src/socket.c

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