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);
 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 type) {
 370
 371         if (type == SOCK_STREAM)
 372                 return "ListenStream";
 373         else if (type == SOCK_DGRAM)
 374                 return "ListenDatagram";
 375         else if (type == SOCK_SEQPACKET)
 376                 return "ListenSequentialPacket";
 377
 378         assert_not_reached("Unknown socket type");
 379         return NULL;
 380 }
 381
 382 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 383
 384         SocketExecCommand c;
 385         Socket *s = SOCKET(u);
 386         SocketPort *p;
 387         const char *prefix2;
 388         char *p2;
 389
 390         assert(s);
 391         assert(f);
 392
 393         p2 = strappend(prefix, "\t");
 394         prefix2 = p2 ? p2 : prefix;
 395
 396         fprintf(f,
 397                 "%sSocket State: %s\n"
 398                 "%sBindIPv6Only: %s\n"
 399                 "%sBacklog: %u\n"
 400                 "%sSocketMode: %04o\n"
 401                 "%sDirectoryMode: %04o\n"
 402                 "%sKeepAlive: %s\n"
 403                 "%sFreeBind: %s\n"
 404                 "%sTCPCongestion: %s\n",
 405                 prefix, socket_state_to_string(s->state),
 406                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 407                 prefix, s->backlog,
 408                 prefix, s->socket_mode,
 409                 prefix, s->directory_mode,
 410                 prefix, yes_no(s->keep_alive),
 411                 prefix, yes_no(s->free_bind),
 412                 prefix, strna(s->tcp_congestion));
 413
 414         if (s->control_pid > 0)
 415                 fprintf(f,
 416                         "%sControl PID: %lu\n",
 417                         prefix, (unsigned long) s->control_pid);
 418
 419         if (s->bind_to_device)
 420                 fprintf(f,
 421                         "%sBindToDevice: %s\n",
 422                         prefix, s->bind_to_device);
 423
 424         if (s->accept)
 425                 fprintf(f,
 426                         "%sAccepted: %u\n"
 427                         "%sNConnections: %u\n"
 428                         "%sMaxConnections: %u\n",
 429                         prefix, s->n_accepted,
 430                         prefix, s->n_connections,
 431                         prefix, s->max_connections);
 432
 433         if (s->priority >= 0)
 434                 fprintf(f,
 435                         "%sPriority: %i\n",
 436                         prefix, s->priority);
 437
 438         if (s->receive_buffer > 0)
 439                 fprintf(f,
 440                         "%sReceiveBuffer: %zu\n",
 441                         prefix, s->receive_buffer);
 442
 443         if (s->send_buffer > 0)
 444                 fprintf(f,
 445                         "%sSendBuffer: %zu\n",
 446                         prefix, s->send_buffer);
 447
 448         if (s->ip_tos >= 0)
 449                 fprintf(f,
 450                         "%sIPTOS: %i\n",
 451                         prefix, s->ip_tos);
 452
 453         if (s->ip_ttl >= 0)
 454                 fprintf(f,
 455                         "%sIPTTL: %i\n",
 456                         prefix, s->ip_ttl);
 457
 458         if (s->pipe_size > 0)
 459                 fprintf(f,
 460                         "%sPipeSize: %zu\n",
 461                         prefix, s->pipe_size);
 462
 463         if (s->mark >= 0)
 464                 fprintf(f,
 465                         "%sMark: %i\n",
 466                         prefix, s->mark);
 467
 468         LIST_FOREACH(port, p, s->ports) {
 469
 470                 if (p->type == SOCKET_SOCKET) {
 471                         const char *t;
 472                         int r;
 473                         char *k = NULL;
 474
 475                         if ((r = socket_address_print(&p->address, &k)) < 0)
 476                                 t = strerror(-r);
 477                         else
 478                                 t = k;
 479
 480                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t);
 481                         free(k);
 482                 } else
 483                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 484         }
 485
 486         exec_context_dump(&s->exec_context, f, prefix);
 487
 488         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 489                 if (!s->exec_command[c])
 490                         continue;
 491
 492                 fprintf(f, "%s-> %s:\n",
 493                         prefix, socket_exec_command_to_string(c));
 494
 495                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 496         }
 497
 498         free(p2);
 499 }
 500
 501 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 502         socklen_t l;
 503         char *r;
 504         union {
 505                 struct sockaddr sa;
 506                 struct sockaddr_un un;
 507                 struct sockaddr_in in;
 508                 struct sockaddr_in6 in6;
 509                 struct sockaddr_storage storage;
 510         } local, remote;
 511
 512         assert(fd >= 0);
 513         assert(instance);
 514
 515         l = sizeof(local);
 516         if (getsockname(fd, &local.sa, &l) < 0)
 517                 return -errno;
 518
 519         l = sizeof(remote);
 520         if (getpeername(fd, &remote.sa, &l) < 0)
 521                 return -errno;
 522
 523         switch (local.sa.sa_family) {
 524
 525         case AF_INET: {
 526                 uint32_t
 527                         a = ntohl(local.in.sin_addr.s_addr),
 528                         b = ntohl(remote.in.sin_addr.s_addr);
 529
 530                 if (asprintf(&r,
 531                              "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 532                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 533                              ntohs(local.in.sin_port),
 534                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 535                              ntohs(remote.in.sin_port)) < 0)
 536                         return -ENOMEM;
 537
 538                 break;
 539         }
 540
 541         case AF_INET6: {
 542                 static const char ipv4_prefix[] = {
 543                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 544                 };
 545
 546                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 547                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 548                         const uint8_t
 549                                 *a = local.in6.sin6_addr.s6_addr+12,
 550                                 *b = remote.in6.sin6_addr.s6_addr+12;
 551
 552                         if (asprintf(&r,
 553                                      "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 554                                      a[0], a[1], a[2], a[3],
 555                                      ntohs(local.in6.sin6_port),
 556                                      b[0], b[1], b[2], b[3],
 557                                      ntohs(remote.in6.sin6_port)) < 0)
 558                                 return -ENOMEM;
 559                 } else {
 560                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 561
 562                         if (asprintf(&r,
 563                                      "%s:%u-%s:%u",
 564                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 565                                      ntohs(local.in6.sin6_port),
 566                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 567                                      ntohs(remote.in6.sin6_port)) < 0)
 568                                 return -ENOMEM;
 569                 }
 570
 571                 break;
 572         }
 573
 574         case AF_UNIX: {
 575                 struct ucred ucred;
 576
 577                 l = sizeof(ucred);
 578                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 579                         return -errno;
 580
 581                 if (asprintf(&r,
 582                              "%u-%lu-%lu",
 583                              nr,
 584                              (unsigned long) ucred.pid,
 585                              (unsigned long) ucred.uid) < 0)
 586                         return -ENOMEM;
 587
 588                 break;
 589         }
 590
 591         default:
 592                 assert_not_reached("Unhandled socket type.");
 593         }
 594
 595         *instance = r;
 596         return 0;
 597 }
 598
 599 static void socket_close_fds(Socket *s) {
 600         SocketPort *p;
 601
 602         assert(s);
 603
 604         LIST_FOREACH(port, p, s->ports) {
 605                 if (p->fd < 0)
 606                         continue;
 607
 608                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 609                 close_nointr_nofail(p->fd);
 610
 611                 /* One little note: we should never delete any sockets
 612                  * in the file system here! After all some other
 613                  * process we spawned might still have a reference of
 614                  * this fd and wants to continue to use it. Therefore
 615                  * we delete sockets in the file system before we
 616                  * create a new one, not after we stopped using
 617                  * one! */
 618
 619                 p->fd = -1;
 620         }
 621 }
 622
 623 static void socket_apply_socket_options(Socket *s, int fd) {
 624         assert(s);
 625         assert(fd >= 0);
 626
 627         if (s->keep_alive) {
 628                 int b = s->keep_alive;
 629                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
 630                         log_warning("SO_KEEPALIVE failed: %m");
 631         }
 632
 633         if (s->priority >= 0)
 634                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
 635                         log_warning("SO_PRIORITY failed: %m");
 636
 637         if (s->receive_buffer > 0) {
 638                 int value = (int) s->receive_buffer;
 639                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
 640                         log_warning("SO_RCVBUF failed: %m");
 641         }
 642
 643         if (s->send_buffer > 0) {
 644                 int value = (int) s->send_buffer;
 645                 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
 646                         log_warning("SO_SNDBUF failed: %m");
 647         }
 648
 649         if (s->mark >= 0)
 650                 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
 651                         log_warning("SO_MARK failed: %m");
 652
 653         if (s->ip_tos >= 0)
 654                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
 655                         log_warning("IP_TOS failed: %m");
 656
 657         if (s->ip_ttl >= 0) {
 658                 int r, x;
 659
 660                 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
 661
 662                 if (socket_ipv6_is_supported())
 663                         x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
 664                 else {
 665                         x = -1;
 666                         errno = EAFNOSUPPORT;
 667                 }
 668
 669                 if (r < 0 && x < 0)
 670                         log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
 671         }
 672
 673         if (s->tcp_congestion)
 674                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
 675                         log_warning("TCP_CONGESTION failed: %m");
 676 }
 677
 678 static void socket_apply_fifo_options(Socket *s, int fd) {
 679         assert(s);
 680         assert(fd >= 0);
 681
 682         if (s->pipe_size > 0)
 683                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
 684                         log_warning("F_SETPIPE_SZ: %m");
 685 }
 686
 687
 688 static int fifo_address_create(
 689                 const char *path,
 690                 mode_t directory_mode,
 691                 mode_t socket_mode,
 692                 int *_fd) {
 693
 694         int fd = -1, r = 0;
 695         struct stat st;
 696         mode_t old_mask;
 697
 698         assert(path);
 699         assert(_fd);
 700
 701         mkdir_parents(path, directory_mode);
 702
 703         if ((r = label_fifofile_set(path)) < 0)
 704                 goto fail;
 705
 706         /* Enforce the right access mode for the fifo */
 707         old_mask = umask(~ socket_mode);
 708
 709         /* Include the original umask in our mask */
 710         umask(~socket_mode | old_mask);
 711
 712         r = mkfifo(path, socket_mode);
 713         umask(old_mask);
 714
 715         if (r < 0) {
 716                 r = -errno;
 717                 goto fail;
 718         }
 719
 720         if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 721                 r = -errno;
 722                 goto fail;
 723         }
 724
 725         label_file_clear();
 726
 727         if (fstat(fd, &st) < 0) {
 728                 r = -errno;
 729                 goto fail;
 730         }
 731
 732         if (!S_ISFIFO(st.st_mode) ||
 733             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
 734             st.st_uid != getuid() ||
 735             st.st_gid != getgid()) {
 736
 737                 r = -EEXIST;
 738                 goto fail;
 739         }
 740
 741         *_fd = fd;
 742         return 0;
 743
 744 fail:
 745         label_file_clear();
 746
 747         if (fd >= 0)
 748                 close_nointr_nofail(fd);
 749
 750         return r;
 751 }
 752
 753 static int socket_open_fds(Socket *s) {
 754         SocketPort *p;
 755         int r;
 756         char *label = NULL;
 757         bool know_label = false;
 758
 759         assert(s);
 760
 761         LIST_FOREACH(port, p, s->ports) {
 762
 763                 if (p->fd >= 0)
 764                         continue;
 765
 766                 if (p->type == SOCKET_SOCKET) {
 767
 768                         if (!know_label) {
 769
 770                                 if ((r = socket_instantiate_service(s)) < 0)
 771                                         return r;
 772
 773                                 if (s->service && s->service->exec_command[SERVICE_EXEC_START])
 774                                         if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
 775                                                 return r;
 776
 777                                 know_label = true;
 778                         }
 779
 780                         if ((r = socket_address_listen(
 781                                              &p->address,
 782                                              s->backlog,
 783                                              s->bind_ipv6_only,
 784                                              s->bind_to_device,
 785                                              s->free_bind,
 786                                              s->directory_mode,
 787                                              s->socket_mode,
 788                                              label,
 789                                              &p->fd)) < 0)
 790                                 goto rollback;
 791
 792                         socket_apply_socket_options(s, p->fd);
 793
 794                 } else  if (p->type == SOCKET_FIFO) {
 795
 796                         if ((r = fifo_address_create(
 797                                              p->path,
 798                                              s->directory_mode,
 799                                              s->socket_mode,
 800                                              &p->fd)) < 0)
 801                                 goto rollback;
 802
 803                         socket_apply_fifo_options(s, p->fd);
 804
 805                 } else
 806                         assert_not_reached("Unknown port type");
 807         }
 808
 809         label_free(label);
 810         return 0;
 811
 812 rollback:
 813         socket_close_fds(s);
 814         label_free(label);
 815         return r;
 816 }
 817
 818 static void socket_unwatch_fds(Socket *s) {
 819         SocketPort *p;
 820
 821         assert(s);
 822
 823         LIST_FOREACH(port, p, s->ports) {
 824                 if (p->fd < 0)
 825                         continue;
 826
 827                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 828         }
 829 }
 830
 831 static int socket_watch_fds(Socket *s) {
 832         SocketPort *p;
 833         int r;
 834
 835         assert(s);
 836
 837         LIST_FOREACH(port, p, s->ports) {
 838                 if (p->fd < 0)
 839                         continue;
 840
 841                 p->fd_watch.socket_accept =
 842                         s->accept &&
 843                         p->type == SOCKET_SOCKET &&
 844                         socket_address_can_accept(&p->address);
 845
 846                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 847                         goto fail;
 848         }
 849
 850         return 0;
 851
 852 fail:
 853         socket_unwatch_fds(s);
 854         return r;
 855 }
 856
 857 static void socket_set_state(Socket *s, SocketState state) {
 858         SocketState old_state;
 859         assert(s);
 860
 861         old_state = s->state;
 862         s->state = state;
 863
 864         if (state != SOCKET_START_PRE &&
 865             state != SOCKET_START_POST &&
 866             state != SOCKET_STOP_PRE &&
 867             state != SOCKET_STOP_PRE_SIGTERM &&
 868             state != SOCKET_STOP_PRE_SIGKILL &&
 869             state != SOCKET_STOP_POST &&
 870             state != SOCKET_FINAL_SIGTERM &&
 871             state != SOCKET_FINAL_SIGKILL) {
 872                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 873                 socket_unwatch_control_pid(s);
 874                 s->control_command = NULL;
 875                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 876         }
 877
 878         if (state != SOCKET_LISTENING)
 879                 socket_unwatch_fds(s);
 880
 881         if (state != SOCKET_START_POST &&
 882             state != SOCKET_LISTENING &&
 883             state != SOCKET_RUNNING &&
 884             state != SOCKET_STOP_PRE &&
 885             state != SOCKET_STOP_PRE_SIGTERM &&
 886             state != SOCKET_STOP_PRE_SIGKILL)
 887                 socket_close_fds(s);
 888
 889         if (state != old_state)
 890                 log_debug("%s changed %s -> %s",
 891                           s->meta.id,
 892                           socket_state_to_string(old_state),
 893                           socket_state_to_string(state));
 894
 895         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
 896 }
 897
 898 static int socket_coldplug(Unit *u) {
 899         Socket *s = SOCKET(u);
 900         int r;
 901
 902         assert(s);
 903         assert(s->state == SOCKET_DEAD);
 904
 905         if (s->deserialized_state != s->state) {
 906
 907                 if (s->deserialized_state == SOCKET_START_PRE ||
 908                     s->deserialized_state == SOCKET_START_POST ||
 909                     s->deserialized_state == SOCKET_STOP_PRE ||
 910                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 911                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 912                     s->deserialized_state == SOCKET_STOP_POST ||
 913                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 914                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 915
 916                         if (s->control_pid <= 0)
 917                                 return -EBADMSG;
 918
 919                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 920                                 return r;
 921
 922                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 923                                 return r;
 924                 }
 925
 926                 if (s->deserialized_state == SOCKET_START_POST ||
 927                     s->deserialized_state == SOCKET_LISTENING ||
 928                     s->deserialized_state == SOCKET_RUNNING ||
 929                     s->deserialized_state == SOCKET_STOP_PRE ||
 930                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 931                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 932                         if ((r = socket_open_fds(s)) < 0)
 933                                 return r;
 934
 935                 if (s->deserialized_state == SOCKET_LISTENING)
 936                         if ((r = socket_watch_fds(s)) < 0)
 937                                 return r;
 938
 939                 socket_set_state(s, s->deserialized_state);
 940         }
 941
 942         return 0;
 943 }
 944
 945 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 946         pid_t pid;
 947         int r;
 948         char **argv;
 949
 950         assert(s);
 951         assert(c);
 952         assert(_pid);
 953
 954         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 955                 goto fail;
 956
 957         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 958                 r = -ENOMEM;
 959                 goto fail;
 960         }
 961
 962         r = exec_spawn(c,
 963                        argv,
 964                        &s->exec_context,
 965                        NULL, 0,
 966                        s->meta.manager->environment,
 967                        true,
 968                        true,
 969                        true,
 970                        s->meta.manager->confirm_spawn,
 971                        s->meta.cgroup_bondings,
 972                        &pid);
 973
 974         strv_free(argv);
 975         if (r < 0)
 976                 goto fail;
 977
 978         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 979                 /* FIXME: we need to do something here */
 980                 goto fail;
 981
 982         *_pid = pid;
 983
 984         return 0;
 985
 986 fail:
 987         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 988
 989         return r;
 990 }
 991
 992 static void socket_enter_dead(Socket *s, bool success) {
 993         assert(s);
 994
 995         if (!success)
 996                 s->failure = true;
 997
 998         socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
 999 }
1000
1001 static void socket_enter_signal(Socket *s, SocketState state, bool success);
1002
1003 static void socket_enter_stop_post(Socket *s, bool success) {
1004         int r;
1005         assert(s);
1006
1007         if (!success)
1008                 s->failure = true;
1009
1010         socket_unwatch_control_pid(s);
1011
1012         s->control_command_id = SOCKET_EXEC_STOP_POST;
1013
1014         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
1015                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1016                         goto fail;
1017
1018                 socket_set_state(s, SOCKET_STOP_POST);
1019         } else
1020                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
1021
1022         return;
1023
1024 fail:
1025         log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
1026         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1027 }
1028
1029 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1030         int r;
1031         Set *pid_set = NULL;
1032         bool wait_for_exit = false;
1033
1034         assert(s);
1035
1036         if (!success)
1037                 s->failure = true;
1038
1039         if (s->exec_context.kill_mode != KILL_NONE) {
1040                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1041
1042                 if (s->control_pid > 0) {
1043                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
1044
1045                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1046                         else
1047                                 wait_for_exit = true;
1048                 }
1049
1050                 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1051
1052                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1053                                 r = -ENOMEM;
1054                                 goto fail;
1055                         }
1056
1057                         /* Exclude the control pid from being killed via the cgroup */
1058                         if (s->control_pid > 0)
1059                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1060                                         goto fail;
1061
1062                         if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
1063                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1064                                         log_warning("Failed to kill control group: %s", strerror(-r));
1065                         } else if (r > 0)
1066                                 wait_for_exit = true;
1067
1068                         set_free(pid_set);
1069                 }
1070         }
1071
1072         if (wait_for_exit) {
1073                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1074                         goto fail;
1075
1076                 socket_set_state(s, state);
1077         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1078                 socket_enter_stop_post(s, true);
1079         else
1080                 socket_enter_dead(s, true);
1081
1082         return;
1083
1084 fail:
1085         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1086
1087         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1088                 socket_enter_stop_post(s, false);
1089         else
1090                 socket_enter_dead(s, false);
1091
1092         if (pid_set)
1093                 set_free(pid_set);
1094 }
1095
1096 static void socket_enter_stop_pre(Socket *s, bool success) {
1097         int r;
1098         assert(s);
1099
1100         if (!success)
1101                 s->failure = true;
1102
1103         socket_unwatch_control_pid(s);
1104
1105         s->control_command_id = SOCKET_EXEC_STOP_PRE;
1106
1107         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1108                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1109                         goto fail;
1110
1111                 socket_set_state(s, SOCKET_STOP_PRE);
1112         } else
1113                 socket_enter_stop_post(s, true);
1114
1115         return;
1116
1117 fail:
1118         log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1119         socket_enter_stop_post(s, false);
1120 }
1121
1122 static void socket_enter_listening(Socket *s) {
1123         int r;
1124         assert(s);
1125
1126         if ((r = socket_watch_fds(s)) < 0) {
1127                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1128                 goto fail;
1129         }
1130
1131         socket_set_state(s, SOCKET_LISTENING);
1132         return;
1133
1134 fail:
1135         socket_enter_stop_pre(s, false);
1136 }
1137
1138 static void socket_enter_start_post(Socket *s) {
1139         int r;
1140         assert(s);
1141
1142         if ((r = socket_open_fds(s)) < 0) {
1143                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1144                 goto fail;
1145         }
1146
1147         socket_unwatch_control_pid(s);
1148
1149         s->control_command_id = SOCKET_EXEC_START_POST;
1150
1151         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1152                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1153                         log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1154                         goto fail;
1155                 }
1156
1157                 socket_set_state(s, SOCKET_START_POST);
1158         } else
1159                 socket_enter_listening(s);
1160
1161         return;
1162
1163 fail:
1164         socket_enter_stop_pre(s, false);
1165 }
1166
1167 static void socket_enter_start_pre(Socket *s) {
1168         int r;
1169         assert(s);
1170
1171         socket_unwatch_control_pid(s);
1172
1173         s->control_command_id = SOCKET_EXEC_START_PRE;
1174
1175         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1176                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1177                         goto fail;
1178
1179                 socket_set_state(s, SOCKET_START_PRE);
1180         } else
1181                 socket_enter_start_post(s);
1182
1183         return;
1184
1185 fail:
1186         log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1187         socket_enter_dead(s, false);
1188 }
1189
1190 static void socket_enter_running(Socket *s, int cfd) {
1191         int r;
1192         DBusError error;
1193
1194         assert(s);
1195         dbus_error_init(&error);
1196
1197         /* We don't take connections anymore if we are supposed to
1198          * shut down anyway */
1199         if (unit_pending_inactive(UNIT(s))) {
1200                 log_debug("Suppressing connection request on %s since unit stop is scheduled.", s->meta.id);
1201
1202                 if (cfd >= 0)
1203                         close_nointr_nofail(cfd);
1204                 else  {
1205                         /* Flush all sockets by closing and reopening them */
1206                         socket_close_fds(s);
1207
1208                         if ((r = socket_watch_fds(s)) < 0) {
1209                                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1210                                 socket_enter_stop_pre(s, false);
1211                         }
1212                 }
1213
1214                 return;
1215         }
1216
1217         if (cfd < 0) {
1218                 bool pending = false;
1219                 Meta *i;
1220
1221                 /* If there's already a start pending don't bother to
1222                  * do anything */
1223                 LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
1224                         Service *service = (Service *) i;
1225
1226                         if (!set_get(service->configured_sockets, s))
1227                                 continue;
1228
1229                         if (!unit_pending_active(UNIT(service)))
1230                                 continue;
1231
1232                         pending = true;
1233                         break;
1234                 }
1235
1236                 if (!pending)
1237                         if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1238                                 goto fail;
1239
1240                 socket_set_state(s, SOCKET_RUNNING);
1241         } else {
1242                 char *prefix, *instance = NULL, *name;
1243                 Service *service;
1244
1245                 if (s->n_connections >= s->max_connections) {
1246                         log_warning("Too many incoming connections (%u)", s->n_connections);
1247                         close_nointr_nofail(cfd);
1248                         return;
1249                 }
1250
1251                 if ((r = socket_instantiate_service(s)) < 0)
1252                         goto fail;
1253
1254                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1255                         goto fail;
1256
1257                 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1258                         free(instance);
1259                         r = -ENOMEM;
1260                         goto fail;
1261                 }
1262
1263                 name = unit_name_build(prefix, instance, ".service");
1264                 free(prefix);
1265                 free(instance);
1266
1267                 if (!name) {
1268                         r = -ENOMEM;
1269                         goto fail;
1270                 }
1271
1272                 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1273                         free(name);
1274                         goto fail;
1275                 }
1276
1277                 service = s->service;
1278                 s->service = NULL;
1279                 s->n_accepted ++;
1280
1281                 service->meta.no_gc = false;
1282
1283                 unit_choose_id(UNIT(service), name);
1284                 free(name);
1285
1286                 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1287                         goto fail;
1288
1289                 cfd = -1;
1290                 s->n_connections ++;
1291
1292                 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1293                         goto fail;
1294
1295                 /* Notify clients about changed counters */
1296                 unit_add_to_dbus_queue(UNIT(s));
1297         }
1298
1299         return;
1300
1301 fail:
1302         log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1303         socket_enter_stop_pre(s, false);
1304
1305         if (cfd >= 0)
1306                 close_nointr_nofail(cfd);
1307
1308         dbus_error_free(&error);
1309 }
1310
1311 static void socket_run_next(Socket *s, bool success) {
1312         int r;
1313
1314         assert(s);
1315         assert(s->control_command);
1316         assert(s->control_command->command_next);
1317
1318         if (!success)
1319                 s->failure = true;
1320
1321         socket_unwatch_control_pid(s);
1322
1323         s->control_command = s->control_command->command_next;
1324
1325         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1326                 goto fail;
1327
1328         return;
1329
1330 fail:
1331         log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1332
1333         if (s->state == SOCKET_START_POST)
1334                 socket_enter_stop_pre(s, false);
1335         else if (s->state == SOCKET_STOP_POST)
1336                 socket_enter_dead(s, false);
1337         else
1338                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1339 }
1340
1341 static int socket_start(Unit *u) {
1342         Socket *s = SOCKET(u);
1343
1344         assert(s);
1345
1346         /* We cannot fulfill this request right now, try again later
1347          * please! */
1348         if (s->state == SOCKET_STOP_PRE ||
1349             s->state == SOCKET_STOP_PRE_SIGKILL ||
1350             s->state == SOCKET_STOP_PRE_SIGTERM ||
1351             s->state == SOCKET_STOP_POST ||
1352             s->state == SOCKET_FINAL_SIGTERM ||
1353             s->state == SOCKET_FINAL_SIGKILL)
1354                 return -EAGAIN;
1355
1356         if (s->state == SOCKET_START_PRE ||
1357             s->state == SOCKET_START_POST)
1358                 return 0;
1359
1360         /* Cannot run this without the service being around */
1361         if (s->service) {
1362                 if (s->service->meta.load_state != UNIT_LOADED)
1363                         return -ENOENT;
1364
1365                 /* If the service is already active we cannot start the
1366                  * socket */
1367                 if (s->service->state != SERVICE_DEAD &&
1368                     s->service->state != SERVICE_FAILED &&
1369                     s->service->state != SERVICE_AUTO_RESTART)
1370                         return -EBUSY;
1371
1372 #ifdef HAVE_SYSV_COMPAT
1373                 if (s->service->sysv_path) {
1374                         log_error("Using SysV services for socket activation is not supported. Refusing.");
1375                         return -ENOENT;
1376                 }
1377 #endif
1378         }
1379
1380         assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1381
1382         s->failure = false;
1383         socket_enter_start_pre(s);
1384         return 0;
1385 }
1386
1387 static int socket_stop(Unit *u) {
1388         Socket *s = SOCKET(u);
1389
1390         assert(s);
1391
1392         /* Already on it */
1393         if (s->state == SOCKET_STOP_PRE ||
1394             s->state == SOCKET_STOP_PRE_SIGTERM ||
1395             s->state == SOCKET_STOP_PRE_SIGKILL ||
1396             s->state == SOCKET_STOP_POST ||
1397             s->state == SOCKET_FINAL_SIGTERM ||
1398             s->state == SOCKET_FINAL_SIGKILL)
1399                 return 0;
1400
1401         /* If there's already something running we go directly into
1402          * kill mode. */
1403         if (s->state == SOCKET_START_PRE ||
1404             s->state == SOCKET_START_POST) {
1405                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1406                 return -EAGAIN;
1407         }
1408
1409         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1410
1411         socket_enter_stop_pre(s, true);
1412         return 0;
1413 }
1414
1415 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1416         Socket *s = SOCKET(u);
1417         SocketPort *p;
1418         int r;
1419
1420         assert(u);
1421         assert(f);
1422         assert(fds);
1423
1424         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1425         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1426         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1427
1428         if (s->control_pid > 0)
1429                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1430
1431         if (s->control_command_id >= 0)
1432                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1433
1434         LIST_FOREACH(port, p, s->ports) {
1435                 int copy;
1436
1437                 if (p->fd < 0)
1438                         continue;
1439
1440                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1441                         return copy;
1442
1443                 if (p->type == SOCKET_SOCKET) {
1444                         char *t;
1445
1446                         if ((r = socket_address_print(&p->address, &t)) < 0)
1447                                 return r;
1448
1449                         unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1450                         free(t);
1451                 } else {
1452                         assert(p->type == SOCKET_FIFO);
1453                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1454                 }
1455         }
1456
1457         return 0;
1458 }
1459
1460 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1461         Socket *s = SOCKET(u);
1462
1463         assert(u);
1464         assert(key);
1465         assert(value);
1466         assert(fds);
1467
1468         if (streq(key, "state")) {
1469                 SocketState state;
1470
1471                 if ((state = socket_state_from_string(value)) < 0)
1472                         log_debug("Failed to parse state value %s", value);
1473                 else
1474                         s->deserialized_state = state;
1475         } else if (streq(key, "failure")) {
1476                 int b;
1477
1478                 if ((b = parse_boolean(value)) < 0)
1479                         log_debug("Failed to parse failure value %s", value);
1480                 else
1481                         s->failure = b || s->failure;
1482
1483         } else if (streq(key, "n-accepted")) {
1484                 unsigned k;
1485
1486                 if (safe_atou(value, &k) < 0)
1487                         log_debug("Failed to parse n-accepted value %s", value);
1488                 else
1489                         s->n_accepted += k;
1490         } else if (streq(key, "control-pid")) {
1491                 pid_t pid;
1492
1493                 if (parse_pid(value, &pid) < 0)
1494                         log_debug("Failed to parse control-pid value %s", value);
1495                 else
1496                         s->control_pid = pid;
1497         } else if (streq(key, "control-command")) {
1498                 SocketExecCommand id;
1499
1500                 if ((id = socket_exec_command_from_string(value)) < 0)
1501                         log_debug("Failed to parse exec-command value %s", value);
1502                 else {
1503                         s->control_command_id = id;
1504                         s->control_command = s->exec_command[id];
1505                 }
1506         } else if (streq(key, "fifo")) {
1507                 int fd, skip = 0;
1508                 SocketPort *p;
1509
1510                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1511                         log_debug("Failed to parse fifo value %s", value);
1512                 else {
1513
1514                         LIST_FOREACH(port, p, s->ports)
1515                                 if (streq(p->path, value+skip))
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 if (streq(key, "socket")) {
1526                 int fd, type, skip = 0;
1527                 SocketPort *p;
1528
1529                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1530                         log_debug("Failed to parse socket value %s", value);
1531                 else {
1532
1533                         LIST_FOREACH(port, p, s->ports)
1534                                 if (socket_address_is(&p->address, value+skip, type))
1535                                         break;
1536
1537                         if (p) {
1538                                 if (p->fd >= 0)
1539                                         close_nointr_nofail(p->fd);
1540                                 p->fd = fdset_remove(fds, fd);
1541                         }
1542                 }
1543
1544         } else
1545                 log_debug("Unknown serialization key '%s'", key);
1546
1547         return 0;
1548 }
1549
1550 static UnitActiveState socket_active_state(Unit *u) {
1551         assert(u);
1552
1553         return state_translation_table[SOCKET(u)->state];
1554 }
1555
1556 static const char *socket_sub_state_to_string(Unit *u) {
1557         assert(u);
1558
1559         return socket_state_to_string(SOCKET(u)->state);
1560 }
1561
1562 static bool socket_check_gc(Unit *u) {
1563         Socket *s = SOCKET(u);
1564
1565         assert(u);
1566
1567         return s->n_connections > 0;
1568 }
1569
1570 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1571         Socket *s = SOCKET(u);
1572         int cfd = -1;
1573
1574         assert(s);
1575         assert(fd >= 0);
1576
1577         if (s->state != SOCKET_LISTENING)
1578                 return;
1579
1580         log_debug("Incoming traffic on %s", u->meta.id);
1581
1582         if (events != EPOLLIN) {
1583                 log_error("Got invalid poll event on socket.");
1584                 goto fail;
1585         }
1586
1587         if (w->socket_accept) {
1588                 for (;;) {
1589
1590                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1591
1592                                 if (errno == EINTR)
1593                                         continue;
1594
1595                                 log_error("Failed to accept socket: %m");
1596                                 goto fail;
1597                         }
1598
1599                         break;
1600                 }
1601
1602                 socket_apply_socket_options(s, cfd);
1603         }
1604
1605         socket_enter_running(s, cfd);
1606         return;
1607
1608 fail:
1609         socket_enter_stop_pre(s, false);
1610 }
1611
1612 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1613         Socket *s = SOCKET(u);
1614         bool success;
1615
1616         assert(s);
1617         assert(pid >= 0);
1618
1619         if (pid != s->control_pid)
1620                 return;
1621
1622         s->control_pid = 0;
1623
1624         success = is_clean_exit(code, status);
1625
1626         if (s->control_command) {
1627                 exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
1628
1629                 if (s->control_command->ignore)
1630                         success = true;
1631         }
1632
1633         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1634                  "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1635         s->failure = s->failure || !success;
1636
1637         if (s->control_command && s->control_command->command_next && success) {
1638                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1639                 socket_run_next(s, success);
1640         } else {
1641                 s->control_command = NULL;
1642                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1643
1644                 /* No further commands for this step, so let's figure
1645                  * out what to do next */
1646
1647                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1648
1649                 switch (s->state) {
1650
1651                 case SOCKET_START_PRE:
1652                         if (success)
1653                                 socket_enter_start_post(s);
1654                         else
1655                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1656                         break;
1657
1658                 case SOCKET_START_POST:
1659                         if (success)
1660                                 socket_enter_listening(s);
1661                         else
1662                                 socket_enter_stop_pre(s, false);
1663                         break;
1664
1665                 case SOCKET_STOP_PRE:
1666                 case SOCKET_STOP_PRE_SIGTERM:
1667                 case SOCKET_STOP_PRE_SIGKILL:
1668                         socket_enter_stop_post(s, success);
1669                         break;
1670
1671                 case SOCKET_STOP_POST:
1672                 case SOCKET_FINAL_SIGTERM:
1673                 case SOCKET_FINAL_SIGKILL:
1674                         socket_enter_dead(s, success);
1675                         break;
1676
1677                 default:
1678                         assert_not_reached("Uh, control process died at wrong time.");
1679                 }
1680         }
1681
1682         /* Notify clients about changed exit status */
1683         unit_add_to_dbus_queue(u);
1684 }
1685
1686 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1687         Socket *s = SOCKET(u);
1688
1689         assert(s);
1690         assert(elapsed == 1);
1691         assert(w == &s->timer_watch);
1692
1693         switch (s->state) {
1694
1695         case SOCKET_START_PRE:
1696                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1697                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1698
1699         case SOCKET_START_POST:
1700                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1701                 socket_enter_stop_pre(s, false);
1702                 break;
1703
1704         case SOCKET_STOP_PRE:
1705                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1706                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1707                 break;
1708
1709         case SOCKET_STOP_PRE_SIGTERM:
1710                 if (s->exec_context.send_sigkill) {
1711                         log_warning("%s stopping timed out. Killing.", u->meta.id);
1712                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1713                 } else {
1714                         log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1715                         socket_enter_stop_post(s, false);
1716                 }
1717                 break;
1718
1719         case SOCKET_STOP_PRE_SIGKILL:
1720                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1721                 socket_enter_stop_post(s, false);
1722                 break;
1723
1724         case SOCKET_STOP_POST:
1725                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1726                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1727                 break;
1728
1729         case SOCKET_FINAL_SIGTERM:
1730                 if (s->exec_context.send_sigkill) {
1731                         log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1732                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1733                 } else {
1734                         log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->meta.id);
1735                         socket_enter_dead(s, false);
1736                 }
1737                 break;
1738
1739         case SOCKET_FINAL_SIGKILL:
1740                 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
1741                 socket_enter_dead(s, false);
1742                 break;
1743
1744         default:
1745                 assert_not_reached("Timeout at wrong time.");
1746         }
1747 }
1748
1749 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1750         int *rfds;
1751         unsigned rn_fds, k;
1752         SocketPort *p;
1753
1754         assert(s);
1755         assert(fds);
1756         assert(n_fds);
1757
1758         /* Called from the service code for requesting our fds */
1759
1760         rn_fds = 0;
1761         LIST_FOREACH(port, p, s->ports)
1762                 if (p->fd >= 0)
1763                         rn_fds++;
1764
1765         if (!(rfds = new(int, rn_fds)))
1766                 return -ENOMEM;
1767
1768         k = 0;
1769         LIST_FOREACH(port, p, s->ports)
1770                 if (p->fd >= 0)
1771                         rfds[k++] = p->fd;
1772
1773         assert(k == rn_fds);
1774
1775         *fds = rfds;
1776         *n_fds = rn_fds;
1777
1778         return 0;
1779 }
1780
1781 void socket_notify_service_dead(Socket *s) {
1782         assert(s);
1783
1784         /* The service is dead. Dang!
1785          *
1786          * This is strictly for one-instance-for-all-connections
1787          * services. */
1788
1789         if (s->state == SOCKET_RUNNING) {
1790                 log_debug("%s got notified about service death.", s->meta.id);
1791                 socket_enter_listening(s);
1792         }
1793 }
1794
1795 void socket_connection_unref(Socket *s) {
1796         assert(s);
1797
1798         /* The service is dead. Yay!
1799          *
1800          * This is strictly for one-instance-per-connection
1801          * services. */
1802
1803         assert(s->n_connections > 0);
1804         s->n_connections--;
1805
1806         log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1807 }
1808
1809 static void socket_reset_failed(Unit *u) {
1810         Socket *s = SOCKET(u);
1811
1812         assert(s);
1813
1814         if (s->state == SOCKET_FAILED)
1815                 socket_set_state(s, SOCKET_DEAD);
1816
1817         s->failure = false;
1818 }
1819
1820 static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1821         Socket *s = SOCKET(u);
1822         int r = 0;
1823         Set *pid_set = NULL;
1824
1825         assert(s);
1826
1827         if (who == KILL_MAIN) {
1828                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
1829                 return -EINVAL;
1830         }
1831
1832         if (s->control_pid <= 0 && who == KILL_CONTROL) {
1833                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1834                 return -ENOENT;
1835         }
1836
1837         if (s->control_pid > 0)
1838                 if (kill(s->control_pid, signo) < 0)
1839                         r = -errno;
1840
1841         if (mode == KILL_CONTROL_GROUP) {
1842                 int q;
1843
1844                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1845                         return -ENOMEM;
1846
1847                 /* Exclude the control pid from being killed via the cgroup */
1848                 if (s->control_pid > 0)
1849                         if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1850                                 r = q;
1851                                 goto finish;
1852                         }
1853
1854                 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1855                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1856                                 r = q;
1857         }
1858
1859 finish:
1860         if (pid_set)
1861                 set_free(pid_set);
1862
1863         return r;
1864 }
1865
1866 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1867         [SOCKET_DEAD] = "dead",
1868         [SOCKET_START_PRE] = "start-pre",
1869         [SOCKET_START_POST] = "start-post",
1870         [SOCKET_LISTENING] = "listening",
1871         [SOCKET_RUNNING] = "running",
1872         [SOCKET_STOP_PRE] = "stop-pre",
1873         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1874         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1875         [SOCKET_STOP_POST] = "stop-post",
1876         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1877         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1878         [SOCKET_FAILED] = "failed"
1879 };
1880
1881 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1882
1883 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1884         [SOCKET_EXEC_START_PRE] = "StartPre",
1885         [SOCKET_EXEC_START_POST] = "StartPost",
1886         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1887         [SOCKET_EXEC_STOP_POST] = "StopPost"
1888 };
1889
1890 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1891
1892 const UnitVTable socket_vtable = {
1893         .suffix = ".socket",
1894
1895         .init = socket_init,
1896         .done = socket_done,
1897         .load = socket_load,
1898
1899         .kill = socket_kill,
1900
1901         .coldplug = socket_coldplug,
1902
1903         .dump = socket_dump,
1904
1905         .start = socket_start,
1906         .stop = socket_stop,
1907
1908         .serialize = socket_serialize,
1909         .deserialize_item = socket_deserialize_item,
1910
1911         .active_state = socket_active_state,
1912         .sub_state_to_string = socket_sub_state_to_string,
1913
1914         .check_gc = socket_check_gc,
1915
1916         .fd_event = socket_fd_event,
1917         .sigchld_event = socket_sigchld_event,
1918         .timer_event = socket_timer_event,
1919
1920         .reset_failed = socket_reset_failed,
1921
1922         .bus_interface = "org.freedesktop.systemd1.Socket",
1923         .bus_message_handler = bus_socket_message_handler,
1924         .bus_invalidating_properties =  bus_socket_invalidating_properties
1925 };