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manager: use target process context to set socket context
[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 int r;
743
744 r = socket_address_print(&p->address, &k);
745 if (r < 0) {
746 errno = -r;
747 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
748 } else
749 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
750 break;
751 }
752 case SOCKET_SPECIAL:
753 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
754 break;
755 case SOCKET_USB_FUNCTION:
756 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
757 break;
758 case SOCKET_MQUEUE:
759 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
760 break;
761 default:
762 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
763 }
764 }
765
766 fprintf(f,
767 "%sTriggerLimitIntervalSec: %s\n"
768 "%sTriggerLimitBurst: %u\n",
769 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
770 prefix, s->trigger_limit.burst);
771
772 str = ip_protocol_to_name(s->socket_protocol);
773 if (str)
774 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
775
776 if (!strv_isempty(s->symlinks)) {
777 fprintf(f, "%sSymlinks:", prefix);
778 STRV_FOREACH(q, s->symlinks)
779 fprintf(f, " %s", *q);
780
781 fprintf(f, "\n");
782 }
783
784 fprintf(f,
785 "%sTimeoutSec: %s\n",
786 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
787
788 exec_context_dump(&s->exec_context, f, prefix);
789 kill_context_dump(&s->kill_context, f, prefix);
790
791 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
792 if (!s->exec_command[c])
793 continue;
794
795 fprintf(f, "%s-> %s:\n",
796 prefix, socket_exec_command_to_string(c));
797
798 exec_command_dump_list(s->exec_command[c], f, prefix2);
799 }
800
801 cgroup_context_dump(UNIT(s), f, prefix);
802 }
803
804 static int instance_from_socket(int fd, unsigned nr, char **instance) {
805 socklen_t l;
806 char *r;
807 union sockaddr_union local, remote;
808
809 assert(fd >= 0);
810 assert(instance);
811
812 l = sizeof(local);
813 if (getsockname(fd, &local.sa, &l) < 0)
814 return -errno;
815
816 l = sizeof(remote);
817 if (getpeername(fd, &remote.sa, &l) < 0)
818 return -errno;
819
820 switch (local.sa.sa_family) {
821
822 case AF_INET: {
823 uint32_t
824 a = be32toh(local.in.sin_addr.s_addr),
825 b = be32toh(remote.in.sin_addr.s_addr);
826
827 if (asprintf(&r,
828 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
829 nr,
830 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
831 be16toh(local.in.sin_port),
832 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
833 be16toh(remote.in.sin_port)) < 0)
834 return -ENOMEM;
835
836 break;
837 }
838
839 case AF_INET6: {
840 static const unsigned char ipv4_prefix[] = {
841 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
842 };
843
844 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
845 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
846 const uint8_t
847 *a = local.in6.sin6_addr.s6_addr+12,
848 *b = remote.in6.sin6_addr.s6_addr+12;
849
850 if (asprintf(&r,
851 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
852 nr,
853 a[0], a[1], a[2], a[3],
854 be16toh(local.in6.sin6_port),
855 b[0], b[1], b[2], b[3],
856 be16toh(remote.in6.sin6_port)) < 0)
857 return -ENOMEM;
858 } else {
859 if (asprintf(&r,
860 "%u-%s:%u-%s:%u",
861 nr,
862 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
863 be16toh(local.in6.sin6_port),
864 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
865 be16toh(remote.in6.sin6_port)) < 0)
866 return -ENOMEM;
867 }
868
869 break;
870 }
871
872 case AF_UNIX: {
873 struct ucred ucred;
874 int k;
875
876 k = getpeercred(fd, &ucred);
877 if (k >= 0) {
878 if (asprintf(&r,
879 "%u-"PID_FMT"-"UID_FMT,
880 nr, ucred.pid, ucred.uid) < 0)
881 return -ENOMEM;
882 } else if (k == -ENODATA) {
883 /* This handles the case where somebody is
884 * connecting from another pid/uid namespace
885 * (e.g. from outside of our container). */
886 if (asprintf(&r,
887 "%u-unknown",
888 nr) < 0)
889 return -ENOMEM;
890 } else
891 return k;
892
893 break;
894 }
895
896 case AF_VSOCK:
897 if (asprintf(&r,
898 "%u-%u:%u-%u:%u",
899 nr,
900 local.vm.svm_cid, local.vm.svm_port,
901 remote.vm.svm_cid, remote.vm.svm_port) < 0)
902 return -ENOMEM;
903
904 break;
905
906 default:
907 assert_not_reached();
908 }
909
910 *instance = r;
911 return 0;
912 }
913
914 static void socket_close_fds(Socket *s) {
915 assert(s);
916
917 LIST_FOREACH(port, p, s->ports) {
918 bool was_open;
919
920 was_open = p->fd >= 0;
921
922 p->event_source = sd_event_source_disable_unref(p->event_source);
923 p->fd = safe_close(p->fd);
924 socket_cleanup_fd_list(p);
925
926 /* One little note: we should normally not delete any sockets in the file system here! After all some
927 * other process we spawned might still have a reference of this fd and wants to continue to use
928 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
929 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
930 * anyway, but only then. */
931
932 if (!was_open || !s->remove_on_stop)
933 continue;
934
935 switch (p->type) {
936
937 case SOCKET_FIFO:
938 (void) unlink(p->path);
939 break;
940
941 case SOCKET_MQUEUE:
942 (void) mq_unlink(p->path);
943 break;
944
945 case SOCKET_SOCKET:
946 (void) socket_address_unlink(&p->address);
947 break;
948
949 default:
950 break;
951 }
952 }
953
954 if (s->remove_on_stop)
955 STRV_FOREACH(i, s->symlinks)
956 (void) unlink(*i);
957
958 /* Note that we don't return NULL here, since s has not been freed. */
959 }
960
961 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
962 int r;
963
964 assert(s);
965 assert(p);
966 assert(fd >= 0);
967
968 if (s->keep_alive) {
969 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
970 if (r < 0)
971 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
972 }
973
974 if (s->keep_alive_time > 0) {
975 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
976 if (r < 0)
977 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
978 }
979
980 if (s->keep_alive_interval > 0) {
981 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
982 if (r < 0)
983 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
984 }
985
986 if (s->keep_alive_cnt > 0) {
987 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
988 if (r < 0)
989 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
990 }
991
992 if (s->defer_accept > 0) {
993 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
994 if (r < 0)
995 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
996 }
997
998 if (s->no_delay) {
999 if (s->socket_protocol == IPPROTO_SCTP) {
1000 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1001 if (r < 0)
1002 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1003 } else {
1004 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1005 if (r < 0)
1006 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1007 }
1008 }
1009
1010 if (s->broadcast) {
1011 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1012 if (r < 0)
1013 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1014 }
1015
1016 if (s->pass_cred) {
1017 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1018 if (r < 0)
1019 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1020 }
1021
1022 if (s->pass_sec) {
1023 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1024 if (r < 0)
1025 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1026 }
1027
1028 if (s->pass_pktinfo) {
1029 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1030 if (r < 0)
1031 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1032 }
1033
1034 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1035 r = setsockopt_int(fd, SOL_SOCKET,
1036 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1037 true);
1038 if (r < 0)
1039 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1040 }
1041
1042 if (s->priority >= 0) {
1043 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1044 if (r < 0)
1045 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1046 }
1047
1048 if (s->receive_buffer > 0) {
1049 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1050 if (r < 0)
1051 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1052 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1053 }
1054
1055 if (s->send_buffer > 0) {
1056 r = fd_set_sndbuf(fd, s->send_buffer, false);
1057 if (r < 0)
1058 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1059 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1060 }
1061
1062 if (s->mark >= 0) {
1063 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1064 if (r < 0)
1065 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1066 }
1067
1068 if (s->ip_tos >= 0) {
1069 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1070 if (r < 0)
1071 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1072 }
1073
1074 if (s->ip_ttl >= 0) {
1075 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1076 if (r < 0)
1077 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1078 }
1079
1080 if (s->tcp_congestion)
1081 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1082 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1083
1084 if (s->smack_ip_in) {
1085 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1086 if (r < 0)
1087 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1088 }
1089
1090 if (s->smack_ip_out) {
1091 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1092 if (r < 0)
1093 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1094 }
1095 }
1096
1097 static void socket_apply_fifo_options(Socket *s, int fd) {
1098 int r;
1099
1100 assert(s);
1101 assert(fd >= 0);
1102
1103 if (s->pipe_size > 0)
1104 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1105 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1106
1107 if (s->smack) {
1108 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1109 if (r < 0)
1110 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1111 }
1112 }
1113
1114 static int fifo_address_create(
1115 const char *path,
1116 mode_t directory_mode,
1117 mode_t socket_mode) {
1118
1119 _cleanup_close_ int fd = -1;
1120 mode_t old_mask;
1121 struct stat st;
1122 int r;
1123
1124 assert(path);
1125
1126 (void) mkdir_parents_label(path, directory_mode);
1127
1128 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1129 if (r < 0)
1130 return r;
1131
1132 /* Enforce the right access mode for the fifo */
1133 old_mask = umask(~socket_mode);
1134
1135 /* Include the original umask in our mask */
1136 (void) umask(~socket_mode | old_mask);
1137
1138 r = mkfifo(path, socket_mode);
1139 (void) umask(old_mask);
1140
1141 if (r < 0 && errno != EEXIST) {
1142 r = -errno;
1143 goto fail;
1144 }
1145
1146 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1147 if (fd < 0) {
1148 r = -errno;
1149 goto fail;
1150 }
1151
1152 mac_selinux_create_file_clear();
1153
1154 if (fstat(fd, &st) < 0) {
1155 r = -errno;
1156 goto fail;
1157 }
1158
1159 if (!S_ISFIFO(st.st_mode) ||
1160 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1161 st.st_uid != getuid() ||
1162 st.st_gid != getgid()) {
1163 r = -EEXIST;
1164 goto fail;
1165 }
1166
1167 return TAKE_FD(fd);
1168
1169 fail:
1170 mac_selinux_create_file_clear();
1171 return r;
1172 }
1173
1174 static int special_address_create(const char *path, bool writable) {
1175 _cleanup_close_ int fd = -1;
1176 struct stat st;
1177
1178 assert(path);
1179
1180 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1181 if (fd < 0)
1182 return -errno;
1183
1184 if (fstat(fd, &st) < 0)
1185 return -errno;
1186
1187 /* Check whether this is a /proc, /sys or /dev file or char device */
1188 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1189 return -EEXIST;
1190
1191 return TAKE_FD(fd);
1192 }
1193
1194 static int usbffs_address_create(const char *path) {
1195 _cleanup_close_ int fd = -1;
1196 struct stat st;
1197
1198 assert(path);
1199
1200 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1201 if (fd < 0)
1202 return -errno;
1203
1204 if (fstat(fd, &st) < 0)
1205 return -errno;
1206
1207 /* Check whether this is a regular file (ffs endpoint) */
1208 if (!S_ISREG(st.st_mode))
1209 return -EEXIST;
1210
1211 return TAKE_FD(fd);
1212 }
1213
1214 static int mq_address_create(
1215 const char *path,
1216 mode_t mq_mode,
1217 long maxmsg,
1218 long msgsize) {
1219
1220 _cleanup_close_ int fd = -1;
1221 struct stat st;
1222 mode_t old_mask;
1223 struct mq_attr _attr, *attr = NULL;
1224
1225 assert(path);
1226
1227 if (maxmsg > 0 && msgsize > 0) {
1228 _attr = (struct mq_attr) {
1229 .mq_flags = O_NONBLOCK,
1230 .mq_maxmsg = maxmsg,
1231 .mq_msgsize = msgsize,
1232 };
1233 attr = &_attr;
1234 }
1235
1236 /* Enforce the right access mode for the mq */
1237 old_mask = umask(~mq_mode);
1238
1239 /* Include the original umask in our mask */
1240 (void) umask(~mq_mode | old_mask);
1241 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1242 (void) umask(old_mask);
1243
1244 if (fd < 0)
1245 return -errno;
1246
1247 if (fstat(fd, &st) < 0)
1248 return -errno;
1249
1250 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1251 st.st_uid != getuid() ||
1252 st.st_gid != getgid())
1253 return -EEXIST;
1254
1255 return TAKE_FD(fd);
1256 }
1257
1258 static int socket_symlink(Socket *s) {
1259 const char *p;
1260 int r;
1261
1262 assert(s);
1263
1264 p = socket_find_symlink_target(s);
1265 if (!p)
1266 return 0;
1267
1268 STRV_FOREACH(i, s->symlinks) {
1269 (void) mkdir_parents_label(*i, s->directory_mode);
1270
1271 r = symlink_idempotent(p, *i, false);
1272
1273 if (r == -EEXIST && s->remove_on_stop) {
1274 /* If there's already something where we want to create the symlink, and the destructive
1275 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1276 * again. */
1277
1278 if (unlink(*i) >= 0)
1279 r = symlink_idempotent(p, *i, false);
1280 }
1281
1282 if (r < 0)
1283 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1284 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1285 }
1286
1287 return 0;
1288 }
1289
1290 static int usbffs_write_descs(int fd, Service *s) {
1291 int r;
1292
1293 if (!s->usb_function_descriptors || !s->usb_function_strings)
1294 return -EINVAL;
1295
1296 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1297 if (r < 0)
1298 return r;
1299
1300 return copy_file_fd(s->usb_function_strings, fd, 0);
1301 }
1302
1303 static int usbffs_select_ep(const struct dirent *d) {
1304 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1305 }
1306
1307 static int usbffs_dispatch_eps(SocketPort *p) {
1308 _cleanup_free_ struct dirent **ent = NULL;
1309 size_t n, k;
1310 int r;
1311
1312 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1313 if (r < 0)
1314 return -errno;
1315
1316 n = (size_t) r;
1317 p->auxiliary_fds = new(int, n);
1318 if (!p->auxiliary_fds) {
1319 r = -ENOMEM;
1320 goto clear;
1321 }
1322
1323 p->n_auxiliary_fds = n;
1324
1325 k = 0;
1326 for (size_t i = 0; i < n; ++i) {
1327 _cleanup_free_ char *ep = NULL;
1328
1329 ep = path_make_absolute(ent[i]->d_name, p->path);
1330 if (!ep) {
1331 r = -ENOMEM;
1332 goto fail;
1333 }
1334
1335 path_simplify(ep);
1336
1337 r = usbffs_address_create(ep);
1338 if (r < 0)
1339 goto fail;
1340
1341 p->auxiliary_fds[k++] = r;
1342 }
1343
1344 r = 0;
1345 goto clear;
1346
1347 fail:
1348 close_many(p->auxiliary_fds, k);
1349 p->auxiliary_fds = mfree(p->auxiliary_fds);
1350 p->n_auxiliary_fds = 0;
1351
1352 clear:
1353 for (size_t i = 0; i < n; ++i)
1354 free(ent[i]);
1355
1356 return r;
1357 }
1358
1359 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1360 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1361 *
1362 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1363 * instance name.
1364 */
1365
1366 if (UNIT_ISSET(s->service)) {
1367 *ret = UNIT_DEREF(s->service);
1368 return 0;
1369 }
1370
1371 if (!s->accept)
1372 return -ENODATA;
1373
1374 /* Build the instance name and load the unit */
1375 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1376 int r;
1377
1378 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1379 if (r < 0)
1380 return r;
1381
1382 if (cfd >= 0) {
1383 r = instance_from_socket(cfd, s->n_accepted, &instance);
1384 if (ERRNO_IS_DISCONNECT(r))
1385 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1386 * different errors. This connection is over, but the socket unit lives on. */
1387 return log_unit_debug_errno(UNIT(s), r,
1388 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1389 errno_to_name(r));
1390 if (r < 0)
1391 return r;
1392 }
1393
1394 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1395 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1396 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1397 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1398 if (r < 0)
1399 return r;
1400
1401 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1402 }
1403
1404 static int socket_determine_selinux_label(Socket *s, char **ret) {
1405 int r;
1406
1407 assert(s);
1408 assert(ret);
1409
1410 Unit *service;
1411 ExecCommand *c;
1412 const char *exec_context;
1413 _cleanup_free_ char *path = NULL;
1414
1415 r = socket_load_service_unit(s, -1, &service);
1416 if (r == -ENODATA)
1417 goto no_label;
1418 if (r < 0)
1419 return r;
1420
1421 exec_context = SERVICE(service)->exec_context.selinux_context;
1422 if (exec_context) {
1423 char *con;
1424
1425 con = strdup(exec_context);
1426 if (!con)
1427 return -ENOMEM;
1428
1429 *ret = TAKE_PTR(con);
1430 return 0;
1431 }
1432
1433 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1434 if (!c)
1435 goto no_label;
1436
1437 r = chase_symlinks(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1438 if (r < 0)
1439 goto no_label;
1440
1441 r = mac_selinux_get_create_label_from_exe(path, ret);
1442 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1443 goto no_label;
1444 return r;
1445
1446 no_label:
1447 *ret = NULL;
1448 return 0;
1449 }
1450
1451 static int socket_address_listen_do(
1452 Socket *s,
1453 const SocketAddress *address,
1454 const char *label) {
1455
1456 assert(s);
1457 assert(address);
1458
1459 return socket_address_listen(
1460 address,
1461 SOCK_CLOEXEC|SOCK_NONBLOCK,
1462 s->backlog,
1463 s->bind_ipv6_only,
1464 s->bind_to_device,
1465 s->reuse_port,
1466 s->free_bind,
1467 s->transparent,
1468 s->directory_mode,
1469 s->socket_mode,
1470 label);
1471 }
1472
1473 #define log_address_error_errno(u, address, error, fmt) \
1474 ({ \
1475 _cleanup_free_ char *_t = NULL; \
1476 \
1477 (void) socket_address_print(address, &_t); \
1478 log_unit_error_errno(u, error, fmt, strna(_t)); \
1479 })
1480
1481 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1482 int r;
1483
1484 assert(address);
1485 assert(context);
1486
1487 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1488
1489 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1490 r = bpf_firewall_supported();
1491 if (r < 0)
1492 return r;
1493 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1494 return true;
1495 }
1496
1497 return context->private_network || context->network_namespace_path;
1498 }
1499
1500 static int socket_address_listen_in_cgroup(
1501 Socket *s,
1502 const SocketAddress *address,
1503 const char *label) {
1504
1505 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1506 int fd, r;
1507 pid_t pid;
1508
1509 assert(s);
1510 assert(address);
1511
1512 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1513 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1514 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1515 * such. */
1516
1517 r = fork_needed(address, &s->exec_context);
1518 if (r < 0)
1519 return r;
1520 if (r == 0) {
1521 /* Shortcut things... */
1522 fd = socket_address_listen_do(s, address, label);
1523 if (fd < 0)
1524 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1525
1526 return fd;
1527 }
1528
1529 r = unit_setup_exec_runtime(UNIT(s));
1530 if (r < 0)
1531 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1532
1533 if (s->exec_context.network_namespace_path &&
1534 s->exec_runtime &&
1535 s->exec_runtime->netns_storage_socket[0] >= 0) {
1536 r = open_shareable_ns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1537 if (r < 0)
1538 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1539 }
1540
1541 if (s->exec_context.ipc_namespace_path &&
1542 s->exec_runtime &&
1543 s->exec_runtime->ipcns_storage_socket[0] >= 0) {
1544 r = open_shareable_ns_path(s->exec_runtime->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1545 if (r < 0)
1546 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1547 }
1548
1549 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1550 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1551
1552 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1553 if (r < 0)
1554 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1555 if (r == 0) {
1556 /* Child */
1557
1558 pair[0] = safe_close(pair[0]);
1559
1560 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1561 s->exec_runtime &&
1562 s->exec_runtime->netns_storage_socket[0] >= 0) {
1563
1564 if (ns_type_supported(NAMESPACE_NET)) {
1565 r = setup_shareable_ns(s->exec_runtime->netns_storage_socket, CLONE_NEWNET);
1566 if (r < 0) {
1567 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1568 _exit(EXIT_NETWORK);
1569 }
1570 } else if (s->exec_context.network_namespace_path) {
1571 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1572 _exit(EXIT_NETWORK);
1573 } else
1574 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1575 }
1576
1577 fd = socket_address_listen_do(s, address, label);
1578 if (fd < 0) {
1579 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1580 _exit(EXIT_FAILURE);
1581 }
1582
1583 r = send_one_fd(pair[1], fd, 0);
1584 if (r < 0) {
1585 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1586 _exit(EXIT_FAILURE);
1587 }
1588
1589 _exit(EXIT_SUCCESS);
1590 }
1591
1592 pair[1] = safe_close(pair[1]);
1593 fd = receive_one_fd(pair[0], 0);
1594
1595 /* We synchronously wait for the helper, as it shouldn't be slow */
1596 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1597 if (r < 0) {
1598 safe_close(fd);
1599 return r;
1600 }
1601
1602 if (fd < 0)
1603 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1604
1605 return fd;
1606 }
1607
1608 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1609
1610 static int socket_open_fds(Socket *orig_s) {
1611 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1612 _cleanup_(mac_selinux_freep) char *label = NULL;
1613 bool know_label = false;
1614 int r;
1615
1616 assert(s);
1617
1618 LIST_FOREACH(port, p, s->ports) {
1619
1620 if (p->fd >= 0)
1621 continue;
1622
1623 switch (p->type) {
1624
1625 case SOCKET_SOCKET:
1626
1627 if (!know_label) {
1628 /* Figure out the label, if we don't it know yet. We do it once for the first
1629 * socket where we need this and remember it for the rest. */
1630
1631 r = socket_determine_selinux_label(s, &label);
1632 if (r < 0)
1633 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1634
1635 know_label = true;
1636 }
1637
1638 /* Apply the socket protocol */
1639 switch (p->address.type) {
1640
1641 case SOCK_STREAM:
1642 case SOCK_SEQPACKET:
1643 if (s->socket_protocol == IPPROTO_SCTP)
1644 p->address.protocol = s->socket_protocol;
1645 break;
1646
1647 case SOCK_DGRAM:
1648 if (s->socket_protocol == IPPROTO_UDPLITE)
1649 p->address.protocol = s->socket_protocol;
1650 break;
1651 }
1652
1653 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1654 if (p->fd < 0)
1655 return p->fd;
1656
1657 socket_apply_socket_options(s, p, p->fd);
1658 socket_symlink(s);
1659 break;
1660
1661 case SOCKET_SPECIAL:
1662
1663 p->fd = special_address_create(p->path, s->writable);
1664 if (p->fd < 0)
1665 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1666 break;
1667
1668 case SOCKET_FIFO:
1669
1670 p->fd = fifo_address_create(
1671 p->path,
1672 s->directory_mode,
1673 s->socket_mode);
1674 if (p->fd < 0)
1675 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1676
1677 socket_apply_fifo_options(s, p->fd);
1678 socket_symlink(s);
1679 break;
1680
1681 case SOCKET_MQUEUE:
1682
1683 p->fd = mq_address_create(
1684 p->path,
1685 s->socket_mode,
1686 s->mq_maxmsg,
1687 s->mq_msgsize);
1688 if (p->fd < 0)
1689 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1690 break;
1691
1692 case SOCKET_USB_FUNCTION: {
1693 _cleanup_free_ char *ep = NULL;
1694
1695 ep = path_make_absolute("ep0", p->path);
1696 if (!ep)
1697 return -ENOMEM;
1698
1699 p->fd = usbffs_address_create(ep);
1700 if (p->fd < 0)
1701 return p->fd;
1702
1703 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1704 if (r < 0)
1705 return r;
1706
1707 r = usbffs_dispatch_eps(p);
1708 if (r < 0)
1709 return r;
1710
1711 break;
1712 }
1713 default:
1714 assert_not_reached();
1715 }
1716 }
1717
1718 s = NULL;
1719 return 0;
1720 }
1721
1722 static void socket_unwatch_fds(Socket *s) {
1723 int r;
1724
1725 assert(s);
1726
1727 LIST_FOREACH(port, p, s->ports) {
1728 if (p->fd < 0)
1729 continue;
1730
1731 if (!p->event_source)
1732 continue;
1733
1734 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1735 if (r < 0)
1736 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1737 }
1738 }
1739
1740 static int socket_watch_fds(Socket *s) {
1741 int r;
1742
1743 assert(s);
1744
1745 LIST_FOREACH(port, p, s->ports) {
1746 if (p->fd < 0)
1747 continue;
1748
1749 if (p->event_source) {
1750 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1751 if (r < 0)
1752 goto fail;
1753 } else {
1754 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1755 if (r < 0)
1756 goto fail;
1757
1758 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1759 }
1760 }
1761
1762 return 0;
1763
1764 fail:
1765 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1766 socket_unwatch_fds(s);
1767 return r;
1768 }
1769
1770 enum {
1771 SOCKET_OPEN_NONE,
1772 SOCKET_OPEN_SOME,
1773 SOCKET_OPEN_ALL,
1774 };
1775
1776 static int socket_check_open(Socket *s) {
1777 bool have_open = false, have_closed = false;
1778
1779 assert(s);
1780
1781 LIST_FOREACH(port, p, s->ports) {
1782 if (p->fd < 0)
1783 have_closed = true;
1784 else
1785 have_open = true;
1786
1787 if (have_open && have_closed)
1788 return SOCKET_OPEN_SOME;
1789 }
1790
1791 if (have_open)
1792 return SOCKET_OPEN_ALL;
1793
1794 return SOCKET_OPEN_NONE;
1795 }
1796
1797 static void socket_set_state(Socket *s, SocketState state) {
1798 SocketState old_state;
1799 assert(s);
1800
1801 if (s->state != state)
1802 bus_unit_send_pending_change_signal(UNIT(s), false);
1803
1804 old_state = s->state;
1805 s->state = state;
1806
1807 if (!IN_SET(state,
1808 SOCKET_START_PRE,
1809 SOCKET_START_CHOWN,
1810 SOCKET_START_POST,
1811 SOCKET_STOP_PRE,
1812 SOCKET_STOP_PRE_SIGTERM,
1813 SOCKET_STOP_PRE_SIGKILL,
1814 SOCKET_STOP_POST,
1815 SOCKET_FINAL_SIGTERM,
1816 SOCKET_FINAL_SIGKILL,
1817 SOCKET_CLEANING)) {
1818
1819 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1820 socket_unwatch_control_pid(s);
1821 s->control_command = NULL;
1822 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1823 }
1824
1825 if (state != SOCKET_LISTENING)
1826 socket_unwatch_fds(s);
1827
1828 if (!IN_SET(state,
1829 SOCKET_START_CHOWN,
1830 SOCKET_START_POST,
1831 SOCKET_LISTENING,
1832 SOCKET_RUNNING,
1833 SOCKET_STOP_PRE,
1834 SOCKET_STOP_PRE_SIGTERM,
1835 SOCKET_STOP_PRE_SIGKILL,
1836 SOCKET_CLEANING))
1837 socket_close_fds(s);
1838
1839 if (state != old_state)
1840 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1841
1842 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1843 }
1844
1845 static int socket_coldplug(Unit *u) {
1846 Socket *s = SOCKET(u);
1847 int r;
1848
1849 assert(s);
1850 assert(s->state == SOCKET_DEAD);
1851
1852 if (s->deserialized_state == s->state)
1853 return 0;
1854
1855 if (s->control_pid > 0 &&
1856 pid_is_unwaited(s->control_pid) &&
1857 IN_SET(s->deserialized_state,
1858 SOCKET_START_PRE,
1859 SOCKET_START_CHOWN,
1860 SOCKET_START_POST,
1861 SOCKET_STOP_PRE,
1862 SOCKET_STOP_PRE_SIGTERM,
1863 SOCKET_STOP_PRE_SIGKILL,
1864 SOCKET_STOP_POST,
1865 SOCKET_FINAL_SIGTERM,
1866 SOCKET_FINAL_SIGKILL,
1867 SOCKET_CLEANING)) {
1868
1869 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1870 if (r < 0)
1871 return r;
1872
1873 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1874 if (r < 0)
1875 return r;
1876 }
1877
1878 if (IN_SET(s->deserialized_state,
1879 SOCKET_START_CHOWN,
1880 SOCKET_START_POST,
1881 SOCKET_LISTENING,
1882 SOCKET_RUNNING)) {
1883
1884 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1885 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1886 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1887 * and if there's a mismatch, warn loudly. */
1888
1889 r = socket_check_open(s);
1890 if (r == SOCKET_OPEN_NONE)
1891 log_unit_warning(UNIT(s),
1892 "Socket unit configuration has changed while unit has been running, "
1893 "no open socket file descriptor left. "
1894 "The socket unit is not functional until restarted.");
1895 else if (r == SOCKET_OPEN_SOME)
1896 log_unit_warning(UNIT(s),
1897 "Socket unit configuration has changed while unit has been running, "
1898 "and some socket file descriptors have not been opened yet. "
1899 "The socket unit is not fully functional until restarted.");
1900 }
1901
1902 if (s->deserialized_state == SOCKET_LISTENING) {
1903 r = socket_watch_fds(s);
1904 if (r < 0)
1905 return r;
1906 }
1907
1908 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1909 (void) unit_setup_dynamic_creds(u);
1910 (void) unit_setup_exec_runtime(u);
1911 }
1912
1913 socket_set_state(s, s->deserialized_state);
1914 return 0;
1915 }
1916
1917 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1918
1919 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1920 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1921 .stdin_fd = -1,
1922 .stdout_fd = -1,
1923 .stderr_fd = -1,
1924 .exec_fd = -1,
1925 };
1926 pid_t pid;
1927 int r;
1928
1929 assert(s);
1930 assert(c);
1931 assert(_pid);
1932
1933 r = unit_prepare_exec(UNIT(s));
1934 if (r < 0)
1935 return r;
1936
1937 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1938 if (r < 0)
1939 return r;
1940
1941 r = unit_set_exec_params(UNIT(s), &exec_params);
1942 if (r < 0)
1943 return r;
1944
1945 r = exec_spawn(UNIT(s),
1946 c,
1947 &s->exec_context,
1948 &exec_params,
1949 s->exec_runtime,
1950 &s->dynamic_creds,
1951 &pid);
1952 if (r < 0)
1953 return r;
1954
1955 r = unit_watch_pid(UNIT(s), pid, true);
1956 if (r < 0)
1957 return r;
1958
1959 *_pid = pid;
1960
1961 return 0;
1962 }
1963
1964 static int socket_chown(Socket *s, pid_t *_pid) {
1965 pid_t pid;
1966 int r;
1967
1968 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1969 if (r < 0)
1970 goto fail;
1971
1972 /* We have to resolve the user names out-of-process, hence
1973 * let's fork here. It's messy, but well, what can we do? */
1974
1975 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1976 if (r < 0)
1977 return r;
1978 if (r == 0) {
1979 uid_t uid = UID_INVALID;
1980 gid_t gid = GID_INVALID;
1981
1982 /* Child */
1983
1984 if (!isempty(s->user)) {
1985 const char *user = s->user;
1986
1987 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1988 if (r < 0) {
1989 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1990 _exit(EXIT_USER);
1991 }
1992 }
1993
1994 if (!isempty(s->group)) {
1995 const char *group = s->group;
1996
1997 r = get_group_creds(&group, &gid, 0);
1998 if (r < 0) {
1999 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2000 _exit(EXIT_GROUP);
2001 }
2002 }
2003
2004 LIST_FOREACH(port, p, s->ports) {
2005 const char *path = NULL;
2006
2007 if (p->type == SOCKET_SOCKET)
2008 path = socket_address_get_path(&p->address);
2009 else if (p->type == SOCKET_FIFO)
2010 path = p->path;
2011
2012 if (!path)
2013 continue;
2014
2015 if (chown(path, uid, gid) < 0) {
2016 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2017 _exit(EXIT_CHOWN);
2018 }
2019 }
2020
2021 _exit(EXIT_SUCCESS);
2022 }
2023
2024 r = unit_watch_pid(UNIT(s), pid, true);
2025 if (r < 0)
2026 goto fail;
2027
2028 *_pid = pid;
2029 return 0;
2030
2031 fail:
2032 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2033 return r;
2034 }
2035
2036 static void socket_enter_dead(Socket *s, SocketResult f) {
2037 assert(s);
2038
2039 if (s->result == SOCKET_SUCCESS)
2040 s->result = f;
2041
2042 if (s->result == SOCKET_SUCCESS)
2043 unit_log_success(UNIT(s));
2044 else
2045 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2046
2047 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2048
2049 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2050
2051 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2052
2053 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2054
2055 unit_unref_uid_gid(UNIT(s), true);
2056
2057 dynamic_creds_destroy(&s->dynamic_creds);
2058 }
2059
2060 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2061
2062 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2063 int r;
2064 assert(s);
2065
2066 if (s->result == SOCKET_SUCCESS)
2067 s->result = f;
2068
2069 socket_unwatch_control_pid(s);
2070 s->control_command_id = SOCKET_EXEC_STOP_POST;
2071 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2072
2073 if (s->control_command) {
2074 r = socket_spawn(s, s->control_command, &s->control_pid);
2075 if (r < 0)
2076 goto fail;
2077
2078 socket_set_state(s, SOCKET_STOP_POST);
2079 } else
2080 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2081
2082 return;
2083
2084 fail:
2085 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2086 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2087 }
2088
2089 static int state_to_kill_operation(Socket *s, SocketState state) {
2090 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2091 return KILL_RESTART;
2092
2093 if (state == SOCKET_FINAL_SIGTERM)
2094 return KILL_TERMINATE;
2095
2096 return KILL_KILL;
2097 }
2098
2099 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2100 int r;
2101
2102 assert(s);
2103
2104 if (s->result == SOCKET_SUCCESS)
2105 s->result = f;
2106
2107 r = unit_kill_context(
2108 UNIT(s),
2109 &s->kill_context,
2110 state_to_kill_operation(s, state),
2111 -1,
2112 s->control_pid,
2113 false);
2114 if (r < 0)
2115 goto fail;
2116
2117 if (r > 0) {
2118 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2119 if (r < 0)
2120 goto fail;
2121
2122 socket_set_state(s, state);
2123 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2124 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2125 else if (state == SOCKET_STOP_PRE_SIGKILL)
2126 socket_enter_stop_post(s, SOCKET_SUCCESS);
2127 else if (state == SOCKET_FINAL_SIGTERM)
2128 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2129 else
2130 socket_enter_dead(s, SOCKET_SUCCESS);
2131
2132 return;
2133
2134 fail:
2135 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2136
2137 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2138 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2139 else
2140 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2141 }
2142
2143 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2144 int r;
2145 assert(s);
2146
2147 if (s->result == SOCKET_SUCCESS)
2148 s->result = f;
2149
2150 socket_unwatch_control_pid(s);
2151 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2152 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2153
2154 if (s->control_command) {
2155 r = socket_spawn(s, s->control_command, &s->control_pid);
2156 if (r < 0)
2157 goto fail;
2158
2159 socket_set_state(s, SOCKET_STOP_PRE);
2160 } else
2161 socket_enter_stop_post(s, SOCKET_SUCCESS);
2162
2163 return;
2164
2165 fail:
2166 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2167 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2168 }
2169
2170 static void socket_enter_listening(Socket *s) {
2171 int r;
2172 assert(s);
2173
2174 if (!s->accept && s->flush_pending) {
2175 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2176 flush_ports(s);
2177 }
2178
2179 r = socket_watch_fds(s);
2180 if (r < 0) {
2181 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2182 goto fail;
2183 }
2184
2185 socket_set_state(s, SOCKET_LISTENING);
2186 return;
2187
2188 fail:
2189 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2190 }
2191
2192 static void socket_enter_start_post(Socket *s) {
2193 int r;
2194 assert(s);
2195
2196 socket_unwatch_control_pid(s);
2197 s->control_command_id = SOCKET_EXEC_START_POST;
2198 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2199
2200 if (s->control_command) {
2201 r = socket_spawn(s, s->control_command, &s->control_pid);
2202 if (r < 0) {
2203 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2204 goto fail;
2205 }
2206
2207 socket_set_state(s, SOCKET_START_POST);
2208 } else
2209 socket_enter_listening(s);
2210
2211 return;
2212
2213 fail:
2214 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2215 }
2216
2217 static void socket_enter_start_chown(Socket *s) {
2218 int r;
2219
2220 assert(s);
2221
2222 r = socket_open_fds(s);
2223 if (r < 0) {
2224 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2225 goto fail;
2226 }
2227
2228 if (!isempty(s->user) || !isempty(s->group)) {
2229
2230 socket_unwatch_control_pid(s);
2231 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2232 s->control_command = NULL;
2233
2234 r = socket_chown(s, &s->control_pid);
2235 if (r < 0) {
2236 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2237 goto fail;
2238 }
2239
2240 socket_set_state(s, SOCKET_START_CHOWN);
2241 } else
2242 socket_enter_start_post(s);
2243
2244 return;
2245
2246 fail:
2247 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2248 }
2249
2250 static void socket_enter_start_pre(Socket *s) {
2251 int r;
2252 assert(s);
2253
2254 socket_unwatch_control_pid(s);
2255
2256 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2257
2258 s->control_command_id = SOCKET_EXEC_START_PRE;
2259 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2260
2261 if (s->control_command) {
2262 r = socket_spawn(s, s->control_command, &s->control_pid);
2263 if (r < 0) {
2264 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2265 goto fail;
2266 }
2267
2268 socket_set_state(s, SOCKET_START_PRE);
2269 } else
2270 socket_enter_start_chown(s);
2271
2272 return;
2273
2274 fail:
2275 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2276 }
2277
2278 static void flush_ports(Socket *s) {
2279 assert(s);
2280
2281 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2282 * anymore */
2283
2284 LIST_FOREACH(port, p, s->ports) {
2285 if (p->fd < 0)
2286 continue;
2287
2288 (void) flush_accept(p->fd);
2289 (void) flush_fd(p->fd);
2290 }
2291 }
2292
2293 static void socket_enter_running(Socket *s, int cfd_in) {
2294 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2295 * somewhere or close it. */
2296 _cleanup_close_ int cfd = cfd_in;
2297
2298 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2299 int r;
2300
2301 assert(s);
2302
2303 /* We don't take connections anymore if we are supposed to shut down anyway */
2304 if (unit_stop_pending(UNIT(s))) {
2305
2306 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2307
2308 if (cfd >= 0)
2309 goto refuse;
2310
2311 flush_ports(s);
2312 return;
2313 }
2314
2315 if (!ratelimit_below(&s->trigger_limit)) {
2316 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2317 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2318 goto refuse;
2319 }
2320
2321 if (cfd < 0) {
2322 bool pending = false;
2323 Unit *other;
2324
2325 /* If there's already a start pending don't bother to do anything */
2326 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2327 if (unit_active_or_pending(other)) {
2328 pending = true;
2329 break;
2330 }
2331
2332 if (!pending) {
2333 if (!UNIT_ISSET(s->service)) {
2334 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2335 "Service to activate vanished, refusing activation.");
2336 goto fail;
2337 }
2338
2339 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2340 if (r < 0)
2341 goto fail;
2342 }
2343
2344 socket_set_state(s, SOCKET_RUNNING);
2345 } else {
2346 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2347 Unit *service;
2348
2349 if (s->n_connections >= s->max_connections) {
2350 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2351 s->n_connections);
2352 goto refuse;
2353 }
2354
2355 if (s->max_connections_per_source > 0) {
2356 r = socket_acquire_peer(s, cfd, &p);
2357 if (ERRNO_IS_DISCONNECT(r))
2358 return;
2359 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2360 goto fail;
2361 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2362 _cleanup_free_ char *t = NULL;
2363
2364 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2365
2366 log_unit_warning(UNIT(s),
2367 "Too many incoming connections (%u) from source %s, dropping connection.",
2368 p->n_ref, strnull(t));
2369 goto refuse;
2370 }
2371 }
2372
2373 r = socket_load_service_unit(s, cfd, &service);
2374 if (ERRNO_IS_DISCONNECT(r))
2375 return;
2376 if (r < 0)
2377 goto fail;
2378
2379 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2380 false, UNIT_DEPENDENCY_IMPLICIT);
2381 if (r < 0)
2382 goto fail;
2383
2384 s->n_accepted++;
2385
2386 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2387 if (ERRNO_IS_DISCONNECT(r))
2388 return;
2389 if (r < 0)
2390 goto fail;
2391
2392 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2393 s->n_connections++;
2394
2395 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2396 if (r < 0) {
2397 /* We failed to activate the new service, but it still exists. Let's make sure the
2398 * service closes and forgets the connection fd again, immediately. */
2399 service_close_socket_fd(SERVICE(service));
2400 goto fail;
2401 }
2402
2403 /* Notify clients about changed counters */
2404 unit_add_to_dbus_queue(UNIT(s));
2405 }
2406
2407 TAKE_FD(cfd);
2408 return;
2409
2410 refuse:
2411 s->n_refused++;
2412 return;
2413
2414 fail:
2415 if (ERRNO_IS_RESOURCE(r))
2416 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2417 bus_error_message(&error, r));
2418 else
2419 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2420 cfd >= 0 ? "template" : "non-template",
2421 bus_error_message(&error, r));
2422
2423 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2424 }
2425
2426 static void socket_run_next(Socket *s) {
2427 int r;
2428
2429 assert(s);
2430 assert(s->control_command);
2431 assert(s->control_command->command_next);
2432
2433 socket_unwatch_control_pid(s);
2434
2435 s->control_command = s->control_command->command_next;
2436
2437 r = socket_spawn(s, s->control_command, &s->control_pid);
2438 if (r < 0)
2439 goto fail;
2440
2441 return;
2442
2443 fail:
2444 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2445
2446 if (s->state == SOCKET_START_POST)
2447 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2448 else if (s->state == SOCKET_STOP_POST)
2449 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2450 else
2451 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2452 }
2453
2454 static int socket_start(Unit *u) {
2455 Socket *s = SOCKET(u);
2456 int r;
2457
2458 assert(s);
2459
2460 /* We cannot fulfill this request right now, try again later
2461 * please! */
2462 if (IN_SET(s->state,
2463 SOCKET_STOP_PRE,
2464 SOCKET_STOP_PRE_SIGKILL,
2465 SOCKET_STOP_PRE_SIGTERM,
2466 SOCKET_STOP_POST,
2467 SOCKET_FINAL_SIGTERM,
2468 SOCKET_FINAL_SIGKILL,
2469 SOCKET_CLEANING))
2470 return -EAGAIN;
2471
2472 /* Already on it! */
2473 if (IN_SET(s->state,
2474 SOCKET_START_PRE,
2475 SOCKET_START_CHOWN,
2476 SOCKET_START_POST))
2477 return 0;
2478
2479 /* Cannot run this without the service being around */
2480 if (UNIT_ISSET(s->service)) {
2481 Service *service;
2482
2483 service = SERVICE(UNIT_DEREF(s->service));
2484
2485 if (UNIT(service)->load_state != UNIT_LOADED)
2486 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2487
2488 /* If the service is already active we cannot start the
2489 * socket */
2490 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
2491 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2492 }
2493
2494 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2495
2496 r = unit_acquire_invocation_id(u);
2497 if (r < 0)
2498 return r;
2499
2500 s->result = SOCKET_SUCCESS;
2501 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2502
2503 u->reset_accounting = true;
2504
2505 socket_enter_start_pre(s);
2506 return 1;
2507 }
2508
2509 static int socket_stop(Unit *u) {
2510 Socket *s = SOCKET(u);
2511
2512 assert(s);
2513
2514 /* Already on it */
2515 if (IN_SET(s->state,
2516 SOCKET_STOP_PRE,
2517 SOCKET_STOP_PRE_SIGTERM,
2518 SOCKET_STOP_PRE_SIGKILL,
2519 SOCKET_STOP_POST,
2520 SOCKET_FINAL_SIGTERM,
2521 SOCKET_FINAL_SIGKILL))
2522 return 0;
2523
2524 /* If there's already something running we go directly into
2525 * kill mode. */
2526 if (IN_SET(s->state,
2527 SOCKET_START_PRE,
2528 SOCKET_START_CHOWN,
2529 SOCKET_START_POST)) {
2530 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2531 return -EAGAIN;
2532 }
2533
2534 /* If we are currently cleaning, then abort it, brutally. */
2535 if (s->state == SOCKET_CLEANING) {
2536 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2537 return 0;
2538 }
2539
2540 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2541
2542 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2543 return 1;
2544 }
2545
2546 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2547 Socket *s = SOCKET(u);
2548 int r;
2549
2550 assert(u);
2551 assert(f);
2552 assert(fds);
2553
2554 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2555 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2556 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2557 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2558
2559 if (s->control_pid > 0)
2560 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2561
2562 if (s->control_command_id >= 0)
2563 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2564
2565 LIST_FOREACH(port, p, s->ports) {
2566 int copy;
2567
2568 if (p->fd < 0)
2569 continue;
2570
2571 copy = fdset_put_dup(fds, p->fd);
2572 if (copy < 0)
2573 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2574
2575 if (p->type == SOCKET_SOCKET) {
2576 _cleanup_free_ char *t = NULL;
2577
2578 r = socket_address_print(&p->address, &t);
2579 if (r < 0)
2580 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2581
2582 if (socket_address_family(&p->address) == AF_NETLINK)
2583 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2584 else
2585 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2586 } else if (p->type == SOCKET_SPECIAL)
2587 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2588 else if (p->type == SOCKET_MQUEUE)
2589 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2590 else if (p->type == SOCKET_USB_FUNCTION)
2591 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2592 else {
2593 assert(p->type == SOCKET_FIFO);
2594 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2595 }
2596 }
2597
2598 return 0;
2599 }
2600
2601 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2602 Socket *s = SOCKET(u);
2603
2604 assert(u);
2605 assert(key);
2606 assert(value);
2607
2608 if (streq(key, "state")) {
2609 SocketState state;
2610
2611 state = socket_state_from_string(value);
2612 if (state < 0)
2613 log_unit_debug(u, "Failed to parse state value: %s", value);
2614 else
2615 s->deserialized_state = state;
2616 } else if (streq(key, "result")) {
2617 SocketResult f;
2618
2619 f = socket_result_from_string(value);
2620 if (f < 0)
2621 log_unit_debug(u, "Failed to parse result value: %s", value);
2622 else if (f != SOCKET_SUCCESS)
2623 s->result = f;
2624
2625 } else if (streq(key, "n-accepted")) {
2626 unsigned k;
2627
2628 if (safe_atou(value, &k) < 0)
2629 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2630 else
2631 s->n_accepted += k;
2632 } else if (streq(key, "n-refused")) {
2633 unsigned k;
2634
2635 if (safe_atou(value, &k) < 0)
2636 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2637 else
2638 s->n_refused += k;
2639 } else if (streq(key, "control-pid")) {
2640 pid_t pid;
2641
2642 if (parse_pid(value, &pid) < 0)
2643 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2644 else
2645 s->control_pid = pid;
2646 } else if (streq(key, "control-command")) {
2647 SocketExecCommand id;
2648
2649 id = socket_exec_command_from_string(value);
2650 if (id < 0)
2651 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2652 else {
2653 s->control_command_id = id;
2654 s->control_command = s->exec_command[id];
2655 }
2656 } else if (streq(key, "fifo")) {
2657 int fd, skip = 0;
2658
2659 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2660 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2661 else {
2662 bool found = false;
2663
2664 LIST_FOREACH(port, p, s->ports)
2665 if (p->fd < 0 &&
2666 p->type == SOCKET_FIFO &&
2667 path_equal_or_files_same(p->path, value+skip, 0)) {
2668 p->fd = fdset_remove(fds, fd);
2669 found = true;
2670 break;
2671 }
2672 if (!found)
2673 log_unit_debug(u, "No matching fifo socket found: %s", value+skip);
2674 }
2675
2676 } else if (streq(key, "special")) {
2677 int fd, skip = 0;
2678
2679 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2680 log_unit_debug(u, "Failed to parse special value: %s", value);
2681 else {
2682 bool found = false;
2683
2684 LIST_FOREACH(port, p, s->ports)
2685 if (p->fd < 0 &&
2686 p->type == SOCKET_SPECIAL &&
2687 path_equal_or_files_same(p->path, value+skip, 0)) {
2688 p->fd = fdset_remove(fds, fd);
2689 found = true;
2690 break;
2691 }
2692 if (!found)
2693 log_unit_debug(u, "No matching special socket found: %s", value+skip);
2694 }
2695
2696 } else if (streq(key, "mqueue")) {
2697 int fd, skip = 0;
2698
2699 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2700 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2701 else {
2702 bool found = false;
2703
2704 LIST_FOREACH(port, p, s->ports)
2705 if (p->fd < 0 &&
2706 p->type == SOCKET_MQUEUE &&
2707 streq(p->path, value+skip)) {
2708 p->fd = fdset_remove(fds, fd);
2709 found = true;
2710 break;
2711 }
2712 if (!found)
2713 log_unit_debug(u, "No matching mqueue socket found: %s", value+skip);
2714 }
2715
2716 } else if (streq(key, "socket")) {
2717 int fd, type, skip = 0;
2718
2719 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2720 log_unit_debug(u, "Failed to parse socket value: %s", value);
2721 else {
2722 bool found = false;
2723
2724 LIST_FOREACH(port, p, s->ports)
2725 if (p->fd < 0 &&
2726 socket_address_is(&p->address, value+skip, type)) {
2727 p->fd = fdset_remove(fds, fd);
2728 found = true;
2729 break;
2730 }
2731 if (!found)
2732 log_unit_debug(u, "No matching %s socket found: %s",
2733 socket_address_type_to_string(type), value+skip);
2734 }
2735
2736 } else if (streq(key, "netlink")) {
2737 int fd, skip = 0;
2738
2739 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2740 log_unit_debug(u, "Failed to parse socket value: %s", value);
2741 else {
2742 bool found = false;
2743
2744 LIST_FOREACH(port, p, s->ports)
2745 if (p->fd < 0 &&
2746 socket_address_is_netlink(&p->address, value+skip)) {
2747 p->fd = fdset_remove(fds, fd);
2748 found = true;
2749 break;
2750 }
2751 if (!found)
2752 log_unit_debug(u, "No matching netlink socket found: %s", value+skip);
2753 }
2754
2755 } else if (streq(key, "ffs")) {
2756 int fd, skip = 0;
2757
2758 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2759 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2760 else {
2761 bool found = false;
2762
2763 LIST_FOREACH(port, p, s->ports)
2764 if (p->fd < 0 &&
2765 p->type == SOCKET_USB_FUNCTION &&
2766 path_equal_or_files_same(p->path, value+skip, 0)) {
2767 p->fd = fdset_remove(fds, fd);
2768 found = true;
2769 break;
2770 }
2771 if (!found)
2772 log_unit_debug(u, "No matching ffs socket found: %s", value+skip);
2773 }
2774
2775 } else
2776 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2777
2778 return 0;
2779 }
2780
2781 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2782 Socket *s = SOCKET(u);
2783
2784 assert(u);
2785
2786 LIST_FOREACH(port, p, s->ports) {
2787 int fd;
2788
2789 if (p->type != SOCKET_SOCKET)
2790 continue;
2791
2792 if (p->fd >= 0)
2793 continue;
2794
2795 FDSET_FOREACH(fd, fds) {
2796 if (socket_address_matches_fd(&p->address, fd)) {
2797 p->fd = fdset_remove(fds, fd);
2798 s->deserialized_state = SOCKET_LISTENING;
2799 break;
2800 }
2801 }
2802 }
2803 }
2804
2805 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2806 assert(u);
2807
2808 return state_translation_table[SOCKET(u)->state];
2809 }
2810
2811 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2812 assert(u);
2813
2814 return socket_state_to_string(SOCKET(u)->state);
2815 }
2816
2817 const char* socket_port_type_to_string(SocketPort *p) {
2818
2819 assert(p);
2820
2821 switch (p->type) {
2822
2823 case SOCKET_SOCKET:
2824
2825 switch (p->address.type) {
2826
2827 case SOCK_STREAM:
2828 return "Stream";
2829
2830 case SOCK_DGRAM:
2831 return "Datagram";
2832
2833 case SOCK_SEQPACKET:
2834 return "SequentialPacket";
2835
2836 case SOCK_RAW:
2837 if (socket_address_family(&p->address) == AF_NETLINK)
2838 return "Netlink";
2839
2840 _fallthrough_;
2841 default:
2842 return NULL;
2843 }
2844
2845 case SOCKET_SPECIAL:
2846 return "Special";
2847
2848 case SOCKET_MQUEUE:
2849 return "MessageQueue";
2850
2851 case SOCKET_FIFO:
2852 return "FIFO";
2853
2854 case SOCKET_USB_FUNCTION:
2855 return "USBFunction";
2856
2857 default:
2858 return NULL;
2859 }
2860 }
2861
2862 SocketType socket_port_type_from_string(const char *s) {
2863 assert(s);
2864
2865 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2866 return SOCKET_SOCKET;
2867 else if (streq(s, "Special"))
2868 return SOCKET_SPECIAL;
2869 else if (streq(s, "MessageQueue"))
2870 return SOCKET_MQUEUE;
2871 else if (streq(s, "FIFO"))
2872 return SOCKET_FIFO;
2873 else if (streq(s, "USBFunction"))
2874 return SOCKET_USB_FUNCTION;
2875 else
2876 return _SOCKET_TYPE_INVALID;
2877 }
2878
2879 _pure_ static bool socket_may_gc(Unit *u) {
2880 Socket *s = SOCKET(u);
2881
2882 assert(u);
2883
2884 return s->n_connections == 0;
2885 }
2886
2887 static int socket_accept_do(Socket *s, int fd) {
2888 int cfd;
2889
2890 assert(s);
2891 assert(fd >= 0);
2892
2893 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2894 if (cfd < 0)
2895 /* Convert transient network errors into clean and well-defined EAGAIN */
2896 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2897
2898 return cfd;
2899 }
2900
2901 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2902 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2903 int cfd, r;
2904 pid_t pid;
2905
2906 assert(s);
2907 assert(p);
2908 assert(fd >= 0);
2909
2910 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2911 * connection socket is also properly associated with the cgroup. */
2912
2913 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2914 goto shortcut;
2915
2916 r = bpf_firewall_supported();
2917 if (r < 0)
2918 return r;
2919 if (r == BPF_FIREWALL_UNSUPPORTED)
2920 goto shortcut;
2921
2922 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2923 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2924
2925 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2926 if (r < 0)
2927 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2928 if (r == 0) {
2929 /* Child */
2930
2931 pair[0] = safe_close(pair[0]);
2932
2933 cfd = socket_accept_do(s, fd);
2934 if (cfd == -EAGAIN) /* spurious accept() */
2935 _exit(EXIT_SUCCESS);
2936 if (cfd < 0) {
2937 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2938 _exit(EXIT_FAILURE);
2939 }
2940
2941 r = send_one_fd(pair[1], cfd, 0);
2942 if (r < 0) {
2943 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2944 _exit(EXIT_FAILURE);
2945 }
2946
2947 _exit(EXIT_SUCCESS);
2948 }
2949
2950 pair[1] = safe_close(pair[1]);
2951 cfd = receive_one_fd(pair[0], 0);
2952
2953 /* We synchronously wait for the helper, as it shouldn't be slow */
2954 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2955 if (r < 0) {
2956 safe_close(cfd);
2957 return r;
2958 }
2959
2960 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2961 * this is a spurious accept(), let's convert that back to EAGAIN here. */
2962 if (cfd == -EIO)
2963 return -EAGAIN;
2964 if (cfd < 0)
2965 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2966
2967 return cfd;
2968
2969 shortcut:
2970 cfd = socket_accept_do(s, fd);
2971 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
2972 return -EAGAIN;
2973 if (cfd < 0)
2974 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2975
2976 return cfd;
2977 }
2978
2979 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2980 SocketPort *p = ASSERT_PTR(userdata);
2981 int cfd = -1;
2982
2983 assert(fd >= 0);
2984
2985 if (p->socket->state != SOCKET_LISTENING)
2986 return 0;
2987
2988 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2989
2990 if (revents != EPOLLIN) {
2991 if (revents & EPOLLHUP)
2992 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.");
2993 else
2994 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2995 goto fail;
2996 }
2997
2998 if (p->socket->accept &&
2999 p->type == SOCKET_SOCKET &&
3000 socket_address_can_accept(&p->address)) {
3001
3002 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3003 if (cfd == -EAGAIN) /* Spurious accept() */
3004 return 0;
3005 if (cfd < 0)
3006 goto fail;
3007
3008 socket_apply_socket_options(p->socket, p, cfd);
3009 }
3010
3011 socket_enter_running(p->socket, cfd);
3012 return 0;
3013
3014 fail:
3015 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3016 return 0;
3017 }
3018
3019 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3020 Socket *s = SOCKET(u);
3021 SocketResult f;
3022
3023 assert(s);
3024 assert(pid >= 0);
3025
3026 if (pid != s->control_pid)
3027 return;
3028
3029 s->control_pid = 0;
3030
3031 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3032 f = SOCKET_SUCCESS;
3033 else if (code == CLD_EXITED)
3034 f = SOCKET_FAILURE_EXIT_CODE;
3035 else if (code == CLD_KILLED)
3036 f = SOCKET_FAILURE_SIGNAL;
3037 else if (code == CLD_DUMPED)
3038 f = SOCKET_FAILURE_CORE_DUMP;
3039 else
3040 assert_not_reached();
3041
3042 if (s->control_command) {
3043 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3044
3045 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3046 f = SOCKET_SUCCESS;
3047 }
3048
3049 unit_log_process_exit(
3050 u,
3051 "Control process",
3052 socket_exec_command_to_string(s->control_command_id),
3053 f == SOCKET_SUCCESS,
3054 code, status);
3055
3056 if (s->result == SOCKET_SUCCESS)
3057 s->result = f;
3058
3059 if (s->control_command &&
3060 s->control_command->command_next &&
3061 f == SOCKET_SUCCESS) {
3062
3063 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3064 socket_run_next(s);
3065 } else {
3066 s->control_command = NULL;
3067 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3068
3069 /* No further commands for this step, so let's figure
3070 * out what to do next */
3071
3072 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3073
3074 switch (s->state) {
3075
3076 case SOCKET_START_PRE:
3077 if (f == SOCKET_SUCCESS)
3078 socket_enter_start_chown(s);
3079 else
3080 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3081 break;
3082
3083 case SOCKET_START_CHOWN:
3084 if (f == SOCKET_SUCCESS)
3085 socket_enter_start_post(s);
3086 else
3087 socket_enter_stop_pre(s, f);
3088 break;
3089
3090 case SOCKET_START_POST:
3091 if (f == SOCKET_SUCCESS)
3092 socket_enter_listening(s);
3093 else
3094 socket_enter_stop_pre(s, f);
3095 break;
3096
3097 case SOCKET_STOP_PRE:
3098 case SOCKET_STOP_PRE_SIGTERM:
3099 case SOCKET_STOP_PRE_SIGKILL:
3100 socket_enter_stop_post(s, f);
3101 break;
3102
3103 case SOCKET_STOP_POST:
3104 case SOCKET_FINAL_SIGTERM:
3105 case SOCKET_FINAL_SIGKILL:
3106 socket_enter_dead(s, f);
3107 break;
3108
3109 case SOCKET_CLEANING:
3110
3111 if (s->clean_result == SOCKET_SUCCESS)
3112 s->clean_result = f;
3113
3114 socket_enter_dead(s, SOCKET_SUCCESS);
3115 break;
3116
3117 default:
3118 assert_not_reached();
3119 }
3120 }
3121
3122 /* Notify clients about changed exit status */
3123 unit_add_to_dbus_queue(u);
3124 }
3125
3126 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3127 Socket *s = SOCKET(userdata);
3128
3129 assert(s);
3130 assert(s->timer_event_source == source);
3131
3132 switch (s->state) {
3133
3134 case SOCKET_START_PRE:
3135 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3136 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3137 break;
3138
3139 case SOCKET_START_CHOWN:
3140 case SOCKET_START_POST:
3141 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3142 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3143 break;
3144
3145 case SOCKET_STOP_PRE:
3146 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3147 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3148 break;
3149
3150 case SOCKET_STOP_PRE_SIGTERM:
3151 if (s->kill_context.send_sigkill) {
3152 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3153 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3154 } else {
3155 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3156 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3157 }
3158 break;
3159
3160 case SOCKET_STOP_PRE_SIGKILL:
3161 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3162 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3163 break;
3164
3165 case SOCKET_STOP_POST:
3166 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3167 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3168 break;
3169
3170 case SOCKET_FINAL_SIGTERM:
3171 if (s->kill_context.send_sigkill) {
3172 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3173 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3174 } else {
3175 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3176 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3177 }
3178 break;
3179
3180 case SOCKET_FINAL_SIGKILL:
3181 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3182 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3183 break;
3184
3185 case SOCKET_CLEANING:
3186 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3187
3188 if (s->clean_result == SOCKET_SUCCESS)
3189 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3190
3191 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3192 break;
3193
3194 default:
3195 assert_not_reached();
3196 }
3197
3198 return 0;
3199 }
3200
3201 int socket_collect_fds(Socket *s, int **fds) {
3202 size_t k = 0, n = 0;
3203 int *rfds;
3204
3205 assert(s);
3206 assert(fds);
3207
3208 /* Called from the service code for requesting our fds */
3209
3210 LIST_FOREACH(port, p, s->ports) {
3211 if (p->fd >= 0)
3212 n++;
3213 n += p->n_auxiliary_fds;
3214 }
3215
3216 if (n <= 0) {
3217 *fds = NULL;
3218 return 0;
3219 }
3220
3221 rfds = new(int, n);
3222 if (!rfds)
3223 return -ENOMEM;
3224
3225 LIST_FOREACH(port, p, s->ports) {
3226 if (p->fd >= 0)
3227 rfds[k++] = p->fd;
3228 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3229 rfds[k++] = p->auxiliary_fds[i];
3230 }
3231
3232 assert(k == n);
3233
3234 *fds = rfds;
3235 return (int) n;
3236 }
3237
3238 static void socket_reset_failed(Unit *u) {
3239 Socket *s = SOCKET(u);
3240
3241 assert(s);
3242
3243 if (s->state == SOCKET_FAILED)
3244 socket_set_state(s, SOCKET_DEAD);
3245
3246 s->result = SOCKET_SUCCESS;
3247 s->clean_result = SOCKET_SUCCESS;
3248 }
3249
3250 void socket_connection_unref(Socket *s) {
3251 assert(s);
3252
3253 /* The service is dead. Yay!
3254 *
3255 * This is strictly for one-instance-per-connection
3256 * services. */
3257
3258 assert(s->n_connections > 0);
3259 s->n_connections--;
3260
3261 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3262 }
3263
3264 static void socket_trigger_notify(Unit *u, Unit *other) {
3265 Socket *s = SOCKET(u);
3266
3267 assert(u);
3268 assert(other);
3269
3270 /* Filter out invocations with bogus state */
3271 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3272 assert(other->type == UNIT_SERVICE);
3273
3274 /* Don't propagate state changes from the service if we are already down */
3275 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3276 return;
3277
3278 /* We don't care for the service state if we are in Accept=yes mode */
3279 if (s->accept)
3280 return;
3281
3282 /* Propagate start limit hit state */
3283 if (other->start_limit_hit) {
3284 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3285 return;
3286 }
3287
3288 /* Don't propagate anything if there's still a job queued */
3289 if (other->job)
3290 return;
3291
3292 if (IN_SET(SERVICE(other)->state,
3293 SERVICE_DEAD, SERVICE_FAILED,
3294 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3295 SERVICE_AUTO_RESTART))
3296 socket_enter_listening(s);
3297
3298 if (SERVICE(other)->state == SERVICE_RUNNING)
3299 socket_set_state(s, SOCKET_RUNNING);
3300 }
3301
3302 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3303 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3304 }
3305
3306 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3307 Socket *s = SOCKET(u);
3308 usec_t t;
3309 int r;
3310
3311 if (!s->timer_event_source)
3312 return 0;
3313
3314 r = sd_event_source_get_time(s->timer_event_source, &t);
3315 if (r < 0)
3316 return r;
3317 if (t == USEC_INFINITY)
3318 return 0;
3319
3320 *timeout = t;
3321 return 1;
3322 }
3323
3324 char *socket_fdname(Socket *s) {
3325 assert(s);
3326
3327 /* Returns the name to use for $LISTEN_NAMES. If the user
3328 * didn't specify anything specifically, use the socket unit's
3329 * name as fallback. */
3330
3331 return s->fdname ?: UNIT(s)->id;
3332 }
3333
3334 static int socket_control_pid(Unit *u) {
3335 Socket *s = SOCKET(u);
3336
3337 assert(s);
3338
3339 return s->control_pid;
3340 }
3341
3342 static int socket_clean(Unit *u, ExecCleanMask mask) {
3343 _cleanup_strv_free_ char **l = NULL;
3344 Socket *s = SOCKET(u);
3345 int r;
3346
3347 assert(s);
3348 assert(mask != 0);
3349
3350 if (s->state != SOCKET_DEAD)
3351 return -EBUSY;
3352
3353 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3354 if (r < 0)
3355 return r;
3356
3357 if (strv_isempty(l))
3358 return -EUNATCH;
3359
3360 socket_unwatch_control_pid(s);
3361 s->clean_result = SOCKET_SUCCESS;
3362 s->control_command = NULL;
3363 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3364
3365 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3366 if (r < 0)
3367 goto fail;
3368
3369 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3370 if (r < 0)
3371 goto fail;
3372
3373 socket_set_state(s, SOCKET_CLEANING);
3374
3375 return 0;
3376
3377 fail:
3378 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3379 s->clean_result = SOCKET_FAILURE_RESOURCES;
3380 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3381 return r;
3382 }
3383
3384 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3385 Socket *s = SOCKET(u);
3386
3387 assert(s);
3388
3389 return exec_context_get_clean_mask(&s->exec_context, ret);
3390 }
3391
3392 static int socket_can_start(Unit *u) {
3393 Socket *s = SOCKET(u);
3394 int r;
3395
3396 assert(s);
3397
3398 r = unit_test_start_limit(u);
3399 if (r < 0) {
3400 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3401 return r;
3402 }
3403
3404 return 1;
3405 }
3406
3407 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3408 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3409 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3410 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3411 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3412 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3413 };
3414
3415 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3416
3417 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3418 [SOCKET_SUCCESS] = "success",
3419 [SOCKET_FAILURE_RESOURCES] = "resources",
3420 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3421 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3422 [SOCKET_FAILURE_SIGNAL] = "signal",
3423 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3424 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3425 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3426 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3427 };
3428
3429 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3430
3431 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3432 [SOCKET_TIMESTAMPING_OFF] = "off",
3433 [SOCKET_TIMESTAMPING_US] = "us",
3434 [SOCKET_TIMESTAMPING_NS] = "ns",
3435 };
3436
3437 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3438
3439 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3440 SocketTimestamping t;
3441 int r;
3442
3443 if (!p)
3444 return _SOCKET_TIMESTAMPING_INVALID;
3445
3446 t = socket_timestamping_from_string(p);
3447 if (t >= 0)
3448 return t;
3449
3450 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3451 * too. */
3452 if (streq(p, "nsec"))
3453 return SOCKET_TIMESTAMPING_NS;
3454 if (STR_IN_SET(p, "usec", "µs"))
3455 return SOCKET_TIMESTAMPING_US;
3456
3457 r = parse_boolean(p);
3458 if (r < 0)
3459 return _SOCKET_TIMESTAMPING_INVALID;
3460
3461 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3462 }
3463
3464 const UnitVTable socket_vtable = {
3465 .object_size = sizeof(Socket),
3466 .exec_context_offset = offsetof(Socket, exec_context),
3467 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3468 .kill_context_offset = offsetof(Socket, kill_context),
3469 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3470 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3471
3472 .sections =
3473 "Unit\0"
3474 "Socket\0"
3475 "Install\0",
3476 .private_section = "Socket",
3477
3478 .can_transient = true,
3479 .can_trigger = true,
3480 .can_fail = true,
3481
3482 .init = socket_init,
3483 .done = socket_done,
3484 .load = socket_load,
3485
3486 .coldplug = socket_coldplug,
3487
3488 .dump = socket_dump,
3489
3490 .start = socket_start,
3491 .stop = socket_stop,
3492
3493 .kill = socket_kill,
3494 .clean = socket_clean,
3495 .can_clean = socket_can_clean,
3496
3497 .get_timeout = socket_get_timeout,
3498
3499 .serialize = socket_serialize,
3500 .deserialize_item = socket_deserialize_item,
3501 .distribute_fds = socket_distribute_fds,
3502
3503 .active_state = socket_active_state,
3504 .sub_state_to_string = socket_sub_state_to_string,
3505
3506 .will_restart = unit_will_restart_default,
3507
3508 .may_gc = socket_may_gc,
3509
3510 .sigchld_event = socket_sigchld_event,
3511
3512 .trigger_notify = socket_trigger_notify,
3513
3514 .reset_failed = socket_reset_failed,
3515
3516 .control_pid = socket_control_pid,
3517
3518 .bus_set_property = bus_socket_set_property,
3519 .bus_commit_properties = bus_socket_commit_properties,
3520
3521 .status_message_formats = {
3522 .finished_start_job = {
3523 [JOB_DONE] = "Listening on %s.",
3524 [JOB_FAILED] = "Failed to listen on %s.",
3525 [JOB_TIMEOUT] = "Timed out starting %s.",
3526 },
3527 .finished_stop_job = {
3528 [JOB_DONE] = "Closed %s.",
3529 [JOB_FAILED] = "Failed stopping %s.",
3530 [JOB_TIMEOUT] = "Timed out stopping %s.",
3531 },
3532 },
3533
3534 .can_start = socket_can_start,
3535 };
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