
1397             s->state == SOCKET_STOP_POST ||
1398             s->state == SOCKET_FINAL_SIGTERM ||
1399             s->state == SOCKET_FINAL_SIGKILL)
1400                 return 0;
1401
1402         /* If there's already something running we go directly into
1403          * kill mode. */
1404         if (s->state == SOCKET_START_PRE ||
1405             s->state == SOCKET_START_POST) {
1406                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1407                 return -EAGAIN;
1408         }
1409
1410         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1411
1412         socket_enter_stop_pre(s, true);
1413         return 0;
1414 }
1415
1416 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1417         Socket *s = SOCKET(u);
1418         SocketPort *p;
1419         int r;
1420
1421         assert(u);
1422         assert(f);
1423         assert(fds);
1424
1425         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1426         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1427         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1428
1429         if (s->control_pid > 0)
1430                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1431
1432         if (s->control_command_id >= 0)
1433                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1434
1435         LIST_FOREACH(port, p, s->ports) {
1436                 int copy;
1437
1438                 if (p->fd < 0)
1439                         continue;
1440
1441                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1442                         return copy;
1443
1444                 if (p->type == SOCKET_SOCKET) {
1445                         char *t;
1446
1447                         if ((r = socket_address_print(&p->address, &t)) < 0)
1448                                 return r;
1449
1450                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1451                         free(t);
1452                 } else {
1453                         assert(p->type == SOCKET_FIFO);
1454                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1455                 }
1456         }
1457
1458         return 0;
1459 }
1460
1461 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1462         Socket *s = SOCKET(u);
1463
1464         assert(u);
1465         assert(key);
1466         assert(value);
1467         assert(fds);
1468
1469         if (streq(key, "state")) {
1470                 SocketState state;
1471
1472                 if ((state = socket_state_from_string(value)) < 0)
1473                         log_debug("Failed to parse state value %s", value);
1474                 else
1475                         s->deserialized_state = state;
1476         } else if (streq(key, "failure")) {
1477                 int b;
1478
1479                 if ((b = parse_boolean(value)) < 0)
1480                         log_debug("Failed to parse failure value %s", value);
1481                 else
1482                         s->failure = b || s->failure;
1483
1484         } else if (streq(key, "n-accepted")) {
1485                 unsigned k;
1486
1487                 if (safe_atou(value, &k) < 0)
1488                         log_debug("Failed to parse n-accepted value %s", value);
1489                 else
1490                         s->n_accepted += k;
1491         } else if (streq(key, "control-pid")) {
1492                 pid_t pid;
1493
1494                 if (parse_pid(value, &pid) < 0)
1495                         log_debug("Failed to parse control-pid value %s", value);
1496                 else
1497                         s->control_pid = pid;
1498         } else if (streq(key, "control-command")) {
1499                 SocketExecCommand id;
1500
1501                 if ((id = socket_exec_command_from_string(value)) < 0)
1502                         log_debug("Failed to parse exec-command value %s", value);
1503                 else {
1504                         s->control_command_id = id;
1505                         s->control_command = s->exec_command[id];
1506                 }
1507         } else if (streq(key, "fifo")) {
1508                 int fd, skip = 0;
1509                 SocketPort *p;
1510
1511                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1512                         log_debug("Failed to parse fifo value %s", value);
1513                 else {
1514
1515                         LIST_FOREACH(port, p, s->ports)
1516                                 if (streq(p->path, value+skip))
1517                                         break;
1518
1519                         if (p) {
1520                                 if (p->fd >= 0)
1521                                         close_nointr_nofail(p->fd);
1522                                 p->fd = fdset_remove(fds, fd);
1523                         }
1524                 }
1525
1526         } else if (streq(key, "socket")) {
1527                 int fd, type, skip = 0;
1528                 SocketPort *p;
1529
1530                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1531                         log_debug("Failed to parse socket value %s", value);
1532                 else {
1533
1534                         LIST_FOREACH(port, p, s->ports)
1535                                 if (socket_address_is(&p->address, value+skip, type))
1536                                         break;
1537
1538                         if (p) {
1539                                 if (p->fd >= 0)
1540                                         close_nointr_nofail(p->fd);
1541                                 p->fd = fdset_remove(fds, fd);
1542                         }
1543                 }
1544
1545         } else
1546                 log_debug("Unknown serialization key '%s'", key);
1547
1548         return 0;
1549 }
1550
1551 static UnitActiveState socket_active_state(Unit *u) {
1552         assert(u);
1553
1554         return state_translation_table[SOCKET(u)->state];
1555 }
1556
1557 static const char *socket_sub_state_to_string(Unit *u) {
1558         assert(u);
1559
1560         return socket_state_to_string(SOCKET(u)->state);
1561 }
1562
1563 static bool socket_check_gc(Unit *u) {
1564         Socket *s = SOCKET(u);
1565
1566         assert(u);
1567
1568         return s->n_connections > 0;
1569 }
1570
1571 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1572         Socket *s = SOCKET(u);
1573         int cfd = -1;
1574
1575         assert(s);
1576         assert(fd >= 0);
1577
1578         if (s->state != SOCKET_LISTENING)
1579                 return;
1580
1581         log_debug("Incoming traffic on %s", u->meta.id);
1582
1583         if (events != EPOLLIN) {
1584                 log_error("Got invalid poll event on socket.");
1585                 goto fail;
1586         }
1587
1588         if (w->socket_accept) {
1589                 for (;;) {
1590
1591                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1592
1593                                 if (errno == EINTR)
1594                                         continue;
1595
1596                                 log_error("Failed to accept socket: %m");
1597                                 goto fail;
1598                         }
1599
1600                         break;
1601                 }
1602
1603                 socket_apply_socket_options(s, cfd);
1604         }
1605
1606         socket_enter_running(s, cfd);
1607         return;
1608
1609 fail:
1610         socket_enter_stop_pre(s, false);
1611 }
1612
1613 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1614         Socket *s = SOCKET(u);
1615         bool success;
1616
1617         assert(s);
1618         assert(pid >= 0);
1619
1620         if (pid != s->control_pid)
1621                 return;
1622
1623         s->control_pid = 0;
1624
1625         success = is_clean_exit(code, status);
1626
1627         if (s->control_command) {
1628                 exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
1629
1630                 if (s->control_command->ignore)
1631                         success = true;
1632         }
1633
1634         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1635                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1636         s->failure = s->failure || !success;
1637
1638         if (s->control_command && s->control_command->command_next && success) {
1639                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1640                 socket_run_next(s, success);
1641         } else {
1642                 s->control_command = NULL;
1643                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1644
1645                 /* No further commands for this step, so let's figure
1646                  * out what to do next */
1647
1648                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1649
1650                 switch (s->state) {
1651
1652                 case SOCKET_START_PRE:
1653                         if (success)
1654                                 socket_enter_start_post(s);
1655                         else
1656                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1657                         break;
1658
1659                 case SOCKET_START_POST:
1660                         if (success)
1661                                 socket_enter_listening(s);
1662                         else
1663                                 socket_enter_stop_pre(s, false);
1664                         break;
1665
1666                 case SOCKET_STOP_PRE:
1667                 case SOCKET_STOP_PRE_SIGTERM:
1668                 case SOCKET_STOP_PRE_SIGKILL:
1669                         socket_enter_stop_post(s, success);
1670                         break;
1671
1672                 case SOCKET_STOP_POST:
1673                 case SOCKET_FINAL_SIGTERM:
1674                 case SOCKET_FINAL_SIGKILL:
1675                         socket_enter_dead(s, success);
1676                         break;
1677
1678                 default:
1679                         assert_not_reached("Uh, control process died at wrong time.");
1680                 }
1681         }
1682
1683         /* Notify clients about changed exit status */
1684         unit_add_to_dbus_queue(u);
1685 }
1686
1687 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1688         Socket *s = SOCKET(u);
1689
1690         assert(s);
1691         assert(elapsed == 1);
1692         assert(w == &s->timer_watch);
1693
1694         switch (s->state) {
1695
1696         case SOCKET_START_PRE:
1697                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1698                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1699                 break;
1700
1701         case SOCKET_START_POST:
1702                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1703                 socket_enter_stop_pre(s, false);
1704                 break;
1705
1706         case SOCKET_STOP_PRE:
1707                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1708                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1709                 break;
1710
1711         case SOCKET_STOP_PRE_SIGTERM:
1712                 if (s->exec_context.send_sigkill) {
1713                         log_warning("%s stopping timed out. Killing.", u->meta.id);
1714                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1715                 } else {
1716                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1717                         socket_enter_stop_post(s, false);
1718                 }
1719                 break;
1720
1721         case SOCKET_STOP_PRE_SIGKILL:
1722                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1723                 socket_enter_stop_post(s, false);
1724                 break;
1725
1726         case SOCKET_STOP_POST:
1727                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1728                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1729                 break;
1730
1731         case SOCKET_FINAL_SIGTERM:
1732                 if (s->exec_context.send_sigkill) {
1733                         log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1734                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1735                 } else {
1736                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->meta.id);
1737                         socket_enter_dead(s, false);
1738                 }
1739                 break;
1740
1741         case SOCKET_FINAL_SIGKILL:
1742                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
1743                 socket_enter_dead(s, false);
1744                 break;
1745
1746         default:
1747                 assert_not_reached("Timeout at wrong time.");
1748         }
1749 }
1750
1751 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1752         int *rfds;
1753         unsigned rn_fds, k;
1754         SocketPort *p;
1755
1756         assert(s);
1757         assert(fds);
1758         assert(n_fds);
1759
1760         /* Called from the service code for requesting our fds */
1761
1762         rn_fds = 0;
1763         LIST_FOREACH(port, p, s->ports)
1764                 if (p->fd >= 0)
1765                         rn_fds++;
1766
1767         if (!(rfds = new(int, rn_fds)))
1768                 return -ENOMEM;
1769
1770         k = 0;
1771         LIST_FOREACH(port, p, s->ports)
1772                 if (p->fd >= 0)
1773                         rfds[k++] = p->fd;
1774
1775         assert(k == rn_fds);
1776
1777         *fds = rfds;
1778         *n_fds = rn_fds;
1779
1780         return 0;
1781 }
1782
1783 void socket_notify_service_dead(Socket *s) {
1784         assert(s);
1785
1786         /* The service is dead. Dang!
1787          *
1788          * This is strictly for one-instance-for-all-connections
1789          * services. */
1790
1791         if (s->state == SOCKET_RUNNING) {
1792                 log_debug("%s got notified about service death.", s->meta.id);
1793                 socket_enter_listening(s);
1794         }
1795 }
1796
1797 void socket_connection_unref(Socket *s) {
1798         assert(s);
1799
1800         /* The service is dead. Yay!
1801          *
1802          * This is strictly for one-instance-per-connection
1803          * services. */
1804
1805         assert(s->n_connections > 0);
1806         s->n_connections--;
1807
1808         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1809 }
1810
1811 static void socket_reset_failed(Unit *u) {
1812         Socket *s = SOCKET(u);
1813
1814         assert(s);
1815
1816         if (s->state == SOCKET_FAILED)
1817                 socket_set_state(s, SOCKET_DEAD);
1818
1819         s->failure = false;
1820 }
1821
1822 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1823         Socket *s = SOCKET(u);
1824         int r = 0;
1825         Set *pid_set = NULL;
1826
1827         assert(s);
1828
1829         if (who == KILL_MAIN) {
1830                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
1831                 return -EINVAL;
1832         }
1833
1834         if (s->control_pid <= 0 && who == KILL_CONTROL) {
1835                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1836                 return -ENOENT;
1837         }
1838
1839         if (s->control_pid > 0)
1840                 if (kill(s->control_pid, signo) < 0)
1841                         r = -errno;
1842
1843         if (mode == KILL_CONTROL_GROUP) {
1844                 int q;
1845
1846                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1847                         return -ENOMEM;
1848
1849                 /* Exclude the control pid from being killed via the cgroup */
1850                 if (s->control_pid > 0)
1851                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1852                                 r = q;
1853                                 goto finish;
1854                         }
1855
1856                 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1857                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1858                                 r = q;
1859         }
1860
1861 finish:
1862         if (pid_set)
1863                 set_free(pid_set);
1864
1865         return r;
1866 }
1867
1868 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1869         [SOCKET_DEAD] = "dead",
1870         [SOCKET_START_PRE] = "start-pre",
1871         [SOCKET_START_POST] = "start-post",
1872         [SOCKET_LISTENING] = "listening",
1873         [SOCKET_RUNNING] = "running",
1874         [SOCKET_STOP_PRE] = "stop-pre",
1875         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1876         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1877         [SOCKET_STOP_POST] = "stop-post",
1878         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1879         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1880         [SOCKET_FAILED] = "failed"
1881 };
1882
1883 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1884
1885 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1886         [SOCKET_EXEC_START_PRE] = "StartPre",
1887         [SOCKET_EXEC_START_POST] = "StartPost",
1888         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1889         [SOCKET_EXEC_STOP_POST] = "StopPost"
1890 };
1891
1892 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1893
1894 const UnitVTable socket_vtable = {
1895         .suffix = ".socket",
1896
1897         .init = socket_init,
1898         .done = socket_done,
1899         .load = socket_load,
1900
1901         .kill = socket_kill,
1902
1903         .coldplug = socket_coldplug,
1904
1905         .dump = socket_dump,
1906
1907         .start = socket_start,
1908         .stop = socket_stop,
1909
1910         .serialize = socket_serialize,
1911         .deserialize_item = socket_deserialize_item,
1912
1913         .active_state = socket_active_state,
1914         .sub_state_to_string = socket_sub_state_to_string,
1915
1916         .check_gc = socket_check_gc,
1917
1918         .fd_event = socket_fd_event,
1919         .sigchld_event = socket_sigchld_event,
1920         .timer_event = socket_timer_event,
1921
1922         .reset_failed = socket_reset_failed,
1923
1924         .bus_interface = "org.freedesktop.systemd1.Socket",
1925         .bus_message_handler = bus_socket_message_handler,
1926         .bus_invalidating_properties =  bus_socket_invalidating_properties
1927 };