src/socket.c

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