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 && have_non_accept_socket(s)) {
 164                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
 165                 return -EINVAL;
 166         }
 167
 168         if (s->accept && s->max_connections <= 0) {
 169                 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
 170                 return -EINVAL;
 171         }
 172
 173         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 174                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
 175                 return -EINVAL;
 176         }
 177
 178         return 0;
 179 }
 180
 181 static bool socket_needs_mount(Socket *s, const char *prefix) {
 182         SocketPort *p;
 183
 184         assert(s);
 185
 186         LIST_FOREACH(port, p, s->ports) {
 187
 188                 if (p->type == SOCKET_SOCKET) {
 189                         if (socket_address_needs_mount(&p->address, prefix))
 190                                 return true;
 191                 } else {
 192                         assert(p->type == SOCKET_FIFO);
 193                         if (path_startswith(p->path, prefix))
 194                                 return true;
 195                 }
 196         }
 197
 198         return false;
 199 }
 200
 201 int socket_add_one_mount_link(Socket *s, Mount *m) {
 202         int r;
 203
 204         assert(s);
 205         assert(m);
 206
 207         if (s->meta.load_state != UNIT_LOADED ||
 208             m->meta.load_state != UNIT_LOADED)
 209                 return 0;
 210
 211         if (!socket_needs_mount(s, m->where))
 212                 return 0;
 213
 214         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 215                 return r;
 216
 217         return 0;
 218 }
 219
 220 static int socket_add_mount_links(Socket *s) {
 221         Meta *other;
 222         int r;
 223
 224         assert(s);
 225
 226         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 227                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 228                         return r;
 229
 230         return 0;
 231 }
 232
 233 static int socket_add_device_link(Socket *s) {
 234         char *t;
 235         int r;
 236
 237         assert(s);
 238
 239         if (!s->bind_to_device)
 240                 return 0;
 241
 242         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 243                 return -ENOMEM;
 244
 245         r = unit_add_node_link(UNIT(s), t, false);
 246         free(t);
 247
 248         return r;
 249 }
 250
 251 static int socket_add_default_dependencies(Socket *s) {
 252         int r;
 253         assert(s);
 254
 255         if (s->meta.manager->running_as == MANAGER_SYSTEM)
 256                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 257                         return r;
 258
 259         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 260 }
 261
 262 static int socket_load(Unit *u) {
 263         Socket *s = SOCKET(u);
 264         int r;
 265
 266         assert(u);
 267         assert(u->meta.load_state == UNIT_STUB);
 268
 269         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 270                 return r;
 271
 272         /* This is a new unit? Then let's add in some extras */
 273         if (u->meta.load_state == UNIT_LOADED) {
 274
 275                 if (have_non_accept_socket(s)) {
 276                         if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
 277                                 return r;
 278
 279                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 280                                 return r;
 281                 }
 282
 283                 if ((r = socket_add_mount_links(s)) < 0)
 284                         return r;
 285
 286                 if ((r = socket_add_device_link(s)) < 0)
 287                         return r;
 288
 289                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 290                         return r;
 291
 292                 if ((r = unit_add_default_cgroup(u)) < 0)
 293                         return r;
 294
 295                 if (s->meta.default_dependencies)
 296                         if ((r = socket_add_default_dependencies(s)) < 0)
 297                                 return r;
 298         }
 299
 300         return socket_verify(s);
 301 }
 302
 303 static const char* listen_lookup(int type) {
 304
 305         if (type == SOCK_STREAM)
 306                 return "ListenStream";
 307         else if (type == SOCK_DGRAM)
 308                 return "ListenDatagram";
 309         else if (type == SOCK_SEQPACKET)
 310                 return "ListenSequentialPacket";
 311
 312         assert_not_reached("Unknown socket type");
 313         return NULL;
 314 }
 315
 316 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 317
 318         SocketExecCommand c;
 319         Socket *s = SOCKET(u);
 320         SocketPort *p;
 321         const char *prefix2;
 322         char *p2;
 323
 324         assert(s);
 325         assert(f);
 326
 327         p2 = strappend(prefix, "\t");
 328         prefix2 = p2 ? p2 : prefix;
 329
 330         fprintf(f,
 331                 "%sSocket State: %s\n"
 332                 "%sBindIPv6Only: %s\n"
 333                 "%sBacklog: %u\n"
 334                 "%sSocketMode: %04o\n"
 335                 "%sDirectoryMode: %04o\n"
 336                 "%sKeepAlive: %s\n"
 337                 "%sFreeBind: %s\n",
 338                 prefix, socket_state_to_string(s->state),
 339                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 340                 prefix, s->backlog,
 341                 prefix, s->socket_mode,
 342                 prefix, s->directory_mode,
 343                 prefix, yes_no(s->keep_alive),
 344                 prefix, yes_no(s->free_bind));
 345
 346         if (s->control_pid > 0)
 347                 fprintf(f,
 348                         "%sControl PID: %lu\n",
 349                         prefix, (unsigned long) s->control_pid);
 350
 351         if (s->bind_to_device)
 352                 fprintf(f,
 353                         "%sBindToDevice: %s\n",
 354                         prefix, s->bind_to_device);
 355
 356         if (s->accept)
 357                 fprintf(f,
 358                         "%sAccepted: %u\n"
 359                         "%sNConnections: %u\n"
 360                         "%sMaxConnections: %u\n",
 361                         prefix, s->n_accepted,
 362                         prefix, s->n_connections,
 363                         prefix, s->max_connections);
 364
 365         if (s->priority >= 0)
 366                 fprintf(f,
 367                         "%sPriority: %i\n",
 368                         prefix, s->priority);
 369
 370         if (s->receive_buffer > 0)
 371                 fprintf(f,
 372                         "%sReceiveBuffer: %zu\n",
 373                         prefix, s->receive_buffer);
 374
 375         if (s->send_buffer > 0)
 376                 fprintf(f,
 377                         "%sSendBuffer: %zu\n",
 378                         prefix, s->send_buffer);
 379
 380         if (s->ip_tos >= 0)
 381                 fprintf(f,
 382                         "%sIPTOS: %i\n",
 383                         prefix, s->ip_tos);
 384
 385         if (s->ip_ttl >= 0)
 386                 fprintf(f,
 387                         "%sIPTTL: %i\n",
 388                         prefix, s->ip_ttl);
 389
 390         if (s->pipe_size > 0)
 391                 fprintf(f,
 392                         "%sPipeSize: %zu\n",
 393                         prefix, s->pipe_size);
 394
 395         if (s->mark >= 0)
 396                 fprintf(f,
 397                         "%sMark: %i\n",
 398                         prefix, s->mark);
 399
 400         LIST_FOREACH(port, p, s->ports) {
 401
 402                 if (p->type == SOCKET_SOCKET) {
 403                         const char *t;
 404                         int r;
 405                         char *k;
 406
 407                         if ((r = socket_address_print(&p->address, &k)) < 0)
 408                                 t = strerror(-r);
 409                         else
 410                                 t = k;
 411
 412                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 413                         free(k);
 414                 } else
 415                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 416         }
 417
 418         exec_context_dump(&s->exec_context, f, prefix);
 419
 420         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 421                 if (!s->exec_command[c])
 422                         continue;
 423
 424                 fprintf(f, "%s-> %s:\n",
 425                         prefix, socket_exec_command_to_string(c));
 426
 427                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 428         }
 429
 430         free(p2);
 431 }
 432
 433 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 434         socklen_t l;
 435         char *r;
 436         union {
 437                 struct sockaddr sa;
 438                 struct sockaddr_un un;
 439                 struct sockaddr_in in;
 440                 struct sockaddr_in6 in6;
 441                 struct sockaddr_storage storage;
 442         } local, remote;
 443
 444         assert(fd >= 0);
 445         assert(instance);
 446
 447         l = sizeof(local);
 448         if (getsockname(fd, &local.sa, &l) < 0)
 449                 return -errno;
 450
 451         l = sizeof(remote);
 452         if (getpeername(fd, &remote.sa, &l) < 0)
 453                 return -errno;
 454
 455         switch (local.sa.sa_family) {
 456
 457         case AF_INET: {
 458                 uint32_t
 459                         a = ntohl(local.in.sin_addr.s_addr),
 460                         b = ntohl(remote.in.sin_addr.s_addr);
 461
 462                 if (asprintf(&r,
 463                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 464                              nr,
 465                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 466                              ntohs(local.in.sin_port),
 467                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 468                              ntohs(remote.in.sin_port)) < 0)
 469                         return -ENOMEM;
 470
 471                 break;
 472         }
 473
 474         case AF_INET6: {
 475                 static const char ipv4_prefix[] = {
 476                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 477                 };
 478
 479                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 480                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 481                         const uint8_t
 482                                 *a = local.in6.sin6_addr.s6_addr+12,
 483                                 *b = remote.in6.sin6_addr.s6_addr+12;
 484
 485                         if (asprintf(&r,
 486                                      "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 487                                      nr,
 488                                      a[0], a[1], a[2], a[3],
 489                                      ntohs(local.in6.sin6_port),
 490                                      b[0], b[1], b[2], b[3],
 491                                      ntohs(remote.in6.sin6_port)) < 0)
 492                                 return -ENOMEM;
 493                 } else {
 494                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 495
 496                         if (asprintf(&r,
 497                                      "%u-%s:%u-%s:%u",
 498                                      nr,
 499                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 500                                      ntohs(local.in6.sin6_port),
 501                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 502                                      ntohs(remote.in6.sin6_port)) < 0)
 503                                 return -ENOMEM;
 504                 }
 505
 506                 break;
 507         }
 508
 509         case AF_UNIX: {
 510                 struct ucred ucred;
 511
 512                 l = sizeof(ucred);
 513                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 514                         return -errno;
 515
 516                 if (asprintf(&r,
 517                              "%u-%lu-%lu",
 518                              nr,
 519                              (unsigned long) ucred.pid,
 520                              (unsigned long) ucred.uid) < 0)
 521                         return -ENOMEM;
 522
 523                 break;
 524         }
 525
 526         default:
 527                 assert_not_reached("Unhandled socket type.");
 528         }
 529
 530         *instance = r;
 531         return 0;
 532 }
 533
 534 static void socket_close_fds(Socket *s) {
 535         SocketPort *p;
 536
 537         assert(s);
 538
 539         LIST_FOREACH(port, p, s->ports) {
 540                 if (p->fd < 0)
 541                         continue;
 542
 543                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 544                 close_nointr_nofail(p->fd);
 545
 546                 /* One little note: we should never delete any sockets
 547                  * in the file system here! After all some other
 548                  * process we spawned might still have a reference of
 549                  * this fd and wants to continue to use it. Therefore
 550                  * we delete sockets in the file system before we
 551                  * create a new one, not after we stopped using
 552                  * one! */
 553
 554                 p->fd = -1;
 555         }
 556 }
 557
 558 static void socket_apply_socket_options(Socket *s, int fd) {
 559         assert(s);
 560         assert(fd >= 0);
 561
 562         if (s->keep_alive) {
 563                 int b = s->keep_alive;
 564                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 565                         log_warning("SO_KEEPALIVE failed: %m");
 566         }
 567
 568         if (s->priority >= 0)
 569                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 570                         log_warning("SO_PRIORITY failed: %m");
 571
 572         if (s->receive_buffer > 0) {
 573                 int value = (int) s->receive_buffer;
 574                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 575                         log_warning("SO_RCVBUF failed: %m");
 576         }
 577
 578         if (s->send_buffer > 0) {
 579                 int value = (int) s->send_buffer;
 580                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 581                         log_warning("SO_SNDBUF failed: %m");
 582         }
 583
 584         if (s->mark >= 0)
 585                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 586                         log_warning("SO_MARK failed: %m");
 587
 588         if (s->ip_tos >= 0)
 589                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 590                         log_warning("IP_TOS failed: %m");
 591
 592         if (s->ip_ttl >= 0) {
 593                 int r, x;
 594
 595                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 596                 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 597
 598                 if (r < 0 && x < 0)
 599                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 600         }
 601 }
 602
 603 static void socket_apply_pipe_options(Socket *s, int fd) {
 604         assert(s);
 605         assert(fd >= 0);
 606
 607         if (s->pipe_size > 0)
 608                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 609                         log_warning("F_SETPIPE_SZ: %m");
 610 }
 611
 612 static int socket_open_fds(Socket *s) {
 613         SocketPort *p;
 614         int r;
 615
 616         assert(s);
 617
 618         LIST_FOREACH(port, p, s->ports) {
 619
 620                 if (p->fd >= 0)
 621                         continue;
 622
 623                 if (p->type == SOCKET_SOCKET) {
 624
 625                         if ((r = socket_address_listen(
 626                                              &p->address,
 627                                              s->backlog,
 628                                              s->bind_ipv6_only,
 629                                              s->bind_to_device,
 630                                              s->free_bind,
 631                                              s->directory_mode,
 632                                              s->socket_mode,
 633                                              &p->fd)) < 0)
 634                                 goto rollback;
 635
 636                         socket_apply_socket_options(s, p->fd);
 637
 638                 } else {
 639                         struct stat st;
 640                         assert(p->type == SOCKET_FIFO);
 641
 642                         mkdir_parents(p->path, s->directory_mode);
 643
 644                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 645                                 r = -errno;
 646                                 goto rollback;
 647                         }
 648
 649                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 650                                 r = -errno;
 651                                 goto rollback;
 652                         }
 653
 654                         if (fstat(p->fd, &st) < 0) {
 655                                 r = -errno;
 656                                 goto rollback;
 657                         }
 658
 659                         /* FIXME verify user, access mode */
 660
 661                         if (!S_ISFIFO(st.st_mode)) {
 662                                 r = -EEXIST;
 663                                 goto rollback;
 664                         }
 665
 666                         socket_apply_pipe_options(s, p->fd);
 667                 }
 668         }
 669
 670         return 0;
 671
 672 rollback:
 673         socket_close_fds(s);
 674         return r;
 675 }
 676
 677 static void socket_unwatch_fds(Socket *s) {
 678         SocketPort *p;
 679
 680         assert(s);
 681
 682         LIST_FOREACH(port, p, s->ports) {
 683                 if (p->fd < 0)
 684                         continue;
 685
 686                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 687         }
 688 }
 689
 690 static int socket_watch_fds(Socket *s) {
 691         SocketPort *p;
 692         int r;
 693
 694         assert(s);
 695
 696         LIST_FOREACH(port, p, s->ports) {
 697                 if (p->fd < 0)
 698                         continue;
 699
 700                 p->fd_watch.socket_accept =
 701                         s->accept &&
 702                         p->type == SOCKET_SOCKET &&
 703                         socket_address_can_accept(&p->address);
 704
 705                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 706                         goto fail;
 707         }
 708
 709         return 0;
 710
 711 fail:
 712         socket_unwatch_fds(s);
 713         return r;
 714 }
 715
 716 static void socket_set_state(Socket *s, SocketState state) {
 717         SocketState old_state;
 718         assert(s);
 719
 720         old_state = s->state;
 721         s->state = state;
 722
 723         if (state != SOCKET_START_PRE &&
 724             state != SOCKET_START_POST &&
 725             state != SOCKET_STOP_PRE &&
 726             state != SOCKET_STOP_PRE_SIGTERM &&
 727             state != SOCKET_STOP_PRE_SIGKILL &&
 728             state != SOCKET_STOP_POST &&
 729             state != SOCKET_FINAL_SIGTERM &&
 730             state != SOCKET_FINAL_SIGKILL) {
 731                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 732                 socket_unwatch_control_pid(s);
 733                 s->control_command = NULL;
 734                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 735         }
 736
 737         if (state != SOCKET_LISTENING)
 738                 socket_unwatch_fds(s);
 739
 740         if (state != SOCKET_START_POST &&
 741             state != SOCKET_LISTENING &&
 742             state != SOCKET_RUNNING &&
 743             state != SOCKET_STOP_PRE &&
 744             state != SOCKET_STOP_PRE_SIGTERM &&
 745             state != SOCKET_STOP_PRE_SIGKILL)
 746                 socket_close_fds(s);
 747
 748         if (state != old_state)
 749                 log_debug("%s changed %s -> %s",
 750                           s->meta.id,
 751                           socket_state_to_string(old_state),
 752                           socket_state_to_string(state));
 753
 754         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 755 }
 756
 757 static int socket_coldplug(Unit *u) {
 758         Socket *s = SOCKET(u);
 759         int r;
 760
 761         assert(s);
 762         assert(s->state == SOCKET_DEAD);
 763
 764         if (s->deserialized_state != s->state) {
 765
 766                 if (s->deserialized_state == SOCKET_START_PRE ||
 767                     s->deserialized_state == SOCKET_START_POST ||
 768                     s->deserialized_state == SOCKET_STOP_PRE ||
 769                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 770                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 771                     s->deserialized_state == SOCKET_STOP_POST ||
 772                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 773                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 774
 775                         if (s->control_pid <= 0)
 776                                 return -EBADMSG;
 777
 778                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 779                                 return r;
 780
 781                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 782                                 return r;
 783                 }
 784
 785                 if (s->deserialized_state == SOCKET_START_POST ||
 786                     s->deserialized_state == SOCKET_LISTENING ||
 787                     s->deserialized_state == SOCKET_RUNNING ||
 788                     s->deserialized_state == SOCKET_STOP_PRE ||
 789                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 790                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 791                         if ((r = socket_open_fds(s)) < 0)
 792                                 return r;
 793
 794                 if (s->deserialized_state == SOCKET_LISTENING)
 795                         if ((r = socket_watch_fds(s)) < 0)
 796                                 return r;
 797
 798                 socket_set_state(s, s->deserialized_state);
 799         }
 800
 801         return 0;
 802 }
 803
 804 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 805         pid_t pid;
 806         int r;
 807         char **argv;
 808
 809         assert(s);
 810         assert(c);
 811         assert(_pid);
 812
 813         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 814                 goto fail;
 815
 816         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 817                 r = -ENOMEM;
 818                 goto fail;
 819         }
 820
 821         r = exec_spawn(c,
 822                        argv,
 823                        &s->exec_context,
 824                        NULL, 0,
 825                        s->meta.manager->environment,
 826                        true,
 827                        true,
 828                        true,
 829                        s->meta.manager->confirm_spawn,
 830                        s->meta.cgroup_bondings,
 831                        &pid);
 832
 833         strv_free(argv);
 834         if (r < 0)
 835                 goto fail;
 836
 837         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 838                 /* FIXME: we need to do something here */
 839                 goto fail;
 840
 841         *_pid = pid;
 842
 843         return 0;
 844
 845 fail:
 846         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 847
 848         return r;
 849 }
 850
 851 static void socket_enter_dead(Socket *s, bool success) {
 852         assert(s);
 853
 854         if (!success)
 855                 s->failure = true;
 856
 857         socket_set_state(s, s->failure ? SOCKET_MAINTENANCE : SOCKET_DEAD);
 858 }
 859
 860 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 861
 862 static void socket_enter_stop_post(Socket *s, bool success) {
 863         int r;
 864         assert(s);
 865
 866         if (!success)
 867                 s->failure = true;
 868
 869         socket_unwatch_control_pid(s);
 870
 871         s->control_command_id = SOCKET_EXEC_STOP_POST;
 872
 873         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 874                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 875                         goto fail;
 876
 877                 socket_set_state(s, SOCKET_STOP_POST);
 878         } else
 879                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
 880
 881         return;
 882
 883 fail:
 884         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
 885         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 886 }
 887
 888 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 889         int r;
 890         bool sent = false;
 891
 892         assert(s);
 893
 894         if (!success)
 895                 s->failure = true;
 896
 897         if (s->exec_context.kill_mode != KILL_NONE) {
 898                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
 899
 900                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 901
 902                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
 903                                 if (r != -EAGAIN && r != -ESRCH)
 904                                         goto fail;
 905                         } else
 906                                 sent = true;
 907                 }
 908
 909                 if (!sent && s->control_pid > 0)
 910                         if (kill(s->exec_context.kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 911                                 r = -errno;
 912                                 goto fail;
 913                         }
 914         }
 915
 916         if (sent && s->control_pid > 0) {
 917                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 918                         goto fail;
 919
 920                 socket_set_state(s, state);
 921         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 922                 socket_enter_stop_post(s, true);
 923         else
 924                 socket_enter_dead(s, true);
 925
 926         return;
 927
 928 fail:
 929         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
 930
 931         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 932                 socket_enter_stop_post(s, false);
 933         else
 934                 socket_enter_dead(s, false);
 935 }
 936
 937 static void socket_enter_stop_pre(Socket *s, bool success) {
 938         int r;
 939         assert(s);
 940
 941         if (!success)
 942                 s->failure = true;
 943
 944         socket_unwatch_control_pid(s);
 945
 946         s->control_command_id = SOCKET_EXEC_STOP_PRE;
 947
 948         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
 949                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 950                         goto fail;
 951
 952                 socket_set_state(s, SOCKET_STOP_PRE);
 953         } else
 954                 socket_enter_stop_post(s, true);
 955
 956         return;
 957
 958 fail:
 959         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
 960         socket_enter_stop_post(s, false);
 961 }
 962
 963 static void socket_enter_listening(Socket *s) {
 964         int r;
 965         assert(s);
 966
 967         if ((r = socket_watch_fds(s)) < 0) {
 968                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
 969                 goto fail;
 970         }
 971
 972         socket_set_state(s, SOCKET_LISTENING);
 973         return;
 974
 975 fail:
 976         socket_enter_stop_pre(s, false);
 977 }
 978
 979 static void socket_enter_start_post(Socket *s) {
 980         int r;
 981         assert(s);
 982
 983         if ((r = socket_open_fds(s)) < 0) {
 984                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
 985                 goto fail;
 986         }
 987
 988         socket_unwatch_control_pid(s);
 989
 990         s->control_command_id = SOCKET_EXEC_START_POST;
 991
 992         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
 993                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
 994                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
 995                         goto fail;
 996                 }
 997
 998                 socket_set_state(s, SOCKET_START_POST);
 999         } else
1000                 socket_enter_listening(s);
1001
1002         return;
1003
1004 fail:
1005         socket_enter_stop_pre(s, false);
1006 }
1007
1008 static void socket_enter_start_pre(Socket *s) {
1009         int r;
1010         assert(s);
1011
1012         socket_unwatch_control_pid(s);
1013
1014         s->control_command_id = SOCKET_EXEC_START_PRE;
1015
1016         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1017                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1018                         goto fail;
1019
1020                 socket_set_state(s, SOCKET_START_PRE);
1021         } else
1022                 socket_enter_start_post(s);
1023
1024         return;
1025
1026 fail:
1027         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1028         socket_enter_dead(s, false);
1029 }
1030
1031 static void socket_enter_running(Socket *s, int cfd) {
1032         int r;
1033         DBusError error;
1034
1035         assert(s);
1036         dbus_error_init(&error);
1037
1038         /* We don't take connections anymore if we are supposed to
1039          * shut down anyway */
1040         if (s->meta.job && s->meta.job->type == JOB_STOP) {
1041                 if (cfd >= 0)
1042                         close_nointr_nofail(cfd);
1043                 else  {
1044                         /* Flush all sockets by closing and reopening them */
1045                         socket_close_fds(s);
1046
1047                         if ((r = socket_watch_fds(s)) < 0) {
1048                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1049                                 socket_enter_stop_pre(s, false);
1050                         }
1051                 }
1052
1053                 return;
1054         }
1055
1056         if (cfd < 0) {
1057                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1058                         goto fail;
1059
1060                 socket_set_state(s, SOCKET_RUNNING);
1061         } else {
1062                 Unit *u;
1063                 char *prefix, *instance = NULL, *name;
1064
1065                 if (s->n_connections >= s->max_connections) {
1066                         log_warning("Too many incoming connections (%u)", s->n_connections);
1067                         close_nointr_nofail(cfd);
1068                         return;
1069                 }
1070
1071                 if ((r = instance_from_socket(cfd, s->n_accepted++, &instance)) < 0)
1072                         goto fail;
1073
1074                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1075                         free(instance);
1076                         r = -ENOMEM;
1077                         goto fail;
1078                 }
1079
1080                 name = unit_name_build(prefix, instance, ".service");
1081                 free(prefix);
1082                 free(instance);
1083
1084                 if (!name) {
1085                         r = -ENOMEM;
1086                         goto fail;
1087                 }
1088
1089                 r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
1090                 free(name);
1091
1092                 if (r < 0)
1093                         goto fail;
1094
1095                 if ((r = service_set_socket_fd(SERVICE(u), cfd, s)) < 0)
1096                         goto fail;
1097
1098                 cfd = -1;
1099
1100                 s->n_connections ++;
1101
1102                 if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, &error, NULL)) < 0)
1103                         goto fail;
1104         }
1105
1106         return;
1107
1108 fail:
1109         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1110         socket_enter_stop_pre(s, false);
1111
1112         if (cfd >= 0)
1113                 close_nointr_nofail(cfd);
1114
1115         dbus_error_free(&error);
1116 }
1117
1118 static void socket_run_next(Socket *s, bool success) {
1119         int r;
1120
1121         assert(s);
1122         assert(s->control_command);
1123         assert(s->control_command->command_next);
1124
1125         if (!success)
1126                 s->failure = true;
1127
1128         socket_unwatch_control_pid(s);
1129
1130         s->control_command = s->control_command->command_next;
1131
1132         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1133                 goto fail;
1134
1135         return;
1136
1137 fail:
1138         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1139
1140         if (s->state == SOCKET_START_POST)
1141                 socket_enter_stop_pre(s, false);
1142         else if (s->state == SOCKET_STOP_POST)
1143                 socket_enter_dead(s, false);
1144         else
1145                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1146 }
1147
1148 static int socket_start(Unit *u) {
1149         Socket *s = SOCKET(u);
1150
1151         assert(s);
1152
1153         /* We cannot fulfill this request right now, try again later
1154          * please! */
1155         if (s->state == SOCKET_STOP_PRE ||
1156             s->state == SOCKET_STOP_PRE_SIGKILL ||
1157             s->state == SOCKET_STOP_PRE_SIGTERM ||
1158             s->state == SOCKET_STOP_POST ||
1159             s->state == SOCKET_FINAL_SIGTERM ||
1160             s->state == SOCKET_FINAL_SIGKILL)
1161                 return -EAGAIN;
1162
1163         if (s->state == SOCKET_START_PRE ||
1164             s->state == SOCKET_START_POST)
1165                 return 0;
1166
1167         /* Cannot run this without the service being around */
1168         if (s->service) {
1169                 if (s->service->meta.load_state != UNIT_LOADED)
1170                         return -ENOENT;
1171
1172                 /* If the service is alredy actvie we cannot start the
1173                  * socket */
1174                 if (s->service->state != SERVICE_DEAD &&
1175                     s->service->state != SERVICE_MAINTENANCE &&
1176                     s->service->state != SERVICE_AUTO_RESTART)
1177                         return -EBUSY;
1178         }
1179
1180         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTENANCE);
1181
1182         s->failure = false;
1183         socket_enter_start_pre(s);
1184         return 0;
1185 }
1186
1187 static int socket_stop(Unit *u) {
1188         Socket *s = SOCKET(u);
1189
1190         assert(s);
1191
1192         /* Already on it */
1193         if (s->state == SOCKET_STOP_PRE ||
1194             s->state == SOCKET_STOP_PRE_SIGTERM ||
1195             s->state == SOCKET_STOP_PRE_SIGKILL ||
1196             s->state == SOCKET_STOP_POST ||
1197             s->state == SOCKET_FINAL_SIGTERM ||
1198             s->state == SOCKET_FINAL_SIGKILL)
1199                 return 0;
1200
1201         /* If there's already something running we go directly into
1202          * kill mode. */
1203         if (s->state == SOCKET_START_PRE ||
1204             s->state == SOCKET_START_POST) {
1205                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1206                 return -EAGAIN;
1207         }
1208
1209         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1210
1211         socket_enter_stop_pre(s, true);
1212         return 0;
1213 }
1214
1215 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1216         Socket *s = SOCKET(u);
1217         SocketPort *p;
1218         int r;
1219
1220         assert(u);
1221         assert(f);
1222         assert(fds);
1223
1224         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1225         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1226         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1227
1228         if (s->control_pid > 0)
1229                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1230
1231         if (s->control_command_id >= 0)
1232                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1233
1234         LIST_FOREACH(port, p, s->ports) {
1235                 int copy;
1236
1237                 if (p->fd < 0)
1238                         continue;
1239
1240                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1241                         return copy;
1242
1243                 if (p->type == SOCKET_SOCKET) {
1244                         char *t;
1245
1246                         if ((r = socket_address_print(&p->address, &t)) < 0)
1247                                 return r;
1248
1249                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1250                         free(t);
1251                 } else {
1252                         assert(p->type == SOCKET_FIFO);
1253                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1254                 }
1255         }
1256
1257         return 0;
1258 }
1259
1260 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1261         Socket *s = SOCKET(u);
1262         int r;
1263
1264         assert(u);
1265         assert(key);
1266         assert(value);
1267         assert(fds);
1268
1269         if (streq(key, "state")) {
1270                 SocketState state;
1271
1272                 if ((state = socket_state_from_string(value)) < 0)
1273                         log_debug("Failed to parse state value %s", value);
1274                 else
1275                         s->deserialized_state = state;
1276         } else if (streq(key, "failure")) {
1277                 int b;
1278
1279                 if ((b = parse_boolean(value)) < 0)
1280                         log_debug("Failed to parse failure value %s", value);
1281                 else
1282                         s->failure = b || s->failure;
1283
1284         } else if (streq(key, "n-accepted")) {
1285                 unsigned k;
1286
1287                 if ((r = safe_atou(value, &k)) < 0)
1288                         log_debug("Failed to parse n-accepted value %s", value);
1289                 else
1290                         s->n_accepted += k;
1291         } else if (streq(key, "control-pid")) {
1292                 pid_t pid;
1293
1294                 if ((r = parse_pid(value, &pid)) < 0)
1295                         log_debug("Failed to parse control-pid value %s", value);
1296                 else
1297                         s->control_pid = pid;
1298         } else if (streq(key, "control-command")) {
1299                 SocketExecCommand id;
1300
1301                 if ((id = socket_exec_command_from_string(value)) < 0)
1302                         log_debug("Failed to parse exec-command value %s", value);
1303                 else {
1304                         s->control_command_id = id;
1305                         s->control_command = s->exec_command[id];
1306                 }
1307         } else if (streq(key, "fifo")) {
1308                 int fd, skip = 0;
1309                 SocketPort *p;
1310
1311                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1312                         log_debug("Failed to parse fifo value %s", value);
1313                 else {
1314
1315                         LIST_FOREACH(port, p, s->ports)
1316                                 if (streq(p->path, value+skip))
1317                                         break;
1318
1319                         if (p) {
1320                                 if (p->fd >= 0)
1321                                         close_nointr_nofail(p->fd);
1322                                 p->fd = fdset_remove(fds, fd);
1323                         }
1324                 }
1325
1326         } else if (streq(key, "socket")) {
1327                 int fd, type, skip = 0;
1328                 SocketPort *p;
1329
1330                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1331                         log_debug("Failed to parse socket value %s", value);
1332                 else {
1333
1334                         LIST_FOREACH(port, p, s->ports)
1335                                 if (socket_address_is(&p->address, value+skip, type))
1336                                         break;
1337
1338                         if (p) {
1339                                 if (p->fd >= 0)
1340                                         close_nointr_nofail(p->fd);
1341                                 p->fd = fdset_remove(fds, fd);
1342                         }
1343                 }
1344
1345         } else
1346                 log_debug("Unknown serialization key '%s'", key);
1347
1348         return 0;
1349 }
1350
1351 static UnitActiveState socket_active_state(Unit *u) {
1352         assert(u);
1353
1354         return state_translation_table[SOCKET(u)->state];
1355 }
1356
1357 static const char *socket_sub_state_to_string(Unit *u) {
1358         assert(u);
1359
1360         return socket_state_to_string(SOCKET(u)->state);
1361 }
1362
1363 static bool socket_check_gc(Unit *u) {
1364         Socket *s = SOCKET(u);
1365
1366         assert(u);
1367
1368         return s->n_connections > 0;
1369 }
1370
1371 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1372         Socket *s = SOCKET(u);
1373         int cfd = -1;
1374
1375         assert(s);
1376         assert(fd >= 0);
1377
1378         if (s->state != SOCKET_LISTENING)
1379                 return;
1380
1381         log_debug("Incoming traffic on %s", u->meta.id);
1382
1383         if (events != EPOLLIN) {
1384                 log_error("Got invalid poll event on socket.");
1385                 goto fail;
1386         }
1387
1388         if (w->socket_accept) {
1389                 for (;;) {
1390
1391                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1392
1393                                 if (errno == EINTR)
1394                                         continue;
1395
1396                                 log_error("Failed to accept socket: %m");
1397                                 goto fail;
1398                         }
1399
1400                         break;
1401                 }
1402
1403                 socket_apply_socket_options(s, cfd);
1404         }
1405
1406         socket_enter_running(s, cfd);
1407         return;
1408
1409 fail:
1410         socket_enter_stop_pre(s, false);
1411 }
1412
1413 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1414         Socket *s = SOCKET(u);
1415         bool success;
1416
1417         assert(s);
1418         assert(pid >= 0);
1419
1420         if (pid != s->control_pid)
1421                 return;
1422
1423         s->control_pid = 0;
1424
1425         success = is_clean_exit(code, status);
1426
1427         if (s->control_command) {
1428                 exec_status_exit(&s->control_command->exec_status, pid, code, status);
1429
1430                 if (s->control_command->ignore)
1431                         success = true;
1432         }
1433
1434         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1435         s->failure = s->failure || !success;
1436
1437         if (s->control_command && s->control_command->command_next && success) {
1438                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1439                 socket_run_next(s, success);
1440         } else {
1441                 s->control_command = NULL;
1442                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1443
1444                 /* No further commands for this step, so let's figure
1445                  * out what to do next */
1446
1447                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1448
1449                 switch (s->state) {
1450
1451                 case SOCKET_START_PRE:
1452                         if (success)
1453                                 socket_enter_start_post(s);
1454                         else
1455                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1456                         break;
1457
1458                 case SOCKET_START_POST:
1459                         if (success)
1460                                 socket_enter_listening(s);
1461                         else
1462                                 socket_enter_stop_pre(s, false);
1463                         break;
1464
1465                 case SOCKET_STOP_PRE:
1466                 case SOCKET_STOP_PRE_SIGTERM:
1467                 case SOCKET_STOP_PRE_SIGKILL:
1468                         socket_enter_stop_post(s, success);
1469                         break;
1470
1471                 case SOCKET_STOP_POST:
1472                 case SOCKET_FINAL_SIGTERM:
1473                 case SOCKET_FINAL_SIGKILL:
1474                         socket_enter_dead(s, success);
1475                         break;
1476
1477                 default:
1478                         assert_not_reached("Uh, control process died at wrong time.");
1479                 }
1480         }
1481 }
1482
1483 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1484         Socket *s = SOCKET(u);
1485
1486         assert(s);
1487         assert(elapsed == 1);
1488         assert(w == &s->timer_watch);
1489
1490         switch (s->state) {
1491
1492         case SOCKET_START_PRE:
1493                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1494                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1495
1496         case SOCKET_START_POST:
1497                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1498                 socket_enter_stop_pre(s, false);
1499                 break;
1500
1501         case SOCKET_STOP_PRE:
1502                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1503                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1504                 break;
1505
1506         case SOCKET_STOP_PRE_SIGTERM:
1507                 log_warning("%s stopping timed out. Killing.", u->meta.id);
1508                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1509                 break;
1510
1511         case SOCKET_STOP_PRE_SIGKILL:
1512                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1513                 socket_enter_stop_post(s, false);
1514                 break;
1515
1516         case SOCKET_STOP_POST:
1517                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1518                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1519                 break;
1520
1521         case SOCKET_FINAL_SIGTERM:
1522                 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1523                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1524                 break;
1525
1526         case SOCKET_FINAL_SIGKILL:
1527                 log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
1528                 socket_enter_dead(s, false);
1529                 break;
1530
1531         default:
1532                 assert_not_reached("Timeout at wrong time.");
1533         }
1534 }
1535
1536 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1537         int *rfds;
1538         unsigned rn_fds, k;
1539         SocketPort *p;
1540
1541         assert(s);
1542         assert(fds);
1543         assert(n_fds);
1544
1545         /* Called from the service code for requesting our fds */
1546
1547         rn_fds = 0;
1548         LIST_FOREACH(port, p, s->ports)
1549                 if (p->fd >= 0)
1550                         rn_fds++;
1551
1552         if (!(rfds = new(int, rn_fds)) < 0)
1553                 return -ENOMEM;
1554
1555         k = 0;
1556         LIST_FOREACH(port, p, s->ports)
1557                 if (p->fd >= 0)
1558                         rfds[k++] = p->fd;
1559
1560         assert(k == rn_fds);
1561
1562         *fds = rfds;
1563         *n_fds = rn_fds;
1564
1565         return 0;
1566 }
1567
1568 void socket_notify_service_dead(Socket *s) {
1569         assert(s);
1570
1571         /* The service is dead. Dang!
1572          *
1573          * This is strictly for one-instance-for-all-connections
1574          * services. */
1575
1576         if (s->state == SOCKET_RUNNING) {
1577                 log_debug("%s got notified about service death.", s->meta.id);
1578                 socket_enter_listening(s);
1579         }
1580 }
1581
1582 void socket_connection_unref(Socket *s) {
1583         assert(s);
1584
1585         /* The service is dead. Yay!
1586          *
1587          * This is strictly for one-onstance-per-connection
1588          * services. */
1589
1590         assert(s->n_connections > 0);
1591         s->n_connections--;
1592
1593         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1594 }
1595
1596 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1597         [SOCKET_DEAD] = "dead",
1598         [SOCKET_START_PRE] = "start-pre",
1599         [SOCKET_START_POST] = "start-post",
1600         [SOCKET_LISTENING] = "listening",
1601         [SOCKET_RUNNING] = "running",
1602         [SOCKET_STOP_PRE] = "stop-pre",
1603         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1604         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1605         [SOCKET_STOP_POST] = "stop-post",
1606         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1607         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1608         [SOCKET_MAINTENANCE] = "maintenance"
1609 };
1610
1611 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1612
1613 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1614         [SOCKET_EXEC_START_PRE] = "StartPre",
1615         [SOCKET_EXEC_START_POST] = "StartPost",
1616         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1617         [SOCKET_EXEC_STOP_POST] = "StopPost"
1618 };
1619
1620 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1621
1622 const UnitVTable socket_vtable = {
1623         .suffix = ".socket",
1624
1625         .init = socket_init,
1626         .done = socket_done,
1627         .load = socket_load,
1628
1629         .coldplug = socket_coldplug,
1630
1631         .dump = socket_dump,
1632
1633         .start = socket_start,
1634         .stop = socket_stop,
1635
1636         .serialize = socket_serialize,
1637         .deserialize_item = socket_deserialize_item,
1638
1639         .active_state = socket_active_state,
1640         .sub_state_to_string = socket_sub_state_to_string,
1641
1642         .check_gc = socket_check_gc,
1643
1644         .fd_event = socket_fd_event,
1645         .sigchld_event = socket_sigchld_event,
1646         .timer_event = socket_timer_event,
1647
1648         .bus_message_handler = bus_socket_message_handler
1649 };