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[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
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 <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "copy.h"
18 #include "dbus-socket.h"
19 #include "dbus-unit.h"
20 #include "def.h"
21 #include "errno-list.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 "ip-protocol-list.h"
29 #include "label.h"
30 #include "log.h"
31 #include "mkdir.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "signal-util.h"
38 #include "smack-util.h"
39 #include "socket.h"
40 #include "socket-netlink.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 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
72 };
73
74 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
75 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
76 static void flush_ports(Socket *s);
77
78 static void socket_init(Unit *u) {
79 Socket *s = SOCKET(u);
80
81 assert(u);
82 assert(u->load_state == UNIT_STUB);
83
84 s->backlog = SOMAXCONN;
85 s->timeout_usec = u->manager->default_timeout_start_usec;
86 s->directory_mode = 0755;
87 s->socket_mode = 0666;
88
89 s->max_connections = 64;
90
91 s->priority = -1;
92 s->ip_tos = -1;
93 s->ip_ttl = -1;
94 s->mark = -1;
95
96 s->exec_context.std_output = u->manager->default_std_output;
97 s->exec_context.std_error = u->manager->default_std_error;
98
99 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
100
101 s->trigger_limit.interval = USEC_INFINITY;
102 s->trigger_limit.burst = (unsigned) -1;
103 }
104
105 static void socket_unwatch_control_pid(Socket *s) {
106 assert(s);
107
108 if (s->control_pid <= 0)
109 return;
110
111 unit_unwatch_pid(UNIT(s), s->control_pid);
112 s->control_pid = 0;
113 }
114
115 static void socket_cleanup_fd_list(SocketPort *p) {
116 assert(p);
117
118 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
119 p->auxiliary_fds = mfree(p->auxiliary_fds);
120 p->n_auxiliary_fds = 0;
121 }
122
123 void socket_free_ports(Socket *s) {
124 SocketPort *p;
125
126 assert(s);
127
128 while ((p = s->ports)) {
129 LIST_REMOVE(port, s->ports, p);
130
131 sd_event_source_unref(p->event_source);
132
133 socket_cleanup_fd_list(p);
134 safe_close(p->fd);
135 free(p->path);
136 free(p);
137 }
138 }
139
140 static void socket_done(Unit *u) {
141 Socket *s = SOCKET(u);
142 SocketPeer *p;
143
144 assert(s);
145
146 socket_free_ports(s);
147
148 while ((p = set_steal_first(s->peers_by_address)))
149 p->socket = NULL;
150
151 s->peers_by_address = set_free(s->peers_by_address);
152
153 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
154 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
155 s->control_command = NULL;
156
157 dynamic_creds_unref(&s->dynamic_creds);
158
159 socket_unwatch_control_pid(s);
160
161 unit_ref_unset(&s->service);
162
163 s->tcp_congestion = mfree(s->tcp_congestion);
164 s->bind_to_device = mfree(s->bind_to_device);
165
166 s->smack = mfree(s->smack);
167 s->smack_ip_in = mfree(s->smack_ip_in);
168 s->smack_ip_out = mfree(s->smack_ip_out);
169
170 strv_free(s->symlinks);
171
172 s->user = mfree(s->user);
173 s->group = mfree(s->group);
174
175 s->fdname = mfree(s->fdname);
176
177 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
178 }
179
180 static int socket_arm_timer(Socket *s, usec_t usec) {
181 int r;
182
183 assert(s);
184
185 if (s->timer_event_source) {
186 r = sd_event_source_set_time(s->timer_event_source, usec);
187 if (r < 0)
188 return r;
189
190 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
191 }
192
193 if (usec == USEC_INFINITY)
194 return 0;
195
196 r = sd_event_add_time(
197 UNIT(s)->manager->event,
198 &s->timer_event_source,
199 CLOCK_MONOTONIC,
200 usec, 0,
201 socket_dispatch_timer, s);
202 if (r < 0)
203 return r;
204
205 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
206
207 return 0;
208 }
209
210 static bool have_non_accept_socket(Socket *s) {
211 SocketPort *p;
212
213 assert(s);
214
215 if (!s->accept)
216 return true;
217
218 LIST_FOREACH(port, p, s->ports) {
219
220 if (p->type != SOCKET_SOCKET)
221 return true;
222
223 if (!socket_address_can_accept(&p->address))
224 return true;
225 }
226
227 return false;
228 }
229
230 static int socket_add_mount_dependencies(Socket *s) {
231 SocketPort *p;
232 int r;
233
234 assert(s);
235
236 LIST_FOREACH(port, p, s->ports) {
237 const char *path = NULL;
238
239 if (p->type == SOCKET_SOCKET)
240 path = socket_address_get_path(&p->address);
241 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
242 path = p->path;
243
244 if (!path)
245 continue;
246
247 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
248 if (r < 0)
249 return r;
250 }
251
252 return 0;
253 }
254
255 static int socket_add_device_dependencies(Socket *s) {
256 char *t;
257
258 assert(s);
259
260 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
261 return 0;
262
263 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
264 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
265 }
266
267 static int socket_add_default_dependencies(Socket *s) {
268 int r;
269 assert(s);
270
271 if (!UNIT(s)->default_dependencies)
272 return 0;
273
274 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
275 if (r < 0)
276 return r;
277
278 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
279 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
280 if (r < 0)
281 return r;
282 }
283
284 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
285 }
286
287 _pure_ static bool socket_has_exec(Socket *s) {
288 unsigned i;
289 assert(s);
290
291 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
292 if (s->exec_command[i])
293 return true;
294
295 return false;
296 }
297
298 static int socket_add_extras(Socket *s) {
299 Unit *u = UNIT(s);
300 int r;
301
302 assert(s);
303
304 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
305 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
306 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
307 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
308 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
309 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
310 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
311 * service starts are typical. */
312
313 if (s->trigger_limit.interval == USEC_INFINITY)
314 s->trigger_limit.interval = 2 * USEC_PER_SEC;
315
316 if (s->trigger_limit.burst == (unsigned) -1) {
317 if (s->accept)
318 s->trigger_limit.burst = 200;
319 else
320 s->trigger_limit.burst = 20;
321 }
322
323 if (have_non_accept_socket(s)) {
324
325 if (!UNIT_DEREF(s->service)) {
326 Unit *x;
327
328 r = unit_load_related_unit(u, ".service", &x);
329 if (r < 0)
330 return r;
331
332 unit_ref_set(&s->service, u, x);
333 }
334
335 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
336 if (r < 0)
337 return r;
338 }
339
340 r = socket_add_mount_dependencies(s);
341 if (r < 0)
342 return r;
343
344 r = socket_add_device_dependencies(s);
345 if (r < 0)
346 return r;
347
348 r = unit_patch_contexts(u);
349 if (r < 0)
350 return r;
351
352 if (socket_has_exec(s)) {
353 r = unit_add_exec_dependencies(u, &s->exec_context);
354 if (r < 0)
355 return r;
356 }
357
358 r = unit_set_default_slice(u);
359 if (r < 0)
360 return r;
361
362 r = socket_add_default_dependencies(s);
363 if (r < 0)
364 return r;
365
366 return 0;
367 }
368
369 static const char *socket_find_symlink_target(Socket *s) {
370 const char *found = NULL;
371 SocketPort *p;
372
373 LIST_FOREACH(port, p, s->ports) {
374 const char *f = NULL;
375
376 switch (p->type) {
377
378 case SOCKET_FIFO:
379 f = p->path;
380 break;
381
382 case SOCKET_SOCKET:
383 f = socket_address_get_path(&p->address);
384 break;
385
386 default:
387 break;
388 }
389
390 if (f) {
391 if (found)
392 return NULL;
393
394 found = f;
395 }
396 }
397
398 return found;
399 }
400
401 static int socket_verify(Socket *s) {
402 assert(s);
403 assert(UNIT(s)->load_state == UNIT_LOADED);
404
405 if (!s->ports)
406 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
407
408 if (s->accept && have_non_accept_socket(s))
409 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
410
411 if (s->accept && s->max_connections <= 0)
412 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
413
414 if (s->accept && UNIT_DEREF(s->service))
415 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
416
417 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
418 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
419
420 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
421 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
422
423 return 0;
424 }
425
426 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
427 assert(s);
428
429 if (s->peer.sa.sa_family == AF_INET)
430 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
431 else if (s->peer.sa.sa_family == AF_INET6)
432 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
433 else if (s->peer.sa.sa_family == AF_VSOCK)
434 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
435 else
436 assert_not_reached("Unknown address family.");
437 }
438
439 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
440 int r;
441
442 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
443 if (r != 0)
444 return r;
445
446 switch(x->peer.sa.sa_family) {
447 case AF_INET:
448 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
449 case AF_INET6:
450 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
451 case AF_VSOCK:
452 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
453 }
454 assert_not_reached("Black sheep in the family!");
455 }
456
457 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
458
459 static int socket_load(Unit *u) {
460 Socket *s = SOCKET(u);
461 int r;
462
463 assert(u);
464 assert(u->load_state == UNIT_STUB);
465
466 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
467 if (r < 0)
468 return r;
469
470 r = unit_load_fragment_and_dropin(u, true);
471 if (r < 0)
472 return r;
473
474 if (u->load_state != UNIT_LOADED)
475 return 0;
476
477 /* This is a new unit? Then let's add in some extras */
478 r = socket_add_extras(s);
479 if (r < 0)
480 return r;
481
482 return socket_verify(s);
483 }
484
485 static SocketPeer *socket_peer_new(void) {
486 SocketPeer *p;
487
488 p = new0(SocketPeer, 1);
489 if (!p)
490 return NULL;
491
492 p->n_ref = 1;
493
494 return p;
495 }
496
497 static SocketPeer *socket_peer_free(SocketPeer *p) {
498 assert(p);
499
500 if (p->socket)
501 set_remove(p->socket->peers_by_address, p);
502
503 return mfree(p);
504 }
505
506 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
507
508 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
509 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
510 SocketPeer sa = {}, *i;
511 socklen_t salen = sizeof(sa.peer);
512 int r;
513
514 assert(fd >= 0);
515 assert(s);
516
517 if (getpeername(fd, &sa.peer.sa, &salen) < 0)
518 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
519
520 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
521 *p = NULL;
522 return 0;
523 }
524
525 i = set_get(s->peers_by_address, &sa);
526 if (i) {
527 *p = socket_peer_ref(i);
528 return 1;
529 }
530
531 remote = socket_peer_new();
532 if (!remote)
533 return log_oom();
534
535 remote->peer = sa.peer;
536 remote->peer_salen = salen;
537
538 r = set_put(s->peers_by_address, remote);
539 if (r < 0)
540 return r;
541
542 remote->socket = s;
543
544 *p = TAKE_PTR(remote);
545
546 return 1;
547 }
548
549 _const_ static const char* listen_lookup(int family, int type) {
550
551 if (family == AF_NETLINK)
552 return "ListenNetlink";
553
554 if (type == SOCK_STREAM)
555 return "ListenStream";
556 else if (type == SOCK_DGRAM)
557 return "ListenDatagram";
558 else if (type == SOCK_SEQPACKET)
559 return "ListenSequentialPacket";
560
561 assert_not_reached("Unknown socket type");
562 return NULL;
563 }
564
565 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
566 char time_string[FORMAT_TIMESPAN_MAX];
567 SocketExecCommand c;
568 Socket *s = SOCKET(u);
569 SocketPort *p;
570 const char *prefix2, *str;
571
572 assert(s);
573 assert(f);
574
575 prefix = strempty(prefix);
576 prefix2 = strjoina(prefix, "\t");
577
578 fprintf(f,
579 "%sSocket State: %s\n"
580 "%sResult: %s\n"
581 "%sClean Result: %s\n"
582 "%sBindIPv6Only: %s\n"
583 "%sBacklog: %u\n"
584 "%sSocketMode: %04o\n"
585 "%sDirectoryMode: %04o\n"
586 "%sKeepAlive: %s\n"
587 "%sNoDelay: %s\n"
588 "%sFreeBind: %s\n"
589 "%sTransparent: %s\n"
590 "%sBroadcast: %s\n"
591 "%sPassCredentials: %s\n"
592 "%sPassSecurity: %s\n"
593 "%sPassPacketInfo: %s\n"
594 "%sTCPCongestion: %s\n"
595 "%sRemoveOnStop: %s\n"
596 "%sWritable: %s\n"
597 "%sFileDescriptorName: %s\n"
598 "%sSELinuxContextFromNet: %s\n",
599 prefix, socket_state_to_string(s->state),
600 prefix, socket_result_to_string(s->result),
601 prefix, socket_result_to_string(s->clean_result),
602 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
603 prefix, s->backlog,
604 prefix, s->socket_mode,
605 prefix, s->directory_mode,
606 prefix, yes_no(s->keep_alive),
607 prefix, yes_no(s->no_delay),
608 prefix, yes_no(s->free_bind),
609 prefix, yes_no(s->transparent),
610 prefix, yes_no(s->broadcast),
611 prefix, yes_no(s->pass_cred),
612 prefix, yes_no(s->pass_sec),
613 prefix, yes_no(s->pass_pktinfo),
614 prefix, strna(s->tcp_congestion),
615 prefix, yes_no(s->remove_on_stop),
616 prefix, yes_no(s->writable),
617 prefix, socket_fdname(s),
618 prefix, yes_no(s->selinux_context_from_net));
619
620 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
621 fprintf(f,
622 "%sTimestamping: %s\n",
623 prefix, socket_timestamping_to_string(s->timestamping));
624
625 if (s->control_pid > 0)
626 fprintf(f,
627 "%sControl PID: "PID_FMT"\n",
628 prefix, s->control_pid);
629
630 if (s->bind_to_device)
631 fprintf(f,
632 "%sBindToDevice: %s\n",
633 prefix, s->bind_to_device);
634
635 if (s->accept)
636 fprintf(f,
637 "%sAccepted: %u\n"
638 "%sNConnections: %u\n"
639 "%sMaxConnections: %u\n"
640 "%sMaxConnectionsPerSource: %u\n",
641 prefix, s->n_accepted,
642 prefix, s->n_connections,
643 prefix, s->max_connections,
644 prefix, s->max_connections_per_source);
645 else
646 fprintf(f,
647 "%sFlushPending: %s\n",
648 prefix, yes_no(s->flush_pending));
649
650
651 if (s->priority >= 0)
652 fprintf(f,
653 "%sPriority: %i\n",
654 prefix, s->priority);
655
656 if (s->receive_buffer > 0)
657 fprintf(f,
658 "%sReceiveBuffer: %zu\n",
659 prefix, s->receive_buffer);
660
661 if (s->send_buffer > 0)
662 fprintf(f,
663 "%sSendBuffer: %zu\n",
664 prefix, s->send_buffer);
665
666 if (s->ip_tos >= 0)
667 fprintf(f,
668 "%sIPTOS: %i\n",
669 prefix, s->ip_tos);
670
671 if (s->ip_ttl >= 0)
672 fprintf(f,
673 "%sIPTTL: %i\n",
674 prefix, s->ip_ttl);
675
676 if (s->pipe_size > 0)
677 fprintf(f,
678 "%sPipeSize: %zu\n",
679 prefix, s->pipe_size);
680
681 if (s->mark >= 0)
682 fprintf(f,
683 "%sMark: %i\n",
684 prefix, s->mark);
685
686 if (s->mq_maxmsg > 0)
687 fprintf(f,
688 "%sMessageQueueMaxMessages: %li\n",
689 prefix, s->mq_maxmsg);
690
691 if (s->mq_msgsize > 0)
692 fprintf(f,
693 "%sMessageQueueMessageSize: %li\n",
694 prefix, s->mq_msgsize);
695
696 if (s->reuse_port)
697 fprintf(f,
698 "%sReusePort: %s\n",
699 prefix, yes_no(s->reuse_port));
700
701 if (s->smack)
702 fprintf(f,
703 "%sSmackLabel: %s\n",
704 prefix, s->smack);
705
706 if (s->smack_ip_in)
707 fprintf(f,
708 "%sSmackLabelIPIn: %s\n",
709 prefix, s->smack_ip_in);
710
711 if (s->smack_ip_out)
712 fprintf(f,
713 "%sSmackLabelIPOut: %s\n",
714 prefix, s->smack_ip_out);
715
716 if (!isempty(s->user) || !isempty(s->group))
717 fprintf(f,
718 "%sSocketUser: %s\n"
719 "%sSocketGroup: %s\n",
720 prefix, strna(s->user),
721 prefix, strna(s->group));
722
723 if (s->keep_alive_time > 0)
724 fprintf(f,
725 "%sKeepAliveTimeSec: %s\n",
726 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
727
728 if (s->keep_alive_interval > 0)
729 fprintf(f,
730 "%sKeepAliveIntervalSec: %s\n",
731 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
732
733 if (s->keep_alive_cnt > 0)
734 fprintf(f,
735 "%sKeepAliveProbes: %u\n",
736 prefix, s->keep_alive_cnt);
737
738 if (s->defer_accept > 0)
739 fprintf(f,
740 "%sDeferAcceptSec: %s\n",
741 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
742
743 LIST_FOREACH(port, p, s->ports) {
744
745 switch (p->type) {
746 case SOCKET_SOCKET: {
747 _cleanup_free_ char *k = NULL;
748 const char *t;
749 int r;
750
751 r = socket_address_print(&p->address, &k);
752 if (r < 0)
753 t = strerror_safe(r);
754 else
755 t = k;
756
757 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
758 break;
759 }
760 case SOCKET_SPECIAL:
761 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
762 break;
763 case SOCKET_USB_FUNCTION:
764 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
765 break;
766 case SOCKET_MQUEUE:
767 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
768 break;
769 default:
770 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
771 }
772 }
773
774 fprintf(f,
775 "%sTriggerLimitIntervalSec: %s\n"
776 "%sTriggerLimitBurst: %u\n",
777 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
778 prefix, s->trigger_limit.burst);
779
780 str = ip_protocol_to_name(s->socket_protocol);
781 if (str)
782 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
783
784 if (!strv_isempty(s->symlinks)) {
785 char **q;
786
787 fprintf(f, "%sSymlinks:", prefix);
788 STRV_FOREACH(q, s->symlinks)
789 fprintf(f, " %s", *q);
790
791 fprintf(f, "\n");
792 }
793
794 fprintf(f,
795 "%sTimeoutSec: %s\n",
796 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
797
798 exec_context_dump(&s->exec_context, f, prefix);
799 kill_context_dump(&s->kill_context, f, prefix);
800
801 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
802 if (!s->exec_command[c])
803 continue;
804
805 fprintf(f, "%s-> %s:\n",
806 prefix, socket_exec_command_to_string(c));
807
808 exec_command_dump_list(s->exec_command[c], f, prefix2);
809 }
810
811 cgroup_context_dump(UNIT(s), f, prefix);
812 }
813
814 static int instance_from_socket(int fd, unsigned nr, char **instance) {
815 socklen_t l;
816 char *r;
817 union sockaddr_union local, remote;
818
819 assert(fd >= 0);
820 assert(instance);
821
822 l = sizeof(local);
823 if (getsockname(fd, &local.sa, &l) < 0)
824 return -errno;
825
826 l = sizeof(remote);
827 if (getpeername(fd, &remote.sa, &l) < 0)
828 return -errno;
829
830 switch (local.sa.sa_family) {
831
832 case AF_INET: {
833 uint32_t
834 a = be32toh(local.in.sin_addr.s_addr),
835 b = be32toh(remote.in.sin_addr.s_addr);
836
837 if (asprintf(&r,
838 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
839 nr,
840 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
841 be16toh(local.in.sin_port),
842 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
843 be16toh(remote.in.sin_port)) < 0)
844 return -ENOMEM;
845
846 break;
847 }
848
849 case AF_INET6: {
850 static const unsigned char ipv4_prefix[] = {
851 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
852 };
853
854 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
855 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
856 const uint8_t
857 *a = local.in6.sin6_addr.s6_addr+12,
858 *b = remote.in6.sin6_addr.s6_addr+12;
859
860 if (asprintf(&r,
861 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
862 nr,
863 a[0], a[1], a[2], a[3],
864 be16toh(local.in6.sin6_port),
865 b[0], b[1], b[2], b[3],
866 be16toh(remote.in6.sin6_port)) < 0)
867 return -ENOMEM;
868 } else {
869 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
870
871 if (asprintf(&r,
872 "%u-%s:%u-%s:%u",
873 nr,
874 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
875 be16toh(local.in6.sin6_port),
876 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
877 be16toh(remote.in6.sin6_port)) < 0)
878 return -ENOMEM;
879 }
880
881 break;
882 }
883
884 case AF_UNIX: {
885 struct ucred ucred;
886 int k;
887
888 k = getpeercred(fd, &ucred);
889 if (k >= 0) {
890 if (asprintf(&r,
891 "%u-"PID_FMT"-"UID_FMT,
892 nr, ucred.pid, ucred.uid) < 0)
893 return -ENOMEM;
894 } else if (k == -ENODATA) {
895 /* This handles the case where somebody is
896 * connecting from another pid/uid namespace
897 * (e.g. from outside of our container). */
898 if (asprintf(&r,
899 "%u-unknown",
900 nr) < 0)
901 return -ENOMEM;
902 } else
903 return k;
904
905 break;
906 }
907
908 case AF_VSOCK:
909 if (asprintf(&r,
910 "%u-%u:%u-%u:%u",
911 nr,
912 local.vm.svm_cid, local.vm.svm_port,
913 remote.vm.svm_cid, remote.vm.svm_port) < 0)
914 return -ENOMEM;
915
916 break;
917
918 default:
919 assert_not_reached("Unhandled socket type.");
920 }
921
922 *instance = r;
923 return 0;
924 }
925
926 static void socket_close_fds(Socket *s) {
927 SocketPort *p;
928 char **i;
929
930 assert(s);
931
932 LIST_FOREACH(port, p, s->ports) {
933 bool was_open;
934
935 was_open = p->fd >= 0;
936
937 p->event_source = sd_event_source_unref(p->event_source);
938 p->fd = safe_close(p->fd);
939 socket_cleanup_fd_list(p);
940
941 /* One little note: we should normally not delete any sockets in the file system here! After all some
942 * other process we spawned might still have a reference of this fd and wants to continue to use
943 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
944 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
945 * anyway, but only then. */
946
947 if (!was_open || !s->remove_on_stop)
948 continue;
949
950 switch (p->type) {
951
952 case SOCKET_FIFO:
953 (void) unlink(p->path);
954 break;
955
956 case SOCKET_MQUEUE:
957 (void) mq_unlink(p->path);
958 break;
959
960 case SOCKET_SOCKET:
961 (void) socket_address_unlink(&p->address);
962 break;
963
964 default:
965 break;
966 }
967 }
968
969 if (s->remove_on_stop)
970 STRV_FOREACH(i, s->symlinks)
971 (void) unlink(*i);
972
973 /* Note that we don't return NULL here, since s has not been freed. */
974 }
975
976 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
977 int r;
978
979 assert(s);
980 assert(p);
981 assert(fd >= 0);
982
983 if (s->keep_alive) {
984 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
985 if (r < 0)
986 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
987 }
988
989 if (s->keep_alive_time > 0) {
990 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
991 if (r < 0)
992 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
993 }
994
995 if (s->keep_alive_interval > 0) {
996 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
997 if (r < 0)
998 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
999 }
1000
1001 if (s->keep_alive_cnt > 0) {
1002 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1003 if (r < 0)
1004 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1005 }
1006
1007 if (s->defer_accept > 0) {
1008 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1009 if (r < 0)
1010 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1011 }
1012
1013 if (s->no_delay) {
1014 if (s->socket_protocol == IPPROTO_SCTP) {
1015 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1016 if (r < 0)
1017 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1018 } else {
1019 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1020 if (r < 0)
1021 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1022 }
1023 }
1024
1025 if (s->broadcast) {
1026 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1027 if (r < 0)
1028 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1029 }
1030
1031 if (s->pass_cred) {
1032 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1033 if (r < 0)
1034 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1035 }
1036
1037 if (s->pass_sec) {
1038 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1039 if (r < 0)
1040 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1041 }
1042
1043 if (s->pass_pktinfo) {
1044 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1045 if (r < 0)
1046 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1047 }
1048
1049 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1050 r = setsockopt_int(fd, SOL_SOCKET,
1051 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1052 true);
1053 if (r < 0)
1054 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1055 }
1056
1057 if (s->priority >= 0) {
1058 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1059 if (r < 0)
1060 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1061 }
1062
1063 if (s->receive_buffer > 0) {
1064 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1065 if (r < 0)
1066 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1067 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1068 }
1069
1070 if (s->send_buffer > 0) {
1071 r = fd_set_sndbuf(fd, s->send_buffer, false);
1072 if (r < 0)
1073 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1074 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1075 }
1076
1077 if (s->mark >= 0) {
1078 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1079 if (r < 0)
1080 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1081 }
1082
1083 if (s->ip_tos >= 0) {
1084 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1085 if (r < 0)
1086 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1087 }
1088
1089 if (s->ip_ttl >= 0) {
1090 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1091 if (r < 0)
1092 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1093 }
1094
1095 if (s->tcp_congestion)
1096 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1097 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1098
1099 if (s->smack_ip_in) {
1100 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1101 if (r < 0)
1102 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1103 }
1104
1105 if (s->smack_ip_out) {
1106 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1107 if (r < 0)
1108 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1109 }
1110 }
1111
1112 static void socket_apply_fifo_options(Socket *s, int fd) {
1113 int r;
1114
1115 assert(s);
1116 assert(fd >= 0);
1117
1118 if (s->pipe_size > 0)
1119 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1120 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1121
1122 if (s->smack) {
1123 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1124 if (r < 0)
1125 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1126 }
1127 }
1128
1129 static int fifo_address_create(
1130 const char *path,
1131 mode_t directory_mode,
1132 mode_t socket_mode) {
1133
1134 _cleanup_close_ int fd = -1;
1135 mode_t old_mask;
1136 struct stat st;
1137 int r;
1138
1139 assert(path);
1140
1141 (void) mkdir_parents_label(path, directory_mode);
1142
1143 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1144 if (r < 0)
1145 return r;
1146
1147 /* Enforce the right access mode for the fifo */
1148 old_mask = umask(~socket_mode);
1149
1150 /* Include the original umask in our mask */
1151 (void) umask(~socket_mode | old_mask);
1152
1153 r = mkfifo(path, socket_mode);
1154 (void) umask(old_mask);
1155
1156 if (r < 0 && errno != EEXIST) {
1157 r = -errno;
1158 goto fail;
1159 }
1160
1161 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1162 if (fd < 0) {
1163 r = -errno;
1164 goto fail;
1165 }
1166
1167 mac_selinux_create_file_clear();
1168
1169 if (fstat(fd, &st) < 0) {
1170 r = -errno;
1171 goto fail;
1172 }
1173
1174 if (!S_ISFIFO(st.st_mode) ||
1175 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1176 st.st_uid != getuid() ||
1177 st.st_gid != getgid()) {
1178 r = -EEXIST;
1179 goto fail;
1180 }
1181
1182 return TAKE_FD(fd);
1183
1184 fail:
1185 mac_selinux_create_file_clear();
1186 return r;
1187 }
1188
1189 static int special_address_create(const char *path, bool writable) {
1190 _cleanup_close_ int fd = -1;
1191 struct stat st;
1192
1193 assert(path);
1194
1195 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1196 if (fd < 0)
1197 return -errno;
1198
1199 if (fstat(fd, &st) < 0)
1200 return -errno;
1201
1202 /* Check whether this is a /proc, /sys or /dev file or char device */
1203 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1204 return -EEXIST;
1205
1206 return TAKE_FD(fd);
1207 }
1208
1209 static int usbffs_address_create(const char *path) {
1210 _cleanup_close_ int fd = -1;
1211 struct stat st;
1212
1213 assert(path);
1214
1215 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1216 if (fd < 0)
1217 return -errno;
1218
1219 if (fstat(fd, &st) < 0)
1220 return -errno;
1221
1222 /* Check whether this is a regular file (ffs endpoint) */
1223 if (!S_ISREG(st.st_mode))
1224 return -EEXIST;
1225
1226 return TAKE_FD(fd);
1227 }
1228
1229 static int mq_address_create(
1230 const char *path,
1231 mode_t mq_mode,
1232 long maxmsg,
1233 long msgsize) {
1234
1235 _cleanup_close_ int fd = -1;
1236 struct stat st;
1237 mode_t old_mask;
1238 struct mq_attr _attr, *attr = NULL;
1239
1240 assert(path);
1241
1242 if (maxmsg > 0 && msgsize > 0) {
1243 _attr = (struct mq_attr) {
1244 .mq_flags = O_NONBLOCK,
1245 .mq_maxmsg = maxmsg,
1246 .mq_msgsize = msgsize,
1247 };
1248 attr = &_attr;
1249 }
1250
1251 /* Enforce the right access mode for the mq */
1252 old_mask = umask(~mq_mode);
1253
1254 /* Include the original umask in our mask */
1255 (void) umask(~mq_mode | old_mask);
1256 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1257 (void) umask(old_mask);
1258
1259 if (fd < 0)
1260 return -errno;
1261
1262 if (fstat(fd, &st) < 0)
1263 return -errno;
1264
1265 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1266 st.st_uid != getuid() ||
1267 st.st_gid != getgid())
1268 return -EEXIST;
1269
1270 return TAKE_FD(fd);
1271 }
1272
1273 static int socket_symlink(Socket *s) {
1274 const char *p;
1275 char **i;
1276 int r;
1277
1278 assert(s);
1279
1280 p = socket_find_symlink_target(s);
1281 if (!p)
1282 return 0;
1283
1284 STRV_FOREACH(i, s->symlinks) {
1285 (void) mkdir_parents_label(*i, s->directory_mode);
1286
1287 r = symlink_idempotent(p, *i, false);
1288
1289 if (r == -EEXIST && s->remove_on_stop) {
1290 /* If there's already something where we want to create the symlink, and the destructive
1291 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1292 * again. */
1293
1294 if (unlink(*i) >= 0)
1295 r = symlink_idempotent(p, *i, false);
1296 }
1297
1298 if (r < 0)
1299 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1300 }
1301
1302 return 0;
1303 }
1304
1305 static int usbffs_write_descs(int fd, Service *s) {
1306 int r;
1307
1308 if (!s->usb_function_descriptors || !s->usb_function_strings)
1309 return -EINVAL;
1310
1311 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1312 if (r < 0)
1313 return r;
1314
1315 return copy_file_fd(s->usb_function_strings, fd, 0);
1316 }
1317
1318 static int usbffs_select_ep(const struct dirent *d) {
1319 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1320 }
1321
1322 static int usbffs_dispatch_eps(SocketPort *p) {
1323 _cleanup_free_ struct dirent **ent = NULL;
1324 size_t n, k;
1325 int r;
1326
1327 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1328 if (r < 0)
1329 return -errno;
1330
1331 n = (size_t) r;
1332 p->auxiliary_fds = new(int, n);
1333 if (!p->auxiliary_fds) {
1334 r = -ENOMEM;
1335 goto clear;
1336 }
1337
1338 p->n_auxiliary_fds = n;
1339
1340 k = 0;
1341 for (size_t i = 0; i < n; ++i) {
1342 _cleanup_free_ char *ep = NULL;
1343
1344 ep = path_make_absolute(ent[i]->d_name, p->path);
1345 if (!ep) {
1346 r = -ENOMEM;
1347 goto fail;
1348 }
1349
1350 path_simplify(ep, false);
1351
1352 r = usbffs_address_create(ep);
1353 if (r < 0)
1354 goto fail;
1355
1356 p->auxiliary_fds[k++] = r;
1357 }
1358
1359 r = 0;
1360 goto clear;
1361
1362 fail:
1363 close_many(p->auxiliary_fds, k);
1364 p->auxiliary_fds = mfree(p->auxiliary_fds);
1365 p->n_auxiliary_fds = 0;
1366
1367 clear:
1368 for (size_t i = 0; i < n; ++i)
1369 free(ent[i]);
1370
1371 return r;
1372 }
1373
1374 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1375 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1376 *
1377 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1378 * instance name.
1379 */
1380
1381 if (UNIT_ISSET(s->service)) {
1382 *ret = UNIT_DEREF(s->service);
1383 return 0;
1384 }
1385
1386 if (!s->accept)
1387 return -ENODATA;
1388
1389 /* Build the instance name and load the unit */
1390 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1391 int r;
1392
1393 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1394 if (r < 0)
1395 return r;
1396
1397 if (cfd >= 0) {
1398 r = instance_from_socket(cfd, s->n_accepted, &instance);
1399 if (ERRNO_IS_DISCONNECT(r))
1400 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1401 * different errors. This connection is over, but the socket unit lives on. */
1402 return log_unit_debug_errno(UNIT(s), r,
1403 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1404 errno_to_name(r));
1405 if (r < 0)
1406 return r;
1407 }
1408
1409 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1410 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1411 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1412 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1413 if (r < 0)
1414 return r;
1415
1416 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1417 }
1418
1419 static int socket_determine_selinux_label(Socket *s, char **ret) {
1420 int r;
1421
1422 assert(s);
1423 assert(ret);
1424
1425 if (s->selinux_context_from_net) {
1426 /* If this is requested, get the label from the network label */
1427
1428 r = mac_selinux_get_our_label(ret);
1429 if (r == -EOPNOTSUPP)
1430 goto no_label;
1431
1432 } else {
1433 /* Otherwise, get it from the executable we are about to start. */
1434
1435 Unit *service;
1436 ExecCommand *c;
1437 _cleanup_free_ char *path = NULL;
1438
1439 r = socket_load_service_unit(s, -1, &service);
1440 if (r == -ENODATA)
1441 goto no_label;
1442 if (r < 0)
1443 return r;
1444
1445 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1446 if (!c)
1447 goto no_label;
1448
1449 r = chase_symlinks(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1450 if (r < 0)
1451 goto no_label;
1452
1453 r = mac_selinux_get_create_label_from_exe(path, ret);
1454 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1455 goto no_label;
1456 }
1457
1458 return r;
1459
1460 no_label:
1461 *ret = NULL;
1462 return 0;
1463 }
1464
1465 static int socket_address_listen_do(
1466 Socket *s,
1467 const SocketAddress *address,
1468 const char *label) {
1469
1470 assert(s);
1471 assert(address);
1472
1473 return socket_address_listen(
1474 address,
1475 SOCK_CLOEXEC|SOCK_NONBLOCK,
1476 s->backlog,
1477 s->bind_ipv6_only,
1478 s->bind_to_device,
1479 s->reuse_port,
1480 s->free_bind,
1481 s->transparent,
1482 s->directory_mode,
1483 s->socket_mode,
1484 label);
1485 }
1486
1487 #define log_address_error_errno(u, address, error, fmt) \
1488 ({ \
1489 _cleanup_free_ char *_t = NULL; \
1490 \
1491 (void) socket_address_print(address, &_t); \
1492 log_unit_error_errno(u, error, fmt, strna(_t)); \
1493 })
1494
1495 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1496 int r;
1497
1498 assert(address);
1499 assert(context);
1500
1501 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1502
1503 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1504 r = bpf_firewall_supported();
1505 if (r < 0)
1506 return r;
1507 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1508 return true;
1509 }
1510
1511 return context->private_network || context->network_namespace_path;
1512 }
1513
1514 static int socket_address_listen_in_cgroup(
1515 Socket *s,
1516 const SocketAddress *address,
1517 const char *label) {
1518
1519 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1520 int fd, r;
1521 pid_t pid;
1522
1523 assert(s);
1524 assert(address);
1525
1526 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1527 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1528 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1529 * such. */
1530
1531 r = fork_needed(address, &s->exec_context);
1532 if (r < 0)
1533 return r;
1534 if (r == 0) {
1535 /* Shortcut things... */
1536 fd = socket_address_listen_do(s, address, label);
1537 if (fd < 0)
1538 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1539
1540 return fd;
1541 }
1542
1543 r = unit_setup_exec_runtime(UNIT(s));
1544 if (r < 0)
1545 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1546
1547 if (s->exec_context.network_namespace_path &&
1548 s->exec_runtime &&
1549 s->exec_runtime->netns_storage_socket[0] >= 0) {
1550 r = open_netns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path);
1551 if (r < 0)
1552 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1553 }
1554
1555 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1556 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1557
1558 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1559 if (r < 0)
1560 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1561 if (r == 0) {
1562 /* Child */
1563
1564 pair[0] = safe_close(pair[0]);
1565
1566 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1567 s->exec_runtime &&
1568 s->exec_runtime->netns_storage_socket[0] >= 0) {
1569
1570 if (ns_type_supported(NAMESPACE_NET)) {
1571 r = setup_netns(s->exec_runtime->netns_storage_socket);
1572 if (r < 0) {
1573 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1574 _exit(EXIT_NETWORK);
1575 }
1576 } else if (s->exec_context.network_namespace_path) {
1577 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1578 _exit(EXIT_NETWORK);
1579 } else
1580 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1581 }
1582
1583 fd = socket_address_listen_do(s, address, label);
1584 if (fd < 0) {
1585 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1586 _exit(EXIT_FAILURE);
1587 }
1588
1589 r = send_one_fd(pair[1], fd, 0);
1590 if (r < 0) {
1591 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1592 _exit(EXIT_FAILURE);
1593 }
1594
1595 _exit(EXIT_SUCCESS);
1596 }
1597
1598 pair[1] = safe_close(pair[1]);
1599 fd = receive_one_fd(pair[0], 0);
1600
1601 /* We synchronously wait for the helper, as it shouldn't be slow */
1602 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1603 if (r < 0) {
1604 safe_close(fd);
1605 return r;
1606 }
1607
1608 if (fd < 0)
1609 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1610
1611 return fd;
1612 }
1613
1614 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1615
1616 static int socket_open_fds(Socket *orig_s) {
1617 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1618 _cleanup_(mac_selinux_freep) char *label = NULL;
1619 bool know_label = false;
1620 SocketPort *p;
1621 int r;
1622
1623 assert(s);
1624
1625 LIST_FOREACH(port, p, s->ports) {
1626
1627 if (p->fd >= 0)
1628 continue;
1629
1630 switch (p->type) {
1631
1632 case SOCKET_SOCKET:
1633
1634 if (!know_label) {
1635 /* Figure out the label, if we don't it know yet. We do it once for the first
1636 * socket where we need this and remember it for the rest. */
1637
1638 r = socket_determine_selinux_label(s, &label);
1639 if (r < 0)
1640 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1641
1642 know_label = true;
1643 }
1644
1645 /* Apply the socket protocol */
1646 switch (p->address.type) {
1647
1648 case SOCK_STREAM:
1649 case SOCK_SEQPACKET:
1650 if (s->socket_protocol == IPPROTO_SCTP)
1651 p->address.protocol = s->socket_protocol;
1652 break;
1653
1654 case SOCK_DGRAM:
1655 if (s->socket_protocol == IPPROTO_UDPLITE)
1656 p->address.protocol = s->socket_protocol;
1657 break;
1658 }
1659
1660 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1661 if (p->fd < 0)
1662 return p->fd;
1663
1664 socket_apply_socket_options(s, p, p->fd);
1665 socket_symlink(s);
1666 break;
1667
1668 case SOCKET_SPECIAL:
1669
1670 p->fd = special_address_create(p->path, s->writable);
1671 if (p->fd < 0)
1672 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1673 break;
1674
1675 case SOCKET_FIFO:
1676
1677 p->fd = fifo_address_create(
1678 p->path,
1679 s->directory_mode,
1680 s->socket_mode);
1681 if (p->fd < 0)
1682 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1683
1684 socket_apply_fifo_options(s, p->fd);
1685 socket_symlink(s);
1686 break;
1687
1688 case SOCKET_MQUEUE:
1689
1690 p->fd = mq_address_create(
1691 p->path,
1692 s->socket_mode,
1693 s->mq_maxmsg,
1694 s->mq_msgsize);
1695 if (p->fd < 0)
1696 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1697 break;
1698
1699 case SOCKET_USB_FUNCTION: {
1700 _cleanup_free_ char *ep = NULL;
1701
1702 ep = path_make_absolute("ep0", p->path);
1703 if (!ep)
1704 return -ENOMEM;
1705
1706 p->fd = usbffs_address_create(ep);
1707 if (p->fd < 0)
1708 return p->fd;
1709
1710 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1711 if (r < 0)
1712 return r;
1713
1714 r = usbffs_dispatch_eps(p);
1715 if (r < 0)
1716 return r;
1717
1718 break;
1719 }
1720 default:
1721 assert_not_reached("Unknown port type");
1722 }
1723 }
1724
1725 s = NULL;
1726 return 0;
1727 }
1728
1729 static void socket_unwatch_fds(Socket *s) {
1730 SocketPort *p;
1731 int r;
1732
1733 assert(s);
1734
1735 LIST_FOREACH(port, p, s->ports) {
1736 if (p->fd < 0)
1737 continue;
1738
1739 if (!p->event_source)
1740 continue;
1741
1742 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1743 if (r < 0)
1744 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1745 }
1746 }
1747
1748 static int socket_watch_fds(Socket *s) {
1749 SocketPort *p;
1750 int r;
1751
1752 assert(s);
1753
1754 LIST_FOREACH(port, p, s->ports) {
1755 if (p->fd < 0)
1756 continue;
1757
1758 if (p->event_source) {
1759 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1760 if (r < 0)
1761 goto fail;
1762 } else {
1763 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1764 if (r < 0)
1765 goto fail;
1766
1767 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1768 }
1769 }
1770
1771 return 0;
1772
1773 fail:
1774 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1775 socket_unwatch_fds(s);
1776 return r;
1777 }
1778
1779 enum {
1780 SOCKET_OPEN_NONE,
1781 SOCKET_OPEN_SOME,
1782 SOCKET_OPEN_ALL,
1783 };
1784
1785 static int socket_check_open(Socket *s) {
1786 bool have_open = false, have_closed = false;
1787 SocketPort *p;
1788
1789 assert(s);
1790
1791 LIST_FOREACH(port, p, s->ports) {
1792 if (p->fd < 0)
1793 have_closed = true;
1794 else
1795 have_open = true;
1796
1797 if (have_open && have_closed)
1798 return SOCKET_OPEN_SOME;
1799 }
1800
1801 if (have_open)
1802 return SOCKET_OPEN_ALL;
1803
1804 return SOCKET_OPEN_NONE;
1805 }
1806
1807 static void socket_set_state(Socket *s, SocketState state) {
1808 SocketState old_state;
1809 assert(s);
1810
1811 if (s->state != state)
1812 bus_unit_send_pending_change_signal(UNIT(s), false);
1813
1814 old_state = s->state;
1815 s->state = state;
1816
1817 if (!IN_SET(state,
1818 SOCKET_START_PRE,
1819 SOCKET_START_CHOWN,
1820 SOCKET_START_POST,
1821 SOCKET_STOP_PRE,
1822 SOCKET_STOP_PRE_SIGTERM,
1823 SOCKET_STOP_PRE_SIGKILL,
1824 SOCKET_STOP_POST,
1825 SOCKET_FINAL_SIGTERM,
1826 SOCKET_FINAL_SIGKILL,
1827 SOCKET_CLEANING)) {
1828
1829 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1830 socket_unwatch_control_pid(s);
1831 s->control_command = NULL;
1832 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1833 }
1834
1835 if (state != SOCKET_LISTENING)
1836 socket_unwatch_fds(s);
1837
1838 if (!IN_SET(state,
1839 SOCKET_START_CHOWN,
1840 SOCKET_START_POST,
1841 SOCKET_LISTENING,
1842 SOCKET_RUNNING,
1843 SOCKET_STOP_PRE,
1844 SOCKET_STOP_PRE_SIGTERM,
1845 SOCKET_STOP_PRE_SIGKILL,
1846 SOCKET_CLEANING))
1847 socket_close_fds(s);
1848
1849 if (state != old_state)
1850 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1851
1852 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1853 }
1854
1855 static int socket_coldplug(Unit *u) {
1856 Socket *s = SOCKET(u);
1857 int r;
1858
1859 assert(s);
1860 assert(s->state == SOCKET_DEAD);
1861
1862 if (s->deserialized_state == s->state)
1863 return 0;
1864
1865 if (s->control_pid > 0 &&
1866 pid_is_unwaited(s->control_pid) &&
1867 IN_SET(s->deserialized_state,
1868 SOCKET_START_PRE,
1869 SOCKET_START_CHOWN,
1870 SOCKET_START_POST,
1871 SOCKET_STOP_PRE,
1872 SOCKET_STOP_PRE_SIGTERM,
1873 SOCKET_STOP_PRE_SIGKILL,
1874 SOCKET_STOP_POST,
1875 SOCKET_FINAL_SIGTERM,
1876 SOCKET_FINAL_SIGKILL,
1877 SOCKET_CLEANING)) {
1878
1879 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1880 if (r < 0)
1881 return r;
1882
1883 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1884 if (r < 0)
1885 return r;
1886 }
1887
1888 if (IN_SET(s->deserialized_state,
1889 SOCKET_START_CHOWN,
1890 SOCKET_START_POST,
1891 SOCKET_LISTENING,
1892 SOCKET_RUNNING)) {
1893
1894 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1895 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1896 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1897 * and if there's a mismatch, warn loudly. */
1898
1899 r = socket_check_open(s);
1900 if (r == SOCKET_OPEN_NONE)
1901 log_unit_warning(UNIT(s),
1902 "Socket unit configuration has changed while unit has been running, "
1903 "no open socket file descriptor left. "
1904 "The socket unit is not functional until restarted.");
1905 else if (r == SOCKET_OPEN_SOME)
1906 log_unit_warning(UNIT(s),
1907 "Socket unit configuration has changed while unit has been running, "
1908 "and some socket file descriptors have not been opened yet. "
1909 "The socket unit is not fully functional until restarted.");
1910 }
1911
1912 if (s->deserialized_state == SOCKET_LISTENING) {
1913 r = socket_watch_fds(s);
1914 if (r < 0)
1915 return r;
1916 }
1917
1918 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1919 (void) unit_setup_dynamic_creds(u);
1920 (void) unit_setup_exec_runtime(u);
1921 }
1922
1923 socket_set_state(s, s->deserialized_state);
1924 return 0;
1925 }
1926
1927 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1928
1929 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1930 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1931 .stdin_fd = -1,
1932 .stdout_fd = -1,
1933 .stderr_fd = -1,
1934 .exec_fd = -1,
1935 };
1936 pid_t pid;
1937 int r;
1938
1939 assert(s);
1940 assert(c);
1941 assert(_pid);
1942
1943 r = unit_prepare_exec(UNIT(s));
1944 if (r < 0)
1945 return r;
1946
1947 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1948 if (r < 0)
1949 return r;
1950
1951 r = unit_set_exec_params(UNIT(s), &exec_params);
1952 if (r < 0)
1953 return r;
1954
1955 r = exec_spawn(UNIT(s),
1956 c,
1957 &s->exec_context,
1958 &exec_params,
1959 s->exec_runtime,
1960 &s->dynamic_creds,
1961 &pid);
1962 if (r < 0)
1963 return r;
1964
1965 r = unit_watch_pid(UNIT(s), pid, true);
1966 if (r < 0)
1967 return r;
1968
1969 *_pid = pid;
1970
1971 return 0;
1972 }
1973
1974 static int socket_chown(Socket *s, pid_t *_pid) {
1975 pid_t pid;
1976 int r;
1977
1978 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1979 if (r < 0)
1980 goto fail;
1981
1982 /* We have to resolve the user names out-of-process, hence
1983 * let's fork here. It's messy, but well, what can we do? */
1984
1985 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1986 if (r < 0)
1987 return r;
1988 if (r == 0) {
1989 uid_t uid = UID_INVALID;
1990 gid_t gid = GID_INVALID;
1991 SocketPort *p;
1992
1993 /* Child */
1994
1995 if (!isempty(s->user)) {
1996 const char *user = s->user;
1997
1998 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1999 if (r < 0) {
2000 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2001 _exit(EXIT_USER);
2002 }
2003 }
2004
2005 if (!isempty(s->group)) {
2006 const char *group = s->group;
2007
2008 r = get_group_creds(&group, &gid, 0);
2009 if (r < 0) {
2010 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2011 _exit(EXIT_GROUP);
2012 }
2013 }
2014
2015 LIST_FOREACH(port, p, s->ports) {
2016 const char *path = NULL;
2017
2018 if (p->type == SOCKET_SOCKET)
2019 path = socket_address_get_path(&p->address);
2020 else if (p->type == SOCKET_FIFO)
2021 path = p->path;
2022
2023 if (!path)
2024 continue;
2025
2026 if (chown(path, uid, gid) < 0) {
2027 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2028 _exit(EXIT_CHOWN);
2029 }
2030 }
2031
2032 _exit(EXIT_SUCCESS);
2033 }
2034
2035 r = unit_watch_pid(UNIT(s), pid, true);
2036 if (r < 0)
2037 goto fail;
2038
2039 *_pid = pid;
2040 return 0;
2041
2042 fail:
2043 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
2044 return r;
2045 }
2046
2047 static void socket_enter_dead(Socket *s, SocketResult f) {
2048 assert(s);
2049
2050 if (s->result == SOCKET_SUCCESS)
2051 s->result = f;
2052
2053 if (s->result == SOCKET_SUCCESS)
2054 unit_log_success(UNIT(s));
2055 else
2056 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2057
2058 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2059
2060 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2061
2062 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2063
2064 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2065
2066 unit_unref_uid_gid(UNIT(s), true);
2067
2068 dynamic_creds_destroy(&s->dynamic_creds);
2069 }
2070
2071 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2072
2073 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2074 int r;
2075 assert(s);
2076
2077 if (s->result == SOCKET_SUCCESS)
2078 s->result = f;
2079
2080 socket_unwatch_control_pid(s);
2081 s->control_command_id = SOCKET_EXEC_STOP_POST;
2082 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2083
2084 if (s->control_command) {
2085 r = socket_spawn(s, s->control_command, &s->control_pid);
2086 if (r < 0)
2087 goto fail;
2088
2089 socket_set_state(s, SOCKET_STOP_POST);
2090 } else
2091 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2092
2093 return;
2094
2095 fail:
2096 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2097 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2098 }
2099
2100 static int state_to_kill_operation(Socket *s, SocketState state) {
2101 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2102 return KILL_RESTART;
2103
2104 if (state == SOCKET_FINAL_SIGTERM)
2105 return KILL_TERMINATE;
2106
2107 return KILL_KILL;
2108 }
2109
2110 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2111 int r;
2112
2113 assert(s);
2114
2115 if (s->result == SOCKET_SUCCESS)
2116 s->result = f;
2117
2118 r = unit_kill_context(
2119 UNIT(s),
2120 &s->kill_context,
2121 state_to_kill_operation(s, state),
2122 -1,
2123 s->control_pid,
2124 false);
2125 if (r < 0)
2126 goto fail;
2127
2128 if (r > 0) {
2129 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2130 if (r < 0)
2131 goto fail;
2132
2133 socket_set_state(s, state);
2134 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2135 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2136 else if (state == SOCKET_STOP_PRE_SIGKILL)
2137 socket_enter_stop_post(s, SOCKET_SUCCESS);
2138 else if (state == SOCKET_FINAL_SIGTERM)
2139 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2140 else
2141 socket_enter_dead(s, SOCKET_SUCCESS);
2142
2143 return;
2144
2145 fail:
2146 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2147
2148 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2149 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2150 else
2151 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2152 }
2153
2154 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2155 int r;
2156 assert(s);
2157
2158 if (s->result == SOCKET_SUCCESS)
2159 s->result = f;
2160
2161 socket_unwatch_control_pid(s);
2162 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2163 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2164
2165 if (s->control_command) {
2166 r = socket_spawn(s, s->control_command, &s->control_pid);
2167 if (r < 0)
2168 goto fail;
2169
2170 socket_set_state(s, SOCKET_STOP_PRE);
2171 } else
2172 socket_enter_stop_post(s, SOCKET_SUCCESS);
2173
2174 return;
2175
2176 fail:
2177 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2178 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2179 }
2180
2181 static void socket_enter_listening(Socket *s) {
2182 int r;
2183 assert(s);
2184
2185 if (!s->accept && s->flush_pending) {
2186 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2187 flush_ports(s);
2188 }
2189
2190 r = socket_watch_fds(s);
2191 if (r < 0) {
2192 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2193 goto fail;
2194 }
2195
2196 socket_set_state(s, SOCKET_LISTENING);
2197 return;
2198
2199 fail:
2200 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2201 }
2202
2203 static void socket_enter_start_post(Socket *s) {
2204 int r;
2205 assert(s);
2206
2207 socket_unwatch_control_pid(s);
2208 s->control_command_id = SOCKET_EXEC_START_POST;
2209 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2210
2211 if (s->control_command) {
2212 r = socket_spawn(s, s->control_command, &s->control_pid);
2213 if (r < 0) {
2214 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2215 goto fail;
2216 }
2217
2218 socket_set_state(s, SOCKET_START_POST);
2219 } else
2220 socket_enter_listening(s);
2221
2222 return;
2223
2224 fail:
2225 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2226 }
2227
2228 static void socket_enter_start_chown(Socket *s) {
2229 int r;
2230
2231 assert(s);
2232
2233 r = socket_open_fds(s);
2234 if (r < 0) {
2235 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2236 goto fail;
2237 }
2238
2239 if (!isempty(s->user) || !isempty(s->group)) {
2240
2241 socket_unwatch_control_pid(s);
2242 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2243 s->control_command = NULL;
2244
2245 r = socket_chown(s, &s->control_pid);
2246 if (r < 0) {
2247 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2248 goto fail;
2249 }
2250
2251 socket_set_state(s, SOCKET_START_CHOWN);
2252 } else
2253 socket_enter_start_post(s);
2254
2255 return;
2256
2257 fail:
2258 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2259 }
2260
2261 static void socket_enter_start_pre(Socket *s) {
2262 int r;
2263 assert(s);
2264
2265 socket_unwatch_control_pid(s);
2266
2267 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2268
2269 s->control_command_id = SOCKET_EXEC_START_PRE;
2270 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2271
2272 if (s->control_command) {
2273 r = socket_spawn(s, s->control_command, &s->control_pid);
2274 if (r < 0) {
2275 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2276 goto fail;
2277 }
2278
2279 socket_set_state(s, SOCKET_START_PRE);
2280 } else
2281 socket_enter_start_chown(s);
2282
2283 return;
2284
2285 fail:
2286 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2287 }
2288
2289 static void flush_ports(Socket *s) {
2290 SocketPort *p;
2291
2292 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2293 * anymore */
2294
2295 LIST_FOREACH(port, p, s->ports) {
2296 if (p->fd < 0)
2297 continue;
2298
2299 (void) flush_accept(p->fd);
2300 (void) flush_fd(p->fd);
2301 }
2302 }
2303
2304 static void socket_enter_running(Socket *s, int cfd_in) {
2305 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2306 * somewhere or close it. */
2307 _cleanup_close_ int cfd = cfd_in;
2308
2309 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2310 int r;
2311
2312 assert(s);
2313
2314 /* We don't take connections anymore if we are supposed to shut down anyway */
2315 if (unit_stop_pending(UNIT(s))) {
2316
2317 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2318
2319 if (cfd >= 0)
2320 goto refuse;
2321
2322 flush_ports(s);
2323 return;
2324 }
2325
2326 if (!ratelimit_below(&s->trigger_limit)) {
2327 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2328 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2329 goto refuse;
2330 }
2331
2332 if (cfd < 0) {
2333 bool pending = false;
2334 Unit *other;
2335 void *v;
2336
2337 /* If there's already a start pending don't bother to
2338 * do anything */
2339 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS])
2340 if (unit_active_or_pending(other)) {
2341 pending = true;
2342 break;
2343 }
2344
2345 if (!pending) {
2346 if (!UNIT_ISSET(s->service)) {
2347 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2348 "Service to activate vanished, refusing activation.");
2349 goto fail;
2350 }
2351
2352 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2353 if (r < 0)
2354 goto fail;
2355 }
2356
2357 socket_set_state(s, SOCKET_RUNNING);
2358 } else {
2359 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2360 Unit *service;
2361
2362 if (s->n_connections >= s->max_connections) {
2363 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2364 s->n_connections);
2365 goto refuse;
2366 }
2367
2368 if (s->max_connections_per_source > 0) {
2369 r = socket_acquire_peer(s, cfd, &p);
2370 if (ERRNO_IS_DISCONNECT(r))
2371 return;
2372 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2373 goto fail;
2374 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2375 _cleanup_free_ char *t = NULL;
2376
2377 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2378
2379 log_unit_warning(UNIT(s),
2380 "Too many incoming connections (%u) from source %s, dropping connection.",
2381 p->n_ref, strnull(t));
2382 goto refuse;
2383 }
2384 }
2385
2386 r = socket_load_service_unit(s, cfd, &service);
2387 if (ERRNO_IS_DISCONNECT(r))
2388 return;
2389 if (r < 0)
2390 goto fail;
2391
2392 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2393 false, UNIT_DEPENDENCY_IMPLICIT);
2394 if (r < 0)
2395 goto fail;
2396
2397 s->n_accepted++;
2398
2399 r = service_set_socket_fd(SERVICE(service), cfd, s, s->selinux_context_from_net);
2400 if (ERRNO_IS_DISCONNECT(r))
2401 return;
2402 if (r < 0)
2403 goto fail;
2404
2405 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2406 s->n_connections++;
2407
2408 SERVICE(service)->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2409
2410 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2411 if (r < 0) {
2412 /* We failed to activate the new service, but it still exists. Let's make sure the
2413 * service closes and forgets the connection fd again, immediately. */
2414 service_close_socket_fd(SERVICE(service));
2415 goto fail;
2416 }
2417
2418 /* Notify clients about changed counters */
2419 unit_add_to_dbus_queue(UNIT(s));
2420 }
2421
2422 TAKE_FD(cfd);
2423 return;
2424
2425 refuse:
2426 s->n_refused++;
2427 return;
2428
2429 fail:
2430 if (ERRNO_IS_RESOURCE(r))
2431 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2432 bus_error_message(&error, r));
2433 else
2434 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2435 cfd >= 0 ? "template" : "non-template",
2436 bus_error_message(&error, r));
2437
2438 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2439 }
2440
2441 static void socket_run_next(Socket *s) {
2442 int r;
2443
2444 assert(s);
2445 assert(s->control_command);
2446 assert(s->control_command->command_next);
2447
2448 socket_unwatch_control_pid(s);
2449
2450 s->control_command = s->control_command->command_next;
2451
2452 r = socket_spawn(s, s->control_command, &s->control_pid);
2453 if (r < 0)
2454 goto fail;
2455
2456 return;
2457
2458 fail:
2459 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2460
2461 if (s->state == SOCKET_START_POST)
2462 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2463 else if (s->state == SOCKET_STOP_POST)
2464 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2465 else
2466 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2467 }
2468
2469 static int socket_start(Unit *u) {
2470 Socket *s = SOCKET(u);
2471 int r;
2472
2473 assert(s);
2474
2475 /* We cannot fulfill this request right now, try again later
2476 * please! */
2477 if (IN_SET(s->state,
2478 SOCKET_STOP_PRE,
2479 SOCKET_STOP_PRE_SIGKILL,
2480 SOCKET_STOP_PRE_SIGTERM,
2481 SOCKET_STOP_POST,
2482 SOCKET_FINAL_SIGTERM,
2483 SOCKET_FINAL_SIGKILL,
2484 SOCKET_CLEANING))
2485 return -EAGAIN;
2486
2487 /* Already on it! */
2488 if (IN_SET(s->state,
2489 SOCKET_START_PRE,
2490 SOCKET_START_CHOWN,
2491 SOCKET_START_POST))
2492 return 0;
2493
2494 /* Cannot run this without the service being around */
2495 if (UNIT_ISSET(s->service)) {
2496 Service *service;
2497
2498 service = SERVICE(UNIT_DEREF(s->service));
2499
2500 if (UNIT(service)->load_state != UNIT_LOADED)
2501 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2502
2503 /* If the service is already active we cannot start the
2504 * socket */
2505 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
2506 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2507 }
2508
2509 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2510
2511 r = unit_test_start_limit(u);
2512 if (r < 0) {
2513 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2514 return r;
2515 }
2516
2517 r = unit_acquire_invocation_id(u);
2518 if (r < 0)
2519 return r;
2520
2521 s->result = SOCKET_SUCCESS;
2522 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2523
2524 u->reset_accounting = true;
2525
2526 socket_enter_start_pre(s);
2527 return 1;
2528 }
2529
2530 static int socket_stop(Unit *u) {
2531 Socket *s = SOCKET(u);
2532
2533 assert(s);
2534
2535 /* Already on it */
2536 if (IN_SET(s->state,
2537 SOCKET_STOP_PRE,
2538 SOCKET_STOP_PRE_SIGTERM,
2539 SOCKET_STOP_PRE_SIGKILL,
2540 SOCKET_STOP_POST,
2541 SOCKET_FINAL_SIGTERM,
2542 SOCKET_FINAL_SIGKILL))
2543 return 0;
2544
2545 /* If there's already something running we go directly into
2546 * kill mode. */
2547 if (IN_SET(s->state,
2548 SOCKET_START_PRE,
2549 SOCKET_START_CHOWN,
2550 SOCKET_START_POST)) {
2551 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2552 return -EAGAIN;
2553 }
2554
2555 /* If we are currently cleaning, then abort it, brutally. */
2556 if (s->state == SOCKET_CLEANING) {
2557 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2558 return 0;
2559 }
2560
2561 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2562
2563 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2564 return 1;
2565 }
2566
2567 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2568 Socket *s = SOCKET(u);
2569 SocketPort *p;
2570 int r;
2571
2572 assert(u);
2573 assert(f);
2574 assert(fds);
2575
2576 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2577 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2578 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2579 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2580
2581 if (s->control_pid > 0)
2582 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2583
2584 if (s->control_command_id >= 0)
2585 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2586
2587 LIST_FOREACH(port, p, s->ports) {
2588 int copy;
2589
2590 if (p->fd < 0)
2591 continue;
2592
2593 copy = fdset_put_dup(fds, p->fd);
2594 if (copy < 0)
2595 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2596
2597 if (p->type == SOCKET_SOCKET) {
2598 _cleanup_free_ char *t = NULL;
2599
2600 r = socket_address_print(&p->address, &t);
2601 if (r < 0)
2602 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2603
2604 if (socket_address_family(&p->address) == AF_NETLINK)
2605 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2606 else
2607 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2608 } else if (p->type == SOCKET_SPECIAL)
2609 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2610 else if (p->type == SOCKET_MQUEUE)
2611 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2612 else if (p->type == SOCKET_USB_FUNCTION)
2613 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2614 else {
2615 assert(p->type == SOCKET_FIFO);
2616 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2617 }
2618 }
2619
2620 return 0;
2621 }
2622
2623 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2624 assert(p);
2625
2626 safe_close(p->fd);
2627 p->fd = fdset_remove(fds, fd);
2628 }
2629
2630 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2631 Socket *s = SOCKET(u);
2632
2633 assert(u);
2634 assert(key);
2635 assert(value);
2636
2637 if (streq(key, "state")) {
2638 SocketState state;
2639
2640 state = socket_state_from_string(value);
2641 if (state < 0)
2642 log_unit_debug(u, "Failed to parse state value: %s", value);
2643 else
2644 s->deserialized_state = state;
2645 } else if (streq(key, "result")) {
2646 SocketResult f;
2647
2648 f = socket_result_from_string(value);
2649 if (f < 0)
2650 log_unit_debug(u, "Failed to parse result value: %s", value);
2651 else if (f != SOCKET_SUCCESS)
2652 s->result = f;
2653
2654 } else if (streq(key, "n-accepted")) {
2655 unsigned k;
2656
2657 if (safe_atou(value, &k) < 0)
2658 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2659 else
2660 s->n_accepted += k;
2661 } else if (streq(key, "n-refused")) {
2662 unsigned k;
2663
2664 if (safe_atou(value, &k) < 0)
2665 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2666 else
2667 s->n_refused += k;
2668 } else if (streq(key, "control-pid")) {
2669 pid_t pid;
2670
2671 if (parse_pid(value, &pid) < 0)
2672 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2673 else
2674 s->control_pid = pid;
2675 } else if (streq(key, "control-command")) {
2676 SocketExecCommand id;
2677
2678 id = socket_exec_command_from_string(value);
2679 if (id < 0)
2680 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2681 else {
2682 s->control_command_id = id;
2683 s->control_command = s->exec_command[id];
2684 }
2685 } else if (streq(key, "fifo")) {
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 fifo value: %s", value);
2691 else
2692 LIST_FOREACH(port, p, s->ports)
2693 if (p->type == SOCKET_FIFO &&
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 if (streq(key, "special")) {
2700 int fd, skip = 0;
2701 SocketPort *p;
2702
2703 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2704 log_unit_debug(u, "Failed to parse special value: %s", value);
2705 else
2706 LIST_FOREACH(port, p, s->ports)
2707 if (p->type == SOCKET_SPECIAL &&
2708 path_equal_or_files_same(p->path, value+skip, 0)) {
2709 socket_port_take_fd(p, fds, fd);
2710 break;
2711 }
2712
2713 } else if (streq(key, "mqueue")) {
2714 int fd, skip = 0;
2715 SocketPort *p;
2716
2717 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2718 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2719 else
2720 LIST_FOREACH(port, p, s->ports)
2721 if (p->type == SOCKET_MQUEUE &&
2722 streq(p->path, value+skip)) {
2723 socket_port_take_fd(p, fds, fd);
2724 break;
2725 }
2726
2727 } else if (streq(key, "socket")) {
2728 int fd, type, skip = 0;
2729 SocketPort *p;
2730
2731 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2732 log_unit_debug(u, "Failed to parse socket value: %s", value);
2733 else
2734 LIST_FOREACH(port, p, s->ports)
2735 if (socket_address_is(&p->address, value+skip, type)) {
2736 socket_port_take_fd(p, fds, fd);
2737 break;
2738 }
2739
2740 } else if (streq(key, "netlink")) {
2741 int fd, skip = 0;
2742 SocketPort *p;
2743
2744 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2745 log_unit_debug(u, "Failed to parse socket value: %s", value);
2746 else
2747 LIST_FOREACH(port, p, s->ports)
2748 if (socket_address_is_netlink(&p->address, value+skip)) {
2749 socket_port_take_fd(p, fds, fd);
2750 break;
2751 }
2752
2753 } else if (streq(key, "ffs")) {
2754 int fd, skip = 0;
2755 SocketPort *p;
2756
2757 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2758 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2759 else
2760 LIST_FOREACH(port, p, s->ports)
2761 if (p->type == SOCKET_USB_FUNCTION &&
2762 path_equal_or_files_same(p->path, value+skip, 0)) {
2763 socket_port_take_fd(p, fds, fd);
2764 break;
2765 }
2766
2767 } else
2768 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2769
2770 return 0;
2771 }
2772
2773 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2774 Socket *s = SOCKET(u);
2775 SocketPort *p;
2776
2777 assert(u);
2778
2779 LIST_FOREACH(port, p, s->ports) {
2780 int fd;
2781
2782 if (p->type != SOCKET_SOCKET)
2783 continue;
2784
2785 if (p->fd >= 0)
2786 continue;
2787
2788 FDSET_FOREACH(fd, fds) {
2789 if (socket_address_matches_fd(&p->address, fd)) {
2790 p->fd = fdset_remove(fds, fd);
2791 s->deserialized_state = SOCKET_LISTENING;
2792 break;
2793 }
2794 }
2795 }
2796 }
2797
2798 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2799 assert(u);
2800
2801 return state_translation_table[SOCKET(u)->state];
2802 }
2803
2804 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2805 assert(u);
2806
2807 return socket_state_to_string(SOCKET(u)->state);
2808 }
2809
2810 const char* socket_port_type_to_string(SocketPort *p) {
2811
2812 assert(p);
2813
2814 switch (p->type) {
2815
2816 case SOCKET_SOCKET:
2817
2818 switch (p->address.type) {
2819
2820 case SOCK_STREAM:
2821 return "Stream";
2822
2823 case SOCK_DGRAM:
2824 return "Datagram";
2825
2826 case SOCK_SEQPACKET:
2827 return "SequentialPacket";
2828
2829 case SOCK_RAW:
2830 if (socket_address_family(&p->address) == AF_NETLINK)
2831 return "Netlink";
2832
2833 _fallthrough_;
2834 default:
2835 return NULL;
2836 }
2837
2838 case SOCKET_SPECIAL:
2839 return "Special";
2840
2841 case SOCKET_MQUEUE:
2842 return "MessageQueue";
2843
2844 case SOCKET_FIFO:
2845 return "FIFO";
2846
2847 case SOCKET_USB_FUNCTION:
2848 return "USBFunction";
2849
2850 default:
2851 return NULL;
2852 }
2853 }
2854
2855 SocketType socket_port_type_from_string(const char *s) {
2856 assert(s);
2857
2858 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2859 return SOCKET_SOCKET;
2860 else if (streq(s, "Special"))
2861 return SOCKET_SPECIAL;
2862 else if (streq(s, "MessageQueue"))
2863 return SOCKET_MQUEUE;
2864 else if (streq(s, "FIFO"))
2865 return SOCKET_FIFO;
2866 else if (streq(s, "USBFunction"))
2867 return SOCKET_USB_FUNCTION;
2868 else
2869 return _SOCKET_TYPE_INVALID;
2870 }
2871
2872 _pure_ static bool socket_may_gc(Unit *u) {
2873 Socket *s = SOCKET(u);
2874
2875 assert(u);
2876
2877 return s->n_connections == 0;
2878 }
2879
2880 static int socket_accept_do(Socket *s, int fd) {
2881 int cfd;
2882
2883 assert(s);
2884 assert(fd >= 0);
2885
2886 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2887 if (cfd < 0)
2888 /* Convert transient network errors into clean and well-defined EAGAIN */
2889 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2890
2891 return cfd;
2892 }
2893
2894 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2895 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2896 int cfd, r;
2897 pid_t pid;
2898
2899 assert(s);
2900 assert(p);
2901 assert(fd >= 0);
2902
2903 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2904 * connection socket is also properly associated with the cgroup. */
2905
2906 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2907 goto shortcut;
2908
2909 r = bpf_firewall_supported();
2910 if (r < 0)
2911 return r;
2912 if (r == BPF_FIREWALL_UNSUPPORTED)
2913 goto shortcut;
2914
2915 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2916 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2917
2918 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2919 if (r < 0)
2920 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2921 if (r == 0) {
2922 /* Child */
2923
2924 pair[0] = safe_close(pair[0]);
2925
2926 cfd = socket_accept_do(s, fd);
2927 if (cfd == -EAGAIN) /* spurious accept() */
2928 _exit(EXIT_SUCCESS);
2929 if (cfd < 0) {
2930 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2931 _exit(EXIT_FAILURE);
2932 }
2933
2934 r = send_one_fd(pair[1], cfd, 0);
2935 if (r < 0) {
2936 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2937 _exit(EXIT_FAILURE);
2938 }
2939
2940 _exit(EXIT_SUCCESS);
2941 }
2942
2943 pair[1] = safe_close(pair[1]);
2944 cfd = receive_one_fd(pair[0], 0);
2945
2946 /* We synchronously wait for the helper, as it shouldn't be slow */
2947 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2948 if (r < 0) {
2949 safe_close(cfd);
2950 return r;
2951 }
2952
2953 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2954 * this is a spurious accept(), let's convert that back to EAGAIN here. */
2955 if (cfd == -EIO)
2956 return -EAGAIN;
2957 if (cfd < 0)
2958 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2959
2960 return cfd;
2961
2962 shortcut:
2963 cfd = socket_accept_do(s, fd);
2964 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
2965 return -EAGAIN;
2966 if (cfd < 0)
2967 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2968
2969 return cfd;
2970 }
2971
2972 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2973 SocketPort *p = userdata;
2974 int cfd = -1;
2975
2976 assert(p);
2977 assert(fd >= 0);
2978
2979 if (p->socket->state != SOCKET_LISTENING)
2980 return 0;
2981
2982 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2983
2984 if (revents != EPOLLIN) {
2985 if (revents & EPOLLHUP)
2986 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.");
2987 else
2988 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2989 goto fail;
2990 }
2991
2992 if (p->socket->accept &&
2993 p->type == SOCKET_SOCKET &&
2994 socket_address_can_accept(&p->address)) {
2995
2996 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2997 if (cfd == -EAGAIN) /* Spurious accept() */
2998 return 0;
2999 if (cfd < 0)
3000 goto fail;
3001
3002 socket_apply_socket_options(p->socket, p, cfd);
3003 }
3004
3005 socket_enter_running(p->socket, cfd);
3006 return 0;
3007
3008 fail:
3009 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3010 return 0;
3011 }
3012
3013 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3014 Socket *s = SOCKET(u);
3015 SocketResult f;
3016
3017 assert(s);
3018 assert(pid >= 0);
3019
3020 if (pid != s->control_pid)
3021 return;
3022
3023 s->control_pid = 0;
3024
3025 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3026 f = SOCKET_SUCCESS;
3027 else if (code == CLD_EXITED)
3028 f = SOCKET_FAILURE_EXIT_CODE;
3029 else if (code == CLD_KILLED)
3030 f = SOCKET_FAILURE_SIGNAL;
3031 else if (code == CLD_DUMPED)
3032 f = SOCKET_FAILURE_CORE_DUMP;
3033 else
3034 assert_not_reached("Unknown sigchld code");
3035
3036 if (s->control_command) {
3037 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3038
3039 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3040 f = SOCKET_SUCCESS;
3041 }
3042
3043 unit_log_process_exit(
3044 u,
3045 "Control process",
3046 socket_exec_command_to_string(s->control_command_id),
3047 f == SOCKET_SUCCESS,
3048 code, status);
3049
3050 if (s->result == SOCKET_SUCCESS)
3051 s->result = f;
3052
3053 if (s->control_command &&
3054 s->control_command->command_next &&
3055 f == SOCKET_SUCCESS) {
3056
3057 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3058 socket_run_next(s);
3059 } else {
3060 s->control_command = NULL;
3061 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3062
3063 /* No further commands for this step, so let's figure
3064 * out what to do next */
3065
3066 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3067
3068 switch (s->state) {
3069
3070 case SOCKET_START_PRE:
3071 if (f == SOCKET_SUCCESS)
3072 socket_enter_start_chown(s);
3073 else
3074 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3075 break;
3076
3077 case SOCKET_START_CHOWN:
3078 if (f == SOCKET_SUCCESS)
3079 socket_enter_start_post(s);
3080 else
3081 socket_enter_stop_pre(s, f);
3082 break;
3083
3084 case SOCKET_START_POST:
3085 if (f == SOCKET_SUCCESS)
3086 socket_enter_listening(s);
3087 else
3088 socket_enter_stop_pre(s, f);
3089 break;
3090
3091 case SOCKET_STOP_PRE:
3092 case SOCKET_STOP_PRE_SIGTERM:
3093 case SOCKET_STOP_PRE_SIGKILL:
3094 socket_enter_stop_post(s, f);
3095 break;
3096
3097 case SOCKET_STOP_POST:
3098 case SOCKET_FINAL_SIGTERM:
3099 case SOCKET_FINAL_SIGKILL:
3100 socket_enter_dead(s, f);
3101 break;
3102
3103 case SOCKET_CLEANING:
3104
3105 if (s->clean_result == SOCKET_SUCCESS)
3106 s->clean_result = f;
3107
3108 socket_enter_dead(s, SOCKET_SUCCESS);
3109 break;
3110
3111 default:
3112 assert_not_reached("Uh, control process died at wrong time.");
3113 }
3114 }
3115
3116 /* Notify clients about changed exit status */
3117 unit_add_to_dbus_queue(u);
3118 }
3119
3120 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3121 Socket *s = SOCKET(userdata);
3122
3123 assert(s);
3124 assert(s->timer_event_source == source);
3125
3126 switch (s->state) {
3127
3128 case SOCKET_START_PRE:
3129 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3130 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3131 break;
3132
3133 case SOCKET_START_CHOWN:
3134 case SOCKET_START_POST:
3135 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3136 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3137 break;
3138
3139 case SOCKET_STOP_PRE:
3140 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3141 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3142 break;
3143
3144 case SOCKET_STOP_PRE_SIGTERM:
3145 if (s->kill_context.send_sigkill) {
3146 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3147 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3148 } else {
3149 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3150 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3151 }
3152 break;
3153
3154 case SOCKET_STOP_PRE_SIGKILL:
3155 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3156 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3157 break;
3158
3159 case SOCKET_STOP_POST:
3160 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3161 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3162 break;
3163
3164 case SOCKET_FINAL_SIGTERM:
3165 if (s->kill_context.send_sigkill) {
3166 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3167 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3168 } else {
3169 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3170 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3171 }
3172 break;
3173
3174 case SOCKET_FINAL_SIGKILL:
3175 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3176 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3177 break;
3178
3179 case SOCKET_CLEANING:
3180 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3181
3182 if (s->clean_result == SOCKET_SUCCESS)
3183 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3184
3185 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3186 break;
3187
3188 default:
3189 assert_not_reached("Timeout at wrong time.");
3190 }
3191
3192 return 0;
3193 }
3194
3195 int socket_collect_fds(Socket *s, int **fds) {
3196 size_t k = 0, n = 0;
3197 SocketPort *p;
3198 int *rfds;
3199
3200 assert(s);
3201 assert(fds);
3202
3203 /* Called from the service code for requesting our fds */
3204
3205 LIST_FOREACH(port, p, s->ports) {
3206 if (p->fd >= 0)
3207 n++;
3208 n += p->n_auxiliary_fds;
3209 }
3210
3211 if (n <= 0) {
3212 *fds = NULL;
3213 return 0;
3214 }
3215
3216 rfds = new(int, n);
3217 if (!rfds)
3218 return -ENOMEM;
3219
3220 LIST_FOREACH(port, p, s->ports) {
3221 size_t i;
3222
3223 if (p->fd >= 0)
3224 rfds[k++] = p->fd;
3225 for (i = 0; i < p->n_auxiliary_fds; ++i)
3226 rfds[k++] = p->auxiliary_fds[i];
3227 }
3228
3229 assert(k == n);
3230
3231 *fds = rfds;
3232 return (int) n;
3233 }
3234
3235 static void socket_reset_failed(Unit *u) {
3236 Socket *s = SOCKET(u);
3237
3238 assert(s);
3239
3240 if (s->state == SOCKET_FAILED)
3241 socket_set_state(s, SOCKET_DEAD);
3242
3243 s->result = SOCKET_SUCCESS;
3244 s->clean_result = SOCKET_SUCCESS;
3245 }
3246
3247 void socket_connection_unref(Socket *s) {
3248 assert(s);
3249
3250 /* The service is dead. Yay!
3251 *
3252 * This is strictly for one-instance-per-connection
3253 * services. */
3254
3255 assert(s->n_connections > 0);
3256 s->n_connections--;
3257
3258 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3259 }
3260
3261 static void socket_trigger_notify(Unit *u, Unit *other) {
3262 Socket *s = SOCKET(u);
3263
3264 assert(u);
3265 assert(other);
3266
3267 /* Filter out invocations with bogus state */
3268 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3269 assert(other->type == UNIT_SERVICE);
3270
3271 /* Don't propagate state changes from the service if we are already down */
3272 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3273 return;
3274
3275 /* We don't care for the service state if we are in Accept=yes mode */
3276 if (s->accept)
3277 return;
3278
3279 /* Propagate start limit hit state */
3280 if (other->start_limit_hit) {
3281 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3282 return;
3283 }
3284
3285 /* Don't propagate anything if there's still a job queued */
3286 if (other->job)
3287 return;
3288
3289 if (IN_SET(SERVICE(other)->state,
3290 SERVICE_DEAD, SERVICE_FAILED,
3291 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3292 SERVICE_AUTO_RESTART))
3293 socket_enter_listening(s);
3294
3295 if (SERVICE(other)->state == SERVICE_RUNNING)
3296 socket_set_state(s, SOCKET_RUNNING);
3297 }
3298
3299 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3300 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3301 }
3302
3303 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3304 Socket *s = SOCKET(u);
3305 usec_t t;
3306 int r;
3307
3308 if (!s->timer_event_source)
3309 return 0;
3310
3311 r = sd_event_source_get_time(s->timer_event_source, &t);
3312 if (r < 0)
3313 return r;
3314 if (t == USEC_INFINITY)
3315 return 0;
3316
3317 *timeout = t;
3318 return 1;
3319 }
3320
3321 char *socket_fdname(Socket *s) {
3322 assert(s);
3323
3324 /* Returns the name to use for $LISTEN_NAMES. If the user
3325 * didn't specify anything specifically, use the socket unit's
3326 * name as fallback. */
3327
3328 return s->fdname ?: UNIT(s)->id;
3329 }
3330
3331 static int socket_control_pid(Unit *u) {
3332 Socket *s = SOCKET(u);
3333
3334 assert(s);
3335
3336 return s->control_pid;
3337 }
3338
3339 static int socket_clean(Unit *u, ExecCleanMask mask) {
3340 _cleanup_strv_free_ char **l = NULL;
3341 Socket *s = SOCKET(u);
3342 int r;
3343
3344 assert(s);
3345 assert(mask != 0);
3346
3347 if (s->state != SOCKET_DEAD)
3348 return -EBUSY;
3349
3350 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3351 if (r < 0)
3352 return r;
3353
3354 if (strv_isempty(l))
3355 return -EUNATCH;
3356
3357 socket_unwatch_control_pid(s);
3358 s->clean_result = SOCKET_SUCCESS;
3359 s->control_command = NULL;
3360 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3361
3362 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3363 if (r < 0)
3364 goto fail;
3365
3366 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3367 if (r < 0)
3368 goto fail;
3369
3370 socket_set_state(s, SOCKET_CLEANING);
3371
3372 return 0;
3373
3374 fail:
3375 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3376 s->clean_result = SOCKET_FAILURE_RESOURCES;
3377 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
3378 return r;
3379 }
3380
3381 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3382 Socket *s = SOCKET(u);
3383
3384 assert(s);
3385
3386 return exec_context_get_clean_mask(&s->exec_context, ret);
3387 }
3388
3389 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3390 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3391 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3392 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3393 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3394 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3395 };
3396
3397 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3398
3399 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3400 [SOCKET_SUCCESS] = "success",
3401 [SOCKET_FAILURE_RESOURCES] = "resources",
3402 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3403 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3404 [SOCKET_FAILURE_SIGNAL] = "signal",
3405 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3406 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3407 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3408 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3409 };
3410
3411 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3412
3413 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3414 [SOCKET_TIMESTAMPING_OFF] = "off",
3415 [SOCKET_TIMESTAMPING_US] = "us",
3416 [SOCKET_TIMESTAMPING_NS] = "ns",
3417 };
3418
3419 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3420
3421 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3422 SocketTimestamping t;
3423 int r;
3424
3425 if (!p)
3426 return _SOCKET_TIMESTAMPING_INVALID;
3427
3428 t = socket_timestamping_from_string(p);
3429 if (t >= 0)
3430 return t;
3431
3432 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3433 * too. */
3434 if (streq(p, "nsec"))
3435 return SOCKET_TIMESTAMPING_NS;
3436 if (STR_IN_SET(p, "usec", "µs"))
3437 return SOCKET_TIMESTAMPING_US;
3438
3439 r = parse_boolean(p);
3440 if (r < 0)
3441 return _SOCKET_TIMESTAMPING_INVALID;
3442
3443 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3444 }
3445
3446 const UnitVTable socket_vtable = {
3447 .object_size = sizeof(Socket),
3448 .exec_context_offset = offsetof(Socket, exec_context),
3449 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3450 .kill_context_offset = offsetof(Socket, kill_context),
3451 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3452 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3453
3454 .sections =
3455 "Unit\0"
3456 "Socket\0"
3457 "Install\0",
3458 .private_section = "Socket",
3459
3460 .can_transient = true,
3461 .can_trigger = true,
3462 .can_fail = true,
3463
3464 .init = socket_init,
3465 .done = socket_done,
3466 .load = socket_load,
3467
3468 .coldplug = socket_coldplug,
3469
3470 .dump = socket_dump,
3471
3472 .start = socket_start,
3473 .stop = socket_stop,
3474
3475 .kill = socket_kill,
3476 .clean = socket_clean,
3477 .can_clean = socket_can_clean,
3478
3479 .get_timeout = socket_get_timeout,
3480
3481 .serialize = socket_serialize,
3482 .deserialize_item = socket_deserialize_item,
3483 .distribute_fds = socket_distribute_fds,
3484
3485 .active_state = socket_active_state,
3486 .sub_state_to_string = socket_sub_state_to_string,
3487
3488 .will_restart = unit_will_restart_default,
3489
3490 .may_gc = socket_may_gc,
3491
3492 .sigchld_event = socket_sigchld_event,
3493
3494 .trigger_notify = socket_trigger_notify,
3495
3496 .reset_failed = socket_reset_failed,
3497
3498 .control_pid = socket_control_pid,
3499
3500 .bus_set_property = bus_socket_set_property,
3501 .bus_commit_properties = bus_socket_commit_properties,
3502
3503 .status_message_formats = {
3504 /*.starting_stopping = {
3505 [0] = "Starting socket %s...",
3506 [1] = "Stopping socket %s...",
3507 },*/
3508 .finished_start_job = {
3509 [JOB_DONE] = "Listening on %s.",
3510 [JOB_FAILED] = "Failed to listen on %s.",
3511 [JOB_TIMEOUT] = "Timed out starting %s.",
3512 },
3513 .finished_stop_job = {
3514 [JOB_DONE] = "Closed %s.",
3515 [JOB_FAILED] = "Failed stopping %s.",
3516 [JOB_TIMEOUT] = "Timed out stopping %s.",
3517 },
3518 },
3519 };
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