src/core/socket.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <arpa/inet.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <mqueue.h>
   7 #include <netinet/tcp.h>
   8 #include <sys/epoll.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #include <linux/sctp.h>
  12
  13 #include "alloc-util.h"
  14 #include "bpf-firewall.h"
  15 #include "bus-error.h"
  16 #include "bus-util.h"
  17 #include "copy.h"
  18 #include "dbus-socket.h"
  19 #include "dbus-unit.h"
  20 #include "def.h"
  21 #include "errno-list.h"
  22 #include "exit-status.h"
  23 #include "fd-util.h"
  24 #include "format-util.h"
  25 #include "fs-util.h"
  26 #include "in-addr-util.h"
  27 #include "io-util.h"
  28 #include "ip-protocol-list.h"
  29 #include "label.h"
  30 #include "log.h"
  31 #include "mkdir.h"
  32 #include "parse-util.h"
  33 #include "path-util.h"
  34 #include "process-util.h"
  35 #include "selinux-util.h"
  36 #include "serialize.h"
  37 #include "signal-util.h"
  38 #include "smack-util.h"
  39 #include "socket.h"
  40 #include "socket-netlink.h"
  41 #include "special.h"
  42 #include "string-table.h"
  43 #include "string-util.h"
  44 #include "strv.h"
  45 #include "unit-name.h"
  46 #include "unit.h"
  47 #include "user-util.h"
  48
  49 struct SocketPeer {
  50         unsigned n_ref;
  51
  52         Socket *socket;
  53         union sockaddr_union peer;
  54         socklen_t peer_salen;
  55 };
  56
  57 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  58         [SOCKET_DEAD] = UNIT_INACTIVE,
  59         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  60         [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
  61         [SOCKET_START_POST] = UNIT_ACTIVATING,
  62         [SOCKET_LISTENING] = UNIT_ACTIVE,
  63         [SOCKET_RUNNING] = UNIT_ACTIVE,
  64         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  65         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  66         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  67         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  68         [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  69         [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  70         [SOCKET_FAILED] = UNIT_FAILED,
  71         [SOCKET_CLEANING] = UNIT_MAINTENANCE,
  72 };
  73
  74 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
  75 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
  76 static void flush_ports(Socket *s);
  77
  78 static void socket_init(Unit *u) {
  79         Socket *s = SOCKET(u);
  80
  81         assert(u);
  82         assert(u->load_state == UNIT_STUB);
  83
  84         s->backlog = SOMAXCONN;
  85         s->timeout_usec = u->manager->default_timeout_start_usec;
  86         s->directory_mode = 0755;
  87         s->socket_mode = 0666;
  88
  89         s->max_connections = 64;
  90
  91         s->priority = -1;
  92         s->ip_tos = -1;
  93         s->ip_ttl = -1;
  94         s->mark = -1;
  95
  96         s->exec_context.std_output = u->manager->default_std_output;
  97         s->exec_context.std_error = u->manager->default_std_error;
  98
  99         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 100
 101         s->trigger_limit.interval = USEC_INFINITY;
 102         s->trigger_limit.burst = (unsigned) -1;
 103 }
 104
 105 static void socket_unwatch_control_pid(Socket *s) {
 106         assert(s);
 107
 108         if (s->control_pid <= 0)
 109                 return;
 110
 111         unit_unwatch_pid(UNIT(s), s->control_pid);
 112         s->control_pid = 0;
 113 }
 114
 115 static void socket_cleanup_fd_list(SocketPort *p) {
 116         assert(p);
 117
 118         close_many(p->auxiliary_fds, p->n_auxiliary_fds);
 119         p->auxiliary_fds = mfree(p->auxiliary_fds);
 120         p->n_auxiliary_fds = 0;
 121 }
 122
 123 void socket_free_ports(Socket *s) {
 124         SocketPort *p;
 125
 126         assert(s);
 127
 128         while ((p = s->ports)) {
 129                 LIST_REMOVE(port, s->ports, p);
 130
 131                 sd_event_source_unref(p->event_source);
 132
 133                 socket_cleanup_fd_list(p);
 134                 safe_close(p->fd);
 135                 free(p->path);
 136                 free(p);
 137         }
 138 }
 139
 140 static void socket_done(Unit *u) {
 141         Socket *s = SOCKET(u);
 142         SocketPeer *p;
 143
 144         assert(s);
 145
 146         socket_free_ports(s);
 147
 148         while ((p = set_steal_first(s->peers_by_address)))
 149                 p->socket = NULL;
 150
 151         s->peers_by_address = set_free(s->peers_by_address);
 152
 153         s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
 154         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
 155         s->control_command = NULL;
 156
 157         dynamic_creds_unref(&s->dynamic_creds);
 158
 159         socket_unwatch_control_pid(s);
 160
 161         unit_ref_unset(&s->service);
 162
 163         s->tcp_congestion = mfree(s->tcp_congestion);
 164         s->bind_to_device = mfree(s->bind_to_device);
 165
 166         s->smack = mfree(s->smack);
 167         s->smack_ip_in = mfree(s->smack_ip_in);
 168         s->smack_ip_out = mfree(s->smack_ip_out);
 169
 170         strv_free(s->symlinks);
 171
 172         s->user = mfree(s->user);
 173         s->group = mfree(s->group);
 174
 175         s->fdname = mfree(s->fdname);
 176
 177         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 178 }
 179
 180 static int socket_arm_timer(Socket *s, usec_t usec) {
 181         int r;
 182
 183         assert(s);
 184
 185         if (s->timer_event_source) {
 186                 r = sd_event_source_set_time(s->timer_event_source, usec);
 187                 if (r < 0)
 188                         return r;
 189
 190                 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
 191         }
 192
 193         if (usec == USEC_INFINITY)
 194                 return 0;
 195
 196         r = sd_event_add_time(
 197                         UNIT(s)->manager->event,
 198                         &s->timer_event_source,
 199                         CLOCK_MONOTONIC,
 200                         usec, 0,
 201                         socket_dispatch_timer, s);
 202         if (r < 0)
 203                 return r;
 204
 205         (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
 206
 207         return 0;
 208 }
 209
 210 static bool have_non_accept_socket(Socket *s) {
 211         SocketPort *p;
 212
 213         assert(s);
 214
 215         if (!s->accept)
 216                 return true;
 217
 218         LIST_FOREACH(port, p, s->ports) {
 219
 220                 if (p->type != SOCKET_SOCKET)
 221                         return true;
 222
 223                 if (!socket_address_can_accept(&p->address))
 224                         return true;
 225         }
 226
 227         return false;
 228 }
 229
 230 static int socket_add_mount_dependencies(Socket *s) {
 231         SocketPort *p;
 232         int r;
 233
 234         assert(s);
 235
 236         LIST_FOREACH(port, p, s->ports) {
 237                 const char *path = NULL;
 238
 239                 if (p->type == SOCKET_SOCKET)
 240                         path = socket_address_get_path(&p->address);
 241                 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
 242                         path = p->path;
 243
 244                 if (!path)
 245                         continue;
 246
 247                 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
 248                 if (r < 0)
 249                         return r;
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int socket_add_device_dependencies(Socket *s) {
 256         char *t;
 257
 258         assert(s);
 259
 260         if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
 261                 return 0;
 262
 263         t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
 264         return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
 265 }
 266
 267 static int socket_add_default_dependencies(Socket *s) {
 268         int r;
 269         assert(s);
 270
 271         if (!UNIT(s)->default_dependencies)
 272                 return 0;
 273
 274         r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
 275         if (r < 0)
 276                 return r;
 277
 278         if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
 279                 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
 280                 if (r < 0)
 281                         return r;
 282         }
 283
 284         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
 285 }
 286
 287 _pure_ static bool socket_has_exec(Socket *s) {
 288         unsigned i;
 289         assert(s);
 290
 291         for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
 292                 if (s->exec_command[i])
 293                         return true;
 294
 295         return false;
 296 }
 297
 298 static int socket_add_extras(Socket *s) {
 299         Unit *u = UNIT(s);
 300         int r;
 301
 302         assert(s);
 303
 304         /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
 305          * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
 306          * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
 307          * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
 308          * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
 309          * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
 310          * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
 311          * service starts are typical. */
 312
 313         if (s->trigger_limit.interval == USEC_INFINITY)
 314                 s->trigger_limit.interval = 2 * USEC_PER_SEC;
 315
 316         if (s->trigger_limit.burst == (unsigned) -1) {
 317                 if (s->accept)
 318                         s->trigger_limit.burst = 200;
 319                 else
 320                         s->trigger_limit.burst = 20;
 321         }
 322
 323         if (have_non_accept_socket(s)) {
 324
 325                 if (!UNIT_DEREF(s->service)) {
 326                         Unit *x;
 327
 328                         r = unit_load_related_unit(u, ".service", &x);
 329                         if (r < 0)
 330                                 return r;
 331
 332                         unit_ref_set(&s->service, u, x);
 333                 }
 334
 335                 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
 336                 if (r < 0)
 337                         return r;
 338         }
 339
 340         r = socket_add_mount_dependencies(s);
 341         if (r < 0)
 342                 return r;
 343
 344         r = socket_add_device_dependencies(s);
 345         if (r < 0)
 346                 return r;
 347
 348         r = unit_patch_contexts(u);
 349         if (r < 0)
 350                 return r;
 351
 352         if (socket_has_exec(s)) {
 353                 r = unit_add_exec_dependencies(u, &s->exec_context);
 354                 if (r < 0)
 355                         return r;
 356         }
 357
 358         r = unit_set_default_slice(u);
 359         if (r < 0)
 360                 return r;
 361
 362         r = socket_add_default_dependencies(s);
 363         if (r < 0)
 364                 return r;
 365
 366         return 0;
 367 }
 368
 369 static const char *socket_find_symlink_target(Socket *s) {
 370         const char *found = NULL;
 371         SocketPort *p;
 372
 373         LIST_FOREACH(port, p, s->ports) {
 374                 const char *f = NULL;
 375
 376                 switch (p->type) {
 377
 378                 case SOCKET_FIFO:
 379                         f = p->path;
 380                         break;
 381
 382                 case SOCKET_SOCKET:
 383                         f = socket_address_get_path(&p->address);
 384                         break;
 385
 386                 default:
 387                         break;
 388                 }
 389
 390                 if (f) {
 391                         if (found)
 392                                 return NULL;
 393
 394                         found = f;
 395                 }
 396         }
 397
 398         return found;
 399 }
 400
 401 static int socket_verify(Socket *s) {
 402         assert(s);
 403         assert(UNIT(s)->load_state == UNIT_LOADED);
 404
 405         if (!s->ports) {
 406                 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
 407                 return -ENOEXEC;
 408         }
 409
 410         if (s->accept && have_non_accept_socket(s)) {
 411                 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
 412                 return -ENOEXEC;
 413         }
 414
 415         if (s->accept && s->max_connections <= 0) {
 416                 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
 417                 return -ENOEXEC;
 418         }
 419
 420         if (s->accept && UNIT_DEREF(s->service)) {
 421                 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
 422                 return -ENOEXEC;
 423         }
 424
 425         if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
 426                 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
 427                 return -ENOEXEC;
 428         }
 429
 430         if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
 431                 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
 432                 return -ENOEXEC;
 433         }
 434
 435         return 0;
 436 }
 437
 438 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
 439         assert(s);
 440
 441         if (s->peer.sa.sa_family == AF_INET)
 442                 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
 443         else if (s->peer.sa.sa_family == AF_INET6)
 444                 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
 445         else if (s->peer.sa.sa_family == AF_VSOCK)
 446                 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
 447         else
 448                 assert_not_reached("Unknown address family.");
 449 }
 450
 451 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
 452         int r;
 453
 454         r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
 455         if (r != 0)
 456                 return r;
 457
 458         switch(x->peer.sa.sa_family) {
 459         case AF_INET:
 460                 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
 461         case AF_INET6:
 462                 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
 463         case AF_VSOCK:
 464                 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
 465         }
 466         assert_not_reached("Black sheep in the family!");
 467 }
 468
 469 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
 470
 471 static int socket_load(Unit *u) {
 472         Socket *s = SOCKET(u);
 473         int r;
 474
 475         assert(u);
 476         assert(u->load_state == UNIT_STUB);
 477
 478         r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
 479         if (r < 0)
 480                 return r;
 481
 482         r = unit_load_fragment_and_dropin(u, true);
 483         if (r < 0)
 484                 return r;
 485
 486         if (u->load_state != UNIT_LOADED)
 487                 return 0;
 488
 489         /* This is a new unit? Then let's add in some extras */
 490         r = socket_add_extras(s);
 491         if (r < 0)
 492                 return r;
 493
 494         return socket_verify(s);
 495 }
 496
 497 static SocketPeer *socket_peer_new(void) {
 498         SocketPeer *p;
 499
 500         p = new0(SocketPeer, 1);
 501         if (!p)
 502                 return NULL;
 503
 504         p->n_ref = 1;
 505
 506         return p;
 507 }
 508
 509 static SocketPeer *socket_peer_free(SocketPeer *p) {
 510         assert(p);
 511
 512         if (p->socket)
 513                 set_remove(p->socket->peers_by_address, p);
 514
 515         return mfree(p);
 516 }
 517
 518 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
 519
 520 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
 521         _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
 522         SocketPeer sa = {}, *i;
 523         socklen_t salen = sizeof(sa.peer);
 524         int r;
 525
 526         assert(fd >= 0);
 527         assert(s);
 528
 529         r = getpeername(fd, &sa.peer.sa, &salen);
 530         if (r < 0)
 531                 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
 532
 533         if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
 534                 *p = NULL;
 535                 return 0;
 536         }
 537
 538         i = set_get(s->peers_by_address, &sa);
 539         if (i) {
 540                 *p = socket_peer_ref(i);
 541                 return 1;
 542         }
 543
 544         remote = socket_peer_new();
 545         if (!remote)
 546                 return log_oom();
 547
 548         remote->peer = sa.peer;
 549         remote->peer_salen = salen;
 550
 551         r = set_put(s->peers_by_address, remote);
 552         if (r < 0)
 553                 return r;
 554
 555         remote->socket = s;
 556
 557         *p = TAKE_PTR(remote);
 558
 559         return 1;
 560 }
 561
 562 _const_ static const char* listen_lookup(int family, int type) {
 563
 564         if (family == AF_NETLINK)
 565                 return "ListenNetlink";
 566
 567         if (type == SOCK_STREAM)
 568                 return "ListenStream";
 569         else if (type == SOCK_DGRAM)
 570                 return "ListenDatagram";
 571         else if (type == SOCK_SEQPACKET)
 572                 return "ListenSequentialPacket";
 573
 574         assert_not_reached("Unknown socket type");
 575         return NULL;
 576 }
 577
 578 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 579         char time_string[FORMAT_TIMESPAN_MAX];
 580         SocketExecCommand c;
 581         Socket *s = SOCKET(u);
 582         SocketPort *p;
 583         const char *prefix2, *str;
 584
 585         assert(s);
 586         assert(f);
 587
 588         prefix = strempty(prefix);
 589         prefix2 = strjoina(prefix, "\t");
 590
 591         fprintf(f,
 592                 "%sSocket State: %s\n"
 593                 "%sResult: %s\n"
 594                 "%sClean Result: %s\n"
 595                 "%sBindIPv6Only: %s\n"
 596                 "%sBacklog: %u\n"
 597                 "%sSocketMode: %04o\n"
 598                 "%sDirectoryMode: %04o\n"
 599                 "%sKeepAlive: %s\n"
 600                 "%sNoDelay: %s\n"
 601                 "%sFreeBind: %s\n"
 602                 "%sTransparent: %s\n"
 603                 "%sBroadcast: %s\n"
 604                 "%sPassCredentials: %s\n"
 605                 "%sPassSecurity: %s\n"
 606                 "%sPassPacketInfo: %s\n"
 607                 "%sTCPCongestion: %s\n"
 608                 "%sRemoveOnStop: %s\n"
 609                 "%sWritable: %s\n"
 610                 "%sFileDescriptorName: %s\n"
 611                 "%sSELinuxContextFromNet: %s\n",
 612                 prefix, socket_state_to_string(s->state),
 613                 prefix, socket_result_to_string(s->result),
 614                 prefix, socket_result_to_string(s->clean_result),
 615                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
 616                 prefix, s->backlog,
 617                 prefix, s->socket_mode,
 618                 prefix, s->directory_mode,
 619                 prefix, yes_no(s->keep_alive),
 620                 prefix, yes_no(s->no_delay),
 621                 prefix, yes_no(s->free_bind),
 622                 prefix, yes_no(s->transparent),
 623                 prefix, yes_no(s->broadcast),
 624                 prefix, yes_no(s->pass_cred),
 625                 prefix, yes_no(s->pass_sec),
 626                 prefix, yes_no(s->pass_pktinfo),
 627                 prefix, strna(s->tcp_congestion),
 628                 prefix, yes_no(s->remove_on_stop),
 629                 prefix, yes_no(s->writable),
 630                 prefix, socket_fdname(s),
 631                 prefix, yes_no(s->selinux_context_from_net));
 632
 633         if (s->control_pid > 0)
 634                 fprintf(f,
 635                         "%sControl PID: "PID_FMT"\n",
 636                         prefix, s->control_pid);
 637
 638         if (s->bind_to_device)
 639                 fprintf(f,
 640                         "%sBindToDevice: %s\n",
 641                         prefix, s->bind_to_device);
 642
 643         if (s->accept)
 644                 fprintf(f,
 645                         "%sAccepted: %u\n"
 646                         "%sNConnections: %u\n"
 647                         "%sMaxConnections: %u\n"
 648                         "%sMaxConnectionsPerSource: %u\n",
 649                         prefix, s->n_accepted,
 650                         prefix, s->n_connections,
 651                         prefix, s->max_connections,
 652                         prefix, s->max_connections_per_source);
 653         else
 654                 fprintf(f,
 655                         "%sFlushPending: %s\n",
 656                          prefix, yes_no(s->flush_pending));
 657
 658
 659         if (s->priority >= 0)
 660                 fprintf(f,
 661                         "%sPriority: %i\n",
 662                         prefix, s->priority);
 663
 664         if (s->receive_buffer > 0)
 665                 fprintf(f,
 666                         "%sReceiveBuffer: %zu\n",
 667                         prefix, s->receive_buffer);
 668
 669         if (s->send_buffer > 0)
 670                 fprintf(f,
 671                         "%sSendBuffer: %zu\n",
 672                         prefix, s->send_buffer);
 673
 674         if (s->ip_tos >= 0)
 675                 fprintf(f,
 676                         "%sIPTOS: %i\n",
 677                         prefix, s->ip_tos);
 678
 679         if (s->ip_ttl >= 0)
 680                 fprintf(f,
 681                         "%sIPTTL: %i\n",
 682                         prefix, s->ip_ttl);
 683
 684         if (s->pipe_size > 0)
 685                 fprintf(f,
 686                         "%sPipeSize: %zu\n",
 687                         prefix, s->pipe_size);
 688
 689         if (s->mark >= 0)
 690                 fprintf(f,
 691                         "%sMark: %i\n",
 692                         prefix, s->mark);
 693
 694         if (s->mq_maxmsg > 0)
 695                 fprintf(f,
 696                         "%sMessageQueueMaxMessages: %li\n",
 697                         prefix, s->mq_maxmsg);
 698
 699         if (s->mq_msgsize > 0)
 700                 fprintf(f,
 701                         "%sMessageQueueMessageSize: %li\n",
 702                         prefix, s->mq_msgsize);
 703
 704         if (s->reuse_port)
 705                 fprintf(f,
 706                         "%sReusePort: %s\n",
 707                          prefix, yes_no(s->reuse_port));
 708
 709         if (s->smack)
 710                 fprintf(f,
 711                         "%sSmackLabel: %s\n",
 712                         prefix, s->smack);
 713
 714         if (s->smack_ip_in)
 715                 fprintf(f,
 716                         "%sSmackLabelIPIn: %s\n",
 717                         prefix, s->smack_ip_in);
 718
 719         if (s->smack_ip_out)
 720                 fprintf(f,
 721                         "%sSmackLabelIPOut: %s\n",
 722                         prefix, s->smack_ip_out);
 723
 724         if (!isempty(s->user) || !isempty(s->group))
 725                 fprintf(f,
 726                         "%sSocketUser: %s\n"
 727                         "%sSocketGroup: %s\n",
 728                         prefix, strna(s->user),
 729                         prefix, strna(s->group));
 730
 731         if (s->keep_alive_time > 0)
 732                 fprintf(f,
 733                         "%sKeepAliveTimeSec: %s\n",
 734                         prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
 735
 736         if (s->keep_alive_interval > 0)
 737                 fprintf(f,
 738                         "%sKeepAliveIntervalSec: %s\n",
 739                         prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
 740
 741         if (s->keep_alive_cnt > 0)
 742                 fprintf(f,
 743                         "%sKeepAliveProbes: %u\n",
 744                         prefix, s->keep_alive_cnt);
 745
 746         if (s->defer_accept > 0)
 747                 fprintf(f,
 748                         "%sDeferAcceptSec: %s\n",
 749                         prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
 750
 751         LIST_FOREACH(port, p, s->ports) {
 752
 753                 switch (p->type) {
 754                 case SOCKET_SOCKET: {
 755                         _cleanup_free_ char *k = NULL;
 756                         const char *t;
 757                         int r;
 758
 759                         r = socket_address_print(&p->address, &k);
 760                         if (r < 0)
 761                                 t = strerror_safe(r);
 762                         else
 763                                 t = k;
 764
 765                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
 766                         break;
 767                 }
 768                 case SOCKET_SPECIAL:
 769                         fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
 770                         break;
 771                 case SOCKET_USB_FUNCTION:
 772                         fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
 773                         break;
 774                 case SOCKET_MQUEUE:
 775                         fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
 776                         break;
 777                 default:
 778                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 779                 }
 780         }
 781
 782         fprintf(f,
 783                 "%sTriggerLimitIntervalSec: %s\n"
 784                 "%sTriggerLimitBurst: %u\n",
 785                 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
 786                 prefix, s->trigger_limit.burst);
 787
 788         str = ip_protocol_to_name(s->socket_protocol);
 789         if (str)
 790                 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
 791
 792         if (!strv_isempty(s->symlinks)) {
 793                 char **q;
 794
 795                 fprintf(f, "%sSymlinks:", prefix);
 796                 STRV_FOREACH(q, s->symlinks)
 797                         fprintf(f, " %s", *q);
 798
 799                 fprintf(f, "\n");
 800         }
 801
 802         fprintf(f,
 803                 "%sTimeoutSec: %s\n",
 804                 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
 805
 806         exec_context_dump(&s->exec_context, f, prefix);
 807         kill_context_dump(&s->kill_context, f, prefix);
 808
 809         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 810                 if (!s->exec_command[c])
 811                         continue;
 812
 813                 fprintf(f, "%s-> %s:\n",
 814                         prefix, socket_exec_command_to_string(c));
 815
 816                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 817         }
 818
 819         cgroup_context_dump(UNIT(s), f, prefix);
 820 }
 821
 822 static int instance_from_socket(int fd, unsigned nr, char **instance) {
 823         socklen_t l;
 824         char *r;
 825         union sockaddr_union local, remote;
 826
 827         assert(fd >= 0);
 828         assert(instance);
 829
 830         l = sizeof(local);
 831         if (getsockname(fd, &local.sa, &l) < 0)
 832                 return -errno;
 833
 834         l = sizeof(remote);
 835         if (getpeername(fd, &remote.sa, &l) < 0)
 836                 return -errno;
 837
 838         switch (local.sa.sa_family) {
 839
 840         case AF_INET: {
 841                 uint32_t
 842                         a = be32toh(local.in.sin_addr.s_addr),
 843                         b = be32toh(remote.in.sin_addr.s_addr);
 844
 845                 if (asprintf(&r,
 846                              "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 847                              nr,
 848                              a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
 849                              be16toh(local.in.sin_port),
 850                              b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
 851                              be16toh(remote.in.sin_port)) < 0)
 852                         return -ENOMEM;
 853
 854                 break;
 855         }
 856
 857         case AF_INET6: {
 858                 static const unsigned char ipv4_prefix[] = {
 859                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
 860                 };
 861
 862                 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
 863                     memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
 864                         const uint8_t
 865                                 *a = local.in6.sin6_addr.s6_addr+12,
 866                                 *b = remote.in6.sin6_addr.s6_addr+12;
 867
 868                         if (asprintf(&r,
 869                                      "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
 870                                      nr,
 871                                      a[0], a[1], a[2], a[3],
 872                                      be16toh(local.in6.sin6_port),
 873                                      b[0], b[1], b[2], b[3],
 874                                      be16toh(remote.in6.sin6_port)) < 0)
 875                                 return -ENOMEM;
 876                 } else {
 877                         char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
 878
 879                         if (asprintf(&r,
 880                                      "%u-%s:%u-%s:%u",
 881                                      nr,
 882                                      inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
 883                                      be16toh(local.in6.sin6_port),
 884                                      inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
 885                                      be16toh(remote.in6.sin6_port)) < 0)
 886                                 return -ENOMEM;
 887                 }
 888
 889                 break;
 890         }
 891
 892         case AF_UNIX: {
 893                 struct ucred ucred;
 894                 int k;
 895
 896                 k = getpeercred(fd, &ucred);
 897                 if (k >= 0) {
 898                         if (asprintf(&r,
 899                                      "%u-"PID_FMT"-"UID_FMT,
 900                                      nr, ucred.pid, ucred.uid) < 0)
 901                                 return -ENOMEM;
 902                 } else if (k == -ENODATA) {
 903                         /* This handles the case where somebody is
 904                          * connecting from another pid/uid namespace
 905                          * (e.g. from outside of our container). */
 906                         if (asprintf(&r,
 907                                      "%u-unknown",
 908                                      nr) < 0)
 909                                 return -ENOMEM;
 910                 } else
 911                         return k;
 912
 913                 break;
 914         }
 915
 916         case AF_VSOCK:
 917                 if (asprintf(&r,
 918                              "%u-%u:%u-%u:%u",
 919                              nr,
 920                              local.vm.svm_cid, local.vm.svm_port,
 921                              remote.vm.svm_cid, remote.vm.svm_port) < 0)
 922                         return -ENOMEM;
 923
 924                 break;
 925
 926         default:
 927                 assert_not_reached("Unhandled socket type.");
 928         }
 929
 930         *instance = r;
 931         return 0;
 932 }
 933
 934 static void socket_close_fds(Socket *s) {
 935         SocketPort *p;
 936         char **i;
 937
 938         assert(s);
 939
 940         LIST_FOREACH(port, p, s->ports) {
 941                 bool was_open;
 942
 943                 was_open = p->fd >= 0;
 944
 945                 p->event_source = sd_event_source_unref(p->event_source);
 946                 p->fd = safe_close(p->fd);
 947                 socket_cleanup_fd_list(p);
 948
 949                 /* One little note: we should normally not delete any sockets in the file system here! After all some
 950                  * other process we spawned might still have a reference of this fd and wants to continue to use
 951                  * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
 952                  * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
 953                  * anyway, but only then. */
 954
 955                 if (!was_open || !s->remove_on_stop)
 956                         continue;
 957
 958                 switch (p->type) {
 959
 960                 case SOCKET_FIFO:
 961                         (void) unlink(p->path);
 962                         break;
 963
 964                 case SOCKET_MQUEUE:
 965                         (void) mq_unlink(p->path);
 966                         break;
 967
 968                 case SOCKET_SOCKET:
 969                         (void) socket_address_unlink(&p->address);
 970                         break;
 971
 972                 default:
 973                         break;
 974                 }
 975         }
 976
 977         if (s->remove_on_stop)
 978                 STRV_FOREACH(i, s->symlinks)
 979                         (void) unlink(*i);
 980 }
 981
 982 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
 983         int r;
 984
 985         assert(s);
 986         assert(p);
 987         assert(fd >= 0);
 988
 989         if (s->keep_alive) {
 990                 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
 991                 if (r < 0)
 992                         log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
 993         }
 994
 995         if (s->keep_alive_time > 0) {
 996                 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
 997                 if (r < 0)
 998                         log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
 999         }
1000
1001         if (s->keep_alive_interval > 0) {
1002                 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
1003                 if (r < 0)
1004                         log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
1005         }
1006
1007         if (s->keep_alive_cnt > 0) {
1008                 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1009                 if (r < 0)
1010                         log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1011         }
1012
1013         if (s->defer_accept > 0) {
1014                 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1015                 if (r < 0)
1016                         log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1017         }
1018
1019         if (s->no_delay) {
1020                 if (s->socket_protocol == IPPROTO_SCTP) {
1021                         r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1022                         if (r < 0)
1023                                 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1024                 } else {
1025                         r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1026                         if (r < 0)
1027                                 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1028                 }
1029         }
1030
1031         if (s->broadcast) {
1032                 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1033                 if (r < 0)
1034                         log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1035         }
1036
1037         if (s->pass_cred) {
1038                 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1039                 if (r < 0)
1040                         log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1041         }
1042
1043         if (s->pass_sec) {
1044                 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1045                 if (r < 0)
1046                         log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1047         }
1048
1049         if (s->pass_pktinfo) {
1050                 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1051                 if (r < 0)
1052                         log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1053         }
1054
1055         if (s->priority >= 0) {
1056                 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1057                 if (r < 0)
1058                         log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1059         }
1060
1061         if (s->receive_buffer > 0) {
1062                 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1063                 if (r < 0)
1064                         log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1065                                             "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1066         }
1067
1068         if (s->send_buffer > 0) {
1069                 r = fd_set_sndbuf(fd, s->send_buffer, false);
1070                 if (r < 0)
1071                         log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1072                                             "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1073         }
1074
1075         if (s->mark >= 0) {
1076                 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1077                 if (r < 0)
1078                         log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1079         }
1080
1081         if (s->ip_tos >= 0) {
1082                 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1083                 if (r < 0)
1084                         log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1085         }
1086
1087         if (s->ip_ttl >= 0) {
1088                 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1089                 if (r < 0)
1090                         log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1091         }
1092
1093         if (s->tcp_congestion)
1094                 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1095                         log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1096
1097         if (s->smack_ip_in) {
1098                 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1099                 if (r < 0)
1100                         log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1101         }
1102
1103         if (s->smack_ip_out) {
1104                 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1105                 if (r < 0)
1106                         log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1107         }
1108 }
1109
1110 static void socket_apply_fifo_options(Socket *s, int fd) {
1111         int r;
1112
1113         assert(s);
1114         assert(fd >= 0);
1115
1116         if (s->pipe_size > 0)
1117                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1118                         log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1119
1120         if (s->smack) {
1121                 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1122                 if (r < 0)
1123                         log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1124         }
1125 }
1126
1127 static int fifo_address_create(
1128                 const char *path,
1129                 mode_t directory_mode,
1130                 mode_t socket_mode) {
1131
1132         _cleanup_close_ int fd = -1;
1133         mode_t old_mask;
1134         struct stat st;
1135         int r;
1136
1137         assert(path);
1138
1139         (void) mkdir_parents_label(path, directory_mode);
1140
1141         r = mac_selinux_create_file_prepare(path, S_IFIFO);
1142         if (r < 0)
1143                 return r;
1144
1145         /* Enforce the right access mode for the fifo */
1146         old_mask = umask(~socket_mode);
1147
1148         /* Include the original umask in our mask */
1149         (void) umask(~socket_mode | old_mask);
1150
1151         r = mkfifo(path, socket_mode);
1152         (void) umask(old_mask);
1153
1154         if (r < 0 && errno != EEXIST) {
1155                 r = -errno;
1156                 goto fail;
1157         }
1158
1159         fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1160         if (fd < 0) {
1161                 r = -errno;
1162                 goto fail;
1163         }
1164
1165         mac_selinux_create_file_clear();
1166
1167         if (fstat(fd, &st) < 0) {
1168                 r = -errno;
1169                 goto fail;
1170         }
1171
1172         if (!S_ISFIFO(st.st_mode) ||
1173             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1174             st.st_uid != getuid() ||
1175             st.st_gid != getgid()) {
1176                 r = -EEXIST;
1177                 goto fail;
1178         }
1179
1180         return TAKE_FD(fd);
1181
1182 fail:
1183         mac_selinux_create_file_clear();
1184         return r;
1185 }
1186
1187 static int special_address_create(const char *path, bool writable) {
1188         _cleanup_close_ int fd = -1;
1189         struct stat st;
1190
1191         assert(path);
1192
1193         fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1194         if (fd < 0)
1195                 return -errno;
1196
1197         if (fstat(fd, &st) < 0)
1198                 return -errno;
1199
1200         /* Check whether this is a /proc, /sys or /dev file or char device */
1201         if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1202                 return -EEXIST;
1203
1204         return TAKE_FD(fd);
1205 }
1206
1207 static int usbffs_address_create(const char *path) {
1208         _cleanup_close_ int fd = -1;
1209         struct stat st;
1210
1211         assert(path);
1212
1213         fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1214         if (fd < 0)
1215                 return -errno;
1216
1217         if (fstat(fd, &st) < 0)
1218                 return -errno;
1219
1220         /* Check whether this is a regular file (ffs endpoint) */
1221         if (!S_ISREG(st.st_mode))
1222                 return -EEXIST;
1223
1224         return TAKE_FD(fd);
1225 }
1226
1227 static int mq_address_create(
1228                 const char *path,
1229                 mode_t mq_mode,
1230                 long maxmsg,
1231                 long msgsize) {
1232
1233         _cleanup_close_ int fd = -1;
1234         struct stat st;
1235         mode_t old_mask;
1236         struct mq_attr _attr, *attr = NULL;
1237
1238         assert(path);
1239
1240         if (maxmsg > 0 && msgsize > 0) {
1241                 _attr = (struct mq_attr) {
1242                         .mq_flags = O_NONBLOCK,
1243                         .mq_maxmsg = maxmsg,
1244                         .mq_msgsize = msgsize,
1245                 };
1246                 attr = &_attr;
1247         }
1248
1249         /* Enforce the right access mode for the mq */
1250         old_mask = umask(~mq_mode);
1251
1252         /* Include the original umask in our mask */
1253         (void) umask(~mq_mode | old_mask);
1254         fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1255         (void) umask(old_mask);
1256
1257         if (fd < 0)
1258                 return -errno;
1259
1260         if (fstat(fd, &st) < 0)
1261                 return -errno;
1262
1263         if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1264             st.st_uid != getuid() ||
1265             st.st_gid != getgid())
1266                 return -EEXIST;
1267
1268         return TAKE_FD(fd);
1269 }
1270
1271 static int socket_symlink(Socket *s) {
1272         const char *p;
1273         char **i;
1274         int r;
1275
1276         assert(s);
1277
1278         p = socket_find_symlink_target(s);
1279         if (!p)
1280                 return 0;
1281
1282         STRV_FOREACH(i, s->symlinks) {
1283                 (void) mkdir_parents_label(*i, s->directory_mode);
1284
1285                 r = symlink_idempotent(p, *i, false);
1286
1287                 if (r == -EEXIST && s->remove_on_stop) {
1288                         /* If there's already something where we want to create the symlink, and the destructive
1289                          * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1290                          * again. */
1291
1292                         if (unlink(*i) >= 0)
1293                                 r = symlink_idempotent(p, *i, false);
1294                 }
1295
1296                 if (r < 0)
1297                         log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1298         }
1299
1300         return 0;
1301 }
1302
1303 static int usbffs_write_descs(int fd, Service *s) {
1304         int r;
1305
1306         if (!s->usb_function_descriptors || !s->usb_function_strings)
1307                 return -EINVAL;
1308
1309         r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1310         if (r < 0)
1311                 return r;
1312
1313         return copy_file_fd(s->usb_function_strings, fd, 0);
1314 }
1315
1316 static int usbffs_select_ep(const struct dirent *d) {
1317         return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1318 }
1319
1320 static int usbffs_dispatch_eps(SocketPort *p) {
1321         _cleanup_free_ struct dirent **ent = NULL;
1322         size_t n, k, i;
1323         int r;
1324
1325         r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1326         if (r < 0)
1327                 return -errno;
1328
1329         n = (size_t) r;
1330         p->auxiliary_fds = new(int, n);
1331         if (!p->auxiliary_fds) {
1332                 r = -ENOMEM;
1333                 goto clear;
1334         }
1335
1336         p->n_auxiliary_fds = n;
1337
1338         k = 0;
1339         for (i = 0; i < n; ++i) {
1340                 _cleanup_free_ char *ep = NULL;
1341
1342                 ep = path_make_absolute(ent[i]->d_name, p->path);
1343                 if (!ep) {
1344                         r = -ENOMEM;
1345                         goto fail;
1346                 }
1347
1348                 path_simplify(ep, false);
1349
1350                 r = usbffs_address_create(ep);
1351                 if (r < 0)
1352                         goto fail;
1353
1354                 p->auxiliary_fds[k++] = r;
1355         }
1356
1357         r = 0;
1358         goto clear;
1359
1360 fail:
1361         close_many(p->auxiliary_fds, k);
1362         p->auxiliary_fds = mfree(p->auxiliary_fds);
1363         p->n_auxiliary_fds = 0;
1364
1365 clear:
1366         for (i = 0; i < n; ++i)
1367                 free(ent[i]);
1368
1369         return r;
1370 }
1371
1372 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1373         /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1374          *
1375          * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1376          * instance name.
1377          */
1378
1379         if (UNIT_ISSET(s->service)) {
1380                 *ret = UNIT_DEREF(s->service);
1381                 return 0;
1382         }
1383
1384         if (!s->accept)
1385                 return -ENODATA;
1386
1387         /* Build the instance name and load the unit */
1388         _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1389         int r;
1390
1391         r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1392         if (r < 0)
1393                 return r;
1394
1395         if (cfd >= 0) {
1396                 r = instance_from_socket(cfd, s->n_accepted, &instance);
1397                 if (ERRNO_IS_DISCONNECT(r))
1398                         /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1399                          * different errors. This connection is over, but the socket unit lives on. */
1400                         return log_unit_debug_errno(UNIT(s), r,
1401                                                     "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1402                                                     errno_to_name(r));
1403                 if (r < 0)
1404                         return r;
1405         }
1406
1407         /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1408          * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1409          * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1410         r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1411         if (r < 0)
1412                 return r;
1413
1414         return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1415 }
1416
1417 static int socket_determine_selinux_label(Socket *s, char **ret) {
1418         int r;
1419
1420         assert(s);
1421         assert(ret);
1422
1423         if (s->selinux_context_from_net) {
1424                 /* If this is requested, get the label from the network label */
1425
1426                 r = mac_selinux_get_our_label(ret);
1427                 if (r == -EOPNOTSUPP)
1428                         goto no_label;
1429
1430         } else {
1431                 /* Otherwise, get it from the executable we are about to start. */
1432
1433                 Unit *service;
1434                 ExecCommand *c;
1435                 _cleanup_free_ char *path = NULL;
1436
1437                 r = socket_load_service_unit(s, -1, &service);
1438                 if (r == -ENODATA)
1439                         goto no_label;
1440                 if (r < 0)
1441                         return r;
1442
1443                 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1444                 if (!c)
1445                         goto no_label;
1446
1447                 r = chase_symlinks(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1448                 if (r < 0)
1449                         goto no_label;
1450
1451                 r = mac_selinux_get_create_label_from_exe(path, ret);
1452                 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1453                         goto no_label;
1454         }
1455
1456         return r;
1457
1458 no_label:
1459         *ret = NULL;
1460         return 0;
1461 }
1462
1463 static int socket_address_listen_do(
1464                 Socket *s,
1465                 const SocketAddress *address,
1466                 const char *label) {
1467
1468         assert(s);
1469         assert(address);
1470
1471         return socket_address_listen(
1472                         address,
1473                         SOCK_CLOEXEC|SOCK_NONBLOCK,
1474                         s->backlog,
1475                         s->bind_ipv6_only,
1476                         s->bind_to_device,
1477                         s->reuse_port,
1478                         s->free_bind,
1479                         s->transparent,
1480                         s->directory_mode,
1481                         s->socket_mode,
1482                         label);
1483 }
1484
1485 #define log_address_error_errno(u, address, error, fmt)          \
1486         ({                                                       \
1487                 _cleanup_free_ char *_t = NULL;                  \
1488                                                                  \
1489                 (void) socket_address_print(address, &_t);       \
1490                 log_unit_error_errno(u, error, fmt, strna(_t));  \
1491         })
1492
1493 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1494         int r;
1495
1496         assert(address);
1497         assert(context);
1498
1499         /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1500
1501         if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1502                 r = bpf_firewall_supported();
1503                 if (r < 0)
1504                         return r;
1505                 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1506                         return true;
1507         }
1508
1509         return context->private_network || context->network_namespace_path;
1510 }
1511
1512 static int socket_address_listen_in_cgroup(
1513                 Socket *s,
1514                 const SocketAddress *address,
1515                 const char *label) {
1516
1517         _cleanup_close_pair_ int pair[2] = { -1, -1 };
1518         int fd, r;
1519         pid_t pid;
1520
1521         assert(s);
1522         assert(address);
1523
1524         /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1525          * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1526          * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1527          * such. */
1528
1529         r = fork_needed(address, &s->exec_context);
1530         if (r < 0)
1531                 return r;
1532         if (r == 0) {
1533                 /* Shortcut things... */
1534                 fd = socket_address_listen_do(s, address, label);
1535                 if (fd < 0)
1536                         return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1537
1538                 return fd;
1539         }
1540
1541         r = unit_setup_exec_runtime(UNIT(s));
1542         if (r < 0)
1543                 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1544
1545         if (s->exec_context.network_namespace_path &&
1546             s->exec_runtime &&
1547             s->exec_runtime->netns_storage_socket[0] >= 0) {
1548                 r = open_netns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path);
1549                 if (r < 0)
1550                         return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1551         }
1552
1553         if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1554                 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1555
1556         r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1557         if (r < 0)
1558                 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1559         if (r == 0) {
1560                 /* Child */
1561
1562                 pair[0] = safe_close(pair[0]);
1563
1564                 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1565                     s->exec_runtime &&
1566                     s->exec_runtime->netns_storage_socket[0] >= 0) {
1567
1568                         if (ns_type_supported(NAMESPACE_NET)) {
1569                                 r = setup_netns(s->exec_runtime->netns_storage_socket);
1570                                 if (r < 0) {
1571                                         log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1572                                         _exit(EXIT_NETWORK);
1573                                 }
1574                         } else if (s->exec_context.network_namespace_path) {
1575                                 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1576                                 _exit(EXIT_NETWORK);
1577                         } else
1578                                 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1579                 }
1580
1581                 fd = socket_address_listen_do(s, address, label);
1582                 if (fd < 0) {
1583                         log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1584                         _exit(EXIT_FAILURE);
1585                 }
1586
1587                 r = send_one_fd(pair[1], fd, 0);
1588                 if (r < 0) {
1589                         log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1590                         _exit(EXIT_FAILURE);
1591                 }
1592
1593                 _exit(EXIT_SUCCESS);
1594         }
1595
1596         pair[1] = safe_close(pair[1]);
1597         fd = receive_one_fd(pair[0], 0);
1598
1599         /* We synchronously wait for the helper, as it shouldn't be slow */
1600         r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1601         if (r < 0) {
1602                 safe_close(fd);
1603                 return r;
1604         }
1605
1606         if (fd < 0)
1607                 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1608
1609         return fd;
1610 }
1611
1612 DEFINE_TRIVIAL_CLEANUP_FUNC(Socket *, socket_close_fds);
1613
1614 static int socket_open_fds(Socket *_s) {
1615         _cleanup_(socket_close_fdsp) Socket *s = _s;
1616         _cleanup_(mac_selinux_freep) char *label = NULL;
1617         bool know_label = false;
1618         SocketPort *p;
1619         int r;
1620
1621         assert(s);
1622
1623         LIST_FOREACH(port, p, s->ports) {
1624
1625                 if (p->fd >= 0)
1626                         continue;
1627
1628                 switch (p->type) {
1629
1630                 case SOCKET_SOCKET:
1631
1632                         if (!know_label) {
1633                                 /* Figure out the label, if we don't it know yet. We do it once for the first
1634                                  * socket where we need this and remember it for the rest. */
1635
1636                                 r = socket_determine_selinux_label(s, &label);
1637                                 if (r < 0)
1638                                         return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1639
1640                                 know_label = true;
1641                         }
1642
1643                         /* Apply the socket protocol */
1644                         switch (p->address.type) {
1645
1646                         case SOCK_STREAM:
1647                         case SOCK_SEQPACKET:
1648                                 if (s->socket_protocol == IPPROTO_SCTP)
1649                                         p->address.protocol = s->socket_protocol;
1650                                 break;
1651
1652                         case SOCK_DGRAM:
1653                                 if (s->socket_protocol == IPPROTO_UDPLITE)
1654                                         p->address.protocol = s->socket_protocol;
1655                                 break;
1656                         }
1657
1658                         p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1659                         if (p->fd < 0)
1660                                 return p->fd;
1661
1662                         socket_apply_socket_options(s, p, p->fd);
1663                         socket_symlink(s);
1664                         break;
1665
1666                 case SOCKET_SPECIAL:
1667
1668                         p->fd = special_address_create(p->path, s->writable);
1669                         if (p->fd < 0)
1670                                 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1671                         break;
1672
1673                 case SOCKET_FIFO:
1674
1675                         p->fd = fifo_address_create(
1676                                         p->path,
1677                                         s->directory_mode,
1678                                         s->socket_mode);
1679                         if (p->fd < 0)
1680                                 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1681
1682                         socket_apply_fifo_options(s, p->fd);
1683                         socket_symlink(s);
1684                         break;
1685
1686                 case SOCKET_MQUEUE:
1687
1688                         p->fd = mq_address_create(
1689                                         p->path,
1690                                         s->socket_mode,
1691                                         s->mq_maxmsg,
1692                                         s->mq_msgsize);
1693                         if (p->fd < 0)
1694                                 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1695                         break;
1696
1697                 case SOCKET_USB_FUNCTION: {
1698                         _cleanup_free_ char *ep = NULL;
1699
1700                         ep = path_make_absolute("ep0", p->path);
1701
1702                         p->fd = usbffs_address_create(ep);
1703                         if (p->fd < 0)
1704                                 return p->fd;
1705
1706                         r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1707                         if (r < 0)
1708                                 return r;
1709
1710                         r = usbffs_dispatch_eps(p);
1711                         if (r < 0)
1712                                 return r;
1713
1714                         break;
1715                 }
1716                 default:
1717                         assert_not_reached("Unknown port type");
1718                 }
1719         }
1720
1721         s = NULL;
1722         return 0;
1723 }
1724
1725 static void socket_unwatch_fds(Socket *s) {
1726         SocketPort *p;
1727         int r;
1728
1729         assert(s);
1730
1731         LIST_FOREACH(port, p, s->ports) {
1732                 if (p->fd < 0)
1733                         continue;
1734
1735                 if (!p->event_source)
1736                         continue;
1737
1738                 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1739                 if (r < 0)
1740                         log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1741         }
1742 }
1743
1744 static int socket_watch_fds(Socket *s) {
1745         SocketPort *p;
1746         int r;
1747
1748         assert(s);
1749
1750         LIST_FOREACH(port, p, s->ports) {
1751                 if (p->fd < 0)
1752                         continue;
1753
1754                 if (p->event_source) {
1755                         r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1756                         if (r < 0)
1757                                 goto fail;
1758                 } else {
1759                         r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1760                         if (r < 0)
1761                                 goto fail;
1762
1763                         (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1764                 }
1765         }
1766
1767         return 0;
1768
1769 fail:
1770         log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1771         socket_unwatch_fds(s);
1772         return r;
1773 }
1774
1775 enum {
1776         SOCKET_OPEN_NONE,
1777         SOCKET_OPEN_SOME,
1778         SOCKET_OPEN_ALL,
1779 };
1780
1781 static int socket_check_open(Socket *s) {
1782         bool have_open = false, have_closed = false;
1783         SocketPort *p;
1784
1785         assert(s);
1786
1787         LIST_FOREACH(port, p, s->ports) {
1788                 if (p->fd < 0)
1789                         have_closed = true;
1790                 else
1791                         have_open = true;
1792
1793                 if (have_open && have_closed)
1794                         return SOCKET_OPEN_SOME;
1795         }
1796
1797         if (have_open)
1798                 return SOCKET_OPEN_ALL;
1799
1800         return SOCKET_OPEN_NONE;
1801 }
1802
1803 static void socket_set_state(Socket *s, SocketState state) {
1804         SocketState old_state;
1805         assert(s);
1806
1807         if (s->state != state)
1808                 bus_unit_send_pending_change_signal(UNIT(s), false);
1809
1810         old_state = s->state;
1811         s->state = state;
1812
1813         if (!IN_SET(state,
1814                     SOCKET_START_PRE,
1815                     SOCKET_START_CHOWN,
1816                     SOCKET_START_POST,
1817                     SOCKET_STOP_PRE,
1818                     SOCKET_STOP_PRE_SIGTERM,
1819                     SOCKET_STOP_PRE_SIGKILL,
1820                     SOCKET_STOP_POST,
1821                     SOCKET_FINAL_SIGTERM,
1822                     SOCKET_FINAL_SIGKILL,
1823                     SOCKET_CLEANING)) {
1824
1825                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1826                 socket_unwatch_control_pid(s);
1827                 s->control_command = NULL;
1828                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1829         }
1830
1831         if (state != SOCKET_LISTENING)
1832                 socket_unwatch_fds(s);
1833
1834         if (!IN_SET(state,
1835                     SOCKET_START_CHOWN,
1836                     SOCKET_START_POST,
1837                     SOCKET_LISTENING,
1838                     SOCKET_RUNNING,
1839                     SOCKET_STOP_PRE,
1840                     SOCKET_STOP_PRE_SIGTERM,
1841                     SOCKET_STOP_PRE_SIGKILL,
1842                     SOCKET_CLEANING))
1843                 socket_close_fds(s);
1844
1845         if (state != old_state)
1846                 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1847
1848         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1849 }
1850
1851 static int socket_coldplug(Unit *u) {
1852         Socket *s = SOCKET(u);
1853         int r;
1854
1855         assert(s);
1856         assert(s->state == SOCKET_DEAD);
1857
1858         if (s->deserialized_state == s->state)
1859                 return 0;
1860
1861         if (s->control_pid > 0 &&
1862             pid_is_unwaited(s->control_pid) &&
1863             IN_SET(s->deserialized_state,
1864                    SOCKET_START_PRE,
1865                    SOCKET_START_CHOWN,
1866                    SOCKET_START_POST,
1867                    SOCKET_STOP_PRE,
1868                    SOCKET_STOP_PRE_SIGTERM,
1869                    SOCKET_STOP_PRE_SIGKILL,
1870                    SOCKET_STOP_POST,
1871                    SOCKET_FINAL_SIGTERM,
1872                    SOCKET_FINAL_SIGKILL,
1873                    SOCKET_CLEANING)) {
1874
1875                 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1876                 if (r < 0)
1877                         return r;
1878
1879                 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1880                 if (r < 0)
1881                         return r;
1882         }
1883
1884         if (IN_SET(s->deserialized_state,
1885                    SOCKET_START_CHOWN,
1886                    SOCKET_START_POST,
1887                    SOCKET_LISTENING,
1888                    SOCKET_RUNNING)) {
1889
1890                 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1891                  * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1892                  * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1893                  * and if there's a mismatch, warn loudly. */
1894
1895                 r = socket_check_open(s);
1896                 if (r == SOCKET_OPEN_NONE)
1897                         log_unit_warning(UNIT(s),
1898                                          "Socket unit configuration has changed while unit has been running, "
1899                                          "no open socket file descriptor left. "
1900                                          "The socket unit is not functional until restarted.");
1901                 else if (r == SOCKET_OPEN_SOME)
1902                         log_unit_warning(UNIT(s),
1903                                          "Socket unit configuration has changed while unit has been running, "
1904                                          "and some socket file descriptors have not been opened yet. "
1905                                          "The socket unit is not fully functional until restarted.");
1906         }
1907
1908         if (s->deserialized_state == SOCKET_LISTENING) {
1909                 r = socket_watch_fds(s);
1910                 if (r < 0)
1911                         return r;
1912         }
1913
1914         if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1915                 (void) unit_setup_dynamic_creds(u);
1916                 (void) unit_setup_exec_runtime(u);
1917         }
1918
1919         socket_set_state(s, s->deserialized_state);
1920         return 0;
1921 }
1922
1923 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1924
1925         _cleanup_(exec_params_clear) ExecParameters exec_params = {
1926                 .flags     = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1927                 .stdin_fd  = -1,
1928                 .stdout_fd = -1,
1929                 .stderr_fd = -1,
1930                 .exec_fd   = -1,
1931         };
1932         pid_t pid;
1933         int r;
1934
1935         assert(s);
1936         assert(c);
1937         assert(_pid);
1938
1939         r = unit_prepare_exec(UNIT(s));
1940         if (r < 0)
1941                 return r;
1942
1943         r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1944         if (r < 0)
1945                 return r;
1946
1947         r = unit_set_exec_params(UNIT(s), &exec_params);
1948         if (r < 0)
1949                 return r;
1950
1951         r = exec_spawn(UNIT(s),
1952                        c,
1953                        &s->exec_context,
1954                        &exec_params,
1955                        s->exec_runtime,
1956                        &s->dynamic_creds,
1957                        &pid);
1958         if (r < 0)
1959                 return r;
1960
1961         r = unit_watch_pid(UNIT(s), pid, true);
1962         if (r < 0)
1963                 return r;
1964
1965         *_pid = pid;
1966
1967         return 0;
1968 }
1969
1970 static int socket_chown(Socket *s, pid_t *_pid) {
1971         pid_t pid;
1972         int r;
1973
1974         r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1975         if (r < 0)
1976                 goto fail;
1977
1978         /* We have to resolve the user names out-of-process, hence
1979          * let's fork here. It's messy, but well, what can we do? */
1980
1981         r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1982         if (r < 0)
1983                 return r;
1984         if (r == 0) {
1985                 uid_t uid = UID_INVALID;
1986                 gid_t gid = GID_INVALID;
1987                 SocketPort *p;
1988
1989                 /* Child */
1990
1991                 if (!isempty(s->user)) {
1992                         const char *user = s->user;
1993
1994                         r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1995                         if (r < 0) {
1996                                 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1997                                 _exit(EXIT_USER);
1998                         }
1999                 }
2000
2001                 if (!isempty(s->group)) {
2002                         const char *group = s->group;
2003
2004                         r = get_group_creds(&group, &gid, 0);
2005                         if (r < 0) {
2006                                 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2007                                 _exit(EXIT_GROUP);
2008                         }
2009                 }
2010
2011                 LIST_FOREACH(port, p, s->ports) {
2012                         const char *path = NULL;
2013
2014                         if (p->type == SOCKET_SOCKET)
2015                                 path = socket_address_get_path(&p->address);
2016                         else if (p->type == SOCKET_FIFO)
2017                                 path = p->path;
2018
2019                         if (!path)
2020                                 continue;
2021
2022                         if (chown(path, uid, gid) < 0) {
2023                                 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2024                                 _exit(EXIT_CHOWN);
2025                         }
2026                 }
2027
2028                 _exit(EXIT_SUCCESS);
2029         }
2030
2031         r = unit_watch_pid(UNIT(s), pid, true);
2032         if (r < 0)
2033                 goto fail;
2034
2035         *_pid = pid;
2036         return 0;
2037
2038 fail:
2039         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
2040         return r;
2041 }
2042
2043 static void socket_enter_dead(Socket *s, SocketResult f) {
2044         assert(s);
2045
2046         if (s->result == SOCKET_SUCCESS)
2047                 s->result = f;
2048
2049         if (s->result == SOCKET_SUCCESS)
2050                 unit_log_success(UNIT(s));
2051         else
2052                 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2053
2054         unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2055
2056         socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2057
2058         s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2059
2060         unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2061
2062         unit_unref_uid_gid(UNIT(s), true);
2063
2064         dynamic_creds_destroy(&s->dynamic_creds);
2065 }
2066
2067 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2068
2069 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2070         int r;
2071         assert(s);
2072
2073         if (s->result == SOCKET_SUCCESS)
2074                 s->result = f;
2075
2076         socket_unwatch_control_pid(s);
2077         s->control_command_id = SOCKET_EXEC_STOP_POST;
2078         s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2079
2080         if (s->control_command) {
2081                 r = socket_spawn(s, s->control_command, &s->control_pid);
2082                 if (r < 0)
2083                         goto fail;
2084
2085                 socket_set_state(s, SOCKET_STOP_POST);
2086         } else
2087                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2088
2089         return;
2090
2091 fail:
2092         log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2093         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2094 }
2095
2096 static int state_to_kill_operation(Socket *s, SocketState state) {
2097         if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2098                 return KILL_RESTART;
2099
2100         if (state == SOCKET_FINAL_SIGTERM)
2101                 return KILL_TERMINATE;
2102
2103         return KILL_KILL;
2104 }
2105
2106 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2107         int r;
2108
2109         assert(s);
2110
2111         if (s->result == SOCKET_SUCCESS)
2112                 s->result = f;
2113
2114         r = unit_kill_context(
2115                         UNIT(s),
2116                         &s->kill_context,
2117                         state_to_kill_operation(s, state),
2118                         -1,
2119                         s->control_pid,
2120                         false);
2121         if (r < 0)
2122                 goto fail;
2123
2124         if (r > 0) {
2125                 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2126                 if (r < 0)
2127                         goto fail;
2128
2129                 socket_set_state(s, state);
2130         } else if (state == SOCKET_STOP_PRE_SIGTERM)
2131                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2132         else if (state == SOCKET_STOP_PRE_SIGKILL)
2133                 socket_enter_stop_post(s, SOCKET_SUCCESS);
2134         else if (state == SOCKET_FINAL_SIGTERM)
2135                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2136         else
2137                 socket_enter_dead(s, SOCKET_SUCCESS);
2138
2139         return;
2140
2141 fail:
2142         log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2143
2144         if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2145                 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2146         else
2147                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2148 }
2149
2150 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2151         int r;
2152         assert(s);
2153
2154         if (s->result == SOCKET_SUCCESS)
2155                 s->result = f;
2156
2157         socket_unwatch_control_pid(s);
2158         s->control_command_id = SOCKET_EXEC_STOP_PRE;
2159         s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2160
2161         if (s->control_command) {
2162                 r = socket_spawn(s, s->control_command, &s->control_pid);
2163                 if (r < 0)
2164                         goto fail;
2165
2166                 socket_set_state(s, SOCKET_STOP_PRE);
2167         } else
2168                 socket_enter_stop_post(s, SOCKET_SUCCESS);
2169
2170         return;
2171
2172 fail:
2173         log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2174         socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2175 }
2176
2177 static void socket_enter_listening(Socket *s) {
2178         int r;
2179         assert(s);
2180
2181         if (!s->accept && s->flush_pending) {
2182                 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2183                 flush_ports(s);
2184         }
2185
2186         r = socket_watch_fds(s);
2187         if (r < 0) {
2188                 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2189                 goto fail;
2190         }
2191
2192         socket_set_state(s, SOCKET_LISTENING);
2193         return;
2194
2195 fail:
2196         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2197 }
2198
2199 static void socket_enter_start_post(Socket *s) {
2200         int r;
2201         assert(s);
2202
2203         socket_unwatch_control_pid(s);
2204         s->control_command_id = SOCKET_EXEC_START_POST;
2205         s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2206
2207         if (s->control_command) {
2208                 r = socket_spawn(s, s->control_command, &s->control_pid);
2209                 if (r < 0) {
2210                         log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2211                         goto fail;
2212                 }
2213
2214                 socket_set_state(s, SOCKET_START_POST);
2215         } else
2216                 socket_enter_listening(s);
2217
2218         return;
2219
2220 fail:
2221         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2222 }
2223
2224 static void socket_enter_start_chown(Socket *s) {
2225         int r;
2226
2227         assert(s);
2228
2229         r = socket_open_fds(s);
2230         if (r < 0) {
2231                 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2232                 goto fail;
2233         }
2234
2235         if (!isempty(s->user) || !isempty(s->group)) {
2236
2237                 socket_unwatch_control_pid(s);
2238                 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2239                 s->control_command = NULL;
2240
2241                 r = socket_chown(s, &s->control_pid);
2242                 if (r < 0) {
2243                         log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2244                         goto fail;
2245                 }
2246
2247                 socket_set_state(s, SOCKET_START_CHOWN);
2248         } else
2249                 socket_enter_start_post(s);
2250
2251         return;
2252
2253 fail:
2254         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2255 }
2256
2257 static void socket_enter_start_pre(Socket *s) {
2258         int r;
2259         assert(s);
2260
2261         socket_unwatch_control_pid(s);
2262
2263         unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2264
2265         s->control_command_id = SOCKET_EXEC_START_PRE;
2266         s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2267
2268         if (s->control_command) {
2269                 r = socket_spawn(s, s->control_command, &s->control_pid);
2270                 if (r < 0) {
2271                         log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2272                         goto fail;
2273                 }
2274
2275                 socket_set_state(s, SOCKET_START_PRE);
2276         } else
2277                 socket_enter_start_chown(s);
2278
2279         return;
2280
2281 fail:
2282         socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2283 }
2284
2285 static void flush_ports(Socket *s) {
2286         SocketPort *p;
2287
2288         /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2289          * anymore */
2290
2291         LIST_FOREACH(port, p, s->ports) {
2292                 if (p->fd < 0)
2293                         continue;
2294
2295                 (void) flush_accept(p->fd);
2296                 (void) flush_fd(p->fd);
2297         }
2298 }
2299
2300 static void socket_enter_running(Socket *s, int cfd_in) {
2301         /* Note that this call takes possession of the connection fd passed. It either has to assign it
2302          * somewhere or close it. */
2303         _cleanup_close_ int cfd = cfd_in;
2304
2305         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2306         int r;
2307
2308         assert(s);
2309
2310         /* We don't take connections anymore if we are supposed to shut down anyway */
2311         if (unit_stop_pending(UNIT(s))) {
2312
2313                 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2314
2315                 if (cfd >= 0)
2316                         goto refuse;
2317
2318                 flush_ports(s);
2319                 return;
2320         }
2321
2322         if (!ratelimit_below(&s->trigger_limit)) {
2323                 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2324                 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2325                 goto refuse;
2326         }
2327
2328         if (cfd < 0) {
2329                 bool pending = false;
2330                 Unit *other;
2331                 void *v;
2332
2333                 /* If there's already a start pending don't bother to
2334                  * do anything */
2335                 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS])
2336                         if (unit_active_or_pending(other)) {
2337                                 pending = true;
2338                                 break;
2339                         }
2340
2341                 if (!pending) {
2342                         if (!UNIT_ISSET(s->service)) {
2343                                 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2344                                                          "Service to activate vanished, refusing activation.");
2345                                 goto fail;
2346                         }
2347
2348                         r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2349                         if (r < 0)
2350                                 goto fail;
2351                 }
2352
2353                 socket_set_state(s, SOCKET_RUNNING);
2354         } else {
2355                 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2356                 Unit *service;
2357
2358                 if (s->n_connections >= s->max_connections) {
2359                         log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2360                                          s->n_connections);
2361                         goto refuse;
2362                 }
2363
2364                 if (s->max_connections_per_source > 0) {
2365                         r = socket_acquire_peer(s, cfd, &p);
2366                         if (ERRNO_IS_DISCONNECT(r))
2367                                 return;
2368                         if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2369                                 goto fail;
2370                         if (r > 0 && p->n_ref > s->max_connections_per_source) {
2371                                 _cleanup_free_ char *t = NULL;
2372
2373                                 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2374
2375                                 log_unit_warning(UNIT(s),
2376                                                  "Too many incoming connections (%u) from source %s, dropping connection.",
2377                                                  p->n_ref, strnull(t));
2378                                 goto refuse;
2379                         }
2380                 }
2381
2382                 r = socket_load_service_unit(s, cfd, &service);
2383                 if (ERRNO_IS_DISCONNECT(r))
2384                         return;
2385                 if (r < 0)
2386                         goto fail;
2387
2388                 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2389                                               false, UNIT_DEPENDENCY_IMPLICIT);
2390                 if (r < 0)
2391                         goto fail;
2392
2393                 s->n_accepted++;
2394
2395                 r = service_set_socket_fd(SERVICE(service), cfd, s, s->selinux_context_from_net);
2396                 if (ERRNO_IS_DISCONNECT(r))
2397                         return;
2398                 if (r < 0)
2399                         goto fail;
2400
2401                 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2402                 s->n_connections++;
2403
2404                 SERVICE(service)->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2405
2406                 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2407                 if (r < 0) {
2408                         /* We failed to activate the new service, but it still exists. Let's make sure the
2409                          * service closes and forgets the connection fd again, immediately. */
2410                         service_close_socket_fd(SERVICE(service));
2411                         goto fail;
2412                 }
2413
2414                 /* Notify clients about changed counters */
2415                 unit_add_to_dbus_queue(UNIT(s));
2416         }
2417
2418         TAKE_FD(cfd);
2419         return;
2420
2421 refuse:
2422         s->n_refused++;
2423         return;
2424
2425 fail:
2426         if (ERRNO_IS_RESOURCE(r))
2427                 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2428                                  bus_error_message(&error, r));
2429         else
2430                 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2431                                  cfd >= 0 ? "template" : "non-template",
2432                                  bus_error_message(&error, r));
2433
2434         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2435 }
2436
2437 static void socket_run_next(Socket *s) {
2438         int r;
2439
2440         assert(s);
2441         assert(s->control_command);
2442         assert(s->control_command->command_next);
2443
2444         socket_unwatch_control_pid(s);
2445
2446         s->control_command = s->control_command->command_next;
2447
2448         r = socket_spawn(s, s->control_command, &s->control_pid);
2449         if (r < 0)
2450                 goto fail;
2451
2452         return;
2453
2454 fail:
2455         log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2456
2457         if (s->state == SOCKET_START_POST)
2458                 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2459         else if (s->state == SOCKET_STOP_POST)
2460                 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2461         else
2462                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2463 }
2464
2465 static int socket_start(Unit *u) {
2466         Socket *s = SOCKET(u);
2467         int r;
2468
2469         assert(s);
2470
2471         /* We cannot fulfill this request right now, try again later
2472          * please! */
2473         if (IN_SET(s->state,
2474                    SOCKET_STOP_PRE,
2475                    SOCKET_STOP_PRE_SIGKILL,
2476                    SOCKET_STOP_PRE_SIGTERM,
2477                    SOCKET_STOP_POST,
2478                    SOCKET_FINAL_SIGTERM,
2479                    SOCKET_FINAL_SIGKILL,
2480                    SOCKET_CLEANING))
2481                 return -EAGAIN;
2482
2483         /* Already on it! */
2484         if (IN_SET(s->state,
2485                    SOCKET_START_PRE,
2486                    SOCKET_START_CHOWN,
2487                    SOCKET_START_POST))
2488                 return 0;
2489
2490         /* Cannot run this without the service being around */
2491         if (UNIT_ISSET(s->service)) {
2492                 Service *service;
2493
2494                 service = SERVICE(UNIT_DEREF(s->service));
2495
2496                 if (UNIT(service)->load_state != UNIT_LOADED) {
2497                         log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2498                         return -ENOENT;
2499                 }
2500
2501                 /* If the service is already active we cannot start the
2502                  * socket */
2503                 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2504                         log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2505                         return -EBUSY;
2506                 }
2507         }
2508
2509         assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2510
2511         r = unit_test_start_limit(u);
2512         if (r < 0) {
2513                 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2514                 return r;
2515         }
2516
2517         r = unit_acquire_invocation_id(u);
2518         if (r < 0)
2519                 return r;
2520
2521         s->result = SOCKET_SUCCESS;
2522         exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2523
2524         u->reset_accounting = true;
2525
2526         socket_enter_start_pre(s);
2527         return 1;
2528 }
2529
2530 static int socket_stop(Unit *u) {
2531         Socket *s = SOCKET(u);
2532
2533         assert(s);
2534
2535         /* Already on it */
2536         if (IN_SET(s->state,
2537                    SOCKET_STOP_PRE,
2538                    SOCKET_STOP_PRE_SIGTERM,
2539                    SOCKET_STOP_PRE_SIGKILL,
2540                    SOCKET_STOP_POST,
2541                    SOCKET_FINAL_SIGTERM,
2542                    SOCKET_FINAL_SIGKILL))
2543                 return 0;
2544
2545         /* If there's already something running we go directly into
2546          * kill mode. */
2547         if (IN_SET(s->state,
2548                    SOCKET_START_PRE,
2549                    SOCKET_START_CHOWN,
2550                    SOCKET_START_POST)) {
2551                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2552                 return -EAGAIN;
2553         }
2554
2555         /* If we are currently cleaning, then abort it, brutally. */
2556         if (s->state == SOCKET_CLEANING) {
2557                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2558                 return 0;
2559         }
2560
2561         assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2562
2563         socket_enter_stop_pre(s, SOCKET_SUCCESS);
2564         return 1;
2565 }
2566
2567 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2568         Socket *s = SOCKET(u);
2569         SocketPort *p;
2570         int r;
2571
2572         assert(u);
2573         assert(f);
2574         assert(fds);
2575
2576         (void) serialize_item(f, "state", socket_state_to_string(s->state));
2577         (void) serialize_item(f, "result", socket_result_to_string(s->result));
2578         (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2579         (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2580
2581         if (s->control_pid > 0)
2582                 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2583
2584         if (s->control_command_id >= 0)
2585                 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2586
2587         LIST_FOREACH(port, p, s->ports) {
2588                 int copy;
2589
2590                 if (p->fd < 0)
2591                         continue;
2592
2593                 copy = fdset_put_dup(fds, p->fd);
2594                 if (copy < 0)
2595                         return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2596
2597                 if (p->type == SOCKET_SOCKET) {
2598                         _cleanup_free_ char *t = NULL;
2599
2600                         r = socket_address_print(&p->address, &t);
2601                         if (r < 0)
2602                                 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2603
2604                         if (socket_address_family(&p->address) == AF_NETLINK)
2605                                 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2606                         else
2607                                 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2608                 } else if (p->type == SOCKET_SPECIAL)
2609                         (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2610                 else if (p->type == SOCKET_MQUEUE)
2611                         (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2612                 else if (p->type == SOCKET_USB_FUNCTION)
2613                         (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2614                 else {
2615                         assert(p->type == SOCKET_FIFO);
2616                         (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2617                 }
2618         }
2619
2620         return 0;
2621 }
2622
2623 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2624         assert(p);
2625
2626         safe_close(p->fd);
2627         p->fd = fdset_remove(fds, fd);
2628 }
2629
2630 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2631         Socket *s = SOCKET(u);
2632
2633         assert(u);
2634         assert(key);
2635         assert(value);
2636
2637         if (streq(key, "state")) {
2638                 SocketState state;
2639
2640                 state = socket_state_from_string(value);
2641                 if (state < 0)
2642                         log_unit_debug(u, "Failed to parse state value: %s", value);
2643                 else
2644                         s->deserialized_state = state;
2645         } else if (streq(key, "result")) {
2646                 SocketResult f;
2647
2648                 f = socket_result_from_string(value);
2649                 if (f < 0)
2650                         log_unit_debug(u, "Failed to parse result value: %s", value);
2651                 else if (f != SOCKET_SUCCESS)
2652                         s->result = f;
2653
2654         } else if (streq(key, "n-accepted")) {
2655                 unsigned k;
2656
2657                 if (safe_atou(value, &k) < 0)
2658                         log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2659                 else
2660                         s->n_accepted += k;
2661         } else if (streq(key, "n-refused")) {
2662                 unsigned k;
2663
2664                 if (safe_atou(value, &k) < 0)
2665                         log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2666                 else
2667                         s->n_refused += k;
2668         } else if (streq(key, "control-pid")) {
2669                 pid_t pid;
2670
2671                 if (parse_pid(value, &pid) < 0)
2672                         log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2673                 else
2674                         s->control_pid = pid;
2675         } else if (streq(key, "control-command")) {
2676                 SocketExecCommand id;
2677
2678                 id = socket_exec_command_from_string(value);
2679                 if (id < 0)
2680                         log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2681                 else {
2682                         s->control_command_id = id;
2683                         s->control_command = s->exec_command[id];
2684                 }
2685         } else if (streq(key, "fifo")) {
2686                 int fd, skip = 0;
2687                 SocketPort *p;
2688
2689                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2690                         log_unit_debug(u, "Failed to parse fifo value: %s", value);
2691                 else
2692                         LIST_FOREACH(port, p, s->ports)
2693                                 if (p->type == SOCKET_FIFO &&
2694                                     path_equal_or_files_same(p->path, value+skip, 0)) {
2695                                         socket_port_take_fd(p, fds, fd);
2696                                         break;
2697                                 }
2698
2699         } else if (streq(key, "special")) {
2700                 int fd, skip = 0;
2701                 SocketPort *p;
2702
2703                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2704                         log_unit_debug(u, "Failed to parse special value: %s", value);
2705                 else
2706                         LIST_FOREACH(port, p, s->ports)
2707                                 if (p->type == SOCKET_SPECIAL &&
2708                                     path_equal_or_files_same(p->path, value+skip, 0)) {
2709                                         socket_port_take_fd(p, fds, fd);
2710                                         break;
2711                                 }
2712
2713         } else if (streq(key, "mqueue")) {
2714                 int fd, skip = 0;
2715                 SocketPort *p;
2716
2717                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2718                         log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2719                 else
2720                         LIST_FOREACH(port, p, s->ports)
2721                                 if (p->type == SOCKET_MQUEUE &&
2722                                     streq(p->path, value+skip)) {
2723                                         socket_port_take_fd(p, fds, fd);
2724                                         break;
2725                                 }
2726
2727         } else if (streq(key, "socket")) {
2728                 int fd, type, skip = 0;
2729                 SocketPort *p;
2730
2731                 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2732                         log_unit_debug(u, "Failed to parse socket value: %s", value);
2733                 else
2734                         LIST_FOREACH(port, p, s->ports)
2735                                 if (socket_address_is(&p->address, value+skip, type)) {
2736                                         socket_port_take_fd(p, fds, fd);
2737                                         break;
2738                                 }
2739
2740         } else if (streq(key, "netlink")) {
2741                 int fd, skip = 0;
2742                 SocketPort *p;
2743
2744                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2745                         log_unit_debug(u, "Failed to parse socket value: %s", value);
2746                 else
2747                         LIST_FOREACH(port, p, s->ports)
2748                                 if (socket_address_is_netlink(&p->address, value+skip)) {
2749                                         socket_port_take_fd(p, fds, fd);
2750                                         break;
2751                                 }
2752
2753         } else if (streq(key, "ffs")) {
2754                 int fd, skip = 0;
2755                 SocketPort *p;
2756
2757                 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2758                         log_unit_debug(u, "Failed to parse ffs value: %s", value);
2759                 else
2760                         LIST_FOREACH(port, p, s->ports)
2761                                 if (p->type == SOCKET_USB_FUNCTION &&
2762                                     path_equal_or_files_same(p->path, value+skip, 0)) {
2763                                         socket_port_take_fd(p, fds, fd);
2764                                         break;
2765                                 }
2766
2767         } else
2768                 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2769
2770         return 0;
2771 }
2772
2773 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2774         Socket *s = SOCKET(u);
2775         SocketPort *p;
2776
2777         assert(u);
2778
2779         LIST_FOREACH(port, p, s->ports) {
2780                 int fd;
2781
2782                 if (p->type != SOCKET_SOCKET)
2783                         continue;
2784
2785                 if (p->fd >= 0)
2786                         continue;
2787
2788                 FDSET_FOREACH(fd, fds) {
2789                         if (socket_address_matches_fd(&p->address, fd)) {
2790                                 p->fd = fdset_remove(fds, fd);
2791                                 s->deserialized_state = SOCKET_LISTENING;
2792                                 break;
2793                         }
2794                 }
2795         }
2796 }
2797
2798 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2799         assert(u);
2800
2801         return state_translation_table[SOCKET(u)->state];
2802 }
2803
2804 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2805         assert(u);
2806
2807         return socket_state_to_string(SOCKET(u)->state);
2808 }
2809
2810 const char* socket_port_type_to_string(SocketPort *p) {
2811
2812         assert(p);
2813
2814         switch (p->type) {
2815
2816         case SOCKET_SOCKET:
2817
2818                 switch (p->address.type) {
2819
2820                 case SOCK_STREAM:
2821                         return "Stream";
2822
2823                 case SOCK_DGRAM:
2824                         return "Datagram";
2825
2826                 case SOCK_SEQPACKET:
2827                         return "SequentialPacket";
2828
2829                 case SOCK_RAW:
2830                         if (socket_address_family(&p->address) == AF_NETLINK)
2831                                 return "Netlink";
2832
2833                         _fallthrough_;
2834                 default:
2835                         return NULL;
2836                 }
2837
2838         case SOCKET_SPECIAL:
2839                 return "Special";
2840
2841         case SOCKET_MQUEUE:
2842                 return "MessageQueue";
2843
2844         case SOCKET_FIFO:
2845                 return "FIFO";
2846
2847         case SOCKET_USB_FUNCTION:
2848                 return "USBFunction";
2849
2850         default:
2851                 return NULL;
2852         }
2853 }
2854
2855 SocketType socket_port_type_from_string(const char *s) {
2856         assert(s);
2857
2858         if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2859                 return SOCKET_SOCKET;
2860         else if (streq(s, "Special"))
2861                 return SOCKET_SPECIAL;
2862         else if (streq(s, "MessageQueue"))
2863                 return SOCKET_MQUEUE;
2864         else if (streq(s, "FIFO"))
2865                 return SOCKET_FIFO;
2866         else if (streq(s, "USBFunction"))
2867                 return SOCKET_USB_FUNCTION;
2868         else
2869                 return _SOCKET_TYPE_INVALID;
2870 }
2871
2872 _pure_ static bool socket_may_gc(Unit *u) {
2873         Socket *s = SOCKET(u);
2874
2875         assert(u);
2876
2877         return s->n_connections == 0;
2878 }
2879
2880 static int socket_accept_do(Socket *s, int fd) {
2881         int cfd;
2882
2883         assert(s);
2884         assert(fd >= 0);
2885
2886         cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2887         if (cfd < 0)
2888                 /* Convert transient network errors into clean and well-defined EAGAIN */
2889                 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2890
2891         return cfd;
2892 }
2893
2894 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2895         _cleanup_close_pair_ int pair[2] = { -1, -1 };
2896         int cfd, r;
2897         pid_t pid;
2898
2899         assert(s);
2900         assert(p);
2901         assert(fd >= 0);
2902
2903         /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2904          * connection socket is also properly associated with the cgroup. */
2905
2906         if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2907                 goto shortcut;
2908
2909         r = bpf_firewall_supported();
2910         if (r < 0)
2911                 return r;
2912         if (r == BPF_FIREWALL_UNSUPPORTED)
2913                 goto shortcut;
2914
2915         if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2916                 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2917
2918         r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2919         if (r < 0)
2920                 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2921         if (r == 0) {
2922                 /* Child */
2923
2924                 pair[0] = safe_close(pair[0]);
2925
2926                 cfd = socket_accept_do(s, fd);
2927                 if (cfd == -EAGAIN) /* spurious accept() */
2928                         _exit(EXIT_SUCCESS);
2929                 if (cfd < 0) {
2930                         log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2931                         _exit(EXIT_FAILURE);
2932                 }
2933
2934                 r = send_one_fd(pair[1], cfd, 0);
2935                 if (r < 0) {
2936                         log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2937                         _exit(EXIT_FAILURE);
2938                 }
2939
2940                 _exit(EXIT_SUCCESS);
2941         }
2942
2943         pair[1] = safe_close(pair[1]);
2944         cfd = receive_one_fd(pair[0], 0);
2945
2946         /* We synchronously wait for the helper, as it shouldn't be slow */
2947         r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2948         if (r < 0) {
2949                 safe_close(cfd);
2950                 return r;
2951         }
2952
2953         /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2954          * this is a spurious accept(), let's convert that back to EAGAIN here. */
2955         if (cfd == -EIO)
2956                 return -EAGAIN;
2957         if (cfd < 0)
2958                 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2959
2960         return cfd;
2961
2962 shortcut:
2963         cfd = socket_accept_do(s, fd);
2964         if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
2965                 return -EAGAIN;
2966         if (cfd < 0)
2967                 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2968
2969         return cfd;
2970 }
2971
2972 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2973         SocketPort *p = userdata;
2974         int cfd = -1;
2975
2976         assert(p);
2977         assert(fd >= 0);
2978
2979         if (p->socket->state != SOCKET_LISTENING)
2980                 return 0;
2981
2982         log_unit_debug(UNIT(p->socket), "Incoming traffic");
2983
2984         if (revents != EPOLLIN) {
2985                 if (revents & EPOLLHUP)
2986                         log_unit_error(UNIT(p->socket), "Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.");
2987                 else
2988                         log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2989                 goto fail;
2990         }
2991
2992         if (p->socket->accept &&
2993             p->type == SOCKET_SOCKET &&
2994             socket_address_can_accept(&p->address)) {
2995
2996                 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2997                 if (cfd == -EAGAIN) /* Spurious accept() */
2998                         return 0;
2999                 if (cfd < 0)
3000                         goto fail;
3001
3002                 socket_apply_socket_options(p->socket, p, cfd);
3003         }
3004
3005         socket_enter_running(p->socket, cfd);
3006         return 0;
3007
3008 fail:
3009         socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3010         return 0;
3011 }
3012
3013 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3014         Socket *s = SOCKET(u);
3015         SocketResult f;
3016
3017         assert(s);
3018         assert(pid >= 0);
3019
3020         if (pid != s->control_pid)
3021                 return;
3022
3023         s->control_pid = 0;
3024
3025         if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3026                 f = SOCKET_SUCCESS;
3027         else if (code == CLD_EXITED)
3028                 f = SOCKET_FAILURE_EXIT_CODE;
3029         else if (code == CLD_KILLED)
3030                 f = SOCKET_FAILURE_SIGNAL;
3031         else if (code == CLD_DUMPED)
3032                 f = SOCKET_FAILURE_CORE_DUMP;
3033         else
3034                 assert_not_reached("Unknown sigchld code");
3035
3036         if (s->control_command) {
3037                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3038
3039                 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3040                         f = SOCKET_SUCCESS;
3041         }
3042
3043         unit_log_process_exit(
3044                         u,
3045                         "Control process",
3046                         socket_exec_command_to_string(s->control_command_id),
3047                         f == SOCKET_SUCCESS,
3048                         code, status);
3049
3050         if (s->result == SOCKET_SUCCESS)
3051                 s->result = f;
3052
3053         if (s->control_command &&
3054             s->control_command->command_next &&
3055             f == SOCKET_SUCCESS) {
3056
3057                 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3058                 socket_run_next(s);
3059         } else {
3060                 s->control_command = NULL;
3061                 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3062
3063                 /* No further commands for this step, so let's figure
3064                  * out what to do next */
3065
3066                 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3067
3068                 switch (s->state) {
3069
3070                 case SOCKET_START_PRE:
3071                         if (f == SOCKET_SUCCESS)
3072                                 socket_enter_start_chown(s);
3073                         else
3074                                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3075                         break;
3076
3077                 case SOCKET_START_CHOWN:
3078                         if (f == SOCKET_SUCCESS)
3079                                 socket_enter_start_post(s);
3080                         else
3081                                 socket_enter_stop_pre(s, f);
3082                         break;
3083
3084                 case SOCKET_START_POST:
3085                         if (f == SOCKET_SUCCESS)
3086                                 socket_enter_listening(s);
3087                         else
3088                                 socket_enter_stop_pre(s, f);
3089                         break;
3090
3091                 case SOCKET_STOP_PRE:
3092                 case SOCKET_STOP_PRE_SIGTERM:
3093                 case SOCKET_STOP_PRE_SIGKILL:
3094                         socket_enter_stop_post(s, f);
3095                         break;
3096
3097                 case SOCKET_STOP_POST:
3098                 case SOCKET_FINAL_SIGTERM:
3099                 case SOCKET_FINAL_SIGKILL:
3100                         socket_enter_dead(s, f);
3101                         break;
3102
3103                 case SOCKET_CLEANING:
3104
3105                         if (s->clean_result == SOCKET_SUCCESS)
3106                                 s->clean_result = f;
3107
3108                         socket_enter_dead(s, SOCKET_SUCCESS);
3109                         break;
3110
3111                 default:
3112                         assert_not_reached("Uh, control process died at wrong time.");
3113                 }
3114         }
3115
3116         /* Notify clients about changed exit status */
3117         unit_add_to_dbus_queue(u);
3118 }
3119
3120 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3121         Socket *s = SOCKET(userdata);
3122
3123         assert(s);
3124         assert(s->timer_event_source == source);
3125
3126         switch (s->state) {
3127
3128         case SOCKET_START_PRE:
3129                 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3130                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3131                 break;
3132
3133         case SOCKET_START_CHOWN:
3134         case SOCKET_START_POST:
3135                 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3136                 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3137                 break;
3138
3139         case SOCKET_STOP_PRE:
3140                 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3141                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3142                 break;
3143
3144         case SOCKET_STOP_PRE_SIGTERM:
3145                 if (s->kill_context.send_sigkill) {
3146                         log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3147                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3148                 } else {
3149                         log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3150                         socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3151                 }
3152                 break;
3153
3154         case SOCKET_STOP_PRE_SIGKILL:
3155                 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3156                 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3157                 break;
3158
3159         case SOCKET_STOP_POST:
3160                 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3161                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3162                 break;
3163
3164         case SOCKET_FINAL_SIGTERM:
3165                 if (s->kill_context.send_sigkill) {
3166                         log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3167                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3168                 } else {
3169                         log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3170                         socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3171                 }
3172                 break;
3173
3174         case SOCKET_FINAL_SIGKILL:
3175                 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3176                 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3177                 break;
3178
3179         case SOCKET_CLEANING:
3180                 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3181
3182                 if (s->clean_result == SOCKET_SUCCESS)
3183                         s->clean_result = SOCKET_FAILURE_TIMEOUT;
3184
3185                 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3186                 break;
3187
3188         default:
3189                 assert_not_reached("Timeout at wrong time.");
3190         }
3191
3192         return 0;
3193 }
3194
3195 int socket_collect_fds(Socket *s, int **fds) {
3196         size_t k = 0, n = 0;
3197         SocketPort *p;
3198         int *rfds;
3199
3200         assert(s);
3201         assert(fds);
3202
3203         /* Called from the service code for requesting our fds */
3204
3205         LIST_FOREACH(port, p, s->ports) {
3206                 if (p->fd >= 0)
3207                         n++;
3208                 n += p->n_auxiliary_fds;
3209         }
3210
3211         if (n <= 0) {
3212                 *fds = NULL;
3213                 return 0;
3214         }
3215
3216         rfds = new(int, n);
3217         if (!rfds)
3218                 return -ENOMEM;
3219
3220         LIST_FOREACH(port, p, s->ports) {
3221                 size_t i;
3222
3223                 if (p->fd >= 0)
3224                         rfds[k++] = p->fd;
3225                 for (i = 0; i < p->n_auxiliary_fds; ++i)
3226                         rfds[k++] = p->auxiliary_fds[i];
3227         }
3228
3229         assert(k == n);
3230
3231         *fds = rfds;
3232         return (int) n;
3233 }
3234
3235 static void socket_reset_failed(Unit *u) {
3236         Socket *s = SOCKET(u);
3237
3238         assert(s);
3239
3240         if (s->state == SOCKET_FAILED)
3241                 socket_set_state(s, SOCKET_DEAD);
3242
3243         s->result = SOCKET_SUCCESS;
3244         s->clean_result = SOCKET_SUCCESS;
3245 }
3246
3247 void socket_connection_unref(Socket *s) {
3248         assert(s);
3249
3250         /* The service is dead. Yay!
3251          *
3252          * This is strictly for one-instance-per-connection
3253          * services. */
3254
3255         assert(s->n_connections > 0);
3256         s->n_connections--;
3257
3258         log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3259 }
3260
3261 static void socket_trigger_notify(Unit *u, Unit *other) {
3262         Socket *s = SOCKET(u);
3263
3264         assert(u);
3265         assert(other);
3266
3267         /* Filter out invocations with bogus state */
3268         assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3269         assert(other->type == UNIT_SERVICE);
3270
3271         /* Don't propagate state changes from the service if we are already down */
3272         if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3273                 return;
3274
3275         /* We don't care for the service state if we are in Accept=yes mode */
3276         if (s->accept)
3277                 return;
3278
3279         /* Propagate start limit hit state */
3280         if (other->start_limit_hit) {
3281                 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3282                 return;
3283         }
3284
3285         /* Don't propagate anything if there's still a job queued */
3286         if (other->job)
3287                 return;
3288
3289         if (IN_SET(SERVICE(other)->state,
3290                    SERVICE_DEAD, SERVICE_FAILED,
3291                    SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3292                    SERVICE_AUTO_RESTART))
3293                socket_enter_listening(s);
3294
3295         if (SERVICE(other)->state == SERVICE_RUNNING)
3296                 socket_set_state(s, SOCKET_RUNNING);
3297 }
3298
3299 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3300         return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3301 }
3302
3303 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3304         Socket *s = SOCKET(u);
3305         usec_t t;
3306         int r;
3307
3308         if (!s->timer_event_source)
3309                 return 0;
3310
3311         r = sd_event_source_get_time(s->timer_event_source, &t);
3312         if (r < 0)
3313                 return r;
3314         if (t == USEC_INFINITY)
3315                 return 0;
3316
3317         *timeout = t;
3318         return 1;
3319 }
3320
3321 char *socket_fdname(Socket *s) {
3322         assert(s);
3323
3324         /* Returns the name to use for $LISTEN_NAMES. If the user
3325          * didn't specify anything specifically, use the socket unit's
3326          * name as fallback. */
3327
3328         return s->fdname ?: UNIT(s)->id;
3329 }
3330
3331 static int socket_control_pid(Unit *u) {
3332         Socket *s = SOCKET(u);
3333
3334         assert(s);
3335
3336         return s->control_pid;
3337 }
3338
3339 static int socket_clean(Unit *u, ExecCleanMask mask) {
3340         _cleanup_strv_free_ char **l = NULL;
3341         Socket *s = SOCKET(u);
3342         int r;
3343
3344         assert(s);
3345         assert(mask != 0);
3346
3347         if (s->state != SOCKET_DEAD)
3348                 return -EBUSY;
3349
3350         r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3351         if (r < 0)
3352                 return r;
3353
3354         if (strv_isempty(l))
3355                 return -EUNATCH;
3356
3357         socket_unwatch_control_pid(s);
3358         s->clean_result = SOCKET_SUCCESS;
3359         s->control_command = NULL;
3360         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3361
3362         r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3363         if (r < 0)
3364                 goto fail;
3365
3366         r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3367         if (r < 0)
3368                 goto fail;
3369
3370         socket_set_state(s, SOCKET_CLEANING);
3371
3372         return 0;
3373
3374 fail:
3375         log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3376         s->clean_result = SOCKET_FAILURE_RESOURCES;
3377         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
3378         return r;
3379 }
3380
3381 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3382         Socket *s = SOCKET(u);
3383
3384         assert(s);
3385
3386         return exec_context_get_clean_mask(&s->exec_context, ret);
3387 }
3388
3389 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3390         [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3391         [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3392         [SOCKET_EXEC_START_POST] = "ExecStartPost",
3393         [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3394         [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3395 };
3396
3397 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3398
3399 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3400         [SOCKET_SUCCESS] = "success",
3401         [SOCKET_FAILURE_RESOURCES] = "resources",
3402         [SOCKET_FAILURE_TIMEOUT] = "timeout",
3403         [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3404         [SOCKET_FAILURE_SIGNAL] = "signal",
3405         [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3406         [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3407         [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3408         [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3409 };
3410
3411 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3412
3413 const UnitVTable socket_vtable = {
3414         .object_size = sizeof(Socket),
3415         .exec_context_offset = offsetof(Socket, exec_context),
3416         .cgroup_context_offset = offsetof(Socket, cgroup_context),
3417         .kill_context_offset = offsetof(Socket, kill_context),
3418         .exec_runtime_offset = offsetof(Socket, exec_runtime),
3419         .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3420
3421         .sections =
3422                 "Unit\0"
3423                 "Socket\0"
3424                 "Install\0",
3425         .private_section = "Socket",
3426
3427         .can_transient = true,
3428         .can_trigger = true,
3429         .can_fail = true,
3430
3431         .init = socket_init,
3432         .done = socket_done,
3433         .load = socket_load,
3434
3435         .coldplug = socket_coldplug,
3436
3437         .dump = socket_dump,
3438
3439         .start = socket_start,
3440         .stop = socket_stop,
3441
3442         .kill = socket_kill,
3443         .clean = socket_clean,
3444         .can_clean = socket_can_clean,
3445
3446         .get_timeout = socket_get_timeout,
3447
3448         .serialize = socket_serialize,
3449         .deserialize_item = socket_deserialize_item,
3450         .distribute_fds = socket_distribute_fds,
3451
3452         .active_state = socket_active_state,
3453         .sub_state_to_string = socket_sub_state_to_string,
3454
3455         .will_restart = unit_will_restart_default,
3456
3457         .may_gc = socket_may_gc,
3458
3459         .sigchld_event = socket_sigchld_event,
3460
3461         .trigger_notify = socket_trigger_notify,
3462
3463         .reset_failed = socket_reset_failed,
3464
3465         .control_pid = socket_control_pid,
3466
3467         .bus_set_property = bus_socket_set_property,
3468         .bus_commit_properties = bus_socket_commit_properties,
3469
3470         .status_message_formats = {
3471                 /*.starting_stopping = {
3472                         [0] = "Starting socket %s...",
3473                         [1] = "Stopping socket %s...",
3474                 },*/
3475                 .finished_start_job = {
3476                         [JOB_DONE]       = "Listening on %s.",
3477                         [JOB_FAILED]     = "Failed to listen on %s.",
3478                         [JOB_TIMEOUT]    = "Timed out starting %s.",
3479                 },
3480                 .finished_stop_job = {
3481                         [JOB_DONE]       = "Closed %s.",
3482                         [JOB_FAILED]     = "Failed stopping %s.",
3483                         [JOB_TIMEOUT]    = "Timed out stopping %s.",
3484                 },
3485         },
3486 };