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Merge pull request #8815 from poettering/get-unit-by-cgroup
[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 size_t n, k, i;
1370 int r;
1371
1372 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1373 if (r < 0)
1374 return -errno;
1375
1376 n = (size_t) r;
1377 p->auxiliary_fds = new(int, n);
1378 if (!p->auxiliary_fds)
1379 return -ENOMEM;
1380
1381 p->n_auxiliary_fds = n;
1382
1383 k = 0;
1384 for (i = 0; i < n; ++i) {
1385 _cleanup_free_ char *ep = NULL;
1386
1387 ep = path_make_absolute(ent[i]->d_name, p->path);
1388 if (!ep)
1389 return -ENOMEM;
1390
1391 path_kill_slashes(ep);
1392
1393 r = usbffs_address_create(ep);
1394 if (r < 0)
1395 goto fail;
1396
1397 p->auxiliary_fds[k++] = r;
1398 free(ent[i]);
1399 }
1400
1401 return r;
1402
1403 fail:
1404 close_many(p->auxiliary_fds, k);
1405 p->auxiliary_fds = mfree(p->auxiliary_fds);
1406 p->n_auxiliary_fds = 0;
1407
1408 return r;
1409 }
1410
1411 static int socket_determine_selinux_label(Socket *s, char **ret) {
1412 Service *service;
1413 ExecCommand *c;
1414 _cleanup_free_ char *path = NULL;
1415 int r;
1416
1417 assert(s);
1418 assert(ret);
1419
1420 if (s->selinux_context_from_net) {
1421 /* If this is requested, get label from the network label */
1422
1423 r = mac_selinux_get_our_label(ret);
1424 if (r == -EOPNOTSUPP)
1425 goto no_label;
1426
1427 } else {
1428 /* Otherwise, get it from the executable we are about to start */
1429 r = socket_instantiate_service(s);
1430 if (r < 0)
1431 return r;
1432
1433 if (!UNIT_ISSET(s->service))
1434 goto no_label;
1435
1436 service = SERVICE(UNIT_DEREF(s->service));
1437 c = service->exec_command[SERVICE_EXEC_START];
1438 if (!c)
1439 goto no_label;
1440
1441 r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
1442 if (r < 0)
1443 goto no_label;
1444
1445 r = mac_selinux_get_create_label_from_exe(path, ret);
1446 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1447 goto no_label;
1448 }
1449
1450 return r;
1451
1452 no_label:
1453 *ret = NULL;
1454 return 0;
1455 }
1456
1457 static int socket_address_listen_do(
1458 Socket *s,
1459 const SocketAddress *address,
1460 const char *label) {
1461
1462 assert(s);
1463 assert(address);
1464
1465 return socket_address_listen(
1466 address,
1467 SOCK_CLOEXEC|SOCK_NONBLOCK,
1468 s->backlog,
1469 s->bind_ipv6_only,
1470 s->bind_to_device,
1471 s->reuse_port,
1472 s->free_bind,
1473 s->transparent,
1474 s->directory_mode,
1475 s->socket_mode,
1476 label);
1477 }
1478
1479 static int socket_address_listen_in_cgroup(
1480 Socket *s,
1481 const SocketAddress *address,
1482 const char *label) {
1483
1484 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1485 int fd, r;
1486 pid_t pid;
1487
1488 assert(s);
1489 assert(address);
1490
1491 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1492 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1493 * unit's cgroup for the purpose of BPF filtering and such. */
1494
1495 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1496 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1497
1498 r = bpf_firewall_supported();
1499 if (r < 0)
1500 return r;
1501 if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1502 goto shortcut;
1503
1504 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1505 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1506
1507 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1508 if (r < 0)
1509 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1510 if (r == 0) {
1511 /* Child */
1512
1513 pair[0] = safe_close(pair[0]);
1514
1515 fd = socket_address_listen_do(s, address, label);
1516 if (fd < 0) {
1517 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1518 _exit(EXIT_FAILURE);
1519 }
1520
1521 r = send_one_fd(pair[1], fd, 0);
1522 if (r < 0) {
1523 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1524 _exit(EXIT_FAILURE);
1525 }
1526
1527 _exit(EXIT_SUCCESS);
1528 }
1529
1530 pair[1] = safe_close(pair[1]);
1531 fd = receive_one_fd(pair[0], 0);
1532
1533 /* We synchronously wait for the helper, as it shouldn't be slow */
1534 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1535 if (r < 0) {
1536 safe_close(fd);
1537 return r;
1538 }
1539
1540 if (fd < 0)
1541 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1542
1543 return fd;
1544
1545 shortcut:
1546 fd = socket_address_listen_do(s, address, label);
1547 if (fd < 0)
1548 return log_error_errno(fd, "Failed to create listening socket: %m");
1549
1550 return fd;
1551 }
1552
1553 static int socket_open_fds(Socket *s) {
1554 _cleanup_(mac_selinux_freep) char *label = NULL;
1555 bool know_label = false;
1556 SocketPort *p;
1557 int r;
1558
1559 assert(s);
1560
1561 LIST_FOREACH(port, p, s->ports) {
1562
1563 if (p->fd >= 0)
1564 continue;
1565
1566 switch (p->type) {
1567
1568 case SOCKET_SOCKET:
1569
1570 if (!know_label) {
1571 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1572 * we need this and remember it for the rest. */
1573
1574 r = socket_determine_selinux_label(s, &label);
1575 if (r < 0)
1576 goto rollback;
1577
1578 know_label = true;
1579 }
1580
1581 /* Apply the socket protocol */
1582 switch (p->address.type) {
1583
1584 case SOCK_STREAM:
1585 case SOCK_SEQPACKET:
1586 if (s->socket_protocol == IPPROTO_SCTP)
1587 p->address.protocol = s->socket_protocol;
1588 break;
1589
1590 case SOCK_DGRAM:
1591 if (s->socket_protocol == IPPROTO_UDPLITE)
1592 p->address.protocol = s->socket_protocol;
1593 break;
1594 }
1595
1596 r = socket_address_listen_in_cgroup(s, &p->address, label);
1597 if (r < 0)
1598 goto rollback;
1599
1600 p->fd = r;
1601 socket_apply_socket_options(s, p->fd);
1602 socket_symlink(s);
1603 break;
1604
1605 case SOCKET_SPECIAL:
1606
1607 p->fd = special_address_create(p->path, s->writable);
1608 if (p->fd < 0) {
1609 r = p->fd;
1610 goto rollback;
1611 }
1612 break;
1613
1614 case SOCKET_FIFO:
1615
1616 p->fd = fifo_address_create(
1617 p->path,
1618 s->directory_mode,
1619 s->socket_mode);
1620 if (p->fd < 0) {
1621 r = p->fd;
1622 goto rollback;
1623 }
1624
1625 socket_apply_fifo_options(s, p->fd);
1626 socket_symlink(s);
1627 break;
1628
1629 case SOCKET_MQUEUE:
1630
1631 p->fd = mq_address_create(
1632 p->path,
1633 s->socket_mode,
1634 s->mq_maxmsg,
1635 s->mq_msgsize);
1636 if (p->fd < 0) {
1637 r = p->fd;
1638 goto rollback;
1639 }
1640 break;
1641
1642 case SOCKET_USB_FUNCTION: {
1643 _cleanup_free_ char *ep = NULL;
1644
1645 ep = path_make_absolute("ep0", p->path);
1646
1647 p->fd = usbffs_address_create(ep);
1648 if (p->fd < 0) {
1649 r = p->fd;
1650 goto rollback;
1651 }
1652
1653 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1654 if (r < 0)
1655 goto rollback;
1656
1657 r = usbffs_dispatch_eps(p);
1658 if (r < 0)
1659 goto rollback;
1660
1661 break;
1662 }
1663 default:
1664 assert_not_reached("Unknown port type");
1665 }
1666 }
1667
1668 return 0;
1669
1670 rollback:
1671 socket_close_fds(s);
1672 return r;
1673 }
1674
1675 static void socket_unwatch_fds(Socket *s) {
1676 SocketPort *p;
1677 int r;
1678
1679 assert(s);
1680
1681 LIST_FOREACH(port, p, s->ports) {
1682 if (p->fd < 0)
1683 continue;
1684
1685 if (!p->event_source)
1686 continue;
1687
1688 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1689 if (r < 0)
1690 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1691 }
1692 }
1693
1694 static int socket_watch_fds(Socket *s) {
1695 SocketPort *p;
1696 int r;
1697
1698 assert(s);
1699
1700 LIST_FOREACH(port, p, s->ports) {
1701 if (p->fd < 0)
1702 continue;
1703
1704 if (p->event_source) {
1705 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1706 if (r < 0)
1707 goto fail;
1708 } else {
1709 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1710 if (r < 0)
1711 goto fail;
1712
1713 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1714 }
1715 }
1716
1717 return 0;
1718
1719 fail:
1720 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1721 socket_unwatch_fds(s);
1722 return r;
1723 }
1724
1725 enum {
1726 SOCKET_OPEN_NONE,
1727 SOCKET_OPEN_SOME,
1728 SOCKET_OPEN_ALL,
1729 };
1730
1731 static int socket_check_open(Socket *s) {
1732 bool have_open = false, have_closed = false;
1733 SocketPort *p;
1734
1735 assert(s);
1736
1737 LIST_FOREACH(port, p, s->ports) {
1738 if (p->fd < 0)
1739 have_closed = true;
1740 else
1741 have_open = true;
1742
1743 if (have_open && have_closed)
1744 return SOCKET_OPEN_SOME;
1745 }
1746
1747 if (have_open)
1748 return SOCKET_OPEN_ALL;
1749
1750 return SOCKET_OPEN_NONE;
1751 }
1752
1753 static void socket_set_state(Socket *s, SocketState state) {
1754 SocketState old_state;
1755 assert(s);
1756
1757 old_state = s->state;
1758 s->state = state;
1759
1760 if (!IN_SET(state,
1761 SOCKET_START_PRE,
1762 SOCKET_START_CHOWN,
1763 SOCKET_START_POST,
1764 SOCKET_STOP_PRE,
1765 SOCKET_STOP_PRE_SIGTERM,
1766 SOCKET_STOP_PRE_SIGKILL,
1767 SOCKET_STOP_POST,
1768 SOCKET_FINAL_SIGTERM,
1769 SOCKET_FINAL_SIGKILL)) {
1770
1771 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1772 socket_unwatch_control_pid(s);
1773 s->control_command = NULL;
1774 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1775 }
1776
1777 if (state != SOCKET_LISTENING)
1778 socket_unwatch_fds(s);
1779
1780 if (!IN_SET(state,
1781 SOCKET_START_CHOWN,
1782 SOCKET_START_POST,
1783 SOCKET_LISTENING,
1784 SOCKET_RUNNING,
1785 SOCKET_STOP_PRE,
1786 SOCKET_STOP_PRE_SIGTERM,
1787 SOCKET_STOP_PRE_SIGKILL))
1788 socket_close_fds(s);
1789
1790 if (state != old_state)
1791 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1792
1793 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1794 }
1795
1796 static int socket_coldplug(Unit *u) {
1797 Socket *s = SOCKET(u);
1798 int r;
1799
1800 assert(s);
1801 assert(s->state == SOCKET_DEAD);
1802
1803 if (s->deserialized_state == s->state)
1804 return 0;
1805
1806 if (s->control_pid > 0 &&
1807 pid_is_unwaited(s->control_pid) &&
1808 IN_SET(s->deserialized_state,
1809 SOCKET_START_PRE,
1810 SOCKET_START_CHOWN,
1811 SOCKET_START_POST,
1812 SOCKET_STOP_PRE,
1813 SOCKET_STOP_PRE_SIGTERM,
1814 SOCKET_STOP_PRE_SIGKILL,
1815 SOCKET_STOP_POST,
1816 SOCKET_FINAL_SIGTERM,
1817 SOCKET_FINAL_SIGKILL)) {
1818
1819 r = unit_watch_pid(UNIT(s), s->control_pid);
1820 if (r < 0)
1821 return r;
1822
1823 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1824 if (r < 0)
1825 return r;
1826 }
1827
1828 if (IN_SET(s->deserialized_state,
1829 SOCKET_START_CHOWN,
1830 SOCKET_START_POST,
1831 SOCKET_LISTENING,
1832 SOCKET_RUNNING)) {
1833
1834 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1835 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1836 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1837 * and if there's a mismatch, warn loudly. */
1838
1839 r = socket_check_open(s);
1840 if (r == SOCKET_OPEN_NONE)
1841 log_unit_warning(UNIT(s),
1842 "Socket unit configuration has changed while unit has been running, "
1843 "no open socket file descriptor left. "
1844 "The socket unit is not functional until restarted.");
1845 else if (r == SOCKET_OPEN_SOME)
1846 log_unit_warning(UNIT(s),
1847 "Socket unit configuration has changed while unit has been running, "
1848 "and some socket file descriptors have not been opened yet. "
1849 "The socket unit is not fully functional until restarted.");
1850 }
1851
1852 if (s->deserialized_state == SOCKET_LISTENING) {
1853 r = socket_watch_fds(s);
1854 if (r < 0)
1855 return r;
1856 }
1857
1858 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
1859 (void) unit_setup_dynamic_creds(u);
1860 (void) unit_setup_exec_runtime(u);
1861 }
1862
1863 socket_set_state(s, s->deserialized_state);
1864 return 0;
1865 }
1866
1867 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1868
1869 ExecParameters exec_params = {
1870 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1871 .stdin_fd = -1,
1872 .stdout_fd = -1,
1873 .stderr_fd = -1,
1874 };
1875 pid_t pid;
1876 int r;
1877
1878 assert(s);
1879 assert(c);
1880 assert(_pid);
1881
1882 r = unit_prepare_exec(UNIT(s));
1883 if (r < 0)
1884 return r;
1885
1886 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1887 if (r < 0)
1888 return r;
1889
1890 unit_set_exec_params(UNIT(s), &exec_params);
1891
1892 exec_params.argv = c->argv;
1893
1894 r = exec_spawn(UNIT(s),
1895 c,
1896 &s->exec_context,
1897 &exec_params,
1898 s->exec_runtime,
1899 &s->dynamic_creds,
1900 &pid);
1901 if (r < 0)
1902 return r;
1903
1904 r = unit_watch_pid(UNIT(s), pid);
1905 if (r < 0)
1906 /* FIXME: we need to do something here */
1907 return r;
1908
1909 *_pid = pid;
1910
1911 return 0;
1912 }
1913
1914 static int socket_chown(Socket *s, pid_t *_pid) {
1915 pid_t pid;
1916 int r;
1917
1918 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1919 if (r < 0)
1920 goto fail;
1921
1922 /* We have to resolve the user names out-of-process, hence
1923 * let's fork here. It's messy, but well, what can we do? */
1924
1925 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1926 if (r < 0)
1927 return r;
1928 if (r == 0) {
1929 uid_t uid = UID_INVALID;
1930 gid_t gid = GID_INVALID;
1931 SocketPort *p;
1932
1933 /* Child */
1934
1935 if (!isempty(s->user)) {
1936 const char *user = s->user;
1937
1938 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1939 if (r < 0) {
1940 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1941 _exit(EXIT_USER);
1942 }
1943 }
1944
1945 if (!isempty(s->group)) {
1946 const char *group = s->group;
1947
1948 r = get_group_creds(&group, &gid);
1949 if (r < 0) {
1950 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1951 _exit(EXIT_GROUP);
1952 }
1953 }
1954
1955 LIST_FOREACH(port, p, s->ports) {
1956 const char *path = NULL;
1957
1958 if (p->type == SOCKET_SOCKET)
1959 path = socket_address_get_path(&p->address);
1960 else if (p->type == SOCKET_FIFO)
1961 path = p->path;
1962
1963 if (!path)
1964 continue;
1965
1966 if (chown(path, uid, gid) < 0) {
1967 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1968 _exit(EXIT_CHOWN);
1969 }
1970 }
1971
1972 _exit(EXIT_SUCCESS);
1973 }
1974
1975 r = unit_watch_pid(UNIT(s), pid);
1976 if (r < 0)
1977 goto fail;
1978
1979 *_pid = pid;
1980 return 0;
1981
1982 fail:
1983 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1984 return r;
1985 }
1986
1987 static void socket_enter_dead(Socket *s, SocketResult f) {
1988 assert(s);
1989
1990 if (s->result == SOCKET_SUCCESS)
1991 s->result = f;
1992
1993 if (s->result != SOCKET_SUCCESS)
1994 log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
1995
1996 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1997
1998 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1999
2000 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
2001
2002 unit_unref_uid_gid(UNIT(s), true);
2003
2004 dynamic_creds_destroy(&s->dynamic_creds);
2005 }
2006
2007 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2008
2009 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2010 int r;
2011 assert(s);
2012
2013 if (s->result == SOCKET_SUCCESS)
2014 s->result = f;
2015
2016 socket_unwatch_control_pid(s);
2017 s->control_command_id = SOCKET_EXEC_STOP_POST;
2018 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2019
2020 if (s->control_command) {
2021 r = socket_spawn(s, s->control_command, &s->control_pid);
2022 if (r < 0)
2023 goto fail;
2024
2025 socket_set_state(s, SOCKET_STOP_POST);
2026 } else
2027 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2028
2029 return;
2030
2031 fail:
2032 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2033 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2034 }
2035
2036 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2037 int r;
2038
2039 assert(s);
2040
2041 if (s->result == SOCKET_SUCCESS)
2042 s->result = f;
2043
2044 r = unit_kill_context(
2045 UNIT(s),
2046 &s->kill_context,
2047 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2048 KILL_KILL : KILL_TERMINATE,
2049 -1,
2050 s->control_pid,
2051 false);
2052 if (r < 0)
2053 goto fail;
2054
2055 if (r > 0) {
2056 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2057 if (r < 0)
2058 goto fail;
2059
2060 socket_set_state(s, state);
2061 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2062 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2063 else if (state == SOCKET_STOP_PRE_SIGKILL)
2064 socket_enter_stop_post(s, SOCKET_SUCCESS);
2065 else if (state == SOCKET_FINAL_SIGTERM)
2066 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2067 else
2068 socket_enter_dead(s, SOCKET_SUCCESS);
2069
2070 return;
2071
2072 fail:
2073 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2074
2075 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2076 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2077 else
2078 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2079 }
2080
2081 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2082 int r;
2083 assert(s);
2084
2085 if (s->result == SOCKET_SUCCESS)
2086 s->result = f;
2087
2088 socket_unwatch_control_pid(s);
2089 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2090 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2091
2092 if (s->control_command) {
2093 r = socket_spawn(s, s->control_command, &s->control_pid);
2094 if (r < 0)
2095 goto fail;
2096
2097 socket_set_state(s, SOCKET_STOP_PRE);
2098 } else
2099 socket_enter_stop_post(s, SOCKET_SUCCESS);
2100
2101 return;
2102
2103 fail:
2104 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2105 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2106 }
2107
2108 static void socket_enter_listening(Socket *s) {
2109 int r;
2110 assert(s);
2111
2112 r = socket_watch_fds(s);
2113 if (r < 0) {
2114 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2115 goto fail;
2116 }
2117
2118 socket_set_state(s, SOCKET_LISTENING);
2119 return;
2120
2121 fail:
2122 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2123 }
2124
2125 static void socket_enter_start_post(Socket *s) {
2126 int r;
2127 assert(s);
2128
2129 socket_unwatch_control_pid(s);
2130 s->control_command_id = SOCKET_EXEC_START_POST;
2131 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2132
2133 if (s->control_command) {
2134 r = socket_spawn(s, s->control_command, &s->control_pid);
2135 if (r < 0) {
2136 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2137 goto fail;
2138 }
2139
2140 socket_set_state(s, SOCKET_START_POST);
2141 } else
2142 socket_enter_listening(s);
2143
2144 return;
2145
2146 fail:
2147 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2148 }
2149
2150 static void socket_enter_start_chown(Socket *s) {
2151 int r;
2152
2153 assert(s);
2154
2155 r = socket_open_fds(s);
2156 if (r < 0) {
2157 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2158 goto fail;
2159 }
2160
2161 if (!isempty(s->user) || !isempty(s->group)) {
2162
2163 socket_unwatch_control_pid(s);
2164 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2165 s->control_command = NULL;
2166
2167 r = socket_chown(s, &s->control_pid);
2168 if (r < 0) {
2169 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2170 goto fail;
2171 }
2172
2173 socket_set_state(s, SOCKET_START_CHOWN);
2174 } else
2175 socket_enter_start_post(s);
2176
2177 return;
2178
2179 fail:
2180 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2181 }
2182
2183 static void socket_enter_start_pre(Socket *s) {
2184 int r;
2185 assert(s);
2186
2187 socket_unwatch_control_pid(s);
2188
2189 unit_warn_leftover_processes(UNIT(s));
2190
2191 s->control_command_id = SOCKET_EXEC_START_PRE;
2192 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2193
2194 if (s->control_command) {
2195 r = socket_spawn(s, s->control_command, &s->control_pid);
2196 if (r < 0) {
2197 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2198 goto fail;
2199 }
2200
2201 socket_set_state(s, SOCKET_START_PRE);
2202 } else
2203 socket_enter_start_chown(s);
2204
2205 return;
2206
2207 fail:
2208 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2209 }
2210
2211 static void flush_ports(Socket *s) {
2212 SocketPort *p;
2213
2214 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2215 * anymore */
2216
2217 LIST_FOREACH(port, p, s->ports) {
2218 if (p->fd < 0)
2219 continue;
2220
2221 (void) flush_accept(p->fd);
2222 (void) flush_fd(p->fd);
2223 }
2224 }
2225
2226 static void socket_enter_running(Socket *s, int cfd) {
2227 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2228 int r;
2229
2230 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2231 * close it. */
2232
2233 assert(s);
2234
2235 /* We don't take connections anymore if we are supposed to shut down anyway */
2236 if (unit_stop_pending(UNIT(s))) {
2237
2238 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2239
2240 if (cfd >= 0)
2241 cfd = safe_close(cfd);
2242 else
2243 flush_ports(s);
2244
2245 return;
2246 }
2247
2248 if (!ratelimit_test(&s->trigger_limit)) {
2249 safe_close(cfd);
2250 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2251 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2252 return;
2253 }
2254
2255 if (cfd < 0) {
2256 bool pending = false;
2257 Unit *other;
2258 Iterator i;
2259 void *v;
2260
2261 /* If there's already a start pending don't bother to
2262 * do anything */
2263 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2264 if (unit_active_or_pending(other)) {
2265 pending = true;
2266 break;
2267 }
2268
2269 if (!pending) {
2270 if (!UNIT_ISSET(s->service)) {
2271 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2272 r = -ENOENT;
2273 goto fail;
2274 }
2275
2276 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2277 if (r < 0)
2278 goto fail;
2279 }
2280
2281 socket_set_state(s, SOCKET_RUNNING);
2282 } else {
2283 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2284 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2285 Service *service;
2286
2287 if (s->n_connections >= s->max_connections) {
2288 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2289 s->n_connections);
2290 safe_close(cfd);
2291 return;
2292 }
2293
2294 if (s->max_connections_per_source > 0) {
2295 r = socket_acquire_peer(s, cfd, &p);
2296 if (r < 0) {
2297 safe_close(cfd);
2298 return;
2299 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2300 _cleanup_free_ char *t = NULL;
2301
2302 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2303
2304 log_unit_warning(UNIT(s),
2305 "Too many incoming connections (%u) from source %s, dropping connection.",
2306 p->n_ref, strnull(t));
2307 safe_close(cfd);
2308 return;
2309 }
2310 }
2311
2312 r = socket_instantiate_service(s);
2313 if (r < 0)
2314 goto fail;
2315
2316 r = instance_from_socket(cfd, s->n_accepted, &instance);
2317 if (r < 0) {
2318 if (r != -ENOTCONN)
2319 goto fail;
2320
2321 /* ENOTCONN is legitimate if TCP RST was received.
2322 * This connection is over, but the socket unit lives on. */
2323 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2324 safe_close(cfd);
2325 return;
2326 }
2327
2328 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2329 if (r < 0)
2330 goto fail;
2331
2332 r = unit_name_build(prefix, instance, ".service", &name);
2333 if (r < 0)
2334 goto fail;
2335
2336 r = unit_add_name(UNIT_DEREF(s->service), name);
2337 if (r < 0)
2338 goto fail;
2339
2340 service = SERVICE(UNIT_DEREF(s->service));
2341 unit_ref_unset(&s->service);
2342
2343 s->n_accepted++;
2344 unit_choose_id(UNIT(service), name);
2345
2346 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2347 if (r < 0)
2348 goto fail;
2349
2350 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2351 s->n_connections++;
2352
2353 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2354
2355 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2356 if (r < 0) {
2357 /* We failed to activate the new service, but it still exists. Let's make sure the service
2358 * closes and forgets the connection fd again, immediately. */
2359 service_close_socket_fd(service);
2360 goto fail;
2361 }
2362
2363 /* Notify clients about changed counters */
2364 unit_add_to_dbus_queue(UNIT(s));
2365 }
2366
2367 return;
2368
2369 fail:
2370 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2371 cfd >= 0 ? "template" : "non-template",
2372 bus_error_message(&error, r));
2373
2374 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2375 safe_close(cfd);
2376 }
2377
2378 static void socket_run_next(Socket *s) {
2379 int r;
2380
2381 assert(s);
2382 assert(s->control_command);
2383 assert(s->control_command->command_next);
2384
2385 socket_unwatch_control_pid(s);
2386
2387 s->control_command = s->control_command->command_next;
2388
2389 r = socket_spawn(s, s->control_command, &s->control_pid);
2390 if (r < 0)
2391 goto fail;
2392
2393 return;
2394
2395 fail:
2396 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2397
2398 if (s->state == SOCKET_START_POST)
2399 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2400 else if (s->state == SOCKET_STOP_POST)
2401 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2402 else
2403 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2404 }
2405
2406 static int socket_start(Unit *u) {
2407 Socket *s = SOCKET(u);
2408 int r;
2409
2410 assert(s);
2411
2412 /* We cannot fulfill this request right now, try again later
2413 * please! */
2414 if (IN_SET(s->state,
2415 SOCKET_STOP_PRE,
2416 SOCKET_STOP_PRE_SIGKILL,
2417 SOCKET_STOP_PRE_SIGTERM,
2418 SOCKET_STOP_POST,
2419 SOCKET_FINAL_SIGTERM,
2420 SOCKET_FINAL_SIGKILL))
2421 return -EAGAIN;
2422
2423 /* Already on it! */
2424 if (IN_SET(s->state,
2425 SOCKET_START_PRE,
2426 SOCKET_START_CHOWN,
2427 SOCKET_START_POST))
2428 return 0;
2429
2430 /* Cannot run this without the service being around */
2431 if (UNIT_ISSET(s->service)) {
2432 Service *service;
2433
2434 service = SERVICE(UNIT_DEREF(s->service));
2435
2436 if (UNIT(service)->load_state != UNIT_LOADED) {
2437 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2438 return -ENOENT;
2439 }
2440
2441 /* If the service is already active we cannot start the
2442 * socket */
2443 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2444 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2445 return -EBUSY;
2446 }
2447 }
2448
2449 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2450
2451 r = unit_start_limit_test(u);
2452 if (r < 0) {
2453 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2454 return r;
2455 }
2456
2457 r = unit_acquire_invocation_id(u);
2458 if (r < 0)
2459 return r;
2460
2461 s->result = SOCKET_SUCCESS;
2462
2463 u->reset_accounting = true;
2464
2465 socket_enter_start_pre(s);
2466 return 1;
2467 }
2468
2469 static int socket_stop(Unit *u) {
2470 Socket *s = SOCKET(u);
2471
2472 assert(s);
2473
2474 /* Already on it */
2475 if (IN_SET(s->state,
2476 SOCKET_STOP_PRE,
2477 SOCKET_STOP_PRE_SIGTERM,
2478 SOCKET_STOP_PRE_SIGKILL,
2479 SOCKET_STOP_POST,
2480 SOCKET_FINAL_SIGTERM,
2481 SOCKET_FINAL_SIGKILL))
2482 return 0;
2483
2484 /* If there's already something running we go directly into
2485 * kill mode. */
2486 if (IN_SET(s->state,
2487 SOCKET_START_PRE,
2488 SOCKET_START_CHOWN,
2489 SOCKET_START_POST)) {
2490 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2491 return -EAGAIN;
2492 }
2493
2494 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2495
2496 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2497 return 1;
2498 }
2499
2500 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2501 Socket *s = SOCKET(u);
2502 SocketPort *p;
2503 int r;
2504
2505 assert(u);
2506 assert(f);
2507 assert(fds);
2508
2509 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2510 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2511 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2512
2513 if (s->control_pid > 0)
2514 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2515
2516 if (s->control_command_id >= 0)
2517 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2518
2519 LIST_FOREACH(port, p, s->ports) {
2520 int copy;
2521
2522 if (p->fd < 0)
2523 continue;
2524
2525 copy = fdset_put_dup(fds, p->fd);
2526 if (copy < 0)
2527 return copy;
2528
2529 if (p->type == SOCKET_SOCKET) {
2530 _cleanup_free_ char *t = NULL;
2531
2532 r = socket_address_print(&p->address, &t);
2533 if (r < 0)
2534 return r;
2535
2536 if (socket_address_family(&p->address) == AF_NETLINK)
2537 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2538 else
2539 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2540
2541 } else if (p->type == SOCKET_SPECIAL)
2542 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2543 else if (p->type == SOCKET_MQUEUE)
2544 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2545 else if (p->type == SOCKET_USB_FUNCTION)
2546 unit_serialize_item_format(u, f, "ffs", "%i %s", copy, p->path);
2547 else {
2548 assert(p->type == SOCKET_FIFO);
2549 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2550 }
2551 }
2552
2553 return 0;
2554 }
2555
2556 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
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, "control-pid")) {
2593 pid_t pid;
2594
2595 if (parse_pid(value, &pid) < 0)
2596 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2597 else
2598 s->control_pid = pid;
2599 } else if (streq(key, "control-command")) {
2600 SocketExecCommand id;
2601
2602 id = socket_exec_command_from_string(value);
2603 if (id < 0)
2604 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2605 else {
2606 s->control_command_id = id;
2607 s->control_command = s->exec_command[id];
2608 }
2609 } else if (streq(key, "fifo")) {
2610 int fd, skip = 0;
2611 SocketPort *p;
2612
2613 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2614 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2615 else
2616 LIST_FOREACH(port, p, s->ports)
2617 if (p->type == SOCKET_FIFO &&
2618 path_equal_or_files_same(p->path, value+skip, 0)) {
2619 socket_port_take_fd(p, fds, fd);
2620 break;
2621 }
2622
2623 } else if (streq(key, "special")) {
2624 int fd, skip = 0;
2625 SocketPort *p;
2626
2627 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2628 log_unit_debug(u, "Failed to parse special value: %s", value);
2629 else
2630 LIST_FOREACH(port, p, s->ports)
2631 if (p->type == SOCKET_SPECIAL &&
2632 path_equal_or_files_same(p->path, value+skip, 0)) {
2633 socket_port_take_fd(p, fds, fd);
2634 break;
2635 }
2636
2637 } else if (streq(key, "mqueue")) {
2638 int fd, skip = 0;
2639 SocketPort *p;
2640
2641 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2642 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2643 else
2644 LIST_FOREACH(port, p, s->ports)
2645 if (p->type == SOCKET_MQUEUE &&
2646 streq(p->path, value+skip)) {
2647 socket_port_take_fd(p, fds, fd);
2648 break;
2649 }
2650
2651 } else if (streq(key, "socket")) {
2652 int fd, type, skip = 0;
2653 SocketPort *p;
2654
2655 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2656 log_unit_debug(u, "Failed to parse socket value: %s", value);
2657 else
2658 LIST_FOREACH(port, p, s->ports)
2659 if (socket_address_is(&p->address, value+skip, type)) {
2660 socket_port_take_fd(p, fds, fd);
2661 break;
2662 }
2663
2664 } else if (streq(key, "netlink")) {
2665 int fd, skip = 0;
2666 SocketPort *p;
2667
2668 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2669 log_unit_debug(u, "Failed to parse socket value: %s", value);
2670 else
2671 LIST_FOREACH(port, p, s->ports)
2672 if (socket_address_is_netlink(&p->address, value+skip)) {
2673 socket_port_take_fd(p, fds, fd);
2674 break;
2675 }
2676
2677 } else if (streq(key, "ffs")) {
2678 int fd, skip = 0;
2679 SocketPort *p;
2680
2681 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2682 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2683 else
2684 LIST_FOREACH(port, p, s->ports)
2685 if (p->type == SOCKET_USB_FUNCTION &&
2686 path_equal_or_files_same(p->path, value+skip, 0)) {
2687 socket_port_take_fd(p, fds, fd);
2688 break;
2689 }
2690
2691 } else
2692 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2693
2694 return 0;
2695 }
2696
2697 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2698 Socket *s = SOCKET(u);
2699 SocketPort *p;
2700
2701 assert(u);
2702
2703 LIST_FOREACH(port, p, s->ports) {
2704 Iterator i;
2705 int fd;
2706
2707 if (p->type != SOCKET_SOCKET)
2708 continue;
2709
2710 if (p->fd >= 0)
2711 continue;
2712
2713 FDSET_FOREACH(fd, fds, i) {
2714 if (socket_address_matches_fd(&p->address, fd)) {
2715 p->fd = fdset_remove(fds, fd);
2716 s->deserialized_state = SOCKET_LISTENING;
2717 break;
2718 }
2719 }
2720 }
2721 }
2722
2723 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2724 assert(u);
2725
2726 return state_translation_table[SOCKET(u)->state];
2727 }
2728
2729 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2730 assert(u);
2731
2732 return socket_state_to_string(SOCKET(u)->state);
2733 }
2734
2735 const char* socket_port_type_to_string(SocketPort *p) {
2736
2737 assert(p);
2738
2739 switch (p->type) {
2740
2741 case SOCKET_SOCKET:
2742
2743 switch (p->address.type) {
2744
2745 case SOCK_STREAM:
2746 return "Stream";
2747
2748 case SOCK_DGRAM:
2749 return "Datagram";
2750
2751 case SOCK_SEQPACKET:
2752 return "SequentialPacket";
2753
2754 case SOCK_RAW:
2755 if (socket_address_family(&p->address) == AF_NETLINK)
2756 return "Netlink";
2757
2758 _fallthrough_;
2759 default:
2760 return NULL;
2761 }
2762
2763 case SOCKET_SPECIAL:
2764 return "Special";
2765
2766 case SOCKET_MQUEUE:
2767 return "MessageQueue";
2768
2769 case SOCKET_FIFO:
2770 return "FIFO";
2771
2772 case SOCKET_USB_FUNCTION:
2773 return "USBFunction";
2774
2775 default:
2776 return NULL;
2777 }
2778 }
2779
2780 SocketType socket_port_type_from_string(const char *s) {
2781 assert(s);
2782
2783 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2784 return SOCKET_SOCKET;
2785 else if (streq(s, "Special"))
2786 return SOCKET_SPECIAL;
2787 else if (streq(s, "MessageQueue"))
2788 return SOCKET_MQUEUE;
2789 else if (streq(s, "FIFO"))
2790 return SOCKET_FIFO;
2791 else if (streq(s, "USBFunction"))
2792 return SOCKET_USB_FUNCTION;
2793 else
2794 return _SOCKET_TYPE_INVALID;
2795 }
2796
2797 _pure_ static bool socket_may_gc(Unit *u) {
2798 Socket *s = SOCKET(u);
2799
2800 assert(u);
2801
2802 return s->n_connections == 0;
2803 }
2804
2805 static int socket_accept_do(Socket *s, int fd) {
2806 int cfd;
2807
2808 assert(s);
2809 assert(fd >= 0);
2810
2811 for (;;) {
2812 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2813 if (cfd < 0) {
2814 if (errno == EINTR)
2815 continue;
2816
2817 return -errno;
2818 }
2819
2820 break;
2821 }
2822
2823 return cfd;
2824 }
2825
2826 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2827 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2828 int cfd, r;
2829 pid_t pid;
2830
2831 assert(s);
2832 assert(p);
2833 assert(fd >= 0);
2834
2835 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2836 * connection socket is also properly associated with the cgroup. */
2837
2838 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2839 goto shortcut;
2840
2841 r = bpf_firewall_supported();
2842 if (r < 0)
2843 return r;
2844 if (r == BPF_FIREWALL_UNSUPPORTED)
2845 goto shortcut;
2846
2847 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2848 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2849
2850 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2851 if (r < 0)
2852 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2853 if (r == 0) {
2854 /* Child */
2855
2856 pair[0] = safe_close(pair[0]);
2857
2858 cfd = socket_accept_do(s, fd);
2859 if (cfd < 0) {
2860 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2861 _exit(EXIT_FAILURE);
2862 }
2863
2864 r = send_one_fd(pair[1], cfd, 0);
2865 if (r < 0) {
2866 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2867 _exit(EXIT_FAILURE);
2868 }
2869
2870 _exit(EXIT_SUCCESS);
2871 }
2872
2873 pair[1] = safe_close(pair[1]);
2874 cfd = receive_one_fd(pair[0], 0);
2875
2876 /* We synchronously wait for the helper, as it shouldn't be slow */
2877 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2878 if (r < 0) {
2879 safe_close(cfd);
2880 return r;
2881 }
2882
2883 if (cfd < 0)
2884 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2885
2886 return cfd;
2887
2888 shortcut:
2889 cfd = socket_accept_do(s, fd);
2890 if (cfd < 0)
2891 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2892
2893 return cfd;
2894 }
2895
2896 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2897 SocketPort *p = userdata;
2898 int cfd = -1;
2899
2900 assert(p);
2901 assert(fd >= 0);
2902
2903 if (p->socket->state != SOCKET_LISTENING)
2904 return 0;
2905
2906 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2907
2908 if (revents != EPOLLIN) {
2909
2910 if (revents & EPOLLHUP)
2911 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.");
2912 else
2913 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2914 goto fail;
2915 }
2916
2917 if (p->socket->accept &&
2918 p->type == SOCKET_SOCKET &&
2919 socket_address_can_accept(&p->address)) {
2920
2921 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2922 if (cfd < 0)
2923 goto fail;
2924
2925 socket_apply_socket_options(p->socket, cfd);
2926 }
2927
2928 socket_enter_running(p->socket, cfd);
2929 return 0;
2930
2931 fail:
2932 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2933 return 0;
2934 }
2935
2936 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2937 Socket *s = SOCKET(u);
2938 SocketResult f;
2939
2940 assert(s);
2941 assert(pid >= 0);
2942
2943 if (pid != s->control_pid)
2944 return;
2945
2946 s->control_pid = 0;
2947
2948 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2949 f = SOCKET_SUCCESS;
2950 else if (code == CLD_EXITED)
2951 f = SOCKET_FAILURE_EXIT_CODE;
2952 else if (code == CLD_KILLED)
2953 f = SOCKET_FAILURE_SIGNAL;
2954 else if (code == CLD_DUMPED)
2955 f = SOCKET_FAILURE_CORE_DUMP;
2956 else
2957 assert_not_reached("Unknown sigchld code");
2958
2959 if (s->control_command) {
2960 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2961
2962 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2963 f = SOCKET_SUCCESS;
2964 }
2965
2966 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2967 "Control process exited, code=%s status=%i",
2968 sigchld_code_to_string(code), status);
2969
2970 if (s->result == SOCKET_SUCCESS)
2971 s->result = f;
2972
2973 if (s->control_command &&
2974 s->control_command->command_next &&
2975 f == SOCKET_SUCCESS) {
2976
2977 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2978 socket_run_next(s);
2979 } else {
2980 s->control_command = NULL;
2981 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2982
2983 /* No further commands for this step, so let's figure
2984 * out what to do next */
2985
2986 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2987
2988 switch (s->state) {
2989
2990 case SOCKET_START_PRE:
2991 if (f == SOCKET_SUCCESS)
2992 socket_enter_start_chown(s);
2993 else
2994 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2995 break;
2996
2997 case SOCKET_START_CHOWN:
2998 if (f == SOCKET_SUCCESS)
2999 socket_enter_start_post(s);
3000 else
3001 socket_enter_stop_pre(s, f);
3002 break;
3003
3004 case SOCKET_START_POST:
3005 if (f == SOCKET_SUCCESS)
3006 socket_enter_listening(s);
3007 else
3008 socket_enter_stop_pre(s, f);
3009 break;
3010
3011 case SOCKET_STOP_PRE:
3012 case SOCKET_STOP_PRE_SIGTERM:
3013 case SOCKET_STOP_PRE_SIGKILL:
3014 socket_enter_stop_post(s, f);
3015 break;
3016
3017 case SOCKET_STOP_POST:
3018 case SOCKET_FINAL_SIGTERM:
3019 case SOCKET_FINAL_SIGKILL:
3020 socket_enter_dead(s, f);
3021 break;
3022
3023 default:
3024 assert_not_reached("Uh, control process died at wrong time.");
3025 }
3026 }
3027
3028 /* Notify clients about changed exit status */
3029 unit_add_to_dbus_queue(u);
3030 }
3031
3032 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3033 Socket *s = SOCKET(userdata);
3034
3035 assert(s);
3036 assert(s->timer_event_source == source);
3037
3038 switch (s->state) {
3039
3040 case SOCKET_START_PRE:
3041 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3042 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3043 break;
3044
3045 case SOCKET_START_CHOWN:
3046 case SOCKET_START_POST:
3047 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3048 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3049 break;
3050
3051 case SOCKET_STOP_PRE:
3052 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3053 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3054 break;
3055
3056 case SOCKET_STOP_PRE_SIGTERM:
3057 if (s->kill_context.send_sigkill) {
3058 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3059 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3060 } else {
3061 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3062 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3063 }
3064 break;
3065
3066 case SOCKET_STOP_PRE_SIGKILL:
3067 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3068 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3069 break;
3070
3071 case SOCKET_STOP_POST:
3072 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3073 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3074 break;
3075
3076 case SOCKET_FINAL_SIGTERM:
3077 if (s->kill_context.send_sigkill) {
3078 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3079 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3080 } else {
3081 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3082 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3083 }
3084 break;
3085
3086 case SOCKET_FINAL_SIGKILL:
3087 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3088 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3089 break;
3090
3091 default:
3092 assert_not_reached("Timeout at wrong time.");
3093 }
3094
3095 return 0;
3096 }
3097
3098 int socket_collect_fds(Socket *s, int **fds) {
3099 size_t k = 0, n = 0;
3100 SocketPort *p;
3101 int *rfds;
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 size_t 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 (int) 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.