src/socket.c

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