src/socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29 #include <arpa/inet.h>
  30
  31 #include "unit.h"
  32 #include "socket.h"
  33 #include "log.h"
  34 #include "load-dropin.h"
  35 #include "load-fragment.h"
  36 #include "strv.h"
  37 #include "unit-name.h"
  38 #include "dbus-socket.h"
  39
  40 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  41         [SOCKET_DEAD] = UNIT_INACTIVE,
  42         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  43         [SOCKET_START_POST] = UNIT_ACTIVATING,
  44         [SOCKET_LISTENING] = UNIT_ACTIVE,
  45         [SOCKET_RUNNING] = UNIT_ACTIVE,
  46         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  47         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  48         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  49         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  50         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  51         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  52         [SOCKET_MAINTAINANCE] = UNIT_INACTIVE,
  53 };
  54
  55 static void socket_init(Unit *u) {
  56         Socket *s = SOCKET(u);
  57
  58         assert(u);
  59         assert(u->meta.load_state == UNIT_STUB);
  60
  61         s->timer_watch.type = WATCH_INVALID;
  62         s->backlog = SOMAXCONN;
  63         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  64         s->directory_mode = 0755;
  65         s->socket_mode = 0666;
  66
  67         exec_context_init(&s->exec_context);
  68
  69         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
  70 }
  71
  72 static void socket_unwatch_control_pid(Socket *s) {
  73         assert(s);
  74
  75         if (s->control_pid <= 0)
  76                 return;
  77
  78         unit_unwatch_pid(UNIT(s), s->control_pid);
  79         s->control_pid = 0;
  80 }
  81
  82 static void socket_done(Unit *u) {
  83         Socket *s = SOCKET(u);
  84         SocketPort *p;
  85
  86         assert(s);
  87
  88         while ((p = s->ports)) {
  89                 LIST_REMOVE(SocketPort, port, s->ports, p);
  90
  91                 if (p->fd >= 0) {
  92                         unit_unwatch_fd(UNIT(s), &p->fd_watch);
  93                         close_nointr_nofail(p->fd);
  94                 }
  95
  96                 free(p->path);
  97                 free(p);
  98         }
  99
 100         exec_context_done(&s->exec_context);
 101         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 102         s->control_command = NULL;
 103
 104         socket_unwatch_control_pid(s);
 105
 106         s->service = NULL;
 107
 108         free(s->bind_to_device);
 109         s->bind_to_device = NULL;
 110
 111         unit_unwatch_timer(u, &s->timer_watch);
 112 }
 113
 114 static bool have_non_accept_socket(Socket *s) {
 115         SocketPort *p;
 116
 117         assert(s);
 118
 119         if (!s->accept)
 120                 return true;
 121
 122         LIST_FOREACH(port, p, s->ports) {
 123
 124                 if (p->type != SOCKET_SOCKET)
 125                         return true;
 126
 127                 if (!socket_address_can_accept(&p->address))
 128                         return true;
 129         }
 130
 131         return false;
 132 }
 133
 134 static int socket_verify(Socket *s) {
 135         assert(s);
 136
 137         if (UNIT(s)->meta.load_state != UNIT_LOADED)
 138                 return 0;
 139
 140         if (!s->ports) {
 141                 log_error("%s lacks Listen setting. Refusing.", UNIT(s)->meta.id);
 142                 return -EINVAL;
 143         }
 144
 145         return 0;
 146 }
 147
 148 static bool socket_needs_mount(Socket *s, const char *prefix) {
 149         SocketPort *p;
 150
 151         assert(s);
 152
 153         LIST_FOREACH(port, p, s->ports) {
 154
 155                 if (p->type == SOCKET_SOCKET) {
 156                         if (socket_address_needs_mount(&p->address, prefix))
 157                                 return true;
 158                 } else {
 159                         assert(p->type == SOCKET_FIFO);
 160                         if (path_startswith(p->path, prefix))
 161                                 return true;
 162                 }
 163         }
 164
 165         return false;
 166 }
 167
 168 int socket_add_one_mount_link(Socket *s, Mount *m) {
 169         int r;
 170
 171         assert(s);
 172         assert(m);
 173
 174         if (s->meta.load_state != UNIT_LOADED ||
 175             m->meta.load_state != UNIT_LOADED)
 176                 return 0;
 177
 178         if (!socket_needs_mount(s, m->where))
 179                 return 0;
 180
 181         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(s), true)) < 0)
 182                 return r;
 183
 184         if ((r = unit_add_dependency(UNIT(s), UNIT_REQUIRES, UNIT(m), true)) < 0)
 185                 return r;
 186
 187         return 0;
 188 }
 189
 190 static int socket_add_mount_links(Socket *s) {
 191         Meta *other;
 192         int r;
 193
 194         assert(s);
 195
 196         LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
 197                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
 198                         return r;
 199
 200         return 0;
 201 }
 202
 203 static int socket_add_device_link(Socket *s) {
 204         char *t;
 205         int r;
 206
 207         assert(s);
 208
 209         if (!s->bind_to_device)
 210                 return 0;
 211
 212         if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
 213                 return -ENOMEM;
 214
 215         r = unit_add_node_link(UNIT(s), t, false);
 216         free(t);
 217
 218         return r;
 219 }
 220
 221 static int socket_load(Unit *u) {
 222         Socket *s = SOCKET(u);
 223         int r;
 224
 225         assert(u);
 226         assert(u->meta.load_state == UNIT_STUB);
 227
 228         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 229                 return r;
 230
 231         /* This is a new unit? Then let's add in some extras */
 232         if (u->meta.load_state == UNIT_LOADED) {
 233
 234                 if (have_non_accept_socket(s)) {
 235                         if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)))
 236                                 return r;
 237
 238                         if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
 239                                 return r;
 240                 }
 241
 242                 if ((r = socket_add_mount_links(s)) < 0)
 243                         return r;
 244
 245                 if ((r = socket_add_device_link(s)) < 0)
 246                         return r;
 247
 248                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 249                         return r;
 250
 251                 if ((r = unit_add_default_cgroup(u)) < 0)
 252                         return r;
 253         }
 254
 255         return socket_verify(s);
 256 }
 257
 258 static const char* listen_lookup(int type) {
 259
 260         if (type == SOCK_STREAM)
 261                 return "ListenStream";
 262         else if (type == SOCK_DGRAM)
 263                 return "ListenDatagram";
 264         else if (type == SOCK_SEQPACKET)
 265                 return "ListenSequentialPacket";
 266
 267         assert_not_reached("Unknown socket type");
 268         return NULL;
 269 }
 270
 271 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 272
 273         SocketExecCommand c;
 274         Socket *s = SOCKET(u);
 275         SocketPort *p;
 276         const char *prefix2;
 277         char *p2;
 278
 279         assert(s);
 280         assert(f);
 281
 282         p2 = strappend(prefix, "\t");
 283         prefix2 = p2 ? p2 : prefix;
 284
 285         fprintf(f,
 286                 "%sSocket State: %s\n"
 287                 "%sBindIPv6Only: %s\n"
 288                 "%sBacklog: %u\n"
 289                 "%sKillMode: %s\n"
 290                 "%sSocketMode: %04o\n"
 291                 "%sDirectoryMode: %04o\n",
 292                 prefix, socket_state_to_string(s->state),
 293                 prefix, yes_no(s->bind_ipv6_only),
 294                 prefix, s->backlog,
 295                 prefix, kill_mode_to_string(s->kill_mode),
 296                 prefix, s->socket_mode,
 297                 prefix, s->directory_mode);
 298
 299         if (s->control_pid > 0)
 300                 fprintf(f,
 301                         "%sControl PID: %llu\n",
 302                         prefix, (unsigned long long) s->control_pid);
 303
 304         if (s->bind_to_device)
 305                 fprintf(f,
 306                         "%sBindToDevice: %s\n",
 307                         prefix, s->bind_to_device);
 308
 309         if (s->accept)
 310                 fprintf(f,
 311                         "%sAccepted: %u\n",
 312                         prefix, s->n_accepted);
 313
 314         LIST_FOREACH(port, p, s->ports) {
 315
 316                 if (p->type == SOCKET_SOCKET) {
 317                         const char *t;
 318                         int r;
 319                         char *k;
 320
 321                         if ((r = socket_address_print(&p->address, &k)) < 0)
 322                                 t = strerror(-r);
 323                         else
 324                                 t = k;
 325
 326                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 327                         free(k);
 328                 } else
 329                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 330         }
 331
 332         exec_context_dump(&s->exec_context, f, prefix);
 333
 334         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 335                 if (!s->exec_command[c])
 336                         continue;
 337
 338                 fprintf(f, "%s-> %s:\n",
 339                         prefix, socket_exec_command_to_string(c));
 340
 341                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 342         }
 343
 344         free(p2);
 345 }
 346
 347 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 348         socklen_t l;
 349         char *r;
 350         union {
 351                 struct sockaddr sa;
 352                 struct sockaddr_un un;
 353                 struct sockaddr_in in;
 354                 struct sockaddr_in6 in6;
 355                 struct sockaddr_storage storage;
 356         } local, remote;
 357
 358         assert(fd >= 0);
 359         assert(instance);
 360
 361         l = sizeof(local);
 362         if (getsockname(fd, &local.sa, &l) < 0)
 363                 return -errno;
 364
 365         l = sizeof(remote);
 366         if (getpeername(fd, &remote.sa, &l) < 0)
 367                 return -errno;
 368
 369         switch (local.sa.sa_family) {
 370
 371         case AF_INET: {
 372                 uint32_t
 373                         a = ntohl(local.in.sin_addr.s_addr),
 374                         b = ntohl(remote.in.sin_addr.s_addr);
 375
 376                 if (asprintf(&r,
 377                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 378                              nr,
 379                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 380                              ntohs(local.in.sin_port),
 381                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 382                              ntohs(remote.in.sin_port)) < 0)
 383                         return -ENOMEM;
 384
 385                 break;
 386         }
 387
 388         case AF_INET6: {
 389                 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 390
 391                 if (asprintf(&r,
 392                              "%u-%s:%u-%s:%u",
 393                              nr,
 394                              inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 395                              ntohs(local.in6.sin6_port),
 396                              inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 397                              ntohs(remote.in6.sin6_port)) < 0)
 398                         return -ENOMEM;
 399
 400                 break;
 401         }
 402
 403         case AF_UNIX: {
 404                 struct ucred ucred;
 405
 406                 l = sizeof(ucred);
 407                 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 408                         return -errno;
 409
 410                 if (asprintf(&r,
 411                              "%u-%llu-%llu",
 412                              nr,
 413                              (unsigned long long) ucred.pid,
 414                              (unsigned long long) ucred.uid) < 0)
 415                         return -ENOMEM;
 416
 417                 break;
 418         }
 419
 420         default:
 421                 assert_not_reached("Unhandled socket type.");
 422         }
 423
 424         *instance = r;
 425         return 0;
 426 }
 427
 428 static void socket_close_fds(Socket *s) {
 429         SocketPort *p;
 430
 431         assert(s);
 432
 433         LIST_FOREACH(port, p, s->ports) {
 434                 if (p->fd < 0)
 435                         continue;
 436
 437                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 438                 close_nointr_nofail(p->fd);
 439
 440                 /* One little note: we should never delete any sockets
 441                  * in the file system here! After all some other
 442                  * process we spawned might still have a reference of
 443                  * this fd and wants to continue to use it. Therefore
 444                  * we delete sockets in the file system before we
 445                  * create a new one, not after we stopped using
 446                  * one! */
 447
 448                 p->fd = -1;
 449         }
 450 }
 451
 452 static int socket_open_fds(Socket *s) {
 453         SocketPort *p;
 454         int r;
 455
 456         assert(s);
 457
 458         LIST_FOREACH(port, p, s->ports) {
 459
 460                 if (p->fd >= 0)
 461                         continue;
 462
 463                 if (p->type == SOCKET_SOCKET) {
 464
 465                         if ((r = socket_address_listen(
 466                                              &p->address,
 467                                              s->backlog,
 468                                              s->bind_ipv6_only,
 469                                              s->bind_to_device,
 470                                              s->directory_mode,
 471                                              s->socket_mode,
 472                                              &p->fd)) < 0)
 473                                 goto rollback;
 474
 475                 } else {
 476                         struct stat st;
 477                         assert(p->type == SOCKET_FIFO);
 478
 479                         mkdir_parents(p->path, s->directory_mode);
 480
 481                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 482                                 r = -errno;
 483                                 goto rollback;
 484                         }
 485
 486                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 487                                 r = -errno;
 488                                 goto rollback;
 489                         }
 490
 491                         if (fstat(p->fd, &st) < 0) {
 492                                 r = -errno;
 493                                 goto rollback;
 494                         }
 495
 496                         /* FIXME verify user, access mode */
 497
 498                         if (!S_ISFIFO(st.st_mode)) {
 499                                 r = -EEXIST;
 500                                 goto rollback;
 501                         }
 502                 }
 503         }
 504
 505         return 0;
 506
 507 rollback:
 508         socket_close_fds(s);
 509         return r;
 510 }
 511
 512 static void socket_unwatch_fds(Socket *s) {
 513         SocketPort *p;
 514
 515         assert(s);
 516
 517         LIST_FOREACH(port, p, s->ports) {
 518                 if (p->fd < 0)
 519                         continue;
 520
 521                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 522         }
 523 }
 524
 525 static int socket_watch_fds(Socket *s) {
 526         SocketPort *p;
 527         int r;
 528
 529         assert(s);
 530
 531         LIST_FOREACH(port, p, s->ports) {
 532                 if (p->fd < 0)
 533                         continue;
 534
 535                 p->fd_watch.socket_accept =
 536                         s->accept &&
 537                         p->type == SOCKET_SOCKET &&
 538                         socket_address_can_accept(&p->address);
 539
 540                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 541                         goto fail;
 542         }
 543
 544         return 0;
 545
 546 fail:
 547         socket_unwatch_fds(s);
 548         return r;
 549 }
 550
 551 static void socket_set_state(Socket *s, SocketState state) {
 552         SocketState old_state;
 553         assert(s);
 554
 555         old_state = s->state;
 556         s->state = state;
 557
 558         if (state != SOCKET_START_PRE &&
 559             state != SOCKET_START_POST &&
 560             state != SOCKET_STOP_PRE &&
 561             state != SOCKET_STOP_PRE_SIGTERM &&
 562             state != SOCKET_STOP_PRE_SIGKILL &&
 563             state != SOCKET_STOP_POST &&
 564             state != SOCKET_FINAL_SIGTERM &&
 565             state != SOCKET_FINAL_SIGKILL) {
 566                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 567                 socket_unwatch_control_pid(s);
 568                 s->control_command = NULL;
 569                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 570         }
 571
 572         if (state != SOCKET_LISTENING)
 573                 socket_unwatch_fds(s);
 574
 575         if (state != SOCKET_START_POST &&
 576             state != SOCKET_LISTENING &&
 577             state != SOCKET_RUNNING &&
 578             state != SOCKET_STOP_PRE &&
 579             state != SOCKET_STOP_PRE_SIGTERM &&
 580             state != SOCKET_STOP_PRE_SIGKILL)
 581                 socket_close_fds(s);
 582
 583         if (state != old_state)
 584                 log_debug("%s changed %s -> %s",
 585                           s->meta.id,
 586                           socket_state_to_string(old_state),
 587                           socket_state_to_string(state));
 588
 589         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 590 }
 591
 592 static int socket_coldplug(Unit *u) {
 593         Socket *s = SOCKET(u);
 594         int r;
 595
 596         assert(s);
 597         assert(s->state == SOCKET_DEAD);
 598
 599         if (s->deserialized_state != s->state) {
 600
 601                 if (s->deserialized_state == SOCKET_START_PRE ||
 602                     s->deserialized_state == SOCKET_START_POST ||
 603                     s->deserialized_state == SOCKET_STOP_PRE ||
 604                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 605                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
 606                     s->deserialized_state == SOCKET_STOP_POST ||
 607                     s->deserialized_state == SOCKET_FINAL_SIGTERM ||
 608                     s->deserialized_state == SOCKET_FINAL_SIGKILL) {
 609
 610                         if (s->control_pid <= 0)
 611                                 return -EBADMSG;
 612
 613                         if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
 614                                 return r;
 615
 616                         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 617                                 return r;
 618                 }
 619
 620                 if (s->deserialized_state == SOCKET_START_POST ||
 621                     s->deserialized_state == SOCKET_LISTENING ||
 622                     s->deserialized_state == SOCKET_RUNNING ||
 623                     s->deserialized_state == SOCKET_STOP_PRE ||
 624                     s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
 625                     s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
 626                         if ((r = socket_open_fds(s)) < 0)
 627                                 return r;
 628
 629                 if (s->deserialized_state == SOCKET_LISTENING)
 630                         if ((r = socket_watch_fds(s)) < 0)
 631                                 return r;
 632
 633                 socket_set_state(s, s->deserialized_state);
 634         }
 635
 636         return 0;
 637 }
 638
 639 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 640         pid_t pid;
 641         int r;
 642         char **argv;
 643
 644         assert(s);
 645         assert(c);
 646         assert(_pid);
 647
 648         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 649                 goto fail;
 650
 651         if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
 652                 r = -ENOMEM;
 653                 goto fail;
 654         }
 655
 656         r = exec_spawn(c,
 657                        argv,
 658                        &s->exec_context,
 659                        NULL, 0,
 660                        s->meta.manager->environment,
 661                        true,
 662                        true,
 663                        UNIT(s)->meta.manager->confirm_spawn,
 664                        UNIT(s)->meta.cgroup_bondings,
 665                        &pid);
 666
 667         strv_free(argv);
 668         if (r < 0)
 669                 goto fail;
 670
 671         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 672                 /* FIXME: we need to do something here */
 673                 goto fail;
 674
 675         *_pid = pid;
 676
 677         return 0;
 678
 679 fail:
 680         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 681
 682         return r;
 683 }
 684
 685 static void socket_enter_dead(Socket *s, bool success) {
 686         assert(s);
 687
 688         if (!success)
 689                 s->failure = true;
 690
 691         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 692 }
 693
 694 static void socket_enter_signal(Socket *s, SocketState state, bool success);
 695
 696 static void socket_enter_stop_post(Socket *s, bool success) {
 697         int r;
 698         assert(s);
 699
 700         if (!success)
 701                 s->failure = true;
 702
 703         socket_unwatch_control_pid(s);
 704
 705         s->control_command_id = SOCKET_EXEC_STOP_POST;
 706
 707         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 708                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 709                         goto fail;
 710
 711                 socket_set_state(s, SOCKET_STOP_POST);
 712         } else
 713                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
 714
 715         return;
 716
 717 fail:
 718         log_warning("%s failed to run stop-post executable: %s", s->meta.id, strerror(-r));
 719         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 720 }
 721
 722 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 723         int r;
 724         bool sent = false;
 725
 726         assert(s);
 727
 728         if (!success)
 729                 s->failure = true;
 730
 731         if (s->kill_mode != KILL_NONE) {
 732                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
 733
 734                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 735
 736                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 737                                 if (r != -EAGAIN && r != -ESRCH)
 738                                         goto fail;
 739                         } else
 740                                 sent = true;
 741                 }
 742
 743                 if (!sent && s->control_pid > 0)
 744                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 745                                 r = -errno;
 746                                 goto fail;
 747                         }
 748         }
 749
 750         if (sent && s->control_pid > 0) {
 751                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 752                         goto fail;
 753
 754                 socket_set_state(s, state);
 755         } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 756                 socket_enter_stop_post(s, true);
 757         else
 758                 socket_enter_dead(s, true);
 759
 760         return;
 761
 762 fail:
 763         log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
 764
 765         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 766                 socket_enter_stop_post(s, false);
 767         else
 768                 socket_enter_dead(s, false);
 769 }
 770
 771 static void socket_enter_stop_pre(Socket *s, bool success) {
 772         int r;
 773         assert(s);
 774
 775         if (!success)
 776                 s->failure = true;
 777
 778         socket_unwatch_control_pid(s);
 779
 780         s->control_command_id = SOCKET_EXEC_STOP_PRE;
 781
 782         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
 783                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 784                         goto fail;
 785
 786                 socket_set_state(s, SOCKET_STOP_PRE);
 787         } else
 788                 socket_enter_stop_post(s, true);
 789
 790         return;
 791
 792 fail:
 793         log_warning("%s failed to run stop-pre executable: %s", s->meta.id, strerror(-r));
 794         socket_enter_stop_post(s, false);
 795 }
 796
 797 static void socket_enter_listening(Socket *s) {
 798         int r;
 799         assert(s);
 800
 801         if ((r = socket_watch_fds(s)) < 0) {
 802                 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
 803                 goto fail;
 804         }
 805
 806         socket_set_state(s, SOCKET_LISTENING);
 807         return;
 808
 809 fail:
 810         socket_enter_stop_pre(s, false);
 811 }
 812
 813 static void socket_enter_start_post(Socket *s) {
 814         int r;
 815         assert(s);
 816
 817         if ((r = socket_open_fds(s)) < 0) {
 818                 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
 819                 goto fail;
 820         }
 821
 822         socket_unwatch_control_pid(s);
 823
 824         s->control_command_id = SOCKET_EXEC_START_POST;
 825
 826         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
 827                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
 828                         log_warning("%s failed to run start-post executable: %s", s->meta.id, strerror(-r));
 829                         goto fail;
 830                 }
 831
 832                 socket_set_state(s, SOCKET_START_POST);
 833         } else
 834                 socket_enter_listening(s);
 835
 836         return;
 837
 838 fail:
 839         socket_enter_stop_pre(s, false);
 840 }
 841
 842 static void socket_enter_start_pre(Socket *s) {
 843         int r;
 844         assert(s);
 845
 846         socket_unwatch_control_pid(s);
 847
 848         s->control_command_id = SOCKET_EXEC_START_PRE;
 849
 850         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
 851                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 852                         goto fail;
 853
 854                 socket_set_state(s, SOCKET_START_PRE);
 855         } else
 856                 socket_enter_start_post(s);
 857
 858         return;
 859
 860 fail:
 861         log_warning("%s failed to run start-pre exectuable: %s", s->meta.id, strerror(-r));
 862         socket_enter_dead(s, false);
 863 }
 864
 865 static void socket_enter_running(Socket *s, int cfd) {
 866         int r;
 867
 868         assert(s);
 869
 870         if (cfd < 0) {
 871                 if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 872                         goto fail;
 873
 874                 socket_set_state(s, SOCKET_RUNNING);
 875         } else {
 876                 Unit *u;
 877                 char *prefix, *instance, *name;
 878
 879                 if ((r = instance_from_socket(cfd, s->n_accepted++, &instance)))
 880                         goto fail;
 881
 882                 if (!(prefix = unit_name_to_prefix(UNIT(s)->meta.id))) {
 883                         free(instance);
 884                         r = -ENOMEM;
 885                         goto fail;
 886                 }
 887
 888                 name = unit_name_build(prefix, instance, ".service");
 889                 free(prefix);
 890                 free(instance);
 891
 892                 if (!name)
 893                         r = -ENOMEM;
 894
 895                 r = manager_load_unit(UNIT(s)->meta.manager, name, NULL, &u);
 896                 free(name);
 897
 898                 if (r < 0)
 899                         goto fail;
 900
 901                 if ((r = service_set_socket_fd(SERVICE(u), cfd) < 0))
 902                         goto fail;
 903
 904                 cfd = -1;
 905
 906                 if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, NULL)) < 0)
 907                         goto fail;
 908         }
 909
 910         return;
 911
 912 fail:
 913         log_warning("%s failed to queue socket startup job: %s", s->meta.id, strerror(-r));
 914         socket_enter_stop_pre(s, false);
 915
 916         if (cfd >= 0)
 917                 close_nointr_nofail(cfd);
 918 }
 919
 920 static void socket_run_next(Socket *s, bool success) {
 921         int r;
 922
 923         assert(s);
 924         assert(s->control_command);
 925         assert(s->control_command->command_next);
 926
 927         if (!success)
 928                 s->failure = true;
 929
 930         socket_unwatch_control_pid(s);
 931
 932         s->control_command = s->control_command->command_next;
 933
 934         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 935                 goto fail;
 936
 937         return;
 938
 939 fail:
 940         log_warning("%s failed to run spawn next executable: %s", s->meta.id, strerror(-r));
 941
 942         if (s->state == SOCKET_START_POST)
 943                 socket_enter_stop_pre(s, false);
 944         else if (s->state == SOCKET_STOP_POST)
 945                 socket_enter_dead(s, false);
 946         else
 947                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 948 }
 949
 950 static int socket_start(Unit *u) {
 951         Socket *s = SOCKET(u);
 952
 953         assert(s);
 954
 955         /* We cannot fulfill this request right now, try again later
 956          * please! */
 957         if (s->state == SOCKET_STOP_PRE ||
 958             s->state == SOCKET_STOP_PRE_SIGKILL ||
 959             s->state == SOCKET_STOP_PRE_SIGTERM ||
 960             s->state == SOCKET_STOP_POST ||
 961             s->state == SOCKET_FINAL_SIGTERM ||
 962             s->state == SOCKET_FINAL_SIGKILL)
 963                 return -EAGAIN;
 964
 965         if (s->state == SOCKET_START_PRE ||
 966             s->state == SOCKET_START_POST)
 967                 return 0;
 968
 969         /* Cannot run this without the service being around */
 970         if (s->service) {
 971                 if (s->service->meta.load_state != UNIT_LOADED)
 972                         return -ENOENT;
 973
 974                 /* If the service is alredy actvie we cannot start the
 975                  * socket */
 976                 if (s->service->state != SERVICE_DEAD &&
 977                     s->service->state != SERVICE_MAINTAINANCE &&
 978                     s->service->state != SERVICE_AUTO_RESTART)
 979                         return -EBUSY;
 980         }
 981
 982         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 983
 984         s->failure = false;
 985         socket_enter_start_pre(s);
 986         return 0;
 987 }
 988
 989 static int socket_stop(Unit *u) {
 990         Socket *s = SOCKET(u);
 991
 992         assert(s);
 993
 994         /* We cannot fulfill this request right now, try again later
 995          * please! */
 996         if (s->state == SOCKET_START_PRE ||
 997             s->state == SOCKET_START_POST)
 998                 return -EAGAIN;
 999
1000         /* Already on it */
1001         if (s->state == SOCKET_STOP_PRE ||
1002             s->state == SOCKET_STOP_PRE_SIGTERM ||
1003             s->state == SOCKET_STOP_PRE_SIGKILL ||
1004             s->state == SOCKET_STOP_POST ||
1005             s->state == SOCKET_FINAL_SIGTERM ||
1006             s->state == SOCKET_FINAL_SIGTERM)
1007                 return 0;
1008
1009         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1010
1011         socket_enter_stop_pre(s, true);
1012         return 0;
1013 }
1014
1015 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1016         Socket *s = SOCKET(u);
1017         SocketPort *p;
1018         int r;
1019
1020         assert(u);
1021         assert(f);
1022         assert(fds);
1023
1024         unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1025         unit_serialize_item(u, f, "failure", yes_no(s->failure));
1026         unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1027
1028         if (s->control_pid > 0)
1029                 unit_serialize_item_format(u, f, "control-pid", "%u", (unsigned) s->control_pid);
1030
1031         if (s->control_command_id >= 0)
1032                 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1033
1034         LIST_FOREACH(port, p, s->ports) {
1035                 int copy;
1036
1037                 if (p->fd < 0)
1038                         continue;
1039
1040                 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1041                         return copy;
1042
1043                 if (p->type == SOCKET_SOCKET) {
1044                         char *t;
1045
1046                         if ((r = socket_address_print(&p->address, &t)) < 0)
1047                                 return r;
1048
1049                         unit_serialize_item_format(u, f, "socket", "%i %s", copy, t);
1050                         free(t);
1051                 } else {
1052                         assert(p->type == SOCKET_FIFO);
1053                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1054                 }
1055         }
1056
1057         return 0;
1058 }
1059
1060 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1061         Socket *s = SOCKET(u);
1062         int r;
1063
1064         assert(u);
1065         assert(key);
1066         assert(value);
1067         assert(fds);
1068
1069         if (streq(key, "state")) {
1070                 SocketState state;
1071
1072                 if ((state = socket_state_from_string(value)) < 0)
1073                         log_debug("Failed to parse state value %s", value);
1074                 else
1075                         s->deserialized_state = state;
1076         } else if (streq(key, "failure")) {
1077                 int b;
1078
1079                 if ((b = parse_boolean(value)) < 0)
1080                         log_debug("Failed to parse failure value %s", value);
1081                 else
1082                         s->failure = b || s->failure;
1083
1084         } else if (streq(key, "n-accepted")) {
1085                 unsigned k;
1086
1087                 if ((r = safe_atou(value, &k)) < 0)
1088                         log_debug("Failed to parse n-accepted value %s", value);
1089                 else
1090                         s->n_accepted += k;
1091         } else if (streq(key, "control-pid")) {
1092                 unsigned pid;
1093
1094                 if ((r = safe_atou(value, &pid)) < 0 || pid <= 0)
1095                         log_debug("Failed to parse control-pid value %s", value);
1096                 else
1097                         s->control_pid = (pid_t) pid;
1098         } else if (streq(key, "control-command")) {
1099                 SocketExecCommand id;
1100
1101                 if ((id = socket_exec_command_from_string(value)) < 0)
1102                         log_debug("Failed to parse exec-command value %s", value);
1103                 else {
1104                         s->control_command_id = id;
1105                         s->control_command = s->exec_command[id];
1106                 }
1107         } else if (streq(key, "fifo")) {
1108                 int fd, skip = 0;
1109                 SocketPort *p;
1110
1111                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1112                         log_debug("Failed to parse fifo value %s", value);
1113                 else {
1114
1115                         LIST_FOREACH(port, p, s->ports)
1116                                 if (streq(p->path, value+skip))
1117                                         break;
1118
1119                         if (p) {
1120                                 if (p->fd >= 0)
1121                                         close_nointr_nofail(p->fd);
1122                                 p->fd = fdset_remove(fds, fd);
1123                         }
1124                 }
1125
1126         } else if (streq(key, "socket")) {
1127                 int fd, skip = 0;
1128                 SocketPort *p;
1129
1130                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1131                         log_debug("Failed to parse socket value %s", value);
1132                 else {
1133
1134                         LIST_FOREACH(port, p, s->ports)
1135                                 if (socket_address_is(&p->address, value+skip))
1136                                         break;
1137
1138                         if (p) {
1139                                 if (p->fd >= 0)
1140                                         close_nointr_nofail(p->fd);
1141                                 p->fd = fdset_remove(fds, fd);
1142                         }
1143                 }
1144
1145         } else
1146                 log_debug("Unknown serialization key '%s'", key);
1147
1148         return 0;
1149 }
1150
1151 static UnitActiveState socket_active_state(Unit *u) {
1152         assert(u);
1153
1154         return state_translation_table[SOCKET(u)->state];
1155 }
1156
1157 static const char *socket_sub_state_to_string(Unit *u) {
1158         assert(u);
1159
1160         return socket_state_to_string(SOCKET(u)->state);
1161 }
1162
1163 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1164         Socket *s = SOCKET(u);
1165         int cfd = -1;
1166
1167         assert(s);
1168         assert(fd >= 0);
1169
1170         log_debug("Incoming traffic on %s", u->meta.id);
1171
1172         if (events != EPOLLIN) {
1173                 log_error("Got invalid poll event on socket.");
1174                 goto fail;
1175         }
1176
1177         if (w->socket_accept) {
1178                 for (;;) {
1179
1180                         if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1181
1182                                 if (errno == EINTR)
1183                                         continue;
1184
1185                                 log_error("Failed to accept socket: %m");
1186                                 goto fail;
1187                         }
1188
1189                         break;
1190                 }
1191         }
1192
1193         socket_enter_running(s, cfd);
1194         return;
1195
1196 fail:
1197         socket_enter_stop_pre(s, false);
1198 }
1199
1200 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1201         Socket *s = SOCKET(u);
1202         bool success;
1203
1204         assert(s);
1205         assert(pid >= 0);
1206
1207         success = is_clean_exit(code, status);
1208         s->failure = s->failure || !success;
1209
1210         assert(s->control_pid == pid);
1211         s->control_pid = 0;
1212
1213         if (s->control_command)
1214                 exec_status_fill(&s->control_command->exec_status, pid, code, status);
1215
1216         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1217
1218         if (s->control_command && s->control_command->command_next && success) {
1219                 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1220                 socket_run_next(s, success);
1221         } else {
1222                 s->control_command = NULL;
1223                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1224
1225                 /* No further commands for this step, so let's figure
1226                  * out what to do next */
1227
1228                 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1229
1230                 switch (s->state) {
1231
1232                 case SOCKET_START_PRE:
1233                         if (success)
1234                                 socket_enter_start_post(s);
1235                         else
1236                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1237                         break;
1238
1239                 case SOCKET_START_POST:
1240                         if (success)
1241                                 socket_enter_listening(s);
1242                         else
1243                                 socket_enter_stop_pre(s, false);
1244                         break;
1245
1246                 case SOCKET_STOP_PRE:
1247                 case SOCKET_STOP_PRE_SIGTERM:
1248                 case SOCKET_STOP_PRE_SIGKILL:
1249                         socket_enter_stop_post(s, success);
1250                         break;
1251
1252                 case SOCKET_STOP_POST:
1253                 case SOCKET_FINAL_SIGTERM:
1254                 case SOCKET_FINAL_SIGKILL:
1255                         socket_enter_dead(s, success);
1256                         break;
1257
1258                 default:
1259                         assert_not_reached("Uh, control process died at wrong time.");
1260                 }
1261         }
1262 }
1263
1264 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1265         Socket *s = SOCKET(u);
1266
1267         assert(s);
1268         assert(elapsed == 1);
1269         assert(w == &s->timer_watch);
1270
1271         switch (s->state) {
1272
1273         case SOCKET_START_PRE:
1274                 log_warning("%s starting timed out. Terminating.", u->meta.id);
1275                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1276
1277         case SOCKET_START_POST:
1278                 log_warning("%s starting timed out. Stopping.", u->meta.id);
1279                 socket_enter_stop_pre(s, false);
1280                 break;
1281
1282         case SOCKET_STOP_PRE:
1283                 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1284                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1285                 break;
1286
1287         case SOCKET_STOP_PRE_SIGTERM:
1288                 log_warning("%s stopping timed out. Killing.", u->meta.id);
1289                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1290                 break;
1291
1292         case SOCKET_STOP_PRE_SIGKILL:
1293                 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1294                 socket_enter_stop_post(s, false);
1295                 break;
1296
1297         case SOCKET_STOP_POST:
1298                 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1299                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1300                 break;
1301
1302         case SOCKET_FINAL_SIGTERM:
1303                 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1304                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1305                 break;
1306
1307         case SOCKET_FINAL_SIGKILL:
1308                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", u->meta.id);
1309                 socket_enter_dead(s, false);
1310                 break;
1311
1312         default:
1313                 assert_not_reached("Timeout at wrong time.");
1314         }
1315 }
1316
1317 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1318         int *rfds;
1319         unsigned rn_fds, k;
1320         SocketPort *p;
1321
1322         assert(s);
1323         assert(fds);
1324         assert(n_fds);
1325
1326         /* Called from the service code for requesting our fds */
1327
1328         rn_fds = 0;
1329         LIST_FOREACH(port, p, s->ports)
1330                 if (p->fd >= 0)
1331                         rn_fds++;
1332
1333         if (!(rfds = new(int, rn_fds)) < 0)
1334                 return -ENOMEM;
1335
1336         k = 0;
1337         LIST_FOREACH(port, p, s->ports)
1338                 if (p->fd >= 0)
1339                         rfds[k++] = p->fd;
1340
1341         assert(k == rn_fds);
1342
1343         *fds = rfds;
1344         *n_fds = rn_fds;
1345
1346         return 0;
1347 }
1348
1349 void socket_notify_service_dead(Socket *s) {
1350         assert(s);
1351
1352         /* The service is dead. Dang. */
1353
1354         if (s->state == SOCKET_RUNNING) {
1355                 log_debug("%s got notified about service death.", s->meta.id);
1356                 socket_enter_listening(s);
1357         }
1358 }
1359
1360 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1361         [SOCKET_DEAD] = "dead",
1362         [SOCKET_START_PRE] = "start-pre",
1363         [SOCKET_START_POST] = "start-post",
1364         [SOCKET_LISTENING] = "listening",
1365         [SOCKET_RUNNING] = "running",
1366         [SOCKET_STOP_PRE] = "stop-pre",
1367         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1368         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1369         [SOCKET_STOP_POST] = "stop-post",
1370         [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1371         [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1372         [SOCKET_MAINTAINANCE] = "maintainance"
1373 };
1374
1375 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1376
1377 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1378         [SOCKET_EXEC_START_PRE] = "StartPre",
1379         [SOCKET_EXEC_START_POST] = "StartPost",
1380         [SOCKET_EXEC_STOP_PRE] = "StopPre",
1381         [SOCKET_EXEC_STOP_POST] = "StopPost"
1382 };
1383
1384 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1385
1386 const UnitVTable socket_vtable = {
1387         .suffix = ".socket",
1388
1389         .init = socket_init,
1390         .done = socket_done,
1391         .load = socket_load,
1392
1393         .coldplug = socket_coldplug,
1394
1395         .dump = socket_dump,
1396
1397         .start = socket_start,
1398         .stop = socket_stop,
1399
1400         .serialize = socket_serialize,
1401         .deserialize_item = socket_deserialize_item,
1402
1403         .active_state = socket_active_state,
1404         .sub_state_to_string = socket_sub_state_to_string,
1405
1406         .fd_event = socket_fd_event,
1407         .sigchld_event = socket_sigchld_event,
1408         .timer_event = socket_timer_event,
1409
1410         .bus_message_handler = bus_socket_message_handler
1411 };