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Merge pull request #10976 from yuwata/typesafe-netlink-call
[thirdparty/systemd.git] / 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 <signal.h>
9 #include <sys/epoll.h>
10 #include <sys/stat.h>
11 #include <unistd.h>
12 #include <linux/sctp.h>
13
14 #include "alloc-util.h"
15 #include "bpf-firewall.h"
16 #include "bus-error.h"
17 #include "bus-util.h"
18 #include "copy.h"
19 #include "dbus-socket.h"
20 #include "def.h"
21 #include "exit-status.h"
22 #include "fd-util.h"
23 #include "format-util.h"
24 #include "fs-util.h"
25 #include "in-addr-util.h"
26 #include "io-util.h"
27 #include "ip-protocol-list.h"
28 #include "label.h"
29 #include "log.h"
30 #include "missing.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 "special.h"
41 #include "string-table.h"
42 #include "string-util.h"
43 #include "strv.h"
44 #include "unit-name.h"
45 #include "unit.h"
46 #include "user-util.h"
47
48 struct SocketPeer {
49 unsigned n_ref;
50
51 Socket *socket;
52 union sockaddr_union peer;
53 socklen_t peer_salen;
54 };
55
56 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
57 [SOCKET_DEAD] = UNIT_INACTIVE,
58 [SOCKET_START_PRE] = UNIT_ACTIVATING,
59 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
60 [SOCKET_START_POST] = UNIT_ACTIVATING,
61 [SOCKET_LISTENING] = UNIT_ACTIVE,
62 [SOCKET_RUNNING] = UNIT_ACTIVE,
63 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
64 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
65 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
67 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
68 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
69 [SOCKET_FAILED] = UNIT_FAILED
70 };
71
72 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
73 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
74
75 static void socket_init(Unit *u) {
76 Socket *s = SOCKET(u);
77
78 assert(u);
79 assert(u->load_state == UNIT_STUB);
80
81 s->backlog = SOMAXCONN;
82 s->timeout_usec = u->manager->default_timeout_start_usec;
83 s->directory_mode = 0755;
84 s->socket_mode = 0666;
85
86 s->max_connections = 64;
87
88 s->priority = -1;
89 s->ip_tos = -1;
90 s->ip_ttl = -1;
91 s->mark = -1;
92
93 s->exec_context.std_output = u->manager->default_std_output;
94 s->exec_context.std_error = u->manager->default_std_error;
95
96 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
97
98 s->trigger_limit.interval = USEC_INFINITY;
99 s->trigger_limit.burst = (unsigned) -1;
100 }
101
102 static void socket_unwatch_control_pid(Socket *s) {
103 assert(s);
104
105 if (s->control_pid <= 0)
106 return;
107
108 unit_unwatch_pid(UNIT(s), s->control_pid);
109 s->control_pid = 0;
110 }
111
112 static void socket_cleanup_fd_list(SocketPort *p) {
113 assert(p);
114
115 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
116 p->auxiliary_fds = mfree(p->auxiliary_fds);
117 p->n_auxiliary_fds = 0;
118 }
119
120 void socket_free_ports(Socket *s) {
121 SocketPort *p;
122
123 assert(s);
124
125 while ((p = s->ports)) {
126 LIST_REMOVE(port, s->ports, p);
127
128 sd_event_source_unref(p->event_source);
129
130 socket_cleanup_fd_list(p);
131 safe_close(p->fd);
132 free(p->path);
133 free(p);
134 }
135 }
136
137 static void socket_done(Unit *u) {
138 Socket *s = SOCKET(u);
139 SocketPeer *p;
140
141 assert(s);
142
143 socket_free_ports(s);
144
145 while ((p = set_steal_first(s->peers_by_address)))
146 p->socket = NULL;
147
148 s->peers_by_address = set_free(s->peers_by_address);
149
150 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
151 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
152 s->control_command = NULL;
153
154 dynamic_creds_unref(&s->dynamic_creds);
155
156 socket_unwatch_control_pid(s);
157
158 unit_ref_unset(&s->service);
159
160 s->tcp_congestion = mfree(s->tcp_congestion);
161 s->bind_to_device = mfree(s->bind_to_device);
162
163 s->smack = mfree(s->smack);
164 s->smack_ip_in = mfree(s->smack_ip_in);
165 s->smack_ip_out = mfree(s->smack_ip_out);
166
167 strv_free(s->symlinks);
168
169 s->user = mfree(s->user);
170 s->group = mfree(s->group);
171
172 s->fdname = mfree(s->fdname);
173
174 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
175 }
176
177 static int socket_arm_timer(Socket *s, usec_t usec) {
178 int r;
179
180 assert(s);
181
182 if (s->timer_event_source) {
183 r = sd_event_source_set_time(s->timer_event_source, usec);
184 if (r < 0)
185 return r;
186
187 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
188 }
189
190 if (usec == USEC_INFINITY)
191 return 0;
192
193 r = sd_event_add_time(
194 UNIT(s)->manager->event,
195 &s->timer_event_source,
196 CLOCK_MONOTONIC,
197 usec, 0,
198 socket_dispatch_timer, s);
199 if (r < 0)
200 return r;
201
202 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
203
204 return 0;
205 }
206
207 int socket_instantiate_service(Socket *s) {
208 _cleanup_free_ char *prefix = NULL, *name = NULL;
209 int r;
210 Unit *u;
211
212 assert(s);
213
214 /* This fills in s->service if it isn't filled in yet. For
215 * Accept=yes sockets we create the next connection service
216 * here. For Accept=no this is mostly a NOP since the service
217 * is figured out at load time anyway. */
218
219 if (UNIT_DEREF(s->service))
220 return 0;
221
222 if (!s->accept)
223 return 0;
224
225 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
226 if (r < 0)
227 return r;
228
229 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
230 return -ENOMEM;
231
232 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
233 if (r < 0)
234 return r;
235
236 unit_ref_set(&s->service, UNIT(s), u);
237
238 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
239 }
240
241 static bool have_non_accept_socket(Socket *s) {
242 SocketPort *p;
243
244 assert(s);
245
246 if (!s->accept)
247 return true;
248
249 LIST_FOREACH(port, p, s->ports) {
250
251 if (p->type != SOCKET_SOCKET)
252 return true;
253
254 if (!socket_address_can_accept(&p->address))
255 return true;
256 }
257
258 return false;
259 }
260
261 static int socket_add_mount_dependencies(Socket *s) {
262 SocketPort *p;
263 int r;
264
265 assert(s);
266
267 LIST_FOREACH(port, p, s->ports) {
268 const char *path = NULL;
269
270 if (p->type == SOCKET_SOCKET)
271 path = socket_address_get_path(&p->address);
272 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
273 path = p->path;
274
275 if (!path)
276 continue;
277
278 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
279 if (r < 0)
280 return r;
281 }
282
283 return 0;
284 }
285
286 static int socket_add_device_dependencies(Socket *s) {
287 char *t;
288
289 assert(s);
290
291 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
292 return 0;
293
294 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
295 return unit_add_node_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
296 }
297
298 static int socket_add_default_dependencies(Socket *s) {
299 int r;
300 assert(s);
301
302 if (!UNIT(s)->default_dependencies)
303 return 0;
304
305 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
306 if (r < 0)
307 return r;
308
309 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
310 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
311 if (r < 0)
312 return r;
313 }
314
315 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
316 }
317
318 _pure_ static bool socket_has_exec(Socket *s) {
319 unsigned i;
320 assert(s);
321
322 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
323 if (s->exec_command[i])
324 return true;
325
326 return false;
327 }
328
329 static int socket_add_extras(Socket *s) {
330 Unit *u = UNIT(s);
331 int r;
332
333 assert(s);
334
335 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
336 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
337 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
338 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
339 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
340 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
341 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
342 * service starts are typical. */
343
344 if (s->trigger_limit.interval == USEC_INFINITY)
345 s->trigger_limit.interval = 2 * USEC_PER_SEC;
346
347 if (s->trigger_limit.burst == (unsigned) -1) {
348 if (s->accept)
349 s->trigger_limit.burst = 200;
350 else
351 s->trigger_limit.burst = 20;
352 }
353
354 if (have_non_accept_socket(s)) {
355
356 if (!UNIT_DEREF(s->service)) {
357 Unit *x;
358
359 r = unit_load_related_unit(u, ".service", &x);
360 if (r < 0)
361 return r;
362
363 unit_ref_set(&s->service, u, x);
364 }
365
366 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
367 if (r < 0)
368 return r;
369 }
370
371 r = socket_add_mount_dependencies(s);
372 if (r < 0)
373 return r;
374
375 r = socket_add_device_dependencies(s);
376 if (r < 0)
377 return r;
378
379 r = unit_patch_contexts(u);
380 if (r < 0)
381 return r;
382
383 if (socket_has_exec(s)) {
384 r = unit_add_exec_dependencies(u, &s->exec_context);
385 if (r < 0)
386 return r;
387 }
388
389 r = unit_set_default_slice(u);
390 if (r < 0)
391 return r;
392
393 r = socket_add_default_dependencies(s);
394 if (r < 0)
395 return r;
396
397 return 0;
398 }
399
400 static const char *socket_find_symlink_target(Socket *s) {
401 const char *found = NULL;
402 SocketPort *p;
403
404 LIST_FOREACH(port, p, s->ports) {
405 const char *f = NULL;
406
407 switch (p->type) {
408
409 case SOCKET_FIFO:
410 f = p->path;
411 break;
412
413 case SOCKET_SOCKET:
414 f = socket_address_get_path(&p->address);
415 break;
416
417 default:
418 break;
419 }
420
421 if (f) {
422 if (found)
423 return NULL;
424
425 found = f;
426 }
427 }
428
429 return found;
430 }
431
432 static int socket_verify(Socket *s) {
433 assert(s);
434
435 if (UNIT(s)->load_state != UNIT_LOADED)
436 return 0;
437
438 if (!s->ports) {
439 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
440 return -ENOEXEC;
441 }
442
443 if (s->accept && have_non_accept_socket(s)) {
444 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
445 return -ENOEXEC;
446 }
447
448 if (s->accept && s->max_connections <= 0) {
449 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
450 return -ENOEXEC;
451 }
452
453 if (s->accept && UNIT_DEREF(s->service)) {
454 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
455 return -ENOEXEC;
456 }
457
458 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
459 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
460 return -ENOEXEC;
461 }
462
463 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
464 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
465 return -ENOEXEC;
466 }
467
468 return 0;
469 }
470
471 static void peer_address_hash_func(const void *p, struct siphash *state) {
472 const SocketPeer *s = p;
473
474 assert(s);
475
476 if (s->peer.sa.sa_family == AF_INET)
477 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
478 else if (s->peer.sa.sa_family == AF_INET6)
479 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
480 else if (s->peer.sa.sa_family == AF_VSOCK)
481 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
482 else
483 assert_not_reached("Unknown address family.");
484 }
485
486 static int peer_address_compare_func(const void *a, const void *b) {
487 const SocketPeer *x = a, *y = b;
488 int r;
489
490 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
491 if (r != 0)
492 return r;
493
494 switch(x->peer.sa.sa_family) {
495 case AF_INET:
496 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
497 case AF_INET6:
498 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
499 case AF_VSOCK:
500 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
501 }
502 assert_not_reached("Black sheep in the family!");
503 }
504
505 const struct hash_ops peer_address_hash_ops = {
506 .hash = peer_address_hash_func,
507 .compare = peer_address_compare_func
508 };
509
510 static int socket_load(Unit *u) {
511 Socket *s = SOCKET(u);
512 int r;
513
514 assert(u);
515 assert(u->load_state == UNIT_STUB);
516
517 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
518 if (r < 0)
519 return r;
520
521 r = unit_load_fragment_and_dropin(u);
522 if (r < 0)
523 return r;
524
525 if (u->load_state == UNIT_LOADED) {
526 /* This is a new unit? Then let's add in some extras */
527 r = socket_add_extras(s);
528 if (r < 0)
529 return r;
530 }
531
532 return socket_verify(s);
533 }
534
535 static SocketPeer *socket_peer_new(void) {
536 SocketPeer *p;
537
538 p = new0(SocketPeer, 1);
539 if (!p)
540 return NULL;
541
542 p->n_ref = 1;
543
544 return p;
545 }
546
547 static SocketPeer *socket_peer_free(SocketPeer *p) {
548 assert(p);
549
550 if (p->socket)
551 set_remove(p->socket->peers_by_address, p);
552
553 return mfree(p);
554 }
555
556 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
557
558 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
559 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
560 SocketPeer sa = {}, *i;
561 socklen_t salen = sizeof(sa.peer);
562 int r;
563
564 assert(fd >= 0);
565 assert(s);
566
567 r = getpeername(fd, &sa.peer.sa, &salen);
568 if (r < 0)
569 return log_error_errno(errno, "getpeername failed: %m");
570
571 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
572 *p = NULL;
573 return 0;
574 }
575
576 i = set_get(s->peers_by_address, &sa);
577 if (i) {
578 *p = socket_peer_ref(i);
579 return 1;
580 }
581
582 remote = socket_peer_new();
583 if (!remote)
584 return log_oom();
585
586 remote->peer = sa.peer;
587 remote->peer_salen = salen;
588
589 r = set_put(s->peers_by_address, remote);
590 if (r < 0)
591 return r;
592
593 remote->socket = s;
594
595 *p = TAKE_PTR(remote);
596
597 return 1;
598 }
599
600 _const_ static const char* listen_lookup(int family, int type) {
601
602 if (family == AF_NETLINK)
603 return "ListenNetlink";
604
605 if (type == SOCK_STREAM)
606 return "ListenStream";
607 else if (type == SOCK_DGRAM)
608 return "ListenDatagram";
609 else if (type == SOCK_SEQPACKET)
610 return "ListenSequentialPacket";
611
612 assert_not_reached("Unknown socket type");
613 return NULL;
614 }
615
616 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
617 char time_string[FORMAT_TIMESPAN_MAX];
618 SocketExecCommand c;
619 Socket *s = SOCKET(u);
620 SocketPort *p;
621 const char *prefix2, *str;
622
623 assert(s);
624 assert(f);
625
626 prefix = strempty(prefix);
627 prefix2 = strjoina(prefix, "\t");
628
629 fprintf(f,
630 "%sSocket State: %s\n"
631 "%sResult: %s\n"
632 "%sBindIPv6Only: %s\n"
633 "%sBacklog: %u\n"
634 "%sSocketMode: %04o\n"
635 "%sDirectoryMode: %04o\n"
636 "%sKeepAlive: %s\n"
637 "%sNoDelay: %s\n"
638 "%sFreeBind: %s\n"
639 "%sTransparent: %s\n"
640 "%sBroadcast: %s\n"
641 "%sPassCredentials: %s\n"
642 "%sPassSecurity: %s\n"
643 "%sTCPCongestion: %s\n"
644 "%sRemoveOnStop: %s\n"
645 "%sWritable: %s\n"
646 "%sFileDescriptorName: %s\n"
647 "%sSELinuxContextFromNet: %s\n",
648 prefix, socket_state_to_string(s->state),
649 prefix, socket_result_to_string(s->result),
650 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
651 prefix, s->backlog,
652 prefix, s->socket_mode,
653 prefix, s->directory_mode,
654 prefix, yes_no(s->keep_alive),
655 prefix, yes_no(s->no_delay),
656 prefix, yes_no(s->free_bind),
657 prefix, yes_no(s->transparent),
658 prefix, yes_no(s->broadcast),
659 prefix, yes_no(s->pass_cred),
660 prefix, yes_no(s->pass_sec),
661 prefix, strna(s->tcp_congestion),
662 prefix, yes_no(s->remove_on_stop),
663 prefix, yes_no(s->writable),
664 prefix, socket_fdname(s),
665 prefix, yes_no(s->selinux_context_from_net));
666
667 if (s->control_pid > 0)
668 fprintf(f,
669 "%sControl PID: "PID_FMT"\n",
670 prefix, s->control_pid);
671
672 if (s->bind_to_device)
673 fprintf(f,
674 "%sBindToDevice: %s\n",
675 prefix, s->bind_to_device);
676
677 if (s->accept)
678 fprintf(f,
679 "%sAccepted: %u\n"
680 "%sNConnections: %u\n"
681 "%sMaxConnections: %u\n"
682 "%sMaxConnectionsPerSource: %u\n",
683 prefix, s->n_accepted,
684 prefix, s->n_connections,
685 prefix, s->max_connections,
686 prefix, s->max_connections_per_source);
687
688 if (s->priority >= 0)
689 fprintf(f,
690 "%sPriority: %i\n",
691 prefix, s->priority);
692
693 if (s->receive_buffer > 0)
694 fprintf(f,
695 "%sReceiveBuffer: %zu\n",
696 prefix, s->receive_buffer);
697
698 if (s->send_buffer > 0)
699 fprintf(f,
700 "%sSendBuffer: %zu\n",
701 prefix, s->send_buffer);
702
703 if (s->ip_tos >= 0)
704 fprintf(f,
705 "%sIPTOS: %i\n",
706 prefix, s->ip_tos);
707
708 if (s->ip_ttl >= 0)
709 fprintf(f,
710 "%sIPTTL: %i\n",
711 prefix, s->ip_ttl);
712
713 if (s->pipe_size > 0)
714 fprintf(f,
715 "%sPipeSize: %zu\n",
716 prefix, s->pipe_size);
717
718 if (s->mark >= 0)
719 fprintf(f,
720 "%sMark: %i\n",
721 prefix, s->mark);
722
723 if (s->mq_maxmsg > 0)
724 fprintf(f,
725 "%sMessageQueueMaxMessages: %li\n",
726 prefix, s->mq_maxmsg);
727
728 if (s->mq_msgsize > 0)
729 fprintf(f,
730 "%sMessageQueueMessageSize: %li\n",
731 prefix, s->mq_msgsize);
732
733 if (s->reuse_port)
734 fprintf(f,
735 "%sReusePort: %s\n",
736 prefix, yes_no(s->reuse_port));
737
738 if (s->smack)
739 fprintf(f,
740 "%sSmackLabel: %s\n",
741 prefix, s->smack);
742
743 if (s->smack_ip_in)
744 fprintf(f,
745 "%sSmackLabelIPIn: %s\n",
746 prefix, s->smack_ip_in);
747
748 if (s->smack_ip_out)
749 fprintf(f,
750 "%sSmackLabelIPOut: %s\n",
751 prefix, s->smack_ip_out);
752
753 if (!isempty(s->user) || !isempty(s->group))
754 fprintf(f,
755 "%sSocketUser: %s\n"
756 "%sSocketGroup: %s\n",
757 prefix, strna(s->user),
758 prefix, strna(s->group));
759
760 if (s->keep_alive_time > 0)
761 fprintf(f,
762 "%sKeepAliveTimeSec: %s\n",
763 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
764
765 if (s->keep_alive_interval > 0)
766 fprintf(f,
767 "%sKeepAliveIntervalSec: %s\n",
768 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
769
770 if (s->keep_alive_cnt > 0)
771 fprintf(f,
772 "%sKeepAliveProbes: %u\n",
773 prefix, s->keep_alive_cnt);
774
775 if (s->defer_accept > 0)
776 fprintf(f,
777 "%sDeferAcceptSec: %s\n",
778 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
779
780 LIST_FOREACH(port, p, s->ports) {
781
782 switch (p->type) {
783 case SOCKET_SOCKET: {
784 _cleanup_free_ char *k = NULL;
785 const char *t;
786 int r;
787
788 r = socket_address_print(&p->address, &k);
789 if (r < 0)
790 t = strerror(-r);
791 else
792 t = k;
793
794 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
795 break;
796 }
797 case SOCKET_SPECIAL:
798 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
799 break;
800 case SOCKET_USB_FUNCTION:
801 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
802 break;
803 case SOCKET_MQUEUE:
804 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
805 break;
806 default:
807 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
808 }
809 }
810
811 fprintf(f,
812 "%sTriggerLimitIntervalSec: %s\n"
813 "%sTriggerLimitBurst: %u\n",
814 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
815 prefix, s->trigger_limit.burst);
816
817 str = ip_protocol_to_name(s->socket_protocol);
818 if (str)
819 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
820
821 if (!strv_isempty(s->symlinks)) {
822 char **q;
823
824 fprintf(f, "%sSymlinks:", prefix);
825 STRV_FOREACH(q, s->symlinks)
826 fprintf(f, " %s", *q);
827
828 fprintf(f, "\n");
829 }
830
831 fprintf(f,
832 "%sTimeoutSec: %s\n",
833 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
834
835 exec_context_dump(&s->exec_context, f, prefix);
836 kill_context_dump(&s->kill_context, f, prefix);
837
838 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
839 if (!s->exec_command[c])
840 continue;
841
842 fprintf(f, "%s-> %s:\n",
843 prefix, socket_exec_command_to_string(c));
844
845 exec_command_dump_list(s->exec_command[c], f, prefix2);
846 }
847
848 cgroup_context_dump(&s->cgroup_context, f, prefix);
849 }
850
851 static int instance_from_socket(int fd, unsigned nr, char **instance) {
852 socklen_t l;
853 char *r;
854 union sockaddr_union local, remote;
855
856 assert(fd >= 0);
857 assert(instance);
858
859 l = sizeof(local);
860 if (getsockname(fd, &local.sa, &l) < 0)
861 return -errno;
862
863 l = sizeof(remote);
864 if (getpeername(fd, &remote.sa, &l) < 0)
865 return -errno;
866
867 switch (local.sa.sa_family) {
868
869 case AF_INET: {
870 uint32_t
871 a = be32toh(local.in.sin_addr.s_addr),
872 b = be32toh(remote.in.sin_addr.s_addr);
873
874 if (asprintf(&r,
875 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
876 nr,
877 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
878 be16toh(local.in.sin_port),
879 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
880 be16toh(remote.in.sin_port)) < 0)
881 return -ENOMEM;
882
883 break;
884 }
885
886 case AF_INET6: {
887 static const unsigned char ipv4_prefix[] = {
888 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
889 };
890
891 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
892 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
893 const uint8_t
894 *a = local.in6.sin6_addr.s6_addr+12,
895 *b = remote.in6.sin6_addr.s6_addr+12;
896
897 if (asprintf(&r,
898 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
899 nr,
900 a[0], a[1], a[2], a[3],
901 be16toh(local.in6.sin6_port),
902 b[0], b[1], b[2], b[3],
903 be16toh(remote.in6.sin6_port)) < 0)
904 return -ENOMEM;
905 } else {
906 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
907
908 if (asprintf(&r,
909 "%u-%s:%u-%s:%u",
910 nr,
911 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
912 be16toh(local.in6.sin6_port),
913 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
914 be16toh(remote.in6.sin6_port)) < 0)
915 return -ENOMEM;
916 }
917
918 break;
919 }
920
921 case AF_UNIX: {
922 struct ucred ucred;
923 int k;
924
925 k = getpeercred(fd, &ucred);
926 if (k >= 0) {
927 if (asprintf(&r,
928 "%u-"PID_FMT"-"UID_FMT,
929 nr, ucred.pid, ucred.uid) < 0)
930 return -ENOMEM;
931 } else if (k == -ENODATA) {
932 /* This handles the case where somebody is
933 * connecting from another pid/uid namespace
934 * (e.g. from outside of our container). */
935 if (asprintf(&r,
936 "%u-unknown",
937 nr) < 0)
938 return -ENOMEM;
939 } else
940 return k;
941
942 break;
943 }
944
945 case AF_VSOCK:
946 if (asprintf(&r,
947 "%u-%u:%u-%u:%u",
948 nr,
949 local.vm.svm_cid, local.vm.svm_port,
950 remote.vm.svm_cid, remote.vm.svm_port) < 0)
951 return -ENOMEM;
952
953 break;
954
955 default:
956 assert_not_reached("Unhandled socket type.");
957 }
958
959 *instance = r;
960 return 0;
961 }
962
963 static void socket_close_fds(Socket *s) {
964 SocketPort *p;
965 char **i;
966
967 assert(s);
968
969 LIST_FOREACH(port, p, s->ports) {
970 bool was_open;
971
972 was_open = p->fd >= 0;
973
974 p->event_source = sd_event_source_unref(p->event_source);
975 p->fd = safe_close(p->fd);
976 socket_cleanup_fd_list(p);
977
978 /* One little note: we should normally not delete any sockets in the file system here! After all some
979 * other process we spawned might still have a reference of this fd and wants to continue to use
980 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
981 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
982 * anyway, but only then. */
983
984 if (!was_open || !s->remove_on_stop)
985 continue;
986
987 switch (p->type) {
988
989 case SOCKET_FIFO:
990 (void) unlink(p->path);
991 break;
992
993 case SOCKET_MQUEUE:
994 (void) mq_unlink(p->path);
995 break;
996
997 case SOCKET_SOCKET:
998 (void) socket_address_unlink(&p->address);
999 break;
1000
1001 default:
1002 break;
1003 }
1004 }
1005
1006 if (s->remove_on_stop)
1007 STRV_FOREACH(i, s->symlinks)
1008 (void) unlink(*i);
1009 }
1010
1011 static void socket_apply_socket_options(Socket *s, int fd) {
1012 int r;
1013
1014 assert(s);
1015 assert(fd >= 0);
1016
1017 if (s->keep_alive) {
1018 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
1019 if (r < 0)
1020 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
1021 }
1022
1023 if (s->keep_alive_time > 0) {
1024 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
1025 if (r < 0)
1026 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
1027 }
1028
1029 if (s->keep_alive_interval > 0) {
1030 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
1031 if (r < 0)
1032 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
1033 }
1034
1035 if (s->keep_alive_cnt > 0) {
1036 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1037 if (r < 0)
1038 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1039 }
1040
1041 if (s->defer_accept > 0) {
1042 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1043 if (r < 0)
1044 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1045 }
1046
1047 if (s->no_delay) {
1048 if (s->socket_protocol == IPPROTO_SCTP) {
1049 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1050 if (r < 0)
1051 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1052 } else {
1053 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1054 if (r < 0)
1055 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1056 }
1057 }
1058
1059 if (s->broadcast) {
1060 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1061 if (r < 0)
1062 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1063 }
1064
1065 if (s->pass_cred) {
1066 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1067 if (r < 0)
1068 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1069 }
1070
1071 if (s->pass_sec) {
1072 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1073 if (r < 0)
1074 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1075 }
1076
1077 if (s->priority >= 0) {
1078 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1079 if (r < 0)
1080 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1081 }
1082
1083 if (s->receive_buffer > 0) {
1084 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1085 if (setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, s->receive_buffer) < 0) {
1086 r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, s->receive_buffer);
1087 if (r < 0)
1088 log_unit_warning_errno(UNIT(s), r, "SO_RCVBUF failed: %m");
1089 }
1090 }
1091
1092 if (s->send_buffer > 0) {
1093 if (setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, s->send_buffer) < 0) {
1094 r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, s->send_buffer);
1095 if (r < 0)
1096 log_unit_warning_errno(UNIT(s), r, "SO_SNDBUF failed: %m");
1097 }
1098 }
1099
1100 if (s->mark >= 0) {
1101 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1102 if (r < 0)
1103 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1104 }
1105
1106 if (s->ip_tos >= 0) {
1107 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1108 if (r < 0)
1109 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1110 }
1111
1112 if (s->ip_ttl >= 0) {
1113 int x;
1114
1115 r = setsockopt_int(fd, IPPROTO_IP, IP_TTL, s->ip_ttl);
1116
1117 if (socket_ipv6_is_supported())
1118 x = setsockopt_int(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, s->ip_ttl);
1119 else
1120 x = -EAFNOSUPPORT;
1121
1122 if (r < 0 && x < 0)
1123 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1124 }
1125
1126 if (s->tcp_congestion)
1127 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1128 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1129
1130 if (s->smack_ip_in) {
1131 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1132 if (r < 0)
1133 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1134 }
1135
1136 if (s->smack_ip_out) {
1137 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1138 if (r < 0)
1139 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1140 }
1141 }
1142
1143 static void socket_apply_fifo_options(Socket *s, int fd) {
1144 int r;
1145
1146 assert(s);
1147 assert(fd >= 0);
1148
1149 if (s->pipe_size > 0)
1150 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1151 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1152
1153 if (s->smack) {
1154 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1155 if (r < 0)
1156 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1157 }
1158 }
1159
1160 static int fifo_address_create(
1161 const char *path,
1162 mode_t directory_mode,
1163 mode_t socket_mode) {
1164
1165 _cleanup_close_ int fd = -1;
1166 mode_t old_mask;
1167 struct stat st;
1168 int r;
1169
1170 assert(path);
1171
1172 (void) mkdir_parents_label(path, directory_mode);
1173
1174 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1175 if (r < 0)
1176 return r;
1177
1178 /* Enforce the right access mode for the fifo */
1179 old_mask = umask(~socket_mode);
1180
1181 /* Include the original umask in our mask */
1182 (void) umask(~socket_mode | old_mask);
1183
1184 r = mkfifo(path, socket_mode);
1185 (void) umask(old_mask);
1186
1187 if (r < 0 && errno != EEXIST) {
1188 r = -errno;
1189 goto fail;
1190 }
1191
1192 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1193 if (fd < 0) {
1194 r = -errno;
1195 goto fail;
1196 }
1197
1198 mac_selinux_create_file_clear();
1199
1200 if (fstat(fd, &st) < 0) {
1201 r = -errno;
1202 goto fail;
1203 }
1204
1205 if (!S_ISFIFO(st.st_mode) ||
1206 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1207 st.st_uid != getuid() ||
1208 st.st_gid != getgid()) {
1209 r = -EEXIST;
1210 goto fail;
1211 }
1212
1213 return TAKE_FD(fd);
1214
1215 fail:
1216 mac_selinux_create_file_clear();
1217 return r;
1218 }
1219
1220 static int special_address_create(const char *path, bool writable) {
1221 _cleanup_close_ int fd = -1;
1222 struct stat st;
1223
1224 assert(path);
1225
1226 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1227 if (fd < 0)
1228 return -errno;
1229
1230 if (fstat(fd, &st) < 0)
1231 return -errno;
1232
1233 /* Check whether this is a /proc, /sys or /dev file or char device */
1234 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1235 return -EEXIST;
1236
1237 return TAKE_FD(fd);
1238 }
1239
1240 static int usbffs_address_create(const char *path) {
1241 _cleanup_close_ int fd = -1;
1242 struct stat st;
1243
1244 assert(path);
1245
1246 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1247 if (fd < 0)
1248 return -errno;
1249
1250 if (fstat(fd, &st) < 0)
1251 return -errno;
1252
1253 /* Check whether this is a regular file (ffs endpoint) */
1254 if (!S_ISREG(st.st_mode))
1255 return -EEXIST;
1256
1257 return TAKE_FD(fd);
1258 }
1259
1260 static int mq_address_create(
1261 const char *path,
1262 mode_t mq_mode,
1263 long maxmsg,
1264 long msgsize) {
1265
1266 _cleanup_close_ int fd = -1;
1267 struct stat st;
1268 mode_t old_mask;
1269 struct mq_attr _attr, *attr = NULL;
1270
1271 assert(path);
1272
1273 if (maxmsg > 0 && msgsize > 0) {
1274 _attr = (struct mq_attr) {
1275 .mq_flags = O_NONBLOCK,
1276 .mq_maxmsg = maxmsg,
1277 .mq_msgsize = msgsize,
1278 };
1279 attr = &_attr;
1280 }
1281
1282 /* Enforce the right access mode for the mq */
1283 old_mask = umask(~mq_mode);
1284
1285 /* Include the original umask in our mask */
1286 (void) umask(~mq_mode | old_mask);
1287 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1288 (void) umask(old_mask);
1289
1290 if (fd < 0)
1291 return -errno;
1292
1293 if (fstat(fd, &st) < 0)
1294 return -errno;
1295
1296 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1297 st.st_uid != getuid() ||
1298 st.st_gid != getgid())
1299 return -EEXIST;
1300
1301 return TAKE_FD(fd);
1302 }
1303
1304 static int socket_symlink(Socket *s) {
1305 const char *p;
1306 char **i;
1307 int r;
1308
1309 assert(s);
1310
1311 p = socket_find_symlink_target(s);
1312 if (!p)
1313 return 0;
1314
1315 STRV_FOREACH(i, s->symlinks) {
1316 (void) mkdir_parents_label(*i, s->directory_mode);
1317
1318 r = symlink_idempotent(p, *i, false);
1319
1320 if (r == -EEXIST && s->remove_on_stop) {
1321 /* If there's already something where we want to create the symlink, and the destructive
1322 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1323 * again. */
1324
1325 if (unlink(*i) >= 0)
1326 r = symlink_idempotent(p, *i, false);
1327 }
1328
1329 if (r < 0)
1330 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1331 }
1332
1333 return 0;
1334 }
1335
1336 static int usbffs_write_descs(int fd, Service *s) {
1337 int r;
1338
1339 if (!s->usb_function_descriptors || !s->usb_function_strings)
1340 return -EINVAL;
1341
1342 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1343 if (r < 0)
1344 return r;
1345
1346 return copy_file_fd(s->usb_function_strings, fd, 0);
1347 }
1348
1349 static int usbffs_select_ep(const struct dirent *d) {
1350 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1351 }
1352
1353 static int usbffs_dispatch_eps(SocketPort *p) {
1354 _cleanup_free_ struct dirent **ent = NULL;
1355 size_t n, k, i;
1356 int r;
1357
1358 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1359 if (r < 0)
1360 return -errno;
1361
1362 n = (size_t) r;
1363 p->auxiliary_fds = new(int, n);
1364 if (!p->auxiliary_fds) {
1365 r = -ENOMEM;
1366 goto clear;
1367 }
1368
1369 p->n_auxiliary_fds = n;
1370
1371 k = 0;
1372 for (i = 0; i < n; ++i) {
1373 _cleanup_free_ char *ep = NULL;
1374
1375 ep = path_make_absolute(ent[i]->d_name, p->path);
1376 if (!ep) {
1377 r = -ENOMEM;
1378 goto fail;
1379 }
1380
1381 path_simplify(ep, false);
1382
1383 r = usbffs_address_create(ep);
1384 if (r < 0)
1385 goto fail;
1386
1387 p->auxiliary_fds[k++] = r;
1388 }
1389
1390 r = 0;
1391 goto clear;
1392
1393 fail:
1394 close_many(p->auxiliary_fds, k);
1395 p->auxiliary_fds = mfree(p->auxiliary_fds);
1396 p->n_auxiliary_fds = 0;
1397
1398 clear:
1399 for (i = 0; i < n; ++i)
1400 free(ent[i]);
1401
1402 return r;
1403 }
1404
1405 static int socket_determine_selinux_label(Socket *s, char **ret) {
1406 Service *service;
1407 ExecCommand *c;
1408 _cleanup_free_ char *path = NULL;
1409 int r;
1410
1411 assert(s);
1412 assert(ret);
1413
1414 if (s->selinux_context_from_net) {
1415 /* If this is requested, get label from the network label */
1416
1417 r = mac_selinux_get_our_label(ret);
1418 if (r == -EOPNOTSUPP)
1419 goto no_label;
1420
1421 } else {
1422 /* Otherwise, get it from the executable we are about to start */
1423 r = socket_instantiate_service(s);
1424 if (r < 0)
1425 return r;
1426
1427 if (!UNIT_ISSET(s->service))
1428 goto no_label;
1429
1430 service = SERVICE(UNIT_DEREF(s->service));
1431 c = service->exec_command[SERVICE_EXEC_START];
1432 if (!c)
1433 goto no_label;
1434
1435 r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
1436 if (r < 0)
1437 goto no_label;
1438
1439 r = mac_selinux_get_create_label_from_exe(path, ret);
1440 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1441 goto no_label;
1442 }
1443
1444 return r;
1445
1446 no_label:
1447 *ret = NULL;
1448 return 0;
1449 }
1450
1451 static int socket_address_listen_do(
1452 Socket *s,
1453 const SocketAddress *address,
1454 const char *label) {
1455
1456 assert(s);
1457 assert(address);
1458
1459 return socket_address_listen(
1460 address,
1461 SOCK_CLOEXEC|SOCK_NONBLOCK,
1462 s->backlog,
1463 s->bind_ipv6_only,
1464 s->bind_to_device,
1465 s->reuse_port,
1466 s->free_bind,
1467 s->transparent,
1468 s->directory_mode,
1469 s->socket_mode,
1470 label);
1471 }
1472
1473 static int socket_address_listen_in_cgroup(
1474 Socket *s,
1475 const SocketAddress *address,
1476 const char *label) {
1477
1478 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1479 int fd, r;
1480 pid_t pid;
1481
1482 assert(s);
1483 assert(address);
1484
1485 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1486 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1487 * unit's cgroup for the purpose of BPF filtering and such. */
1488
1489 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1490 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1491
1492 r = bpf_firewall_supported();
1493 if (r < 0)
1494 return r;
1495 if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1496 goto shortcut;
1497
1498 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1499 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1500
1501 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1502 if (r < 0)
1503 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1504 if (r == 0) {
1505 /* Child */
1506
1507 pair[0] = safe_close(pair[0]);
1508
1509 fd = socket_address_listen_do(s, address, label);
1510 if (fd < 0) {
1511 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1512 _exit(EXIT_FAILURE);
1513 }
1514
1515 r = send_one_fd(pair[1], fd, 0);
1516 if (r < 0) {
1517 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1518 _exit(EXIT_FAILURE);
1519 }
1520
1521 _exit(EXIT_SUCCESS);
1522 }
1523
1524 pair[1] = safe_close(pair[1]);
1525 fd = receive_one_fd(pair[0], 0);
1526
1527 /* We synchronously wait for the helper, as it shouldn't be slow */
1528 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1529 if (r < 0) {
1530 safe_close(fd);
1531 return r;
1532 }
1533
1534 if (fd < 0)
1535 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1536
1537 return fd;
1538
1539 shortcut:
1540 fd = socket_address_listen_do(s, address, label);
1541 if (fd < 0)
1542 return log_error_errno(fd, "Failed to create listening socket: %m");
1543
1544 return fd;
1545 }
1546
1547 static int socket_open_fds(Socket *s) {
1548 _cleanup_(mac_selinux_freep) char *label = NULL;
1549 bool know_label = false;
1550 SocketPort *p;
1551 int r;
1552
1553 assert(s);
1554
1555 LIST_FOREACH(port, p, s->ports) {
1556
1557 if (p->fd >= 0)
1558 continue;
1559
1560 switch (p->type) {
1561
1562 case SOCKET_SOCKET:
1563
1564 if (!know_label) {
1565 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1566 * we need this and remember it for the rest. */
1567
1568 r = socket_determine_selinux_label(s, &label);
1569 if (r < 0)
1570 goto rollback;
1571
1572 know_label = true;
1573 }
1574
1575 /* Apply the socket protocol */
1576 switch (p->address.type) {
1577
1578 case SOCK_STREAM:
1579 case SOCK_SEQPACKET:
1580 if (s->socket_protocol == IPPROTO_SCTP)
1581 p->address.protocol = s->socket_protocol;
1582 break;
1583
1584 case SOCK_DGRAM:
1585 if (s->socket_protocol == IPPROTO_UDPLITE)
1586 p->address.protocol = s->socket_protocol;
1587 break;
1588 }
1589
1590 r = socket_address_listen_in_cgroup(s, &p->address, label);
1591 if (r < 0)
1592 goto rollback;
1593
1594 p->fd = r;
1595 socket_apply_socket_options(s, p->fd);
1596 socket_symlink(s);
1597 break;
1598
1599 case SOCKET_SPECIAL:
1600
1601 p->fd = special_address_create(p->path, s->writable);
1602 if (p->fd < 0) {
1603 r = p->fd;
1604 goto rollback;
1605 }
1606 break;
1607
1608 case SOCKET_FIFO:
1609
1610 p->fd = fifo_address_create(
1611 p->path,
1612 s->directory_mode,
1613 s->socket_mode);
1614 if (p->fd < 0) {
1615 r = p->fd;
1616 goto rollback;
1617 }
1618
1619 socket_apply_fifo_options(s, p->fd);
1620 socket_symlink(s);
1621 break;
1622
1623 case SOCKET_MQUEUE:
1624
1625 p->fd = mq_address_create(
1626 p->path,
1627 s->socket_mode,
1628 s->mq_maxmsg,
1629 s->mq_msgsize);
1630 if (p->fd < 0) {
1631 r = p->fd;
1632 goto rollback;
1633 }
1634 break;
1635
1636 case SOCKET_USB_FUNCTION: {
1637 _cleanup_free_ char *ep = NULL;
1638
1639 ep = path_make_absolute("ep0", p->path);
1640
1641 p->fd = usbffs_address_create(ep);
1642 if (p->fd < 0) {
1643 r = p->fd;
1644 goto rollback;
1645 }
1646
1647 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1648 if (r < 0)
1649 goto rollback;
1650
1651 r = usbffs_dispatch_eps(p);
1652 if (r < 0)
1653 goto rollback;
1654
1655 break;
1656 }
1657 default:
1658 assert_not_reached("Unknown port type");
1659 }
1660 }
1661
1662 return 0;
1663
1664 rollback:
1665 socket_close_fds(s);
1666 return r;
1667 }
1668
1669 static void socket_unwatch_fds(Socket *s) {
1670 SocketPort *p;
1671 int r;
1672
1673 assert(s);
1674
1675 LIST_FOREACH(port, p, s->ports) {
1676 if (p->fd < 0)
1677 continue;
1678
1679 if (!p->event_source)
1680 continue;
1681
1682 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1683 if (r < 0)
1684 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1685 }
1686 }
1687
1688 static int socket_watch_fds(Socket *s) {
1689 SocketPort *p;
1690 int r;
1691
1692 assert(s);
1693
1694 LIST_FOREACH(port, p, s->ports) {
1695 if (p->fd < 0)
1696 continue;
1697
1698 if (p->event_source) {
1699 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1700 if (r < 0)
1701 goto fail;
1702 } else {
1703 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1704 if (r < 0)
1705 goto fail;
1706
1707 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1708 }
1709 }
1710
1711 return 0;
1712
1713 fail:
1714 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1715 socket_unwatch_fds(s);
1716 return r;
1717 }
1718
1719 enum {
1720 SOCKET_OPEN_NONE,
1721 SOCKET_OPEN_SOME,
1722 SOCKET_OPEN_ALL,
1723 };
1724
1725 static int socket_check_open(Socket *s) {
1726 bool have_open = false, have_closed = false;
1727 SocketPort *p;
1728
1729 assert(s);
1730
1731 LIST_FOREACH(port, p, s->ports) {
1732 if (p->fd < 0)
1733 have_closed = true;
1734 else
1735 have_open = true;
1736
1737 if (have_open && have_closed)
1738 return SOCKET_OPEN_SOME;
1739 }
1740
1741 if (have_open)
1742 return SOCKET_OPEN_ALL;
1743
1744 return SOCKET_OPEN_NONE;
1745 }
1746
1747 static void socket_set_state(Socket *s, SocketState state) {
1748 SocketState old_state;
1749 assert(s);
1750
1751 old_state = s->state;
1752 s->state = state;
1753
1754 if (!IN_SET(state,
1755 SOCKET_START_PRE,
1756 SOCKET_START_CHOWN,
1757 SOCKET_START_POST,
1758 SOCKET_STOP_PRE,
1759 SOCKET_STOP_PRE_SIGTERM,
1760 SOCKET_STOP_PRE_SIGKILL,
1761 SOCKET_STOP_POST,
1762 SOCKET_FINAL_SIGTERM,
1763 SOCKET_FINAL_SIGKILL)) {
1764
1765 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1766 socket_unwatch_control_pid(s);
1767 s->control_command = NULL;
1768 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1769 }
1770
1771 if (state != SOCKET_LISTENING)
1772 socket_unwatch_fds(s);
1773
1774 if (!IN_SET(state,
1775 SOCKET_START_CHOWN,
1776 SOCKET_START_POST,
1777 SOCKET_LISTENING,
1778 SOCKET_RUNNING,
1779 SOCKET_STOP_PRE,
1780 SOCKET_STOP_PRE_SIGTERM,
1781 SOCKET_STOP_PRE_SIGKILL))
1782 socket_close_fds(s);
1783
1784 if (state != old_state)
1785 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1786
1787 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1788 }
1789
1790 static int socket_coldplug(Unit *u) {
1791 Socket *s = SOCKET(u);
1792 int r;
1793
1794 assert(s);
1795 assert(s->state == SOCKET_DEAD);
1796
1797 if (s->deserialized_state == s->state)
1798 return 0;
1799
1800 if (s->control_pid > 0 &&
1801 pid_is_unwaited(s->control_pid) &&
1802 IN_SET(s->deserialized_state,
1803 SOCKET_START_PRE,
1804 SOCKET_START_CHOWN,
1805 SOCKET_START_POST,
1806 SOCKET_STOP_PRE,
1807 SOCKET_STOP_PRE_SIGTERM,
1808 SOCKET_STOP_PRE_SIGKILL,
1809 SOCKET_STOP_POST,
1810 SOCKET_FINAL_SIGTERM,
1811 SOCKET_FINAL_SIGKILL)) {
1812
1813 r = unit_watch_pid(UNIT(s), s->control_pid);
1814 if (r < 0)
1815 return r;
1816
1817 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1818 if (r < 0)
1819 return r;
1820 }
1821
1822 if (IN_SET(s->deserialized_state,
1823 SOCKET_START_CHOWN,
1824 SOCKET_START_POST,
1825 SOCKET_LISTENING,
1826 SOCKET_RUNNING)) {
1827
1828 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1829 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1830 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1831 * and if there's a mismatch, warn loudly. */
1832
1833 r = socket_check_open(s);
1834 if (r == SOCKET_OPEN_NONE)
1835 log_unit_warning(UNIT(s),
1836 "Socket unit configuration has changed while unit has been running, "
1837 "no open socket file descriptor left. "
1838 "The socket unit is not functional until restarted.");
1839 else if (r == SOCKET_OPEN_SOME)
1840 log_unit_warning(UNIT(s),
1841 "Socket unit configuration has changed while unit has been running, "
1842 "and some socket file descriptors have not been opened yet. "
1843 "The socket unit is not fully functional until restarted.");
1844 }
1845
1846 if (s->deserialized_state == SOCKET_LISTENING) {
1847 r = socket_watch_fds(s);
1848 if (r < 0)
1849 return r;
1850 }
1851
1852 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
1853 (void) unit_setup_dynamic_creds(u);
1854 (void) unit_setup_exec_runtime(u);
1855 }
1856
1857 socket_set_state(s, s->deserialized_state);
1858 return 0;
1859 }
1860
1861 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1862
1863 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1864 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1865 .stdin_fd = -1,
1866 .stdout_fd = -1,
1867 .stderr_fd = -1,
1868 .exec_fd = -1,
1869 };
1870 pid_t pid;
1871 int r;
1872
1873 assert(s);
1874 assert(c);
1875 assert(_pid);
1876
1877 r = unit_prepare_exec(UNIT(s));
1878 if (r < 0)
1879 return r;
1880
1881 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1882 if (r < 0)
1883 return r;
1884
1885 r = unit_set_exec_params(UNIT(s), &exec_params);
1886 if (r < 0)
1887 return r;
1888
1889 r = exec_spawn(UNIT(s),
1890 c,
1891 &s->exec_context,
1892 &exec_params,
1893 s->exec_runtime,
1894 &s->dynamic_creds,
1895 &pid);
1896 if (r < 0)
1897 return r;
1898
1899 r = unit_watch_pid(UNIT(s), pid);
1900 if (r < 0)
1901 /* FIXME: we need to do something here */
1902 return r;
1903
1904 *_pid = pid;
1905
1906 return 0;
1907 }
1908
1909 static int socket_chown(Socket *s, pid_t *_pid) {
1910 pid_t pid;
1911 int r;
1912
1913 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1914 if (r < 0)
1915 goto fail;
1916
1917 /* We have to resolve the user names out-of-process, hence
1918 * let's fork here. It's messy, but well, what can we do? */
1919
1920 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1921 if (r < 0)
1922 return r;
1923 if (r == 0) {
1924 uid_t uid = UID_INVALID;
1925 gid_t gid = GID_INVALID;
1926 SocketPort *p;
1927
1928 /* Child */
1929
1930 if (!isempty(s->user)) {
1931 const char *user = s->user;
1932
1933 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1934 if (r < 0) {
1935 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1936 _exit(EXIT_USER);
1937 }
1938 }
1939
1940 if (!isempty(s->group)) {
1941 const char *group = s->group;
1942
1943 r = get_group_creds(&group, &gid, 0);
1944 if (r < 0) {
1945 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1946 _exit(EXIT_GROUP);
1947 }
1948 }
1949
1950 LIST_FOREACH(port, p, s->ports) {
1951 const char *path = NULL;
1952
1953 if (p->type == SOCKET_SOCKET)
1954 path = socket_address_get_path(&p->address);
1955 else if (p->type == SOCKET_FIFO)
1956 path = p->path;
1957
1958 if (!path)
1959 continue;
1960
1961 if (chown(path, uid, gid) < 0) {
1962 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1963 _exit(EXIT_CHOWN);
1964 }
1965 }
1966
1967 _exit(EXIT_SUCCESS);
1968 }
1969
1970 r = unit_watch_pid(UNIT(s), pid);
1971 if (r < 0)
1972 goto fail;
1973
1974 *_pid = pid;
1975 return 0;
1976
1977 fail:
1978 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1979 return r;
1980 }
1981
1982 static void socket_enter_dead(Socket *s, SocketResult f) {
1983 assert(s);
1984
1985 if (s->result == SOCKET_SUCCESS)
1986 s->result = f;
1987
1988 if (s->result == SOCKET_SUCCESS)
1989 unit_log_success(UNIT(s));
1990 else
1991 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
1992
1993 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1994
1995 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1996
1997 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1998
1999 unit_unref_uid_gid(UNIT(s), true);
2000
2001 dynamic_creds_destroy(&s->dynamic_creds);
2002 }
2003
2004 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2005
2006 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2007 int r;
2008 assert(s);
2009
2010 if (s->result == SOCKET_SUCCESS)
2011 s->result = f;
2012
2013 socket_unwatch_control_pid(s);
2014 s->control_command_id = SOCKET_EXEC_STOP_POST;
2015 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2016
2017 if (s->control_command) {
2018 r = socket_spawn(s, s->control_command, &s->control_pid);
2019 if (r < 0)
2020 goto fail;
2021
2022 socket_set_state(s, SOCKET_STOP_POST);
2023 } else
2024 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2025
2026 return;
2027
2028 fail:
2029 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2030 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2031 }
2032
2033 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2034 int r;
2035
2036 assert(s);
2037
2038 if (s->result == SOCKET_SUCCESS)
2039 s->result = f;
2040
2041 r = unit_kill_context(
2042 UNIT(s),
2043 &s->kill_context,
2044 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2045 KILL_KILL : KILL_TERMINATE,
2046 -1,
2047 s->control_pid,
2048 false);
2049 if (r < 0)
2050 goto fail;
2051
2052 if (r > 0) {
2053 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2054 if (r < 0)
2055 goto fail;
2056
2057 socket_set_state(s, state);
2058 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2059 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2060 else if (state == SOCKET_STOP_PRE_SIGKILL)
2061 socket_enter_stop_post(s, SOCKET_SUCCESS);
2062 else if (state == SOCKET_FINAL_SIGTERM)
2063 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2064 else
2065 socket_enter_dead(s, SOCKET_SUCCESS);
2066
2067 return;
2068
2069 fail:
2070 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2071
2072 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2073 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2074 else
2075 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2076 }
2077
2078 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2079 int r;
2080 assert(s);
2081
2082 if (s->result == SOCKET_SUCCESS)
2083 s->result = f;
2084
2085 socket_unwatch_control_pid(s);
2086 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2087 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2088
2089 if (s->control_command) {
2090 r = socket_spawn(s, s->control_command, &s->control_pid);
2091 if (r < 0)
2092 goto fail;
2093
2094 socket_set_state(s, SOCKET_STOP_PRE);
2095 } else
2096 socket_enter_stop_post(s, SOCKET_SUCCESS);
2097
2098 return;
2099
2100 fail:
2101 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2102 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2103 }
2104
2105 static void socket_enter_listening(Socket *s) {
2106 int r;
2107 assert(s);
2108
2109 r = socket_watch_fds(s);
2110 if (r < 0) {
2111 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2112 goto fail;
2113 }
2114
2115 socket_set_state(s, SOCKET_LISTENING);
2116 return;
2117
2118 fail:
2119 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2120 }
2121
2122 static void socket_enter_start_post(Socket *s) {
2123 int r;
2124 assert(s);
2125
2126 socket_unwatch_control_pid(s);
2127 s->control_command_id = SOCKET_EXEC_START_POST;
2128 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2129
2130 if (s->control_command) {
2131 r = socket_spawn(s, s->control_command, &s->control_pid);
2132 if (r < 0) {
2133 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2134 goto fail;
2135 }
2136
2137 socket_set_state(s, SOCKET_START_POST);
2138 } else
2139 socket_enter_listening(s);
2140
2141 return;
2142
2143 fail:
2144 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2145 }
2146
2147 static void socket_enter_start_chown(Socket *s) {
2148 int r;
2149
2150 assert(s);
2151
2152 r = socket_open_fds(s);
2153 if (r < 0) {
2154 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2155 goto fail;
2156 }
2157
2158 if (!isempty(s->user) || !isempty(s->group)) {
2159
2160 socket_unwatch_control_pid(s);
2161 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2162 s->control_command = NULL;
2163
2164 r = socket_chown(s, &s->control_pid);
2165 if (r < 0) {
2166 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2167 goto fail;
2168 }
2169
2170 socket_set_state(s, SOCKET_START_CHOWN);
2171 } else
2172 socket_enter_start_post(s);
2173
2174 return;
2175
2176 fail:
2177 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2178 }
2179
2180 static void socket_enter_start_pre(Socket *s) {
2181 int r;
2182 assert(s);
2183
2184 socket_unwatch_control_pid(s);
2185
2186 unit_warn_leftover_processes(UNIT(s));
2187
2188 s->control_command_id = SOCKET_EXEC_START_PRE;
2189 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2190
2191 if (s->control_command) {
2192 r = socket_spawn(s, s->control_command, &s->control_pid);
2193 if (r < 0) {
2194 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2195 goto fail;
2196 }
2197
2198 socket_set_state(s, SOCKET_START_PRE);
2199 } else
2200 socket_enter_start_chown(s);
2201
2202 return;
2203
2204 fail:
2205 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2206 }
2207
2208 static void flush_ports(Socket *s) {
2209 SocketPort *p;
2210
2211 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2212 * anymore */
2213
2214 LIST_FOREACH(port, p, s->ports) {
2215 if (p->fd < 0)
2216 continue;
2217
2218 (void) flush_accept(p->fd);
2219 (void) flush_fd(p->fd);
2220 }
2221 }
2222
2223 static void socket_enter_running(Socket *s, int cfd) {
2224 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2225 int r;
2226
2227 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2228 * close it. */
2229
2230 assert(s);
2231
2232 /* We don't take connections anymore if we are supposed to shut down anyway */
2233 if (unit_stop_pending(UNIT(s))) {
2234
2235 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2236
2237 if (cfd >= 0)
2238 goto refuse;
2239 else
2240 flush_ports(s);
2241
2242 return;
2243 }
2244
2245 if (!ratelimit_below(&s->trigger_limit)) {
2246 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2247 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2248 goto refuse;
2249 }
2250
2251 if (cfd < 0) {
2252 bool pending = false;
2253 Unit *other;
2254 Iterator i;
2255 void *v;
2256
2257 /* If there's already a start pending don't bother to
2258 * do anything */
2259 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2260 if (unit_active_or_pending(other)) {
2261 pending = true;
2262 break;
2263 }
2264
2265 if (!pending) {
2266 if (!UNIT_ISSET(s->service)) {
2267 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2268 r = -ENOENT;
2269 goto fail;
2270 }
2271
2272 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2273 if (r < 0)
2274 goto fail;
2275 }
2276
2277 socket_set_state(s, SOCKET_RUNNING);
2278 } else {
2279 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2280 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2281 Service *service;
2282
2283 if (s->n_connections >= s->max_connections) {
2284 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2285 s->n_connections);
2286 goto refuse;
2287 }
2288
2289 if (s->max_connections_per_source > 0) {
2290 r = socket_acquire_peer(s, cfd, &p);
2291 if (r < 0) {
2292 goto refuse;
2293 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2294 _cleanup_free_ char *t = NULL;
2295
2296 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2297
2298 log_unit_warning(UNIT(s),
2299 "Too many incoming connections (%u) from source %s, dropping connection.",
2300 p->n_ref, strnull(t));
2301 goto refuse;
2302 }
2303 }
2304
2305 r = socket_instantiate_service(s);
2306 if (r < 0)
2307 goto fail;
2308
2309 r = instance_from_socket(cfd, s->n_accepted, &instance);
2310 if (r < 0) {
2311 if (r != -ENOTCONN)
2312 goto fail;
2313
2314 /* ENOTCONN is legitimate if TCP RST was received.
2315 * This connection is over, but the socket unit lives on. */
2316 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2317 goto refuse;
2318 }
2319
2320 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2321 if (r < 0)
2322 goto fail;
2323
2324 r = unit_name_build(prefix, instance, ".service", &name);
2325 if (r < 0)
2326 goto fail;
2327
2328 r = unit_add_name(UNIT_DEREF(s->service), name);
2329 if (r < 0)
2330 goto fail;
2331
2332 service = SERVICE(UNIT_DEREF(s->service));
2333 unit_ref_unset(&s->service);
2334
2335 s->n_accepted++;
2336 unit_choose_id(UNIT(service), name);
2337
2338 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2339 if (r < 0)
2340 goto fail;
2341
2342 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2343 s->n_connections++;
2344
2345 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2346
2347 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2348 if (r < 0) {
2349 /* We failed to activate the new service, but it still exists. Let's make sure the service
2350 * closes and forgets the connection fd again, immediately. */
2351 service_close_socket_fd(service);
2352 goto fail;
2353 }
2354
2355 /* Notify clients about changed counters */
2356 unit_add_to_dbus_queue(UNIT(s));
2357 }
2358
2359 return;
2360
2361 refuse:
2362 s->n_refused++;
2363 safe_close(cfd);
2364 return;
2365
2366 fail:
2367 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2368 cfd >= 0 ? "template" : "non-template",
2369 bus_error_message(&error, r));
2370
2371 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2372 safe_close(cfd);
2373 }
2374
2375 static void socket_run_next(Socket *s) {
2376 int r;
2377
2378 assert(s);
2379 assert(s->control_command);
2380 assert(s->control_command->command_next);
2381
2382 socket_unwatch_control_pid(s);
2383
2384 s->control_command = s->control_command->command_next;
2385
2386 r = socket_spawn(s, s->control_command, &s->control_pid);
2387 if (r < 0)
2388 goto fail;
2389
2390 return;
2391
2392 fail:
2393 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2394
2395 if (s->state == SOCKET_START_POST)
2396 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2397 else if (s->state == SOCKET_STOP_POST)
2398 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2399 else
2400 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2401 }
2402
2403 static int socket_start(Unit *u) {
2404 Socket *s = SOCKET(u);
2405 int r;
2406
2407 assert(s);
2408
2409 /* We cannot fulfill this request right now, try again later
2410 * please! */
2411 if (IN_SET(s->state,
2412 SOCKET_STOP_PRE,
2413 SOCKET_STOP_PRE_SIGKILL,
2414 SOCKET_STOP_PRE_SIGTERM,
2415 SOCKET_STOP_POST,
2416 SOCKET_FINAL_SIGTERM,
2417 SOCKET_FINAL_SIGKILL))
2418 return -EAGAIN;
2419
2420 /* Already on it! */
2421 if (IN_SET(s->state,
2422 SOCKET_START_PRE,
2423 SOCKET_START_CHOWN,
2424 SOCKET_START_POST))
2425 return 0;
2426
2427 /* Cannot run this without the service being around */
2428 if (UNIT_ISSET(s->service)) {
2429 Service *service;
2430
2431 service = SERVICE(UNIT_DEREF(s->service));
2432
2433 if (UNIT(service)->load_state != UNIT_LOADED) {
2434 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2435 return -ENOENT;
2436 }
2437
2438 /* If the service is already active we cannot start the
2439 * socket */
2440 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2441 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2442 return -EBUSY;
2443 }
2444 }
2445
2446 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2447
2448 r = unit_start_limit_test(u);
2449 if (r < 0) {
2450 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2451 return r;
2452 }
2453
2454 r = unit_acquire_invocation_id(u);
2455 if (r < 0)
2456 return r;
2457
2458 s->result = SOCKET_SUCCESS;
2459 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2460
2461 u->reset_accounting = true;
2462
2463 socket_enter_start_pre(s);
2464 return 1;
2465 }
2466
2467 static int socket_stop(Unit *u) {
2468 Socket *s = SOCKET(u);
2469
2470 assert(s);
2471
2472 /* Already on it */
2473 if (IN_SET(s->state,
2474 SOCKET_STOP_PRE,
2475 SOCKET_STOP_PRE_SIGTERM,
2476 SOCKET_STOP_PRE_SIGKILL,
2477 SOCKET_STOP_POST,
2478 SOCKET_FINAL_SIGTERM,
2479 SOCKET_FINAL_SIGKILL))
2480 return 0;
2481
2482 /* If there's already something running we go directly into
2483 * kill mode. */
2484 if (IN_SET(s->state,
2485 SOCKET_START_PRE,
2486 SOCKET_START_CHOWN,
2487 SOCKET_START_POST)) {
2488 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2489 return -EAGAIN;
2490 }
2491
2492 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2493
2494 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2495 return 1;
2496 }
2497
2498 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2499 Socket *s = SOCKET(u);
2500 SocketPort *p;
2501 int r;
2502
2503 assert(u);
2504 assert(f);
2505 assert(fds);
2506
2507 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2508 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2509 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2510 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2511
2512 if (s->control_pid > 0)
2513 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2514
2515 if (s->control_command_id >= 0)
2516 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2517
2518 LIST_FOREACH(port, p, s->ports) {
2519 int copy;
2520
2521 if (p->fd < 0)
2522 continue;
2523
2524 copy = fdset_put_dup(fds, p->fd);
2525 if (copy < 0)
2526 return log_warning_errno(copy, "Failed to serialize socket fd: %m");
2527
2528 if (p->type == SOCKET_SOCKET) {
2529 _cleanup_free_ char *t = NULL;
2530
2531 r = socket_address_print(&p->address, &t);
2532 if (r < 0)
2533 return log_error_errno(r, "Failed to format socket address: %m");
2534
2535 if (socket_address_family(&p->address) == AF_NETLINK)
2536 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2537 else
2538 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2539 } else if (p->type == SOCKET_SPECIAL)
2540 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2541 else if (p->type == SOCKET_MQUEUE)
2542 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2543 else if (p->type == SOCKET_USB_FUNCTION)
2544 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2545 else {
2546 assert(p->type == SOCKET_FIFO);
2547 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2548 }
2549 }
2550
2551 return 0;
2552 }
2553
2554 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2555 assert(p);
2556
2557 safe_close(p->fd);
2558 p->fd = fdset_remove(fds, fd);
2559 }
2560
2561 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2562 Socket *s = SOCKET(u);
2563
2564 assert(u);
2565 assert(key);
2566 assert(value);
2567
2568 if (streq(key, "state")) {
2569 SocketState state;
2570
2571 state = socket_state_from_string(value);
2572 if (state < 0)
2573 log_unit_debug(u, "Failed to parse state value: %s", value);
2574 else
2575 s->deserialized_state = state;
2576 } else if (streq(key, "result")) {
2577 SocketResult f;
2578
2579 f = socket_result_from_string(value);
2580 if (f < 0)
2581 log_unit_debug(u, "Failed to parse result value: %s", value);
2582 else if (f != SOCKET_SUCCESS)
2583 s->result = f;
2584
2585 } else if (streq(key, "n-accepted")) {
2586 unsigned k;
2587
2588 if (safe_atou(value, &k) < 0)
2589 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2590 else
2591 s->n_accepted += k;
2592 } else if (streq(key, "n-refused")) {
2593 unsigned k;
2594
2595 if (safe_atou(value, &k) < 0)
2596 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2597 else
2598 s->n_refused += k;
2599 } else if (streq(key, "control-pid")) {
2600 pid_t pid;
2601
2602 if (parse_pid(value, &pid) < 0)
2603 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2604 else
2605 s->control_pid = pid;
2606 } else if (streq(key, "control-command")) {
2607 SocketExecCommand id;
2608
2609 id = socket_exec_command_from_string(value);
2610 if (id < 0)
2611 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2612 else {
2613 s->control_command_id = id;
2614 s->control_command = s->exec_command[id];
2615 }
2616 } else if (streq(key, "fifo")) {
2617 int fd, skip = 0;
2618 SocketPort *p;
2619
2620 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2621 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2622 else
2623 LIST_FOREACH(port, p, s->ports)
2624 if (p->type == SOCKET_FIFO &&
2625 path_equal_or_files_same(p->path, value+skip, 0)) {
2626 socket_port_take_fd(p, fds, fd);
2627 break;
2628 }
2629
2630 } else if (streq(key, "special")) {
2631 int fd, skip = 0;
2632 SocketPort *p;
2633
2634 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2635 log_unit_debug(u, "Failed to parse special value: %s", value);
2636 else
2637 LIST_FOREACH(port, p, s->ports)
2638 if (p->type == SOCKET_SPECIAL &&
2639 path_equal_or_files_same(p->path, value+skip, 0)) {
2640 socket_port_take_fd(p, fds, fd);
2641 break;
2642 }
2643
2644 } else if (streq(key, "mqueue")) {
2645 int fd, skip = 0;
2646 SocketPort *p;
2647
2648 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2649 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2650 else
2651 LIST_FOREACH(port, p, s->ports)
2652 if (p->type == SOCKET_MQUEUE &&
2653 streq(p->path, value+skip)) {
2654 socket_port_take_fd(p, fds, fd);
2655 break;
2656 }
2657
2658 } else if (streq(key, "socket")) {
2659 int fd, type, skip = 0;
2660 SocketPort *p;
2661
2662 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2663 log_unit_debug(u, "Failed to parse socket value: %s", value);
2664 else
2665 LIST_FOREACH(port, p, s->ports)
2666 if (socket_address_is(&p->address, value+skip, type)) {
2667 socket_port_take_fd(p, fds, fd);
2668 break;
2669 }
2670
2671 } else if (streq(key, "netlink")) {
2672 int fd, skip = 0;
2673 SocketPort *p;
2674
2675 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2676 log_unit_debug(u, "Failed to parse socket value: %s", value);
2677 else
2678 LIST_FOREACH(port, p, s->ports)
2679 if (socket_address_is_netlink(&p->address, value+skip)) {
2680 socket_port_take_fd(p, fds, fd);
2681 break;
2682 }
2683
2684 } else if (streq(key, "ffs")) {
2685 int fd, skip = 0;
2686 SocketPort *p;
2687
2688 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2689 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2690 else
2691 LIST_FOREACH(port, p, s->ports)
2692 if (p->type == SOCKET_USB_FUNCTION &&
2693 path_equal_or_files_same(p->path, value+skip, 0)) {
2694 socket_port_take_fd(p, fds, fd);
2695 break;
2696 }
2697
2698 } else
2699 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2700
2701 return 0;
2702 }
2703
2704 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2705 Socket *s = SOCKET(u);
2706 SocketPort *p;
2707
2708 assert(u);
2709
2710 LIST_FOREACH(port, p, s->ports) {
2711 Iterator i;
2712 int fd;
2713
2714 if (p->type != SOCKET_SOCKET)
2715 continue;
2716
2717 if (p->fd >= 0)
2718 continue;
2719
2720 FDSET_FOREACH(fd, fds, i) {
2721 if (socket_address_matches_fd(&p->address, fd)) {
2722 p->fd = fdset_remove(fds, fd);
2723 s->deserialized_state = SOCKET_LISTENING;
2724 break;
2725 }
2726 }
2727 }
2728 }
2729
2730 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2731 assert(u);
2732
2733 return state_translation_table[SOCKET(u)->state];
2734 }
2735
2736 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2737 assert(u);
2738
2739 return socket_state_to_string(SOCKET(u)->state);
2740 }
2741
2742 const char* socket_port_type_to_string(SocketPort *p) {
2743
2744 assert(p);
2745
2746 switch (p->type) {
2747
2748 case SOCKET_SOCKET:
2749
2750 switch (p->address.type) {
2751
2752 case SOCK_STREAM:
2753 return "Stream";
2754
2755 case SOCK_DGRAM:
2756 return "Datagram";
2757
2758 case SOCK_SEQPACKET:
2759 return "SequentialPacket";
2760
2761 case SOCK_RAW:
2762 if (socket_address_family(&p->address) == AF_NETLINK)
2763 return "Netlink";
2764
2765 _fallthrough_;
2766 default:
2767 return NULL;
2768 }
2769
2770 case SOCKET_SPECIAL:
2771 return "Special";
2772
2773 case SOCKET_MQUEUE:
2774 return "MessageQueue";
2775
2776 case SOCKET_FIFO:
2777 return "FIFO";
2778
2779 case SOCKET_USB_FUNCTION:
2780 return "USBFunction";
2781
2782 default:
2783 return NULL;
2784 }
2785 }
2786
2787 SocketType socket_port_type_from_string(const char *s) {
2788 assert(s);
2789
2790 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2791 return SOCKET_SOCKET;
2792 else if (streq(s, "Special"))
2793 return SOCKET_SPECIAL;
2794 else if (streq(s, "MessageQueue"))
2795 return SOCKET_MQUEUE;
2796 else if (streq(s, "FIFO"))
2797 return SOCKET_FIFO;
2798 else if (streq(s, "USBFunction"))
2799 return SOCKET_USB_FUNCTION;
2800 else
2801 return _SOCKET_TYPE_INVALID;
2802 }
2803
2804 _pure_ static bool socket_may_gc(Unit *u) {
2805 Socket *s = SOCKET(u);
2806
2807 assert(u);
2808
2809 return s->n_connections == 0;
2810 }
2811
2812 static int socket_accept_do(Socket *s, int fd) {
2813 int cfd;
2814
2815 assert(s);
2816 assert(fd >= 0);
2817
2818 for (;;) {
2819 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2820 if (cfd < 0) {
2821 if (errno == EINTR)
2822 continue;
2823
2824 return -errno;
2825 }
2826
2827 break;
2828 }
2829
2830 return cfd;
2831 }
2832
2833 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2834 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2835 int cfd, r;
2836 pid_t pid;
2837
2838 assert(s);
2839 assert(p);
2840 assert(fd >= 0);
2841
2842 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2843 * connection socket is also properly associated with the cgroup. */
2844
2845 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2846 goto shortcut;
2847
2848 r = bpf_firewall_supported();
2849 if (r < 0)
2850 return r;
2851 if (r == BPF_FIREWALL_UNSUPPORTED)
2852 goto shortcut;
2853
2854 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2855 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2856
2857 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2858 if (r < 0)
2859 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2860 if (r == 0) {
2861 /* Child */
2862
2863 pair[0] = safe_close(pair[0]);
2864
2865 cfd = socket_accept_do(s, fd);
2866 if (cfd < 0) {
2867 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2868 _exit(EXIT_FAILURE);
2869 }
2870
2871 r = send_one_fd(pair[1], cfd, 0);
2872 if (r < 0) {
2873 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2874 _exit(EXIT_FAILURE);
2875 }
2876
2877 _exit(EXIT_SUCCESS);
2878 }
2879
2880 pair[1] = safe_close(pair[1]);
2881 cfd = receive_one_fd(pair[0], 0);
2882
2883 /* We synchronously wait for the helper, as it shouldn't be slow */
2884 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2885 if (r < 0) {
2886 safe_close(cfd);
2887 return r;
2888 }
2889
2890 if (cfd < 0)
2891 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2892
2893 return cfd;
2894
2895 shortcut:
2896 cfd = socket_accept_do(s, fd);
2897 if (cfd < 0)
2898 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2899
2900 return cfd;
2901 }
2902
2903 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2904 SocketPort *p = userdata;
2905 int cfd = -1;
2906
2907 assert(p);
2908 assert(fd >= 0);
2909
2910 if (p->socket->state != SOCKET_LISTENING)
2911 return 0;
2912
2913 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2914
2915 if (revents != EPOLLIN) {
2916
2917 if (revents & EPOLLHUP)
2918 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.");
2919 else
2920 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2921 goto fail;
2922 }
2923
2924 if (p->socket->accept &&
2925 p->type == SOCKET_SOCKET &&
2926 socket_address_can_accept(&p->address)) {
2927
2928 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2929 if (cfd < 0)
2930 goto fail;
2931
2932 socket_apply_socket_options(p->socket, cfd);
2933 }
2934
2935 socket_enter_running(p->socket, cfd);
2936 return 0;
2937
2938 fail:
2939 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2940 return 0;
2941 }
2942
2943 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2944 Socket *s = SOCKET(u);
2945 SocketResult f;
2946
2947 assert(s);
2948 assert(pid >= 0);
2949
2950 if (pid != s->control_pid)
2951 return;
2952
2953 s->control_pid = 0;
2954
2955 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2956 f = SOCKET_SUCCESS;
2957 else if (code == CLD_EXITED)
2958 f = SOCKET_FAILURE_EXIT_CODE;
2959 else if (code == CLD_KILLED)
2960 f = SOCKET_FAILURE_SIGNAL;
2961 else if (code == CLD_DUMPED)
2962 f = SOCKET_FAILURE_CORE_DUMP;
2963 else
2964 assert_not_reached("Unknown sigchld code");
2965
2966 if (s->control_command) {
2967 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2968
2969 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2970 f = SOCKET_SUCCESS;
2971 }
2972
2973 unit_log_process_exit(
2974 u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
2975 "Control process",
2976 socket_exec_command_to_string(s->control_command_id),
2977 code, status);
2978
2979 if (s->result == SOCKET_SUCCESS)
2980 s->result = f;
2981
2982 if (s->control_command &&
2983 s->control_command->command_next &&
2984 f == SOCKET_SUCCESS) {
2985
2986 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2987 socket_run_next(s);
2988 } else {
2989 s->control_command = NULL;
2990 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2991
2992 /* No further commands for this step, so let's figure
2993 * out what to do next */
2994
2995 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2996
2997 switch (s->state) {
2998
2999 case SOCKET_START_PRE:
3000 if (f == SOCKET_SUCCESS)
3001 socket_enter_start_chown(s);
3002 else
3003 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3004 break;
3005
3006 case SOCKET_START_CHOWN:
3007 if (f == SOCKET_SUCCESS)
3008 socket_enter_start_post(s);
3009 else
3010 socket_enter_stop_pre(s, f);
3011 break;
3012
3013 case SOCKET_START_POST:
3014 if (f == SOCKET_SUCCESS)
3015 socket_enter_listening(s);
3016 else
3017 socket_enter_stop_pre(s, f);
3018 break;
3019
3020 case SOCKET_STOP_PRE:
3021 case SOCKET_STOP_PRE_SIGTERM:
3022 case SOCKET_STOP_PRE_SIGKILL:
3023 socket_enter_stop_post(s, f);
3024 break;
3025
3026 case SOCKET_STOP_POST:
3027 case SOCKET_FINAL_SIGTERM:
3028 case SOCKET_FINAL_SIGKILL:
3029 socket_enter_dead(s, f);
3030 break;
3031
3032 default:
3033 assert_not_reached("Uh, control process died at wrong time.");
3034 }
3035 }
3036
3037 /* Notify clients about changed exit status */
3038 unit_add_to_dbus_queue(u);
3039 }
3040
3041 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3042 Socket *s = SOCKET(userdata);
3043
3044 assert(s);
3045 assert(s->timer_event_source == source);
3046
3047 switch (s->state) {
3048
3049 case SOCKET_START_PRE:
3050 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3051 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3052 break;
3053
3054 case SOCKET_START_CHOWN:
3055 case SOCKET_START_POST:
3056 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3057 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3058 break;
3059
3060 case SOCKET_STOP_PRE:
3061 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3062 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3063 break;
3064
3065 case SOCKET_STOP_PRE_SIGTERM:
3066 if (s->kill_context.send_sigkill) {
3067 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3068 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3069 } else {
3070 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3071 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3072 }
3073 break;
3074
3075 case SOCKET_STOP_PRE_SIGKILL:
3076 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3077 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3078 break;
3079
3080 case SOCKET_STOP_POST:
3081 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3082 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3083 break;
3084
3085 case SOCKET_FINAL_SIGTERM:
3086 if (s->kill_context.send_sigkill) {
3087 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3088 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3089 } else {
3090 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3091 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3092 }
3093 break;
3094
3095 case SOCKET_FINAL_SIGKILL:
3096 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3097 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3098 break;
3099
3100 default:
3101 assert_not_reached("Timeout at wrong time.");
3102 }
3103
3104 return 0;
3105 }
3106
3107 int socket_collect_fds(Socket *s, int **fds) {
3108 size_t k = 0, n = 0;
3109 SocketPort *p;
3110 int *rfds;
3111
3112 assert(s);
3113 assert(fds);
3114
3115 /* Called from the service code for requesting our fds */
3116
3117 LIST_FOREACH(port, p, s->ports) {
3118 if (p->fd >= 0)
3119 n++;
3120 n += p->n_auxiliary_fds;
3121 }
3122
3123 if (n <= 0) {
3124 *fds = NULL;
3125 return 0;
3126 }
3127
3128 rfds = new(int, n);
3129 if (!rfds)
3130 return -ENOMEM;
3131
3132 LIST_FOREACH(port, p, s->ports) {
3133 size_t i;
3134
3135 if (p->fd >= 0)
3136 rfds[k++] = p->fd;
3137 for (i = 0; i < p->n_auxiliary_fds; ++i)
3138 rfds[k++] = p->auxiliary_fds[i];
3139 }
3140
3141 assert(k == n);
3142
3143 *fds = rfds;
3144 return (int) n;
3145 }
3146
3147 static void socket_reset_failed(Unit *u) {
3148 Socket *s = SOCKET(u);
3149
3150 assert(s);
3151
3152 if (s->state == SOCKET_FAILED)
3153 socket_set_state(s, SOCKET_DEAD);
3154
3155 s->result = SOCKET_SUCCESS;
3156 }
3157
3158 void socket_connection_unref(Socket *s) {
3159 assert(s);
3160
3161 /* The service is dead. Yay!
3162 *
3163 * This is strictly for one-instance-per-connection
3164 * services. */
3165
3166 assert(s->n_connections > 0);
3167 s->n_connections--;
3168
3169 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3170 }
3171
3172 static void socket_trigger_notify(Unit *u, Unit *other) {
3173 Socket *s = SOCKET(u);
3174
3175 assert(u);
3176 assert(other);
3177
3178 /* Filter out invocations with bogus state */
3179 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3180 return;
3181
3182 /* Don't propagate state changes from the service if we are already down */
3183 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3184 return;
3185
3186 /* We don't care for the service state if we are in Accept=yes mode */
3187 if (s->accept)
3188 return;
3189
3190 /* Propagate start limit hit state */
3191 if (other->start_limit_hit) {
3192 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3193 return;
3194 }
3195
3196 /* Don't propagate anything if there's still a job queued */
3197 if (other->job)
3198 return;
3199
3200 if (IN_SET(SERVICE(other)->state,
3201 SERVICE_DEAD, SERVICE_FAILED,
3202 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3203 SERVICE_AUTO_RESTART))
3204 socket_enter_listening(s);
3205
3206 if (SERVICE(other)->state == SERVICE_RUNNING)
3207 socket_set_state(s, SOCKET_RUNNING);
3208 }
3209
3210 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3211 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3212 }
3213
3214 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3215 Socket *s = SOCKET(u);
3216 usec_t t;
3217 int r;
3218
3219 if (!s->timer_event_source)
3220 return 0;
3221
3222 r = sd_event_source_get_time(s->timer_event_source, &t);
3223 if (r < 0)
3224 return r;
3225 if (t == USEC_INFINITY)
3226 return 0;
3227
3228 *timeout = t;
3229 return 1;
3230 }
3231
3232 char *socket_fdname(Socket *s) {
3233 assert(s);
3234
3235 /* Returns the name to use for $LISTEN_NAMES. If the user
3236 * didn't specify anything specifically, use the socket unit's
3237 * name as fallback. */
3238
3239 return s->fdname ?: UNIT(s)->id;
3240 }
3241
3242 static int socket_control_pid(Unit *u) {
3243 Socket *s = SOCKET(u);
3244
3245 assert(s);
3246
3247 return s->control_pid;
3248 }
3249
3250 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3251 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3252 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3253 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3254 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3255 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3256 };
3257
3258 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3259
3260 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3261 [SOCKET_SUCCESS] = "success",
3262 [SOCKET_FAILURE_RESOURCES] = "resources",
3263 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3264 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3265 [SOCKET_FAILURE_SIGNAL] = "signal",
3266 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3267 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3268 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3269 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3270 };
3271
3272 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3273
3274 const UnitVTable socket_vtable = {
3275 .object_size = sizeof(Socket),
3276 .exec_context_offset = offsetof(Socket, exec_context),
3277 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3278 .kill_context_offset = offsetof(Socket, kill_context),
3279 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3280 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3281
3282 .sections =
3283 "Unit\0"
3284 "Socket\0"
3285 "Install\0",
3286 .private_section = "Socket",
3287
3288 .can_transient = true,
3289
3290 .init = socket_init,
3291 .done = socket_done,
3292 .load = socket_load,
3293
3294 .coldplug = socket_coldplug,
3295
3296 .dump = socket_dump,
3297
3298 .start = socket_start,
3299 .stop = socket_stop,
3300
3301 .kill = socket_kill,
3302
3303 .get_timeout = socket_get_timeout,
3304
3305 .serialize = socket_serialize,
3306 .deserialize_item = socket_deserialize_item,
3307 .distribute_fds = socket_distribute_fds,
3308
3309 .active_state = socket_active_state,
3310 .sub_state_to_string = socket_sub_state_to_string,
3311
3312 .may_gc = socket_may_gc,
3313
3314 .sigchld_event = socket_sigchld_event,
3315
3316 .trigger_notify = socket_trigger_notify,
3317
3318 .reset_failed = socket_reset_failed,
3319
3320 .control_pid = socket_control_pid,
3321
3322 .bus_vtable = bus_socket_vtable,
3323 .bus_set_property = bus_socket_set_property,
3324 .bus_commit_properties = bus_socket_commit_properties,
3325
3326 .status_message_formats = {
3327 /*.starting_stopping = {
3328 [0] = "Starting socket %s...",
3329 [1] = "Stopping socket %s...",
3330 },*/
3331 .finished_start_job = {
3332 [JOB_DONE] = "Listening on %s.",
3333 [JOB_FAILED] = "Failed to listen on %s.",
3334 [JOB_TIMEOUT] = "Timed out starting %s.",
3335 },
3336 .finished_stop_job = {
3337 [JOB_DONE] = "Closed %s.",
3338 [JOB_FAILED] = "Failed stopping %s.",
3339 [JOB_TIMEOUT] = "Timed out stopping %s.",
3340 },
3341 },
3342 };
Unnamed repository; edit this file 'description' to name the repository.