src/socket.c

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