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Merge pull request #9811 from poettering/random-seed-tweaks
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <signal.h>
9 #include <sys/epoll.h>
10 #include <sys/stat.h>
11 #include <unistd.h>
12 #include <linux/sctp.h>
13
14 #include "alloc-util.h"
15 #include "bpf-firewall.h"
16 #include "bus-error.h"
17 #include "bus-util.h"
18 #include "copy.h"
19 #include "dbus-socket.h"
20 #include "def.h"
21 #include "exit-status.h"
22 #include "fd-util.h"
23 #include "format-util.h"
24 #include "fs-util.h"
25 #include "in-addr-util.h"
26 #include "io-util.h"
27 #include "label.h"
28 #include "log.h"
29 #include "missing.h"
30 #include "mkdir.h"
31 #include "parse-util.h"
32 #include "path-util.h"
33 #include "process-util.h"
34 #include "selinux-util.h"
35 #include "signal-util.h"
36 #include "smack-util.h"
37 #include "socket.h"
38 #include "socket-protocol-list.h"
39 #include "special.h"
40 #include "string-table.h"
41 #include "string-util.h"
42 #include "strv.h"
43 #include "unit-name.h"
44 #include "unit.h"
45 #include "user-util.h"
46
47 struct SocketPeer {
48 unsigned n_ref;
49
50 Socket *socket;
51 union sockaddr_union peer;
52 socklen_t peer_salen;
53 };
54
55 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
56 [SOCKET_DEAD] = UNIT_INACTIVE,
57 [SOCKET_START_PRE] = UNIT_ACTIVATING,
58 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
59 [SOCKET_START_POST] = UNIT_ACTIVATING,
60 [SOCKET_LISTENING] = UNIT_ACTIVE,
61 [SOCKET_RUNNING] = UNIT_ACTIVE,
62 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
63 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
64 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
65 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
66 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_FAILED] = UNIT_FAILED
69 };
70
71 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
72 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
73
74 static void socket_init(Unit *u) {
75 Socket *s = SOCKET(u);
76
77 assert(u);
78 assert(u->load_state == UNIT_STUB);
79
80 s->backlog = SOMAXCONN;
81 s->timeout_usec = u->manager->default_timeout_start_usec;
82 s->directory_mode = 0755;
83 s->socket_mode = 0666;
84
85 s->max_connections = 64;
86
87 s->priority = -1;
88 s->ip_tos = -1;
89 s->ip_ttl = -1;
90 s->mark = -1;
91
92 s->exec_context.std_output = u->manager->default_std_output;
93 s->exec_context.std_error = u->manager->default_std_error;
94
95 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
96
97 s->trigger_limit.interval = USEC_INFINITY;
98 s->trigger_limit.burst = (unsigned) -1;
99 }
100
101 static void socket_unwatch_control_pid(Socket *s) {
102 assert(s);
103
104 if (s->control_pid <= 0)
105 return;
106
107 unit_unwatch_pid(UNIT(s), s->control_pid);
108 s->control_pid = 0;
109 }
110
111 static void socket_cleanup_fd_list(SocketPort *p) {
112 assert(p);
113
114 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
115 p->auxiliary_fds = mfree(p->auxiliary_fds);
116 p->n_auxiliary_fds = 0;
117 }
118
119 void socket_free_ports(Socket *s) {
120 SocketPort *p;
121
122 assert(s);
123
124 while ((p = s->ports)) {
125 LIST_REMOVE(port, s->ports, p);
126
127 sd_event_source_unref(p->event_source);
128
129 socket_cleanup_fd_list(p);
130 safe_close(p->fd);
131 free(p->path);
132 free(p);
133 }
134 }
135
136 static void socket_done(Unit *u) {
137 Socket *s = SOCKET(u);
138 SocketPeer *p;
139
140 assert(s);
141
142 socket_free_ports(s);
143
144 while ((p = set_steal_first(s->peers_by_address)))
145 p->socket = NULL;
146
147 s->peers_by_address = set_free(s->peers_by_address);
148
149 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
150 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
151 s->control_command = NULL;
152
153 dynamic_creds_unref(&s->dynamic_creds);
154
155 socket_unwatch_control_pid(s);
156
157 unit_ref_unset(&s->service);
158
159 s->tcp_congestion = mfree(s->tcp_congestion);
160 s->bind_to_device = mfree(s->bind_to_device);
161
162 s->smack = mfree(s->smack);
163 s->smack_ip_in = mfree(s->smack_ip_in);
164 s->smack_ip_out = mfree(s->smack_ip_out);
165
166 strv_free(s->symlinks);
167
168 s->user = mfree(s->user);
169 s->group = mfree(s->group);
170
171 s->fdname = mfree(s->fdname);
172
173 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
174 }
175
176 static int socket_arm_timer(Socket *s, usec_t usec) {
177 int r;
178
179 assert(s);
180
181 if (s->timer_event_source) {
182 r = sd_event_source_set_time(s->timer_event_source, usec);
183 if (r < 0)
184 return r;
185
186 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
187 }
188
189 if (usec == USEC_INFINITY)
190 return 0;
191
192 r = sd_event_add_time(
193 UNIT(s)->manager->event,
194 &s->timer_event_source,
195 CLOCK_MONOTONIC,
196 usec, 0,
197 socket_dispatch_timer, s);
198 if (r < 0)
199 return r;
200
201 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
202
203 return 0;
204 }
205
206 int socket_instantiate_service(Socket *s) {
207 _cleanup_free_ char *prefix = NULL, *name = NULL;
208 int r;
209 Unit *u;
210
211 assert(s);
212
213 /* This fills in s->service if it isn't filled in yet. For
214 * Accept=yes sockets we create the next connection service
215 * here. For Accept=no this is mostly a NOP since the service
216 * is figured out at load time anyway. */
217
218 if (UNIT_DEREF(s->service))
219 return 0;
220
221 if (!s->accept)
222 return 0;
223
224 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
225 if (r < 0)
226 return r;
227
228 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
229 return -ENOMEM;
230
231 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
232 if (r < 0)
233 return r;
234
235 unit_ref_set(&s->service, UNIT(s), u);
236
237 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
238 }
239
240 static bool have_non_accept_socket(Socket *s) {
241 SocketPort *p;
242
243 assert(s);
244
245 if (!s->accept)
246 return true;
247
248 LIST_FOREACH(port, p, s->ports) {
249
250 if (p->type != SOCKET_SOCKET)
251 return true;
252
253 if (!socket_address_can_accept(&p->address))
254 return true;
255 }
256
257 return false;
258 }
259
260 static int socket_add_mount_dependencies(Socket *s) {
261 SocketPort *p;
262 int r;
263
264 assert(s);
265
266 LIST_FOREACH(port, p, s->ports) {
267 const char *path = NULL;
268
269 if (p->type == SOCKET_SOCKET)
270 path = socket_address_get_path(&p->address);
271 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
272 path = p->path;
273
274 if (!path)
275 continue;
276
277 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
278 if (r < 0)
279 return r;
280 }
281
282 return 0;
283 }
284
285 static int socket_add_device_dependencies(Socket *s) {
286 char *t;
287
288 assert(s);
289
290 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
291 return 0;
292
293 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
294 return unit_add_node_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
295 }
296
297 static int socket_add_default_dependencies(Socket *s) {
298 int r;
299 assert(s);
300
301 if (!UNIT(s)->default_dependencies)
302 return 0;
303
304 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
305 if (r < 0)
306 return r;
307
308 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
309 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
310 if (r < 0)
311 return r;
312 }
313
314 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
315 }
316
317 _pure_ static bool socket_has_exec(Socket *s) {
318 unsigned i;
319 assert(s);
320
321 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
322 if (s->exec_command[i])
323 return true;
324
325 return false;
326 }
327
328 static int socket_add_extras(Socket *s) {
329 Unit *u = UNIT(s);
330 int r;
331
332 assert(s);
333
334 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
335 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
336 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
337 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
338 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
339 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
340 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
341 * service starts are typical. */
342
343 if (s->trigger_limit.interval == USEC_INFINITY)
344 s->trigger_limit.interval = 2 * USEC_PER_SEC;
345
346 if (s->trigger_limit.burst == (unsigned) -1) {
347 if (s->accept)
348 s->trigger_limit.burst = 200;
349 else
350 s->trigger_limit.burst = 20;
351 }
352
353 if (have_non_accept_socket(s)) {
354
355 if (!UNIT_DEREF(s->service)) {
356 Unit *x;
357
358 r = unit_load_related_unit(u, ".service", &x);
359 if (r < 0)
360 return r;
361
362 unit_ref_set(&s->service, u, x);
363 }
364
365 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
366 if (r < 0)
367 return r;
368 }
369
370 r = socket_add_mount_dependencies(s);
371 if (r < 0)
372 return r;
373
374 r = socket_add_device_dependencies(s);
375 if (r < 0)
376 return r;
377
378 r = unit_patch_contexts(u);
379 if (r < 0)
380 return r;
381
382 if (socket_has_exec(s)) {
383 r = unit_add_exec_dependencies(u, &s->exec_context);
384 if (r < 0)
385 return r;
386 }
387
388 r = unit_set_default_slice(u);
389 if (r < 0)
390 return r;
391
392 r = socket_add_default_dependencies(s);
393 if (r < 0)
394 return r;
395
396 return 0;
397 }
398
399 static const char *socket_find_symlink_target(Socket *s) {
400 const char *found = NULL;
401 SocketPort *p;
402
403 LIST_FOREACH(port, p, s->ports) {
404 const char *f = NULL;
405
406 switch (p->type) {
407
408 case SOCKET_FIFO:
409 f = p->path;
410 break;
411
412 case SOCKET_SOCKET:
413 f = socket_address_get_path(&p->address);
414 break;
415
416 default:
417 break;
418 }
419
420 if (f) {
421 if (found)
422 return NULL;
423
424 found = f;
425 }
426 }
427
428 return found;
429 }
430
431 static int socket_verify(Socket *s) {
432 assert(s);
433
434 if (UNIT(s)->load_state != UNIT_LOADED)
435 return 0;
436
437 if (!s->ports) {
438 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
439 return -ENOEXEC;
440 }
441
442 if (s->accept && have_non_accept_socket(s)) {
443 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
444 return -ENOEXEC;
445 }
446
447 if (s->accept && s->max_connections <= 0) {
448 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
449 return -ENOEXEC;
450 }
451
452 if (s->accept && UNIT_DEREF(s->service)) {
453 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
454 return -ENOEXEC;
455 }
456
457 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
458 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
459 return -ENOEXEC;
460 }
461
462 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
463 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
464 return -ENOEXEC;
465 }
466
467 return 0;
468 }
469
470 static void peer_address_hash_func(const void *p, struct siphash *state) {
471 const SocketPeer *s = p;
472
473 assert(s);
474
475 if (s->peer.sa.sa_family == AF_INET)
476 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
477 else if (s->peer.sa.sa_family == AF_INET6)
478 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
479 else if (s->peer.sa.sa_family == AF_VSOCK)
480 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
481 else
482 assert_not_reached("Unknown address family.");
483 }
484
485 static int peer_address_compare_func(const void *a, const void *b) {
486 const SocketPeer *x = a, *y = b;
487 int r;
488
489 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
490 if (r != 0)
491 return r;
492
493 switch(x->peer.sa.sa_family) {
494 case AF_INET:
495 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
496 case AF_INET6:
497 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
498 case AF_VSOCK:
499 if (x->peer.vm.svm_cid < y->peer.vm.svm_cid)
500 return -1;
501 if (x->peer.vm.svm_cid > y->peer.vm.svm_cid)
502 return 1;
503 return 0;
504 }
505 assert_not_reached("Black sheep in the family!");
506 }
507
508 const struct hash_ops peer_address_hash_ops = {
509 .hash = peer_address_hash_func,
510 .compare = peer_address_compare_func
511 };
512
513 static int socket_load(Unit *u) {
514 Socket *s = SOCKET(u);
515 int r;
516
517 assert(u);
518 assert(u->load_state == UNIT_STUB);
519
520 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
521 if (r < 0)
522 return r;
523
524 r = unit_load_fragment_and_dropin(u);
525 if (r < 0)
526 return r;
527
528 if (u->load_state == UNIT_LOADED) {
529 /* This is a new unit? Then let's add in some extras */
530 r = socket_add_extras(s);
531 if (r < 0)
532 return r;
533 }
534
535 return socket_verify(s);
536 }
537
538 static SocketPeer *socket_peer_new(void) {
539 SocketPeer *p;
540
541 p = new0(SocketPeer, 1);
542 if (!p)
543 return NULL;
544
545 p->n_ref = 1;
546
547 return p;
548 }
549
550 SocketPeer *socket_peer_ref(SocketPeer *p) {
551 if (!p)
552 return NULL;
553
554 assert(p->n_ref > 0);
555 p->n_ref++;
556
557 return p;
558 }
559
560 SocketPeer *socket_peer_unref(SocketPeer *p) {
561 if (!p)
562 return NULL;
563
564 assert(p->n_ref > 0);
565
566 p->n_ref--;
567
568 if (p->n_ref > 0)
569 return NULL;
570
571 if (p->socket)
572 set_remove(p->socket->peers_by_address, p);
573
574 return mfree(p);
575 }
576
577 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
578 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
579 SocketPeer sa = {}, *i;
580 socklen_t salen = sizeof(sa.peer);
581 int r;
582
583 assert(fd >= 0);
584 assert(s);
585
586 r = getpeername(fd, &sa.peer.sa, &salen);
587 if (r < 0)
588 return log_error_errno(errno, "getpeername failed: %m");
589
590 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
591 *p = NULL;
592 return 0;
593 }
594
595 i = set_get(s->peers_by_address, &sa);
596 if (i) {
597 *p = socket_peer_ref(i);
598 return 1;
599 }
600
601 remote = socket_peer_new();
602 if (!remote)
603 return log_oom();
604
605 remote->peer = sa.peer;
606 remote->peer_salen = salen;
607
608 r = set_put(s->peers_by_address, remote);
609 if (r < 0)
610 return r;
611
612 remote->socket = s;
613
614 *p = TAKE_PTR(remote);
615
616 return 1;
617 }
618
619 _const_ static const char* listen_lookup(int family, int type) {
620
621 if (family == AF_NETLINK)
622 return "ListenNetlink";
623
624 if (type == SOCK_STREAM)
625 return "ListenStream";
626 else if (type == SOCK_DGRAM)
627 return "ListenDatagram";
628 else if (type == SOCK_SEQPACKET)
629 return "ListenSequentialPacket";
630
631 assert_not_reached("Unknown socket type");
632 return NULL;
633 }
634
635 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
636 char time_string[FORMAT_TIMESPAN_MAX];
637 SocketExecCommand c;
638 Socket *s = SOCKET(u);
639 SocketPort *p;
640 const char *prefix2, *str;
641
642 assert(s);
643 assert(f);
644
645 prefix = strempty(prefix);
646 prefix2 = strjoina(prefix, "\t");
647
648 fprintf(f,
649 "%sSocket State: %s\n"
650 "%sResult: %s\n"
651 "%sBindIPv6Only: %s\n"
652 "%sBacklog: %u\n"
653 "%sSocketMode: %04o\n"
654 "%sDirectoryMode: %04o\n"
655 "%sKeepAlive: %s\n"
656 "%sNoDelay: %s\n"
657 "%sFreeBind: %s\n"
658 "%sTransparent: %s\n"
659 "%sBroadcast: %s\n"
660 "%sPassCredentials: %s\n"
661 "%sPassSecurity: %s\n"
662 "%sTCPCongestion: %s\n"
663 "%sRemoveOnStop: %s\n"
664 "%sWritable: %s\n"
665 "%sFileDescriptorName: %s\n"
666 "%sSELinuxContextFromNet: %s\n",
667 prefix, socket_state_to_string(s->state),
668 prefix, socket_result_to_string(s->result),
669 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
670 prefix, s->backlog,
671 prefix, s->socket_mode,
672 prefix, s->directory_mode,
673 prefix, yes_no(s->keep_alive),
674 prefix, yes_no(s->no_delay),
675 prefix, yes_no(s->free_bind),
676 prefix, yes_no(s->transparent),
677 prefix, yes_no(s->broadcast),
678 prefix, yes_no(s->pass_cred),
679 prefix, yes_no(s->pass_sec),
680 prefix, strna(s->tcp_congestion),
681 prefix, yes_no(s->remove_on_stop),
682 prefix, yes_no(s->writable),
683 prefix, socket_fdname(s),
684 prefix, yes_no(s->selinux_context_from_net));
685
686 if (s->control_pid > 0)
687 fprintf(f,
688 "%sControl PID: "PID_FMT"\n",
689 prefix, s->control_pid);
690
691 if (s->bind_to_device)
692 fprintf(f,
693 "%sBindToDevice: %s\n",
694 prefix, s->bind_to_device);
695
696 if (s->accept)
697 fprintf(f,
698 "%sAccepted: %u\n"
699 "%sNConnections: %u\n"
700 "%sMaxConnections: %u\n"
701 "%sMaxConnectionsPerSource: %u\n",
702 prefix, s->n_accepted,
703 prefix, s->n_connections,
704 prefix, s->max_connections,
705 prefix, s->max_connections_per_source);
706
707 if (s->priority >= 0)
708 fprintf(f,
709 "%sPriority: %i\n",
710 prefix, s->priority);
711
712 if (s->receive_buffer > 0)
713 fprintf(f,
714 "%sReceiveBuffer: %zu\n",
715 prefix, s->receive_buffer);
716
717 if (s->send_buffer > 0)
718 fprintf(f,
719 "%sSendBuffer: %zu\n",
720 prefix, s->send_buffer);
721
722 if (s->ip_tos >= 0)
723 fprintf(f,
724 "%sIPTOS: %i\n",
725 prefix, s->ip_tos);
726
727 if (s->ip_ttl >= 0)
728 fprintf(f,
729 "%sIPTTL: %i\n",
730 prefix, s->ip_ttl);
731
732 if (s->pipe_size > 0)
733 fprintf(f,
734 "%sPipeSize: %zu\n",
735 prefix, s->pipe_size);
736
737 if (s->mark >= 0)
738 fprintf(f,
739 "%sMark: %i\n",
740 prefix, s->mark);
741
742 if (s->mq_maxmsg > 0)
743 fprintf(f,
744 "%sMessageQueueMaxMessages: %li\n",
745 prefix, s->mq_maxmsg);
746
747 if (s->mq_msgsize > 0)
748 fprintf(f,
749 "%sMessageQueueMessageSize: %li\n",
750 prefix, s->mq_msgsize);
751
752 if (s->reuse_port)
753 fprintf(f,
754 "%sReusePort: %s\n",
755 prefix, yes_no(s->reuse_port));
756
757 if (s->smack)
758 fprintf(f,
759 "%sSmackLabel: %s\n",
760 prefix, s->smack);
761
762 if (s->smack_ip_in)
763 fprintf(f,
764 "%sSmackLabelIPIn: %s\n",
765 prefix, s->smack_ip_in);
766
767 if (s->smack_ip_out)
768 fprintf(f,
769 "%sSmackLabelIPOut: %s\n",
770 prefix, s->smack_ip_out);
771
772 if (!isempty(s->user) || !isempty(s->group))
773 fprintf(f,
774 "%sSocketUser: %s\n"
775 "%sSocketGroup: %s\n",
776 prefix, strna(s->user),
777 prefix, strna(s->group));
778
779 if (s->keep_alive_time > 0)
780 fprintf(f,
781 "%sKeepAliveTimeSec: %s\n",
782 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
783
784 if (s->keep_alive_interval > 0)
785 fprintf(f,
786 "%sKeepAliveIntervalSec: %s\n",
787 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
788
789 if (s->keep_alive_cnt > 0)
790 fprintf(f,
791 "%sKeepAliveProbes: %u\n",
792 prefix, s->keep_alive_cnt);
793
794 if (s->defer_accept > 0)
795 fprintf(f,
796 "%sDeferAcceptSec: %s\n",
797 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
798
799 LIST_FOREACH(port, p, s->ports) {
800
801 switch (p->type) {
802 case SOCKET_SOCKET: {
803 _cleanup_free_ char *k = NULL;
804 const char *t;
805 int r;
806
807 r = socket_address_print(&p->address, &k);
808 if (r < 0)
809 t = strerror(-r);
810 else
811 t = k;
812
813 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
814 break;
815 }
816 case SOCKET_SPECIAL:
817 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
818 break;
819 case SOCKET_USB_FUNCTION:
820 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
821 break;
822 case SOCKET_MQUEUE:
823 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
824 break;
825 default:
826 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
827 }
828 }
829
830 fprintf(f,
831 "%sTriggerLimitIntervalSec: %s\n"
832 "%sTriggerLimitBurst: %u\n",
833 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
834 prefix, s->trigger_limit.burst);
835
836 str = socket_protocol_to_name(s->socket_protocol);
837 if (str)
838 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
839
840 if (!strv_isempty(s->symlinks)) {
841 char **q;
842
843 fprintf(f, "%sSymlinks:", prefix);
844 STRV_FOREACH(q, s->symlinks)
845 fprintf(f, " %s", *q);
846
847 fprintf(f, "\n");
848 }
849
850 fprintf(f,
851 "%sTimeoutSec: %s\n",
852 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
853
854 exec_context_dump(&s->exec_context, f, prefix);
855 kill_context_dump(&s->kill_context, f, prefix);
856
857 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
858 if (!s->exec_command[c])
859 continue;
860
861 fprintf(f, "%s-> %s:\n",
862 prefix, socket_exec_command_to_string(c));
863
864 exec_command_dump_list(s->exec_command[c], f, prefix2);
865 }
866
867 cgroup_context_dump(&s->cgroup_context, f, prefix);
868 }
869
870 static int instance_from_socket(int fd, unsigned nr, char **instance) {
871 socklen_t l;
872 char *r;
873 union sockaddr_union local, remote;
874
875 assert(fd >= 0);
876 assert(instance);
877
878 l = sizeof(local);
879 if (getsockname(fd, &local.sa, &l) < 0)
880 return -errno;
881
882 l = sizeof(remote);
883 if (getpeername(fd, &remote.sa, &l) < 0)
884 return -errno;
885
886 switch (local.sa.sa_family) {
887
888 case AF_INET: {
889 uint32_t
890 a = be32toh(local.in.sin_addr.s_addr),
891 b = be32toh(remote.in.sin_addr.s_addr);
892
893 if (asprintf(&r,
894 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
895 nr,
896 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
897 be16toh(local.in.sin_port),
898 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
899 be16toh(remote.in.sin_port)) < 0)
900 return -ENOMEM;
901
902 break;
903 }
904
905 case AF_INET6: {
906 static const unsigned char ipv4_prefix[] = {
907 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
908 };
909
910 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
911 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
912 const uint8_t
913 *a = local.in6.sin6_addr.s6_addr+12,
914 *b = remote.in6.sin6_addr.s6_addr+12;
915
916 if (asprintf(&r,
917 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
918 nr,
919 a[0], a[1], a[2], a[3],
920 be16toh(local.in6.sin6_port),
921 b[0], b[1], b[2], b[3],
922 be16toh(remote.in6.sin6_port)) < 0)
923 return -ENOMEM;
924 } else {
925 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
926
927 if (asprintf(&r,
928 "%u-%s:%u-%s:%u",
929 nr,
930 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
931 be16toh(local.in6.sin6_port),
932 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
933 be16toh(remote.in6.sin6_port)) < 0)
934 return -ENOMEM;
935 }
936
937 break;
938 }
939
940 case AF_UNIX: {
941 struct ucred ucred;
942 int k;
943
944 k = getpeercred(fd, &ucred);
945 if (k >= 0) {
946 if (asprintf(&r,
947 "%u-"PID_FMT"-"UID_FMT,
948 nr, ucred.pid, ucred.uid) < 0)
949 return -ENOMEM;
950 } else if (k == -ENODATA) {
951 /* This handles the case where somebody is
952 * connecting from another pid/uid namespace
953 * (e.g. from outside of our container). */
954 if (asprintf(&r,
955 "%u-unknown",
956 nr) < 0)
957 return -ENOMEM;
958 } else
959 return k;
960
961 break;
962 }
963
964 case AF_VSOCK:
965 if (asprintf(&r,
966 "%u-%u:%u-%u:%u",
967 nr,
968 local.vm.svm_cid, local.vm.svm_port,
969 remote.vm.svm_cid, remote.vm.svm_port) < 0)
970 return -ENOMEM;
971
972 break;
973
974 default:
975 assert_not_reached("Unhandled socket type.");
976 }
977
978 *instance = r;
979 return 0;
980 }
981
982 static void socket_close_fds(Socket *s) {
983 SocketPort *p;
984 char **i;
985
986 assert(s);
987
988 LIST_FOREACH(port, p, s->ports) {
989 bool was_open;
990
991 was_open = p->fd >= 0;
992
993 p->event_source = sd_event_source_unref(p->event_source);
994 p->fd = safe_close(p->fd);
995 socket_cleanup_fd_list(p);
996
997 /* One little note: we should normally not delete any sockets in the file system here! After all some
998 * other process we spawned might still have a reference of this fd and wants to continue to use
999 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
1000 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
1001 * anyway, but only then. */
1002
1003 if (!was_open || !s->remove_on_stop)
1004 continue;
1005
1006 switch (p->type) {
1007
1008 case SOCKET_FIFO:
1009 (void) unlink(p->path);
1010 break;
1011
1012 case SOCKET_MQUEUE:
1013 (void) mq_unlink(p->path);
1014 break;
1015
1016 case SOCKET_SOCKET:
1017 (void) socket_address_unlink(&p->address);
1018 break;
1019
1020 default:
1021 break;
1022 }
1023 }
1024
1025 if (s->remove_on_stop)
1026 STRV_FOREACH(i, s->symlinks)
1027 (void) unlink(*i);
1028 }
1029
1030 static void socket_apply_socket_options(Socket *s, int fd) {
1031 int r;
1032
1033 assert(s);
1034 assert(fd >= 0);
1035
1036 if (s->keep_alive) {
1037 int one = 1;
1038 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)) < 0)
1039 log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
1040 }
1041
1042 if (s->keep_alive_time > 0) {
1043 int value = s->keep_alive_time / USEC_PER_SEC;
1044 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
1045 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m");
1046 }
1047
1048 if (s->keep_alive_interval > 0) {
1049 int value = s->keep_alive_interval / USEC_PER_SEC;
1050 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
1051 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m");
1052 }
1053
1054 if (s->keep_alive_cnt > 0) {
1055 int value = s->keep_alive_cnt;
1056 if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
1057 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
1058 }
1059
1060 if (s->defer_accept > 0) {
1061 int value = s->defer_accept / USEC_PER_SEC;
1062 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
1063 log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m");
1064 }
1065
1066 if (s->no_delay) {
1067 int one = 1;
1068
1069 if (s->socket_protocol == IPPROTO_SCTP) {
1070 if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &one, sizeof(one)) < 0)
1071 log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
1072 } else {
1073 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one)) < 0)
1074 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
1075 }
1076 }
1077
1078 if (s->broadcast) {
1079 int one = 1;
1080 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
1081 log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
1082 }
1083
1084 if (s->pass_cred) {
1085 int one = 1;
1086 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
1087 log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
1088 }
1089
1090 if (s->pass_sec) {
1091 int one = 1;
1092 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
1093 log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
1094 }
1095
1096 if (s->priority >= 0)
1097 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
1098 log_unit_warning_errno(UNIT(s), errno, "SO_PRIORITY failed: %m");
1099
1100 if (s->receive_buffer > 0) {
1101 int value = (int) s->receive_buffer;
1102
1103 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
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_simplify(ep, false);
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], 0);
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 .exec_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 r = exec_spawn(UNIT(s),
1894 c,
1895 &s->exec_context,
1896 &exec_params,
1897 s->exec_runtime,
1898 &s->dynamic_creds,
1899 &pid);
1900 if (r < 0)
1901 return r;
1902
1903 r = unit_watch_pid(UNIT(s), pid);
1904 if (r < 0)
1905 /* FIXME: we need to do something here */
1906 return r;
1907
1908 *_pid = pid;
1909
1910 return 0;
1911 }
1912
1913 static int socket_chown(Socket *s, pid_t *_pid) {
1914 pid_t pid;
1915 int r;
1916
1917 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1918 if (r < 0)
1919 goto fail;
1920
1921 /* We have to resolve the user names out-of-process, hence
1922 * let's fork here. It's messy, but well, what can we do? */
1923
1924 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1925 if (r < 0)
1926 return r;
1927 if (r == 0) {
1928 uid_t uid = UID_INVALID;
1929 gid_t gid = GID_INVALID;
1930 SocketPort *p;
1931
1932 /* Child */
1933
1934 if (!isempty(s->user)) {
1935 const char *user = s->user;
1936
1937 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1938 if (r < 0) {
1939 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1940 _exit(EXIT_USER);
1941 }
1942 }
1943
1944 if (!isempty(s->group)) {
1945 const char *group = s->group;
1946
1947 r = get_group_creds(&group, &gid);
1948 if (r < 0) {
1949 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1950 _exit(EXIT_GROUP);
1951 }
1952 }
1953
1954 LIST_FOREACH(port, p, s->ports) {
1955 const char *path = NULL;
1956
1957 if (p->type == SOCKET_SOCKET)
1958 path = socket_address_get_path(&p->address);
1959 else if (p->type == SOCKET_FIFO)
1960 path = p->path;
1961
1962 if (!path)
1963 continue;
1964
1965 if (chown(path, uid, gid) < 0) {
1966 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1967 _exit(EXIT_CHOWN);
1968 }
1969 }
1970
1971 _exit(EXIT_SUCCESS);
1972 }
1973
1974 r = unit_watch_pid(UNIT(s), pid);
1975 if (r < 0)
1976 goto fail;
1977
1978 *_pid = pid;
1979 return 0;
1980
1981 fail:
1982 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1983 return r;
1984 }
1985
1986 static void socket_enter_dead(Socket *s, SocketResult f) {
1987 assert(s);
1988
1989 if (s->result == SOCKET_SUCCESS)
1990 s->result = f;
1991
1992 if (s->result != SOCKET_SUCCESS)
1993 log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
1994
1995 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1996
1997 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1998
1999 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
2000
2001 unit_unref_uid_gid(UNIT(s), true);
2002
2003 dynamic_creds_destroy(&s->dynamic_creds);
2004 }
2005
2006 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2007
2008 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2009 int r;
2010 assert(s);
2011
2012 if (s->result == SOCKET_SUCCESS)
2013 s->result = f;
2014
2015 socket_unwatch_control_pid(s);
2016 s->control_command_id = SOCKET_EXEC_STOP_POST;
2017 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2018
2019 if (s->control_command) {
2020 r = socket_spawn(s, s->control_command, &s->control_pid);
2021 if (r < 0)
2022 goto fail;
2023
2024 socket_set_state(s, SOCKET_STOP_POST);
2025 } else
2026 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2027
2028 return;
2029
2030 fail:
2031 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2032 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2033 }
2034
2035 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2036 int r;
2037
2038 assert(s);
2039
2040 if (s->result == SOCKET_SUCCESS)
2041 s->result = f;
2042
2043 r = unit_kill_context(
2044 UNIT(s),
2045 &s->kill_context,
2046 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2047 KILL_KILL : KILL_TERMINATE,
2048 -1,
2049 s->control_pid,
2050 false);
2051 if (r < 0)
2052 goto fail;
2053
2054 if (r > 0) {
2055 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2056 if (r < 0)
2057 goto fail;
2058
2059 socket_set_state(s, state);
2060 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2061 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2062 else if (state == SOCKET_STOP_PRE_SIGKILL)
2063 socket_enter_stop_post(s, SOCKET_SUCCESS);
2064 else if (state == SOCKET_FINAL_SIGTERM)
2065 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2066 else
2067 socket_enter_dead(s, SOCKET_SUCCESS);
2068
2069 return;
2070
2071 fail:
2072 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2073
2074 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2075 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2076 else
2077 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2078 }
2079
2080 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2081 int r;
2082 assert(s);
2083
2084 if (s->result == SOCKET_SUCCESS)
2085 s->result = f;
2086
2087 socket_unwatch_control_pid(s);
2088 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2089 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2090
2091 if (s->control_command) {
2092 r = socket_spawn(s, s->control_command, &s->control_pid);
2093 if (r < 0)
2094 goto fail;
2095
2096 socket_set_state(s, SOCKET_STOP_PRE);
2097 } else
2098 socket_enter_stop_post(s, SOCKET_SUCCESS);
2099
2100 return;
2101
2102 fail:
2103 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2104 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2105 }
2106
2107 static void socket_enter_listening(Socket *s) {
2108 int r;
2109 assert(s);
2110
2111 r = socket_watch_fds(s);
2112 if (r < 0) {
2113 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2114 goto fail;
2115 }
2116
2117 socket_set_state(s, SOCKET_LISTENING);
2118 return;
2119
2120 fail:
2121 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2122 }
2123
2124 static void socket_enter_start_post(Socket *s) {
2125 int r;
2126 assert(s);
2127
2128 socket_unwatch_control_pid(s);
2129 s->control_command_id = SOCKET_EXEC_START_POST;
2130 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2131
2132 if (s->control_command) {
2133 r = socket_spawn(s, s->control_command, &s->control_pid);
2134 if (r < 0) {
2135 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2136 goto fail;
2137 }
2138
2139 socket_set_state(s, SOCKET_START_POST);
2140 } else
2141 socket_enter_listening(s);
2142
2143 return;
2144
2145 fail:
2146 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2147 }
2148
2149 static void socket_enter_start_chown(Socket *s) {
2150 int r;
2151
2152 assert(s);
2153
2154 r = socket_open_fds(s);
2155 if (r < 0) {
2156 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2157 goto fail;
2158 }
2159
2160 if (!isempty(s->user) || !isempty(s->group)) {
2161
2162 socket_unwatch_control_pid(s);
2163 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2164 s->control_command = NULL;
2165
2166 r = socket_chown(s, &s->control_pid);
2167 if (r < 0) {
2168 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2169 goto fail;
2170 }
2171
2172 socket_set_state(s, SOCKET_START_CHOWN);
2173 } else
2174 socket_enter_start_post(s);
2175
2176 return;
2177
2178 fail:
2179 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2180 }
2181
2182 static void socket_enter_start_pre(Socket *s) {
2183 int r;
2184 assert(s);
2185
2186 socket_unwatch_control_pid(s);
2187
2188 unit_warn_leftover_processes(UNIT(s));
2189
2190 s->control_command_id = SOCKET_EXEC_START_PRE;
2191 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2192
2193 if (s->control_command) {
2194 r = socket_spawn(s, s->control_command, &s->control_pid);
2195 if (r < 0) {
2196 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2197 goto fail;
2198 }
2199
2200 socket_set_state(s, SOCKET_START_PRE);
2201 } else
2202 socket_enter_start_chown(s);
2203
2204 return;
2205
2206 fail:
2207 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2208 }
2209
2210 static void flush_ports(Socket *s) {
2211 SocketPort *p;
2212
2213 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2214 * anymore */
2215
2216 LIST_FOREACH(port, p, s->ports) {
2217 if (p->fd < 0)
2218 continue;
2219
2220 (void) flush_accept(p->fd);
2221 (void) flush_fd(p->fd);
2222 }
2223 }
2224
2225 static void socket_enter_running(Socket *s, int cfd) {
2226 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2227 int r;
2228
2229 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2230 * close it. */
2231
2232 assert(s);
2233
2234 /* We don't take connections anymore if we are supposed to shut down anyway */
2235 if (unit_stop_pending(UNIT(s))) {
2236
2237 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2238
2239 if (cfd >= 0)
2240 goto refuse;
2241 else
2242 flush_ports(s);
2243
2244 return;
2245 }
2246
2247 if (!ratelimit_below(&s->trigger_limit)) {
2248 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2249 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2250 goto refuse;
2251 }
2252
2253 if (cfd < 0) {
2254 bool pending = false;
2255 Unit *other;
2256 Iterator i;
2257 void *v;
2258
2259 /* If there's already a start pending don't bother to
2260 * do anything */
2261 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2262 if (unit_active_or_pending(other)) {
2263 pending = true;
2264 break;
2265 }
2266
2267 if (!pending) {
2268 if (!UNIT_ISSET(s->service)) {
2269 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2270 r = -ENOENT;
2271 goto fail;
2272 }
2273
2274 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2275 if (r < 0)
2276 goto fail;
2277 }
2278
2279 socket_set_state(s, SOCKET_RUNNING);
2280 } else {
2281 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2282 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2283 Service *service;
2284
2285 if (s->n_connections >= s->max_connections) {
2286 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2287 s->n_connections);
2288 goto refuse;
2289 }
2290
2291 if (s->max_connections_per_source > 0) {
2292 r = socket_acquire_peer(s, cfd, &p);
2293 if (r < 0) {
2294 goto refuse;
2295 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2296 _cleanup_free_ char *t = NULL;
2297
2298 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2299
2300 log_unit_warning(UNIT(s),
2301 "Too many incoming connections (%u) from source %s, dropping connection.",
2302 p->n_ref, strnull(t));
2303 goto refuse;
2304 }
2305 }
2306
2307 r = socket_instantiate_service(s);
2308 if (r < 0)
2309 goto fail;
2310
2311 r = instance_from_socket(cfd, s->n_accepted, &instance);
2312 if (r < 0) {
2313 if (r != -ENOTCONN)
2314 goto fail;
2315
2316 /* ENOTCONN is legitimate if TCP RST was received.
2317 * This connection is over, but the socket unit lives on. */
2318 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2319 goto refuse;
2320 }
2321
2322 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2323 if (r < 0)
2324 goto fail;
2325
2326 r = unit_name_build(prefix, instance, ".service", &name);
2327 if (r < 0)
2328 goto fail;
2329
2330 r = unit_add_name(UNIT_DEREF(s->service), name);
2331 if (r < 0)
2332 goto fail;
2333
2334 service = SERVICE(UNIT_DEREF(s->service));
2335 unit_ref_unset(&s->service);
2336
2337 s->n_accepted++;
2338 unit_choose_id(UNIT(service), name);
2339
2340 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2341 if (r < 0)
2342 goto fail;
2343
2344 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2345 s->n_connections++;
2346
2347 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2348
2349 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2350 if (r < 0) {
2351 /* We failed to activate the new service, but it still exists. Let's make sure the service
2352 * closes and forgets the connection fd again, immediately. */
2353 service_close_socket_fd(service);
2354 goto fail;
2355 }
2356
2357 /* Notify clients about changed counters */
2358 unit_add_to_dbus_queue(UNIT(s));
2359 }
2360
2361 return;
2362
2363 refuse:
2364 s->n_refused++;
2365 safe_close(cfd);
2366 return;
2367
2368 fail:
2369 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2370 cfd >= 0 ? "template" : "non-template",
2371 bus_error_message(&error, r));
2372
2373 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2374 safe_close(cfd);
2375 }
2376
2377 static void socket_run_next(Socket *s) {
2378 int r;
2379
2380 assert(s);
2381 assert(s->control_command);
2382 assert(s->control_command->command_next);
2383
2384 socket_unwatch_control_pid(s);
2385
2386 s->control_command = s->control_command->command_next;
2387
2388 r = socket_spawn(s, s->control_command, &s->control_pid);
2389 if (r < 0)
2390 goto fail;
2391
2392 return;
2393
2394 fail:
2395 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2396
2397 if (s->state == SOCKET_START_POST)
2398 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2399 else if (s->state == SOCKET_STOP_POST)
2400 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2401 else
2402 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2403 }
2404
2405 static int socket_start(Unit *u) {
2406 Socket *s = SOCKET(u);
2407 int r;
2408
2409 assert(s);
2410
2411 /* We cannot fulfill this request right now, try again later
2412 * please! */
2413 if (IN_SET(s->state,
2414 SOCKET_STOP_PRE,
2415 SOCKET_STOP_PRE_SIGKILL,
2416 SOCKET_STOP_PRE_SIGTERM,
2417 SOCKET_STOP_POST,
2418 SOCKET_FINAL_SIGTERM,
2419 SOCKET_FINAL_SIGKILL))
2420 return -EAGAIN;
2421
2422 /* Already on it! */
2423 if (IN_SET(s->state,
2424 SOCKET_START_PRE,
2425 SOCKET_START_CHOWN,
2426 SOCKET_START_POST))
2427 return 0;
2428
2429 /* Cannot run this without the service being around */
2430 if (UNIT_ISSET(s->service)) {
2431 Service *service;
2432
2433 service = SERVICE(UNIT_DEREF(s->service));
2434
2435 if (UNIT(service)->load_state != UNIT_LOADED) {
2436 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2437 return -ENOENT;
2438 }
2439
2440 /* If the service is already active we cannot start the
2441 * socket */
2442 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2443 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2444 return -EBUSY;
2445 }
2446 }
2447
2448 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2449
2450 r = unit_start_limit_test(u);
2451 if (r < 0) {
2452 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2453 return r;
2454 }
2455
2456 r = unit_acquire_invocation_id(u);
2457 if (r < 0)
2458 return r;
2459
2460 s->result = SOCKET_SUCCESS;
2461 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
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 unit_serialize_item_format(u, f, "n-refused", "%u", s->n_refused);
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, "n-refused")) {
2594 unsigned k;
2595
2596 if (safe_atou(value, &k) < 0)
2597 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2598 else
2599 s->n_refused += k;
2600 } else if (streq(key, "control-pid")) {
2601 pid_t pid;
2602
2603 if (parse_pid(value, &pid) < 0)
2604 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2605 else
2606 s->control_pid = pid;
2607 } else if (streq(key, "control-command")) {
2608 SocketExecCommand id;
2609
2610 id = socket_exec_command_from_string(value);
2611 if (id < 0)
2612 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2613 else {
2614 s->control_command_id = id;
2615 s->control_command = s->exec_command[id];
2616 }
2617 } else if (streq(key, "fifo")) {
2618 int fd, skip = 0;
2619 SocketPort *p;
2620
2621 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2622 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2623 else
2624 LIST_FOREACH(port, p, s->ports)
2625 if (p->type == SOCKET_FIFO &&
2626 path_equal_or_files_same(p->path, value+skip, 0)) {
2627 socket_port_take_fd(p, fds, fd);
2628 break;
2629 }
2630
2631 } else if (streq(key, "special")) {
2632 int fd, skip = 0;
2633 SocketPort *p;
2634
2635 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2636 log_unit_debug(u, "Failed to parse special value: %s", value);
2637 else
2638 LIST_FOREACH(port, p, s->ports)
2639 if (p->type == SOCKET_SPECIAL &&
2640 path_equal_or_files_same(p->path, value+skip, 0)) {
2641 socket_port_take_fd(p, fds, fd);
2642 break;
2643 }
2644
2645 } else if (streq(key, "mqueue")) {
2646 int fd, skip = 0;
2647 SocketPort *p;
2648
2649 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2650 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2651 else
2652 LIST_FOREACH(port, p, s->ports)
2653 if (p->type == SOCKET_MQUEUE &&
2654 streq(p->path, value+skip)) {
2655 socket_port_take_fd(p, fds, fd);
2656 break;
2657 }
2658
2659 } else if (streq(key, "socket")) {
2660 int fd, type, skip = 0;
2661 SocketPort *p;
2662
2663 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2664 log_unit_debug(u, "Failed to parse socket value: %s", value);
2665 else
2666 LIST_FOREACH(port, p, s->ports)
2667 if (socket_address_is(&p->address, value+skip, type)) {
2668 socket_port_take_fd(p, fds, fd);
2669 break;
2670 }
2671
2672 } else if (streq(key, "netlink")) {
2673 int fd, skip = 0;
2674 SocketPort *p;
2675
2676 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2677 log_unit_debug(u, "Failed to parse socket value: %s", value);
2678 else
2679 LIST_FOREACH(port, p, s->ports)
2680 if (socket_address_is_netlink(&p->address, value+skip)) {
2681 socket_port_take_fd(p, fds, fd);
2682 break;
2683 }
2684
2685 } else if (streq(key, "ffs")) {
2686 int fd, skip = 0;
2687 SocketPort *p;
2688
2689 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2690 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2691 else
2692 LIST_FOREACH(port, p, s->ports)
2693 if (p->type == SOCKET_USB_FUNCTION &&
2694 path_equal_or_files_same(p->path, value+skip, 0)) {
2695 socket_port_take_fd(p, fds, fd);
2696 break;
2697 }
2698
2699 } else
2700 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2701
2702 return 0;
2703 }
2704
2705 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2706 Socket *s = SOCKET(u);
2707 SocketPort *p;
2708
2709 assert(u);
2710
2711 LIST_FOREACH(port, p, s->ports) {
2712 Iterator i;
2713 int fd;
2714
2715 if (p->type != SOCKET_SOCKET)
2716 continue;
2717
2718 if (p->fd >= 0)
2719 continue;
2720
2721 FDSET_FOREACH(fd, fds, i) {
2722 if (socket_address_matches_fd(&p->address, fd)) {
2723 p->fd = fdset_remove(fds, fd);
2724 s->deserialized_state = SOCKET_LISTENING;
2725 break;
2726 }
2727 }
2728 }
2729 }
2730
2731 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2732 assert(u);
2733
2734 return state_translation_table[SOCKET(u)->state];
2735 }
2736
2737 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2738 assert(u);
2739
2740 return socket_state_to_string(SOCKET(u)->state);
2741 }
2742
2743 const char* socket_port_type_to_string(SocketPort *p) {
2744
2745 assert(p);
2746
2747 switch (p->type) {
2748
2749 case SOCKET_SOCKET:
2750
2751 switch (p->address.type) {
2752
2753 case SOCK_STREAM:
2754 return "Stream";
2755
2756 case SOCK_DGRAM:
2757 return "Datagram";
2758
2759 case SOCK_SEQPACKET:
2760 return "SequentialPacket";
2761
2762 case SOCK_RAW:
2763 if (socket_address_family(&p->address) == AF_NETLINK)
2764 return "Netlink";
2765
2766 _fallthrough_;
2767 default:
2768 return NULL;
2769 }
2770
2771 case SOCKET_SPECIAL:
2772 return "Special";
2773
2774 case SOCKET_MQUEUE:
2775 return "MessageQueue";
2776
2777 case SOCKET_FIFO:
2778 return "FIFO";
2779
2780 case SOCKET_USB_FUNCTION:
2781 return "USBFunction";
2782
2783 default:
2784 return NULL;
2785 }
2786 }
2787
2788 SocketType socket_port_type_from_string(const char *s) {
2789 assert(s);
2790
2791 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2792 return SOCKET_SOCKET;
2793 else if (streq(s, "Special"))
2794 return SOCKET_SPECIAL;
2795 else if (streq(s, "MessageQueue"))
2796 return SOCKET_MQUEUE;
2797 else if (streq(s, "FIFO"))
2798 return SOCKET_FIFO;
2799 else if (streq(s, "USBFunction"))
2800 return SOCKET_USB_FUNCTION;
2801 else
2802 return _SOCKET_TYPE_INVALID;
2803 }
2804
2805 _pure_ static bool socket_may_gc(Unit *u) {
2806 Socket *s = SOCKET(u);
2807
2808 assert(u);
2809
2810 return s->n_connections == 0;
2811 }
2812
2813 static int socket_accept_do(Socket *s, int fd) {
2814 int cfd;
2815
2816 assert(s);
2817 assert(fd >= 0);
2818
2819 for (;;) {
2820 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2821 if (cfd < 0) {
2822 if (errno == EINTR)
2823 continue;
2824
2825 return -errno;
2826 }
2827
2828 break;
2829 }
2830
2831 return cfd;
2832 }
2833
2834 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2835 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2836 int cfd, r;
2837 pid_t pid;
2838
2839 assert(s);
2840 assert(p);
2841 assert(fd >= 0);
2842
2843 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2844 * connection socket is also properly associated with the cgroup. */
2845
2846 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2847 goto shortcut;
2848
2849 r = bpf_firewall_supported();
2850 if (r < 0)
2851 return r;
2852 if (r == BPF_FIREWALL_UNSUPPORTED)
2853 goto shortcut;
2854
2855 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2856 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2857
2858 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2859 if (r < 0)
2860 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2861 if (r == 0) {
2862 /* Child */
2863
2864 pair[0] = safe_close(pair[0]);
2865
2866 cfd = socket_accept_do(s, fd);
2867 if (cfd < 0) {
2868 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2869 _exit(EXIT_FAILURE);
2870 }
2871
2872 r = send_one_fd(pair[1], cfd, 0);
2873 if (r < 0) {
2874 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2875 _exit(EXIT_FAILURE);
2876 }
2877
2878 _exit(EXIT_SUCCESS);
2879 }
2880
2881 pair[1] = safe_close(pair[1]);
2882 cfd = receive_one_fd(pair[0], 0);
2883
2884 /* We synchronously wait for the helper, as it shouldn't be slow */
2885 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2886 if (r < 0) {
2887 safe_close(cfd);
2888 return r;
2889 }
2890
2891 if (cfd < 0)
2892 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2893
2894 return cfd;
2895
2896 shortcut:
2897 cfd = socket_accept_do(s, fd);
2898 if (cfd < 0)
2899 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2900
2901 return cfd;
2902 }
2903
2904 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2905 SocketPort *p = userdata;
2906 int cfd = -1;
2907
2908 assert(p);
2909 assert(fd >= 0);
2910
2911 if (p->socket->state != SOCKET_LISTENING)
2912 return 0;
2913
2914 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2915
2916 if (revents != EPOLLIN) {
2917
2918 if (revents & EPOLLHUP)
2919 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.");
2920 else
2921 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2922 goto fail;
2923 }
2924
2925 if (p->socket->accept &&
2926 p->type == SOCKET_SOCKET &&
2927 socket_address_can_accept(&p->address)) {
2928
2929 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2930 if (cfd < 0)
2931 goto fail;
2932
2933 socket_apply_socket_options(p->socket, cfd);
2934 }
2935
2936 socket_enter_running(p->socket, cfd);
2937 return 0;
2938
2939 fail:
2940 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2941 return 0;
2942 }
2943
2944 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2945 Socket *s = SOCKET(u);
2946 SocketResult f;
2947
2948 assert(s);
2949 assert(pid >= 0);
2950
2951 if (pid != s->control_pid)
2952 return;
2953
2954 s->control_pid = 0;
2955
2956 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2957 f = SOCKET_SUCCESS;
2958 else if (code == CLD_EXITED)
2959 f = SOCKET_FAILURE_EXIT_CODE;
2960 else if (code == CLD_KILLED)
2961 f = SOCKET_FAILURE_SIGNAL;
2962 else if (code == CLD_DUMPED)
2963 f = SOCKET_FAILURE_CORE_DUMP;
2964 else
2965 assert_not_reached("Unknown sigchld code");
2966
2967 if (s->control_command) {
2968 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2969
2970 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2971 f = SOCKET_SUCCESS;
2972 }
2973
2974 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2975 "Control process exited, code=%s status=%i",
2976 sigchld_code_to_string(code), status);
2977
2978 if (s->result == SOCKET_SUCCESS)
2979 s->result = f;
2980
2981 if (s->control_command &&
2982 s->control_command->command_next &&
2983 f == SOCKET_SUCCESS) {
2984
2985 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2986 socket_run_next(s);
2987 } else {
2988 s->control_command = NULL;
2989 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2990
2991 /* No further commands for this step, so let's figure
2992 * out what to do next */
2993
2994 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2995
2996 switch (s->state) {
2997
2998 case SOCKET_START_PRE:
2999 if (f == SOCKET_SUCCESS)
3000 socket_enter_start_chown(s);
3001 else
3002 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3003 break;
3004
3005 case SOCKET_START_CHOWN:
3006 if (f == SOCKET_SUCCESS)
3007 socket_enter_start_post(s);
3008 else
3009 socket_enter_stop_pre(s, f);
3010 break;
3011
3012 case SOCKET_START_POST:
3013 if (f == SOCKET_SUCCESS)
3014 socket_enter_listening(s);
3015 else
3016 socket_enter_stop_pre(s, f);
3017 break;
3018
3019 case SOCKET_STOP_PRE:
3020 case SOCKET_STOP_PRE_SIGTERM:
3021 case SOCKET_STOP_PRE_SIGKILL:
3022 socket_enter_stop_post(s, f);
3023 break;
3024
3025 case SOCKET_STOP_POST:
3026 case SOCKET_FINAL_SIGTERM:
3027 case SOCKET_FINAL_SIGKILL:
3028 socket_enter_dead(s, f);
3029 break;
3030
3031 default:
3032 assert_not_reached("Uh, control process died at wrong time.");
3033 }
3034 }
3035
3036 /* Notify clients about changed exit status */
3037 unit_add_to_dbus_queue(u);
3038 }
3039
3040 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3041 Socket *s = SOCKET(userdata);
3042
3043 assert(s);
3044 assert(s->timer_event_source == source);
3045
3046 switch (s->state) {
3047
3048 case SOCKET_START_PRE:
3049 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3050 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3051 break;
3052
3053 case SOCKET_START_CHOWN:
3054 case SOCKET_START_POST:
3055 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3056 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3057 break;
3058
3059 case SOCKET_STOP_PRE:
3060 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3061 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3062 break;
3063
3064 case SOCKET_STOP_PRE_SIGTERM:
3065 if (s->kill_context.send_sigkill) {
3066 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3067 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3068 } else {
3069 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3070 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3071 }
3072 break;
3073
3074 case SOCKET_STOP_PRE_SIGKILL:
3075 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3076 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3077 break;
3078
3079 case SOCKET_STOP_POST:
3080 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3081 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3082 break;
3083
3084 case SOCKET_FINAL_SIGTERM:
3085 if (s->kill_context.send_sigkill) {
3086 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3087 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3088 } else {
3089 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3090 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3091 }
3092 break;
3093
3094 case SOCKET_FINAL_SIGKILL:
3095 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3096 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3097 break;
3098
3099 default:
3100 assert_not_reached("Timeout at wrong time.");
3101 }
3102
3103 return 0;
3104 }
3105
3106 int socket_collect_fds(Socket *s, int **fds) {
3107 size_t k = 0, n = 0;
3108 SocketPort *p;
3109 int *rfds;
3110
3111 assert(s);
3112 assert(fds);
3113
3114 /* Called from the service code for requesting our fds */
3115
3116 LIST_FOREACH(port, p, s->ports) {
3117 if (p->fd >= 0)
3118 n++;
3119 n += p->n_auxiliary_fds;
3120 }
3121
3122 if (n <= 0) {
3123 *fds = NULL;
3124 return 0;
3125 }
3126
3127 rfds = new(int, n);
3128 if (!rfds)
3129 return -ENOMEM;
3130
3131 LIST_FOREACH(port, p, s->ports) {
3132 size_t i;
3133
3134 if (p->fd >= 0)
3135 rfds[k++] = p->fd;
3136 for (i = 0; i < p->n_auxiliary_fds; ++i)
3137 rfds[k++] = p->auxiliary_fds[i];
3138 }
3139
3140 assert(k == n);
3141
3142 *fds = rfds;
3143 return (int) n;
3144 }
3145
3146 static void socket_reset_failed(Unit *u) {
3147 Socket *s = SOCKET(u);
3148
3149 assert(s);
3150
3151 if (s->state == SOCKET_FAILED)
3152 socket_set_state(s, SOCKET_DEAD);
3153
3154 s->result = SOCKET_SUCCESS;
3155 }
3156
3157 void socket_connection_unref(Socket *s) {
3158 assert(s);
3159
3160 /* The service is dead. Yay!
3161 *
3162 * This is strictly for one-instance-per-connection
3163 * services. */
3164
3165 assert(s->n_connections > 0);
3166 s->n_connections--;
3167
3168 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3169 }
3170
3171 static void socket_trigger_notify(Unit *u, Unit *other) {
3172 Socket *s = SOCKET(u);
3173
3174 assert(u);
3175 assert(other);
3176
3177 /* Filter out invocations with bogus state */
3178 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3179 return;
3180
3181 /* Don't propagate state changes from the service if we are already down */
3182 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3183 return;
3184
3185 /* We don't care for the service state if we are in Accept=yes mode */
3186 if (s->accept)
3187 return;
3188
3189 /* Propagate start limit hit state */
3190 if (other->start_limit_hit) {
3191 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3192 return;
3193 }
3194
3195 /* Don't propagate anything if there's still a job queued */
3196 if (other->job)
3197 return;
3198
3199 if (IN_SET(SERVICE(other)->state,
3200 SERVICE_DEAD, SERVICE_FAILED,
3201 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3202 SERVICE_AUTO_RESTART))
3203 socket_enter_listening(s);
3204
3205 if (SERVICE(other)->state == SERVICE_RUNNING)
3206 socket_set_state(s, SOCKET_RUNNING);
3207 }
3208
3209 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3210 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3211 }
3212
3213 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3214 Socket *s = SOCKET(u);
3215 usec_t t;
3216 int r;
3217
3218 if (!s->timer_event_source)
3219 return 0;
3220
3221 r = sd_event_source_get_time(s->timer_event_source, &t);
3222 if (r < 0)
3223 return r;
3224 if (t == USEC_INFINITY)
3225 return 0;
3226
3227 *timeout = t;
3228 return 1;
3229 }
3230
3231 char *socket_fdname(Socket *s) {
3232 assert(s);
3233
3234 /* Returns the name to use for $LISTEN_NAMES. If the user
3235 * didn't specify anything specifically, use the socket unit's
3236 * name as fallback. */
3237
3238 return s->fdname ?: UNIT(s)->id;
3239 }
3240
3241 static int socket_control_pid(Unit *u) {
3242 Socket *s = SOCKET(u);
3243
3244 assert(s);
3245
3246 return s->control_pid;
3247 }
3248
3249 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3250 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3251 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3252 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3253 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3254 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3255 };
3256
3257 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3258
3259 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3260 [SOCKET_SUCCESS] = "success",
3261 [SOCKET_FAILURE_RESOURCES] = "resources",
3262 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3263 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3264 [SOCKET_FAILURE_SIGNAL] = "signal",
3265 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3266 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3267 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3268 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3269 };
3270
3271 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3272
3273 const UnitVTable socket_vtable = {
3274 .object_size = sizeof(Socket),
3275 .exec_context_offset = offsetof(Socket, exec_context),
3276 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3277 .kill_context_offset = offsetof(Socket, kill_context),
3278 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3279 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3280
3281 .sections =
3282 "Unit\0"
3283 "Socket\0"
3284 "Install\0",
3285 .private_section = "Socket",
3286
3287 .can_transient = true,
3288
3289 .init = socket_init,
3290 .done = socket_done,
3291 .load = socket_load,
3292
3293 .coldplug = socket_coldplug,
3294
3295 .dump = socket_dump,
3296
3297 .start = socket_start,
3298 .stop = socket_stop,
3299
3300 .kill = socket_kill,
3301
3302 .get_timeout = socket_get_timeout,
3303
3304 .serialize = socket_serialize,
3305 .deserialize_item = socket_deserialize_item,
3306 .distribute_fds = socket_distribute_fds,
3307
3308 .active_state = socket_active_state,
3309 .sub_state_to_string = socket_sub_state_to_string,
3310
3311 .may_gc = socket_may_gc,
3312
3313 .sigchld_event = socket_sigchld_event,
3314
3315 .trigger_notify = socket_trigger_notify,
3316
3317 .reset_failed = socket_reset_failed,
3318
3319 .control_pid = socket_control_pid,
3320
3321 .bus_vtable = bus_socket_vtable,
3322 .bus_set_property = bus_socket_set_property,
3323 .bus_commit_properties = bus_socket_commit_properties,
3324
3325 .status_message_formats = {
3326 /*.starting_stopping = {
3327 [0] = "Starting socket %s...",
3328 [1] = "Stopping socket %s...",
3329 },*/
3330 .finished_start_job = {
3331 [JOB_DONE] = "Listening on %s.",
3332 [JOB_FAILED] = "Failed to listen on %s.",
3333 [JOB_TIMEOUT] = "Timed out starting %s.",
3334 },
3335 .finished_stop_job = {
3336 [JOB_DONE] = "Closed %s.",
3337 [JOB_FAILED] = "Failed stopping %s.",
3338 [JOB_TIMEOUT] = "Timed out stopping %s.",
3339 },
3340 },
3341 };
Unnamed repository; edit this file 'description' to name the repository.