src/core/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 #include <mqueue.h>
  31
  32 #include "unit.h"
  33 #include "socket.h"
  34 #include "netinet/tcp.h"
  35 #include "log.h"
  36 #include "load-dropin.h"
  37 #include "load-fragment.h"
  38 #include "strv.h"
  39 #include "mkdir.h"
  40 #include "unit-name.h"
  41 #include "dbus-socket.h"
  42 #include "missing.h"
  43 #include "special.h"
  44 #include "bus-errors.h"
  45 #include "label.h"
  46 #include "exit-status.h"
  47 #include "def.h"
  48
  49 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  50         [SOCKET_DEAD] = UNIT_INACTIVE,
  51         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  52         [SOCKET_START_POST] = UNIT_ACTIVATING,
  53         [SOCKET_LISTENING] = UNIT_ACTIVE,
  54         [SOCKET_RUNNING] = UNIT_ACTIVE,
  55         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  56         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  57         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  58         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  59         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  60         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  61         [SOCKET_FAILED] = UNIT_FAILED
  62 };
  63
  64 static void socket_init(Unit *u) {
  65         Socket *s = SOCKET(u);
  66
  67         assert(u);
  68         assert(u->load_state == UNIT_STUB);
  69
  70         s->backlog = SOMAXCONN;
  71         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  72         s->directory_mode = 0755;
  73         s->socket_mode = 0666;
  74
  75         s->max_connections = 64;
  76
  77         s->priority = -1;
  78         s->ip_tos = -1;
  79         s->ip_ttl = -1;
  80         s->mark = -1;
  81
  82         exec_context_init(&s->exec_context);
  83         s->exec_context.std_output = u->manager->default_std_output;
  84         s->exec_context.std_error = u->manager->default_std_error;
  85
  86         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  87 }
  88
  89 static void socket_unwatch_control_pid(Socket *s) {
  90         assert(s);
  91
  92         if (s->control_pid <= 0)
  93                 return;
  94
  95         unit_unwatch_pid(UNIT(s), s->control_pid);
  96         s->control_pid = 0;
  97 }
  98
  99 static void socket_done(Unit *u) {
 100         Socket *s = SOCKET(u);
 101         SocketPort *p;
 102
 103         assert(s);
 104
 105         while ((p = s->ports)) {
 106                 LIST_REMOVE(SocketPort, port, s->ports, p);
 107
 108                 if (p->fd >= 0) {
 109                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 110                         close_nointr_nofail(p->fd);
 111                 }
 112
 113                 free(p->path);
 114                 free(p);
 115         }
 116
 117         exec_context_done(&s->exec_context);
 118         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 119         s->control_command = NULL;
 120
 121         socket_unwatch_control_pid(s);
 122
 123         unit_ref_unset(&s->service);
 124
 125         free(s->tcp_congestion);
 126         s->tcp_congestion = NULL;
 127
 128         free(s->bind_to_device);
 129         s->bind_to_device = NULL;
 130
 131         unit_unwatch_timer(u, &s->timer_watch);
 132 }
 133
 134 static int socket_instantiate_service(Socket *s) {
 135         char *prefix, *name;
 136         int r;
 137         Unit *u;
 138
 139         assert(s);
 140
 141         /* This fills in s->service if it isn't filled in yet. For
 142          * Accept=yes sockets we create the next connection service
 143          * here. For Accept=no this is mostly a NOP since the service
 144          * is figured out at load time anyway. */
 145
 146         if (UNIT_DEREF(s->service))
 147                 return 0;
 148
 149         assert(s->accept);
 150
 151         if (!(prefix = unit_name_to_prefix(UNIT(s)->id)))
 152                 return -ENOMEM;
 153
 154         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 155         free(prefix);
 156
 157         if (r < 0)
 158                 return -ENOMEM;
 159
 160         r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
 161         free(name);
 162
 163         if (r < 0)
 164                 return r;
 165
 166 #ifdef HAVE_SYSV_COMPAT
 167         if (SERVICE(u)->sysv_path) {
 168                 log_error("Using SysV services for socket activation is not supported. Refusing.");
 169                 return -ENOENT;
 170         }
 171 #endif
 172
 173         u->no_gc = true;
 174         unit_ref_set(&s->service, u);
 175
 176         return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
 177 }
 178
 179 static bool have_non_accept_socket(Socket *s) {
 180         SocketPort *p;
 181
 182         assert(s);
 183
 184         if (!s->accept)
 185                 return true;
 186
 187         LIST_FOREACH(port, p, s->ports) {
 188
 189                 if (p->type != SOCKET_SOCKET)
 190                         return true;
 191
 192                 if (!socket_address_can_accept(&p->address))
 193                         return true;
 194         }
 195
 196         return false;
 197 }
 198
 199 static int socket_verify(Socket *s) {
 200         assert(s);
 201
 202         if (UNIT(s)->load_state != UNIT_LOADED)
 203                 return 0;
 204
 205         if (!s->ports) {
 206                 log_error("%s lacks Listen setting. Refusing.", UNIT(s)->id);
 207                 return -EINVAL;
 208         }
 209
 210         if (s->accept && have_non_accept_socket(s)) {
 211                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", UNIT(s)->id);
 212                 return -EINVAL;
 213         }
 214
 215         if (s->accept && s->max_connections <= 0) {
 216                 log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->id);
 217                 return -EINVAL;
 218         }
 219
 220         if (s->accept && UNIT_DEREF(s->service)) {
 221                 log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", UNIT(s)->id);
 222                 return -EINVAL;
 223         }
 224
 225         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 226                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id);
 227                 return -EINVAL;
 228         }
 229
 230         return 0;
 231 }
 232
 233 static bool socket_needs_mount(Socket *s, const char *prefix) {
 234         SocketPort *p;
 235
 236         assert(s);
 237
 238         LIST_FOREACH(port, p, s->ports) {
 239
 240                 if (p->type == SOCKET_SOCKET) {
 241                         if (socket_address_needs_mount(&p->address, prefix))
 242                                 return true;
 243                 } else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL) {
 244                         if (path_startswith(p->path, prefix))
 245                                 return true;
 246                 }
 247         }
 248
 249         return false;
 250 }
 251
 252 int socket_add_one_mount_link(Socket *s, Mount *m) {
 253         int r;
 254
 255         assert(s);
 256         assert(m);
 257
 258         if (UNIT(s)->load_state != UNIT_LOADED ||
 259             UNIT(m)->load_state != UNIT_LOADED)
 260                 return 0;
 261
 262         if (!socket_needs_mount(s, m->where))
 263                 return 0;
 264
 265         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 266                 return r;
 267
 268         return 0;
 269 }
 270
 271 static int socket_add_mount_links(Socket *s) {
 272         Unit *other;
 273         int r;
 274
 275         assert(s);
 276
 277         LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
 278                 if ((r = socket_add_one_mount_link(s, MOUNT(other))) < 0)
 279                         return r;
 280
 281         return 0;
 282 }
 283
 284 static int socket_add_device_link(Socket *s) {
 285         char *t;
 286         int r;
 287
 288         assert(s);
 289
 290         if (!s->bind_to_device)
 291                 return 0;
 292
 293         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 294                 return -ENOMEM;
 295
 296         r = unit_add_node_link(UNIT(s), t, false);
 297         free(t);
 298
 299         return r;
 300 }
 301
 302 static int socket_add_default_dependencies(Socket *s) {
 303         int r;
 304         assert(s);
 305
 306         if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
 307                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
 308                         return r;
 309
 310                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 311                         return r;
 312         }
 313
 314         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 315 }
 316
 317 static bool socket_has_exec(Socket *s) {
 318         unsigned i;
 319         assert(s);
 320
 321         for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
 322                 if (s->exec_command[i])
 323                         return true;
 324
 325         return false;
 326 }
 327
 328 static int socket_load(Unit *u) {
 329         Socket *s = SOCKET(u);
 330         int r;
 331
 332         assert(u);
 333         assert(u->load_state == UNIT_STUB);
 334
 335         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 336                 return r;
 337
 338         /* This is a new unit? Then let's add in some extras */
 339         if (u->load_state == UNIT_LOADED) {
 340
 341                 if (have_non_accept_socket(s)) {
 342
 343                         if (!UNIT_DEREF(s->service)) {
 344                                 Unit *x;
 345
 346                                 r = unit_load_related_unit(u, ".service", &x);
 347                                 if (r < 0)
 348                                         return r;
 349
 350                                 unit_ref_set(&s->service, x);
 351                         }
 352
 353                         r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
 354                         if (r < 0)
 355                                 return r;
 356                 }
 357
 358                 if ((r = socket_add_mount_links(s)) < 0)
 359                         return r;
 360
 361                 if ((r = socket_add_device_link(s)) < 0)
 362                         return r;
 363
 364                 if (socket_has_exec(s))
 365                         if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 366                                 return r;
 367
 368                 if ((r = unit_add_default_cgroups(u)) < 0)
 369                         return r;
 370
 371                 if (UNIT(s)->default_dependencies)
 372                         if ((r = socket_add_default_dependencies(s)) < 0)
 373                                 return r;
 374         }
 375
 376         return socket_verify(s);
 377 }
 378
 379 static const char* listen_lookup(int family, int type) {
 380
 381         if (family == AF_NETLINK)
 382                 return "ListenNetlink";
 383
 384         if (type == SOCK_STREAM)
 385                 return "ListenStream";
 386         else if (type == SOCK_DGRAM)
 387                 return "ListenDatagram";
 388         else if (type == SOCK_SEQPACKET)
 389                 return "ListenSequentialPacket";
 390
 391         assert_not_reached("Unknown socket type");
 392         return NULL;
 393 }
 394
 395 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 396
 397         SocketExecCommand c;
 398         Socket *s = SOCKET(u);
 399         SocketPort *p;
 400         const char *prefix2;
 401         char *p2;
 402
 403         assert(s);
 404         assert(f);
 405
 406         p2 = strappend(prefix, "\t");
 407         prefix2 = p2 ? p2 : prefix;
 408
 409         fprintf(f,
 410                 "%sSocket State: %s\n"
 411                 "%sResult: %s\n"
 412                 "%sBindIPv6Only: %s\n"
 413                 "%sBacklog: %u\n"
 414                 "%sSocketMode: %04o\n"
 415                 "%sDirectoryMode: %04o\n"
 416                 "%sKeepAlive: %s\n"
 417                 "%sFreeBind: %s\n"
 418                 "%sTransparent: %s\n"
 419                 "%sBroadcast: %s\n"
 420                 "%sPassCredentials: %s\n"
 421                 "%sPassSecurity: %s\n"
 422                 "%sTCPCongestion: %s\n",
 423                 prefix, socket_state_to_string(s->state),
 424                 prefix, socket_result_to_string(s->result),
 425                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 426                 prefix, s->backlog,
 427                 prefix, s->socket_mode,
 428                 prefix, s->directory_mode,
 429                 prefix, yes_no(s->keep_alive),
 430                 prefix, yes_no(s->free_bind),
 431                 prefix, yes_no(s->transparent),
 432                 prefix, yes_no(s->broadcast),
 433                 prefix, yes_no(s->pass_cred),
 434                 prefix, yes_no(s->pass_sec),
 435                 prefix, strna(s->tcp_congestion));
 436
 437         if (s->control_pid > 0)
 438                 fprintf(f,
 439                         "%sControl PID: %lu\n",
 440                         prefix, (unsigned long) s->control_pid);
 441
 442         if (s->bind_to_device)
 443                 fprintf(f,
 444                         "%sBindToDevice: %s\n",
 445                         prefix, s->bind_to_device);
 446
 447         if (s->accept)
 448                 fprintf(f,
 449                         "%sAccepted: %u\n"
 450                         "%sNConnections: %u\n"
 451                         "%sMaxConnections: %u\n",
 452                         prefix, s->n_accepted,
 453                         prefix, s->n_connections,
 454                         prefix, s->max_connections);
 455
 456         if (s->priority >= 0)
 457                 fprintf(f,
 458                         "%sPriority: %i\n",
 459                         prefix, s->priority);
 460
 461         if (s->receive_buffer > 0)
 462                 fprintf(f,
 463                         "%sReceiveBuffer: %zu\n",
 464                         prefix, s->receive_buffer);
 465
 466         if (s->send_buffer > 0)
 467                 fprintf(f,
 468                         "%sSendBuffer: %zu\n",
 469                         prefix, s->send_buffer);
 470
 471         if (s->ip_tos >= 0)
 472                 fprintf(f,
 473                         "%sIPTOS: %i\n",
 474                         prefix, s->ip_tos);
 475
 476         if (s->ip_ttl >= 0)
 477                 fprintf(f,
 478                         "%sIPTTL: %i\n",
 479                         prefix, s->ip_ttl);
 480
 481         if (s->pipe_size > 0)
 482                 fprintf(f,
 483                         "%sPipeSize: %zu\n",
 484                         prefix, s->pipe_size);
 485
 486         if (s->mark >= 0)
 487                 fprintf(f,
 488                         "%sMark: %i\n",
 489                         prefix, s->mark);
 490
 491         if (s->mq_maxmsg > 0)
 492                 fprintf(f,
 493                         "%sMessageQueueMaxMessages: %li\n",
 494                         prefix, s->mq_maxmsg);
 495
 496         if (s->mq_msgsize > 0)
 497                 fprintf(f,
 498                         "%sMessageQueueMessageSize: %li\n",
 499                         prefix, s->mq_msgsize);
 500
 501         LIST_FOREACH(port, p, s->ports) {
 502
 503                 if (p->type == SOCKET_SOCKET) {
 504                         const char *t;
 505                         int r;
 506                         char *k = NULL;
 507
 508                         if ((r = socket_address_print(&p->address, &k)) < 0)
 509                                 t = strerror(-r);
 510                         else
 511                                 t = k;
 512
 513                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
 514                         free(k);
 515                 } else if (p->type == SOCKET_SPECIAL)
 516                         fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
 517                 else if (p->type == SOCKET_MQUEUE)
 518                         fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
 519                 else
 520                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 521         }
 522
 523         exec_context_dump(&s->exec_context, f, prefix);
 524
 525         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 526                 if (!s->exec_command[c])
 527                         continue;
 528
 529                 fprintf(f, "%s-> %s:\n",
 530                         prefix, socket_exec_command_to_string(c));
 531
 532                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 533         }
 534
 535         free(p2);
 536 }
 537
 538 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 539         socklen_t l;
 540         char *r;
 541         union {
 542                 struct sockaddr sa;
 543                 struct sockaddr_un un;
 544                 struct sockaddr_in in;
 545                 struct sockaddr_in6 in6;
 546                 struct sockaddr_storage storage;
 547         } local, remote;
 548
 549         assert(fd >= 0);
 550         assert(instance);
 551
 552         l = sizeof(local);
 553         if (getsockname(fd, &local.sa, &l) < 0)
 554                 return -errno;
 555
 556         l = sizeof(remote);
 557         if (getpeername(fd, &remote.sa, &l) < 0)
 558                 return -errno;
 559
 560         switch (local.sa.sa_family) {
 561
 562         case AF_INET: {
 563                 uint32_t
 564                         a = ntohl(local.in.sin_addr.s_addr),
 565                         b = ntohl(remote.in.sin_addr.s_addr);
 566
 567                 if (asprintf(&r,
 568                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 569                              nr,
 570                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 571                              ntohs(local.in.sin_port),
 572                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 573                              ntohs(remote.in.sin_port)) < 0)
 574                         return -ENOMEM;
 575
 576                 break;
 577         }
 578
 579         case AF_INET6: {
 580                 static const char ipv4_prefix[] = {
 581                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 582                 };
 583
 584                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 585                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 586                         const uint8_t
 587                                 *a = local.in6.sin6_addr.s6_addr+12,
 588                                 *b = remote.in6.sin6_addr.s6_addr+12;
 589
 590                         if (asprintf(&r,
 591                                      "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 592                                      nr,
 593                                      a[0], a[1], a[2], a[3],
 594                                      ntohs(local.in6.sin6_port),
 595                                      b[0], b[1], b[2], b[3],
 596                                      ntohs(remote.in6.sin6_port)) < 0)
 597                                 return -ENOMEM;
 598                 } else {
 599                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 600
 601                         if (asprintf(&r,
 602                                      "%u-%s:%u-%s:%u",
 603                                      nr,
 604                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 605                                      ntohs(local.in6.sin6_port),
 606                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 607                                      ntohs(remote.in6.sin6_port)) < 0)
 608                                 return -ENOMEM;
 609                 }
 610
 611                 break;
 612         }
 613
 614         case AF_UNIX: {
 615                 struct ucred ucred;
 616
 617                 l = sizeof(ucred);
 618                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 619                         return -errno;
 620
 621                 if (asprintf(&r,
 622                              "%u-%lu-%lu",
 623                              nr,
 624                              (unsigned long) ucred.pid,
 625                              (unsigned long) ucred.uid) < 0)
 626                         return -ENOMEM;
 627
 628                 break;
 629         }
 630
 631         default:
 632                 assert_not_reached("Unhandled socket type.");
 633         }
 634
 635         *instance = r;
 636         return 0;
 637 }
 638
 639 static void socket_close_fds(Socket *s) {
 640         SocketPort *p;
 641
 642         assert(s);
 643
 644         LIST_FOREACH(port, p, s->ports) {
 645                 if (p->fd < 0)
 646                         continue;
 647
 648                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 649                 close_nointr_nofail(p->fd);
 650
 651                 /* One little note: we should never delete any sockets
 652                  * in the file system here! After all some other
 653                  * process we spawned might still have a reference of
 654                  * this fd and wants to continue to use it. Therefore
 655                  * we delete sockets in the file system before we
 656                  * create a new one, not after we stopped using
 657                  * one! */
 658
 659                 p->fd = -1;
 660         }
 661 }
 662
 663 static void socket_apply_socket_options(Socket *s, int fd) {
 664         assert(s);
 665         assert(fd >= 0);
 666
 667         if (s->keep_alive) {
 668                 int b = s->keep_alive;
 669                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 670                         log_warning("SO_KEEPALIVE failed: %m");
 671         }
 672
 673         if (s->broadcast) {
 674                 int one = 1;
 675                 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
 676                         log_warning("SO_BROADCAST failed: %m");
 677         }
 678
 679         if (s->pass_cred) {
 680                 int one = 1;
 681                 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
 682                         log_warning("SO_PASSCRED failed: %m");
 683         }
 684
 685         if (s->pass_sec) {
 686                 int one = 1;
 687                 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
 688                         log_warning("SO_PASSSEC failed: %m");
 689         }
 690
 691         if (s->priority >= 0)
 692                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 693                         log_warning("SO_PRIORITY failed: %m");
 694
 695         if (s->receive_buffer > 0) {
 696                 int value = (int) s->receive_buffer;
 697
 698                 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
 699
 700                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
 701                         if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 702                                 log_warning("SO_RCVBUF failed: %m");
 703         }
 704
 705         if (s->send_buffer > 0) {
 706                 int value = (int) s->send_buffer;
 707                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
 708                         if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 709                                 log_warning("SO_SNDBUF failed: %m");
 710         }
 711
 712         if (s->mark >= 0)
 713                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 714                         log_warning("SO_MARK failed: %m");
 715
 716         if (s->ip_tos >= 0)
 717                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 718                         log_warning("IP_TOS failed: %m");
 719
 720         if (s->ip_ttl >= 0) {
 721                 int r, x;
 722
 723                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 724
 725                 if (socket_ipv6_is_supported())
 726                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 727                 else {
 728                         x = -1;
 729                         errno = EAFNOSUPPORT;
 730                 }
 731
 732                 if (r < 0 && x < 0)
 733                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 734         }
 735
 736         if (s->tcp_congestion)
 737                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 738                         log_warning("TCP_CONGESTION failed: %m");
 739 }
 740
 741 static void socket_apply_fifo_options(Socket *s, int fd) {
 742         assert(s);
 743         assert(fd >= 0);
 744
 745         if (s->pipe_size > 0)
 746                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 747                         log_warning("F_SETPIPE_SZ: %m");
 748 }
 749
 750 static int fifo_address_create(
 751                 const char *path,
 752                 mode_t directory_mode,
 753                 mode_t socket_mode,
 754                 int *_fd) {
 755
 756         int fd = -1, r = 0;
 757         struct stat st;
 758         mode_t old_mask;
 759
 760         assert(path);
 761         assert(_fd);
 762
 763         mkdir_parents(path, directory_mode);
 764
 765         if ((r = label_fifofile_set(path)) < 0)
 766                 goto fail;
 767
 768         /* Enforce the right access mode for the fifo */
 769         old_mask = umask(~ socket_mode);
 770
 771         /* Include the original umask in our mask */
 772         umask(~socket_mode | old_mask);
 773
 774         r = mkfifo(path, socket_mode);
 775         umask(old_mask);
 776
 777         if (r < 0 && errno != EEXIST) {
 778                 r = -errno;
 779                 goto fail;
 780         }
 781
 782         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 783                 r = -errno;
 784                 goto fail;
 785         }
 786
 787         label_file_clear();
 788
 789         if (fstat(fd, &st) < 0) {
 790                 r = -errno;
 791                 goto fail;
 792         }
 793
 794         if (!S_ISFIFO(st.st_mode) ||
 795             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 796             st.st_uid != getuid() ||
 797             st.st_gid != getgid()) {
 798
 799                 r = -EEXIST;
 800                 goto fail;
 801         }
 802
 803         *_fd = fd;
 804         return 0;
 805
 806 fail:
 807         label_file_clear();
 808
 809         if (fd >= 0)
 810                 close_nointr_nofail(fd);
 811
 812         return r;
 813 }
 814
 815 static int special_address_create(
 816                 const char *path,
 817                 int *_fd) {
 818
 819         int fd = -1, r = 0;
 820         struct stat st;
 821
 822         assert(path);
 823         assert(_fd);
 824
 825         if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 826                 r = -errno;
 827                 goto fail;
 828         }
 829
 830         if (fstat(fd, &st) < 0) {
 831                 r = -errno;
 832                 goto fail;
 833         }
 834
 835         /* Check whether this is a /proc, /sys or /dev file or char device */
 836         if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
 837                 r = -EEXIST;
 838                 goto fail;
 839         }
 840
 841         *_fd = fd;
 842         return 0;
 843
 844 fail:
 845         if (fd >= 0)
 846                 close_nointr_nofail(fd);
 847
 848         return r;
 849 }
 850
 851 static int mq_address_create(
 852                 const char *path,
 853                 mode_t mq_mode,
 854                 long maxmsg,
 855                 long msgsize,
 856                 int *_fd) {
 857
 858         int fd = -1, r = 0;
 859         struct stat st;
 860         mode_t old_mask;
 861         struct mq_attr _attr, *attr = NULL;
 862
 863         assert(path);
 864         assert(_fd);
 865
 866         if (maxmsg > 0 && msgsize > 0) {
 867                 zero(_attr);
 868                 _attr.mq_flags = O_NONBLOCK;
 869                 _attr.mq_maxmsg = maxmsg;
 870                 _attr.mq_msgsize = msgsize;
 871                 attr = &_attr;
 872         }
 873
 874         /* Enforce the right access mode for the mq */
 875         old_mask = umask(~ mq_mode);
 876
 877         /* Include the original umask in our mask */
 878         umask(~mq_mode | old_mask);
 879
 880         fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
 881         umask(old_mask);
 882
 883         if (fd < 0) {
 884                 r = -errno;
 885                 goto fail;
 886         }
 887
 888         if (fstat(fd, &st) < 0) {
 889                 r = -errno;
 890                 goto fail;
 891         }
 892
 893         if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
 894             st.st_uid != getuid() ||
 895             st.st_gid != getgid()) {
 896
 897                 r = -EEXIST;
 898                 goto fail;
 899         }
 900
 901         *_fd = fd;
 902         return 0;
 903
 904 fail:
 905         if (fd >= 0)
 906                 close_nointr_nofail(fd);
 907
 908         return r;
 909 }
 910
 911 static int socket_open_fds(Socket *s) {
 912         SocketPort *p;
 913         int r;
 914         char *label = NULL;
 915         bool know_label = false;
 916
 917         assert(s);
 918
 919         LIST_FOREACH(port, p, s->ports) {
 920
 921                 if (p->fd >= 0)
 922                         continue;
 923
 924                 if (p->type == SOCKET_SOCKET) {
 925
 926                         if (!know_label) {
 927
 928                                 if ((r = socket_instantiate_service(s)) < 0)
 929                                         return r;
 930
 931                                 if (UNIT_DEREF(s->service) &&
 932                                     SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
 933                                         r = label_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
 934
 935                                         if (r < 0) {
 936                                                 if (r != -EPERM)
 937                                                         return r;
 938                                         }
 939                                 }
 940
 941                                 know_label = true;
 942                         }
 943
 944                         if ((r = socket_address_listen(
 945                                              &p->address,
 946                                              s->backlog,
 947                                              s->bind_ipv6_only,
 948                                              s->bind_to_device,
 949                                              s->free_bind,
 950                                              s->transparent,
 951                                              s->directory_mode,
 952                                              s->socket_mode,
 953                                              label,
 954                                              &p->fd)) < 0)
 955                                 goto rollback;
 956
 957                         socket_apply_socket_options(s, p->fd);
 958
 959                 } else  if (p->type == SOCKET_SPECIAL) {
 960
 961                         if ((r = special_address_create(
 962                                              p->path,
 963                                              &p->fd)) < 0)
 964                                 goto rollback;
 965
 966                 } else  if (p->type == SOCKET_FIFO) {
 967
 968                         if ((r = fifo_address_create(
 969                                              p->path,
 970                                              s->directory_mode,
 971                                              s->socket_mode,
 972                                              &p->fd)) < 0)
 973                                 goto rollback;
 974
 975                         socket_apply_fifo_options(s, p->fd);
 976                 } else if (p->type == SOCKET_MQUEUE) {
 977
 978                         if ((r = mq_address_create(
 979                                              p->path,
 980                                              s->socket_mode,
 981                                              s->mq_maxmsg,
 982                                              s->mq_msgsize,
 983                                              &p->fd)) < 0)
 984                                 goto rollback;
 985                 } else
 986                         assert_not_reached("Unknown port type");
 987         }
 988
 989         label_free(label);
 990         return 0;
 991
 992 rollback:
 993         socket_close_fds(s);
 994         label_free(label);
 995         return r;
 996 }
 997
 998 static void socket_unwatch_fds(Socket *s) {
 999         SocketPort *p;
1000
1001         assert(s);
1002
1003         LIST_FOREACH(port, p, s->ports) {
1004                 if (p->fd < 0)
1005                         continue;
1006
1007                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
1008         }
1009 }
1010
1011 static int socket_watch_fds(Socket *s) {
1012         SocketPort *p;
1013         int r;
1014
1015         assert(s);
1016
1017         LIST_FOREACH(port, p, s->ports) {
1018                 if (p->fd < 0)
1019                         continue;
1020
1021                 p->fd_watch.socket_accept =
1022                         s->accept &&
1023                         p->type == SOCKET_SOCKET &&
1024                         socket_address_can_accept(&p->address);
1025
1026                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
1027                         goto fail;
1028         }
1029
1030         return 0;
1031
1032 fail:
1033         socket_unwatch_fds(s);
1034         return r;
1035 }
1036
1037 static void socket_set_state(Socket *s, SocketState state) {
1038         SocketState old_state;
1039         assert(s);
1040
1041         old_state = s->state;
1042         s->state = state;
1043
1044         if (state != SOCKET_START_PRE &&
1045             state != SOCKET_START_POST &&
1046             state != SOCKET_STOP_PRE &&
1047             state != SOCKET_STOP_PRE_SIGTERM &&
1048             state != SOCKET_STOP_PRE_SIGKILL &&
1049             state != SOCKET_STOP_POST &&
1050             state != SOCKET_FINAL_SIGTERM &&
1051             state != SOCKET_FINAL_SIGKILL) {
1052                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1053                 socket_unwatch_control_pid(s);
1054                 s->control_command = NULL;
1055                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1056         }
1057
1058         if (state != SOCKET_LISTENING)
1059                 socket_unwatch_fds(s);
1060
1061         if (state != SOCKET_START_POST &&
1062             state != SOCKET_LISTENING &&
1063             state != SOCKET_RUNNING &&
1064             state != SOCKET_STOP_PRE &&
1065             state != SOCKET_STOP_PRE_SIGTERM &&
1066             state != SOCKET_STOP_PRE_SIGKILL)
1067                 socket_close_fds(s);
1068
1069         if (state != old_state)
1070                 log_debug("%s changed %s -> %s",
1071                           UNIT(s)->id,
1072                           socket_state_to_string(old_state),
1073                           socket_state_to_string(state));
1074
1075         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1076 }
1077
1078 static int socket_coldplug(Unit *u) {
1079         Socket *s = SOCKET(u);
1080         int r;
1081
1082         assert(s);
1083         assert(s->state == SOCKET_DEAD);
1084
1085         if (s->deserialized_state != s->state) {
1086
1087                 if (s->deserialized_state == SOCKET_START_PRE ||
1088                     s->deserialized_state == SOCKET_START_POST ||
1089                     s->deserialized_state == SOCKET_STOP_PRE ||
1090                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1091                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
1092                     s->deserialized_state == SOCKET_STOP_POST ||
1093                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
1094                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
1095
1096                         if (s->control_pid <= 0)
1097                                 return -EBADMSG;
1098
1099                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
1100                                 return r;
1101
1102                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1103                                 return r;
1104                 }
1105
1106                 if (s->deserialized_state == SOCKET_START_POST ||
1107                     s->deserialized_state == SOCKET_LISTENING ||
1108                     s->deserialized_state == SOCKET_RUNNING ||
1109                     s->deserialized_state == SOCKET_STOP_PRE ||
1110                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
1111                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
1112                         if ((r = socket_open_fds(s)) < 0)
1113                                 return r;
1114
1115                 if (s->deserialized_state == SOCKET_LISTENING)
1116                         if ((r = socket_watch_fds(s)) < 0)
1117                                 return r;
1118
1119                 socket_set_state(s, s->deserialized_state);
1120         }
1121
1122         return 0;
1123 }
1124
1125 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1126         pid_t pid;
1127         int r;
1128         char **argv;
1129
1130         assert(s);
1131         assert(c);
1132         assert(_pid);
1133
1134         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1135                 goto fail;
1136
1137         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
1138                 r = -ENOMEM;
1139                 goto fail;
1140         }
1141
1142         r = exec_spawn(c,
1143                        argv,
1144                        &s->exec_context,
1145                        NULL, 0,
1146                        UNIT(s)->manager->environment,
1147                        true,
1148                        true,
1149                        true,
1150                        UNIT(s)->manager->confirm_spawn,
1151                        UNIT(s)->cgroup_bondings,
1152                        UNIT(s)->cgroup_attributes,
1153                        &pid);
1154
1155         strv_free(argv);
1156         if (r < 0)
1157                 goto fail;
1158
1159         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
1160                 /* FIXME: we need to do something here */
1161                 goto fail;
1162
1163         *_pid = pid;
1164
1165         return 0;
1166
1167 fail:
1168         unit_unwatch_timer(UNIT(s), &s->timer_watch);
1169
1170         return r;
1171 }
1172
1173 static void socket_enter_dead(Socket *s, SocketResult f) {
1174         assert(s);
1175
1176         if (f != SOCKET_SUCCESS)
1177                 s->result = f;
1178
1179         socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1180 }
1181
1182 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1183
1184 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1185         int r;
1186         assert(s);
1187
1188         if (f != SOCKET_SUCCESS)
1189                 s->result = f;
1190
1191         socket_unwatch_control_pid(s);
1192
1193         s->control_command_id = SOCKET_EXEC_STOP_POST;
1194
1195         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1196                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1197                         goto fail;
1198
1199                 socket_set_state(s, SOCKET_STOP_POST);
1200         } else
1201                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1202
1203         return;
1204
1205 fail:
1206         log_warning("%s failed to run 'stop-post' task: %s", UNIT(s)->id, strerror(-r));
1207         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1208 }
1209
1210 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1211         int r;
1212         Set *pid_set = NULL;
1213         bool wait_for_exit = false;
1214
1215         assert(s);
1216
1217         if (f != SOCKET_SUCCESS)
1218                 s->result = f;
1219
1220         if (s->exec_context.kill_mode != KILL_NONE) {
1221                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1222
1223                 if (s->control_pid > 0) {
1224                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1225
1226                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1227                         else
1228                                 wait_for_exit = true;
1229                 }
1230
1231                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1232
1233                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1234                                 r = -ENOMEM;
1235                                 goto fail;
1236                         }
1237
1238                         /* Exclude the control pid from being killed via the cgroup */
1239                         if (s->control_pid > 0)
1240                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1241                                         goto fail;
1242
1243                         if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 0) {
1244                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1245                                         log_warning("Failed to kill control group: %s", strerror(-r));
1246                         } else if (r > 0)
1247                                 wait_for_exit = true;
1248
1249                         set_free(pid_set);
1250                         pid_set = NULL;
1251                 }
1252         }
1253
1254         if (wait_for_exit) {
1255                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1256                         goto fail;
1257
1258                 socket_set_state(s, state);
1259         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1260                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1261         else
1262                 socket_enter_dead(s, SOCKET_SUCCESS);
1263
1264         return;
1265
1266 fail:
1267         log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
1268
1269         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1270                 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1271         else
1272                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1273
1274         if (pid_set)
1275                 set_free(pid_set);
1276 }
1277
1278 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1279         int r;
1280         assert(s);
1281
1282         if (f != SOCKET_SUCCESS)
1283                 s->result = f;
1284
1285         socket_unwatch_control_pid(s);
1286
1287         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1288
1289         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1290                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1291                         goto fail;
1292
1293                 socket_set_state(s, SOCKET_STOP_PRE);
1294         } else
1295                 socket_enter_stop_post(s, SOCKET_SUCCESS);
1296
1297         return;
1298
1299 fail:
1300         log_warning("%s failed to run 'stop-pre' task: %s", UNIT(s)->id, strerror(-r));
1301         socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1302 }
1303
1304 static void socket_enter_listening(Socket *s) {
1305         int r;
1306         assert(s);
1307
1308         r = socket_watch_fds(s);
1309         if (r < 0) {
1310                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1311                 goto fail;
1312         }
1313
1314         socket_set_state(s, SOCKET_LISTENING);
1315         return;
1316
1317 fail:
1318         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1319 }
1320
1321 static void socket_enter_start_post(Socket *s) {
1322         int r;
1323         assert(s);
1324
1325         r = socket_open_fds(s);
1326         if (r < 0) {
1327                 log_warning("%s failed to listen on sockets: %s", UNIT(s)->id, strerror(-r));
1328                 goto fail;
1329         }
1330
1331         socket_unwatch_control_pid(s);
1332
1333         s->control_command_id = SOCKET_EXEC_START_POST;
1334
1335         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1336                 r = socket_spawn(s, s->control_command, &s->control_pid);
1337                 if (r < 0) {
1338                         log_warning("%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
1339                         goto fail;
1340                 }
1341
1342                 socket_set_state(s, SOCKET_START_POST);
1343         } else
1344                 socket_enter_listening(s);
1345
1346         return;
1347
1348 fail:
1349         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1350 }
1351
1352 static void socket_enter_start_pre(Socket *s) {
1353         int r;
1354         assert(s);
1355
1356         socket_unwatch_control_pid(s);
1357
1358         s->control_command_id = SOCKET_EXEC_START_PRE;
1359
1360         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1361                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1362                         goto fail;
1363
1364                 socket_set_state(s, SOCKET_START_PRE);
1365         } else
1366                 socket_enter_start_post(s);
1367
1368         return;
1369
1370 fail:
1371         log_warning("%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
1372         socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1373 }
1374
1375 static void socket_enter_running(Socket *s, int cfd) {
1376         int r;
1377         DBusError error;
1378
1379         assert(s);
1380         dbus_error_init(&error);
1381
1382         /* We don't take connections anymore if we are supposed to
1383          * shut down anyway */
1384         if (unit_pending_inactive(UNIT(s))) {
1385                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
1386
1387                 if (cfd >= 0)
1388                         close_nointr_nofail(cfd);
1389                 else  {
1390                         /* Flush all sockets by closing and reopening them */
1391                         socket_close_fds(s);
1392
1393                         r = socket_watch_fds(s);
1394                         if (r < 0) {
1395                                 log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
1396                                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1397                         }
1398                 }
1399
1400                 return;
1401         }
1402
1403         if (cfd < 0) {
1404                 Iterator i;
1405                 Unit *u;
1406                 bool pending = false;
1407
1408                 /* If there's already a start pending don't bother to
1409                  * do anything */
1410                 SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
1411                         if (unit_pending_active(u)) {
1412                                 pending = true;
1413                                 break;
1414                         }
1415
1416                 if (!pending) {
1417                         r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
1418                         if (r < 0)
1419                                 goto fail;
1420                 }
1421
1422                 socket_set_state(s, SOCKET_RUNNING);
1423         } else {
1424                 char *prefix, *instance = NULL, *name;
1425                 Service *service;
1426
1427                 if (s->n_connections >= s->max_connections) {
1428                         log_warning("Too many incoming connections (%u)", s->n_connections);
1429                         close_nointr_nofail(cfd);
1430                         return;
1431                 }
1432
1433                 r = socket_instantiate_service(s);
1434                 if (r < 0)
1435                         goto fail;
1436
1437                 r = instance_from_socket(cfd, s->n_accepted, &instance);
1438                 if (r < 0) {
1439                         if (r != -ENOTCONN)
1440                                 goto fail;
1441
1442                         /* ENOTCONN is legitimate if TCP RST was received.
1443                          * This connection is over, but the socket unit lives on. */
1444                         close_nointr_nofail(cfd);
1445                         return;
1446                 }
1447
1448                 prefix = unit_name_to_prefix(UNIT(s)->id);
1449                 if (!prefix) {
1450                         free(instance);
1451                         r = -ENOMEM;
1452                         goto fail;
1453                 }
1454
1455                 name = unit_name_build(prefix, instance, ".service");
1456                 free(prefix);
1457                 free(instance);
1458
1459                 if (!name) {
1460                         r = -ENOMEM;
1461                         goto fail;
1462                 }
1463
1464                 r = unit_add_name(UNIT_DEREF(s->service), name);
1465                 if (r < 0) {
1466                         free(name);
1467                         goto fail;
1468                 }
1469
1470                 service = SERVICE(UNIT_DEREF(s->service));
1471                 unit_ref_unset(&s->service);
1472                 s->n_accepted ++;
1473
1474                 UNIT(service)->no_gc = false;
1475
1476                 unit_choose_id(UNIT(service), name);
1477                 free(name);
1478
1479                 r = service_set_socket_fd(service, cfd, s);
1480                 if (r < 0)
1481                         goto fail;
1482
1483                 cfd = -1;
1484                 s->n_connections ++;
1485
1486                 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
1487                 if (r < 0)
1488                         goto fail;
1489
1490                 /* Notify clients about changed counters */
1491                 unit_add_to_dbus_queue(UNIT(s));
1492         }
1493
1494         return;
1495
1496 fail:
1497         log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
1498         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1499
1500         if (cfd >= 0)
1501                 close_nointr_nofail(cfd);
1502
1503         dbus_error_free(&error);
1504 }
1505
1506 static void socket_run_next(Socket *s) {
1507         int r;
1508
1509         assert(s);
1510         assert(s->control_command);
1511         assert(s->control_command->command_next);
1512
1513         socket_unwatch_control_pid(s);
1514
1515         s->control_command = s->control_command->command_next;
1516
1517         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1518                 goto fail;
1519
1520         return;
1521
1522 fail:
1523         log_warning("%s failed to run next task: %s", UNIT(s)->id, strerror(-r));
1524
1525         if (s->state == SOCKET_START_POST)
1526                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1527         else if (s->state == SOCKET_STOP_POST)
1528                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1529         else
1530                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1531 }
1532
1533 static int socket_start(Unit *u) {
1534         Socket *s = SOCKET(u);
1535
1536         assert(s);
1537
1538         /* We cannot fulfill this request right now, try again later
1539          * please! */
1540         if (s->state == SOCKET_STOP_PRE ||
1541             s->state == SOCKET_STOP_PRE_SIGKILL ||
1542             s->state == SOCKET_STOP_PRE_SIGTERM ||
1543             s->state == SOCKET_STOP_POST ||
1544             s->state == SOCKET_FINAL_SIGTERM ||
1545             s->state == SOCKET_FINAL_SIGKILL)
1546                 return -EAGAIN;
1547
1548         if (s->state == SOCKET_START_PRE ||
1549             s->state == SOCKET_START_POST)
1550                 return 0;
1551
1552         /* Cannot run this without the service being around */
1553         if (UNIT_DEREF(s->service)) {
1554                 Service *service;
1555
1556                 service = SERVICE(UNIT_DEREF(s->service));
1557
1558                 if (UNIT(service)->load_state != UNIT_LOADED) {
1559                         log_error("Socket service %s not loaded, refusing.", UNIT(service)->id);
1560                         return -ENOENT;
1561                 }
1562
1563                 /* If the service is already active we cannot start the
1564                  * socket */
1565                 if (service->state != SERVICE_DEAD &&
1566                     service->state != SERVICE_FAILED &&
1567                     service->state != SERVICE_AUTO_RESTART) {
1568                         log_error("Socket service %s already active, refusing.", UNIT(service)->id);
1569                         return -EBUSY;
1570                 }
1571
1572 #ifdef HAVE_SYSV_COMPAT
1573                 if (service->sysv_path) {
1574                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1575                         return -ENOENT;
1576                 }
1577 #endif
1578         }
1579
1580         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1581
1582         s->result = SOCKET_SUCCESS;
1583         socket_enter_start_pre(s);
1584         return 0;
1585 }
1586
1587 static int socket_stop(Unit *u) {
1588         Socket *s = SOCKET(u);
1589
1590         assert(s);
1591
1592         /* Already on it */
1593         if (s->state == SOCKET_STOP_PRE ||
1594             s->state == SOCKET_STOP_PRE_SIGTERM ||
1595             s->state == SOCKET_STOP_PRE_SIGKILL ||
1596             s->state == SOCKET_STOP_POST ||
1597             s->state == SOCKET_FINAL_SIGTERM ||
1598             s->state == SOCKET_FINAL_SIGKILL)
1599                 return 0;
1600
1601         /* If there's already something running we go directly into
1602          * kill mode. */
1603         if (s->state == SOCKET_START_PRE ||
1604             s->state == SOCKET_START_POST) {
1605                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
1606                 return -EAGAIN;
1607         }
1608
1609         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1610
1611         socket_enter_stop_pre(s, SOCKET_SUCCESS);
1612         return 0;
1613 }
1614
1615 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1616         Socket *s = SOCKET(u);
1617         SocketPort *p;
1618         int r;
1619
1620         assert(u);
1621         assert(f);
1622         assert(fds);
1623
1624         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1625         unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
1626         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1627
1628         if (s->control_pid > 0)
1629                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1630
1631         if (s->control_command_id >= 0)
1632                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1633
1634         LIST_FOREACH(port, p, s->ports) {
1635                 int copy;
1636
1637                 if (p->fd < 0)
1638                         continue;
1639
1640                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1641                         return copy;
1642
1643                 if (p->type == SOCKET_SOCKET) {
1644                         char *t;
1645
1646                         if ((r = socket_address_print(&p->address, &t)) < 0)
1647                                 return r;
1648
1649                         if (socket_address_family(&p->address) == AF_NETLINK)
1650                                 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
1651                         else
1652                                 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1653                         free(t);
1654                 } else if (p->type == SOCKET_SPECIAL)
1655                         unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
1656                 else {
1657                         assert(p->type == SOCKET_FIFO);
1658                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1659                 }
1660         }
1661
1662         return 0;
1663 }
1664
1665 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1666         Socket *s = SOCKET(u);
1667
1668         assert(u);
1669         assert(key);
1670         assert(value);
1671         assert(fds);
1672
1673         if (streq(key, "state")) {
1674                 SocketState state;
1675
1676                 if ((state = socket_state_from_string(value)) < 0)
1677                         log_debug("Failed to parse state value %s", value);
1678                 else
1679                         s->deserialized_state = state;
1680         } else if (streq(key, "result")) {
1681                 SocketResult f;
1682
1683                 f = socket_result_from_string(value);
1684                 if (f < 0)
1685                         log_debug("Failed to parse result value %s", value);
1686                 else if (f != SOCKET_SUCCESS)
1687                         s->result = f;
1688
1689         } else if (streq(key, "n-accepted")) {
1690                 unsigned k;
1691
1692                 if (safe_atou(value, &k) < 0)
1693                         log_debug("Failed to parse n-accepted value %s", value);
1694                 else
1695                         s->n_accepted += k;
1696         } else if (streq(key, "control-pid")) {
1697                 pid_t pid;
1698
1699                 if (parse_pid(value, &pid) < 0)
1700                         log_debug("Failed to parse control-pid value %s", value);
1701                 else
1702                         s->control_pid = pid;
1703         } else if (streq(key, "control-command")) {
1704                 SocketExecCommand id;
1705
1706                 if ((id = socket_exec_command_from_string(value)) < 0)
1707                         log_debug("Failed to parse exec-command value %s", value);
1708                 else {
1709                         s->control_command_id = id;
1710                         s->control_command = s->exec_command[id];
1711                 }
1712         } else if (streq(key, "fifo")) {
1713                 int fd, skip = 0;
1714                 SocketPort *p;
1715
1716                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1717                         log_debug("Failed to parse fifo value %s", value);
1718                 else {
1719
1720                         LIST_FOREACH(port, p, s->ports)
1721                                 if (p->type == SOCKET_FIFO &&
1722                                     streq_ptr(p->path, value+skip))
1723                                         break;
1724
1725                         if (p) {
1726                                 if (p->fd >= 0)
1727                                         close_nointr_nofail(p->fd);
1728                                 p->fd = fdset_remove(fds, fd);
1729                         }
1730                 }
1731
1732         } else if (streq(key, "special")) {
1733                 int fd, skip = 0;
1734                 SocketPort *p;
1735
1736                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1737                         log_debug("Failed to parse special value %s", value);
1738                 else {
1739
1740                         LIST_FOREACH(port, p, s->ports)
1741                                 if (p->type == SOCKET_SPECIAL &&
1742                                     streq_ptr(p->path, value+skip))
1743                                         break;
1744
1745                         if (p) {
1746                                 if (p->fd >= 0)
1747                                         close_nointr_nofail(p->fd);
1748                                 p->fd = fdset_remove(fds, fd);
1749                         }
1750                 }
1751
1752         } else if (streq(key, "socket")) {
1753                 int fd, type, skip = 0;
1754                 SocketPort *p;
1755
1756                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1757                         log_debug("Failed to parse socket value %s", value);
1758                 else {
1759
1760                         LIST_FOREACH(port, p, s->ports)
1761                                 if (socket_address_is(&p->address, value+skip, type))
1762                                         break;
1763
1764                         if (p) {
1765                                 if (p->fd >= 0)
1766                                         close_nointr_nofail(p->fd);
1767                                 p->fd = fdset_remove(fds, fd);
1768                         }
1769                 }
1770
1771         } else if (streq(key, "netlink")) {
1772                 int fd, skip = 0;
1773                 SocketPort *p;
1774
1775                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1776                         log_debug("Failed to parse socket value %s", value);
1777                 else {
1778
1779                         LIST_FOREACH(port, p, s->ports)
1780                                 if (socket_address_is_netlink(&p->address, value+skip))
1781                                         break;
1782
1783                         if (p) {
1784                                 if (p->fd >= 0)
1785                                         close_nointr_nofail(p->fd);
1786                                 p->fd = fdset_remove(fds, fd);
1787                         }
1788                 }
1789
1790         } else
1791                 log_debug("Unknown serialization key '%s'", key);
1792
1793         return 0;
1794 }
1795
1796 static UnitActiveState socket_active_state(Unit *u) {
1797         assert(u);
1798
1799         return state_translation_table[SOCKET(u)->state];
1800 }
1801
1802 static const char *socket_sub_state_to_string(Unit *u) {
1803         assert(u);
1804
1805         return socket_state_to_string(SOCKET(u)->state);
1806 }
1807
1808 static bool socket_check_gc(Unit *u) {
1809         Socket *s = SOCKET(u);
1810
1811         assert(u);
1812
1813         return s->n_connections > 0;
1814 }
1815
1816 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1817         Socket *s = SOCKET(u);
1818         int cfd = -1;
1819
1820         assert(s);
1821         assert(fd >= 0);
1822
1823         if (s->state != SOCKET_LISTENING)
1824                 return;
1825
1826         log_debug("Incoming traffic on %s", u->id);
1827
1828         if (events != EPOLLIN) {
1829
1830                 if (events & EPOLLHUP)
1831                         log_error("%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.", u->id);
1832                 else
1833                         log_error("%s: Got unexpected poll event (0x%x) on socket.", u->id, events);
1834
1835                 goto fail;
1836         }
1837
1838         if (w->socket_accept) {
1839                 for (;;) {
1840
1841                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1842
1843                                 if (errno == EINTR)
1844                                         continue;
1845
1846                                 log_error("Failed to accept socket: %m");
1847                                 goto fail;
1848                         }
1849
1850                         break;
1851                 }
1852
1853                 socket_apply_socket_options(s, cfd);
1854         }
1855
1856         socket_enter_running(s, cfd);
1857         return;
1858
1859 fail:
1860         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1861 }
1862
1863 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1864         Socket *s = SOCKET(u);
1865         SocketResult f;
1866
1867         assert(s);
1868         assert(pid >= 0);
1869
1870         if (pid != s->control_pid)
1871                 return;
1872
1873         s->control_pid = 0;
1874
1875         if (is_clean_exit(code, status))
1876                 f = SOCKET_SUCCESS;
1877         else if (code == CLD_EXITED)
1878                 f = SOCKET_FAILURE_EXIT_CODE;
1879         else if (code == CLD_KILLED)
1880                 f = SOCKET_FAILURE_SIGNAL;
1881         else if (code == CLD_DUMPED)
1882                 f = SOCKET_FAILURE_CORE_DUMP;
1883         else
1884                 assert_not_reached("Unknown code");
1885
1886         if (s->control_command) {
1887                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1888
1889                 if (s->control_command->ignore)
1890                         f = SOCKET_SUCCESS;
1891         }
1892
1893         log_full(f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1894                  "%s control process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1895
1896         if (f != SOCKET_SUCCESS)
1897                 s->result = f;
1898
1899         if (s->control_command &&
1900             s->control_command->command_next &&
1901             f == SOCKET_SUCCESS) {
1902
1903                 log_debug("%s running next command for state %s", u->id, socket_state_to_string(s->state));
1904                 socket_run_next(s);
1905         } else {
1906                 s->control_command = NULL;
1907                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1908
1909                 /* No further commands for this step, so let's figure
1910                  * out what to do next */
1911
1912                 log_debug("%s got final SIGCHLD for state %s", u->id, socket_state_to_string(s->state));
1913
1914                 switch (s->state) {
1915
1916                 case SOCKET_START_PRE:
1917                         if (f == SOCKET_SUCCESS)
1918                                 socket_enter_start_post(s);
1919                         else
1920                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
1921                         break;
1922
1923                 case SOCKET_START_POST:
1924                         if (f == SOCKET_SUCCESS)
1925                                 socket_enter_listening(s);
1926                         else
1927                                 socket_enter_stop_pre(s, f);
1928                         break;
1929
1930                 case SOCKET_STOP_PRE:
1931                 case SOCKET_STOP_PRE_SIGTERM:
1932                 case SOCKET_STOP_PRE_SIGKILL:
1933                         socket_enter_stop_post(s, f);
1934                         break;
1935
1936                 case SOCKET_STOP_POST:
1937                 case SOCKET_FINAL_SIGTERM:
1938                 case SOCKET_FINAL_SIGKILL:
1939                         socket_enter_dead(s, f);
1940                         break;
1941
1942                 default:
1943                         assert_not_reached("Uh, control process died at wrong time.");
1944                 }
1945         }
1946
1947         /* Notify clients about changed exit status */
1948         unit_add_to_dbus_queue(u);
1949 }
1950
1951 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1952         Socket *s = SOCKET(u);
1953
1954         assert(s);
1955         assert(elapsed == 1);
1956         assert(w == &s->timer_watch);
1957
1958         switch (s->state) {
1959
1960         case SOCKET_START_PRE:
1961                 log_warning("%s starting timed out. Terminating.", u->id);
1962                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1963                 break;
1964
1965         case SOCKET_START_POST:
1966                 log_warning("%s starting timed out. Stopping.", u->id);
1967                 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
1968                 break;
1969
1970         case SOCKET_STOP_PRE:
1971                 log_warning("%s stopping timed out. Terminating.", u->id);
1972                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1973                 break;
1974
1975         case SOCKET_STOP_PRE_SIGTERM:
1976                 if (s->exec_context.send_sigkill) {
1977                         log_warning("%s stopping timed out. Killing.", u->id);
1978                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1979                 } else {
1980                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->id);
1981                         socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1982                 }
1983                 break;
1984
1985         case SOCKET_STOP_PRE_SIGKILL:
1986                 log_warning("%s still around after SIGKILL. Ignoring.", u->id);
1987                 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
1988                 break;
1989
1990         case SOCKET_STOP_POST:
1991                 log_warning("%s stopping timed out (2). Terminating.", u->id);
1992                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
1993                 break;
1994
1995         case SOCKET_FINAL_SIGTERM:
1996                 if (s->exec_context.send_sigkill) {
1997                         log_warning("%s stopping timed out (2). Killing.", u->id);
1998                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
1999                 } else {
2000                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->id);
2001                         socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2002                 }
2003                 break;
2004
2005         case SOCKET_FINAL_SIGKILL:
2006                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->id);
2007                 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2008                 break;
2009
2010         default:
2011                 assert_not_reached("Timeout at wrong time.");
2012         }
2013 }
2014
2015 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
2016         int *rfds;
2017         unsigned rn_fds, k;
2018         SocketPort *p;
2019
2020         assert(s);
2021         assert(fds);
2022         assert(n_fds);
2023
2024         /* Called from the service code for requesting our fds */
2025
2026         rn_fds = 0;
2027         LIST_FOREACH(port, p, s->ports)
2028                 if (p->fd >= 0)
2029                         rn_fds++;
2030
2031         if (rn_fds <= 0) {
2032                 *fds = NULL;
2033                 *n_fds = 0;
2034                 return 0;
2035         }
2036
2037         if (!(rfds = new(int, rn_fds)))
2038                 return -ENOMEM;
2039
2040         k = 0;
2041         LIST_FOREACH(port, p, s->ports)
2042                 if (p->fd >= 0)
2043                         rfds[k++] = p->fd;
2044
2045         assert(k == rn_fds);
2046
2047         *fds = rfds;
2048         *n_fds = rn_fds;
2049
2050         return 0;
2051 }
2052
2053 void socket_notify_service_dead(Socket *s, bool failed_permanent) {
2054         assert(s);
2055
2056         /* The service is dead. Dang!
2057          *
2058          * This is strictly for one-instance-for-all-connections
2059          * services. */
2060
2061         if (s->state == SOCKET_RUNNING) {
2062                 log_debug("%s got notified about service death (failed permanently: %s)", UNIT(s)->id, yes_no(failed_permanent));
2063                 if (failed_permanent)
2064                         socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_FAILED_PERMANENT);
2065                 else
2066                         socket_enter_listening(s);
2067         }
2068 }
2069
2070 void socket_connection_unref(Socket *s) {
2071         assert(s);
2072
2073         /* The service is dead. Yay!
2074          *
2075          * This is strictly for one-instance-per-connection
2076          * services. */
2077
2078         assert(s->n_connections > 0);
2079         s->n_connections--;
2080
2081         log_debug("%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
2082 }
2083
2084 static void socket_reset_failed(Unit *u) {
2085         Socket *s = SOCKET(u);
2086
2087         assert(s);
2088
2089         if (s->state == SOCKET_FAILED)
2090                 socket_set_state(s, SOCKET_DEAD);
2091
2092         s->result = SOCKET_SUCCESS;
2093 }
2094
2095 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
2096         Socket *s = SOCKET(u);
2097         int r = 0;
2098         Set *pid_set = NULL;
2099
2100         assert(s);
2101
2102         if (who == KILL_MAIN) {
2103                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
2104                 return -ESRCH;
2105         }
2106
2107         if (s->control_pid <= 0 && who == KILL_CONTROL) {
2108                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
2109                 return -ESRCH;
2110         }
2111
2112         if (who == KILL_CONTROL || who == KILL_ALL)
2113                 if (s->control_pid > 0)
2114                         if (kill(s->control_pid, signo) < 0)
2115                                 r = -errno;
2116
2117         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
2118                 int q;
2119
2120                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
2121                         return -ENOMEM;
2122
2123                 /* Exclude the control pid from being killed via the cgroup */
2124                 if (s->control_pid > 0)
2125                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
2126                                 r = q;
2127                                 goto finish;
2128                         }
2129
2130                 if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
2131                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
2132                                 r = q;
2133         }
2134
2135 finish:
2136         if (pid_set)
2137                 set_free(pid_set);
2138
2139         return r;
2140 }
2141
2142 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2143         [SOCKET_DEAD] = "dead",
2144         [SOCKET_START_PRE] = "start-pre",
2145         [SOCKET_START_POST] = "start-post",
2146         [SOCKET_LISTENING] = "listening",
2147         [SOCKET_RUNNING] = "running",
2148         [SOCKET_STOP_PRE] = "stop-pre",
2149         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2150         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2151         [SOCKET_STOP_POST] = "stop-post",
2152         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2153         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2154         [SOCKET_FAILED] = "failed"
2155 };
2156
2157 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2158
2159 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2160         [SOCKET_EXEC_START_PRE] = "StartPre",
2161         [SOCKET_EXEC_START_POST] = "StartPost",
2162         [SOCKET_EXEC_STOP_PRE] = "StopPre",
2163         [SOCKET_EXEC_STOP_POST] = "StopPost"
2164 };
2165
2166 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2167
2168 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
2169         [SOCKET_SUCCESS] = "success",
2170         [SOCKET_FAILURE_RESOURCES] = "resources",
2171         [SOCKET_FAILURE_TIMEOUT] = "timeout",
2172         [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
2173         [SOCKET_FAILURE_SIGNAL] = "signal",
2174         [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
2175         [SOCKET_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent"
2176 };
2177
2178 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
2179
2180 const UnitVTable socket_vtable = {
2181         .suffix = ".socket",
2182         .object_size = sizeof(Socket),
2183         .sections =
2184                 "Unit\0"
2185                 "Socket\0"
2186                 "Install\0",
2187
2188         .init = socket_init,
2189         .done = socket_done,
2190         .load = socket_load,
2191
2192         .kill = socket_kill,
2193
2194         .coldplug = socket_coldplug,
2195
2196         .dump = socket_dump,
2197
2198         .start = socket_start,
2199         .stop = socket_stop,
2200
2201         .serialize = socket_serialize,
2202         .deserialize_item = socket_deserialize_item,
2203
2204         .active_state = socket_active_state,
2205         .sub_state_to_string = socket_sub_state_to_string,
2206
2207         .check_gc = socket_check_gc,
2208
2209         .fd_event = socket_fd_event,
2210         .sigchld_event = socket_sigchld_event,
2211         .timer_event = socket_timer_event,
2212
2213         .reset_failed = socket_reset_failed,
2214
2215         .bus_interface = "org.freedesktop.systemd1.Socket",
2216         .bus_message_handler = bus_socket_message_handler,
2217         .bus_invalidating_properties =  bus_socket_invalidating_properties
2218 };