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core: whenever we change state of a unit, force out PropertiesChanged bus signal
[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 "dbus-unit.h"
21 #include "def.h"
22 #include "exit-status.h"
23 #include "fd-util.h"
24 #include "format-util.h"
25 #include "fs-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "label.h"
29 #include "log.h"
30 #include "missing.h"
31 #include "mkdir.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "signal-util.h"
38 #include "smack-util.h"
39 #include "socket-protocol-list.h"
40 #include "socket.h"
41 #include "special.h"
42 #include "string-table.h"
43 #include "string-util.h"
44 #include "strv.h"
45 #include "unit-name.h"
46 #include "unit.h"
47 #include "user-util.h"
48
49 struct SocketPeer {
50 unsigned n_ref;
51
52 Socket *socket;
53 union sockaddr_union peer;
54 socklen_t peer_salen;
55 };
56
57 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
58 [SOCKET_DEAD] = UNIT_INACTIVE,
59 [SOCKET_START_PRE] = UNIT_ACTIVATING,
60 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
61 [SOCKET_START_POST] = UNIT_ACTIVATING,
62 [SOCKET_LISTENING] = UNIT_ACTIVE,
63 [SOCKET_RUNNING] = UNIT_ACTIVE,
64 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
65 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
68 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
70 [SOCKET_FAILED] = UNIT_FAILED
71 };
72
73 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
74 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
75
76 static void socket_init(Unit *u) {
77 Socket *s = SOCKET(u);
78
79 assert(u);
80 assert(u->load_state == UNIT_STUB);
81
82 s->backlog = SOMAXCONN;
83 s->timeout_usec = u->manager->default_timeout_start_usec;
84 s->directory_mode = 0755;
85 s->socket_mode = 0666;
86
87 s->max_connections = 64;
88
89 s->priority = -1;
90 s->ip_tos = -1;
91 s->ip_ttl = -1;
92 s->mark = -1;
93
94 s->exec_context.std_output = u->manager->default_std_output;
95 s->exec_context.std_error = u->manager->default_std_error;
96
97 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
98
99 s->trigger_limit.interval = USEC_INFINITY;
100 s->trigger_limit.burst = (unsigned) -1;
101 }
102
103 static void socket_unwatch_control_pid(Socket *s) {
104 assert(s);
105
106 if (s->control_pid <= 0)
107 return;
108
109 unit_unwatch_pid(UNIT(s), s->control_pid);
110 s->control_pid = 0;
111 }
112
113 static void socket_cleanup_fd_list(SocketPort *p) {
114 assert(p);
115
116 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
117 p->auxiliary_fds = mfree(p->auxiliary_fds);
118 p->n_auxiliary_fds = 0;
119 }
120
121 void socket_free_ports(Socket *s) {
122 SocketPort *p;
123
124 assert(s);
125
126 while ((p = s->ports)) {
127 LIST_REMOVE(port, s->ports, p);
128
129 sd_event_source_unref(p->event_source);
130
131 socket_cleanup_fd_list(p);
132 safe_close(p->fd);
133 free(p->path);
134 free(p);
135 }
136 }
137
138 static void socket_done(Unit *u) {
139 Socket *s = SOCKET(u);
140 SocketPeer *p;
141
142 assert(s);
143
144 socket_free_ports(s);
145
146 while ((p = set_steal_first(s->peers_by_address)))
147 p->socket = NULL;
148
149 s->peers_by_address = set_free(s->peers_by_address);
150
151 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
152 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
153 s->control_command = NULL;
154
155 dynamic_creds_unref(&s->dynamic_creds);
156
157 socket_unwatch_control_pid(s);
158
159 unit_ref_unset(&s->service);
160
161 s->tcp_congestion = mfree(s->tcp_congestion);
162 s->bind_to_device = mfree(s->bind_to_device);
163
164 s->smack = mfree(s->smack);
165 s->smack_ip_in = mfree(s->smack_ip_in);
166 s->smack_ip_out = mfree(s->smack_ip_out);
167
168 strv_free(s->symlinks);
169
170 s->user = mfree(s->user);
171 s->group = mfree(s->group);
172
173 s->fdname = mfree(s->fdname);
174
175 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
176 }
177
178 static int socket_arm_timer(Socket *s, usec_t usec) {
179 int r;
180
181 assert(s);
182
183 if (s->timer_event_source) {
184 r = sd_event_source_set_time(s->timer_event_source, usec);
185 if (r < 0)
186 return r;
187
188 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
189 }
190
191 if (usec == USEC_INFINITY)
192 return 0;
193
194 r = sd_event_add_time(
195 UNIT(s)->manager->event,
196 &s->timer_event_source,
197 CLOCK_MONOTONIC,
198 usec, 0,
199 socket_dispatch_timer, s);
200 if (r < 0)
201 return r;
202
203 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
204
205 return 0;
206 }
207
208 int socket_instantiate_service(Socket *s) {
209 _cleanup_free_ char *prefix = NULL, *name = NULL;
210 int r;
211 Unit *u;
212
213 assert(s);
214
215 /* This fills in s->service if it isn't filled in yet. For
216 * Accept=yes sockets we create the next connection service
217 * here. For Accept=no this is mostly a NOP since the service
218 * is figured out at load time anyway. */
219
220 if (UNIT_DEREF(s->service))
221 return 0;
222
223 if (!s->accept)
224 return 0;
225
226 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
227 if (r < 0)
228 return r;
229
230 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
231 return -ENOMEM;
232
233 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
234 if (r < 0)
235 return r;
236
237 unit_ref_set(&s->service, UNIT(s), u);
238
239 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
240 }
241
242 static bool have_non_accept_socket(Socket *s) {
243 SocketPort *p;
244
245 assert(s);
246
247 if (!s->accept)
248 return true;
249
250 LIST_FOREACH(port, p, s->ports) {
251
252 if (p->type != SOCKET_SOCKET)
253 return true;
254
255 if (!socket_address_can_accept(&p->address))
256 return true;
257 }
258
259 return false;
260 }
261
262 static int socket_add_mount_dependencies(Socket *s) {
263 SocketPort *p;
264 int r;
265
266 assert(s);
267
268 LIST_FOREACH(port, p, s->ports) {
269 const char *path = NULL;
270
271 if (p->type == SOCKET_SOCKET)
272 path = socket_address_get_path(&p->address);
273 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
274 path = p->path;
275
276 if (!path)
277 continue;
278
279 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
280 if (r < 0)
281 return r;
282 }
283
284 return 0;
285 }
286
287 static int socket_add_device_dependencies(Socket *s) {
288 char *t;
289
290 assert(s);
291
292 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
293 return 0;
294
295 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
296 return unit_add_node_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
297 }
298
299 static int socket_add_default_dependencies(Socket *s) {
300 int r;
301 assert(s);
302
303 if (!UNIT(s)->default_dependencies)
304 return 0;
305
306 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
307 if (r < 0)
308 return r;
309
310 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
311 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
312 if (r < 0)
313 return r;
314 }
315
316 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
317 }
318
319 _pure_ static bool socket_has_exec(Socket *s) {
320 unsigned i;
321 assert(s);
322
323 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
324 if (s->exec_command[i])
325 return true;
326
327 return false;
328 }
329
330 static int socket_add_extras(Socket *s) {
331 Unit *u = UNIT(s);
332 int r;
333
334 assert(s);
335
336 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
337 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
338 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
339 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
340 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
341 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
342 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
343 * service starts are typical. */
344
345 if (s->trigger_limit.interval == USEC_INFINITY)
346 s->trigger_limit.interval = 2 * USEC_PER_SEC;
347
348 if (s->trigger_limit.burst == (unsigned) -1) {
349 if (s->accept)
350 s->trigger_limit.burst = 200;
351 else
352 s->trigger_limit.burst = 20;
353 }
354
355 if (have_non_accept_socket(s)) {
356
357 if (!UNIT_DEREF(s->service)) {
358 Unit *x;
359
360 r = unit_load_related_unit(u, ".service", &x);
361 if (r < 0)
362 return r;
363
364 unit_ref_set(&s->service, u, x);
365 }
366
367 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
368 if (r < 0)
369 return r;
370 }
371
372 r = socket_add_mount_dependencies(s);
373 if (r < 0)
374 return r;
375
376 r = socket_add_device_dependencies(s);
377 if (r < 0)
378 return r;
379
380 r = unit_patch_contexts(u);
381 if (r < 0)
382 return r;
383
384 if (socket_has_exec(s)) {
385 r = unit_add_exec_dependencies(u, &s->exec_context);
386 if (r < 0)
387 return r;
388 }
389
390 r = unit_set_default_slice(u);
391 if (r < 0)
392 return r;
393
394 r = socket_add_default_dependencies(s);
395 if (r < 0)
396 return r;
397
398 return 0;
399 }
400
401 static const char *socket_find_symlink_target(Socket *s) {
402 const char *found = NULL;
403 SocketPort *p;
404
405 LIST_FOREACH(port, p, s->ports) {
406 const char *f = NULL;
407
408 switch (p->type) {
409
410 case SOCKET_FIFO:
411 f = p->path;
412 break;
413
414 case SOCKET_SOCKET:
415 f = socket_address_get_path(&p->address);
416 break;
417
418 default:
419 break;
420 }
421
422 if (f) {
423 if (found)
424 return NULL;
425
426 found = f;
427 }
428 }
429
430 return found;
431 }
432
433 static int socket_verify(Socket *s) {
434 assert(s);
435
436 if (UNIT(s)->load_state != UNIT_LOADED)
437 return 0;
438
439 if (!s->ports) {
440 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
441 return -ENOEXEC;
442 }
443
444 if (s->accept && have_non_accept_socket(s)) {
445 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
446 return -ENOEXEC;
447 }
448
449 if (s->accept && s->max_connections <= 0) {
450 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
451 return -ENOEXEC;
452 }
453
454 if (s->accept && UNIT_DEREF(s->service)) {
455 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
456 return -ENOEXEC;
457 }
458
459 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
460 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
461 return -ENOEXEC;
462 }
463
464 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
465 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
466 return -ENOEXEC;
467 }
468
469 return 0;
470 }
471
472 static void peer_address_hash_func(const void *p, struct siphash *state) {
473 const SocketPeer *s = p;
474
475 assert(s);
476
477 if (s->peer.sa.sa_family == AF_INET)
478 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
479 else if (s->peer.sa.sa_family == AF_INET6)
480 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
481 else if (s->peer.sa.sa_family == AF_VSOCK)
482 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
483 else
484 assert_not_reached("Unknown address family.");
485 }
486
487 static int peer_address_compare_func(const void *a, const void *b) {
488 const SocketPeer *x = a, *y = b;
489 int r;
490
491 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
492 if (r != 0)
493 return r;
494
495 switch(x->peer.sa.sa_family) {
496 case AF_INET:
497 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
498 case AF_INET6:
499 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
500 case AF_VSOCK:
501 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
502 }
503 assert_not_reached("Black sheep in the family!");
504 }
505
506 const struct hash_ops peer_address_hash_ops = {
507 .hash = peer_address_hash_func,
508 .compare = peer_address_compare_func
509 };
510
511 static int socket_load(Unit *u) {
512 Socket *s = SOCKET(u);
513 int r;
514
515 assert(u);
516 assert(u->load_state == UNIT_STUB);
517
518 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
519 if (r < 0)
520 return r;
521
522 r = unit_load_fragment_and_dropin(u);
523 if (r < 0)
524 return r;
525
526 if (u->load_state == UNIT_LOADED) {
527 /* This is a new unit? Then let's add in some extras */
528 r = socket_add_extras(s);
529 if (r < 0)
530 return r;
531 }
532
533 return socket_verify(s);
534 }
535
536 static SocketPeer *socket_peer_new(void) {
537 SocketPeer *p;
538
539 p = new0(SocketPeer, 1);
540 if (!p)
541 return NULL;
542
543 p->n_ref = 1;
544
545 return p;
546 }
547
548 static SocketPeer *socket_peer_free(SocketPeer *p) {
549 assert(p);
550
551 if (p->socket)
552 set_remove(p->socket->peers_by_address, p);
553
554 return mfree(p);
555 }
556
557 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
558
559 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
560 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
561 SocketPeer sa = {}, *i;
562 socklen_t salen = sizeof(sa.peer);
563 int r;
564
565 assert(fd >= 0);
566 assert(s);
567
568 r = getpeername(fd, &sa.peer.sa, &salen);
569 if (r < 0)
570 return log_error_errno(errno, "getpeername failed: %m");
571
572 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
573 *p = NULL;
574 return 0;
575 }
576
577 i = set_get(s->peers_by_address, &sa);
578 if (i) {
579 *p = socket_peer_ref(i);
580 return 1;
581 }
582
583 remote = socket_peer_new();
584 if (!remote)
585 return log_oom();
586
587 remote->peer = sa.peer;
588 remote->peer_salen = salen;
589
590 r = set_put(s->peers_by_address, remote);
591 if (r < 0)
592 return r;
593
594 remote->socket = s;
595
596 *p = TAKE_PTR(remote);
597
598 return 1;
599 }
600
601 _const_ static const char* listen_lookup(int family, int type) {
602
603 if (family == AF_NETLINK)
604 return "ListenNetlink";
605
606 if (type == SOCK_STREAM)
607 return "ListenStream";
608 else if (type == SOCK_DGRAM)
609 return "ListenDatagram";
610 else if (type == SOCK_SEQPACKET)
611 return "ListenSequentialPacket";
612
613 assert_not_reached("Unknown socket type");
614 return NULL;
615 }
616
617 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
618 char time_string[FORMAT_TIMESPAN_MAX];
619 SocketExecCommand c;
620 Socket *s = SOCKET(u);
621 SocketPort *p;
622 const char *prefix2, *str;
623
624 assert(s);
625 assert(f);
626
627 prefix = strempty(prefix);
628 prefix2 = strjoina(prefix, "\t");
629
630 fprintf(f,
631 "%sSocket State: %s\n"
632 "%sResult: %s\n"
633 "%sBindIPv6Only: %s\n"
634 "%sBacklog: %u\n"
635 "%sSocketMode: %04o\n"
636 "%sDirectoryMode: %04o\n"
637 "%sKeepAlive: %s\n"
638 "%sNoDelay: %s\n"
639 "%sFreeBind: %s\n"
640 "%sTransparent: %s\n"
641 "%sBroadcast: %s\n"
642 "%sPassCredentials: %s\n"
643 "%sPassSecurity: %s\n"
644 "%sTCPCongestion: %s\n"
645 "%sRemoveOnStop: %s\n"
646 "%sWritable: %s\n"
647 "%sFileDescriptorName: %s\n"
648 "%sSELinuxContextFromNet: %s\n",
649 prefix, socket_state_to_string(s->state),
650 prefix, socket_result_to_string(s->result),
651 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
652 prefix, s->backlog,
653 prefix, s->socket_mode,
654 prefix, s->directory_mode,
655 prefix, yes_no(s->keep_alive),
656 prefix, yes_no(s->no_delay),
657 prefix, yes_no(s->free_bind),
658 prefix, yes_no(s->transparent),
659 prefix, yes_no(s->broadcast),
660 prefix, yes_no(s->pass_cred),
661 prefix, yes_no(s->pass_sec),
662 prefix, strna(s->tcp_congestion),
663 prefix, yes_no(s->remove_on_stop),
664 prefix, yes_no(s->writable),
665 prefix, socket_fdname(s),
666 prefix, yes_no(s->selinux_context_from_net));
667
668 if (s->control_pid > 0)
669 fprintf(f,
670 "%sControl PID: "PID_FMT"\n",
671 prefix, s->control_pid);
672
673 if (s->bind_to_device)
674 fprintf(f,
675 "%sBindToDevice: %s\n",
676 prefix, s->bind_to_device);
677
678 if (s->accept)
679 fprintf(f,
680 "%sAccepted: %u\n"
681 "%sNConnections: %u\n"
682 "%sMaxConnections: %u\n"
683 "%sMaxConnectionsPerSource: %u\n",
684 prefix, s->n_accepted,
685 prefix, s->n_connections,
686 prefix, s->max_connections,
687 prefix, s->max_connections_per_source);
688
689 if (s->priority >= 0)
690 fprintf(f,
691 "%sPriority: %i\n",
692 prefix, s->priority);
693
694 if (s->receive_buffer > 0)
695 fprintf(f,
696 "%sReceiveBuffer: %zu\n",
697 prefix, s->receive_buffer);
698
699 if (s->send_buffer > 0)
700 fprintf(f,
701 "%sSendBuffer: %zu\n",
702 prefix, s->send_buffer);
703
704 if (s->ip_tos >= 0)
705 fprintf(f,
706 "%sIPTOS: %i\n",
707 prefix, s->ip_tos);
708
709 if (s->ip_ttl >= 0)
710 fprintf(f,
711 "%sIPTTL: %i\n",
712 prefix, s->ip_ttl);
713
714 if (s->pipe_size > 0)
715 fprintf(f,
716 "%sPipeSize: %zu\n",
717 prefix, s->pipe_size);
718
719 if (s->mark >= 0)
720 fprintf(f,
721 "%sMark: %i\n",
722 prefix, s->mark);
723
724 if (s->mq_maxmsg > 0)
725 fprintf(f,
726 "%sMessageQueueMaxMessages: %li\n",
727 prefix, s->mq_maxmsg);
728
729 if (s->mq_msgsize > 0)
730 fprintf(f,
731 "%sMessageQueueMessageSize: %li\n",
732 prefix, s->mq_msgsize);
733
734 if (s->reuse_port)
735 fprintf(f,
736 "%sReusePort: %s\n",
737 prefix, yes_no(s->reuse_port));
738
739 if (s->smack)
740 fprintf(f,
741 "%sSmackLabel: %s\n",
742 prefix, s->smack);
743
744 if (s->smack_ip_in)
745 fprintf(f,
746 "%sSmackLabelIPIn: %s\n",
747 prefix, s->smack_ip_in);
748
749 if (s->smack_ip_out)
750 fprintf(f,
751 "%sSmackLabelIPOut: %s\n",
752 prefix, s->smack_ip_out);
753
754 if (!isempty(s->user) || !isempty(s->group))
755 fprintf(f,
756 "%sSocketUser: %s\n"
757 "%sSocketGroup: %s\n",
758 prefix, strna(s->user),
759 prefix, strna(s->group));
760
761 if (s->keep_alive_time > 0)
762 fprintf(f,
763 "%sKeepAliveTimeSec: %s\n",
764 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
765
766 if (s->keep_alive_interval > 0)
767 fprintf(f,
768 "%sKeepAliveIntervalSec: %s\n",
769 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
770
771 if (s->keep_alive_cnt > 0)
772 fprintf(f,
773 "%sKeepAliveProbes: %u\n",
774 prefix, s->keep_alive_cnt);
775
776 if (s->defer_accept > 0)
777 fprintf(f,
778 "%sDeferAcceptSec: %s\n",
779 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
780
781 LIST_FOREACH(port, p, s->ports) {
782
783 switch (p->type) {
784 case SOCKET_SOCKET: {
785 _cleanup_free_ char *k = NULL;
786 const char *t;
787 int r;
788
789 r = socket_address_print(&p->address, &k);
790 if (r < 0)
791 t = strerror(-r);
792 else
793 t = k;
794
795 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
796 break;
797 }
798 case SOCKET_SPECIAL:
799 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
800 break;
801 case SOCKET_USB_FUNCTION:
802 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
803 break;
804 case SOCKET_MQUEUE:
805 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
806 break;
807 default:
808 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
809 }
810 }
811
812 fprintf(f,
813 "%sTriggerLimitIntervalSec: %s\n"
814 "%sTriggerLimitBurst: %u\n",
815 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
816 prefix, s->trigger_limit.burst);
817
818 str = socket_protocol_to_name(s->socket_protocol);
819 if (str)
820 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
821
822 if (!strv_isempty(s->symlinks)) {
823 char **q;
824
825 fprintf(f, "%sSymlinks:", prefix);
826 STRV_FOREACH(q, s->symlinks)
827 fprintf(f, " %s", *q);
828
829 fprintf(f, "\n");
830 }
831
832 fprintf(f,
833 "%sTimeoutSec: %s\n",
834 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
835
836 exec_context_dump(&s->exec_context, f, prefix);
837 kill_context_dump(&s->kill_context, f, prefix);
838
839 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
840 if (!s->exec_command[c])
841 continue;
842
843 fprintf(f, "%s-> %s:\n",
844 prefix, socket_exec_command_to_string(c));
845
846 exec_command_dump_list(s->exec_command[c], f, prefix2);
847 }
848
849 cgroup_context_dump(&s->cgroup_context, f, prefix);
850 }
851
852 static int instance_from_socket(int fd, unsigned nr, char **instance) {
853 socklen_t l;
854 char *r;
855 union sockaddr_union local, remote;
856
857 assert(fd >= 0);
858 assert(instance);
859
860 l = sizeof(local);
861 if (getsockname(fd, &local.sa, &l) < 0)
862 return -errno;
863
864 l = sizeof(remote);
865 if (getpeername(fd, &remote.sa, &l) < 0)
866 return -errno;
867
868 switch (local.sa.sa_family) {
869
870 case AF_INET: {
871 uint32_t
872 a = be32toh(local.in.sin_addr.s_addr),
873 b = be32toh(remote.in.sin_addr.s_addr);
874
875 if (asprintf(&r,
876 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
877 nr,
878 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
879 be16toh(local.in.sin_port),
880 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
881 be16toh(remote.in.sin_port)) < 0)
882 return -ENOMEM;
883
884 break;
885 }
886
887 case AF_INET6: {
888 static const unsigned char ipv4_prefix[] = {
889 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
890 };
891
892 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
893 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
894 const uint8_t
895 *a = local.in6.sin6_addr.s6_addr+12,
896 *b = remote.in6.sin6_addr.s6_addr+12;
897
898 if (asprintf(&r,
899 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
900 nr,
901 a[0], a[1], a[2], a[3],
902 be16toh(local.in6.sin6_port),
903 b[0], b[1], b[2], b[3],
904 be16toh(remote.in6.sin6_port)) < 0)
905 return -ENOMEM;
906 } else {
907 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
908
909 if (asprintf(&r,
910 "%u-%s:%u-%s:%u",
911 nr,
912 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
913 be16toh(local.in6.sin6_port),
914 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
915 be16toh(remote.in6.sin6_port)) < 0)
916 return -ENOMEM;
917 }
918
919 break;
920 }
921
922 case AF_UNIX: {
923 struct ucred ucred;
924 int k;
925
926 k = getpeercred(fd, &ucred);
927 if (k >= 0) {
928 if (asprintf(&r,
929 "%u-"PID_FMT"-"UID_FMT,
930 nr, ucred.pid, ucred.uid) < 0)
931 return -ENOMEM;
932 } else if (k == -ENODATA) {
933 /* This handles the case where somebody is
934 * connecting from another pid/uid namespace
935 * (e.g. from outside of our container). */
936 if (asprintf(&r,
937 "%u-unknown",
938 nr) < 0)
939 return -ENOMEM;
940 } else
941 return k;
942
943 break;
944 }
945
946 case AF_VSOCK:
947 if (asprintf(&r,
948 "%u-%u:%u-%u:%u",
949 nr,
950 local.vm.svm_cid, local.vm.svm_port,
951 remote.vm.svm_cid, remote.vm.svm_port) < 0)
952 return -ENOMEM;
953
954 break;
955
956 default:
957 assert_not_reached("Unhandled socket type.");
958 }
959
960 *instance = r;
961 return 0;
962 }
963
964 static void socket_close_fds(Socket *s) {
965 SocketPort *p;
966 char **i;
967
968 assert(s);
969
970 LIST_FOREACH(port, p, s->ports) {
971 bool was_open;
972
973 was_open = p->fd >= 0;
974
975 p->event_source = sd_event_source_unref(p->event_source);
976 p->fd = safe_close(p->fd);
977 socket_cleanup_fd_list(p);
978
979 /* One little note: we should normally not delete any sockets in the file system here! After all some
980 * other process we spawned might still have a reference of this fd and wants to continue to use
981 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
982 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
983 * anyway, but only then. */
984
985 if (!was_open || !s->remove_on_stop)
986 continue;
987
988 switch (p->type) {
989
990 case SOCKET_FIFO:
991 (void) unlink(p->path);
992 break;
993
994 case SOCKET_MQUEUE:
995 (void) mq_unlink(p->path);
996 break;
997
998 case SOCKET_SOCKET:
999 (void) socket_address_unlink(&p->address);
1000 break;
1001
1002 default:
1003 break;
1004 }
1005 }
1006
1007 if (s->remove_on_stop)
1008 STRV_FOREACH(i, s->symlinks)
1009 (void) unlink(*i);
1010 }
1011
1012 static void socket_apply_socket_options(Socket *s, int fd) {
1013 int r;
1014
1015 assert(s);
1016 assert(fd >= 0);
1017
1018 if (s->keep_alive) {
1019 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
1020 if (r < 0)
1021 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
1022 }
1023
1024 if (s->keep_alive_time > 0) {
1025 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
1026 if (r < 0)
1027 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
1028 }
1029
1030 if (s->keep_alive_interval > 0) {
1031 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
1032 if (r < 0)
1033 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
1034 }
1035
1036 if (s->keep_alive_cnt > 0) {
1037 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1038 if (r < 0)
1039 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1040 }
1041
1042 if (s->defer_accept > 0) {
1043 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1044 if (r < 0)
1045 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1046 }
1047
1048 if (s->no_delay) {
1049 if (s->socket_protocol == IPPROTO_SCTP) {
1050 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1051 if (r < 0)
1052 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1053 } else {
1054 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1055 if (r < 0)
1056 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1057 }
1058 }
1059
1060 if (s->broadcast) {
1061 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1062 if (r < 0)
1063 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1064 }
1065
1066 if (s->pass_cred) {
1067 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1068 if (r < 0)
1069 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1070 }
1071
1072 if (s->pass_sec) {
1073 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1074 if (r < 0)
1075 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1076 }
1077
1078 if (s->priority >= 0) {
1079 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1080 if (r < 0)
1081 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1082 }
1083
1084 if (s->receive_buffer > 0) {
1085 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1086 if (setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, s->receive_buffer) < 0) {
1087 r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, s->receive_buffer);
1088 if (r < 0)
1089 log_unit_warning_errno(UNIT(s), r, "SO_RCVBUF failed: %m");
1090 }
1091 }
1092
1093 if (s->send_buffer > 0) {
1094 if (setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, s->send_buffer) < 0) {
1095 r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, s->send_buffer);
1096 if (r < 0)
1097 log_unit_warning_errno(UNIT(s), r, "SO_SNDBUF failed: %m");
1098 }
1099 }
1100
1101 if (s->mark >= 0) {
1102 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1103 if (r < 0)
1104 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1105 }
1106
1107 if (s->ip_tos >= 0) {
1108 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1109 if (r < 0)
1110 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1111 }
1112
1113 if (s->ip_ttl >= 0) {
1114 int x;
1115
1116 r = setsockopt_int(fd, IPPROTO_IP, IP_TTL, s->ip_ttl);
1117
1118 if (socket_ipv6_is_supported())
1119 x = setsockopt_int(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, s->ip_ttl);
1120 else
1121 x = -EAFNOSUPPORT;
1122
1123 if (r < 0 && x < 0)
1124 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1125 }
1126
1127 if (s->tcp_congestion)
1128 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1129 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1130
1131 if (s->smack_ip_in) {
1132 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1133 if (r < 0)
1134 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1135 }
1136
1137 if (s->smack_ip_out) {
1138 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1139 if (r < 0)
1140 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1141 }
1142 }
1143
1144 static void socket_apply_fifo_options(Socket *s, int fd) {
1145 int r;
1146
1147 assert(s);
1148 assert(fd >= 0);
1149
1150 if (s->pipe_size > 0)
1151 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1152 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1153
1154 if (s->smack) {
1155 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1156 if (r < 0)
1157 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1158 }
1159 }
1160
1161 static int fifo_address_create(
1162 const char *path,
1163 mode_t directory_mode,
1164 mode_t socket_mode) {
1165
1166 _cleanup_close_ int fd = -1;
1167 mode_t old_mask;
1168 struct stat st;
1169 int r;
1170
1171 assert(path);
1172
1173 (void) mkdir_parents_label(path, directory_mode);
1174
1175 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1176 if (r < 0)
1177 return r;
1178
1179 /* Enforce the right access mode for the fifo */
1180 old_mask = umask(~socket_mode);
1181
1182 /* Include the original umask in our mask */
1183 (void) umask(~socket_mode | old_mask);
1184
1185 r = mkfifo(path, socket_mode);
1186 (void) umask(old_mask);
1187
1188 if (r < 0 && errno != EEXIST) {
1189 r = -errno;
1190 goto fail;
1191 }
1192
1193 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1194 if (fd < 0) {
1195 r = -errno;
1196 goto fail;
1197 }
1198
1199 mac_selinux_create_file_clear();
1200
1201 if (fstat(fd, &st) < 0) {
1202 r = -errno;
1203 goto fail;
1204 }
1205
1206 if (!S_ISFIFO(st.st_mode) ||
1207 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1208 st.st_uid != getuid() ||
1209 st.st_gid != getgid()) {
1210 r = -EEXIST;
1211 goto fail;
1212 }
1213
1214 return TAKE_FD(fd);
1215
1216 fail:
1217 mac_selinux_create_file_clear();
1218 return r;
1219 }
1220
1221 static int special_address_create(const char *path, bool writable) {
1222 _cleanup_close_ int fd = -1;
1223 struct stat st;
1224
1225 assert(path);
1226
1227 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1228 if (fd < 0)
1229 return -errno;
1230
1231 if (fstat(fd, &st) < 0)
1232 return -errno;
1233
1234 /* Check whether this is a /proc, /sys or /dev file or char device */
1235 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1236 return -EEXIST;
1237
1238 return TAKE_FD(fd);
1239 }
1240
1241 static int usbffs_address_create(const char *path) {
1242 _cleanup_close_ int fd = -1;
1243 struct stat st;
1244
1245 assert(path);
1246
1247 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1248 if (fd < 0)
1249 return -errno;
1250
1251 if (fstat(fd, &st) < 0)
1252 return -errno;
1253
1254 /* Check whether this is a regular file (ffs endpoint) */
1255 if (!S_ISREG(st.st_mode))
1256 return -EEXIST;
1257
1258 return TAKE_FD(fd);
1259 }
1260
1261 static int mq_address_create(
1262 const char *path,
1263 mode_t mq_mode,
1264 long maxmsg,
1265 long msgsize) {
1266
1267 _cleanup_close_ int fd = -1;
1268 struct stat st;
1269 mode_t old_mask;
1270 struct mq_attr _attr, *attr = NULL;
1271
1272 assert(path);
1273
1274 if (maxmsg > 0 && msgsize > 0) {
1275 _attr = (struct mq_attr) {
1276 .mq_flags = O_NONBLOCK,
1277 .mq_maxmsg = maxmsg,
1278 .mq_msgsize = msgsize,
1279 };
1280 attr = &_attr;
1281 }
1282
1283 /* Enforce the right access mode for the mq */
1284 old_mask = umask(~mq_mode);
1285
1286 /* Include the original umask in our mask */
1287 (void) umask(~mq_mode | old_mask);
1288 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1289 (void) umask(old_mask);
1290
1291 if (fd < 0)
1292 return -errno;
1293
1294 if (fstat(fd, &st) < 0)
1295 return -errno;
1296
1297 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1298 st.st_uid != getuid() ||
1299 st.st_gid != getgid())
1300 return -EEXIST;
1301
1302 return TAKE_FD(fd);
1303 }
1304
1305 static int socket_symlink(Socket *s) {
1306 const char *p;
1307 char **i;
1308 int r;
1309
1310 assert(s);
1311
1312 p = socket_find_symlink_target(s);
1313 if (!p)
1314 return 0;
1315
1316 STRV_FOREACH(i, s->symlinks) {
1317 (void) mkdir_parents_label(*i, s->directory_mode);
1318
1319 r = symlink_idempotent(p, *i, false);
1320
1321 if (r == -EEXIST && s->remove_on_stop) {
1322 /* If there's already something where we want to create the symlink, and the destructive
1323 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1324 * again. */
1325
1326 if (unlink(*i) >= 0)
1327 r = symlink_idempotent(p, *i, false);
1328 }
1329
1330 if (r < 0)
1331 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1332 }
1333
1334 return 0;
1335 }
1336
1337 static int usbffs_write_descs(int fd, Service *s) {
1338 int r;
1339
1340 if (!s->usb_function_descriptors || !s->usb_function_strings)
1341 return -EINVAL;
1342
1343 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1344 if (r < 0)
1345 return r;
1346
1347 return copy_file_fd(s->usb_function_strings, fd, 0);
1348 }
1349
1350 static int usbffs_select_ep(const struct dirent *d) {
1351 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1352 }
1353
1354 static int usbffs_dispatch_eps(SocketPort *p) {
1355 _cleanup_free_ struct dirent **ent = NULL;
1356 size_t n, k, i;
1357 int r;
1358
1359 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1360 if (r < 0)
1361 return -errno;
1362
1363 n = (size_t) r;
1364 p->auxiliary_fds = new(int, n);
1365 if (!p->auxiliary_fds) {
1366 r = -ENOMEM;
1367 goto clear;
1368 }
1369
1370 p->n_auxiliary_fds = n;
1371
1372 k = 0;
1373 for (i = 0; i < n; ++i) {
1374 _cleanup_free_ char *ep = NULL;
1375
1376 ep = path_make_absolute(ent[i]->d_name, p->path);
1377 if (!ep) {
1378 r = -ENOMEM;
1379 goto fail;
1380 }
1381
1382 path_simplify(ep, false);
1383
1384 r = usbffs_address_create(ep);
1385 if (r < 0)
1386 goto fail;
1387
1388 p->auxiliary_fds[k++] = r;
1389 }
1390
1391 r = 0;
1392 goto clear;
1393
1394 fail:
1395 close_many(p->auxiliary_fds, k);
1396 p->auxiliary_fds = mfree(p->auxiliary_fds);
1397 p->n_auxiliary_fds = 0;
1398
1399 clear:
1400 for (i = 0; i < n; ++i)
1401 free(ent[i]);
1402
1403 return r;
1404 }
1405
1406 static int socket_determine_selinux_label(Socket *s, char **ret) {
1407 Service *service;
1408 ExecCommand *c;
1409 _cleanup_free_ char *path = NULL;
1410 int r;
1411
1412 assert(s);
1413 assert(ret);
1414
1415 if (s->selinux_context_from_net) {
1416 /* If this is requested, get label from the network label */
1417
1418 r = mac_selinux_get_our_label(ret);
1419 if (r == -EOPNOTSUPP)
1420 goto no_label;
1421
1422 } else {
1423 /* Otherwise, get it from the executable we are about to start */
1424 r = socket_instantiate_service(s);
1425 if (r < 0)
1426 return r;
1427
1428 if (!UNIT_ISSET(s->service))
1429 goto no_label;
1430
1431 service = SERVICE(UNIT_DEREF(s->service));
1432 c = service->exec_command[SERVICE_EXEC_START];
1433 if (!c)
1434 goto no_label;
1435
1436 r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
1437 if (r < 0)
1438 goto no_label;
1439
1440 r = mac_selinux_get_create_label_from_exe(path, ret);
1441 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1442 goto no_label;
1443 }
1444
1445 return r;
1446
1447 no_label:
1448 *ret = NULL;
1449 return 0;
1450 }
1451
1452 static int socket_address_listen_do(
1453 Socket *s,
1454 const SocketAddress *address,
1455 const char *label) {
1456
1457 assert(s);
1458 assert(address);
1459
1460 return socket_address_listen(
1461 address,
1462 SOCK_CLOEXEC|SOCK_NONBLOCK,
1463 s->backlog,
1464 s->bind_ipv6_only,
1465 s->bind_to_device,
1466 s->reuse_port,
1467 s->free_bind,
1468 s->transparent,
1469 s->directory_mode,
1470 s->socket_mode,
1471 label);
1472 }
1473
1474 static int socket_address_listen_in_cgroup(
1475 Socket *s,
1476 const SocketAddress *address,
1477 const char *label) {
1478
1479 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1480 int fd, r;
1481 pid_t pid;
1482
1483 assert(s);
1484 assert(address);
1485
1486 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1487 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1488 * unit's cgroup for the purpose of BPF filtering and such. */
1489
1490 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1491 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1492
1493 r = bpf_firewall_supported();
1494 if (r < 0)
1495 return r;
1496 if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1497 goto shortcut;
1498
1499 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1500 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1501
1502 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1503 if (r < 0)
1504 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1505 if (r == 0) {
1506 /* Child */
1507
1508 pair[0] = safe_close(pair[0]);
1509
1510 fd = socket_address_listen_do(s, address, label);
1511 if (fd < 0) {
1512 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1513 _exit(EXIT_FAILURE);
1514 }
1515
1516 r = send_one_fd(pair[1], fd, 0);
1517 if (r < 0) {
1518 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1519 _exit(EXIT_FAILURE);
1520 }
1521
1522 _exit(EXIT_SUCCESS);
1523 }
1524
1525 pair[1] = safe_close(pair[1]);
1526 fd = receive_one_fd(pair[0], 0);
1527
1528 /* We synchronously wait for the helper, as it shouldn't be slow */
1529 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1530 if (r < 0) {
1531 safe_close(fd);
1532 return r;
1533 }
1534
1535 if (fd < 0)
1536 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1537
1538 return fd;
1539
1540 shortcut:
1541 fd = socket_address_listen_do(s, address, label);
1542 if (fd < 0)
1543 return log_error_errno(fd, "Failed to create listening socket: %m");
1544
1545 return fd;
1546 }
1547
1548 static int socket_open_fds(Socket *s) {
1549 _cleanup_(mac_selinux_freep) char *label = NULL;
1550 bool know_label = false;
1551 SocketPort *p;
1552 int r;
1553
1554 assert(s);
1555
1556 LIST_FOREACH(port, p, s->ports) {
1557
1558 if (p->fd >= 0)
1559 continue;
1560
1561 switch (p->type) {
1562
1563 case SOCKET_SOCKET:
1564
1565 if (!know_label) {
1566 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1567 * we need this and remember it for the rest. */
1568
1569 r = socket_determine_selinux_label(s, &label);
1570 if (r < 0)
1571 goto rollback;
1572
1573 know_label = true;
1574 }
1575
1576 /* Apply the socket protocol */
1577 switch (p->address.type) {
1578
1579 case SOCK_STREAM:
1580 case SOCK_SEQPACKET:
1581 if (s->socket_protocol == IPPROTO_SCTP)
1582 p->address.protocol = s->socket_protocol;
1583 break;
1584
1585 case SOCK_DGRAM:
1586 if (s->socket_protocol == IPPROTO_UDPLITE)
1587 p->address.protocol = s->socket_protocol;
1588 break;
1589 }
1590
1591 r = socket_address_listen_in_cgroup(s, &p->address, label);
1592 if (r < 0)
1593 goto rollback;
1594
1595 p->fd = r;
1596 socket_apply_socket_options(s, p->fd);
1597 socket_symlink(s);
1598 break;
1599
1600 case SOCKET_SPECIAL:
1601
1602 p->fd = special_address_create(p->path, s->writable);
1603 if (p->fd < 0) {
1604 r = p->fd;
1605 goto rollback;
1606 }
1607 break;
1608
1609 case SOCKET_FIFO:
1610
1611 p->fd = fifo_address_create(
1612 p->path,
1613 s->directory_mode,
1614 s->socket_mode);
1615 if (p->fd < 0) {
1616 r = p->fd;
1617 goto rollback;
1618 }
1619
1620 socket_apply_fifo_options(s, p->fd);
1621 socket_symlink(s);
1622 break;
1623
1624 case SOCKET_MQUEUE:
1625
1626 p->fd = mq_address_create(
1627 p->path,
1628 s->socket_mode,
1629 s->mq_maxmsg,
1630 s->mq_msgsize);
1631 if (p->fd < 0) {
1632 r = p->fd;
1633 goto rollback;
1634 }
1635 break;
1636
1637 case SOCKET_USB_FUNCTION: {
1638 _cleanup_free_ char *ep = NULL;
1639
1640 ep = path_make_absolute("ep0", p->path);
1641
1642 p->fd = usbffs_address_create(ep);
1643 if (p->fd < 0) {
1644 r = p->fd;
1645 goto rollback;
1646 }
1647
1648 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1649 if (r < 0)
1650 goto rollback;
1651
1652 r = usbffs_dispatch_eps(p);
1653 if (r < 0)
1654 goto rollback;
1655
1656 break;
1657 }
1658 default:
1659 assert_not_reached("Unknown port type");
1660 }
1661 }
1662
1663 return 0;
1664
1665 rollback:
1666 socket_close_fds(s);
1667 return r;
1668 }
1669
1670 static void socket_unwatch_fds(Socket *s) {
1671 SocketPort *p;
1672 int r;
1673
1674 assert(s);
1675
1676 LIST_FOREACH(port, p, s->ports) {
1677 if (p->fd < 0)
1678 continue;
1679
1680 if (!p->event_source)
1681 continue;
1682
1683 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1684 if (r < 0)
1685 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1686 }
1687 }
1688
1689 static int socket_watch_fds(Socket *s) {
1690 SocketPort *p;
1691 int r;
1692
1693 assert(s);
1694
1695 LIST_FOREACH(port, p, s->ports) {
1696 if (p->fd < 0)
1697 continue;
1698
1699 if (p->event_source) {
1700 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1701 if (r < 0)
1702 goto fail;
1703 } else {
1704 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1705 if (r < 0)
1706 goto fail;
1707
1708 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1709 }
1710 }
1711
1712 return 0;
1713
1714 fail:
1715 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1716 socket_unwatch_fds(s);
1717 return r;
1718 }
1719
1720 enum {
1721 SOCKET_OPEN_NONE,
1722 SOCKET_OPEN_SOME,
1723 SOCKET_OPEN_ALL,
1724 };
1725
1726 static int socket_check_open(Socket *s) {
1727 bool have_open = false, have_closed = false;
1728 SocketPort *p;
1729
1730 assert(s);
1731
1732 LIST_FOREACH(port, p, s->ports) {
1733 if (p->fd < 0)
1734 have_closed = true;
1735 else
1736 have_open = true;
1737
1738 if (have_open && have_closed)
1739 return SOCKET_OPEN_SOME;
1740 }
1741
1742 if (have_open)
1743 return SOCKET_OPEN_ALL;
1744
1745 return SOCKET_OPEN_NONE;
1746 }
1747
1748 static void socket_set_state(Socket *s, SocketState state) {
1749 SocketState old_state;
1750 assert(s);
1751
1752 if (s->state != state)
1753 bus_unit_send_pending_change_signal(UNIT(s), false);
1754
1755 old_state = s->state;
1756 s->state = state;
1757
1758 if (!IN_SET(state,
1759 SOCKET_START_PRE,
1760 SOCKET_START_CHOWN,
1761 SOCKET_START_POST,
1762 SOCKET_STOP_PRE,
1763 SOCKET_STOP_PRE_SIGTERM,
1764 SOCKET_STOP_PRE_SIGKILL,
1765 SOCKET_STOP_POST,
1766 SOCKET_FINAL_SIGTERM,
1767 SOCKET_FINAL_SIGKILL)) {
1768
1769 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1770 socket_unwatch_control_pid(s);
1771 s->control_command = NULL;
1772 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1773 }
1774
1775 if (state != SOCKET_LISTENING)
1776 socket_unwatch_fds(s);
1777
1778 if (!IN_SET(state,
1779 SOCKET_START_CHOWN,
1780 SOCKET_START_POST,
1781 SOCKET_LISTENING,
1782 SOCKET_RUNNING,
1783 SOCKET_STOP_PRE,
1784 SOCKET_STOP_PRE_SIGTERM,
1785 SOCKET_STOP_PRE_SIGKILL))
1786 socket_close_fds(s);
1787
1788 if (state != old_state)
1789 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1790
1791 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1792 }
1793
1794 static int socket_coldplug(Unit *u) {
1795 Socket *s = SOCKET(u);
1796 int r;
1797
1798 assert(s);
1799 assert(s->state == SOCKET_DEAD);
1800
1801 if (s->deserialized_state == s->state)
1802 return 0;
1803
1804 if (s->control_pid > 0 &&
1805 pid_is_unwaited(s->control_pid) &&
1806 IN_SET(s->deserialized_state,
1807 SOCKET_START_PRE,
1808 SOCKET_START_CHOWN,
1809 SOCKET_START_POST,
1810 SOCKET_STOP_PRE,
1811 SOCKET_STOP_PRE_SIGTERM,
1812 SOCKET_STOP_PRE_SIGKILL,
1813 SOCKET_STOP_POST,
1814 SOCKET_FINAL_SIGTERM,
1815 SOCKET_FINAL_SIGKILL)) {
1816
1817 r = unit_watch_pid(UNIT(s), s->control_pid);
1818 if (r < 0)
1819 return r;
1820
1821 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1822 if (r < 0)
1823 return r;
1824 }
1825
1826 if (IN_SET(s->deserialized_state,
1827 SOCKET_START_CHOWN,
1828 SOCKET_START_POST,
1829 SOCKET_LISTENING,
1830 SOCKET_RUNNING)) {
1831
1832 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1833 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1834 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1835 * and if there's a mismatch, warn loudly. */
1836
1837 r = socket_check_open(s);
1838 if (r == SOCKET_OPEN_NONE)
1839 log_unit_warning(UNIT(s),
1840 "Socket unit configuration has changed while unit has been running, "
1841 "no open socket file descriptor left. "
1842 "The socket unit is not functional until restarted.");
1843 else if (r == SOCKET_OPEN_SOME)
1844 log_unit_warning(UNIT(s),
1845 "Socket unit configuration has changed while unit has been running, "
1846 "and some socket file descriptors have not been opened yet. "
1847 "The socket unit is not fully functional until restarted.");
1848 }
1849
1850 if (s->deserialized_state == SOCKET_LISTENING) {
1851 r = socket_watch_fds(s);
1852 if (r < 0)
1853 return r;
1854 }
1855
1856 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
1857 (void) unit_setup_dynamic_creds(u);
1858 (void) unit_setup_exec_runtime(u);
1859 }
1860
1861 socket_set_state(s, s->deserialized_state);
1862 return 0;
1863 }
1864
1865 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1866
1867 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1868 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1869 .stdin_fd = -1,
1870 .stdout_fd = -1,
1871 .stderr_fd = -1,
1872 .exec_fd = -1,
1873 };
1874 pid_t pid;
1875 int r;
1876
1877 assert(s);
1878 assert(c);
1879 assert(_pid);
1880
1881 r = unit_prepare_exec(UNIT(s));
1882 if (r < 0)
1883 return r;
1884
1885 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1886 if (r < 0)
1887 return r;
1888
1889 r = unit_set_exec_params(UNIT(s), &exec_params);
1890 if (r < 0)
1891 return r;
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, 0);
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, 0);
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 unit_log_success(UNIT(s));
1994 else
1995 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
1996
1997 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1998
1999 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2000
2001 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
2002
2003 unit_unref_uid_gid(UNIT(s), true);
2004
2005 dynamic_creds_destroy(&s->dynamic_creds);
2006 }
2007
2008 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2009
2010 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2011 int r;
2012 assert(s);
2013
2014 if (s->result == SOCKET_SUCCESS)
2015 s->result = f;
2016
2017 socket_unwatch_control_pid(s);
2018 s->control_command_id = SOCKET_EXEC_STOP_POST;
2019 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2020
2021 if (s->control_command) {
2022 r = socket_spawn(s, s->control_command, &s->control_pid);
2023 if (r < 0)
2024 goto fail;
2025
2026 socket_set_state(s, SOCKET_STOP_POST);
2027 } else
2028 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2029
2030 return;
2031
2032 fail:
2033 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2034 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2035 }
2036
2037 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2038 int r;
2039
2040 assert(s);
2041
2042 if (s->result == SOCKET_SUCCESS)
2043 s->result = f;
2044
2045 r = unit_kill_context(
2046 UNIT(s),
2047 &s->kill_context,
2048 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2049 KILL_KILL : KILL_TERMINATE,
2050 -1,
2051 s->control_pid,
2052 false);
2053 if (r < 0)
2054 goto fail;
2055
2056 if (r > 0) {
2057 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2058 if (r < 0)
2059 goto fail;
2060
2061 socket_set_state(s, state);
2062 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2063 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2064 else if (state == SOCKET_STOP_PRE_SIGKILL)
2065 socket_enter_stop_post(s, SOCKET_SUCCESS);
2066 else if (state == SOCKET_FINAL_SIGTERM)
2067 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2068 else
2069 socket_enter_dead(s, SOCKET_SUCCESS);
2070
2071 return;
2072
2073 fail:
2074 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2075
2076 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2077 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2078 else
2079 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2080 }
2081
2082 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2083 int r;
2084 assert(s);
2085
2086 if (s->result == SOCKET_SUCCESS)
2087 s->result = f;
2088
2089 socket_unwatch_control_pid(s);
2090 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2091 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2092
2093 if (s->control_command) {
2094 r = socket_spawn(s, s->control_command, &s->control_pid);
2095 if (r < 0)
2096 goto fail;
2097
2098 socket_set_state(s, SOCKET_STOP_PRE);
2099 } else
2100 socket_enter_stop_post(s, SOCKET_SUCCESS);
2101
2102 return;
2103
2104 fail:
2105 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2106 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2107 }
2108
2109 static void socket_enter_listening(Socket *s) {
2110 int r;
2111 assert(s);
2112
2113 r = socket_watch_fds(s);
2114 if (r < 0) {
2115 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2116 goto fail;
2117 }
2118
2119 socket_set_state(s, SOCKET_LISTENING);
2120 return;
2121
2122 fail:
2123 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2124 }
2125
2126 static void socket_enter_start_post(Socket *s) {
2127 int r;
2128 assert(s);
2129
2130 socket_unwatch_control_pid(s);
2131 s->control_command_id = SOCKET_EXEC_START_POST;
2132 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2133
2134 if (s->control_command) {
2135 r = socket_spawn(s, s->control_command, &s->control_pid);
2136 if (r < 0) {
2137 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2138 goto fail;
2139 }
2140
2141 socket_set_state(s, SOCKET_START_POST);
2142 } else
2143 socket_enter_listening(s);
2144
2145 return;
2146
2147 fail:
2148 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2149 }
2150
2151 static void socket_enter_start_chown(Socket *s) {
2152 int r;
2153
2154 assert(s);
2155
2156 r = socket_open_fds(s);
2157 if (r < 0) {
2158 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2159 goto fail;
2160 }
2161
2162 if (!isempty(s->user) || !isempty(s->group)) {
2163
2164 socket_unwatch_control_pid(s);
2165 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2166 s->control_command = NULL;
2167
2168 r = socket_chown(s, &s->control_pid);
2169 if (r < 0) {
2170 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2171 goto fail;
2172 }
2173
2174 socket_set_state(s, SOCKET_START_CHOWN);
2175 } else
2176 socket_enter_start_post(s);
2177
2178 return;
2179
2180 fail:
2181 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2182 }
2183
2184 static void socket_enter_start_pre(Socket *s) {
2185 int r;
2186 assert(s);
2187
2188 socket_unwatch_control_pid(s);
2189
2190 unit_warn_leftover_processes(UNIT(s));
2191
2192 s->control_command_id = SOCKET_EXEC_START_PRE;
2193 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2194
2195 if (s->control_command) {
2196 r = socket_spawn(s, s->control_command, &s->control_pid);
2197 if (r < 0) {
2198 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2199 goto fail;
2200 }
2201
2202 socket_set_state(s, SOCKET_START_PRE);
2203 } else
2204 socket_enter_start_chown(s);
2205
2206 return;
2207
2208 fail:
2209 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2210 }
2211
2212 static void flush_ports(Socket *s) {
2213 SocketPort *p;
2214
2215 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2216 * anymore */
2217
2218 LIST_FOREACH(port, p, s->ports) {
2219 if (p->fd < 0)
2220 continue;
2221
2222 (void) flush_accept(p->fd);
2223 (void) flush_fd(p->fd);
2224 }
2225 }
2226
2227 static void socket_enter_running(Socket *s, int cfd) {
2228 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2229 int r;
2230
2231 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2232 * close it. */
2233
2234 assert(s);
2235
2236 /* We don't take connections anymore if we are supposed to shut down anyway */
2237 if (unit_stop_pending(UNIT(s))) {
2238
2239 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2240
2241 if (cfd >= 0)
2242 goto refuse;
2243 else
2244 flush_ports(s);
2245
2246 return;
2247 }
2248
2249 if (!ratelimit_below(&s->trigger_limit)) {
2250 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2251 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2252 goto refuse;
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 goto refuse;
2291 }
2292
2293 if (s->max_connections_per_source > 0) {
2294 r = socket_acquire_peer(s, cfd, &p);
2295 if (r < 0) {
2296 goto refuse;
2297 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2298 _cleanup_free_ char *t = NULL;
2299
2300 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2301
2302 log_unit_warning(UNIT(s),
2303 "Too many incoming connections (%u) from source %s, dropping connection.",
2304 p->n_ref, strnull(t));
2305 goto refuse;
2306 }
2307 }
2308
2309 r = socket_instantiate_service(s);
2310 if (r < 0)
2311 goto fail;
2312
2313 r = instance_from_socket(cfd, s->n_accepted, &instance);
2314 if (r < 0) {
2315 if (r != -ENOTCONN)
2316 goto fail;
2317
2318 /* ENOTCONN is legitimate if TCP RST was received.
2319 * This connection is over, but the socket unit lives on. */
2320 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2321 goto refuse;
2322 }
2323
2324 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2325 if (r < 0)
2326 goto fail;
2327
2328 r = unit_name_build(prefix, instance, ".service", &name);
2329 if (r < 0)
2330 goto fail;
2331
2332 r = unit_add_name(UNIT_DEREF(s->service), name);
2333 if (r < 0)
2334 goto fail;
2335
2336 service = SERVICE(UNIT_DEREF(s->service));
2337 unit_ref_unset(&s->service);
2338
2339 s->n_accepted++;
2340 unit_choose_id(UNIT(service), name);
2341
2342 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2343 if (r < 0)
2344 goto fail;
2345
2346 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2347 s->n_connections++;
2348
2349 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2350
2351 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2352 if (r < 0) {
2353 /* We failed to activate the new service, but it still exists. Let's make sure the service
2354 * closes and forgets the connection fd again, immediately. */
2355 service_close_socket_fd(service);
2356 goto fail;
2357 }
2358
2359 /* Notify clients about changed counters */
2360 unit_add_to_dbus_queue(UNIT(s));
2361 }
2362
2363 return;
2364
2365 refuse:
2366 s->n_refused++;
2367 safe_close(cfd);
2368 return;
2369
2370 fail:
2371 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2372 cfd >= 0 ? "template" : "non-template",
2373 bus_error_message(&error, r));
2374
2375 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2376 safe_close(cfd);
2377 }
2378
2379 static void socket_run_next(Socket *s) {
2380 int r;
2381
2382 assert(s);
2383 assert(s->control_command);
2384 assert(s->control_command->command_next);
2385
2386 socket_unwatch_control_pid(s);
2387
2388 s->control_command = s->control_command->command_next;
2389
2390 r = socket_spawn(s, s->control_command, &s->control_pid);
2391 if (r < 0)
2392 goto fail;
2393
2394 return;
2395
2396 fail:
2397 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2398
2399 if (s->state == SOCKET_START_POST)
2400 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2401 else if (s->state == SOCKET_STOP_POST)
2402 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2403 else
2404 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2405 }
2406
2407 static int socket_start(Unit *u) {
2408 Socket *s = SOCKET(u);
2409 int r;
2410
2411 assert(s);
2412
2413 /* We cannot fulfill this request right now, try again later
2414 * please! */
2415 if (IN_SET(s->state,
2416 SOCKET_STOP_PRE,
2417 SOCKET_STOP_PRE_SIGKILL,
2418 SOCKET_STOP_PRE_SIGTERM,
2419 SOCKET_STOP_POST,
2420 SOCKET_FINAL_SIGTERM,
2421 SOCKET_FINAL_SIGKILL))
2422 return -EAGAIN;
2423
2424 /* Already on it! */
2425 if (IN_SET(s->state,
2426 SOCKET_START_PRE,
2427 SOCKET_START_CHOWN,
2428 SOCKET_START_POST))
2429 return 0;
2430
2431 /* Cannot run this without the service being around */
2432 if (UNIT_ISSET(s->service)) {
2433 Service *service;
2434
2435 service = SERVICE(UNIT_DEREF(s->service));
2436
2437 if (UNIT(service)->load_state != UNIT_LOADED) {
2438 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2439 return -ENOENT;
2440 }
2441
2442 /* If the service is already active we cannot start the
2443 * socket */
2444 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2445 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2446 return -EBUSY;
2447 }
2448 }
2449
2450 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2451
2452 r = unit_start_limit_test(u);
2453 if (r < 0) {
2454 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2455 return r;
2456 }
2457
2458 r = unit_acquire_invocation_id(u);
2459 if (r < 0)
2460 return r;
2461
2462 s->result = SOCKET_SUCCESS;
2463 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2464
2465 u->reset_accounting = true;
2466
2467 socket_enter_start_pre(s);
2468 return 1;
2469 }
2470
2471 static int socket_stop(Unit *u) {
2472 Socket *s = SOCKET(u);
2473
2474 assert(s);
2475
2476 /* Already on it */
2477 if (IN_SET(s->state,
2478 SOCKET_STOP_PRE,
2479 SOCKET_STOP_PRE_SIGTERM,
2480 SOCKET_STOP_PRE_SIGKILL,
2481 SOCKET_STOP_POST,
2482 SOCKET_FINAL_SIGTERM,
2483 SOCKET_FINAL_SIGKILL))
2484 return 0;
2485
2486 /* If there's already something running we go directly into
2487 * kill mode. */
2488 if (IN_SET(s->state,
2489 SOCKET_START_PRE,
2490 SOCKET_START_CHOWN,
2491 SOCKET_START_POST)) {
2492 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2493 return -EAGAIN;
2494 }
2495
2496 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2497
2498 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2499 return 1;
2500 }
2501
2502 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2503 Socket *s = SOCKET(u);
2504 SocketPort *p;
2505 int r;
2506
2507 assert(u);
2508 assert(f);
2509 assert(fds);
2510
2511 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2512 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2513 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2514 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2515
2516 if (s->control_pid > 0)
2517 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2518
2519 if (s->control_command_id >= 0)
2520 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2521
2522 LIST_FOREACH(port, p, s->ports) {
2523 int copy;
2524
2525 if (p->fd < 0)
2526 continue;
2527
2528 copy = fdset_put_dup(fds, p->fd);
2529 if (copy < 0)
2530 return log_warning_errno(copy, "Failed to serialize socket fd: %m");
2531
2532 if (p->type == SOCKET_SOCKET) {
2533 _cleanup_free_ char *t = NULL;
2534
2535 r = socket_address_print(&p->address, &t);
2536 if (r < 0)
2537 return log_error_errno(r, "Failed to format socket address: %m");
2538
2539 if (socket_address_family(&p->address) == AF_NETLINK)
2540 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2541 else
2542 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2543 } else if (p->type == SOCKET_SPECIAL)
2544 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2545 else if (p->type == SOCKET_MQUEUE)
2546 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2547 else if (p->type == SOCKET_USB_FUNCTION)
2548 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2549 else {
2550 assert(p->type == SOCKET_FIFO);
2551 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2552 }
2553 }
2554
2555 return 0;
2556 }
2557
2558 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2559 assert(p);
2560
2561 safe_close(p->fd);
2562 p->fd = fdset_remove(fds, fd);
2563 }
2564
2565 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2566 Socket *s = SOCKET(u);
2567
2568 assert(u);
2569 assert(key);
2570 assert(value);
2571
2572 if (streq(key, "state")) {
2573 SocketState state;
2574
2575 state = socket_state_from_string(value);
2576 if (state < 0)
2577 log_unit_debug(u, "Failed to parse state value: %s", value);
2578 else
2579 s->deserialized_state = state;
2580 } else if (streq(key, "result")) {
2581 SocketResult f;
2582
2583 f = socket_result_from_string(value);
2584 if (f < 0)
2585 log_unit_debug(u, "Failed to parse result value: %s", value);
2586 else if (f != SOCKET_SUCCESS)
2587 s->result = f;
2588
2589 } else if (streq(key, "n-accepted")) {
2590 unsigned k;
2591
2592 if (safe_atou(value, &k) < 0)
2593 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2594 else
2595 s->n_accepted += k;
2596 } else if (streq(key, "n-refused")) {
2597 unsigned k;
2598
2599 if (safe_atou(value, &k) < 0)
2600 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2601 else
2602 s->n_refused += k;
2603 } else if (streq(key, "control-pid")) {
2604 pid_t pid;
2605
2606 if (parse_pid(value, &pid) < 0)
2607 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2608 else
2609 s->control_pid = pid;
2610 } else if (streq(key, "control-command")) {
2611 SocketExecCommand id;
2612
2613 id = socket_exec_command_from_string(value);
2614 if (id < 0)
2615 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2616 else {
2617 s->control_command_id = id;
2618 s->control_command = s->exec_command[id];
2619 }
2620 } else if (streq(key, "fifo")) {
2621 int fd, skip = 0;
2622 SocketPort *p;
2623
2624 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2625 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2626 else
2627 LIST_FOREACH(port, p, s->ports)
2628 if (p->type == SOCKET_FIFO &&
2629 path_equal_or_files_same(p->path, value+skip, 0)) {
2630 socket_port_take_fd(p, fds, fd);
2631 break;
2632 }
2633
2634 } else if (streq(key, "special")) {
2635 int fd, skip = 0;
2636 SocketPort *p;
2637
2638 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2639 log_unit_debug(u, "Failed to parse special value: %s", value);
2640 else
2641 LIST_FOREACH(port, p, s->ports)
2642 if (p->type == SOCKET_SPECIAL &&
2643 path_equal_or_files_same(p->path, value+skip, 0)) {
2644 socket_port_take_fd(p, fds, fd);
2645 break;
2646 }
2647
2648 } else if (streq(key, "mqueue")) {
2649 int fd, skip = 0;
2650 SocketPort *p;
2651
2652 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2653 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2654 else
2655 LIST_FOREACH(port, p, s->ports)
2656 if (p->type == SOCKET_MQUEUE &&
2657 streq(p->path, value+skip)) {
2658 socket_port_take_fd(p, fds, fd);
2659 break;
2660 }
2661
2662 } else if (streq(key, "socket")) {
2663 int fd, type, skip = 0;
2664 SocketPort *p;
2665
2666 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2667 log_unit_debug(u, "Failed to parse socket value: %s", value);
2668 else
2669 LIST_FOREACH(port, p, s->ports)
2670 if (socket_address_is(&p->address, value+skip, type)) {
2671 socket_port_take_fd(p, fds, fd);
2672 break;
2673 }
2674
2675 } else if (streq(key, "netlink")) {
2676 int fd, skip = 0;
2677 SocketPort *p;
2678
2679 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2680 log_unit_debug(u, "Failed to parse socket value: %s", value);
2681 else
2682 LIST_FOREACH(port, p, s->ports)
2683 if (socket_address_is_netlink(&p->address, value+skip)) {
2684 socket_port_take_fd(p, fds, fd);
2685 break;
2686 }
2687
2688 } else if (streq(key, "ffs")) {
2689 int fd, skip = 0;
2690 SocketPort *p;
2691
2692 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2693 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2694 else
2695 LIST_FOREACH(port, p, s->ports)
2696 if (p->type == SOCKET_USB_FUNCTION &&
2697 path_equal_or_files_same(p->path, value+skip, 0)) {
2698 socket_port_take_fd(p, fds, fd);
2699 break;
2700 }
2701
2702 } else
2703 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2704
2705 return 0;
2706 }
2707
2708 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2709 Socket *s = SOCKET(u);
2710 SocketPort *p;
2711
2712 assert(u);
2713
2714 LIST_FOREACH(port, p, s->ports) {
2715 Iterator i;
2716 int fd;
2717
2718 if (p->type != SOCKET_SOCKET)
2719 continue;
2720
2721 if (p->fd >= 0)
2722 continue;
2723
2724 FDSET_FOREACH(fd, fds, i) {
2725 if (socket_address_matches_fd(&p->address, fd)) {
2726 p->fd = fdset_remove(fds, fd);
2727 s->deserialized_state = SOCKET_LISTENING;
2728 break;
2729 }
2730 }
2731 }
2732 }
2733
2734 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2735 assert(u);
2736
2737 return state_translation_table[SOCKET(u)->state];
2738 }
2739
2740 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2741 assert(u);
2742
2743 return socket_state_to_string(SOCKET(u)->state);
2744 }
2745
2746 const char* socket_port_type_to_string(SocketPort *p) {
2747
2748 assert(p);
2749
2750 switch (p->type) {
2751
2752 case SOCKET_SOCKET:
2753
2754 switch (p->address.type) {
2755
2756 case SOCK_STREAM:
2757 return "Stream";
2758
2759 case SOCK_DGRAM:
2760 return "Datagram";
2761
2762 case SOCK_SEQPACKET:
2763 return "SequentialPacket";
2764
2765 case SOCK_RAW:
2766 if (socket_address_family(&p->address) == AF_NETLINK)
2767 return "Netlink";
2768
2769 _fallthrough_;
2770 default:
2771 return NULL;
2772 }
2773
2774 case SOCKET_SPECIAL:
2775 return "Special";
2776
2777 case SOCKET_MQUEUE:
2778 return "MessageQueue";
2779
2780 case SOCKET_FIFO:
2781 return "FIFO";
2782
2783 case SOCKET_USB_FUNCTION:
2784 return "USBFunction";
2785
2786 default:
2787 return NULL;
2788 }
2789 }
2790
2791 SocketType socket_port_type_from_string(const char *s) {
2792 assert(s);
2793
2794 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2795 return SOCKET_SOCKET;
2796 else if (streq(s, "Special"))
2797 return SOCKET_SPECIAL;
2798 else if (streq(s, "MessageQueue"))
2799 return SOCKET_MQUEUE;
2800 else if (streq(s, "FIFO"))
2801 return SOCKET_FIFO;
2802 else if (streq(s, "USBFunction"))
2803 return SOCKET_USB_FUNCTION;
2804 else
2805 return _SOCKET_TYPE_INVALID;
2806 }
2807
2808 _pure_ static bool socket_may_gc(Unit *u) {
2809 Socket *s = SOCKET(u);
2810
2811 assert(u);
2812
2813 return s->n_connections == 0;
2814 }
2815
2816 static int socket_accept_do(Socket *s, int fd) {
2817 int cfd;
2818
2819 assert(s);
2820 assert(fd >= 0);
2821
2822 for (;;) {
2823 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2824 if (cfd < 0) {
2825 if (errno == EINTR)
2826 continue;
2827
2828 return -errno;
2829 }
2830
2831 break;
2832 }
2833
2834 return cfd;
2835 }
2836
2837 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2838 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2839 int cfd, r;
2840 pid_t pid;
2841
2842 assert(s);
2843 assert(p);
2844 assert(fd >= 0);
2845
2846 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2847 * connection socket is also properly associated with the cgroup. */
2848
2849 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2850 goto shortcut;
2851
2852 r = bpf_firewall_supported();
2853 if (r < 0)
2854 return r;
2855 if (r == BPF_FIREWALL_UNSUPPORTED)
2856 goto shortcut;
2857
2858 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2859 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2860
2861 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2862 if (r < 0)
2863 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2864 if (r == 0) {
2865 /* Child */
2866
2867 pair[0] = safe_close(pair[0]);
2868
2869 cfd = socket_accept_do(s, fd);
2870 if (cfd < 0) {
2871 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2872 _exit(EXIT_FAILURE);
2873 }
2874
2875 r = send_one_fd(pair[1], cfd, 0);
2876 if (r < 0) {
2877 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2878 _exit(EXIT_FAILURE);
2879 }
2880
2881 _exit(EXIT_SUCCESS);
2882 }
2883
2884 pair[1] = safe_close(pair[1]);
2885 cfd = receive_one_fd(pair[0], 0);
2886
2887 /* We synchronously wait for the helper, as it shouldn't be slow */
2888 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2889 if (r < 0) {
2890 safe_close(cfd);
2891 return r;
2892 }
2893
2894 if (cfd < 0)
2895 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2896
2897 return cfd;
2898
2899 shortcut:
2900 cfd = socket_accept_do(s, fd);
2901 if (cfd < 0)
2902 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2903
2904 return cfd;
2905 }
2906
2907 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2908 SocketPort *p = userdata;
2909 int cfd = -1;
2910
2911 assert(p);
2912 assert(fd >= 0);
2913
2914 if (p->socket->state != SOCKET_LISTENING)
2915 return 0;
2916
2917 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2918
2919 if (revents != EPOLLIN) {
2920
2921 if (revents & EPOLLHUP)
2922 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.");
2923 else
2924 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2925 goto fail;
2926 }
2927
2928 if (p->socket->accept &&
2929 p->type == SOCKET_SOCKET &&
2930 socket_address_can_accept(&p->address)) {
2931
2932 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2933 if (cfd < 0)
2934 goto fail;
2935
2936 socket_apply_socket_options(p->socket, cfd);
2937 }
2938
2939 socket_enter_running(p->socket, cfd);
2940 return 0;
2941
2942 fail:
2943 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2944 return 0;
2945 }
2946
2947 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2948 Socket *s = SOCKET(u);
2949 SocketResult f;
2950
2951 assert(s);
2952 assert(pid >= 0);
2953
2954 if (pid != s->control_pid)
2955 return;
2956
2957 s->control_pid = 0;
2958
2959 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2960 f = SOCKET_SUCCESS;
2961 else if (code == CLD_EXITED)
2962 f = SOCKET_FAILURE_EXIT_CODE;
2963 else if (code == CLD_KILLED)
2964 f = SOCKET_FAILURE_SIGNAL;
2965 else if (code == CLD_DUMPED)
2966 f = SOCKET_FAILURE_CORE_DUMP;
2967 else
2968 assert_not_reached("Unknown sigchld code");
2969
2970 if (s->control_command) {
2971 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2972
2973 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2974 f = SOCKET_SUCCESS;
2975 }
2976
2977 unit_log_process_exit(
2978 u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
2979 "Control process",
2980 socket_exec_command_to_string(s->control_command_id),
2981 code, status);
2982
2983 if (s->result == SOCKET_SUCCESS)
2984 s->result = f;
2985
2986 if (s->control_command &&
2987 s->control_command->command_next &&
2988 f == SOCKET_SUCCESS) {
2989
2990 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2991 socket_run_next(s);
2992 } else {
2993 s->control_command = NULL;
2994 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2995
2996 /* No further commands for this step, so let's figure
2997 * out what to do next */
2998
2999 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3000
3001 switch (s->state) {
3002
3003 case SOCKET_START_PRE:
3004 if (f == SOCKET_SUCCESS)
3005 socket_enter_start_chown(s);
3006 else
3007 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3008 break;
3009
3010 case SOCKET_START_CHOWN:
3011 if (f == SOCKET_SUCCESS)
3012 socket_enter_start_post(s);
3013 else
3014 socket_enter_stop_pre(s, f);
3015 break;
3016
3017 case SOCKET_START_POST:
3018 if (f == SOCKET_SUCCESS)
3019 socket_enter_listening(s);
3020 else
3021 socket_enter_stop_pre(s, f);
3022 break;
3023
3024 case SOCKET_STOP_PRE:
3025 case SOCKET_STOP_PRE_SIGTERM:
3026 case SOCKET_STOP_PRE_SIGKILL:
3027 socket_enter_stop_post(s, f);
3028 break;
3029
3030 case SOCKET_STOP_POST:
3031 case SOCKET_FINAL_SIGTERM:
3032 case SOCKET_FINAL_SIGKILL:
3033 socket_enter_dead(s, f);
3034 break;
3035
3036 default:
3037 assert_not_reached("Uh, control process died at wrong time.");
3038 }
3039 }
3040
3041 /* Notify clients about changed exit status */
3042 unit_add_to_dbus_queue(u);
3043 }
3044
3045 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3046 Socket *s = SOCKET(userdata);
3047
3048 assert(s);
3049 assert(s->timer_event_source == source);
3050
3051 switch (s->state) {
3052
3053 case SOCKET_START_PRE:
3054 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3055 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3056 break;
3057
3058 case SOCKET_START_CHOWN:
3059 case SOCKET_START_POST:
3060 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3061 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3062 break;
3063
3064 case SOCKET_STOP_PRE:
3065 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3066 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3067 break;
3068
3069 case SOCKET_STOP_PRE_SIGTERM:
3070 if (s->kill_context.send_sigkill) {
3071 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3072 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3073 } else {
3074 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3075 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3076 }
3077 break;
3078
3079 case SOCKET_STOP_PRE_SIGKILL:
3080 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3081 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3082 break;
3083
3084 case SOCKET_STOP_POST:
3085 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3086 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3087 break;
3088
3089 case SOCKET_FINAL_SIGTERM:
3090 if (s->kill_context.send_sigkill) {
3091 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3092 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3093 } else {
3094 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3095 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3096 }
3097 break;
3098
3099 case SOCKET_FINAL_SIGKILL:
3100 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3101 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3102 break;
3103
3104 default:
3105 assert_not_reached("Timeout at wrong time.");
3106 }
3107
3108 return 0;
3109 }
3110
3111 int socket_collect_fds(Socket *s, int **fds) {
3112 size_t k = 0, n = 0;
3113 SocketPort *p;
3114 int *rfds;
3115
3116 assert(s);
3117 assert(fds);
3118
3119 /* Called from the service code for requesting our fds */
3120
3121 LIST_FOREACH(port, p, s->ports) {
3122 if (p->fd >= 0)
3123 n++;
3124 n += p->n_auxiliary_fds;
3125 }
3126
3127 if (n <= 0) {
3128 *fds = NULL;
3129 return 0;
3130 }
3131
3132 rfds = new(int, n);
3133 if (!rfds)
3134 return -ENOMEM;
3135
3136 LIST_FOREACH(port, p, s->ports) {
3137 size_t i;
3138
3139 if (p->fd >= 0)
3140 rfds[k++] = p->fd;
3141 for (i = 0; i < p->n_auxiliary_fds; ++i)
3142 rfds[k++] = p->auxiliary_fds[i];
3143 }
3144
3145 assert(k == n);
3146
3147 *fds = rfds;
3148 return (int) n;
3149 }
3150
3151 static void socket_reset_failed(Unit *u) {
3152 Socket *s = SOCKET(u);
3153
3154 assert(s);
3155
3156 if (s->state == SOCKET_FAILED)
3157 socket_set_state(s, SOCKET_DEAD);
3158
3159 s->result = SOCKET_SUCCESS;
3160 }
3161
3162 void socket_connection_unref(Socket *s) {
3163 assert(s);
3164
3165 /* The service is dead. Yay!
3166 *
3167 * This is strictly for one-instance-per-connection
3168 * services. */
3169
3170 assert(s->n_connections > 0);
3171 s->n_connections--;
3172
3173 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3174 }
3175
3176 static void socket_trigger_notify(Unit *u, Unit *other) {
3177 Socket *s = SOCKET(u);
3178
3179 assert(u);
3180 assert(other);
3181
3182 /* Filter out invocations with bogus state */
3183 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3184 return;
3185
3186 /* Don't propagate state changes from the service if we are already down */
3187 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3188 return;
3189
3190 /* We don't care for the service state if we are in Accept=yes mode */
3191 if (s->accept)
3192 return;
3193
3194 /* Propagate start limit hit state */
3195 if (other->start_limit_hit) {
3196 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3197 return;
3198 }
3199
3200 /* Don't propagate anything if there's still a job queued */
3201 if (other->job)
3202 return;
3203
3204 if (IN_SET(SERVICE(other)->state,
3205 SERVICE_DEAD, SERVICE_FAILED,
3206 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3207 SERVICE_AUTO_RESTART))
3208 socket_enter_listening(s);
3209
3210 if (SERVICE(other)->state == SERVICE_RUNNING)
3211 socket_set_state(s, SOCKET_RUNNING);
3212 }
3213
3214 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3215 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3216 }
3217
3218 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3219 Socket *s = SOCKET(u);
3220 usec_t t;
3221 int r;
3222
3223 if (!s->timer_event_source)
3224 return 0;
3225
3226 r = sd_event_source_get_time(s->timer_event_source, &t);
3227 if (r < 0)
3228 return r;
3229 if (t == USEC_INFINITY)
3230 return 0;
3231
3232 *timeout = t;
3233 return 1;
3234 }
3235
3236 char *socket_fdname(Socket *s) {
3237 assert(s);
3238
3239 /* Returns the name to use for $LISTEN_NAMES. If the user
3240 * didn't specify anything specifically, use the socket unit's
3241 * name as fallback. */
3242
3243 return s->fdname ?: UNIT(s)->id;
3244 }
3245
3246 static int socket_control_pid(Unit *u) {
3247 Socket *s = SOCKET(u);
3248
3249 assert(s);
3250
3251 return s->control_pid;
3252 }
3253
3254 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3255 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3256 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3257 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3258 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3259 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3260 };
3261
3262 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3263
3264 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3265 [SOCKET_SUCCESS] = "success",
3266 [SOCKET_FAILURE_RESOURCES] = "resources",
3267 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3268 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3269 [SOCKET_FAILURE_SIGNAL] = "signal",
3270 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3271 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3272 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3273 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3274 };
3275
3276 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3277
3278 const UnitVTable socket_vtable = {
3279 .object_size = sizeof(Socket),
3280 .exec_context_offset = offsetof(Socket, exec_context),
3281 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3282 .kill_context_offset = offsetof(Socket, kill_context),
3283 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3284 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3285
3286 .sections =
3287 "Unit\0"
3288 "Socket\0"
3289 "Install\0",
3290 .private_section = "Socket",
3291
3292 .can_transient = true,
3293
3294 .init = socket_init,
3295 .done = socket_done,
3296 .load = socket_load,
3297
3298 .coldplug = socket_coldplug,
3299
3300 .dump = socket_dump,
3301
3302 .start = socket_start,
3303 .stop = socket_stop,
3304
3305 .kill = socket_kill,
3306
3307 .get_timeout = socket_get_timeout,
3308
3309 .serialize = socket_serialize,
3310 .deserialize_item = socket_deserialize_item,
3311 .distribute_fds = socket_distribute_fds,
3312
3313 .active_state = socket_active_state,
3314 .sub_state_to_string = socket_sub_state_to_string,
3315
3316 .may_gc = socket_may_gc,
3317
3318 .sigchld_event = socket_sigchld_event,
3319
3320 .trigger_notify = socket_trigger_notify,
3321
3322 .reset_failed = socket_reset_failed,
3323
3324 .control_pid = socket_control_pid,
3325
3326 .bus_vtable = bus_socket_vtable,
3327 .bus_set_property = bus_socket_set_property,
3328 .bus_commit_properties = bus_socket_commit_properties,
3329
3330 .status_message_formats = {
3331 /*.starting_stopping = {
3332 [0] = "Starting socket %s...",
3333 [1] = "Stopping socket %s...",
3334 },*/
3335 .finished_start_job = {
3336 [JOB_DONE] = "Listening on %s.",
3337 [JOB_FAILED] = "Failed to listen on %s.",
3338 [JOB_TIMEOUT] = "Timed out starting %s.",
3339 },
3340 .finished_stop_job = {
3341 [JOB_DONE] = "Closed %s.",
3342 [JOB_FAILED] = "Failed stopping %s.",
3343 [JOB_TIMEOUT] = "Timed out stopping %s.",
3344 },
3345 },
3346 };
Unnamed repository; edit this file 'description' to name the repository.