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[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2010 Lennart Poettering
6 ***/
7
8 #include <arpa/inet.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <mqueue.h>
12 #include <netinet/tcp.h>
13 #include <signal.h>
14 #include <sys/epoll.h>
15 #include <sys/stat.h>
16 #include <unistd.h>
17 #include <linux/sctp.h>
18
19 #include "alloc-util.h"
20 #include "bpf-firewall.h"
21 #include "bus-error.h"
22 #include "bus-util.h"
23 #include "copy.h"
24 #include "dbus-socket.h"
25 #include "def.h"
26 #include "exit-status.h"
27 #include "fd-util.h"
28 #include "format-util.h"
29 #include "fs-util.h"
30 #include "in-addr-util.h"
31 #include "io-util.h"
32 #include "label.h"
33 #include "log.h"
34 #include "missing.h"
35 #include "mkdir.h"
36 #include "parse-util.h"
37 #include "path-util.h"
38 #include "process-util.h"
39 #include "selinux-util.h"
40 #include "signal-util.h"
41 #include "smack-util.h"
42 #include "socket.h"
43 #include "socket-protocol-list.h"
44 #include "special.h"
45 #include "string-table.h"
46 #include "string-util.h"
47 #include "strv.h"
48 #include "unit-name.h"
49 #include "unit.h"
50 #include "user-util.h"
51
52 struct SocketPeer {
53 unsigned n_ref;
54
55 Socket *socket;
56 union sockaddr_union peer;
57 socklen_t peer_salen;
58 };
59
60 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
61 [SOCKET_DEAD] = UNIT_INACTIVE,
62 [SOCKET_START_PRE] = UNIT_ACTIVATING,
63 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
64 [SOCKET_START_POST] = UNIT_ACTIVATING,
65 [SOCKET_LISTENING] = UNIT_ACTIVE,
66 [SOCKET_RUNNING] = UNIT_ACTIVE,
67 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
69 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
70 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
71 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
72 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
73 [SOCKET_FAILED] = UNIT_FAILED
74 };
75
76 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
77 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = (unsigned) -1;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), s->control_pid);
113 s->control_pid = 0;
114 }
115
116 static void socket_cleanup_fd_list(SocketPort *p) {
117 assert(p);
118
119 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
120 p->auxiliary_fds = mfree(p->auxiliary_fds);
121 p->n_auxiliary_fds = 0;
122 }
123
124 void socket_free_ports(Socket *s) {
125 SocketPort *p;
126
127 assert(s);
128
129 while ((p = s->ports)) {
130 LIST_REMOVE(port, s->ports, p);
131
132 sd_event_source_unref(p->event_source);
133
134 socket_cleanup_fd_list(p);
135 safe_close(p->fd);
136 free(p->path);
137 free(p);
138 }
139 }
140
141 static void socket_done(Unit *u) {
142 Socket *s = SOCKET(u);
143 SocketPeer *p;
144
145 assert(s);
146
147 socket_free_ports(s);
148
149 while ((p = set_steal_first(s->peers_by_address)))
150 p->socket = NULL;
151
152 s->peers_by_address = set_free(s->peers_by_address);
153
154 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
155 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
156 s->control_command = NULL;
157
158 dynamic_creds_unref(&s->dynamic_creds);
159
160 socket_unwatch_control_pid(s);
161
162 unit_ref_unset(&s->service);
163
164 s->tcp_congestion = mfree(s->tcp_congestion);
165 s->bind_to_device = mfree(s->bind_to_device);
166
167 s->smack = mfree(s->smack);
168 s->smack_ip_in = mfree(s->smack_ip_in);
169 s->smack_ip_out = mfree(s->smack_ip_out);
170
171 strv_free(s->symlinks);
172
173 s->user = mfree(s->user);
174 s->group = mfree(s->group);
175
176 s->fdname = mfree(s->fdname);
177
178 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
179 }
180
181 static int socket_arm_timer(Socket *s, usec_t usec) {
182 int r;
183
184 assert(s);
185
186 if (s->timer_event_source) {
187 r = sd_event_source_set_time(s->timer_event_source, usec);
188 if (r < 0)
189 return r;
190
191 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
192 }
193
194 if (usec == USEC_INFINITY)
195 return 0;
196
197 r = sd_event_add_time(
198 UNIT(s)->manager->event,
199 &s->timer_event_source,
200 CLOCK_MONOTONIC,
201 usec, 0,
202 socket_dispatch_timer, s);
203 if (r < 0)
204 return r;
205
206 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
207
208 return 0;
209 }
210
211 int socket_instantiate_service(Socket *s) {
212 _cleanup_free_ char *prefix = NULL, *name = NULL;
213 int r;
214 Unit *u;
215
216 assert(s);
217
218 /* This fills in s->service if it isn't filled in yet. For
219 * Accept=yes sockets we create the next connection service
220 * here. For Accept=no this is mostly a NOP since the service
221 * is figured out at load time anyway. */
222
223 if (UNIT_DEREF(s->service))
224 return 0;
225
226 if (!s->accept)
227 return 0;
228
229 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
230 if (r < 0)
231 return r;
232
233 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
234 return -ENOMEM;
235
236 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
237 if (r < 0)
238 return r;
239
240 unit_ref_set(&s->service, UNIT(s), u);
241
242 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
243 }
244
245 static bool have_non_accept_socket(Socket *s) {
246 SocketPort *p;
247
248 assert(s);
249
250 if (!s->accept)
251 return true;
252
253 LIST_FOREACH(port, p, s->ports) {
254
255 if (p->type != SOCKET_SOCKET)
256 return true;
257
258 if (!socket_address_can_accept(&p->address))
259 return true;
260 }
261
262 return false;
263 }
264
265 static int socket_add_mount_dependencies(Socket *s) {
266 SocketPort *p;
267 int r;
268
269 assert(s);
270
271 LIST_FOREACH(port, p, s->ports) {
272 const char *path = NULL;
273
274 if (p->type == SOCKET_SOCKET)
275 path = socket_address_get_path(&p->address);
276 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
277 path = p->path;
278
279 if (!path)
280 continue;
281
282 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
283 if (r < 0)
284 return r;
285 }
286
287 return 0;
288 }
289
290 static int socket_add_device_dependencies(Socket *s) {
291 char *t;
292
293 assert(s);
294
295 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
296 return 0;
297
298 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
299 return unit_add_node_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
300 }
301
302 static int socket_add_default_dependencies(Socket *s) {
303 int r;
304 assert(s);
305
306 if (!UNIT(s)->default_dependencies)
307 return 0;
308
309 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
310 if (r < 0)
311 return r;
312
313 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
314 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
315 if (r < 0)
316 return r;
317 }
318
319 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
320 }
321
322 _pure_ static bool socket_has_exec(Socket *s) {
323 unsigned i;
324 assert(s);
325
326 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
327 if (s->exec_command[i])
328 return true;
329
330 return false;
331 }
332
333 static int socket_add_extras(Socket *s) {
334 Unit *u = UNIT(s);
335 int r;
336
337 assert(s);
338
339 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
340 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
341 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
342 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
343 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
344 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
345 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
346 * service starts are typical. */
347
348 if (s->trigger_limit.interval == USEC_INFINITY)
349 s->trigger_limit.interval = 2 * USEC_PER_SEC;
350
351 if (s->trigger_limit.burst == (unsigned) -1) {
352 if (s->accept)
353 s->trigger_limit.burst = 200;
354 else
355 s->trigger_limit.burst = 20;
356 }
357
358 if (have_non_accept_socket(s)) {
359
360 if (!UNIT_DEREF(s->service)) {
361 Unit *x;
362
363 r = unit_load_related_unit(u, ".service", &x);
364 if (r < 0)
365 return r;
366
367 unit_ref_set(&s->service, u, x);
368 }
369
370 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
371 if (r < 0)
372 return r;
373 }
374
375 r = socket_add_mount_dependencies(s);
376 if (r < 0)
377 return r;
378
379 r = socket_add_device_dependencies(s);
380 if (r < 0)
381 return r;
382
383 r = unit_patch_contexts(u);
384 if (r < 0)
385 return r;
386
387 if (socket_has_exec(s)) {
388 r = unit_add_exec_dependencies(u, &s->exec_context);
389 if (r < 0)
390 return r;
391 }
392
393 r = unit_set_default_slice(u);
394 if (r < 0)
395 return r;
396
397 r = socket_add_default_dependencies(s);
398 if (r < 0)
399 return r;
400
401 return 0;
402 }
403
404 static const char *socket_find_symlink_target(Socket *s) {
405 const char *found = NULL;
406 SocketPort *p;
407
408 LIST_FOREACH(port, p, s->ports) {
409 const char *f = NULL;
410
411 switch (p->type) {
412
413 case SOCKET_FIFO:
414 f = p->path;
415 break;
416
417 case SOCKET_SOCKET:
418 f = socket_address_get_path(&p->address);
419 break;
420
421 default:
422 break;
423 }
424
425 if (f) {
426 if (found)
427 return NULL;
428
429 found = f;
430 }
431 }
432
433 return found;
434 }
435
436 static int socket_verify(Socket *s) {
437 assert(s);
438
439 if (UNIT(s)->load_state != UNIT_LOADED)
440 return 0;
441
442 if (!s->ports) {
443 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
444 return -EINVAL;
445 }
446
447 if (s->accept && have_non_accept_socket(s)) {
448 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
449 return -EINVAL;
450 }
451
452 if (s->accept && s->max_connections <= 0) {
453 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
454 return -EINVAL;
455 }
456
457 if (s->accept && UNIT_DEREF(s->service)) {
458 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
459 return -EINVAL;
460 }
461
462 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
463 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
464 return -EINVAL;
465 }
466
467 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
468 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
469 return -EINVAL;
470 }
471
472 return 0;
473 }
474
475 static void peer_address_hash_func(const void *p, struct siphash *state) {
476 const SocketPeer *s = p;
477
478 assert(s);
479
480 if (s->peer.sa.sa_family == AF_INET)
481 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
482 else if (s->peer.sa.sa_family == AF_INET6)
483 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
484 else if (s->peer.sa.sa_family == AF_VSOCK)
485 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
486 else
487 assert_not_reached("Unknown address family.");
488 }
489
490 static int peer_address_compare_func(const void *a, const void *b) {
491 const SocketPeer *x = a, *y = b;
492
493 if (x->peer.sa.sa_family < y->peer.sa.sa_family)
494 return -1;
495 if (x->peer.sa.sa_family > y->peer.sa.sa_family)
496 return 1;
497
498 switch(x->peer.sa.sa_family) {
499 case AF_INET:
500 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
501 case AF_INET6:
502 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
503 case AF_VSOCK:
504 if (x->peer.vm.svm_cid < y->peer.vm.svm_cid)
505 return -1;
506 if (x->peer.vm.svm_cid > y->peer.vm.svm_cid)
507 return 1;
508 return 0;
509 }
510 assert_not_reached("Black sheep in the family!");
511 }
512
513 const struct hash_ops peer_address_hash_ops = {
514 .hash = peer_address_hash_func,
515 .compare = peer_address_compare_func
516 };
517
518 static int socket_load(Unit *u) {
519 Socket *s = SOCKET(u);
520 int r;
521
522 assert(u);
523 assert(u->load_state == UNIT_STUB);
524
525 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
526 if (r < 0)
527 return r;
528
529 r = unit_load_fragment_and_dropin(u);
530 if (r < 0)
531 return r;
532
533 if (u->load_state == UNIT_LOADED) {
534 /* This is a new unit? Then let's add in some extras */
535 r = socket_add_extras(s);
536 if (r < 0)
537 return r;
538 }
539
540 return socket_verify(s);
541 }
542
543 static SocketPeer *socket_peer_new(void) {
544 SocketPeer *p;
545
546 p = new0(SocketPeer, 1);
547 if (!p)
548 return NULL;
549
550 p->n_ref = 1;
551
552 return p;
553 }
554
555 SocketPeer *socket_peer_ref(SocketPeer *p) {
556 if (!p)
557 return NULL;
558
559 assert(p->n_ref > 0);
560 p->n_ref++;
561
562 return p;
563 }
564
565 SocketPeer *socket_peer_unref(SocketPeer *p) {
566 if (!p)
567 return NULL;
568
569 assert(p->n_ref > 0);
570
571 p->n_ref--;
572
573 if (p->n_ref > 0)
574 return NULL;
575
576 if (p->socket)
577 set_remove(p->socket->peers_by_address, p);
578
579 return mfree(p);
580 }
581
582 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
583 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
584 SocketPeer sa = {}, *i;
585 socklen_t salen = sizeof(sa.peer);
586 int r;
587
588 assert(fd >= 0);
589 assert(s);
590
591 r = getpeername(fd, &sa.peer.sa, &salen);
592 if (r < 0)
593 return log_error_errno(errno, "getpeername failed: %m");
594
595 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
596 *p = NULL;
597 return 0;
598 }
599
600 i = set_get(s->peers_by_address, &sa);
601 if (i) {
602 *p = socket_peer_ref(i);
603 return 1;
604 }
605
606 remote = socket_peer_new();
607 if (!remote)
608 return log_oom();
609
610 remote->peer = sa.peer;
611 remote->peer_salen = salen;
612
613 r = set_put(s->peers_by_address, remote);
614 if (r < 0)
615 return r;
616
617 remote->socket = s;
618
619 *p = TAKE_PTR(remote);
620
621 return 1;
622 }
623
624 _const_ static const char* listen_lookup(int family, int type) {
625
626 if (family == AF_NETLINK)
627 return "ListenNetlink";
628
629 if (type == SOCK_STREAM)
630 return "ListenStream";
631 else if (type == SOCK_DGRAM)
632 return "ListenDatagram";
633 else if (type == SOCK_SEQPACKET)
634 return "ListenSequentialPacket";
635
636 assert_not_reached("Unknown socket type");
637 return NULL;
638 }
639
640 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
641 char time_string[FORMAT_TIMESPAN_MAX];
642 SocketExecCommand c;
643 Socket *s = SOCKET(u);
644 SocketPort *p;
645 const char *prefix2, *str;
646
647 assert(s);
648 assert(f);
649
650 prefix = strempty(prefix);
651 prefix2 = strjoina(prefix, "\t");
652
653 fprintf(f,
654 "%sSocket State: %s\n"
655 "%sResult: %s\n"
656 "%sBindIPv6Only: %s\n"
657 "%sBacklog: %u\n"
658 "%sSocketMode: %04o\n"
659 "%sDirectoryMode: %04o\n"
660 "%sKeepAlive: %s\n"
661 "%sNoDelay: %s\n"
662 "%sFreeBind: %s\n"
663 "%sTransparent: %s\n"
664 "%sBroadcast: %s\n"
665 "%sPassCredentials: %s\n"
666 "%sPassSecurity: %s\n"
667 "%sTCPCongestion: %s\n"
668 "%sRemoveOnStop: %s\n"
669 "%sWritable: %s\n"
670 "%sFileDescriptorName: %s\n"
671 "%sSELinuxContextFromNet: %s\n",
672 prefix, socket_state_to_string(s->state),
673 prefix, socket_result_to_string(s->result),
674 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
675 prefix, s->backlog,
676 prefix, s->socket_mode,
677 prefix, s->directory_mode,
678 prefix, yes_no(s->keep_alive),
679 prefix, yes_no(s->no_delay),
680 prefix, yes_no(s->free_bind),
681 prefix, yes_no(s->transparent),
682 prefix, yes_no(s->broadcast),
683 prefix, yes_no(s->pass_cred),
684 prefix, yes_no(s->pass_sec),
685 prefix, strna(s->tcp_congestion),
686 prefix, yes_no(s->remove_on_stop),
687 prefix, yes_no(s->writable),
688 prefix, socket_fdname(s),
689 prefix, yes_no(s->selinux_context_from_net));
690
691 if (s->control_pid > 0)
692 fprintf(f,
693 "%sControl PID: "PID_FMT"\n",
694 prefix, s->control_pid);
695
696 if (s->bind_to_device)
697 fprintf(f,
698 "%sBindToDevice: %s\n",
699 prefix, s->bind_to_device);
700
701 if (s->accept)
702 fprintf(f,
703 "%sAccepted: %u\n"
704 "%sNConnections: %u\n"
705 "%sMaxConnections: %u\n"
706 "%sMaxConnectionsPerSource: %u\n",
707 prefix, s->n_accepted,
708 prefix, s->n_connections,
709 prefix, s->max_connections,
710 prefix, s->max_connections_per_source);
711
712 if (s->priority >= 0)
713 fprintf(f,
714 "%sPriority: %i\n",
715 prefix, s->priority);
716
717 if (s->receive_buffer > 0)
718 fprintf(f,
719 "%sReceiveBuffer: %zu\n",
720 prefix, s->receive_buffer);
721
722 if (s->send_buffer > 0)
723 fprintf(f,
724 "%sSendBuffer: %zu\n",
725 prefix, s->send_buffer);
726
727 if (s->ip_tos >= 0)
728 fprintf(f,
729 "%sIPTOS: %i\n",
730 prefix, s->ip_tos);
731
732 if (s->ip_ttl >= 0)
733 fprintf(f,
734 "%sIPTTL: %i\n",
735 prefix, s->ip_ttl);
736
737 if (s->pipe_size > 0)
738 fprintf(f,
739 "%sPipeSize: %zu\n",
740 prefix, s->pipe_size);
741
742 if (s->mark >= 0)
743 fprintf(f,
744 "%sMark: %i\n",
745 prefix, s->mark);
746
747 if (s->mq_maxmsg > 0)
748 fprintf(f,
749 "%sMessageQueueMaxMessages: %li\n",
750 prefix, s->mq_maxmsg);
751
752 if (s->mq_msgsize > 0)
753 fprintf(f,
754 "%sMessageQueueMessageSize: %li\n",
755 prefix, s->mq_msgsize);
756
757 if (s->reuse_port)
758 fprintf(f,
759 "%sReusePort: %s\n",
760 prefix, yes_no(s->reuse_port));
761
762 if (s->smack)
763 fprintf(f,
764 "%sSmackLabel: %s\n",
765 prefix, s->smack);
766
767 if (s->smack_ip_in)
768 fprintf(f,
769 "%sSmackLabelIPIn: %s\n",
770 prefix, s->smack_ip_in);
771
772 if (s->smack_ip_out)
773 fprintf(f,
774 "%sSmackLabelIPOut: %s\n",
775 prefix, s->smack_ip_out);
776
777 if (!isempty(s->user) || !isempty(s->group))
778 fprintf(f,
779 "%sSocketUser: %s\n"
780 "%sSocketGroup: %s\n",
781 prefix, strna(s->user),
782 prefix, strna(s->group));
783
784 if (s->keep_alive_time > 0)
785 fprintf(f,
786 "%sKeepAliveTimeSec: %s\n",
787 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
788
789 if (s->keep_alive_interval)
790 fprintf(f,
791 "%sKeepAliveIntervalSec: %s\n",
792 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
793
794 if (s->keep_alive_cnt)
795 fprintf(f,
796 "%sKeepAliveProbes: %u\n",
797 prefix, s->keep_alive_cnt);
798
799 if (s->defer_accept)
800 fprintf(f,
801 "%sDeferAcceptSec: %s\n",
802 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
803
804 LIST_FOREACH(port, p, s->ports) {
805
806 if (p->type == SOCKET_SOCKET) {
807 const char *t;
808 int r;
809 char *k = NULL;
810
811 r = socket_address_print(&p->address, &k);
812 if (r < 0)
813 t = strerror(-r);
814 else
815 t = k;
816
817 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
818 free(k);
819 } else if (p->type == SOCKET_SPECIAL)
820 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
821 else if (p->type == SOCKET_USB_FUNCTION)
822 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
823 else if (p->type == SOCKET_MQUEUE)
824 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
825 else
826 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
827 }
828
829 fprintf(f,
830 "%sTriggerLimitIntervalSec: %s\n"
831 "%sTriggerLimitBurst: %u\n",
832 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
833 prefix, s->trigger_limit.burst);
834
835 str = socket_protocol_to_name(s->socket_protocol);
836 if (str)
837 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
838
839 if (!strv_isempty(s->symlinks)) {
840 char **q;
841
842 fprintf(f, "%sSymlinks:", prefix);
843 STRV_FOREACH(q, s->symlinks)
844 fprintf(f, " %s", *q);
845
846 fprintf(f, "\n");
847 }
848
849 fprintf(f,
850 "%sTimeoutSec: %s\n",
851 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
852
853 exec_context_dump(&s->exec_context, f, prefix);
854 kill_context_dump(&s->kill_context, f, prefix);
855
856 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
857 if (!s->exec_command[c])
858 continue;
859
860 fprintf(f, "%s-> %s:\n",
861 prefix, socket_exec_command_to_string(c));
862
863 exec_command_dump_list(s->exec_command[c], f, prefix2);
864 }
865
866 cgroup_context_dump(&s->cgroup_context, f, prefix);
867 }
868
869 static int instance_from_socket(int fd, unsigned nr, char **instance) {
870 socklen_t l;
871 char *r;
872 union sockaddr_union local, remote;
873
874 assert(fd >= 0);
875 assert(instance);
876
877 l = sizeof(local);
878 if (getsockname(fd, &local.sa, &l) < 0)
879 return -errno;
880
881 l = sizeof(remote);
882 if (getpeername(fd, &remote.sa, &l) < 0)
883 return -errno;
884
885 switch (local.sa.sa_family) {
886
887 case AF_INET: {
888 uint32_t
889 a = be32toh(local.in.sin_addr.s_addr),
890 b = be32toh(remote.in.sin_addr.s_addr);
891
892 if (asprintf(&r,
893 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
894 nr,
895 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
896 be16toh(local.in.sin_port),
897 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
898 be16toh(remote.in.sin_port)) < 0)
899 return -ENOMEM;
900
901 break;
902 }
903
904 case AF_INET6: {
905 static const unsigned char ipv4_prefix[] = {
906 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
907 };
908
909 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
910 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
911 const uint8_t
912 *a = local.in6.sin6_addr.s6_addr+12,
913 *b = remote.in6.sin6_addr.s6_addr+12;
914
915 if (asprintf(&r,
916 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
917 nr,
918 a[0], a[1], a[2], a[3],
919 be16toh(local.in6.sin6_port),
920 b[0], b[1], b[2], b[3],
921 be16toh(remote.in6.sin6_port)) < 0)
922 return -ENOMEM;
923 } else {
924 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
925
926 if (asprintf(&r,
927 "%u-%s:%u-%s:%u",
928 nr,
929 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
930 be16toh(local.in6.sin6_port),
931 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
932 be16toh(remote.in6.sin6_port)) < 0)
933 return -ENOMEM;
934 }
935
936 break;
937 }
938
939 case AF_UNIX: {
940 struct ucred ucred;
941 int k;
942
943 k = getpeercred(fd, &ucred);
944 if (k >= 0) {
945 if (asprintf(&r,
946 "%u-"PID_FMT"-"UID_FMT,
947 nr, ucred.pid, ucred.uid) < 0)
948 return -ENOMEM;
949 } else if (k == -ENODATA) {
950 /* This handles the case where somebody is
951 * connecting from another pid/uid namespace
952 * (e.g. from outside of our container). */
953 if (asprintf(&r,
954 "%u-unknown",
955 nr) < 0)
956 return -ENOMEM;
957 } else
958 return k;
959
960 break;
961 }
962
963 case AF_VSOCK:
964 if (asprintf(&r,
965 "%u-%u:%u-%u:%u",
966 nr,
967 local.vm.svm_cid, local.vm.svm_port,
968 remote.vm.svm_cid, remote.vm.svm_port) < 0)
969 return -ENOMEM;
970
971 break;
972
973 default:
974 assert_not_reached("Unhandled socket type.");
975 }
976
977 *instance = r;
978 return 0;
979 }
980
981 static void socket_close_fds(Socket *s) {
982 SocketPort *p;
983 char **i;
984
985 assert(s);
986
987 LIST_FOREACH(port, p, s->ports) {
988 bool was_open;
989
990 was_open = p->fd >= 0;
991
992 p->event_source = sd_event_source_unref(p->event_source);
993 p->fd = safe_close(p->fd);
994 socket_cleanup_fd_list(p);
995
996 /* One little note: we should normally not delete any sockets in the file system here! After all some
997 * other process we spawned might still have a reference of this fd and wants to continue to use
998 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
999 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
1000 * anyway, but only then. */
1001
1002 if (!was_open || !s->remove_on_stop)
1003 continue;
1004
1005 switch (p->type) {
1006
1007 case SOCKET_FIFO:
1008 (void) unlink(p->path);
1009 break;
1010
1011 case SOCKET_MQUEUE:
1012 (void) mq_unlink(p->path);
1013 break;
1014
1015 case SOCKET_SOCKET:
1016 (void) socket_address_unlink(&p->address);
1017 break;
1018
1019 default:
1020 break;
1021 }
1022 }
1023
1024 if (s->remove_on_stop)
1025 STRV_FOREACH(i, s->symlinks)
1026 (void) unlink(*i);
1027 }
1028
1029 static void socket_apply_socket_options(Socket *s, int fd) {
1030 int r;
1031
1032 assert(s);
1033 assert(fd >= 0);
1034
1035 if (s->keep_alive) {
1036 int b = s->keep_alive;
1037 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
1038 log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
1039 }
1040
1041 if (s->keep_alive_time) {
1042 int value = s->keep_alive_time / USEC_PER_SEC;
1043 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
1044 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m");
1045 }
1046
1047 if (s->keep_alive_interval) {
1048 int value = s->keep_alive_interval / USEC_PER_SEC;
1049 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
1050 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m");
1051 }
1052
1053 if (s->keep_alive_cnt) {
1054 int value = s->keep_alive_cnt;
1055 if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
1056 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
1057 }
1058
1059 if (s->defer_accept) {
1060 int value = s->defer_accept / USEC_PER_SEC;
1061 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
1062 log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m");
1063 }
1064
1065 if (s->no_delay) {
1066 int b = s->no_delay;
1067
1068 if (s->socket_protocol == IPPROTO_SCTP) {
1069 if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &b, sizeof(b)) < 0)
1070 log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
1071 } else {
1072 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
1073 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
1074 }
1075 }
1076
1077 if (s->broadcast) {
1078 int one = 1;
1079 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
1080 log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
1081 }
1082
1083 if (s->pass_cred) {
1084 int one = 1;
1085 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
1086 log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
1087 }
1088
1089 if (s->pass_sec) {
1090 int one = 1;
1091 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
1092 log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
1093 }
1094
1095 if (s->priority >= 0)
1096 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
1097 log_unit_warning_errno(UNIT(s), errno, "SO_PRIORITY failed: %m");
1098
1099 if (s->receive_buffer > 0) {
1100 int value = (int) s->receive_buffer;
1101
1102 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1103
1104 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
1105 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
1106 log_unit_warning_errno(UNIT(s), errno, "SO_RCVBUF failed: %m");
1107 }
1108
1109 if (s->send_buffer > 0) {
1110 int value = (int) s->send_buffer;
1111 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
1112 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
1113 log_unit_warning_errno(UNIT(s), errno, "SO_SNDBUF failed: %m");
1114 }
1115
1116 if (s->mark >= 0)
1117 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
1118 log_unit_warning_errno(UNIT(s), errno, "SO_MARK failed: %m");
1119
1120 if (s->ip_tos >= 0)
1121 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
1122 log_unit_warning_errno(UNIT(s), errno, "IP_TOS failed: %m");
1123
1124 if (s->ip_ttl >= 0) {
1125 int x;
1126
1127 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
1128
1129 if (socket_ipv6_is_supported())
1130 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
1131 else {
1132 x = -1;
1133 errno = EAFNOSUPPORT;
1134 }
1135
1136 if (r < 0 && x < 0)
1137 log_unit_warning_errno(UNIT(s), errno, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1138 }
1139
1140 if (s->tcp_congestion)
1141 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1142 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1143
1144 if (s->smack_ip_in) {
1145 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1146 if (r < 0)
1147 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1148 }
1149
1150 if (s->smack_ip_out) {
1151 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1152 if (r < 0)
1153 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1154 }
1155 }
1156
1157 static void socket_apply_fifo_options(Socket *s, int fd) {
1158 int r;
1159
1160 assert(s);
1161 assert(fd >= 0);
1162
1163 if (s->pipe_size > 0)
1164 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1165 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1166
1167 if (s->smack) {
1168 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1169 if (r < 0)
1170 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1171 }
1172 }
1173
1174 static int fifo_address_create(
1175 const char *path,
1176 mode_t directory_mode,
1177 mode_t socket_mode) {
1178
1179 _cleanup_close_ int fd = -1;
1180 mode_t old_mask;
1181 struct stat st;
1182 int r;
1183
1184 assert(path);
1185
1186 (void) mkdir_parents_label(path, directory_mode);
1187
1188 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1189 if (r < 0)
1190 return r;
1191
1192 /* Enforce the right access mode for the fifo */
1193 old_mask = umask(~ socket_mode);
1194
1195 /* Include the original umask in our mask */
1196 (void) umask(~socket_mode | old_mask);
1197
1198 r = mkfifo(path, socket_mode);
1199 (void) umask(old_mask);
1200
1201 if (r < 0 && errno != EEXIST) {
1202 r = -errno;
1203 goto fail;
1204 }
1205
1206 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1207 if (fd < 0) {
1208 r = -errno;
1209 goto fail;
1210 }
1211
1212 mac_selinux_create_file_clear();
1213
1214 if (fstat(fd, &st) < 0) {
1215 r = -errno;
1216 goto fail;
1217 }
1218
1219 if (!S_ISFIFO(st.st_mode) ||
1220 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1221 st.st_uid != getuid() ||
1222 st.st_gid != getgid()) {
1223 r = -EEXIST;
1224 goto fail;
1225 }
1226
1227 return TAKE_FD(fd);
1228
1229 fail:
1230 mac_selinux_create_file_clear();
1231 return r;
1232 }
1233
1234 static int special_address_create(const char *path, bool writable) {
1235 _cleanup_close_ int fd = -1;
1236 struct stat st;
1237
1238 assert(path);
1239
1240 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1241 if (fd < 0)
1242 return -errno;
1243
1244 if (fstat(fd, &st) < 0)
1245 return -errno;
1246
1247 /* Check whether this is a /proc, /sys or /dev file or char device */
1248 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1249 return -EEXIST;
1250
1251 return TAKE_FD(fd);
1252 }
1253
1254 static int usbffs_address_create(const char *path) {
1255 _cleanup_close_ int fd = -1;
1256 struct stat st;
1257
1258 assert(path);
1259
1260 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1261 if (fd < 0)
1262 return -errno;
1263
1264 if (fstat(fd, &st) < 0)
1265 return -errno;
1266
1267 /* Check whether this is a regular file (ffs endpoint) */
1268 if (!S_ISREG(st.st_mode))
1269 return -EEXIST;
1270
1271 return TAKE_FD(fd);
1272 }
1273
1274 static int mq_address_create(
1275 const char *path,
1276 mode_t mq_mode,
1277 long maxmsg,
1278 long msgsize) {
1279
1280 _cleanup_close_ int fd = -1;
1281 struct stat st;
1282 mode_t old_mask;
1283 struct mq_attr _attr, *attr = NULL;
1284
1285 assert(path);
1286
1287 if (maxmsg > 0 && msgsize > 0) {
1288 _attr = (struct mq_attr) {
1289 .mq_flags = O_NONBLOCK,
1290 .mq_maxmsg = maxmsg,
1291 .mq_msgsize = msgsize,
1292 };
1293 attr = &_attr;
1294 }
1295
1296 /* Enforce the right access mode for the mq */
1297 old_mask = umask(~ mq_mode);
1298
1299 /* Include the original umask in our mask */
1300 (void) umask(~mq_mode | old_mask);
1301 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1302 (void) umask(old_mask);
1303
1304 if (fd < 0)
1305 return -errno;
1306
1307 if (fstat(fd, &st) < 0)
1308 return -errno;
1309
1310 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1311 st.st_uid != getuid() ||
1312 st.st_gid != getgid())
1313 return -EEXIST;
1314
1315 return TAKE_FD(fd);
1316 }
1317
1318 static int socket_symlink(Socket *s) {
1319 const char *p;
1320 char **i;
1321 int r;
1322
1323 assert(s);
1324
1325 p = socket_find_symlink_target(s);
1326 if (!p)
1327 return 0;
1328
1329 STRV_FOREACH(i, s->symlinks) {
1330 (void) mkdir_parents_label(*i, s->directory_mode);
1331
1332 r = symlink_idempotent(p, *i);
1333
1334 if (r == -EEXIST && s->remove_on_stop) {
1335 /* If there's already something where we want to create the symlink, and the destructive
1336 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1337 * again. */
1338
1339 if (unlink(*i) >= 0)
1340 r = symlink_idempotent(p, *i);
1341 }
1342
1343 if (r < 0)
1344 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1345 }
1346
1347 return 0;
1348 }
1349
1350 static int usbffs_write_descs(int fd, Service *s) {
1351 int r;
1352
1353 if (!s->usb_function_descriptors || !s->usb_function_strings)
1354 return -EINVAL;
1355
1356 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1357 if (r < 0)
1358 return r;
1359
1360 return copy_file_fd(s->usb_function_strings, fd, 0);
1361 }
1362
1363 static int usbffs_select_ep(const struct dirent *d) {
1364 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1365 }
1366
1367 static int usbffs_dispatch_eps(SocketPort *p) {
1368 _cleanup_free_ struct dirent **ent = NULL;
1369 int r, i, n, k;
1370
1371 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1372 if (r < 0)
1373 return -errno;
1374
1375 n = r;
1376 p->auxiliary_fds = new(int, n);
1377 if (!p->auxiliary_fds)
1378 return -ENOMEM;
1379
1380 p->n_auxiliary_fds = n;
1381
1382 k = 0;
1383 for (i = 0; i < n; ++i) {
1384 _cleanup_free_ char *ep = NULL;
1385
1386 ep = path_make_absolute(ent[i]->d_name, p->path);
1387 if (!ep)
1388 return -ENOMEM;
1389
1390 path_kill_slashes(ep);
1391
1392 r = usbffs_address_create(ep);
1393 if (r < 0)
1394 goto fail;
1395
1396 p->auxiliary_fds[k] = r;
1397
1398 ++k;
1399 free(ent[i]);
1400 }
1401
1402 return r;
1403
1404 fail:
1405 close_many(p->auxiliary_fds, k);
1406 p->auxiliary_fds = mfree(p->auxiliary_fds);
1407 p->n_auxiliary_fds = 0;
1408
1409 return r;
1410 }
1411
1412 static int socket_determine_selinux_label(Socket *s, char **ret) {
1413 Service *service;
1414 ExecCommand *c;
1415 _cleanup_free_ char *path = NULL;
1416 int r;
1417
1418 assert(s);
1419 assert(ret);
1420
1421 if (s->selinux_context_from_net) {
1422 /* If this is requested, get label from the network label */
1423
1424 r = mac_selinux_get_our_label(ret);
1425 if (r == -EOPNOTSUPP)
1426 goto no_label;
1427
1428 } else {
1429 /* Otherwise, get it from the executable we are about to start */
1430 r = socket_instantiate_service(s);
1431 if (r < 0)
1432 return r;
1433
1434 if (!UNIT_ISSET(s->service))
1435 goto no_label;
1436
1437 service = SERVICE(UNIT_DEREF(s->service));
1438 c = service->exec_command[SERVICE_EXEC_START];
1439 if (!c)
1440 goto no_label;
1441
1442 r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
1443 if (r < 0)
1444 goto no_label;
1445
1446 r = mac_selinux_get_create_label_from_exe(path, ret);
1447 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1448 goto no_label;
1449 }
1450
1451 return r;
1452
1453 no_label:
1454 *ret = NULL;
1455 return 0;
1456 }
1457
1458 static int socket_address_listen_do(
1459 Socket *s,
1460 const SocketAddress *address,
1461 const char *label) {
1462
1463 assert(s);
1464 assert(address);
1465
1466 return socket_address_listen(
1467 address,
1468 SOCK_CLOEXEC|SOCK_NONBLOCK,
1469 s->backlog,
1470 s->bind_ipv6_only,
1471 s->bind_to_device,
1472 s->reuse_port,
1473 s->free_bind,
1474 s->transparent,
1475 s->directory_mode,
1476 s->socket_mode,
1477 label);
1478 }
1479
1480 static int socket_address_listen_in_cgroup(
1481 Socket *s,
1482 const SocketAddress *address,
1483 const char *label) {
1484
1485 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1486 int fd, r;
1487 pid_t pid;
1488
1489 assert(s);
1490 assert(address);
1491
1492 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1493 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1494 * unit's cgroup for the purpose of BPF filtering and such. */
1495
1496 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1497 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1498
1499 r = bpf_firewall_supported();
1500 if (r < 0)
1501 return r;
1502 if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1503 goto shortcut;
1504
1505 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1506 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1507
1508 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1509 if (r < 0)
1510 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1511 if (r == 0) {
1512 /* Child */
1513
1514 pair[0] = safe_close(pair[0]);
1515
1516 fd = socket_address_listen_do(s, address, label);
1517 if (fd < 0) {
1518 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1519 _exit(EXIT_FAILURE);
1520 }
1521
1522 r = send_one_fd(pair[1], fd, 0);
1523 if (r < 0) {
1524 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1525 _exit(EXIT_FAILURE);
1526 }
1527
1528 _exit(EXIT_SUCCESS);
1529 }
1530
1531 pair[1] = safe_close(pair[1]);
1532 fd = receive_one_fd(pair[0], 0);
1533
1534 /* We synchronously wait for the helper, as it shouldn't be slow */
1535 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1536 if (r < 0) {
1537 safe_close(fd);
1538 return r;
1539 }
1540
1541 if (fd < 0)
1542 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1543
1544 return fd;
1545
1546 shortcut:
1547 fd = socket_address_listen_do(s, address, label);
1548 if (fd < 0)
1549 return log_error_errno(fd, "Failed to create listening socket: %m");
1550
1551 return fd;
1552 }
1553
1554 static int socket_open_fds(Socket *s) {
1555 _cleanup_(mac_selinux_freep) char *label = NULL;
1556 bool know_label = false;
1557 SocketPort *p;
1558 int r;
1559
1560 assert(s);
1561
1562 LIST_FOREACH(port, p, s->ports) {
1563
1564 if (p->fd >= 0)
1565 continue;
1566
1567 switch (p->type) {
1568
1569 case SOCKET_SOCKET:
1570
1571 if (!know_label) {
1572 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1573 * we need this and remember it for the rest. */
1574
1575 r = socket_determine_selinux_label(s, &label);
1576 if (r < 0)
1577 goto rollback;
1578
1579 know_label = true;
1580 }
1581
1582 /* Apply the socket protocol */
1583 switch (p->address.type) {
1584
1585 case SOCK_STREAM:
1586 case SOCK_SEQPACKET:
1587 if (s->socket_protocol == IPPROTO_SCTP)
1588 p->address.protocol = s->socket_protocol;
1589 break;
1590
1591 case SOCK_DGRAM:
1592 if (s->socket_protocol == IPPROTO_UDPLITE)
1593 p->address.protocol = s->socket_protocol;
1594 break;
1595 }
1596
1597 r = socket_address_listen_in_cgroup(s, &p->address, label);
1598 if (r < 0)
1599 goto rollback;
1600
1601 p->fd = r;
1602 socket_apply_socket_options(s, p->fd);
1603 socket_symlink(s);
1604 break;
1605
1606 case SOCKET_SPECIAL:
1607
1608 p->fd = special_address_create(p->path, s->writable);
1609 if (p->fd < 0) {
1610 r = p->fd;
1611 goto rollback;
1612 }
1613 break;
1614
1615 case SOCKET_FIFO:
1616
1617 p->fd = fifo_address_create(
1618 p->path,
1619 s->directory_mode,
1620 s->socket_mode);
1621 if (p->fd < 0) {
1622 r = p->fd;
1623 goto rollback;
1624 }
1625
1626 socket_apply_fifo_options(s, p->fd);
1627 socket_symlink(s);
1628 break;
1629
1630 case SOCKET_MQUEUE:
1631
1632 p->fd = mq_address_create(
1633 p->path,
1634 s->socket_mode,
1635 s->mq_maxmsg,
1636 s->mq_msgsize);
1637 if (p->fd < 0) {
1638 r = p->fd;
1639 goto rollback;
1640 }
1641 break;
1642
1643 case SOCKET_USB_FUNCTION: {
1644 _cleanup_free_ char *ep = NULL;
1645
1646 ep = path_make_absolute("ep0", p->path);
1647
1648 p->fd = usbffs_address_create(ep);
1649 if (p->fd < 0) {
1650 r = p->fd;
1651 goto rollback;
1652 }
1653
1654 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1655 if (r < 0)
1656 goto rollback;
1657
1658 r = usbffs_dispatch_eps(p);
1659 if (r < 0)
1660 goto rollback;
1661
1662 break;
1663 }
1664 default:
1665 assert_not_reached("Unknown port type");
1666 }
1667 }
1668
1669 return 0;
1670
1671 rollback:
1672 socket_close_fds(s);
1673 return r;
1674 }
1675
1676 static void socket_unwatch_fds(Socket *s) {
1677 SocketPort *p;
1678 int r;
1679
1680 assert(s);
1681
1682 LIST_FOREACH(port, p, s->ports) {
1683 if (p->fd < 0)
1684 continue;
1685
1686 if (!p->event_source)
1687 continue;
1688
1689 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1690 if (r < 0)
1691 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1692 }
1693 }
1694
1695 static int socket_watch_fds(Socket *s) {
1696 SocketPort *p;
1697 int r;
1698
1699 assert(s);
1700
1701 LIST_FOREACH(port, p, s->ports) {
1702 if (p->fd < 0)
1703 continue;
1704
1705 if (p->event_source) {
1706 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1707 if (r < 0)
1708 goto fail;
1709 } else {
1710 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1711 if (r < 0)
1712 goto fail;
1713
1714 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1715 }
1716 }
1717
1718 return 0;
1719
1720 fail:
1721 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1722 socket_unwatch_fds(s);
1723 return r;
1724 }
1725
1726 enum {
1727 SOCKET_OPEN_NONE,
1728 SOCKET_OPEN_SOME,
1729 SOCKET_OPEN_ALL,
1730 };
1731
1732 static int socket_check_open(Socket *s) {
1733 bool have_open = false, have_closed = false;
1734 SocketPort *p;
1735
1736 assert(s);
1737
1738 LIST_FOREACH(port, p, s->ports) {
1739 if (p->fd < 0)
1740 have_closed = true;
1741 else
1742 have_open = true;
1743
1744 if (have_open && have_closed)
1745 return SOCKET_OPEN_SOME;
1746 }
1747
1748 if (have_open)
1749 return SOCKET_OPEN_ALL;
1750
1751 return SOCKET_OPEN_NONE;
1752 }
1753
1754 static void socket_set_state(Socket *s, SocketState state) {
1755 SocketState old_state;
1756 assert(s);
1757
1758 old_state = s->state;
1759 s->state = state;
1760
1761 if (!IN_SET(state,
1762 SOCKET_START_PRE,
1763 SOCKET_START_CHOWN,
1764 SOCKET_START_POST,
1765 SOCKET_STOP_PRE,
1766 SOCKET_STOP_PRE_SIGTERM,
1767 SOCKET_STOP_PRE_SIGKILL,
1768 SOCKET_STOP_POST,
1769 SOCKET_FINAL_SIGTERM,
1770 SOCKET_FINAL_SIGKILL)) {
1771
1772 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1773 socket_unwatch_control_pid(s);
1774 s->control_command = NULL;
1775 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1776 }
1777
1778 if (state != SOCKET_LISTENING)
1779 socket_unwatch_fds(s);
1780
1781 if (!IN_SET(state,
1782 SOCKET_START_CHOWN,
1783 SOCKET_START_POST,
1784 SOCKET_LISTENING,
1785 SOCKET_RUNNING,
1786 SOCKET_STOP_PRE,
1787 SOCKET_STOP_PRE_SIGTERM,
1788 SOCKET_STOP_PRE_SIGKILL))
1789 socket_close_fds(s);
1790
1791 if (state != old_state)
1792 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1793
1794 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1795 }
1796
1797 static int socket_coldplug(Unit *u) {
1798 Socket *s = SOCKET(u);
1799 int r;
1800
1801 assert(s);
1802 assert(s->state == SOCKET_DEAD);
1803
1804 if (s->deserialized_state == s->state)
1805 return 0;
1806
1807 if (s->control_pid > 0 &&
1808 pid_is_unwaited(s->control_pid) &&
1809 IN_SET(s->deserialized_state,
1810 SOCKET_START_PRE,
1811 SOCKET_START_CHOWN,
1812 SOCKET_START_POST,
1813 SOCKET_STOP_PRE,
1814 SOCKET_STOP_PRE_SIGTERM,
1815 SOCKET_STOP_PRE_SIGKILL,
1816 SOCKET_STOP_POST,
1817 SOCKET_FINAL_SIGTERM,
1818 SOCKET_FINAL_SIGKILL)) {
1819
1820 r = unit_watch_pid(UNIT(s), s->control_pid);
1821 if (r < 0)
1822 return r;
1823
1824 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1825 if (r < 0)
1826 return r;
1827 }
1828
1829 if (IN_SET(s->deserialized_state,
1830 SOCKET_START_CHOWN,
1831 SOCKET_START_POST,
1832 SOCKET_LISTENING,
1833 SOCKET_RUNNING)) {
1834
1835 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1836 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1837 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1838 * and if there's a mismatch, warn loudly. */
1839
1840 r = socket_check_open(s);
1841 if (r == SOCKET_OPEN_NONE)
1842 log_unit_warning(UNIT(s),
1843 "Socket unit configuration has changed while unit has been running, "
1844 "no open socket file descriptor left. "
1845 "The socket unit is not functional until restarted.");
1846 else if (r == SOCKET_OPEN_SOME)
1847 log_unit_warning(UNIT(s),
1848 "Socket unit configuration has changed while unit has been running, "
1849 "and some socket file descriptors have not been opened yet. "
1850 "The socket unit is not fully functional until restarted.");
1851 }
1852
1853 if (s->deserialized_state == SOCKET_LISTENING) {
1854 r = socket_watch_fds(s);
1855 if (r < 0)
1856 return r;
1857 }
1858
1859 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
1860 (void) unit_setup_dynamic_creds(u);
1861 (void) unit_setup_exec_runtime(u);
1862 }
1863
1864 socket_set_state(s, s->deserialized_state);
1865 return 0;
1866 }
1867
1868 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1869
1870 ExecParameters exec_params = {
1871 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1872 .stdin_fd = -1,
1873 .stdout_fd = -1,
1874 .stderr_fd = -1,
1875 };
1876 pid_t pid;
1877 int r;
1878
1879 assert(s);
1880 assert(c);
1881 assert(_pid);
1882
1883 r = unit_prepare_exec(UNIT(s));
1884 if (r < 0)
1885 return r;
1886
1887 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1888 if (r < 0)
1889 return r;
1890
1891 unit_set_exec_params(UNIT(s), &exec_params);
1892
1893 exec_params.argv = c->argv;
1894
1895 r = exec_spawn(UNIT(s),
1896 c,
1897 &s->exec_context,
1898 &exec_params,
1899 s->exec_runtime,
1900 &s->dynamic_creds,
1901 &pid);
1902 if (r < 0)
1903 return r;
1904
1905 r = unit_watch_pid(UNIT(s), pid);
1906 if (r < 0)
1907 /* FIXME: we need to do something here */
1908 return r;
1909
1910 *_pid = pid;
1911
1912 return 0;
1913 }
1914
1915 static int socket_chown(Socket *s, pid_t *_pid) {
1916 pid_t pid;
1917 int r;
1918
1919 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1920 if (r < 0)
1921 goto fail;
1922
1923 /* We have to resolve the user names out-of-process, hence
1924 * let's fork here. It's messy, but well, what can we do? */
1925
1926 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1927 if (r < 0)
1928 return r;
1929 if (r == 0) {
1930 uid_t uid = UID_INVALID;
1931 gid_t gid = GID_INVALID;
1932 SocketPort *p;
1933
1934 /* Child */
1935
1936 if (!isempty(s->user)) {
1937 const char *user = s->user;
1938
1939 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1940 if (r < 0) {
1941 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1942 _exit(EXIT_USER);
1943 }
1944 }
1945
1946 if (!isempty(s->group)) {
1947 const char *group = s->group;
1948
1949 r = get_group_creds(&group, &gid);
1950 if (r < 0) {
1951 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1952 _exit(EXIT_GROUP);
1953 }
1954 }
1955
1956 LIST_FOREACH(port, p, s->ports) {
1957 const char *path = NULL;
1958
1959 if (p->type == SOCKET_SOCKET)
1960 path = socket_address_get_path(&p->address);
1961 else if (p->type == SOCKET_FIFO)
1962 path = p->path;
1963
1964 if (!path)
1965 continue;
1966
1967 if (chown(path, uid, gid) < 0) {
1968 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1969 _exit(EXIT_CHOWN);
1970 }
1971 }
1972
1973 _exit(EXIT_SUCCESS);
1974 }
1975
1976 r = unit_watch_pid(UNIT(s), pid);
1977 if (r < 0)
1978 goto fail;
1979
1980 *_pid = pid;
1981 return 0;
1982
1983 fail:
1984 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1985 return r;
1986 }
1987
1988 static void socket_enter_dead(Socket *s, SocketResult f) {
1989 assert(s);
1990
1991 if (s->result == SOCKET_SUCCESS)
1992 s->result = f;
1993
1994 if (s->result != SOCKET_SUCCESS)
1995 log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
1996
1997 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1998
1999 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2000
2001 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
2002
2003 unit_unref_uid_gid(UNIT(s), true);
2004
2005 dynamic_creds_destroy(&s->dynamic_creds);
2006 }
2007
2008 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2009
2010 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2011 int r;
2012 assert(s);
2013
2014 if (s->result == SOCKET_SUCCESS)
2015 s->result = f;
2016
2017 socket_unwatch_control_pid(s);
2018 s->control_command_id = SOCKET_EXEC_STOP_POST;
2019 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2020
2021 if (s->control_command) {
2022 r = socket_spawn(s, s->control_command, &s->control_pid);
2023 if (r < 0)
2024 goto fail;
2025
2026 socket_set_state(s, SOCKET_STOP_POST);
2027 } else
2028 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2029
2030 return;
2031
2032 fail:
2033 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2034 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2035 }
2036
2037 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2038 int r;
2039
2040 assert(s);
2041
2042 if (s->result == SOCKET_SUCCESS)
2043 s->result = f;
2044
2045 r = unit_kill_context(
2046 UNIT(s),
2047 &s->kill_context,
2048 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2049 KILL_KILL : KILL_TERMINATE,
2050 -1,
2051 s->control_pid,
2052 false);
2053 if (r < 0)
2054 goto fail;
2055
2056 if (r > 0) {
2057 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2058 if (r < 0)
2059 goto fail;
2060
2061 socket_set_state(s, state);
2062 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2063 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2064 else if (state == SOCKET_STOP_PRE_SIGKILL)
2065 socket_enter_stop_post(s, SOCKET_SUCCESS);
2066 else if (state == SOCKET_FINAL_SIGTERM)
2067 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2068 else
2069 socket_enter_dead(s, SOCKET_SUCCESS);
2070
2071 return;
2072
2073 fail:
2074 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2075
2076 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2077 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2078 else
2079 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2080 }
2081
2082 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2083 int r;
2084 assert(s);
2085
2086 if (s->result == SOCKET_SUCCESS)
2087 s->result = f;
2088
2089 socket_unwatch_control_pid(s);
2090 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2091 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2092
2093 if (s->control_command) {
2094 r = socket_spawn(s, s->control_command, &s->control_pid);
2095 if (r < 0)
2096 goto fail;
2097
2098 socket_set_state(s, SOCKET_STOP_PRE);
2099 } else
2100 socket_enter_stop_post(s, SOCKET_SUCCESS);
2101
2102 return;
2103
2104 fail:
2105 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2106 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2107 }
2108
2109 static void socket_enter_listening(Socket *s) {
2110 int r;
2111 assert(s);
2112
2113 r = socket_watch_fds(s);
2114 if (r < 0) {
2115 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2116 goto fail;
2117 }
2118
2119 socket_set_state(s, SOCKET_LISTENING);
2120 return;
2121
2122 fail:
2123 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2124 }
2125
2126 static void socket_enter_start_post(Socket *s) {
2127 int r;
2128 assert(s);
2129
2130 socket_unwatch_control_pid(s);
2131 s->control_command_id = SOCKET_EXEC_START_POST;
2132 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2133
2134 if (s->control_command) {
2135 r = socket_spawn(s, s->control_command, &s->control_pid);
2136 if (r < 0) {
2137 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2138 goto fail;
2139 }
2140
2141 socket_set_state(s, SOCKET_START_POST);
2142 } else
2143 socket_enter_listening(s);
2144
2145 return;
2146
2147 fail:
2148 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2149 }
2150
2151 static void socket_enter_start_chown(Socket *s) {
2152 int r;
2153
2154 assert(s);
2155
2156 r = socket_open_fds(s);
2157 if (r < 0) {
2158 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2159 goto fail;
2160 }
2161
2162 if (!isempty(s->user) || !isempty(s->group)) {
2163
2164 socket_unwatch_control_pid(s);
2165 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2166 s->control_command = NULL;
2167
2168 r = socket_chown(s, &s->control_pid);
2169 if (r < 0) {
2170 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2171 goto fail;
2172 }
2173
2174 socket_set_state(s, SOCKET_START_CHOWN);
2175 } else
2176 socket_enter_start_post(s);
2177
2178 return;
2179
2180 fail:
2181 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2182 }
2183
2184 static void socket_enter_start_pre(Socket *s) {
2185 int r;
2186 assert(s);
2187
2188 socket_unwatch_control_pid(s);
2189
2190 unit_warn_leftover_processes(UNIT(s));
2191
2192 s->control_command_id = SOCKET_EXEC_START_PRE;
2193 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2194
2195 if (s->control_command) {
2196 r = socket_spawn(s, s->control_command, &s->control_pid);
2197 if (r < 0) {
2198 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2199 goto fail;
2200 }
2201
2202 socket_set_state(s, SOCKET_START_PRE);
2203 } else
2204 socket_enter_start_chown(s);
2205
2206 return;
2207
2208 fail:
2209 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2210 }
2211
2212 static void flush_ports(Socket *s) {
2213 SocketPort *p;
2214
2215 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2216 * anymore */
2217
2218 LIST_FOREACH(port, p, s->ports) {
2219 if (p->fd < 0)
2220 continue;
2221
2222 (void) flush_accept(p->fd);
2223 (void) flush_fd(p->fd);
2224 }
2225 }
2226
2227 static void socket_enter_running(Socket *s, int cfd) {
2228 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2229 int r;
2230
2231 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2232 * close it. */
2233
2234 assert(s);
2235
2236 /* We don't take connections anymore if we are supposed to shut down anyway */
2237 if (unit_stop_pending(UNIT(s))) {
2238
2239 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2240
2241 if (cfd >= 0)
2242 cfd = safe_close(cfd);
2243 else
2244 flush_ports(s);
2245
2246 return;
2247 }
2248
2249 if (!ratelimit_test(&s->trigger_limit)) {
2250 safe_close(cfd);
2251 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2252 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2253 return;
2254 }
2255
2256 if (cfd < 0) {
2257 bool pending = false;
2258 Unit *other;
2259 Iterator i;
2260 void *v;
2261
2262 /* If there's already a start pending don't bother to
2263 * do anything */
2264 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2265 if (unit_active_or_pending(other)) {
2266 pending = true;
2267 break;
2268 }
2269
2270 if (!pending) {
2271 if (!UNIT_ISSET(s->service)) {
2272 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2273 r = -ENOENT;
2274 goto fail;
2275 }
2276
2277 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2278 if (r < 0)
2279 goto fail;
2280 }
2281
2282 socket_set_state(s, SOCKET_RUNNING);
2283 } else {
2284 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2285 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2286 Service *service;
2287
2288 if (s->n_connections >= s->max_connections) {
2289 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2290 s->n_connections);
2291 safe_close(cfd);
2292 return;
2293 }
2294
2295 if (s->max_connections_per_source > 0) {
2296 r = socket_acquire_peer(s, cfd, &p);
2297 if (r < 0) {
2298 safe_close(cfd);
2299 return;
2300 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2301 _cleanup_free_ char *t = NULL;
2302
2303 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2304
2305 log_unit_warning(UNIT(s),
2306 "Too many incoming connections (%u) from source %s, dropping connection.",
2307 p->n_ref, strnull(t));
2308 safe_close(cfd);
2309 return;
2310 }
2311 }
2312
2313 r = socket_instantiate_service(s);
2314 if (r < 0)
2315 goto fail;
2316
2317 r = instance_from_socket(cfd, s->n_accepted, &instance);
2318 if (r < 0) {
2319 if (r != -ENOTCONN)
2320 goto fail;
2321
2322 /* ENOTCONN is legitimate if TCP RST was received.
2323 * This connection is over, but the socket unit lives on. */
2324 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2325 safe_close(cfd);
2326 return;
2327 }
2328
2329 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2330 if (r < 0)
2331 goto fail;
2332
2333 r = unit_name_build(prefix, instance, ".service", &name);
2334 if (r < 0)
2335 goto fail;
2336
2337 r = unit_add_name(UNIT_DEREF(s->service), name);
2338 if (r < 0)
2339 goto fail;
2340
2341 service = SERVICE(UNIT_DEREF(s->service));
2342 unit_ref_unset(&s->service);
2343
2344 s->n_accepted++;
2345 unit_choose_id(UNIT(service), name);
2346
2347 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2348 if (r < 0)
2349 goto fail;
2350
2351 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2352 s->n_connections++;
2353
2354 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2355
2356 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2357 if (r < 0) {
2358 /* We failed to activate the new service, but it still exists. Let's make sure the service
2359 * closes and forgets the connection fd again, immediately. */
2360 service_close_socket_fd(service);
2361 goto fail;
2362 }
2363
2364 /* Notify clients about changed counters */
2365 unit_add_to_dbus_queue(UNIT(s));
2366 }
2367
2368 return;
2369
2370 fail:
2371 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2372 cfd >= 0 ? "template" : "non-template",
2373 bus_error_message(&error, r));
2374
2375 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2376 safe_close(cfd);
2377 }
2378
2379 static void socket_run_next(Socket *s) {
2380 int r;
2381
2382 assert(s);
2383 assert(s->control_command);
2384 assert(s->control_command->command_next);
2385
2386 socket_unwatch_control_pid(s);
2387
2388 s->control_command = s->control_command->command_next;
2389
2390 r = socket_spawn(s, s->control_command, &s->control_pid);
2391 if (r < 0)
2392 goto fail;
2393
2394 return;
2395
2396 fail:
2397 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2398
2399 if (s->state == SOCKET_START_POST)
2400 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2401 else if (s->state == SOCKET_STOP_POST)
2402 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2403 else
2404 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2405 }
2406
2407 static int socket_start(Unit *u) {
2408 Socket *s = SOCKET(u);
2409 int r;
2410
2411 assert(s);
2412
2413 /* We cannot fulfill this request right now, try again later
2414 * please! */
2415 if (IN_SET(s->state,
2416 SOCKET_STOP_PRE,
2417 SOCKET_STOP_PRE_SIGKILL,
2418 SOCKET_STOP_PRE_SIGTERM,
2419 SOCKET_STOP_POST,
2420 SOCKET_FINAL_SIGTERM,
2421 SOCKET_FINAL_SIGKILL))
2422 return -EAGAIN;
2423
2424 /* Already on it! */
2425 if (IN_SET(s->state,
2426 SOCKET_START_PRE,
2427 SOCKET_START_CHOWN,
2428 SOCKET_START_POST))
2429 return 0;
2430
2431 /* Cannot run this without the service being around */
2432 if (UNIT_ISSET(s->service)) {
2433 Service *service;
2434
2435 service = SERVICE(UNIT_DEREF(s->service));
2436
2437 if (UNIT(service)->load_state != UNIT_LOADED) {
2438 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2439 return -ENOENT;
2440 }
2441
2442 /* If the service is already active we cannot start the
2443 * socket */
2444 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2445 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2446 return -EBUSY;
2447 }
2448 }
2449
2450 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2451
2452 r = unit_start_limit_test(u);
2453 if (r < 0) {
2454 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2455 return r;
2456 }
2457
2458 r = unit_acquire_invocation_id(u);
2459 if (r < 0)
2460 return r;
2461
2462 s->result = SOCKET_SUCCESS;
2463
2464 u->reset_accounting = true;
2465
2466 socket_enter_start_pre(s);
2467 return 1;
2468 }
2469
2470 static int socket_stop(Unit *u) {
2471 Socket *s = SOCKET(u);
2472
2473 assert(s);
2474
2475 /* Already on it */
2476 if (IN_SET(s->state,
2477 SOCKET_STOP_PRE,
2478 SOCKET_STOP_PRE_SIGTERM,
2479 SOCKET_STOP_PRE_SIGKILL,
2480 SOCKET_STOP_POST,
2481 SOCKET_FINAL_SIGTERM,
2482 SOCKET_FINAL_SIGKILL))
2483 return 0;
2484
2485 /* If there's already something running we go directly into
2486 * kill mode. */
2487 if (IN_SET(s->state,
2488 SOCKET_START_PRE,
2489 SOCKET_START_CHOWN,
2490 SOCKET_START_POST)) {
2491 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2492 return -EAGAIN;
2493 }
2494
2495 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2496
2497 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2498 return 1;
2499 }
2500
2501 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2502 Socket *s = SOCKET(u);
2503 SocketPort *p;
2504 int r;
2505
2506 assert(u);
2507 assert(f);
2508 assert(fds);
2509
2510 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2511 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2512 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2513
2514 if (s->control_pid > 0)
2515 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2516
2517 if (s->control_command_id >= 0)
2518 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2519
2520 LIST_FOREACH(port, p, s->ports) {
2521 int copy;
2522
2523 if (p->fd < 0)
2524 continue;
2525
2526 copy = fdset_put_dup(fds, p->fd);
2527 if (copy < 0)
2528 return copy;
2529
2530 if (p->type == SOCKET_SOCKET) {
2531 _cleanup_free_ char *t = NULL;
2532
2533 r = socket_address_print(&p->address, &t);
2534 if (r < 0)
2535 return r;
2536
2537 if (socket_address_family(&p->address) == AF_NETLINK)
2538 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2539 else
2540 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2541
2542 } else if (p->type == SOCKET_SPECIAL)
2543 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2544 else if (p->type == SOCKET_MQUEUE)
2545 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2546 else if (p->type == SOCKET_USB_FUNCTION)
2547 unit_serialize_item_format(u, f, "ffs", "%i %s", copy, p->path);
2548 else {
2549 assert(p->type == SOCKET_FIFO);
2550 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2551 }
2552 }
2553
2554 return 0;
2555 }
2556
2557 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2558 safe_close(p->fd);
2559 p->fd = fdset_remove(fds, fd);
2560 }
2561
2562 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2563 Socket *s = SOCKET(u);
2564
2565 assert(u);
2566 assert(key);
2567 assert(value);
2568
2569 if (streq(key, "state")) {
2570 SocketState state;
2571
2572 state = socket_state_from_string(value);
2573 if (state < 0)
2574 log_unit_debug(u, "Failed to parse state value: %s", value);
2575 else
2576 s->deserialized_state = state;
2577 } else if (streq(key, "result")) {
2578 SocketResult f;
2579
2580 f = socket_result_from_string(value);
2581 if (f < 0)
2582 log_unit_debug(u, "Failed to parse result value: %s", value);
2583 else if (f != SOCKET_SUCCESS)
2584 s->result = f;
2585
2586 } else if (streq(key, "n-accepted")) {
2587 unsigned k;
2588
2589 if (safe_atou(value, &k) < 0)
2590 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2591 else
2592 s->n_accepted += k;
2593 } else if (streq(key, "control-pid")) {
2594 pid_t pid;
2595
2596 if (parse_pid(value, &pid) < 0)
2597 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2598 else
2599 s->control_pid = pid;
2600 } else if (streq(key, "control-command")) {
2601 SocketExecCommand id;
2602
2603 id = socket_exec_command_from_string(value);
2604 if (id < 0)
2605 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2606 else {
2607 s->control_command_id = id;
2608 s->control_command = s->exec_command[id];
2609 }
2610 } else if (streq(key, "fifo")) {
2611 int fd, skip = 0;
2612 SocketPort *p;
2613
2614 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2615 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2616 else
2617 LIST_FOREACH(port, p, s->ports)
2618 if (p->type == SOCKET_FIFO &&
2619 path_equal_or_files_same(p->path, value+skip, 0)) {
2620 socket_port_take_fd(p, fds, fd);
2621 break;
2622 }
2623
2624 } else if (streq(key, "special")) {
2625 int fd, skip = 0;
2626 SocketPort *p;
2627
2628 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2629 log_unit_debug(u, "Failed to parse special value: %s", value);
2630 else
2631 LIST_FOREACH(port, p, s->ports)
2632 if (p->type == SOCKET_SPECIAL &&
2633 path_equal_or_files_same(p->path, value+skip, 0)) {
2634 socket_port_take_fd(p, fds, fd);
2635 break;
2636 }
2637
2638 } else if (streq(key, "mqueue")) {
2639 int fd, skip = 0;
2640 SocketPort *p;
2641
2642 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2643 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2644 else
2645 LIST_FOREACH(port, p, s->ports)
2646 if (p->type == SOCKET_MQUEUE &&
2647 streq(p->path, value+skip)) {
2648 socket_port_take_fd(p, fds, fd);
2649 break;
2650 }
2651
2652 } else if (streq(key, "socket")) {
2653 int fd, type, skip = 0;
2654 SocketPort *p;
2655
2656 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2657 log_unit_debug(u, "Failed to parse socket value: %s", value);
2658 else
2659 LIST_FOREACH(port, p, s->ports)
2660 if (socket_address_is(&p->address, value+skip, type)) {
2661 socket_port_take_fd(p, fds, fd);
2662 break;
2663 }
2664
2665 } else if (streq(key, "netlink")) {
2666 int fd, skip = 0;
2667 SocketPort *p;
2668
2669 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2670 log_unit_debug(u, "Failed to parse socket value: %s", value);
2671 else
2672 LIST_FOREACH(port, p, s->ports)
2673 if (socket_address_is_netlink(&p->address, value+skip)) {
2674 socket_port_take_fd(p, fds, fd);
2675 break;
2676 }
2677
2678 } else if (streq(key, "ffs")) {
2679 int fd, skip = 0;
2680 SocketPort *p;
2681
2682 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2683 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2684 else
2685 LIST_FOREACH(port, p, s->ports)
2686 if (p->type == SOCKET_USB_FUNCTION &&
2687 path_equal_or_files_same(p->path, value+skip, 0)) {
2688 socket_port_take_fd(p, fds, fd);
2689 break;
2690 }
2691
2692 } else
2693 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2694
2695 return 0;
2696 }
2697
2698 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2699 Socket *s = SOCKET(u);
2700 SocketPort *p;
2701
2702 assert(u);
2703
2704 LIST_FOREACH(port, p, s->ports) {
2705 Iterator i;
2706 int fd;
2707
2708 if (p->type != SOCKET_SOCKET)
2709 continue;
2710
2711 if (p->fd >= 0)
2712 continue;
2713
2714 FDSET_FOREACH(fd, fds, i) {
2715 if (socket_address_matches_fd(&p->address, fd)) {
2716 p->fd = fdset_remove(fds, fd);
2717 s->deserialized_state = SOCKET_LISTENING;
2718 break;
2719 }
2720 }
2721 }
2722 }
2723
2724 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2725 assert(u);
2726
2727 return state_translation_table[SOCKET(u)->state];
2728 }
2729
2730 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2731 assert(u);
2732
2733 return socket_state_to_string(SOCKET(u)->state);
2734 }
2735
2736 const char* socket_port_type_to_string(SocketPort *p) {
2737
2738 assert(p);
2739
2740 switch (p->type) {
2741
2742 case SOCKET_SOCKET:
2743
2744 switch (p->address.type) {
2745
2746 case SOCK_STREAM:
2747 return "Stream";
2748
2749 case SOCK_DGRAM:
2750 return "Datagram";
2751
2752 case SOCK_SEQPACKET:
2753 return "SequentialPacket";
2754
2755 case SOCK_RAW:
2756 if (socket_address_family(&p->address) == AF_NETLINK)
2757 return "Netlink";
2758
2759 _fallthrough_;
2760 default:
2761 return NULL;
2762 }
2763
2764 case SOCKET_SPECIAL:
2765 return "Special";
2766
2767 case SOCKET_MQUEUE:
2768 return "MessageQueue";
2769
2770 case SOCKET_FIFO:
2771 return "FIFO";
2772
2773 case SOCKET_USB_FUNCTION:
2774 return "USBFunction";
2775
2776 default:
2777 return NULL;
2778 }
2779 }
2780
2781 SocketType socket_port_type_from_string(const char *s) {
2782 assert(s);
2783
2784 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2785 return SOCKET_SOCKET;
2786 else if (streq(s, "Special"))
2787 return SOCKET_SPECIAL;
2788 else if (streq(s, "MessageQueue"))
2789 return SOCKET_MQUEUE;
2790 else if (streq(s, "FIFO"))
2791 return SOCKET_FIFO;
2792 else if (streq(s, "USBFunction"))
2793 return SOCKET_USB_FUNCTION;
2794 else
2795 return _SOCKET_TYPE_INVALID;
2796 }
2797
2798 _pure_ static bool socket_may_gc(Unit *u) {
2799 Socket *s = SOCKET(u);
2800
2801 assert(u);
2802
2803 return s->n_connections == 0;
2804 }
2805
2806 static int socket_accept_do(Socket *s, int fd) {
2807 int cfd;
2808
2809 assert(s);
2810 assert(fd >= 0);
2811
2812 for (;;) {
2813 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2814 if (cfd < 0) {
2815 if (errno == EINTR)
2816 continue;
2817
2818 return -errno;
2819 }
2820
2821 break;
2822 }
2823
2824 return cfd;
2825 }
2826
2827 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2828 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2829 int cfd, r;
2830 pid_t pid;
2831
2832 assert(s);
2833 assert(p);
2834 assert(fd >= 0);
2835
2836 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2837 * connection socket is also properly associated with the cgroup. */
2838
2839 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2840 goto shortcut;
2841
2842 r = bpf_firewall_supported();
2843 if (r < 0)
2844 return r;
2845 if (r == BPF_FIREWALL_UNSUPPORTED)
2846 goto shortcut;
2847
2848 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2849 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2850
2851 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2852 if (r < 0)
2853 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2854 if (r == 0) {
2855 /* Child */
2856
2857 pair[0] = safe_close(pair[0]);
2858
2859 cfd = socket_accept_do(s, fd);
2860 if (cfd < 0) {
2861 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2862 _exit(EXIT_FAILURE);
2863 }
2864
2865 r = send_one_fd(pair[1], cfd, 0);
2866 if (r < 0) {
2867 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2868 _exit(EXIT_FAILURE);
2869 }
2870
2871 _exit(EXIT_SUCCESS);
2872 }
2873
2874 pair[1] = safe_close(pair[1]);
2875 cfd = receive_one_fd(pair[0], 0);
2876
2877 /* We synchronously wait for the helper, as it shouldn't be slow */
2878 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2879 if (r < 0) {
2880 safe_close(cfd);
2881 return r;
2882 }
2883
2884 if (cfd < 0)
2885 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2886
2887 return cfd;
2888
2889 shortcut:
2890 cfd = socket_accept_do(s, fd);
2891 if (cfd < 0)
2892 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2893
2894 return cfd;
2895 }
2896
2897 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2898 SocketPort *p = userdata;
2899 int cfd = -1;
2900
2901 assert(p);
2902 assert(fd >= 0);
2903
2904 if (p->socket->state != SOCKET_LISTENING)
2905 return 0;
2906
2907 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2908
2909 if (revents != EPOLLIN) {
2910
2911 if (revents & EPOLLHUP)
2912 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.");
2913 else
2914 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2915 goto fail;
2916 }
2917
2918 if (p->socket->accept &&
2919 p->type == SOCKET_SOCKET &&
2920 socket_address_can_accept(&p->address)) {
2921
2922 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2923 if (cfd < 0)
2924 goto fail;
2925
2926 socket_apply_socket_options(p->socket, cfd);
2927 }
2928
2929 socket_enter_running(p->socket, cfd);
2930 return 0;
2931
2932 fail:
2933 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2934 return 0;
2935 }
2936
2937 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2938 Socket *s = SOCKET(u);
2939 SocketResult f;
2940
2941 assert(s);
2942 assert(pid >= 0);
2943
2944 if (pid != s->control_pid)
2945 return;
2946
2947 s->control_pid = 0;
2948
2949 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2950 f = SOCKET_SUCCESS;
2951 else if (code == CLD_EXITED)
2952 f = SOCKET_FAILURE_EXIT_CODE;
2953 else if (code == CLD_KILLED)
2954 f = SOCKET_FAILURE_SIGNAL;
2955 else if (code == CLD_DUMPED)
2956 f = SOCKET_FAILURE_CORE_DUMP;
2957 else
2958 assert_not_reached("Unknown sigchld code");
2959
2960 if (s->control_command) {
2961 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2962
2963 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2964 f = SOCKET_SUCCESS;
2965 }
2966
2967 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2968 "Control process exited, code=%s status=%i",
2969 sigchld_code_to_string(code), status);
2970
2971 if (s->result == SOCKET_SUCCESS)
2972 s->result = f;
2973
2974 if (s->control_command &&
2975 s->control_command->command_next &&
2976 f == SOCKET_SUCCESS) {
2977
2978 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2979 socket_run_next(s);
2980 } else {
2981 s->control_command = NULL;
2982 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2983
2984 /* No further commands for this step, so let's figure
2985 * out what to do next */
2986
2987 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2988
2989 switch (s->state) {
2990
2991 case SOCKET_START_PRE:
2992 if (f == SOCKET_SUCCESS)
2993 socket_enter_start_chown(s);
2994 else
2995 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2996 break;
2997
2998 case SOCKET_START_CHOWN:
2999 if (f == SOCKET_SUCCESS)
3000 socket_enter_start_post(s);
3001 else
3002 socket_enter_stop_pre(s, f);
3003 break;
3004
3005 case SOCKET_START_POST:
3006 if (f == SOCKET_SUCCESS)
3007 socket_enter_listening(s);
3008 else
3009 socket_enter_stop_pre(s, f);
3010 break;
3011
3012 case SOCKET_STOP_PRE:
3013 case SOCKET_STOP_PRE_SIGTERM:
3014 case SOCKET_STOP_PRE_SIGKILL:
3015 socket_enter_stop_post(s, f);
3016 break;
3017
3018 case SOCKET_STOP_POST:
3019 case SOCKET_FINAL_SIGTERM:
3020 case SOCKET_FINAL_SIGKILL:
3021 socket_enter_dead(s, f);
3022 break;
3023
3024 default:
3025 assert_not_reached("Uh, control process died at wrong time.");
3026 }
3027 }
3028
3029 /* Notify clients about changed exit status */
3030 unit_add_to_dbus_queue(u);
3031 }
3032
3033 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3034 Socket *s = SOCKET(userdata);
3035
3036 assert(s);
3037 assert(s->timer_event_source == source);
3038
3039 switch (s->state) {
3040
3041 case SOCKET_START_PRE:
3042 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3043 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3044 break;
3045
3046 case SOCKET_START_CHOWN:
3047 case SOCKET_START_POST:
3048 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3049 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3050 break;
3051
3052 case SOCKET_STOP_PRE:
3053 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3054 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3055 break;
3056
3057 case SOCKET_STOP_PRE_SIGTERM:
3058 if (s->kill_context.send_sigkill) {
3059 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3060 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3061 } else {
3062 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3063 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3064 }
3065 break;
3066
3067 case SOCKET_STOP_PRE_SIGKILL:
3068 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3069 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3070 break;
3071
3072 case SOCKET_STOP_POST:
3073 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3074 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3075 break;
3076
3077 case SOCKET_FINAL_SIGTERM:
3078 if (s->kill_context.send_sigkill) {
3079 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3080 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3081 } else {
3082 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3083 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3084 }
3085 break;
3086
3087 case SOCKET_FINAL_SIGKILL:
3088 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3089 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3090 break;
3091
3092 default:
3093 assert_not_reached("Timeout at wrong time.");
3094 }
3095
3096 return 0;
3097 }
3098
3099 int socket_collect_fds(Socket *s, int **fds) {
3100 int *rfds, k = 0, n = 0;
3101 SocketPort *p;
3102
3103 assert(s);
3104 assert(fds);
3105
3106 /* Called from the service code for requesting our fds */
3107
3108 LIST_FOREACH(port, p, s->ports) {
3109 if (p->fd >= 0)
3110 n++;
3111 n += p->n_auxiliary_fds;
3112 }
3113
3114 if (n <= 0) {
3115 *fds = NULL;
3116 return 0;
3117 }
3118
3119 rfds = new(int, n);
3120 if (!rfds)
3121 return -ENOMEM;
3122
3123 LIST_FOREACH(port, p, s->ports) {
3124 int i;
3125
3126 if (p->fd >= 0)
3127 rfds[k++] = p->fd;
3128 for (i = 0; i < p->n_auxiliary_fds; ++i)
3129 rfds[k++] = p->auxiliary_fds[i];
3130 }
3131
3132 assert(k == n);
3133
3134 *fds = rfds;
3135 return n;
3136 }
3137
3138 static void socket_reset_failed(Unit *u) {
3139 Socket *s = SOCKET(u);
3140
3141 assert(s);
3142
3143 if (s->state == SOCKET_FAILED)
3144 socket_set_state(s, SOCKET_DEAD);
3145
3146 s->result = SOCKET_SUCCESS;
3147 }
3148
3149 void socket_connection_unref(Socket *s) {
3150 assert(s);
3151
3152 /* The service is dead. Yay!
3153 *
3154 * This is strictly for one-instance-per-connection
3155 * services. */
3156
3157 assert(s->n_connections > 0);
3158 s->n_connections--;
3159
3160 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3161 }
3162
3163 static void socket_trigger_notify(Unit *u, Unit *other) {
3164 Socket *s = SOCKET(u);
3165
3166 assert(u);
3167 assert(other);
3168
3169 /* Filter out invocations with bogus state */
3170 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3171 return;
3172
3173 /* Don't propagate state changes from the service if we are already down */
3174 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3175 return;
3176
3177 /* We don't care for the service state if we are in Accept=yes mode */
3178 if (s->accept)
3179 return;
3180
3181 /* Propagate start limit hit state */
3182 if (other->start_limit_hit) {
3183 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3184 return;
3185 }
3186
3187 /* Don't propagate anything if there's still a job queued */
3188 if (other->job)
3189 return;
3190
3191 if (IN_SET(SERVICE(other)->state,
3192 SERVICE_DEAD, SERVICE_FAILED,
3193 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3194 SERVICE_AUTO_RESTART))
3195 socket_enter_listening(s);
3196
3197 if (SERVICE(other)->state == SERVICE_RUNNING)
3198 socket_set_state(s, SOCKET_RUNNING);
3199 }
3200
3201 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3202 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3203 }
3204
3205 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3206 Socket *s = SOCKET(u);
3207 usec_t t;
3208 int r;
3209
3210 if (!s->timer_event_source)
3211 return 0;
3212
3213 r = sd_event_source_get_time(s->timer_event_source, &t);
3214 if (r < 0)
3215 return r;
3216 if (t == USEC_INFINITY)
3217 return 0;
3218
3219 *timeout = t;
3220 return 1;
3221 }
3222
3223 char *socket_fdname(Socket *s) {
3224 assert(s);
3225
3226 /* Returns the name to use for $LISTEN_NAMES. If the user
3227 * didn't specify anything specifically, use the socket unit's
3228 * name as fallback. */
3229
3230 return s->fdname ?: UNIT(s)->id;
3231 }
3232
3233 static int socket_control_pid(Unit *u) {
3234 Socket *s = SOCKET(u);
3235
3236 assert(s);
3237
3238 return s->control_pid;
3239 }
3240
3241 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3242 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3243 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3244 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3245 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3246 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3247 };
3248
3249 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3250
3251 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3252 [SOCKET_SUCCESS] = "success",
3253 [SOCKET_FAILURE_RESOURCES] = "resources",
3254 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3255 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3256 [SOCKET_FAILURE_SIGNAL] = "signal",
3257 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3258 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3259 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3260 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3261 };
3262
3263 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3264
3265 const UnitVTable socket_vtable = {
3266 .object_size = sizeof(Socket),
3267 .exec_context_offset = offsetof(Socket, exec_context),
3268 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3269 .kill_context_offset = offsetof(Socket, kill_context),
3270 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3271 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3272
3273 .sections =
3274 "Unit\0"
3275 "Socket\0"
3276 "Install\0",
3277 .private_section = "Socket",
3278
3279 .can_transient = true,
3280
3281 .init = socket_init,
3282 .done = socket_done,
3283 .load = socket_load,
3284
3285 .coldplug = socket_coldplug,
3286
3287 .dump = socket_dump,
3288
3289 .start = socket_start,
3290 .stop = socket_stop,
3291
3292 .kill = socket_kill,
3293
3294 .get_timeout = socket_get_timeout,
3295
3296 .serialize = socket_serialize,
3297 .deserialize_item = socket_deserialize_item,
3298 .distribute_fds = socket_distribute_fds,
3299
3300 .active_state = socket_active_state,
3301 .sub_state_to_string = socket_sub_state_to_string,
3302
3303 .may_gc = socket_may_gc,
3304
3305 .sigchld_event = socket_sigchld_event,
3306
3307 .trigger_notify = socket_trigger_notify,
3308
3309 .reset_failed = socket_reset_failed,
3310
3311 .control_pid = socket_control_pid,
3312
3313 .bus_vtable = bus_socket_vtable,
3314 .bus_set_property = bus_socket_set_property,
3315 .bus_commit_properties = bus_socket_commit_properties,
3316
3317 .status_message_formats = {
3318 /*.starting_stopping = {
3319 [0] = "Starting socket %s...",
3320 [1] = "Stopping socket %s...",
3321 },*/
3322 .finished_start_job = {
3323 [JOB_DONE] = "Listening on %s.",
3324 [JOB_FAILED] = "Failed to listen on %s.",
3325 [JOB_TIMEOUT] = "Timed out starting %s.",
3326 },
3327 .finished_stop_job = {
3328 [JOB_DONE] = "Closed %s.",
3329 [JOB_FAILED] = "Failed stopping %s.",
3330 [JOB_TIMEOUT] = "Timed out stopping %s.",
3331 },
3332 },
3333 };
Unnamed repository; edit this file 'description' to name the repository.