src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29 #include <arpa/inet.h>
  30
  31 #include "unit.h"
  32 #include "socket.h"
  33 #include "netinet/tcp.h"
  34 #include "log.h"
  35 #include "load-dropin.h"
  36 #include "load-fragment.h"
  37 #include "strv.h"
  38 #include "unit-name.h"
  39 #include "dbus-socket.h"
  40 #include "missing.h"
  41 #include "special.h"
  42 #include "bus-errors.h"
  43 #include "label.h"
  44 #include "exit-status.h"
  45
  46 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  47         [SOCKET_DEAD] = UNIT_INACTIVE,
  48         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  49         [SOCKET_START_POST] = UNIT_ACTIVATING,
  50         [SOCKET_LISTENING] = UNIT_ACTIVE,
  51         [SOCKET_RUNNING] = UNIT_ACTIVE,
  52         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  53         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  54         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  55         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  56         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  57         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  58         [SOCKET_FAILED] = UNIT_FAILED
  59 };
  60
  61 static void socket_init(Unit *u) {
  62         Socket *s = SOCKET(u);
  63
  64         assert(u);
  65         assert(u->meta.load_state == UNIT_STUB);
  66
  67         s->backlog = SOMAXCONN;
  68         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  69         s->directory_mode = 0755;
  70         s->socket_mode = 0666;
  71
  72         s->max_connections = 64;
  73
  74         s->priority = -1;
  75         s->ip_tos = -1;
  76         s->ip_ttl = -1;
  77         s->mark = -1;
  78
  79         exec_context_init(&s->exec_context);
  80
  81         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  82 }
  83
  84 static void socket_unwatch_control_pid(Socket *s) {
  85         assert(s);
  86
  87         if (s->control_pid <= 0)
  88                 return;
  89
  90         unit_unwatch_pid(UNIT(s), s->control_pid);
  91         s->control_pid = 0;
  92 }
  93
  94 static void socket_done(Unit *u) {
  95         Socket *s = SOCKET(u);
  96         SocketPort *p;
  97         Meta *i;
  98
  99         assert(s);
 100
 101         while ((p = s->ports)) {
 102                 LIST_REMOVE(SocketPort, port, s->ports, p);
 103
 104                 if (p->fd >= 0) {
 105                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
 106                         close_nointr_nofail(p->fd);
 107                 }
 108
 109                 free(p->path);
 110                 free(p);
 111         }
 112
 113         exec_context_done(&s->exec_context);
 114         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 115         s->control_command = NULL;
 116
 117         socket_unwatch_control_pid(s);
 118
 119         s->service = NULL;
 120
 121         free(s->tcp_congestion);
 122         s->tcp_congestion = NULL;
 123
 124         free(s->bind_to_device);
 125         s->bind_to_device = NULL;
 126
 127         unit_unwatch_timer(u, &s->timer_watch);
 128
 129         /* Make sure no service instance refers to us anymore. */
 130         LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
 131                 Service *service = (Service *) i;
 132
 133                 if (service->accept_socket == s)
 134                         service->accept_socket = NULL;
 135
 136                 set_remove(service->configured_sockets, s);
 137         }
 138 }
 139
 140 static int socket_instantiate_service(Socket *s) {
 141         char *prefix, *name;
 142         int r;
 143         Unit *u;
 144
 145         assert(s);
 146
 147         /* This fills in s->service if it isn't filled in yet. For
 148          * Accept=yes sockets we create the next connection service
 149          * here. For Accept=no this is mostly a NOP since the service
 150          * is figured out at load time anyway. */
 151
 152         if (s->service)
 153                 return 0;
 154
 155         assert(s->accept);
 156
 157         if (!(prefix = unit_name_to_prefix(s->meta.id)))
 158                 return -ENOMEM;
 159
 160         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
 161         free(prefix);
 162
 163         if (r < 0)
 164                 return -ENOMEM;
 165
 166         r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
 167         free(name);
 168
 169         if (r < 0)
 170                 return r;
 171
 172 #ifdef HAVE_SYSV_COMPAT
 173         if (SERVICE(u)->sysv_path) {
 174                 log_error("Using SysV services for socket activation is not supported. Refusing.");
 175                 return -ENOENT;
 176         }
 177 #endif
 178
 179         u->meta.no_gc = true;
 180         s->service = SERVICE(u);
 181         return 0;
 182 }
 183
 184 static bool have_non_accept_socket(Socket *s) {
 185         SocketPort *p;
 186
 187         assert(s);
 188
 189         if (!s->accept)
 190                 return true;
 191
 192         LIST_FOREACH(port, p, s->ports) {
 193
 194                 if (p->type != SOCKET_SOCKET)
 195                         return true;
 196
 197                 if (!socket_address_can_accept(&p->address))
 198                         return true;
 199         }
 200
 201         return false;
 202 }
 203
 204 static int socket_verify(Socket *s) {
 205         assert(s);
 206
 207         if (s->meta.load_state != UNIT_LOADED)
 208                 return 0;
 209
 210         if (!s->ports) {
 211                 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
 212                 return -EINVAL;
 213         }
 214
 215         if (s->accept && have_non_accept_socket(s)) {
 216                 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
 217                 return -EINVAL;
 218         }
 219
 220         if (s->accept && s->max_connections <= 0) {
 221                 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
 222                 return -EINVAL;
 223         }
 224
 225         if (s->accept && s->service) {
 226                 log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", s->meta.id);
 227                 return -EINVAL;
 228         }
 229
 230         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 231                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
 232                 return -EINVAL;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static bool socket_needs_mount(Socket *s, const char *prefix) {
 239         SocketPort *p;
 240
 241         assert(s);
 242
 243         LIST_FOREACH(port, p, s->ports) {
 244
 245                 if (p->type == SOCKET_SOCKET) {
 246                         if (socket_address_needs_mount(&p->address, prefix))
 247                                 return true;
 248                 } else {
 249                         assert(p->type == SOCKET_FIFO);
 250                         if (path_startswith(p->path, prefix))
 251                                 return true;
 252                 }
 253         }
 254
 255         return false;
 256 }
 257
 258 int socket_add_one_mount_link(Socket *s, Mount *m) {
 259         int r;
 260
 261         assert(s);
 262         assert(m);
 263
 264         if (s->meta.load_state != UNIT_LOADED ||
 265             m->meta.load_state != UNIT_LOADED)
 266                 return 0;
 267
 268         if (!socket_needs_mount(s, m->where))
 269                 return 0;
 270
 271         if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 272                 return r;
 273
 274         return 0;
 275 }
 276
 277 static int socket_add_mount_links(Socket *s) {
 278         Meta *other;
 279         int r;
 280
 281         assert(s);
 282
 283         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 284                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 285                         return r;
 286
 287         return 0;
 288 }
 289
 290 static int socket_add_device_link(Socket *s) {
 291         char *t;
 292         int r;
 293
 294         assert(s);
 295
 296         if (!s->bind_to_device)
 297                 return 0;
 298
 299         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 300                 return -ENOMEM;
 301
 302         r = unit_add_node_link(UNIT(s), t, false);
 303         free(t);
 304
 305         return r;
 306 }
 307
 308 static int socket_add_default_dependencies(Socket *s) {
 309         int r;
 310         assert(s);
 311
 312         if (s->meta.manager->running_as == MANAGER_SYSTEM) {
 313                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
 314                         return r;
 315
 316                 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 317                         return r;
 318         }
 319
 320         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 321 }
 322
 323 static int socket_load(Unit *u) {
 324         Socket *s = SOCKET(u);
 325         int r;
 326
 327         assert(u);
 328         assert(u->meta.load_state == UNIT_STUB);
 329
 330         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 331                 return r;
 332
 333         /* This is a new unit? Then let's add in some extras */
 334         if (u->meta.load_state == UNIT_LOADED) {
 335
 336                 if (have_non_accept_socket(s)) {
 337
 338                         if (!s->service)
 339                                 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
 340                                         return r;
 341
 342                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 343                                 return r;
 344                 }
 345
 346                 if ((r = socket_add_mount_links(s)) < 0)
 347                         return r;
 348
 349                 if ((r = socket_add_device_link(s)) < 0)
 350                         return r;
 351
 352                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 353                         return r;
 354
 355                 if ((r = unit_add_default_cgroups(u)) < 0)
 356                         return r;
 357
 358                 if (s->meta.default_dependencies)
 359                         if ((r = socket_add_default_dependencies(s)) < 0)
 360                                 return r;
 361         }
 362
 363         return socket_verify(s);
 364 }
 365
 366 static const char* listen_lookup(int type) {
 367
 368         if (type == SOCK_STREAM)
 369                 return "ListenStream";
 370         else if (type == SOCK_DGRAM)
 371                 return "ListenDatagram";
 372         else if (type == SOCK_SEQPACKET)
 373                 return "ListenSequentialPacket";
 374
 375         assert_not_reached("Unknown socket type");
 376         return NULL;
 377 }
 378
 379 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 380
 381         SocketExecCommand c;
 382         Socket *s = SOCKET(u);
 383         SocketPort *p;
 384         const char *prefix2;
 385         char *p2;
 386
 387         assert(s);
 388         assert(f);
 389
 390         p2 = strappend(prefix, "\t");
 391         prefix2 = p2 ? p2 : prefix;
 392
 393         fprintf(f,
 394                 "%sSocket State: %s\n"
 395                 "%sBindIPv6Only: %s\n"
 396                 "%sBacklog: %u\n"
 397                 "%sSocketMode: %04o\n"
 398                 "%sDirectoryMode: %04o\n"
 399                 "%sKeepAlive: %s\n"
 400                 "%sFreeBind: %s\n"
 401                 "%sTCPCongestion: %s\n",
 402                 prefix, socket_state_to_string(s->state),
 403                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 404                 prefix, s->backlog,
 405                 prefix, s->socket_mode,
 406                 prefix, s->directory_mode,
 407                 prefix, yes_no(s->keep_alive),
 408                 prefix, yes_no(s->free_bind),
 409                 prefix, strna(s->tcp_congestion));
 410
 411         if (s->control_pid > 0)
 412                 fprintf(f,
 413                         "%sControl PID: %lu\n",
 414                         prefix, (unsigned long) s->control_pid);
 415
 416         if (s->bind_to_device)
 417                 fprintf(f,
 418                         "%sBindToDevice: %s\n",
 419                         prefix, s->bind_to_device);
 420
 421         if (s->accept)
 422                 fprintf(f,
 423                         "%sAccepted: %u\n"
 424                         "%sNConnections: %u\n"
 425                         "%sMaxConnections: %u\n",
 426                         prefix, s->n_accepted,
 427                         prefix, s->n_connections,
 428                         prefix, s->max_connections);
 429
 430         if (s->priority >= 0)
 431                 fprintf(f,
 432                         "%sPriority: %i\n",
 433                         prefix, s->priority);
 434
 435         if (s->receive_buffer > 0)
 436                 fprintf(f,
 437                         "%sReceiveBuffer: %zu\n",
 438                         prefix, s->receive_buffer);
 439
 440         if (s->send_buffer > 0)
 441                 fprintf(f,
 442                         "%sSendBuffer: %zu\n",
 443                         prefix, s->send_buffer);
 444
 445         if (s->ip_tos >= 0)
 446                 fprintf(f,
 447                         "%sIPTOS: %i\n",
 448                         prefix, s->ip_tos);
 449
 450         if (s->ip_ttl >= 0)
 451                 fprintf(f,
 452                         "%sIPTTL: %i\n",
 453                         prefix, s->ip_ttl);
 454
 455         if (s->pipe_size > 0)
 456                 fprintf(f,
 457                         "%sPipeSize: %zu\n",
 458                         prefix, s->pipe_size);
 459
 460         if (s->mark >= 0)
 461                 fprintf(f,
 462                         "%sMark: %i\n",
 463                         prefix, s->mark);
 464
 465         LIST_FOREACH(port, p, s->ports) {
 466
 467                 if (p->type == SOCKET_SOCKET) {
 468                         const char *t;
 469                         int r;
 470                         char *k = NULL;
 471
 472                         if ((r = socket_address_print(&p->address, &k)) < 0)
 473                                 t = strerror(-r);
 474                         else
 475                                 t = k;
 476
 477                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t);
 478                         free(k);
 479                 } else
 480                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 481         }
 482
 483         exec_context_dump(&s->exec_context, f, prefix);
 484
 485         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 486                 if (!s->exec_command[c])
 487                         continue;
 488
 489                 fprintf(f, "%s-> %s:\n",
 490                         prefix, socket_exec_command_to_string(c));
 491
 492                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 493         }
 494
 495         free(p2);
 496 }
 497
 498 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 499         socklen_t l;
 500         char *r;
 501         union {
 502                 struct sockaddr sa;
 503                 struct sockaddr_un un;
 504                 struct sockaddr_in in;
 505                 struct sockaddr_in6 in6;
 506                 struct sockaddr_storage storage;
 507         } local, remote;
 508
 509         assert(fd >= 0);
 510         assert(instance);
 511
 512         l = sizeof(local);
 513         if (getsockname(fd, &local.sa, &l) < 0)
 514                 return -errno;
 515
 516         l = sizeof(remote);
 517         if (getpeername(fd, &remote.sa, &l) < 0)
 518                 return -errno;
 519
 520         switch (local.sa.sa_family) {
 521
 522         case AF_INET: {
 523                 uint32_t
 524                         a = ntohl(local.in.sin_addr.s_addr),
 525                         b = ntohl(remote.in.sin_addr.s_addr);
 526
 527                 if (asprintf(&r,
 528                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 529                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 530                              ntohs(local.in.sin_port),
 531                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 532                              ntohs(remote.in.sin_port)) < 0)
 533                         return -ENOMEM;
 534
 535                 break;
 536         }
 537
 538         case AF_INET6: {
 539                 static const char ipv4_prefix[] = {
 540                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 541                 };
 542
 543                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 544                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 545                         const uint8_t
 546                                 *a = local.in6.sin6_addr.s6_addr+12,
 547                                 *b = remote.in6.sin6_addr.s6_addr+12;
 548
 549                         if (asprintf(&r,
 550                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 551                                      a[0], a[1], a[2], a[3],
 552                                      ntohs(local.in6.sin6_port),
 553                                      b[0], b[1], b[2], b[3],
 554                                      ntohs(remote.in6.sin6_port)) < 0)
 555                                 return -ENOMEM;
 556                 } else {
 557                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 558
 559                         if (asprintf(&r,
 560                                      "%s:%u-%s:%u",
 561                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 562                                      ntohs(local.in6.sin6_port),
 563                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 564                                      ntohs(remote.in6.sin6_port)) < 0)
 565                                 return -ENOMEM;
 566                 }
 567
 568                 break;
 569         }
 570
 571         case AF_UNIX: {
 572                 struct ucred ucred;
 573
 574                 l = sizeof(ucred);
 575                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 576                         return -errno;
 577
 578                 if (asprintf(&r,
 579                              "%u-%lu-%lu",
 580                              nr,
 581                              (unsigned long) ucred.pid,
 582                              (unsigned long) ucred.uid) < 0)
 583                         return -ENOMEM;
 584
 585                 break;
 586         }
 587
 588         default:
 589                 assert_not_reached("Unhandled socket type.");
 590         }
 591
 592         *instance = r;
 593         return 0;
 594 }
 595
 596 static void socket_close_fds(Socket *s) {
 597         SocketPort *p;
 598
 599         assert(s);
 600
 601         LIST_FOREACH(port, p, s->ports) {
 602                 if (p->fd < 0)
 603                         continue;
 604
 605                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 606                 close_nointr_nofail(p->fd);
 607
 608                 /* One little note: we should never delete any sockets
 609                  * in the file system here! After all some other
 610                  * process we spawned might still have a reference of
 611                  * this fd and wants to continue to use it. Therefore
 612                  * we delete sockets in the file system before we
 613                  * create a new one, not after we stopped using
 614                  * one! */
 615
 616                 p->fd = -1;
 617         }
 618 }
 619
 620 static void socket_apply_socket_options(Socket *s, int fd) {
 621         assert(s);
 622         assert(fd >= 0);
 623
 624         if (s->keep_alive) {
 625                 int b = s->keep_alive;
 626                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 627                         log_warning("SO_KEEPALIVE failed: %m");
 628         }
 629
 630         if (s->priority >= 0)
 631                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 632                         log_warning("SO_PRIORITY failed: %m");
 633
 634         if (s->receive_buffer > 0) {
 635                 int value = (int) s->receive_buffer;
 636                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 637                         log_warning("SO_RCVBUF failed: %m");
 638         }
 639
 640         if (s->send_buffer > 0) {
 641                 int value = (int) s->send_buffer;
 642                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 643                         log_warning("SO_SNDBUF failed: %m");
 644         }
 645
 646         if (s->mark >= 0)
 647                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 648                         log_warning("SO_MARK failed: %m");
 649
 650         if (s->ip_tos >= 0)
 651                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 652                         log_warning("IP_TOS failed: %m");
 653
 654         if (s->ip_ttl >= 0) {
 655                 int r, x;
 656
 657                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 658
 659                 if (socket_ipv6_is_supported())
 660                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 661                 else {
 662                         x = -1;
 663                         errno = EAFNOSUPPORT;
 664                 }
 665
 666                 if (r < 0 && x < 0)
 667                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 668         }
 669
 670         if (s->tcp_congestion)
 671                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 672                         log_warning("TCP_CONGESTION failed: %m");
 673 }
 674
 675 static void socket_apply_fifo_options(Socket *s, int fd) {
 676         assert(s);
 677         assert(fd >= 0);
 678
 679         if (s->pipe_size > 0)
 680                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 681                         log_warning("F_SETPIPE_SZ: %m");
 682 }
 683
 684
 685 static int fifo_address_create(
 686                 const char *path,
 687                 mode_t directory_mode,
 688                 mode_t socket_mode,
 689                 int *_fd) {
 690
 691         int fd = -1, r = 0;
 692         struct stat st;
 693         mode_t old_mask;
 694
 695         assert(path);
 696         assert(_fd);
 697
 698         mkdir_parents(path, directory_mode);
 699
 700         if ((r = label_fifofile_set(path)) < 0)
 701                 goto fail;
 702
 703         /* Enforce the right access mode for the fifo */
 704         old_mask = umask(~ socket_mode);
 705
 706         /* Include the original umask in our mask */
 707         umask(~socket_mode | old_mask);
 708
 709         r = mkfifo(path, socket_mode);
 710         umask(old_mask);
 711
 712         if (r < 0) {
 713                 r = -errno;
 714                 goto fail;
 715         }
 716
 717         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 718                 r = -errno;
 719                 goto fail;
 720         }
 721
 722         label_file_clear();
 723
 724         if (fstat(fd, &st) < 0) {
 725                 r = -errno;
 726                 goto fail;
 727         }
 728
 729         if (!S_ISFIFO(st.st_mode) ||
 730             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 731             st.st_uid != getuid() ||
 732             st.st_gid != getgid()) {
 733
 734                 r = -EEXIST;
 735                 goto fail;
 736         }
 737
 738         *_fd = fd;
 739         return 0;
 740
 741 fail:
 742         label_file_clear();
 743
 744         if (fd >= 0)
 745                 close_nointr_nofail(fd);
 746
 747         return r;
 748 }
 749
 750 static int socket_open_fds(Socket *s) {
 751         SocketPort *p;
 752         int r;
 753         char *label = NULL;
 754         bool know_label = false;
 755
 756         assert(s);
 757
 758         LIST_FOREACH(port, p, s->ports) {
 759
 760                 if (p->fd >= 0)
 761                         continue;
 762
 763                 if (p->type == SOCKET_SOCKET) {
 764
 765                         if (!know_label) {
 766
 767                                 if ((r = socket_instantiate_service(s)) < 0)
 768                                         return r;
 769
 770                                 if (s->service && s->service->exec_command[SERVICE_EXEC_START])
 771                                         if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
 772                                                 return r;
 773
 774                                 know_label = true;
 775                         }
 776
 777                         if ((r = socket_address_listen(
 778                                              &p->address,
 779                                              s->backlog,
 780                                              s->bind_ipv6_only,
 781                                              s->bind_to_device,
 782                                              s->free_bind,
 783                                              s->directory_mode,
 784                                              s->socket_mode,
 785                                              label,
 786                                              &p->fd)) < 0)
 787                                 goto rollback;
 788
 789                         socket_apply_socket_options(s, p->fd);
 790
 791                 } else  if (p->type == SOCKET_FIFO) {
 792
 793                         if ((r = fifo_address_create(
 794                                              p->path,
 795                                              s->directory_mode,
 796                                              s->socket_mode,
 797                                              &p->fd)) < 0)
 798                                 goto rollback;
 799
 800                         socket_apply_fifo_options(s, p->fd);
 801
 802                 } else
 803                         assert_not_reached("Unknown port type");
 804         }
 805
 806         label_free(label);
 807         return 0;
 808
 809 rollback:
 810         socket_close_fds(s);
 811         label_free(label);
 812         return r;
 813 }
 814
 815 static void socket_unwatch_fds(Socket *s) {
 816         SocketPort *p;
 817
 818         assert(s);
 819
 820         LIST_FOREACH(port, p, s->ports) {
 821                 if (p->fd < 0)
 822                         continue;
 823
 824                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 825         }
 826 }
 827
 828 static int socket_watch_fds(Socket *s) {
 829         SocketPort *p;
 830         int r;
 831
 832         assert(s);
 833
 834         LIST_FOREACH(port, p, s->ports) {
 835                 if (p->fd < 0)
 836                         continue;
 837
 838                 p->fd_watch.socket_accept =
 839                         s->accept &&
 840                         p->type == SOCKET_SOCKET &&
 841                         socket_address_can_accept(&p->address);
 842
 843                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 844                         goto fail;
 845         }
 846
 847         return 0;
 848
 849 fail:
 850         socket_unwatch_fds(s);
 851         return r;
 852 }
 853
 854 static void socket_set_state(Socket *s, SocketState state) {
 855         SocketState old_state;
 856         assert(s);
 857
 858         old_state = s->state;
 859         s->state = state;
 860
 861         if (state != SOCKET_START_PRE &&
 862             state != SOCKET_START_POST &&
 863             state != SOCKET_STOP_PRE &&
 864             state != SOCKET_STOP_PRE_SIGTERM &&
 865             state != SOCKET_STOP_PRE_SIGKILL &&
 866             state != SOCKET_STOP_POST &&
 867             state != SOCKET_FINAL_SIGTERM &&
 868             state != SOCKET_FINAL_SIGKILL) {
 869                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 870                 socket_unwatch_control_pid(s);
 871                 s->control_command = NULL;
 872                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 873         }
 874
 875         if (state != SOCKET_LISTENING)
 876                 socket_unwatch_fds(s);
 877
 878         if (state != SOCKET_START_POST &&
 879             state != SOCKET_LISTENING &&
 880             state != SOCKET_RUNNING &&
 881             state != SOCKET_STOP_PRE &&
 882             state != SOCKET_STOP_PRE_SIGTERM &&
 883             state != SOCKET_STOP_PRE_SIGKILL)
 884                 socket_close_fds(s);
 885
 886         if (state != old_state)
 887                 log_debug("%s changed %s -> %s",
 888                           s->meta.id,
 889                           socket_state_to_string(old_state),
 890                           socket_state_to_string(state));
 891
 892         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
 893 }
 894
 895 static int socket_coldplug(Unit *u) {
 896         Socket *s = SOCKET(u);
 897         int r;
 898
 899         assert(s);
 900         assert(s->state == SOCKET_DEAD);
 901
 902         if (s->deserialized_state != s->state) {
 903
 904                 if (s->deserialized_state == SOCKET_START_PRE ||
 905                     s->deserialized_state == SOCKET_START_POST ||
 906                     s->deserialized_state == SOCKET_STOP_PRE ||
 907                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 908                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 909                     s->deserialized_state == SOCKET_STOP_POST ||
 910                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 911                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 912
 913                         if (s->control_pid <= 0)
 914                                 return -EBADMSG;
 915
 916                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 917                                 return r;
 918
 919                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 920                                 return r;
 921                 }
 922
 923                 if (s->deserialized_state == SOCKET_START_POST ||
 924                     s->deserialized_state == SOCKET_LISTENING ||
 925                     s->deserialized_state == SOCKET_RUNNING ||
 926                     s->deserialized_state == SOCKET_STOP_PRE ||
 927                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 928                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 929                         if ((r = socket_open_fds(s)) < 0)
 930                                 return r;
 931
 932                 if (s->deserialized_state == SOCKET_LISTENING)
 933                         if ((r = socket_watch_fds(s)) < 0)
 934                                 return r;
 935
 936                 socket_set_state(s, s->deserialized_state);
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 943         pid_t pid;
 944         int r;
 945         char **argv;
 946
 947         assert(s);
 948         assert(c);
 949         assert(_pid);
 950
 951         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 952                 goto fail;
 953
 954         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 955                 r = -ENOMEM;
 956                 goto fail;
 957         }
 958
 959         r = exec_spawn(c,
 960                        argv,
 961                        &s->exec_context,
 962                        NULL, 0,
 963                        s->meta.manager->environment,
 964                        true,
 965                        true,
 966                        true,
 967                        s->meta.manager->confirm_spawn,
 968                        s->meta.cgroup_bondings,
 969                        &pid);
 970
 971         strv_free(argv);
 972         if (r < 0)
 973                 goto fail;
 974
 975         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 976                 /* FIXME: we need to do something here */
 977                 goto fail;
 978
 979         *_pid = pid;
 980
 981         return 0;
 982
 983 fail:
 984         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 985
 986         return r;
 987 }
 988
 989 static void socket_enter_dead(Socket *s, bool success) {
 990         assert(s);
 991
 992         if (!success)
 993                 s->failure = true;
 994
 995         socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
 996 }
 997
 998 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 999
1000 static void socket_enter_stop_post(Socket *s, bool success) {
1001         int r;
1002         assert(s);
1003
1004         if (!success)
1005                 s->failure = true;
1006
1007         socket_unwatch_control_pid(s);
1008
1009         s->control_command_id = SOCKET_EXEC_STOP_POST;
1010
1011         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1012                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1013                         goto fail;
1014
1015                 socket_set_state(s, SOCKET_STOP_POST);
1016         } else
1017                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
1018
1019         return;
1020
1021 fail:
1022         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
1023         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1024 }
1025
1026 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1027         int r;
1028         Set *pid_set = NULL;
1029         bool wait_for_exit = false;
1030
1031         assert(s);
1032
1033         if (!success)
1034                 s->failure = true;
1035
1036         if (s->exec_context.kill_mode != KILL_NONE) {
1037                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1038
1039                 if (s->control_pid > 0) {
1040                         if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
1041                                  -s->control_pid :
1042                                  s->control_pid, sig) < 0 && errno != ESRCH)
1043
1044                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1045                         else
1046                                 wait_for_exit = true;
1047                 }
1048
1049                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1050
1051                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1052                                 r = -ENOMEM;
1053                                 goto fail;
1054                         }
1055
1056                         /* Exclude the control pid from being killed via the cgroup */
1057                         if (s->control_pid > 0)
1058                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1059                                         goto fail;
1060
1061                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) {
1062                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1063                                         log_warning("Failed to kill control group: %s", strerror(-r));
1064                         } else if (r > 0)
1065                                 wait_for_exit = true;
1066
1067                         set_free(pid_set);
1068                 }
1069         }
1070
1071         if (wait_for_exit) {
1072                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1073                         goto fail;
1074
1075                 socket_set_state(s, state);
1076         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1077                 socket_enter_stop_post(s, true);
1078         else
1079                 socket_enter_dead(s, true);
1080
1081         return;
1082
1083 fail:
1084         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1085
1086         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1087                 socket_enter_stop_post(s, false);
1088         else
1089                 socket_enter_dead(s, false);
1090
1091         if (pid_set)
1092                 set_free(pid_set);
1093 }
1094
1095 static void socket_enter_stop_pre(Socket *s, bool success) {
1096         int r;
1097         assert(s);
1098
1099         if (!success)
1100                 s->failure = true;
1101
1102         socket_unwatch_control_pid(s);
1103
1104         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1105
1106         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1107                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1108                         goto fail;
1109
1110                 socket_set_state(s, SOCKET_STOP_PRE);
1111         } else
1112                 socket_enter_stop_post(s, true);
1113
1114         return;
1115
1116 fail:
1117         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1118         socket_enter_stop_post(s, false);
1119 }
1120
1121 static void socket_enter_listening(Socket *s) {
1122         int r;
1123         assert(s);
1124
1125         if ((r = socket_watch_fds(s)) < 0) {
1126                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1127                 goto fail;
1128         }
1129
1130         socket_set_state(s, SOCKET_LISTENING);
1131         return;
1132
1133 fail:
1134         socket_enter_stop_pre(s, false);
1135 }
1136
1137 static void socket_enter_start_post(Socket *s) {
1138         int r;
1139         assert(s);
1140
1141         if ((r = socket_open_fds(s)) < 0) {
1142                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1143                 goto fail;
1144         }
1145
1146         socket_unwatch_control_pid(s);
1147
1148         s->control_command_id = SOCKET_EXEC_START_POST;
1149
1150         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1151                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1152                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1153                         goto fail;
1154                 }
1155
1156                 socket_set_state(s, SOCKET_START_POST);
1157         } else
1158                 socket_enter_listening(s);
1159
1160         return;
1161
1162 fail:
1163         socket_enter_stop_pre(s, false);
1164 }
1165
1166 static void socket_enter_start_pre(Socket *s) {
1167         int r;
1168         assert(s);
1169
1170         socket_unwatch_control_pid(s);
1171
1172         s->control_command_id = SOCKET_EXEC_START_PRE;
1173
1174         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1175                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1176                         goto fail;
1177
1178                 socket_set_state(s, SOCKET_START_PRE);
1179         } else
1180                 socket_enter_start_post(s);
1181
1182         return;
1183
1184 fail:
1185         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1186         socket_enter_dead(s, false);
1187 }
1188
1189 static void socket_enter_running(Socket *s, int cfd) {
1190         int r;
1191         DBusError error;
1192
1193         assert(s);
1194         dbus_error_init(&error);
1195
1196         /* We don't take connections anymore if we are supposed to
1197          * shut down anyway */
1198         if (unit_pending_inactive(UNIT(s))) {
1199                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", s->meta.id);
1200
1201                 if (cfd >= 0)
1202                         close_nointr_nofail(cfd);
1203                 else  {
1204                         /* Flush all sockets by closing and reopening them */
1205                         socket_close_fds(s);
1206
1207                         if ((r = socket_watch_fds(s)) < 0) {
1208                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1209                                 socket_enter_stop_pre(s, false);
1210                         }
1211                 }
1212
1213                 return;
1214         }
1215
1216         if (cfd < 0) {
1217                 bool pending = false;
1218                 Meta *i;
1219
1220                 /* If there's already a start pending don't bother to
1221                  * do anything */
1222                 LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
1223                         Service *service = (Service *) i;
1224
1225                         if (!set_get(service->configured_sockets, s))
1226                                 continue;
1227
1228                         if (!unit_pending_active(UNIT(service)))
1229                                 continue;
1230
1231                         pending = true;
1232                         break;
1233                 }
1234
1235                 if (!pending)
1236                         if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1237                                 goto fail;
1238
1239                 socket_set_state(s, SOCKET_RUNNING);
1240         } else {
1241                 char *prefix, *instance = NULL, *name;
1242                 Service *service;
1243
1244                 if (s->n_connections >= s->max_connections) {
1245                         log_warning("Too many incoming connections (%u)", s->n_connections);
1246                         close_nointr_nofail(cfd);
1247                         return;
1248                 }
1249
1250                 if ((r = socket_instantiate_service(s)) < 0)
1251                         goto fail;
1252
1253                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1254                         goto fail;
1255
1256                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1257                         free(instance);
1258                         r = -ENOMEM;
1259                         goto fail;
1260                 }
1261
1262                 name = unit_name_build(prefix, instance, ".service");
1263                 free(prefix);
1264                 free(instance);
1265
1266                 if (!name) {
1267                         r = -ENOMEM;
1268                         goto fail;
1269                 }
1270
1271                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1272                         free(name);
1273                         goto fail;
1274                 }
1275
1276                 service = s->service;
1277                 s->service = NULL;
1278                 s->n_accepted ++;
1279
1280                 service->meta.no_gc = false;
1281
1282                 unit_choose_id(UNIT(service), name);
1283                 free(name);
1284
1285                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1286                         goto fail;
1287
1288                 cfd = -1;
1289                 s->n_connections ++;
1290
1291                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1292                         goto fail;
1293
1294                 /* Notify clients about changed counters */
1295                 unit_add_to_dbus_queue(UNIT(s));
1296         }
1297
1298         return;
1299
1300 fail:
1301         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1302         socket_enter_stop_pre(s, false);
1303
1304         if (cfd >= 0)
1305                 close_nointr_nofail(cfd);
1306
1307         dbus_error_free(&error);
1308 }
1309
1310 static void socket_run_next(Socket *s, bool success) {
1311         int r;
1312
1313         assert(s);
1314         assert(s->control_command);
1315         assert(s->control_command->command_next);
1316
1317         if (!success)
1318                 s->failure = true;
1319
1320         socket_unwatch_control_pid(s);
1321
1322         s->control_command = s->control_command->command_next;
1323
1324         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1325                 goto fail;
1326
1327         return;
1328
1329 fail:
1330         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1331
1332         if (s->state == SOCKET_START_POST)
1333                 socket_enter_stop_pre(s, false);
1334         else if (s->state == SOCKET_STOP_POST)
1335                 socket_enter_dead(s, false);
1336         else
1337                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1338 }
1339
1340 static int socket_start(Unit *u) {
1341         Socket *s = SOCKET(u);
1342
1343         assert(s);
1344
1345         /* We cannot fulfill this request right now, try again later
1346          * please! */
1347         if (s->state == SOCKET_STOP_PRE ||
1348             s->state == SOCKET_STOP_PRE_SIGKILL ||
1349             s->state == SOCKET_STOP_PRE_SIGTERM ||
1350             s->state == SOCKET_STOP_POST ||
1351             s->state == SOCKET_FINAL_SIGTERM ||
1352             s->state == SOCKET_FINAL_SIGKILL)
1353                 return -EAGAIN;
1354
1355         if (s->state == SOCKET_START_PRE ||
1356             s->state == SOCKET_START_POST)
1357                 return 0;
1358
1359         /* Cannot run this without the service being around */
1360         if (s->service) {
1361                 if (s->service->meta.load_state != UNIT_LOADED)
1362                         return -ENOENT;
1363
1364                 /* If the service is alredy active we cannot start the
1365                  * socket */
1366                 if (s->service->state != SERVICE_DEAD &&
1367                     s->service->state != SERVICE_FAILED &&
1368                     s->service->state != SERVICE_AUTO_RESTART)
1369                         return -EBUSY;
1370
1371 #ifdef HAVE_SYSV_COMPAT
1372                 if (s->service->sysv_path) {
1373                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1374                         return -ENOENT;
1375                 }
1376 #endif
1377         }
1378
1379         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1380
1381         s->failure = false;
1382         socket_enter_start_pre(s);
1383         return 0;
1384 }
1385
1386 static int socket_stop(Unit *u) {
1387         Socket *s = SOCKET(u);
1388
1389         assert(s);
1390
1391         /* Already on it */
1392         if (s->state == SOCKET_STOP_PRE ||
1393             s->state == SOCKET_STOP_PRE_SIGTERM ||
1394             s->state == SOCKET_STOP_PRE_SIGKILL ||
1395             s->state == SOCKET_STOP_POST ||
1396             s->state == SOCKET_FINAL_SIGTERM ||
1397             s->state == SOCKET_FINAL_SIGKILL)
1398                 return 0;
1399
1400         /* If there's already something running we go directly into
1401          * kill mode. */
1402         if (s->state == SOCKET_START_PRE ||
1403             s->state == SOCKET_START_POST) {
1404                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1405                 return -EAGAIN;
1406         }
1407
1408         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1409
1410         socket_enter_stop_pre(s, true);
1411         return 0;
1412 }
1413
1414 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1415         Socket *s = SOCKET(u);
1416         SocketPort *p;
1417         int r;
1418
1419         assert(u);
1420         assert(f);
1421         assert(fds);
1422
1423         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1424         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1425         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1426
1427         if (s->control_pid > 0)
1428                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1429
1430         if (s->control_command_id >= 0)
1431                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1432
1433         LIST_FOREACH(port, p, s->ports) {
1434                 int copy;
1435
1436                 if (p->fd < 0)
1437                         continue;
1438
1439                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1440                         return copy;
1441
1442                 if (p->type == SOCKET_SOCKET) {
1443                         char *t;
1444
1445                         if ((r = socket_address_print(&p->address, &t)) < 0)
1446                                 return r;
1447
1448                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1449                         free(t);
1450                 } else {
1451                         assert(p->type == SOCKET_FIFO);
1452                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1453                 }
1454         }
1455
1456         return 0;
1457 }
1458
1459 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1460         Socket *s = SOCKET(u);
1461
1462         assert(u);
1463         assert(key);
1464         assert(value);
1465         assert(fds);
1466
1467         if (streq(key, "state")) {
1468                 SocketState state;
1469
1470                 if ((state = socket_state_from_string(value)) < 0)
1471                         log_debug("Failed to parse state value %s", value);
1472                 else
1473                         s->deserialized_state = state;
1474         } else if (streq(key, "failure")) {
1475                 int b;
1476
1477                 if ((b = parse_boolean(value)) < 0)
1478                         log_debug("Failed to parse failure value %s", value);
1479                 else
1480                         s->failure = b || s->failure;
1481
1482         } else if (streq(key, "n-accepted")) {
1483                 unsigned k;
1484
1485                 if (safe_atou(value, &k) < 0)
1486                         log_debug("Failed to parse n-accepted value %s", value);
1487                 else
1488                         s->n_accepted += k;
1489         } else if (streq(key, "control-pid")) {
1490                 pid_t pid;
1491
1492                 if (parse_pid(value, &pid) < 0)
1493                         log_debug("Failed to parse control-pid value %s", value);
1494                 else
1495                         s->control_pid = pid;
1496         } else if (streq(key, "control-command")) {
1497                 SocketExecCommand id;
1498
1499                 if ((id = socket_exec_command_from_string(value)) < 0)
1500                         log_debug("Failed to parse exec-command value %s", value);
1501                 else {
1502                         s->control_command_id = id;
1503                         s->control_command = s->exec_command[id];
1504                 }
1505         } else if (streq(key, "fifo")) {
1506                 int fd, skip = 0;
1507                 SocketPort *p;
1508
1509                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1510                         log_debug("Failed to parse fifo value %s", value);
1511                 else {
1512
1513                         LIST_FOREACH(port, p, s->ports)
1514                                 if (streq(p->path, value+skip))
1515                                         break;
1516
1517                         if (p) {
1518                                 if (p->fd >= 0)
1519                                         close_nointr_nofail(p->fd);
1520                                 p->fd = fdset_remove(fds, fd);
1521                         }
1522                 }
1523
1524         } else if (streq(key, "socket")) {
1525                 int fd, type, skip = 0;
1526                 SocketPort *p;
1527
1528                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1529                         log_debug("Failed to parse socket value %s", value);
1530                 else {
1531
1532                         LIST_FOREACH(port, p, s->ports)
1533                                 if (socket_address_is(&p->address, value+skip, type))
1534                                         break;
1535
1536                         if (p) {
1537                                 if (p->fd >= 0)
1538                                         close_nointr_nofail(p->fd);
1539                                 p->fd = fdset_remove(fds, fd);
1540                         }
1541                 }
1542
1543         } else
1544                 log_debug("Unknown serialization key '%s'", key);
1545
1546         return 0;
1547 }
1548
1549 static UnitActiveState socket_active_state(Unit *u) {
1550         assert(u);
1551
1552         return state_translation_table[SOCKET(u)->state];
1553 }
1554
1555 static const char *socket_sub_state_to_string(Unit *u) {
1556         assert(u);
1557
1558         return socket_state_to_string(SOCKET(u)->state);
1559 }
1560
1561 static bool socket_check_gc(Unit *u) {
1562         Socket *s = SOCKET(u);
1563
1564         assert(u);
1565
1566         return s->n_connections > 0;
1567 }
1568
1569 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1570         Socket *s = SOCKET(u);
1571         int cfd = -1;
1572
1573         assert(s);
1574         assert(fd >= 0);
1575
1576         if (s->state != SOCKET_LISTENING)
1577                 return;
1578
1579         log_debug("Incoming traffic on %s", u->meta.id);
1580
1581         if (events != EPOLLIN) {
1582                 log_error("Got invalid poll event on socket.");
1583                 goto fail;
1584         }
1585
1586         if (w->socket_accept) {
1587                 for (;;) {
1588
1589                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1590
1591                                 if (errno == EINTR)
1592                                         continue;
1593
1594                                 log_error("Failed to accept socket: %m");
1595                                 goto fail;
1596                         }
1597
1598                         break;
1599                 }
1600
1601                 socket_apply_socket_options(s, cfd);
1602         }
1603
1604         socket_enter_running(s, cfd);
1605         return;
1606
1607 fail:
1608         socket_enter_stop_pre(s, false);
1609 }
1610
1611 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1612         Socket *s = SOCKET(u);
1613         bool success;
1614
1615         assert(s);
1616         assert(pid >= 0);
1617
1618         if (pid != s->control_pid)
1619                 return;
1620
1621         s->control_pid = 0;
1622
1623         success = is_clean_exit(code, status);
1624
1625         if (s->control_command) {
1626                 exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
1627
1628                 if (s->control_command->ignore)
1629                         success = true;
1630         }
1631
1632         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1633                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1634         s->failure = s->failure || !success;
1635
1636         if (s->control_command && s->control_command->command_next && success) {
1637                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1638                 socket_run_next(s, success);
1639         } else {
1640                 s->control_command = NULL;
1641                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1642
1643                 /* No further commands for this step, so let's figure
1644                  * out what to do next */
1645
1646                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1647
1648                 switch (s->state) {
1649
1650                 case SOCKET_START_PRE:
1651                         if (success)
1652                                 socket_enter_start_post(s);
1653                         else
1654                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1655                         break;
1656
1657                 case SOCKET_START_POST:
1658                         if (success)
1659                                 socket_enter_listening(s);
1660                         else
1661                                 socket_enter_stop_pre(s, false);
1662                         break;
1663
1664                 case SOCKET_STOP_PRE:
1665                 case SOCKET_STOP_PRE_SIGTERM:
1666                 case SOCKET_STOP_PRE_SIGKILL:
1667                         socket_enter_stop_post(s, success);
1668                         break;
1669
1670                 case SOCKET_STOP_POST:
1671                 case SOCKET_FINAL_SIGTERM:
1672                 case SOCKET_FINAL_SIGKILL:
1673                         socket_enter_dead(s, success);
1674                         break;
1675
1676                 default:
1677                         assert_not_reached("Uh, control process died at wrong time.");
1678                 }
1679         }
1680
1681         /* Notify clients about changed exit status */
1682         unit_add_to_dbus_queue(u);
1683 }
1684
1685 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1686         Socket *s = SOCKET(u);
1687
1688         assert(s);
1689         assert(elapsed == 1);
1690         assert(w == &s->timer_watch);
1691
1692         switch (s->state) {
1693
1694         case SOCKET_START_PRE:
1695                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1696                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1697
1698         case SOCKET_START_POST:
1699                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1700                 socket_enter_stop_pre(s, false);
1701                 break;
1702
1703         case SOCKET_STOP_PRE:
1704                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1705                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1706                 break;
1707
1708         case SOCKET_STOP_PRE_SIGTERM:
1709                 if (s->exec_context.send_sigkill) {
1710                         log_warning("%s stopping timed out. Killing.", u->meta.id);
1711                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1712                 } else {
1713                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1714                         socket_enter_stop_post(s, false);
1715                 }
1716                 break;
1717
1718         case SOCKET_STOP_PRE_SIGKILL:
1719                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1720                 socket_enter_stop_post(s, false);
1721                 break;
1722
1723         case SOCKET_STOP_POST:
1724                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1725                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1726                 break;
1727
1728         case SOCKET_FINAL_SIGTERM:
1729                 if (s->exec_context.send_sigkill) {
1730                         log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1731                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1732                 } else {
1733                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->meta.id);
1734                         socket_enter_dead(s, false);
1735                 }
1736                 break;
1737
1738         case SOCKET_FINAL_SIGKILL:
1739                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
1740                 socket_enter_dead(s, false);
1741                 break;
1742
1743         default:
1744                 assert_not_reached("Timeout at wrong time.");
1745         }
1746 }
1747
1748 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1749         int *rfds;
1750         unsigned rn_fds, k;
1751         SocketPort *p;
1752
1753         assert(s);
1754         assert(fds);
1755         assert(n_fds);
1756
1757         /* Called from the service code for requesting our fds */
1758
1759         rn_fds = 0;
1760         LIST_FOREACH(port, p, s->ports)
1761                 if (p->fd >= 0)
1762                         rn_fds++;
1763
1764         if (!(rfds = new(int, rn_fds)))
1765                 return -ENOMEM;
1766
1767         k = 0;
1768         LIST_FOREACH(port, p, s->ports)
1769                 if (p->fd >= 0)
1770                         rfds[k++] = p->fd;
1771
1772         assert(k == rn_fds);
1773
1774         *fds = rfds;
1775         *n_fds = rn_fds;
1776
1777         return 0;
1778 }
1779
1780 void socket_notify_service_dead(Socket *s) {
1781         assert(s);
1782
1783         /* The service is dead. Dang!
1784          *
1785          * This is strictly for one-instance-for-all-connections
1786          * services. */
1787
1788         if (s->state == SOCKET_RUNNING) {
1789                 log_debug("%s got notified about service death.", s->meta.id);
1790                 socket_enter_listening(s);
1791         }
1792 }
1793
1794 void socket_connection_unref(Socket *s) {
1795         assert(s);
1796
1797         /* The service is dead. Yay!
1798          *
1799          * This is strictly for one-onstance-per-connection
1800          * services. */
1801
1802         assert(s->n_connections > 0);
1803         s->n_connections--;
1804
1805         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1806 }
1807
1808 static void socket_reset_failed(Unit *u) {
1809         Socket *s = SOCKET(u);
1810
1811         assert(s);
1812
1813         if (s->state == SOCKET_FAILED)
1814                 socket_set_state(s, SOCKET_DEAD);
1815
1816         s->failure = false;
1817 }
1818
1819 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1820         Socket *s = SOCKET(u);
1821         int r = 0;
1822         Set *pid_set = NULL;
1823
1824         assert(s);
1825
1826         if (who == KILL_MAIN) {
1827                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
1828                 return -EINVAL;
1829         }
1830
1831         if (s->control_pid <= 0 && who == KILL_CONTROL) {
1832                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1833                 return -ENOENT;
1834         }
1835
1836         if (s->control_pid > 0)
1837                 if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
1838                         r = -errno;
1839
1840         if (mode == KILL_CONTROL_GROUP) {
1841                 int q;
1842
1843                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1844                         return -ENOMEM;
1845
1846                 /* Exclude the control pid from being killed via the cgroup */
1847                 if (s->control_pid > 0)
1848                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1849                                 r = q;
1850                                 goto finish;
1851                         }
1852
1853                 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0)
1854                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1855                                 r = q;
1856         }
1857
1858 finish:
1859         if (pid_set)
1860                 set_free(pid_set);
1861
1862         return r;
1863 }
1864
1865 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1866         [SOCKET_DEAD] = "dead",
1867         [SOCKET_START_PRE] = "start-pre",
1868         [SOCKET_START_POST] = "start-post",
1869         [SOCKET_LISTENING] = "listening",
1870         [SOCKET_RUNNING] = "running",
1871         [SOCKET_STOP_PRE] = "stop-pre",
1872         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1873         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1874         [SOCKET_STOP_POST] = "stop-post",
1875         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1876         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1877         [SOCKET_FAILED] = "failed"
1878 };
1879
1880 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1881
1882 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1883         [SOCKET_EXEC_START_PRE] = "StartPre",
1884         [SOCKET_EXEC_START_POST] = "StartPost",
1885         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1886         [SOCKET_EXEC_STOP_POST] = "StopPost"
1887 };
1888
1889 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1890
1891 const UnitVTable socket_vtable = {
1892         .suffix = ".socket",
1893
1894         .init = socket_init,
1895         .done = socket_done,
1896         .load = socket_load,
1897
1898         .kill = socket_kill,
1899
1900         .coldplug = socket_coldplug,
1901
1902         .dump = socket_dump,
1903
1904         .start = socket_start,
1905         .stop = socket_stop,
1906
1907         .serialize = socket_serialize,
1908         .deserialize_item = socket_deserialize_item,
1909
1910         .active_state = socket_active_state,
1911         .sub_state_to_string = socket_sub_state_to_string,
1912
1913         .check_gc = socket_check_gc,
1914
1915         .fd_event = socket_fd_event,
1916         .sigchld_event = socket_sigchld_event,
1917         .timer_event = socket_timer_event,
1918
1919         .reset_failed = socket_reset_failed,
1920
1921         .bus_interface = "org.freedesktop.systemd1.Socket",
1922         .bus_message_handler = bus_socket_message_handler,
1923         .bus_invalidating_properties =  bus_socket_invalidating_properties
1924 };