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