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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 "chase-symlinks.h"
18 #include "copy.h"
19 #include "dbus-socket.h"
20 #include "dbus-unit.h"
21 #include "def.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-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-label.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 "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = UINT_MAX;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid));
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_disable_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 assert(s);
212
213 if (!s->accept)
214 return true;
215
216 LIST_FOREACH(port, p, s->ports) {
217
218 if (p->type != SOCKET_SOCKET)
219 return true;
220
221 if (!socket_address_can_accept(&p->address))
222 return true;
223 }
224
225 return false;
226 }
227
228 static int socket_add_mount_dependencies(Socket *s) {
229 int r;
230
231 assert(s);
232
233 LIST_FOREACH(port, p, s->ports) {
234 const char *path = NULL;
235
236 if (p->type == SOCKET_SOCKET)
237 path = socket_address_get_path(&p->address);
238 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
239 path = p->path;
240
241 if (!path)
242 continue;
243
244 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
245 if (r < 0)
246 return r;
247 }
248
249 return 0;
250 }
251
252 static int socket_add_device_dependencies(Socket *s) {
253 char *t;
254
255 assert(s);
256
257 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
258 return 0;
259
260 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
261 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
262 }
263
264 static int socket_add_default_dependencies(Socket *s) {
265 int r;
266 assert(s);
267
268 if (!UNIT(s)->default_dependencies)
269 return 0;
270
271 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
272 if (r < 0)
273 return r;
274
275 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
276 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279 }
280
281 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 }
283
284 _pure_ static bool socket_has_exec(Socket *s) {
285 unsigned i;
286 assert(s);
287
288 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
289 if (s->exec_command[i])
290 return true;
291
292 return false;
293 }
294
295 static int socket_add_extras(Socket *s) {
296 Unit *u = UNIT(s);
297 int r;
298
299 assert(s);
300
301 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
302 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
303 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
304 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
305 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
306 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
307 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
308 * service starts are typical. */
309
310 if (s->trigger_limit.interval == USEC_INFINITY)
311 s->trigger_limit.interval = 2 * USEC_PER_SEC;
312
313 if (s->trigger_limit.burst == UINT_MAX) {
314 if (s->accept)
315 s->trigger_limit.burst = 200;
316 else
317 s->trigger_limit.burst = 20;
318 }
319
320 if (have_non_accept_socket(s)) {
321
322 if (!UNIT_DEREF(s->service)) {
323 Unit *x;
324
325 r = unit_load_related_unit(u, ".service", &x);
326 if (r < 0)
327 return r;
328
329 unit_ref_set(&s->service, u, x);
330 }
331
332 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
333 if (r < 0)
334 return r;
335 }
336
337 r = socket_add_mount_dependencies(s);
338 if (r < 0)
339 return r;
340
341 r = socket_add_device_dependencies(s);
342 if (r < 0)
343 return r;
344
345 r = unit_patch_contexts(u);
346 if (r < 0)
347 return r;
348
349 if (socket_has_exec(s)) {
350 r = unit_add_exec_dependencies(u, &s->exec_context);
351 if (r < 0)
352 return r;
353 }
354
355 r = unit_set_default_slice(u);
356 if (r < 0)
357 return r;
358
359 r = socket_add_default_dependencies(s);
360 if (r < 0)
361 return r;
362
363 return 0;
364 }
365
366 static const char *socket_find_symlink_target(Socket *s) {
367 const char *found = NULL;
368
369 LIST_FOREACH(port, p, s->ports) {
370 const char *f = NULL;
371
372 switch (p->type) {
373
374 case SOCKET_FIFO:
375 f = p->path;
376 break;
377
378 case SOCKET_SOCKET:
379 f = socket_address_get_path(&p->address);
380 break;
381
382 default:
383 break;
384 }
385
386 if (f) {
387 if (found)
388 return NULL;
389
390 found = f;
391 }
392 }
393
394 return found;
395 }
396
397 static int socket_verify(Socket *s) {
398 assert(s);
399 assert(UNIT(s)->load_state == UNIT_LOADED);
400
401 if (!s->ports)
402 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
403
404 if (s->accept && have_non_accept_socket(s))
405 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
406
407 if (s->accept && s->max_connections <= 0)
408 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
409
410 if (s->accept && UNIT_DEREF(s->service))
411 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
412
413 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
414 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
415
416 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
417 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.");
418
419 return 0;
420 }
421
422 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
423 assert(s);
424
425 if (s->peer.sa.sa_family == AF_INET)
426 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
427 else if (s->peer.sa.sa_family == AF_INET6)
428 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
429 else if (s->peer.sa.sa_family == AF_VSOCK)
430 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
431 else
432 assert_not_reached();
433 }
434
435 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
436 int r;
437
438 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
439 if (r != 0)
440 return r;
441
442 switch(x->peer.sa.sa_family) {
443 case AF_INET:
444 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
445 case AF_INET6:
446 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
447 case AF_VSOCK:
448 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
449 }
450 assert_not_reached();
451 }
452
453 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
454
455 static int socket_load(Unit *u) {
456 Socket *s = SOCKET(u);
457 int r;
458
459 assert(u);
460 assert(u->load_state == UNIT_STUB);
461
462 r = unit_load_fragment_and_dropin(u, true);
463 if (r < 0)
464 return r;
465
466 if (u->load_state != UNIT_LOADED)
467 return 0;
468
469 /* This is a new unit? Then let's add in some extras */
470 r = socket_add_extras(s);
471 if (r < 0)
472 return r;
473
474 return socket_verify(s);
475 }
476
477 static SocketPeer *socket_peer_new(void) {
478 SocketPeer *p;
479
480 p = new(SocketPeer, 1);
481 if (!p)
482 return NULL;
483
484 *p = (SocketPeer) {
485 .n_ref = 1,
486 };
487 return p;
488 }
489
490 static SocketPeer *socket_peer_free(SocketPeer *p) {
491 assert(p);
492
493 if (p->socket)
494 set_remove(p->socket->peers_by_address, p);
495
496 return mfree(p);
497 }
498
499 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
500
501 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
502 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
503 SocketPeer sa = {
504 .peer_salen = sizeof(union sockaddr_union),
505 }, *i;
506 int r;
507
508 assert(fd >= 0);
509 assert(s);
510
511 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
512 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
513
514 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
515 *p = NULL;
516 return 0;
517 }
518
519 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
520 if (r < 0)
521 return r;
522
523 i = set_get(s->peers_by_address, &sa);
524 if (i) {
525 *p = socket_peer_ref(i);
526 return 1;
527 }
528
529 remote = socket_peer_new();
530 if (!remote)
531 return log_oom();
532
533 remote->peer = sa.peer;
534 remote->peer_salen = sa.peer_salen;
535
536 r = set_put(s->peers_by_address, remote);
537 if (r < 0)
538 return r;
539
540 remote->socket = s;
541
542 *p = TAKE_PTR(remote);
543 return 1;
544 }
545
546 _const_ static const char* listen_lookup(int family, int type) {
547
548 if (family == AF_NETLINK)
549 return "ListenNetlink";
550
551 if (type == SOCK_STREAM)
552 return "ListenStream";
553 else if (type == SOCK_DGRAM)
554 return "ListenDatagram";
555 else if (type == SOCK_SEQPACKET)
556 return "ListenSequentialPacket";
557
558 assert_not_reached();
559 return NULL;
560 }
561
562 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
563 Socket *s = SOCKET(u);
564 const char *prefix2, *str;
565
566 assert(s);
567 assert(f);
568
569 prefix = strempty(prefix);
570 prefix2 = strjoina(prefix, "\t");
571
572 fprintf(f,
573 "%sSocket State: %s\n"
574 "%sResult: %s\n"
575 "%sClean Result: %s\n"
576 "%sBindIPv6Only: %s\n"
577 "%sBacklog: %u\n"
578 "%sSocketMode: %04o\n"
579 "%sDirectoryMode: %04o\n"
580 "%sKeepAlive: %s\n"
581 "%sNoDelay: %s\n"
582 "%sFreeBind: %s\n"
583 "%sTransparent: %s\n"
584 "%sBroadcast: %s\n"
585 "%sPassCredentials: %s\n"
586 "%sPassSecurity: %s\n"
587 "%sPassPacketInfo: %s\n"
588 "%sTCPCongestion: %s\n"
589 "%sRemoveOnStop: %s\n"
590 "%sWritable: %s\n"
591 "%sFileDescriptorName: %s\n"
592 "%sSELinuxContextFromNet: %s\n",
593 prefix, socket_state_to_string(s->state),
594 prefix, socket_result_to_string(s->result),
595 prefix, socket_result_to_string(s->clean_result),
596 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
597 prefix, s->backlog,
598 prefix, s->socket_mode,
599 prefix, s->directory_mode,
600 prefix, yes_no(s->keep_alive),
601 prefix, yes_no(s->no_delay),
602 prefix, yes_no(s->free_bind),
603 prefix, yes_no(s->transparent),
604 prefix, yes_no(s->broadcast),
605 prefix, yes_no(s->pass_cred),
606 prefix, yes_no(s->pass_sec),
607 prefix, yes_no(s->pass_pktinfo),
608 prefix, strna(s->tcp_congestion),
609 prefix, yes_no(s->remove_on_stop),
610 prefix, yes_no(s->writable),
611 prefix, socket_fdname(s),
612 prefix, yes_no(s->selinux_context_from_net));
613
614 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
615 fprintf(f,
616 "%sTimestamping: %s\n",
617 prefix, socket_timestamping_to_string(s->timestamping));
618
619 if (s->control_pid > 0)
620 fprintf(f,
621 "%sControl PID: "PID_FMT"\n",
622 prefix, s->control_pid);
623
624 if (s->bind_to_device)
625 fprintf(f,
626 "%sBindToDevice: %s\n",
627 prefix, s->bind_to_device);
628
629 if (s->accept)
630 fprintf(f,
631 "%sAccepted: %u\n"
632 "%sNConnections: %u\n"
633 "%sMaxConnections: %u\n"
634 "%sMaxConnectionsPerSource: %u\n",
635 prefix, s->n_accepted,
636 prefix, s->n_connections,
637 prefix, s->max_connections,
638 prefix, s->max_connections_per_source);
639 else
640 fprintf(f,
641 "%sFlushPending: %s\n",
642 prefix, yes_no(s->flush_pending));
643
644
645 if (s->priority >= 0)
646 fprintf(f,
647 "%sPriority: %i\n",
648 prefix, s->priority);
649
650 if (s->receive_buffer > 0)
651 fprintf(f,
652 "%sReceiveBuffer: %zu\n",
653 prefix, s->receive_buffer);
654
655 if (s->send_buffer > 0)
656 fprintf(f,
657 "%sSendBuffer: %zu\n",
658 prefix, s->send_buffer);
659
660 if (s->ip_tos >= 0)
661 fprintf(f,
662 "%sIPTOS: %i\n",
663 prefix, s->ip_tos);
664
665 if (s->ip_ttl >= 0)
666 fprintf(f,
667 "%sIPTTL: %i\n",
668 prefix, s->ip_ttl);
669
670 if (s->pipe_size > 0)
671 fprintf(f,
672 "%sPipeSize: %zu\n",
673 prefix, s->pipe_size);
674
675 if (s->mark >= 0)
676 fprintf(f,
677 "%sMark: %i\n",
678 prefix, s->mark);
679
680 if (s->mq_maxmsg > 0)
681 fprintf(f,
682 "%sMessageQueueMaxMessages: %li\n",
683 prefix, s->mq_maxmsg);
684
685 if (s->mq_msgsize > 0)
686 fprintf(f,
687 "%sMessageQueueMessageSize: %li\n",
688 prefix, s->mq_msgsize);
689
690 if (s->reuse_port)
691 fprintf(f,
692 "%sReusePort: %s\n",
693 prefix, yes_no(s->reuse_port));
694
695 if (s->smack)
696 fprintf(f,
697 "%sSmackLabel: %s\n",
698 prefix, s->smack);
699
700 if (s->smack_ip_in)
701 fprintf(f,
702 "%sSmackLabelIPIn: %s\n",
703 prefix, s->smack_ip_in);
704
705 if (s->smack_ip_out)
706 fprintf(f,
707 "%sSmackLabelIPOut: %s\n",
708 prefix, s->smack_ip_out);
709
710 if (!isempty(s->user) || !isempty(s->group))
711 fprintf(f,
712 "%sSocketUser: %s\n"
713 "%sSocketGroup: %s\n",
714 prefix, strna(s->user),
715 prefix, strna(s->group));
716
717 if (s->keep_alive_time > 0)
718 fprintf(f,
719 "%sKeepAliveTimeSec: %s\n",
720 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
721
722 if (s->keep_alive_interval > 0)
723 fprintf(f,
724 "%sKeepAliveIntervalSec: %s\n",
725 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
726
727 if (s->keep_alive_cnt > 0)
728 fprintf(f,
729 "%sKeepAliveProbes: %u\n",
730 prefix, s->keep_alive_cnt);
731
732 if (s->defer_accept > 0)
733 fprintf(f,
734 "%sDeferAcceptSec: %s\n",
735 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
736
737 LIST_FOREACH(port, p, s->ports) {
738
739 switch (p->type) {
740 case SOCKET_SOCKET: {
741 _cleanup_free_ char *k = NULL;
742 const char *t;
743 int r;
744
745 r = socket_address_print(&p->address, &k);
746 if (r < 0)
747 t = strerror_safe(r);
748 else
749 t = k;
750
751 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
752 break;
753 }
754 case SOCKET_SPECIAL:
755 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
756 break;
757 case SOCKET_USB_FUNCTION:
758 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
759 break;
760 case SOCKET_MQUEUE:
761 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
762 break;
763 default:
764 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
765 }
766 }
767
768 fprintf(f,
769 "%sTriggerLimitIntervalSec: %s\n"
770 "%sTriggerLimitBurst: %u\n",
771 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
772 prefix, s->trigger_limit.burst);
773
774 str = ip_protocol_to_name(s->socket_protocol);
775 if (str)
776 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
777
778 if (!strv_isempty(s->symlinks)) {
779 char **q;
780
781 fprintf(f, "%sSymlinks:", prefix);
782 STRV_FOREACH(q, s->symlinks)
783 fprintf(f, " %s", *q);
784
785 fprintf(f, "\n");
786 }
787
788 fprintf(f,
789 "%sTimeoutSec: %s\n",
790 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
791
792 exec_context_dump(&s->exec_context, f, prefix);
793 kill_context_dump(&s->kill_context, f, prefix);
794
795 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
796 if (!s->exec_command[c])
797 continue;
798
799 fprintf(f, "%s-> %s:\n",
800 prefix, socket_exec_command_to_string(c));
801
802 exec_command_dump_list(s->exec_command[c], f, prefix2);
803 }
804
805 cgroup_context_dump(UNIT(s), f, prefix);
806 }
807
808 static int instance_from_socket(int fd, unsigned nr, char **instance) {
809 socklen_t l;
810 char *r;
811 union sockaddr_union local, remote;
812
813 assert(fd >= 0);
814 assert(instance);
815
816 l = sizeof(local);
817 if (getsockname(fd, &local.sa, &l) < 0)
818 return -errno;
819
820 l = sizeof(remote);
821 if (getpeername(fd, &remote.sa, &l) < 0)
822 return -errno;
823
824 switch (local.sa.sa_family) {
825
826 case AF_INET: {
827 uint32_t
828 a = be32toh(local.in.sin_addr.s_addr),
829 b = be32toh(remote.in.sin_addr.s_addr);
830
831 if (asprintf(&r,
832 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
833 nr,
834 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
835 be16toh(local.in.sin_port),
836 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
837 be16toh(remote.in.sin_port)) < 0)
838 return -ENOMEM;
839
840 break;
841 }
842
843 case AF_INET6: {
844 static const unsigned char ipv4_prefix[] = {
845 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
846 };
847
848 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
849 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
850 const uint8_t
851 *a = local.in6.sin6_addr.s6_addr+12,
852 *b = remote.in6.sin6_addr.s6_addr+12;
853
854 if (asprintf(&r,
855 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
856 nr,
857 a[0], a[1], a[2], a[3],
858 be16toh(local.in6.sin6_port),
859 b[0], b[1], b[2], b[3],
860 be16toh(remote.in6.sin6_port)) < 0)
861 return -ENOMEM;
862 } else {
863 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
864
865 if (asprintf(&r,
866 "%u-%s:%u-%s:%u",
867 nr,
868 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
869 be16toh(local.in6.sin6_port),
870 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
871 be16toh(remote.in6.sin6_port)) < 0)
872 return -ENOMEM;
873 }
874
875 break;
876 }
877
878 case AF_UNIX: {
879 struct ucred ucred;
880 int k;
881
882 k = getpeercred(fd, &ucred);
883 if (k >= 0) {
884 if (asprintf(&r,
885 "%u-"PID_FMT"-"UID_FMT,
886 nr, ucred.pid, ucred.uid) < 0)
887 return -ENOMEM;
888 } else if (k == -ENODATA) {
889 /* This handles the case where somebody is
890 * connecting from another pid/uid namespace
891 * (e.g. from outside of our container). */
892 if (asprintf(&r,
893 "%u-unknown",
894 nr) < 0)
895 return -ENOMEM;
896 } else
897 return k;
898
899 break;
900 }
901
902 case AF_VSOCK:
903 if (asprintf(&r,
904 "%u-%u:%u-%u:%u",
905 nr,
906 local.vm.svm_cid, local.vm.svm_port,
907 remote.vm.svm_cid, remote.vm.svm_port) < 0)
908 return -ENOMEM;
909
910 break;
911
912 default:
913 assert_not_reached();
914 }
915
916 *instance = r;
917 return 0;
918 }
919
920 static void socket_close_fds(Socket *s) {
921 char **i;
922
923 assert(s);
924
925 LIST_FOREACH(port, p, s->ports) {
926 bool was_open;
927
928 was_open = p->fd >= 0;
929
930 p->event_source = sd_event_source_disable_unref(p->event_source);
931 p->fd = safe_close(p->fd);
932 socket_cleanup_fd_list(p);
933
934 /* One little note: we should normally not delete any sockets in the file system here! After all some
935 * other process we spawned might still have a reference of this fd and wants to continue to use
936 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
937 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
938 * anyway, but only then. */
939
940 if (!was_open || !s->remove_on_stop)
941 continue;
942
943 switch (p->type) {
944
945 case SOCKET_FIFO:
946 (void) unlink(p->path);
947 break;
948
949 case SOCKET_MQUEUE:
950 (void) mq_unlink(p->path);
951 break;
952
953 case SOCKET_SOCKET:
954 (void) socket_address_unlink(&p->address);
955 break;
956
957 default:
958 break;
959 }
960 }
961
962 if (s->remove_on_stop)
963 STRV_FOREACH(i, s->symlinks)
964 (void) unlink(*i);
965
966 /* Note that we don't return NULL here, since s has not been freed. */
967 }
968
969 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
970 int r;
971
972 assert(s);
973 assert(p);
974 assert(fd >= 0);
975
976 if (s->keep_alive) {
977 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
978 if (r < 0)
979 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
980 }
981
982 if (s->keep_alive_time > 0) {
983 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
984 if (r < 0)
985 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
986 }
987
988 if (s->keep_alive_interval > 0) {
989 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
990 if (r < 0)
991 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
992 }
993
994 if (s->keep_alive_cnt > 0) {
995 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
996 if (r < 0)
997 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
998 }
999
1000 if (s->defer_accept > 0) {
1001 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1002 if (r < 0)
1003 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1004 }
1005
1006 if (s->no_delay) {
1007 if (s->socket_protocol == IPPROTO_SCTP) {
1008 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1009 if (r < 0)
1010 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1011 } else {
1012 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1013 if (r < 0)
1014 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1015 }
1016 }
1017
1018 if (s->broadcast) {
1019 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1020 if (r < 0)
1021 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1022 }
1023
1024 if (s->pass_cred) {
1025 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1026 if (r < 0)
1027 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1028 }
1029
1030 if (s->pass_sec) {
1031 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1032 if (r < 0)
1033 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1034 }
1035
1036 if (s->pass_pktinfo) {
1037 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1038 if (r < 0)
1039 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1040 }
1041
1042 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1043 r = setsockopt_int(fd, SOL_SOCKET,
1044 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1045 true);
1046 if (r < 0)
1047 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1048 }
1049
1050 if (s->priority >= 0) {
1051 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1052 if (r < 0)
1053 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1054 }
1055
1056 if (s->receive_buffer > 0) {
1057 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1058 if (r < 0)
1059 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1060 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1061 }
1062
1063 if (s->send_buffer > 0) {
1064 r = fd_set_sndbuf(fd, s->send_buffer, false);
1065 if (r < 0)
1066 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1067 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1068 }
1069
1070 if (s->mark >= 0) {
1071 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1072 if (r < 0)
1073 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1074 }
1075
1076 if (s->ip_tos >= 0) {
1077 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1078 if (r < 0)
1079 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1080 }
1081
1082 if (s->ip_ttl >= 0) {
1083 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1084 if (r < 0)
1085 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1086 }
1087
1088 if (s->tcp_congestion)
1089 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1090 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1091
1092 if (s->smack_ip_in) {
1093 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1094 if (r < 0)
1095 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1096 }
1097
1098 if (s->smack_ip_out) {
1099 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1100 if (r < 0)
1101 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1102 }
1103 }
1104
1105 static void socket_apply_fifo_options(Socket *s, int fd) {
1106 int r;
1107
1108 assert(s);
1109 assert(fd >= 0);
1110
1111 if (s->pipe_size > 0)
1112 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1113 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1114
1115 if (s->smack) {
1116 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1117 if (r < 0)
1118 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1119 }
1120 }
1121
1122 static int fifo_address_create(
1123 const char *path,
1124 mode_t directory_mode,
1125 mode_t socket_mode) {
1126
1127 _cleanup_close_ int fd = -1;
1128 mode_t old_mask;
1129 struct stat st;
1130 int r;
1131
1132 assert(path);
1133
1134 (void) mkdir_parents_label(path, directory_mode);
1135
1136 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1137 if (r < 0)
1138 return r;
1139
1140 /* Enforce the right access mode for the fifo */
1141 old_mask = umask(~socket_mode);
1142
1143 /* Include the original umask in our mask */
1144 (void) umask(~socket_mode | old_mask);
1145
1146 r = mkfifo(path, socket_mode);
1147 (void) umask(old_mask);
1148
1149 if (r < 0 && errno != EEXIST) {
1150 r = -errno;
1151 goto fail;
1152 }
1153
1154 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1155 if (fd < 0) {
1156 r = -errno;
1157 goto fail;
1158 }
1159
1160 mac_selinux_create_file_clear();
1161
1162 if (fstat(fd, &st) < 0) {
1163 r = -errno;
1164 goto fail;
1165 }
1166
1167 if (!S_ISFIFO(st.st_mode) ||
1168 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1169 st.st_uid != getuid() ||
1170 st.st_gid != getgid()) {
1171 r = -EEXIST;
1172 goto fail;
1173 }
1174
1175 return TAKE_FD(fd);
1176
1177 fail:
1178 mac_selinux_create_file_clear();
1179 return r;
1180 }
1181
1182 static int special_address_create(const char *path, bool writable) {
1183 _cleanup_close_ int fd = -1;
1184 struct stat st;
1185
1186 assert(path);
1187
1188 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1189 if (fd < 0)
1190 return -errno;
1191
1192 if (fstat(fd, &st) < 0)
1193 return -errno;
1194
1195 /* Check whether this is a /proc, /sys or /dev file or char device */
1196 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1197 return -EEXIST;
1198
1199 return TAKE_FD(fd);
1200 }
1201
1202 static int usbffs_address_create(const char *path) {
1203 _cleanup_close_ int fd = -1;
1204 struct stat st;
1205
1206 assert(path);
1207
1208 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1209 if (fd < 0)
1210 return -errno;
1211
1212 if (fstat(fd, &st) < 0)
1213 return -errno;
1214
1215 /* Check whether this is a regular file (ffs endpoint) */
1216 if (!S_ISREG(st.st_mode))
1217 return -EEXIST;
1218
1219 return TAKE_FD(fd);
1220 }
1221
1222 static int mq_address_create(
1223 const char *path,
1224 mode_t mq_mode,
1225 long maxmsg,
1226 long msgsize) {
1227
1228 _cleanup_close_ int fd = -1;
1229 struct stat st;
1230 mode_t old_mask;
1231 struct mq_attr _attr, *attr = NULL;
1232
1233 assert(path);
1234
1235 if (maxmsg > 0 && msgsize > 0) {
1236 _attr = (struct mq_attr) {
1237 .mq_flags = O_NONBLOCK,
1238 .mq_maxmsg = maxmsg,
1239 .mq_msgsize = msgsize,
1240 };
1241 attr = &_attr;
1242 }
1243
1244 /* Enforce the right access mode for the mq */
1245 old_mask = umask(~mq_mode);
1246
1247 /* Include the original umask in our mask */
1248 (void) umask(~mq_mode | old_mask);
1249 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1250 (void) umask(old_mask);
1251
1252 if (fd < 0)
1253 return -errno;
1254
1255 if (fstat(fd, &st) < 0)
1256 return -errno;
1257
1258 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1259 st.st_uid != getuid() ||
1260 st.st_gid != getgid())
1261 return -EEXIST;
1262
1263 return TAKE_FD(fd);
1264 }
1265
1266 static int socket_symlink(Socket *s) {
1267 const char *p;
1268 char **i;
1269 int r;
1270
1271 assert(s);
1272
1273 p = socket_find_symlink_target(s);
1274 if (!p)
1275 return 0;
1276
1277 STRV_FOREACH(i, s->symlinks) {
1278 (void) mkdir_parents_label(*i, s->directory_mode);
1279
1280 r = symlink_idempotent(p, *i, false);
1281
1282 if (r == -EEXIST && s->remove_on_stop) {
1283 /* If there's already something where we want to create the symlink, and the destructive
1284 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1285 * again. */
1286
1287 if (unlink(*i) >= 0)
1288 r = symlink_idempotent(p, *i, false);
1289 }
1290
1291 if (r < 0)
1292 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1293 }
1294
1295 return 0;
1296 }
1297
1298 static int usbffs_write_descs(int fd, Service *s) {
1299 int r;
1300
1301 if (!s->usb_function_descriptors || !s->usb_function_strings)
1302 return -EINVAL;
1303
1304 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1305 if (r < 0)
1306 return r;
1307
1308 return copy_file_fd(s->usb_function_strings, fd, 0);
1309 }
1310
1311 static int usbffs_select_ep(const struct dirent *d) {
1312 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1313 }
1314
1315 static int usbffs_dispatch_eps(SocketPort *p) {
1316 _cleanup_free_ struct dirent **ent = NULL;
1317 size_t n, k;
1318 int r;
1319
1320 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1321 if (r < 0)
1322 return -errno;
1323
1324 n = (size_t) r;
1325 p->auxiliary_fds = new(int, n);
1326 if (!p->auxiliary_fds) {
1327 r = -ENOMEM;
1328 goto clear;
1329 }
1330
1331 p->n_auxiliary_fds = n;
1332
1333 k = 0;
1334 for (size_t i = 0; i < n; ++i) {
1335 _cleanup_free_ char *ep = NULL;
1336
1337 ep = path_make_absolute(ent[i]->d_name, p->path);
1338 if (!ep) {
1339 r = -ENOMEM;
1340 goto fail;
1341 }
1342
1343 path_simplify(ep);
1344
1345 r = usbffs_address_create(ep);
1346 if (r < 0)
1347 goto fail;
1348
1349 p->auxiliary_fds[k++] = r;
1350 }
1351
1352 r = 0;
1353 goto clear;
1354
1355 fail:
1356 close_many(p->auxiliary_fds, k);
1357 p->auxiliary_fds = mfree(p->auxiliary_fds);
1358 p->n_auxiliary_fds = 0;
1359
1360 clear:
1361 for (size_t i = 0; i < n; ++i)
1362 free(ent[i]);
1363
1364 return r;
1365 }
1366
1367 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1368 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1369 *
1370 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1371 * instance name.
1372 */
1373
1374 if (UNIT_ISSET(s->service)) {
1375 *ret = UNIT_DEREF(s->service);
1376 return 0;
1377 }
1378
1379 if (!s->accept)
1380 return -ENODATA;
1381
1382 /* Build the instance name and load the unit */
1383 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1384 int r;
1385
1386 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1387 if (r < 0)
1388 return r;
1389
1390 if (cfd >= 0) {
1391 r = instance_from_socket(cfd, s->n_accepted, &instance);
1392 if (ERRNO_IS_DISCONNECT(r))
1393 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1394 * different errors. This connection is over, but the socket unit lives on. */
1395 return log_unit_debug_errno(UNIT(s), r,
1396 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1397 errno_to_name(r));
1398 if (r < 0)
1399 return r;
1400 }
1401
1402 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1403 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1404 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1405 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1406 if (r < 0)
1407 return r;
1408
1409 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1410 }
1411
1412 static int socket_determine_selinux_label(Socket *s, char **ret) {
1413 int r;
1414
1415 assert(s);
1416 assert(ret);
1417
1418 if (s->selinux_context_from_net) {
1419 /* If this is requested, get the label from the network label */
1420
1421 r = mac_selinux_get_our_label(ret);
1422 if (r == -EOPNOTSUPP)
1423 goto no_label;
1424
1425 } else {
1426 /* Otherwise, get it from the executable we are about to start. */
1427
1428 Unit *service;
1429 ExecCommand *c;
1430 _cleanup_free_ char *path = NULL;
1431
1432 r = socket_load_service_unit(s, -1, &service);
1433 if (r == -ENODATA)
1434 goto no_label;
1435 if (r < 0)
1436 return r;
1437
1438 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1439 if (!c)
1440 goto no_label;
1441
1442 r = chase_symlinks(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1443 if (r < 0)
1444 goto no_label;
1445
1446 r = mac_selinux_get_create_label_from_exe(path, ret);
1447 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1448 goto no_label;
1449 }
1450
1451 return r;
1452
1453 no_label:
1454 *ret = NULL;
1455 return 0;
1456 }
1457
1458 static int socket_address_listen_do(
1459 Socket *s,
1460 const SocketAddress *address,
1461 const char *label) {
1462
1463 assert(s);
1464 assert(address);
1465
1466 return socket_address_listen(
1467 address,
1468 SOCK_CLOEXEC|SOCK_NONBLOCK,
1469 s->backlog,
1470 s->bind_ipv6_only,
1471 s->bind_to_device,
1472 s->reuse_port,
1473 s->free_bind,
1474 s->transparent,
1475 s->directory_mode,
1476 s->socket_mode,
1477 label);
1478 }
1479
1480 #define log_address_error_errno(u, address, error, fmt) \
1481 ({ \
1482 _cleanup_free_ char *_t = NULL; \
1483 \
1484 (void) socket_address_print(address, &_t); \
1485 log_unit_error_errno(u, error, fmt, strna(_t)); \
1486 })
1487
1488 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1489 int r;
1490
1491 assert(address);
1492 assert(context);
1493
1494 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1495
1496 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1497 r = bpf_firewall_supported();
1498 if (r < 0)
1499 return r;
1500 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1501 return true;
1502 }
1503
1504 return context->private_network || context->network_namespace_path;
1505 }
1506
1507 static int socket_address_listen_in_cgroup(
1508 Socket *s,
1509 const SocketAddress *address,
1510 const char *label) {
1511
1512 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1513 int fd, r;
1514 pid_t pid;
1515
1516 assert(s);
1517 assert(address);
1518
1519 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1520 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1521 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1522 * such. */
1523
1524 r = fork_needed(address, &s->exec_context);
1525 if (r < 0)
1526 return r;
1527 if (r == 0) {
1528 /* Shortcut things... */
1529 fd = socket_address_listen_do(s, address, label);
1530 if (fd < 0)
1531 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1532
1533 return fd;
1534 }
1535
1536 r = unit_setup_exec_runtime(UNIT(s));
1537 if (r < 0)
1538 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1539
1540 if (s->exec_context.network_namespace_path &&
1541 s->exec_runtime &&
1542 s->exec_runtime->netns_storage_socket[0] >= 0) {
1543 r = open_shareable_ns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1544 if (r < 0)
1545 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1546 }
1547
1548 if (s->exec_context.ipc_namespace_path &&
1549 s->exec_runtime &&
1550 s->exec_runtime->ipcns_storage_socket[0] >= 0) {
1551 r = open_shareable_ns_path(s->exec_runtime->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1552 if (r < 0)
1553 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1554 }
1555
1556 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1557 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1558
1559 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1560 if (r < 0)
1561 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1562 if (r == 0) {
1563 /* Child */
1564
1565 pair[0] = safe_close(pair[0]);
1566
1567 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1568 s->exec_runtime &&
1569 s->exec_runtime->netns_storage_socket[0] >= 0) {
1570
1571 if (ns_type_supported(NAMESPACE_NET)) {
1572 r = setup_shareable_ns(s->exec_runtime->netns_storage_socket, CLONE_NEWNET);
1573 if (r < 0) {
1574 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1575 _exit(EXIT_NETWORK);
1576 }
1577 } else if (s->exec_context.network_namespace_path) {
1578 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1579 _exit(EXIT_NETWORK);
1580 } else
1581 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1582 }
1583
1584 fd = socket_address_listen_do(s, address, label);
1585 if (fd < 0) {
1586 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1587 _exit(EXIT_FAILURE);
1588 }
1589
1590 r = send_one_fd(pair[1], fd, 0);
1591 if (r < 0) {
1592 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1593 _exit(EXIT_FAILURE);
1594 }
1595
1596 _exit(EXIT_SUCCESS);
1597 }
1598
1599 pair[1] = safe_close(pair[1]);
1600 fd = receive_one_fd(pair[0], 0);
1601
1602 /* We synchronously wait for the helper, as it shouldn't be slow */
1603 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1604 if (r < 0) {
1605 safe_close(fd);
1606 return r;
1607 }
1608
1609 if (fd < 0)
1610 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1611
1612 return fd;
1613 }
1614
1615 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1616
1617 static int socket_open_fds(Socket *orig_s) {
1618 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1619 _cleanup_(mac_selinux_freep) char *label = NULL;
1620 bool know_label = false;
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();
1722 }
1723 }
1724
1725 s = NULL;
1726 return 0;
1727 }
1728
1729 static void socket_unwatch_fds(Socket *s) {
1730 int r;
1731
1732 assert(s);
1733
1734 LIST_FOREACH(port, p, s->ports) {
1735 if (p->fd < 0)
1736 continue;
1737
1738 if (!p->event_source)
1739 continue;
1740
1741 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1742 if (r < 0)
1743 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1744 }
1745 }
1746
1747 static int socket_watch_fds(Socket *s) {
1748 int r;
1749
1750 assert(s);
1751
1752 LIST_FOREACH(port, p, s->ports) {
1753 if (p->fd < 0)
1754 continue;
1755
1756 if (p->event_source) {
1757 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1758 if (r < 0)
1759 goto fail;
1760 } else {
1761 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1762 if (r < 0)
1763 goto fail;
1764
1765 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1766 }
1767 }
1768
1769 return 0;
1770
1771 fail:
1772 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1773 socket_unwatch_fds(s);
1774 return r;
1775 }
1776
1777 enum {
1778 SOCKET_OPEN_NONE,
1779 SOCKET_OPEN_SOME,
1780 SOCKET_OPEN_ALL,
1781 };
1782
1783 static int socket_check_open(Socket *s) {
1784 bool have_open = false, have_closed = false;
1785
1786 assert(s);
1787
1788 LIST_FOREACH(port, p, s->ports) {
1789 if (p->fd < 0)
1790 have_closed = true;
1791 else
1792 have_open = true;
1793
1794 if (have_open && have_closed)
1795 return SOCKET_OPEN_SOME;
1796 }
1797
1798 if (have_open)
1799 return SOCKET_OPEN_ALL;
1800
1801 return SOCKET_OPEN_NONE;
1802 }
1803
1804 static void socket_set_state(Socket *s, SocketState state) {
1805 SocketState old_state;
1806 assert(s);
1807
1808 if (s->state != state)
1809 bus_unit_send_pending_change_signal(UNIT(s), false);
1810
1811 old_state = s->state;
1812 s->state = state;
1813
1814 if (!IN_SET(state,
1815 SOCKET_START_PRE,
1816 SOCKET_START_CHOWN,
1817 SOCKET_START_POST,
1818 SOCKET_STOP_PRE,
1819 SOCKET_STOP_PRE_SIGTERM,
1820 SOCKET_STOP_PRE_SIGKILL,
1821 SOCKET_STOP_POST,
1822 SOCKET_FINAL_SIGTERM,
1823 SOCKET_FINAL_SIGKILL,
1824 SOCKET_CLEANING)) {
1825
1826 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1827 socket_unwatch_control_pid(s);
1828 s->control_command = NULL;
1829 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1830 }
1831
1832 if (state != SOCKET_LISTENING)
1833 socket_unwatch_fds(s);
1834
1835 if (!IN_SET(state,
1836 SOCKET_START_CHOWN,
1837 SOCKET_START_POST,
1838 SOCKET_LISTENING,
1839 SOCKET_RUNNING,
1840 SOCKET_STOP_PRE,
1841 SOCKET_STOP_PRE_SIGTERM,
1842 SOCKET_STOP_PRE_SIGKILL,
1843 SOCKET_CLEANING))
1844 socket_close_fds(s);
1845
1846 if (state != old_state)
1847 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1848
1849 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1850 }
1851
1852 static int socket_coldplug(Unit *u) {
1853 Socket *s = SOCKET(u);
1854 int r;
1855
1856 assert(s);
1857 assert(s->state == SOCKET_DEAD);
1858
1859 if (s->deserialized_state == s->state)
1860 return 0;
1861
1862 if (s->control_pid > 0 &&
1863 pid_is_unwaited(s->control_pid) &&
1864 IN_SET(s->deserialized_state,
1865 SOCKET_START_PRE,
1866 SOCKET_START_CHOWN,
1867 SOCKET_START_POST,
1868 SOCKET_STOP_PRE,
1869 SOCKET_STOP_PRE_SIGTERM,
1870 SOCKET_STOP_PRE_SIGKILL,
1871 SOCKET_STOP_POST,
1872 SOCKET_FINAL_SIGTERM,
1873 SOCKET_FINAL_SIGKILL,
1874 SOCKET_CLEANING)) {
1875
1876 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1877 if (r < 0)
1878 return r;
1879
1880 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1881 if (r < 0)
1882 return r;
1883 }
1884
1885 if (IN_SET(s->deserialized_state,
1886 SOCKET_START_CHOWN,
1887 SOCKET_START_POST,
1888 SOCKET_LISTENING,
1889 SOCKET_RUNNING)) {
1890
1891 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1892 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1893 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1894 * and if there's a mismatch, warn loudly. */
1895
1896 r = socket_check_open(s);
1897 if (r == SOCKET_OPEN_NONE)
1898 log_unit_warning(UNIT(s),
1899 "Socket unit configuration has changed while unit has been running, "
1900 "no open socket file descriptor left. "
1901 "The socket unit is not functional until restarted.");
1902 else if (r == SOCKET_OPEN_SOME)
1903 log_unit_warning(UNIT(s),
1904 "Socket unit configuration has changed while unit has been running, "
1905 "and some socket file descriptors have not been opened yet. "
1906 "The socket unit is not fully functional until restarted.");
1907 }
1908
1909 if (s->deserialized_state == SOCKET_LISTENING) {
1910 r = socket_watch_fds(s);
1911 if (r < 0)
1912 return r;
1913 }
1914
1915 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1916 (void) unit_setup_dynamic_creds(u);
1917 (void) unit_setup_exec_runtime(u);
1918 }
1919
1920 socket_set_state(s, s->deserialized_state);
1921 return 0;
1922 }
1923
1924 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1925
1926 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1927 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1928 .stdin_fd = -1,
1929 .stdout_fd = -1,
1930 .stderr_fd = -1,
1931 .exec_fd = -1,
1932 };
1933 pid_t pid;
1934 int r;
1935
1936 assert(s);
1937 assert(c);
1938 assert(_pid);
1939
1940 r = unit_prepare_exec(UNIT(s));
1941 if (r < 0)
1942 return r;
1943
1944 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1945 if (r < 0)
1946 return r;
1947
1948 r = unit_set_exec_params(UNIT(s), &exec_params);
1949 if (r < 0)
1950 return r;
1951
1952 r = exec_spawn(UNIT(s),
1953 c,
1954 &s->exec_context,
1955 &exec_params,
1956 s->exec_runtime,
1957 &s->dynamic_creds,
1958 &pid);
1959 if (r < 0)
1960 return r;
1961
1962 r = unit_watch_pid(UNIT(s), pid, true);
1963 if (r < 0)
1964 return r;
1965
1966 *_pid = pid;
1967
1968 return 0;
1969 }
1970
1971 static int socket_chown(Socket *s, pid_t *_pid) {
1972 pid_t pid;
1973 int r;
1974
1975 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1976 if (r < 0)
1977 goto fail;
1978
1979 /* We have to resolve the user names out-of-process, hence
1980 * let's fork here. It's messy, but well, what can we do? */
1981
1982 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1983 if (r < 0)
1984 return r;
1985 if (r == 0) {
1986 uid_t uid = UID_INVALID;
1987 gid_t gid = GID_INVALID;
1988
1989 /* Child */
1990
1991 if (!isempty(s->user)) {
1992 const char *user = s->user;
1993
1994 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1995 if (r < 0) {
1996 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1997 _exit(EXIT_USER);
1998 }
1999 }
2000
2001 if (!isempty(s->group)) {
2002 const char *group = s->group;
2003
2004 r = get_group_creds(&group, &gid, 0);
2005 if (r < 0) {
2006 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2007 _exit(EXIT_GROUP);
2008 }
2009 }
2010
2011 LIST_FOREACH(port, p, s->ports) {
2012 const char *path = NULL;
2013
2014 if (p->type == SOCKET_SOCKET)
2015 path = socket_address_get_path(&p->address);
2016 else if (p->type == SOCKET_FIFO)
2017 path = p->path;
2018
2019 if (!path)
2020 continue;
2021
2022 if (chown(path, uid, gid) < 0) {
2023 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2024 _exit(EXIT_CHOWN);
2025 }
2026 }
2027
2028 _exit(EXIT_SUCCESS);
2029 }
2030
2031 r = unit_watch_pid(UNIT(s), pid, true);
2032 if (r < 0)
2033 goto fail;
2034
2035 *_pid = pid;
2036 return 0;
2037
2038 fail:
2039 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2040 return r;
2041 }
2042
2043 static void socket_enter_dead(Socket *s, SocketResult f) {
2044 assert(s);
2045
2046 if (s->result == SOCKET_SUCCESS)
2047 s->result = f;
2048
2049 if (s->result == SOCKET_SUCCESS)
2050 unit_log_success(UNIT(s));
2051 else
2052 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2053
2054 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2055
2056 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2057
2058 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2059
2060 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2061
2062 unit_unref_uid_gid(UNIT(s), true);
2063
2064 dynamic_creds_destroy(&s->dynamic_creds);
2065 }
2066
2067 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2068
2069 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2070 int r;
2071 assert(s);
2072
2073 if (s->result == SOCKET_SUCCESS)
2074 s->result = f;
2075
2076 socket_unwatch_control_pid(s);
2077 s->control_command_id = SOCKET_EXEC_STOP_POST;
2078 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2079
2080 if (s->control_command) {
2081 r = socket_spawn(s, s->control_command, &s->control_pid);
2082 if (r < 0)
2083 goto fail;
2084
2085 socket_set_state(s, SOCKET_STOP_POST);
2086 } else
2087 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2088
2089 return;
2090
2091 fail:
2092 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2093 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2094 }
2095
2096 static int state_to_kill_operation(Socket *s, SocketState state) {
2097 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2098 return KILL_RESTART;
2099
2100 if (state == SOCKET_FINAL_SIGTERM)
2101 return KILL_TERMINATE;
2102
2103 return KILL_KILL;
2104 }
2105
2106 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2107 int r;
2108
2109 assert(s);
2110
2111 if (s->result == SOCKET_SUCCESS)
2112 s->result = f;
2113
2114 r = unit_kill_context(
2115 UNIT(s),
2116 &s->kill_context,
2117 state_to_kill_operation(s, state),
2118 -1,
2119 s->control_pid,
2120 false);
2121 if (r < 0)
2122 goto fail;
2123
2124 if (r > 0) {
2125 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2126 if (r < 0)
2127 goto fail;
2128
2129 socket_set_state(s, state);
2130 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2131 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2132 else if (state == SOCKET_STOP_PRE_SIGKILL)
2133 socket_enter_stop_post(s, SOCKET_SUCCESS);
2134 else if (state == SOCKET_FINAL_SIGTERM)
2135 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2136 else
2137 socket_enter_dead(s, SOCKET_SUCCESS);
2138
2139 return;
2140
2141 fail:
2142 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2143
2144 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2145 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2146 else
2147 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2148 }
2149
2150 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2151 int r;
2152 assert(s);
2153
2154 if (s->result == SOCKET_SUCCESS)
2155 s->result = f;
2156
2157 socket_unwatch_control_pid(s);
2158 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2159 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2160
2161 if (s->control_command) {
2162 r = socket_spawn(s, s->control_command, &s->control_pid);
2163 if (r < 0)
2164 goto fail;
2165
2166 socket_set_state(s, SOCKET_STOP_PRE);
2167 } else
2168 socket_enter_stop_post(s, SOCKET_SUCCESS);
2169
2170 return;
2171
2172 fail:
2173 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2174 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2175 }
2176
2177 static void socket_enter_listening(Socket *s) {
2178 int r;
2179 assert(s);
2180
2181 if (!s->accept && s->flush_pending) {
2182 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2183 flush_ports(s);
2184 }
2185
2186 r = socket_watch_fds(s);
2187 if (r < 0) {
2188 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2189 goto fail;
2190 }
2191
2192 socket_set_state(s, SOCKET_LISTENING);
2193 return;
2194
2195 fail:
2196 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2197 }
2198
2199 static void socket_enter_start_post(Socket *s) {
2200 int r;
2201 assert(s);
2202
2203 socket_unwatch_control_pid(s);
2204 s->control_command_id = SOCKET_EXEC_START_POST;
2205 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2206
2207 if (s->control_command) {
2208 r = socket_spawn(s, s->control_command, &s->control_pid);
2209 if (r < 0) {
2210 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2211 goto fail;
2212 }
2213
2214 socket_set_state(s, SOCKET_START_POST);
2215 } else
2216 socket_enter_listening(s);
2217
2218 return;
2219
2220 fail:
2221 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2222 }
2223
2224 static void socket_enter_start_chown(Socket *s) {
2225 int r;
2226
2227 assert(s);
2228
2229 r = socket_open_fds(s);
2230 if (r < 0) {
2231 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2232 goto fail;
2233 }
2234
2235 if (!isempty(s->user) || !isempty(s->group)) {
2236
2237 socket_unwatch_control_pid(s);
2238 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2239 s->control_command = NULL;
2240
2241 r = socket_chown(s, &s->control_pid);
2242 if (r < 0) {
2243 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2244 goto fail;
2245 }
2246
2247 socket_set_state(s, SOCKET_START_CHOWN);
2248 } else
2249 socket_enter_start_post(s);
2250
2251 return;
2252
2253 fail:
2254 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2255 }
2256
2257 static void socket_enter_start_pre(Socket *s) {
2258 int r;
2259 assert(s);
2260
2261 socket_unwatch_control_pid(s);
2262
2263 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2264
2265 s->control_command_id = SOCKET_EXEC_START_PRE;
2266 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2267
2268 if (s->control_command) {
2269 r = socket_spawn(s, s->control_command, &s->control_pid);
2270 if (r < 0) {
2271 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2272 goto fail;
2273 }
2274
2275 socket_set_state(s, SOCKET_START_PRE);
2276 } else
2277 socket_enter_start_chown(s);
2278
2279 return;
2280
2281 fail:
2282 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2283 }
2284
2285 static void flush_ports(Socket *s) {
2286 assert(s);
2287
2288 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2289 * anymore */
2290
2291 LIST_FOREACH(port, p, s->ports) {
2292 if (p->fd < 0)
2293 continue;
2294
2295 (void) flush_accept(p->fd);
2296 (void) flush_fd(p->fd);
2297 }
2298 }
2299
2300 static void socket_enter_running(Socket *s, int cfd_in) {
2301 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2302 * somewhere or close it. */
2303 _cleanup_close_ int cfd = cfd_in;
2304
2305 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2306 int r;
2307
2308 assert(s);
2309
2310 /* We don't take connections anymore if we are supposed to shut down anyway */
2311 if (unit_stop_pending(UNIT(s))) {
2312
2313 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2314
2315 if (cfd >= 0)
2316 goto refuse;
2317
2318 flush_ports(s);
2319 return;
2320 }
2321
2322 if (!ratelimit_below(&s->trigger_limit)) {
2323 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2324 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2325 goto refuse;
2326 }
2327
2328 if (cfd < 0) {
2329 bool pending = false;
2330 Unit *other;
2331
2332 /* If there's already a start pending don't bother to do anything */
2333 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2334 if (unit_active_or_pending(other)) {
2335 pending = true;
2336 break;
2337 }
2338
2339 if (!pending) {
2340 if (!UNIT_ISSET(s->service)) {
2341 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2342 "Service to activate vanished, refusing activation.");
2343 goto fail;
2344 }
2345
2346 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2347 if (r < 0)
2348 goto fail;
2349 }
2350
2351 socket_set_state(s, SOCKET_RUNNING);
2352 } else {
2353 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2354 Unit *service;
2355
2356 if (s->n_connections >= s->max_connections) {
2357 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2358 s->n_connections);
2359 goto refuse;
2360 }
2361
2362 if (s->max_connections_per_source > 0) {
2363 r = socket_acquire_peer(s, cfd, &p);
2364 if (ERRNO_IS_DISCONNECT(r))
2365 return;
2366 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2367 goto fail;
2368 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2369 _cleanup_free_ char *t = NULL;
2370
2371 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2372
2373 log_unit_warning(UNIT(s),
2374 "Too many incoming connections (%u) from source %s, dropping connection.",
2375 p->n_ref, strnull(t));
2376 goto refuse;
2377 }
2378 }
2379
2380 r = socket_load_service_unit(s, cfd, &service);
2381 if (ERRNO_IS_DISCONNECT(r))
2382 return;
2383 if (r < 0)
2384 goto fail;
2385
2386 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2387 false, UNIT_DEPENDENCY_IMPLICIT);
2388 if (r < 0)
2389 goto fail;
2390
2391 s->n_accepted++;
2392
2393 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2394 if (ERRNO_IS_DISCONNECT(r))
2395 return;
2396 if (r < 0)
2397 goto fail;
2398
2399 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2400 s->n_connections++;
2401
2402 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2403 if (r < 0) {
2404 /* We failed to activate the new service, but it still exists. Let's make sure the
2405 * service closes and forgets the connection fd again, immediately. */
2406 service_close_socket_fd(SERVICE(service));
2407 goto fail;
2408 }
2409
2410 /* Notify clients about changed counters */
2411 unit_add_to_dbus_queue(UNIT(s));
2412 }
2413
2414 TAKE_FD(cfd);
2415 return;
2416
2417 refuse:
2418 s->n_refused++;
2419 return;
2420
2421 fail:
2422 if (ERRNO_IS_RESOURCE(r))
2423 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2424 bus_error_message(&error, r));
2425 else
2426 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2427 cfd >= 0 ? "template" : "non-template",
2428 bus_error_message(&error, r));
2429
2430 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2431 }
2432
2433 static void socket_run_next(Socket *s) {
2434 int r;
2435
2436 assert(s);
2437 assert(s->control_command);
2438 assert(s->control_command->command_next);
2439
2440 socket_unwatch_control_pid(s);
2441
2442 s->control_command = s->control_command->command_next;
2443
2444 r = socket_spawn(s, s->control_command, &s->control_pid);
2445 if (r < 0)
2446 goto fail;
2447
2448 return;
2449
2450 fail:
2451 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2452
2453 if (s->state == SOCKET_START_POST)
2454 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2455 else if (s->state == SOCKET_STOP_POST)
2456 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2457 else
2458 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2459 }
2460
2461 static int socket_start(Unit *u) {
2462 Socket *s = SOCKET(u);
2463 int r;
2464
2465 assert(s);
2466
2467 /* We cannot fulfill this request right now, try again later
2468 * please! */
2469 if (IN_SET(s->state,
2470 SOCKET_STOP_PRE,
2471 SOCKET_STOP_PRE_SIGKILL,
2472 SOCKET_STOP_PRE_SIGTERM,
2473 SOCKET_STOP_POST,
2474 SOCKET_FINAL_SIGTERM,
2475 SOCKET_FINAL_SIGKILL,
2476 SOCKET_CLEANING))
2477 return -EAGAIN;
2478
2479 /* Already on it! */
2480 if (IN_SET(s->state,
2481 SOCKET_START_PRE,
2482 SOCKET_START_CHOWN,
2483 SOCKET_START_POST))
2484 return 0;
2485
2486 /* Cannot run this without the service being around */
2487 if (UNIT_ISSET(s->service)) {
2488 Service *service;
2489
2490 service = SERVICE(UNIT_DEREF(s->service));
2491
2492 if (UNIT(service)->load_state != UNIT_LOADED)
2493 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2494
2495 /* If the service is already active we cannot start the
2496 * socket */
2497 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
2498 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2499 }
2500
2501 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2502
2503 r = unit_acquire_invocation_id(u);
2504 if (r < 0)
2505 return r;
2506
2507 s->result = SOCKET_SUCCESS;
2508 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2509
2510 u->reset_accounting = true;
2511
2512 socket_enter_start_pre(s);
2513 return 1;
2514 }
2515
2516 static int socket_stop(Unit *u) {
2517 Socket *s = SOCKET(u);
2518
2519 assert(s);
2520
2521 /* Already on it */
2522 if (IN_SET(s->state,
2523 SOCKET_STOP_PRE,
2524 SOCKET_STOP_PRE_SIGTERM,
2525 SOCKET_STOP_PRE_SIGKILL,
2526 SOCKET_STOP_POST,
2527 SOCKET_FINAL_SIGTERM,
2528 SOCKET_FINAL_SIGKILL))
2529 return 0;
2530
2531 /* If there's already something running we go directly into
2532 * kill mode. */
2533 if (IN_SET(s->state,
2534 SOCKET_START_PRE,
2535 SOCKET_START_CHOWN,
2536 SOCKET_START_POST)) {
2537 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2538 return -EAGAIN;
2539 }
2540
2541 /* If we are currently cleaning, then abort it, brutally. */
2542 if (s->state == SOCKET_CLEANING) {
2543 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2544 return 0;
2545 }
2546
2547 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2548
2549 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2550 return 1;
2551 }
2552
2553 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2554 Socket *s = SOCKET(u);
2555 int r;
2556
2557 assert(u);
2558 assert(f);
2559 assert(fds);
2560
2561 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2562 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2563 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2564 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2565
2566 if (s->control_pid > 0)
2567 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2568
2569 if (s->control_command_id >= 0)
2570 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2571
2572 LIST_FOREACH(port, p, s->ports) {
2573 int copy;
2574
2575 if (p->fd < 0)
2576 continue;
2577
2578 copy = fdset_put_dup(fds, p->fd);
2579 if (copy < 0)
2580 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2581
2582 if (p->type == SOCKET_SOCKET) {
2583 _cleanup_free_ char *t = NULL;
2584
2585 r = socket_address_print(&p->address, &t);
2586 if (r < 0)
2587 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2588
2589 if (socket_address_family(&p->address) == AF_NETLINK)
2590 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2591 else
2592 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2593 } else if (p->type == SOCKET_SPECIAL)
2594 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2595 else if (p->type == SOCKET_MQUEUE)
2596 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2597 else if (p->type == SOCKET_USB_FUNCTION)
2598 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2599 else {
2600 assert(p->type == SOCKET_FIFO);
2601 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2602 }
2603 }
2604
2605 return 0;
2606 }
2607
2608 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2609 Socket *s = SOCKET(u);
2610
2611 assert(u);
2612 assert(key);
2613 assert(value);
2614
2615 if (streq(key, "state")) {
2616 SocketState state;
2617
2618 state = socket_state_from_string(value);
2619 if (state < 0)
2620 log_unit_debug(u, "Failed to parse state value: %s", value);
2621 else
2622 s->deserialized_state = state;
2623 } else if (streq(key, "result")) {
2624 SocketResult f;
2625
2626 f = socket_result_from_string(value);
2627 if (f < 0)
2628 log_unit_debug(u, "Failed to parse result value: %s", value);
2629 else if (f != SOCKET_SUCCESS)
2630 s->result = f;
2631
2632 } else if (streq(key, "n-accepted")) {
2633 unsigned k;
2634
2635 if (safe_atou(value, &k) < 0)
2636 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2637 else
2638 s->n_accepted += k;
2639 } else if (streq(key, "n-refused")) {
2640 unsigned k;
2641
2642 if (safe_atou(value, &k) < 0)
2643 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2644 else
2645 s->n_refused += k;
2646 } else if (streq(key, "control-pid")) {
2647 pid_t pid;
2648
2649 if (parse_pid(value, &pid) < 0)
2650 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2651 else
2652 s->control_pid = pid;
2653 } else if (streq(key, "control-command")) {
2654 SocketExecCommand id;
2655
2656 id = socket_exec_command_from_string(value);
2657 if (id < 0)
2658 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2659 else {
2660 s->control_command_id = id;
2661 s->control_command = s->exec_command[id];
2662 }
2663 } else if (streq(key, "fifo")) {
2664 int fd, skip = 0;
2665
2666 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2667 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2668 else {
2669 bool found = false;
2670
2671 LIST_FOREACH(port, p, s->ports)
2672 if (p->fd < 0 &&
2673 p->type == SOCKET_FIFO &&
2674 path_equal_or_files_same(p->path, value+skip, 0)) {
2675 p->fd = fdset_remove(fds, fd);
2676 found = true;
2677 break;
2678 }
2679 if (!found)
2680 log_unit_debug(u, "No matching fifo socket found: %s", value+skip);
2681 }
2682
2683 } else if (streq(key, "special")) {
2684 int fd, skip = 0;
2685
2686 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2687 log_unit_debug(u, "Failed to parse special value: %s", value);
2688 else {
2689 bool found = false;
2690
2691 LIST_FOREACH(port, p, s->ports)
2692 if (p->fd < 0 &&
2693 p->type == SOCKET_SPECIAL &&
2694 path_equal_or_files_same(p->path, value+skip, 0)) {
2695 p->fd = fdset_remove(fds, fd);
2696 found = true;
2697 break;
2698 }
2699 if (!found)
2700 log_unit_debug(u, "No matching special socket found: %s", value+skip);
2701 }
2702
2703 } else if (streq(key, "mqueue")) {
2704 int fd, skip = 0;
2705
2706 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2707 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2708 else {
2709 bool found = false;
2710
2711 LIST_FOREACH(port, p, s->ports)
2712 if (p->fd < 0 &&
2713 p->type == SOCKET_MQUEUE &&
2714 streq(p->path, value+skip)) {
2715 p->fd = fdset_remove(fds, fd);
2716 found = true;
2717 break;
2718 }
2719 if (!found)
2720 log_unit_debug(u, "No matching mqueue socket found: %s", value+skip);
2721 }
2722
2723 } else if (streq(key, "socket")) {
2724 int fd, type, skip = 0;
2725
2726 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2727 log_unit_debug(u, "Failed to parse socket value: %s", value);
2728 else {
2729 bool found = false;
2730
2731 LIST_FOREACH(port, p, s->ports)
2732 if (p->fd < 0 &&
2733 socket_address_is(&p->address, value+skip, type)) {
2734 p->fd = fdset_remove(fds, fd);
2735 found = true;
2736 break;
2737 }
2738 if (!found)
2739 log_unit_debug(u, "No matching %s socket found: %s",
2740 socket_address_type_to_string(type), value+skip);
2741 }
2742
2743 } else if (streq(key, "netlink")) {
2744 int fd, skip = 0;
2745
2746 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2747 log_unit_debug(u, "Failed to parse socket value: %s", value);
2748 else {
2749 bool found = false;
2750
2751 LIST_FOREACH(port, p, s->ports)
2752 if (p->fd < 0 &&
2753 socket_address_is_netlink(&p->address, value+skip)) {
2754 p->fd = fdset_remove(fds, fd);
2755 found = true;
2756 break;
2757 }
2758 if (!found)
2759 log_unit_debug(u, "No matching netlink socket found: %s", value+skip);
2760 }
2761
2762 } else if (streq(key, "ffs")) {
2763 int fd, skip = 0;
2764
2765 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2766 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2767 else {
2768 bool found = false;
2769
2770 LIST_FOREACH(port, p, s->ports)
2771 if (p->fd < 0 &&
2772 p->type == SOCKET_USB_FUNCTION &&
2773 path_equal_or_files_same(p->path, value+skip, 0)) {
2774 p->fd = fdset_remove(fds, fd);
2775 found = true;
2776 break;
2777 }
2778 if (!found)
2779 log_unit_debug(u, "No matching ffs socket found: %s", value+skip);
2780 }
2781
2782 } else
2783 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2784
2785 return 0;
2786 }
2787
2788 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2789 Socket *s = SOCKET(u);
2790
2791 assert(u);
2792
2793 LIST_FOREACH(port, p, s->ports) {
2794 int fd;
2795
2796 if (p->type != SOCKET_SOCKET)
2797 continue;
2798
2799 if (p->fd >= 0)
2800 continue;
2801
2802 FDSET_FOREACH(fd, fds) {
2803 if (socket_address_matches_fd(&p->address, fd)) {
2804 p->fd = fdset_remove(fds, fd);
2805 s->deserialized_state = SOCKET_LISTENING;
2806 break;
2807 }
2808 }
2809 }
2810 }
2811
2812 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2813 assert(u);
2814
2815 return state_translation_table[SOCKET(u)->state];
2816 }
2817
2818 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2819 assert(u);
2820
2821 return socket_state_to_string(SOCKET(u)->state);
2822 }
2823
2824 const char* socket_port_type_to_string(SocketPort *p) {
2825
2826 assert(p);
2827
2828 switch (p->type) {
2829
2830 case SOCKET_SOCKET:
2831
2832 switch (p->address.type) {
2833
2834 case SOCK_STREAM:
2835 return "Stream";
2836
2837 case SOCK_DGRAM:
2838 return "Datagram";
2839
2840 case SOCK_SEQPACKET:
2841 return "SequentialPacket";
2842
2843 case SOCK_RAW:
2844 if (socket_address_family(&p->address) == AF_NETLINK)
2845 return "Netlink";
2846
2847 _fallthrough_;
2848 default:
2849 return NULL;
2850 }
2851
2852 case SOCKET_SPECIAL:
2853 return "Special";
2854
2855 case SOCKET_MQUEUE:
2856 return "MessageQueue";
2857
2858 case SOCKET_FIFO:
2859 return "FIFO";
2860
2861 case SOCKET_USB_FUNCTION:
2862 return "USBFunction";
2863
2864 default:
2865 return NULL;
2866 }
2867 }
2868
2869 SocketType socket_port_type_from_string(const char *s) {
2870 assert(s);
2871
2872 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2873 return SOCKET_SOCKET;
2874 else if (streq(s, "Special"))
2875 return SOCKET_SPECIAL;
2876 else if (streq(s, "MessageQueue"))
2877 return SOCKET_MQUEUE;
2878 else if (streq(s, "FIFO"))
2879 return SOCKET_FIFO;
2880 else if (streq(s, "USBFunction"))
2881 return SOCKET_USB_FUNCTION;
2882 else
2883 return _SOCKET_TYPE_INVALID;
2884 }
2885
2886 _pure_ static bool socket_may_gc(Unit *u) {
2887 Socket *s = SOCKET(u);
2888
2889 assert(u);
2890
2891 return s->n_connections == 0;
2892 }
2893
2894 static int socket_accept_do(Socket *s, int fd) {
2895 int cfd;
2896
2897 assert(s);
2898 assert(fd >= 0);
2899
2900 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2901 if (cfd < 0)
2902 /* Convert transient network errors into clean and well-defined EAGAIN */
2903 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2904
2905 return cfd;
2906 }
2907
2908 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2909 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2910 int cfd, r;
2911 pid_t pid;
2912
2913 assert(s);
2914 assert(p);
2915 assert(fd >= 0);
2916
2917 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2918 * connection socket is also properly associated with the cgroup. */
2919
2920 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2921 goto shortcut;
2922
2923 r = bpf_firewall_supported();
2924 if (r < 0)
2925 return r;
2926 if (r == BPF_FIREWALL_UNSUPPORTED)
2927 goto shortcut;
2928
2929 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2930 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2931
2932 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2933 if (r < 0)
2934 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2935 if (r == 0) {
2936 /* Child */
2937
2938 pair[0] = safe_close(pair[0]);
2939
2940 cfd = socket_accept_do(s, fd);
2941 if (cfd == -EAGAIN) /* spurious accept() */
2942 _exit(EXIT_SUCCESS);
2943 if (cfd < 0) {
2944 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2945 _exit(EXIT_FAILURE);
2946 }
2947
2948 r = send_one_fd(pair[1], cfd, 0);
2949 if (r < 0) {
2950 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2951 _exit(EXIT_FAILURE);
2952 }
2953
2954 _exit(EXIT_SUCCESS);
2955 }
2956
2957 pair[1] = safe_close(pair[1]);
2958 cfd = receive_one_fd(pair[0], 0);
2959
2960 /* We synchronously wait for the helper, as it shouldn't be slow */
2961 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2962 if (r < 0) {
2963 safe_close(cfd);
2964 return r;
2965 }
2966
2967 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2968 * this is a spurious accept(), let's convert that back to EAGAIN here. */
2969 if (cfd == -EIO)
2970 return -EAGAIN;
2971 if (cfd < 0)
2972 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2973
2974 return cfd;
2975
2976 shortcut:
2977 cfd = socket_accept_do(s, fd);
2978 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
2979 return -EAGAIN;
2980 if (cfd < 0)
2981 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2982
2983 return cfd;
2984 }
2985
2986 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2987 SocketPort *p = userdata;
2988 int cfd = -1;
2989
2990 assert(p);
2991 assert(fd >= 0);
2992
2993 if (p->socket->state != SOCKET_LISTENING)
2994 return 0;
2995
2996 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2997
2998 if (revents != EPOLLIN) {
2999 if (revents & EPOLLHUP)
3000 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.");
3001 else
3002 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3003 goto fail;
3004 }
3005
3006 if (p->socket->accept &&
3007 p->type == SOCKET_SOCKET &&
3008 socket_address_can_accept(&p->address)) {
3009
3010 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3011 if (cfd == -EAGAIN) /* Spurious accept() */
3012 return 0;
3013 if (cfd < 0)
3014 goto fail;
3015
3016 socket_apply_socket_options(p->socket, p, cfd);
3017 }
3018
3019 socket_enter_running(p->socket, cfd);
3020 return 0;
3021
3022 fail:
3023 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3024 return 0;
3025 }
3026
3027 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3028 Socket *s = SOCKET(u);
3029 SocketResult f;
3030
3031 assert(s);
3032 assert(pid >= 0);
3033
3034 if (pid != s->control_pid)
3035 return;
3036
3037 s->control_pid = 0;
3038
3039 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3040 f = SOCKET_SUCCESS;
3041 else if (code == CLD_EXITED)
3042 f = SOCKET_FAILURE_EXIT_CODE;
3043 else if (code == CLD_KILLED)
3044 f = SOCKET_FAILURE_SIGNAL;
3045 else if (code == CLD_DUMPED)
3046 f = SOCKET_FAILURE_CORE_DUMP;
3047 else
3048 assert_not_reached();
3049
3050 if (s->control_command) {
3051 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3052
3053 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3054 f = SOCKET_SUCCESS;
3055 }
3056
3057 unit_log_process_exit(
3058 u,
3059 "Control process",
3060 socket_exec_command_to_string(s->control_command_id),
3061 f == SOCKET_SUCCESS,
3062 code, status);
3063
3064 if (s->result == SOCKET_SUCCESS)
3065 s->result = f;
3066
3067 if (s->control_command &&
3068 s->control_command->command_next &&
3069 f == SOCKET_SUCCESS) {
3070
3071 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3072 socket_run_next(s);
3073 } else {
3074 s->control_command = NULL;
3075 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3076
3077 /* No further commands for this step, so let's figure
3078 * out what to do next */
3079
3080 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3081
3082 switch (s->state) {
3083
3084 case SOCKET_START_PRE:
3085 if (f == SOCKET_SUCCESS)
3086 socket_enter_start_chown(s);
3087 else
3088 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3089 break;
3090
3091 case SOCKET_START_CHOWN:
3092 if (f == SOCKET_SUCCESS)
3093 socket_enter_start_post(s);
3094 else
3095 socket_enter_stop_pre(s, f);
3096 break;
3097
3098 case SOCKET_START_POST:
3099 if (f == SOCKET_SUCCESS)
3100 socket_enter_listening(s);
3101 else
3102 socket_enter_stop_pre(s, f);
3103 break;
3104
3105 case SOCKET_STOP_PRE:
3106 case SOCKET_STOP_PRE_SIGTERM:
3107 case SOCKET_STOP_PRE_SIGKILL:
3108 socket_enter_stop_post(s, f);
3109 break;
3110
3111 case SOCKET_STOP_POST:
3112 case SOCKET_FINAL_SIGTERM:
3113 case SOCKET_FINAL_SIGKILL:
3114 socket_enter_dead(s, f);
3115 break;
3116
3117 case SOCKET_CLEANING:
3118
3119 if (s->clean_result == SOCKET_SUCCESS)
3120 s->clean_result = f;
3121
3122 socket_enter_dead(s, SOCKET_SUCCESS);
3123 break;
3124
3125 default:
3126 assert_not_reached();
3127 }
3128 }
3129
3130 /* Notify clients about changed exit status */
3131 unit_add_to_dbus_queue(u);
3132 }
3133
3134 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3135 Socket *s = SOCKET(userdata);
3136
3137 assert(s);
3138 assert(s->timer_event_source == source);
3139
3140 switch (s->state) {
3141
3142 case SOCKET_START_PRE:
3143 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3144 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3145 break;
3146
3147 case SOCKET_START_CHOWN:
3148 case SOCKET_START_POST:
3149 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3150 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3151 break;
3152
3153 case SOCKET_STOP_PRE:
3154 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3155 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3156 break;
3157
3158 case SOCKET_STOP_PRE_SIGTERM:
3159 if (s->kill_context.send_sigkill) {
3160 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3161 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3162 } else {
3163 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3164 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3165 }
3166 break;
3167
3168 case SOCKET_STOP_PRE_SIGKILL:
3169 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3170 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3171 break;
3172
3173 case SOCKET_STOP_POST:
3174 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3175 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3176 break;
3177
3178 case SOCKET_FINAL_SIGTERM:
3179 if (s->kill_context.send_sigkill) {
3180 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3181 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3182 } else {
3183 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3184 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3185 }
3186 break;
3187
3188 case SOCKET_FINAL_SIGKILL:
3189 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3190 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3191 break;
3192
3193 case SOCKET_CLEANING:
3194 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3195
3196 if (s->clean_result == SOCKET_SUCCESS)
3197 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3198
3199 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3200 break;
3201
3202 default:
3203 assert_not_reached();
3204 }
3205
3206 return 0;
3207 }
3208
3209 int socket_collect_fds(Socket *s, int **fds) {
3210 size_t k = 0, n = 0;
3211 int *rfds;
3212
3213 assert(s);
3214 assert(fds);
3215
3216 /* Called from the service code for requesting our fds */
3217
3218 LIST_FOREACH(port, p, s->ports) {
3219 if (p->fd >= 0)
3220 n++;
3221 n += p->n_auxiliary_fds;
3222 }
3223
3224 if (n <= 0) {
3225 *fds = NULL;
3226 return 0;
3227 }
3228
3229 rfds = new(int, n);
3230 if (!rfds)
3231 return -ENOMEM;
3232
3233 LIST_FOREACH(port, p, s->ports) {
3234 if (p->fd >= 0)
3235 rfds[k++] = p->fd;
3236 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3237 rfds[k++] = p->auxiliary_fds[i];
3238 }
3239
3240 assert(k == n);
3241
3242 *fds = rfds;
3243 return (int) n;
3244 }
3245
3246 static void socket_reset_failed(Unit *u) {
3247 Socket *s = SOCKET(u);
3248
3249 assert(s);
3250
3251 if (s->state == SOCKET_FAILED)
3252 socket_set_state(s, SOCKET_DEAD);
3253
3254 s->result = SOCKET_SUCCESS;
3255 s->clean_result = SOCKET_SUCCESS;
3256 }
3257
3258 void socket_connection_unref(Socket *s) {
3259 assert(s);
3260
3261 /* The service is dead. Yay!
3262 *
3263 * This is strictly for one-instance-per-connection
3264 * services. */
3265
3266 assert(s->n_connections > 0);
3267 s->n_connections--;
3268
3269 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3270 }
3271
3272 static void socket_trigger_notify(Unit *u, Unit *other) {
3273 Socket *s = SOCKET(u);
3274
3275 assert(u);
3276 assert(other);
3277
3278 /* Filter out invocations with bogus state */
3279 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3280 assert(other->type == UNIT_SERVICE);
3281
3282 /* Don't propagate state changes from the service if we are already down */
3283 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3284 return;
3285
3286 /* We don't care for the service state if we are in Accept=yes mode */
3287 if (s->accept)
3288 return;
3289
3290 /* Propagate start limit hit state */
3291 if (other->start_limit_hit) {
3292 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3293 return;
3294 }
3295
3296 /* Don't propagate anything if there's still a job queued */
3297 if (other->job)
3298 return;
3299
3300 if (IN_SET(SERVICE(other)->state,
3301 SERVICE_DEAD, SERVICE_FAILED,
3302 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3303 SERVICE_AUTO_RESTART))
3304 socket_enter_listening(s);
3305
3306 if (SERVICE(other)->state == SERVICE_RUNNING)
3307 socket_set_state(s, SOCKET_RUNNING);
3308 }
3309
3310 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3311 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3312 }
3313
3314 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3315 Socket *s = SOCKET(u);
3316 usec_t t;
3317 int r;
3318
3319 if (!s->timer_event_source)
3320 return 0;
3321
3322 r = sd_event_source_get_time(s->timer_event_source, &t);
3323 if (r < 0)
3324 return r;
3325 if (t == USEC_INFINITY)
3326 return 0;
3327
3328 *timeout = t;
3329 return 1;
3330 }
3331
3332 char *socket_fdname(Socket *s) {
3333 assert(s);
3334
3335 /* Returns the name to use for $LISTEN_NAMES. If the user
3336 * didn't specify anything specifically, use the socket unit's
3337 * name as fallback. */
3338
3339 return s->fdname ?: UNIT(s)->id;
3340 }
3341
3342 static int socket_control_pid(Unit *u) {
3343 Socket *s = SOCKET(u);
3344
3345 assert(s);
3346
3347 return s->control_pid;
3348 }
3349
3350 static int socket_clean(Unit *u, ExecCleanMask mask) {
3351 _cleanup_strv_free_ char **l = NULL;
3352 Socket *s = SOCKET(u);
3353 int r;
3354
3355 assert(s);
3356 assert(mask != 0);
3357
3358 if (s->state != SOCKET_DEAD)
3359 return -EBUSY;
3360
3361 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3362 if (r < 0)
3363 return r;
3364
3365 if (strv_isempty(l))
3366 return -EUNATCH;
3367
3368 socket_unwatch_control_pid(s);
3369 s->clean_result = SOCKET_SUCCESS;
3370 s->control_command = NULL;
3371 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3372
3373 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3374 if (r < 0)
3375 goto fail;
3376
3377 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3378 if (r < 0)
3379 goto fail;
3380
3381 socket_set_state(s, SOCKET_CLEANING);
3382
3383 return 0;
3384
3385 fail:
3386 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3387 s->clean_result = SOCKET_FAILURE_RESOURCES;
3388 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3389 return r;
3390 }
3391
3392 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3393 Socket *s = SOCKET(u);
3394
3395 assert(s);
3396
3397 return exec_context_get_clean_mask(&s->exec_context, ret);
3398 }
3399
3400 static int socket_can_start(Unit *u) {
3401 Socket *s = SOCKET(u);
3402 int r;
3403
3404 assert(s);
3405
3406 r = unit_test_start_limit(u);
3407 if (r < 0) {
3408 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3409 return r;
3410 }
3411
3412 return 1;
3413 }
3414
3415 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3416 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3417 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3418 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3419 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3420 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3421 };
3422
3423 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3424
3425 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3426 [SOCKET_SUCCESS] = "success",
3427 [SOCKET_FAILURE_RESOURCES] = "resources",
3428 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3429 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3430 [SOCKET_FAILURE_SIGNAL] = "signal",
3431 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3432 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3433 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3434 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3435 };
3436
3437 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3438
3439 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3440 [SOCKET_TIMESTAMPING_OFF] = "off",
3441 [SOCKET_TIMESTAMPING_US] = "us",
3442 [SOCKET_TIMESTAMPING_NS] = "ns",
3443 };
3444
3445 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3446
3447 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3448 SocketTimestamping t;
3449 int r;
3450
3451 if (!p)
3452 return _SOCKET_TIMESTAMPING_INVALID;
3453
3454 t = socket_timestamping_from_string(p);
3455 if (t >= 0)
3456 return t;
3457
3458 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3459 * too. */
3460 if (streq(p, "nsec"))
3461 return SOCKET_TIMESTAMPING_NS;
3462 if (STR_IN_SET(p, "usec", "µs"))
3463 return SOCKET_TIMESTAMPING_US;
3464
3465 r = parse_boolean(p);
3466 if (r < 0)
3467 return _SOCKET_TIMESTAMPING_INVALID;
3468
3469 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3470 }
3471
3472 const UnitVTable socket_vtable = {
3473 .object_size = sizeof(Socket),
3474 .exec_context_offset = offsetof(Socket, exec_context),
3475 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3476 .kill_context_offset = offsetof(Socket, kill_context),
3477 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3478 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3479
3480 .sections =
3481 "Unit\0"
3482 "Socket\0"
3483 "Install\0",
3484 .private_section = "Socket",
3485
3486 .can_transient = true,
3487 .can_trigger = true,
3488 .can_fail = true,
3489
3490 .init = socket_init,
3491 .done = socket_done,
3492 .load = socket_load,
3493
3494 .coldplug = socket_coldplug,
3495
3496 .dump = socket_dump,
3497
3498 .start = socket_start,
3499 .stop = socket_stop,
3500
3501 .kill = socket_kill,
3502 .clean = socket_clean,
3503 .can_clean = socket_can_clean,
3504
3505 .get_timeout = socket_get_timeout,
3506
3507 .serialize = socket_serialize,
3508 .deserialize_item = socket_deserialize_item,
3509 .distribute_fds = socket_distribute_fds,
3510
3511 .active_state = socket_active_state,
3512 .sub_state_to_string = socket_sub_state_to_string,
3513
3514 .will_restart = unit_will_restart_default,
3515
3516 .may_gc = socket_may_gc,
3517
3518 .sigchld_event = socket_sigchld_event,
3519
3520 .trigger_notify = socket_trigger_notify,
3521
3522 .reset_failed = socket_reset_failed,
3523
3524 .control_pid = socket_control_pid,
3525
3526 .bus_set_property = bus_socket_set_property,
3527 .bus_commit_properties = bus_socket_commit_properties,
3528
3529 .status_message_formats = {
3530 .finished_start_job = {
3531 [JOB_DONE] = "Listening on %s.",
3532 [JOB_FAILED] = "Failed to listen on %s.",
3533 [JOB_TIMEOUT] = "Timed out starting %s.",
3534 },
3535 .finished_stop_job = {
3536 [JOB_DONE] = "Closed %s.",
3537 [JOB_FAILED] = "Failed stopping %s.",
3538 [JOB_TIMEOUT] = "Timed out stopping %s.",
3539 },
3540 },
3541
3542 .can_start = socket_can_start,
3543 };
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