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Merge pull request #22939 from yuwata/tree-wide-space
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase-symlinks.h"
18 #include "copy.h"
19 #include "dbus-socket.h"
20 #include "dbus-unit.h"
21 #include "def.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = UINT_MAX;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid));
113 }
114
115 static void socket_cleanup_fd_list(SocketPort *p) {
116 assert(p);
117
118 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
119 p->auxiliary_fds = mfree(p->auxiliary_fds);
120 p->n_auxiliary_fds = 0;
121 }
122
123 void socket_free_ports(Socket *s) {
124 SocketPort *p;
125
126 assert(s);
127
128 while ((p = s->ports)) {
129 LIST_REMOVE(port, s->ports, p);
130
131 sd_event_source_unref(p->event_source);
132
133 socket_cleanup_fd_list(p);
134 safe_close(p->fd);
135 free(p->path);
136 free(p);
137 }
138 }
139
140 static void socket_done(Unit *u) {
141 Socket *s = SOCKET(u);
142 SocketPeer *p;
143
144 assert(s);
145
146 socket_free_ports(s);
147
148 while ((p = set_steal_first(s->peers_by_address)))
149 p->socket = NULL;
150
151 s->peers_by_address = set_free(s->peers_by_address);
152
153 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
154 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
155 s->control_command = NULL;
156
157 dynamic_creds_unref(&s->dynamic_creds);
158
159 socket_unwatch_control_pid(s);
160
161 unit_ref_unset(&s->service);
162
163 s->tcp_congestion = mfree(s->tcp_congestion);
164 s->bind_to_device = mfree(s->bind_to_device);
165
166 s->smack = mfree(s->smack);
167 s->smack_ip_in = mfree(s->smack_ip_in);
168 s->smack_ip_out = mfree(s->smack_ip_out);
169
170 strv_free(s->symlinks);
171
172 s->user = mfree(s->user);
173 s->group = mfree(s->group);
174
175 s->fdname = mfree(s->fdname);
176
177 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
178 }
179
180 static int socket_arm_timer(Socket *s, usec_t usec) {
181 int r;
182
183 assert(s);
184
185 if (s->timer_event_source) {
186 r = sd_event_source_set_time(s->timer_event_source, usec);
187 if (r < 0)
188 return r;
189
190 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
191 }
192
193 if (usec == USEC_INFINITY)
194 return 0;
195
196 r = sd_event_add_time(
197 UNIT(s)->manager->event,
198 &s->timer_event_source,
199 CLOCK_MONOTONIC,
200 usec, 0,
201 socket_dispatch_timer, s);
202 if (r < 0)
203 return r;
204
205 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
206
207 return 0;
208 }
209
210 static bool have_non_accept_socket(Socket *s) {
211 assert(s);
212
213 if (!s->accept)
214 return true;
215
216 LIST_FOREACH(port, p, s->ports) {
217
218 if (p->type != SOCKET_SOCKET)
219 return true;
220
221 if (!socket_address_can_accept(&p->address))
222 return true;
223 }
224
225 return false;
226 }
227
228 static int socket_add_mount_dependencies(Socket *s) {
229 int r;
230
231 assert(s);
232
233 LIST_FOREACH(port, p, s->ports) {
234 const char *path = NULL;
235
236 if (p->type == SOCKET_SOCKET)
237 path = socket_address_get_path(&p->address);
238 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
239 path = p->path;
240
241 if (!path)
242 continue;
243
244 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
245 if (r < 0)
246 return r;
247 }
248
249 return 0;
250 }
251
252 static int socket_add_device_dependencies(Socket *s) {
253 char *t;
254
255 assert(s);
256
257 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
258 return 0;
259
260 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
261 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
262 }
263
264 static int socket_add_default_dependencies(Socket *s) {
265 int r;
266 assert(s);
267
268 if (!UNIT(s)->default_dependencies)
269 return 0;
270
271 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
272 if (r < 0)
273 return r;
274
275 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
276 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279 }
280
281 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 }
283
284 _pure_ static bool socket_has_exec(Socket *s) {
285 unsigned i;
286 assert(s);
287
288 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
289 if (s->exec_command[i])
290 return true;
291
292 return false;
293 }
294
295 static int socket_add_extras(Socket *s) {
296 Unit *u = UNIT(s);
297 int r;
298
299 assert(s);
300
301 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
302 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
303 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
304 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
305 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
306 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
307 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
308 * service starts are typical. */
309
310 if (s->trigger_limit.interval == USEC_INFINITY)
311 s->trigger_limit.interval = 2 * USEC_PER_SEC;
312
313 if (s->trigger_limit.burst == UINT_MAX) {
314 if (s->accept)
315 s->trigger_limit.burst = 200;
316 else
317 s->trigger_limit.burst = 20;
318 }
319
320 if (have_non_accept_socket(s)) {
321
322 if (!UNIT_DEREF(s->service)) {
323 Unit *x;
324
325 r = unit_load_related_unit(u, ".service", &x);
326 if (r < 0)
327 return r;
328
329 unit_ref_set(&s->service, u, x);
330 }
331
332 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
333 if (r < 0)
334 return r;
335 }
336
337 r = socket_add_mount_dependencies(s);
338 if (r < 0)
339 return r;
340
341 r = socket_add_device_dependencies(s);
342 if (r < 0)
343 return r;
344
345 r = unit_patch_contexts(u);
346 if (r < 0)
347 return r;
348
349 if (socket_has_exec(s)) {
350 r = unit_add_exec_dependencies(u, &s->exec_context);
351 if (r < 0)
352 return r;
353 }
354
355 r = unit_set_default_slice(u);
356 if (r < 0)
357 return r;
358
359 r = socket_add_default_dependencies(s);
360 if (r < 0)
361 return r;
362
363 return 0;
364 }
365
366 static const char *socket_find_symlink_target(Socket *s) {
367 const char *found = NULL;
368
369 LIST_FOREACH(port, p, s->ports) {
370 const char *f = NULL;
371
372 switch (p->type) {
373
374 case SOCKET_FIFO:
375 f = p->path;
376 break;
377
378 case SOCKET_SOCKET:
379 f = socket_address_get_path(&p->address);
380 break;
381
382 default:
383 break;
384 }
385
386 if (f) {
387 if (found)
388 return NULL;
389
390 found = f;
391 }
392 }
393
394 return found;
395 }
396
397 static int socket_verify(Socket *s) {
398 assert(s);
399 assert(UNIT(s)->load_state == UNIT_LOADED);
400
401 if (!s->ports)
402 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
403
404 if (s->accept && have_non_accept_socket(s))
405 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
406
407 if (s->accept && s->max_connections <= 0)
408 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
409
410 if (s->accept && UNIT_DEREF(s->service))
411 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
412
413 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
414 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
415
416 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
417 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
418
419 return 0;
420 }
421
422 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
423 assert(s);
424
425 if (s->peer.sa.sa_family == AF_INET)
426 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
427 else if (s->peer.sa.sa_family == AF_INET6)
428 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
429 else if (s->peer.sa.sa_family == AF_VSOCK)
430 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
431 else
432 assert_not_reached();
433 }
434
435 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
436 int r;
437
438 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
439 if (r != 0)
440 return r;
441
442 switch (x->peer.sa.sa_family) {
443 case AF_INET:
444 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
445 case AF_INET6:
446 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
447 case AF_VSOCK:
448 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
449 }
450 assert_not_reached();
451 }
452
453 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
454
455 static int socket_load(Unit *u) {
456 Socket *s = SOCKET(u);
457 int r;
458
459 assert(u);
460 assert(u->load_state == UNIT_STUB);
461
462 r = unit_load_fragment_and_dropin(u, true);
463 if (r < 0)
464 return r;
465
466 if (u->load_state != UNIT_LOADED)
467 return 0;
468
469 /* This is a new unit? Then let's add in some extras */
470 r = socket_add_extras(s);
471 if (r < 0)
472 return r;
473
474 return socket_verify(s);
475 }
476
477 static SocketPeer *socket_peer_new(void) {
478 SocketPeer *p;
479
480 p = new(SocketPeer, 1);
481 if (!p)
482 return NULL;
483
484 *p = (SocketPeer) {
485 .n_ref = 1,
486 };
487 return p;
488 }
489
490 static SocketPeer *socket_peer_free(SocketPeer *p) {
491 assert(p);
492
493 if (p->socket)
494 set_remove(p->socket->peers_by_address, p);
495
496 return mfree(p);
497 }
498
499 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
500
501 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
502 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
503 SocketPeer sa = {
504 .peer_salen = sizeof(union sockaddr_union),
505 }, *i;
506 int r;
507
508 assert(fd >= 0);
509 assert(s);
510
511 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
512 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
513
514 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
515 *p = NULL;
516 return 0;
517 }
518
519 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
520 if (r < 0)
521 return r;
522
523 i = set_get(s->peers_by_address, &sa);
524 if (i) {
525 *p = socket_peer_ref(i);
526 return 1;
527 }
528
529 remote = socket_peer_new();
530 if (!remote)
531 return log_oom();
532
533 remote->peer = sa.peer;
534 remote->peer_salen = sa.peer_salen;
535
536 r = set_put(s->peers_by_address, remote);
537 if (r < 0)
538 return r;
539
540 remote->socket = s;
541
542 *p = TAKE_PTR(remote);
543 return 1;
544 }
545
546 _const_ static const char* listen_lookup(int family, int type) {
547
548 if (family == AF_NETLINK)
549 return "ListenNetlink";
550
551 if (type == SOCK_STREAM)
552 return "ListenStream";
553 else if (type == SOCK_DGRAM)
554 return "ListenDatagram";
555 else if (type == SOCK_SEQPACKET)
556 return "ListenSequentialPacket";
557
558 assert_not_reached();
559 return NULL;
560 }
561
562 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
563 Socket *s = SOCKET(u);
564 const char *prefix2, *str;
565
566 assert(s);
567 assert(f);
568
569 prefix = strempty(prefix);
570 prefix2 = strjoina(prefix, "\t");
571
572 fprintf(f,
573 "%sSocket State: %s\n"
574 "%sResult: %s\n"
575 "%sClean Result: %s\n"
576 "%sBindIPv6Only: %s\n"
577 "%sBacklog: %u\n"
578 "%sSocketMode: %04o\n"
579 "%sDirectoryMode: %04o\n"
580 "%sKeepAlive: %s\n"
581 "%sNoDelay: %s\n"
582 "%sFreeBind: %s\n"
583 "%sTransparent: %s\n"
584 "%sBroadcast: %s\n"
585 "%sPassCredentials: %s\n"
586 "%sPassSecurity: %s\n"
587 "%sPassPacketInfo: %s\n"
588 "%sTCPCongestion: %s\n"
589 "%sRemoveOnStop: %s\n"
590 "%sWritable: %s\n"
591 "%sFileDescriptorName: %s\n"
592 "%sSELinuxContextFromNet: %s\n",
593 prefix, socket_state_to_string(s->state),
594 prefix, socket_result_to_string(s->result),
595 prefix, socket_result_to_string(s->clean_result),
596 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
597 prefix, s->backlog,
598 prefix, s->socket_mode,
599 prefix, s->directory_mode,
600 prefix, yes_no(s->keep_alive),
601 prefix, yes_no(s->no_delay),
602 prefix, yes_no(s->free_bind),
603 prefix, yes_no(s->transparent),
604 prefix, yes_no(s->broadcast),
605 prefix, yes_no(s->pass_cred),
606 prefix, yes_no(s->pass_sec),
607 prefix, yes_no(s->pass_pktinfo),
608 prefix, strna(s->tcp_congestion),
609 prefix, yes_no(s->remove_on_stop),
610 prefix, yes_no(s->writable),
611 prefix, socket_fdname(s),
612 prefix, yes_no(s->selinux_context_from_net));
613
614 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
615 fprintf(f,
616 "%sTimestamping: %s\n",
617 prefix, socket_timestamping_to_string(s->timestamping));
618
619 if (s->control_pid > 0)
620 fprintf(f,
621 "%sControl PID: "PID_FMT"\n",
622 prefix, s->control_pid);
623
624 if (s->bind_to_device)
625 fprintf(f,
626 "%sBindToDevice: %s\n",
627 prefix, s->bind_to_device);
628
629 if (s->accept)
630 fprintf(f,
631 "%sAccepted: %u\n"
632 "%sNConnections: %u\n"
633 "%sMaxConnections: %u\n"
634 "%sMaxConnectionsPerSource: %u\n",
635 prefix, s->n_accepted,
636 prefix, s->n_connections,
637 prefix, s->max_connections,
638 prefix, s->max_connections_per_source);
639 else
640 fprintf(f,
641 "%sFlushPending: %s\n",
642 prefix, yes_no(s->flush_pending));
643
644
645 if (s->priority >= 0)
646 fprintf(f,
647 "%sPriority: %i\n",
648 prefix, s->priority);
649
650 if (s->receive_buffer > 0)
651 fprintf(f,
652 "%sReceiveBuffer: %zu\n",
653 prefix, s->receive_buffer);
654
655 if (s->send_buffer > 0)
656 fprintf(f,
657 "%sSendBuffer: %zu\n",
658 prefix, s->send_buffer);
659
660 if (s->ip_tos >= 0)
661 fprintf(f,
662 "%sIPTOS: %i\n",
663 prefix, s->ip_tos);
664
665 if (s->ip_ttl >= 0)
666 fprintf(f,
667 "%sIPTTL: %i\n",
668 prefix, s->ip_ttl);
669
670 if (s->pipe_size > 0)
671 fprintf(f,
672 "%sPipeSize: %zu\n",
673 prefix, s->pipe_size);
674
675 if (s->mark >= 0)
676 fprintf(f,
677 "%sMark: %i\n",
678 prefix, s->mark);
679
680 if (s->mq_maxmsg > 0)
681 fprintf(f,
682 "%sMessageQueueMaxMessages: %li\n",
683 prefix, s->mq_maxmsg);
684
685 if (s->mq_msgsize > 0)
686 fprintf(f,
687 "%sMessageQueueMessageSize: %li\n",
688 prefix, s->mq_msgsize);
689
690 if (s->reuse_port)
691 fprintf(f,
692 "%sReusePort: %s\n",
693 prefix, yes_no(s->reuse_port));
694
695 if (s->smack)
696 fprintf(f,
697 "%sSmackLabel: %s\n",
698 prefix, s->smack);
699
700 if (s->smack_ip_in)
701 fprintf(f,
702 "%sSmackLabelIPIn: %s\n",
703 prefix, s->smack_ip_in);
704
705 if (s->smack_ip_out)
706 fprintf(f,
707 "%sSmackLabelIPOut: %s\n",
708 prefix, s->smack_ip_out);
709
710 if (!isempty(s->user) || !isempty(s->group))
711 fprintf(f,
712 "%sSocketUser: %s\n"
713 "%sSocketGroup: %s\n",
714 prefix, strna(s->user),
715 prefix, strna(s->group));
716
717 if (s->keep_alive_time > 0)
718 fprintf(f,
719 "%sKeepAliveTimeSec: %s\n",
720 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
721
722 if (s->keep_alive_interval > 0)
723 fprintf(f,
724 "%sKeepAliveIntervalSec: %s\n",
725 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
726
727 if (s->keep_alive_cnt > 0)
728 fprintf(f,
729 "%sKeepAliveProbes: %u\n",
730 prefix, s->keep_alive_cnt);
731
732 if (s->defer_accept > 0)
733 fprintf(f,
734 "%sDeferAcceptSec: %s\n",
735 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
736
737 LIST_FOREACH(port, p, s->ports) {
738
739 switch (p->type) {
740 case SOCKET_SOCKET: {
741 _cleanup_free_ char *k = NULL;
742 const char *t;
743 int r;
744
745 r = socket_address_print(&p->address, &k);
746 if (r < 0)
747 t = strerror_safe(r);
748 else
749 t = k;
750
751 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
752 break;
753 }
754 case SOCKET_SPECIAL:
755 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
756 break;
757 case SOCKET_USB_FUNCTION:
758 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
759 break;
760 case SOCKET_MQUEUE:
761 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
762 break;
763 default:
764 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
765 }
766 }
767
768 fprintf(f,
769 "%sTriggerLimitIntervalSec: %s\n"
770 "%sTriggerLimitBurst: %u\n",
771 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
772 prefix, s->trigger_limit.burst);
773
774 str = ip_protocol_to_name(s->socket_protocol);
775 if (str)
776 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
777
778 if (!strv_isempty(s->symlinks)) {
779 fprintf(f, "%sSymlinks:", prefix);
780 STRV_FOREACH(q, s->symlinks)
781 fprintf(f, " %s", *q);
782
783 fprintf(f, "\n");
784 }
785
786 fprintf(f,
787 "%sTimeoutSec: %s\n",
788 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
789
790 exec_context_dump(&s->exec_context, f, prefix);
791 kill_context_dump(&s->kill_context, f, prefix);
792
793 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
794 if (!s->exec_command[c])
795 continue;
796
797 fprintf(f, "%s-> %s:\n",
798 prefix, socket_exec_command_to_string(c));
799
800 exec_command_dump_list(s->exec_command[c], f, prefix2);
801 }
802
803 cgroup_context_dump(UNIT(s), f, prefix);
804 }
805
806 static int instance_from_socket(int fd, unsigned nr, char **instance) {
807 socklen_t l;
808 char *r;
809 union sockaddr_union local, remote;
810
811 assert(fd >= 0);
812 assert(instance);
813
814 l = sizeof(local);
815 if (getsockname(fd, &local.sa, &l) < 0)
816 return -errno;
817
818 l = sizeof(remote);
819 if (getpeername(fd, &remote.sa, &l) < 0)
820 return -errno;
821
822 switch (local.sa.sa_family) {
823
824 case AF_INET: {
825 uint32_t
826 a = be32toh(local.in.sin_addr.s_addr),
827 b = be32toh(remote.in.sin_addr.s_addr);
828
829 if (asprintf(&r,
830 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
831 nr,
832 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
833 be16toh(local.in.sin_port),
834 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
835 be16toh(remote.in.sin_port)) < 0)
836 return -ENOMEM;
837
838 break;
839 }
840
841 case AF_INET6: {
842 static const unsigned char ipv4_prefix[] = {
843 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
844 };
845
846 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
847 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
848 const uint8_t
849 *a = local.in6.sin6_addr.s6_addr+12,
850 *b = remote.in6.sin6_addr.s6_addr+12;
851
852 if (asprintf(&r,
853 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
854 nr,
855 a[0], a[1], a[2], a[3],
856 be16toh(local.in6.sin6_port),
857 b[0], b[1], b[2], b[3],
858 be16toh(remote.in6.sin6_port)) < 0)
859 return -ENOMEM;
860 } else {
861 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
862
863 if (asprintf(&r,
864 "%u-%s:%u-%s:%u",
865 nr,
866 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
867 be16toh(local.in6.sin6_port),
868 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
869 be16toh(remote.in6.sin6_port)) < 0)
870 return -ENOMEM;
871 }
872
873 break;
874 }
875
876 case AF_UNIX: {
877 struct ucred ucred;
878 int k;
879
880 k = getpeercred(fd, &ucred);
881 if (k >= 0) {
882 if (asprintf(&r,
883 "%u-"PID_FMT"-"UID_FMT,
884 nr, ucred.pid, ucred.uid) < 0)
885 return -ENOMEM;
886 } else if (k == -ENODATA) {
887 /* This handles the case where somebody is
888 * connecting from another pid/uid namespace
889 * (e.g. from outside of our container). */
890 if (asprintf(&r,
891 "%u-unknown",
892 nr) < 0)
893 return -ENOMEM;
894 } else
895 return k;
896
897 break;
898 }
899
900 case AF_VSOCK:
901 if (asprintf(&r,
902 "%u-%u:%u-%u:%u",
903 nr,
904 local.vm.svm_cid, local.vm.svm_port,
905 remote.vm.svm_cid, remote.vm.svm_port) < 0)
906 return -ENOMEM;
907
908 break;
909
910 default:
911 assert_not_reached();
912 }
913
914 *instance = r;
915 return 0;
916 }
917
918 static void socket_close_fds(Socket *s) {
919 assert(s);
920
921 LIST_FOREACH(port, p, s->ports) {
922 bool was_open;
923
924 was_open = p->fd >= 0;
925
926 p->event_source = sd_event_source_disable_unref(p->event_source);
927 p->fd = safe_close(p->fd);
928 socket_cleanup_fd_list(p);
929
930 /* One little note: we should normally not delete any sockets in the file system here! After all some
931 * other process we spawned might still have a reference of this fd and wants to continue to use
932 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
933 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
934 * anyway, but only then. */
935
936 if (!was_open || !s->remove_on_stop)
937 continue;
938
939 switch (p->type) {
940
941 case SOCKET_FIFO:
942 (void) unlink(p->path);
943 break;
944
945 case SOCKET_MQUEUE:
946 (void) mq_unlink(p->path);
947 break;
948
949 case SOCKET_SOCKET:
950 (void) socket_address_unlink(&p->address);
951 break;
952
953 default:
954 break;
955 }
956 }
957
958 if (s->remove_on_stop)
959 STRV_FOREACH(i, s->symlinks)
960 (void) unlink(*i);
961
962 /* Note that we don't return NULL here, since s has not been freed. */
963 }
964
965 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
966 int r;
967
968 assert(s);
969 assert(p);
970 assert(fd >= 0);
971
972 if (s->keep_alive) {
973 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
974 if (r < 0)
975 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
976 }
977
978 if (s->keep_alive_time > 0) {
979 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
980 if (r < 0)
981 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
982 }
983
984 if (s->keep_alive_interval > 0) {
985 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
986 if (r < 0)
987 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
988 }
989
990 if (s->keep_alive_cnt > 0) {
991 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
992 if (r < 0)
993 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
994 }
995
996 if (s->defer_accept > 0) {
997 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
998 if (r < 0)
999 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1000 }
1001
1002 if (s->no_delay) {
1003 if (s->socket_protocol == IPPROTO_SCTP) {
1004 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1005 if (r < 0)
1006 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1007 } else {
1008 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1009 if (r < 0)
1010 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1011 }
1012 }
1013
1014 if (s->broadcast) {
1015 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1016 if (r < 0)
1017 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1018 }
1019
1020 if (s->pass_cred) {
1021 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1022 if (r < 0)
1023 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1024 }
1025
1026 if (s->pass_sec) {
1027 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1028 if (r < 0)
1029 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1030 }
1031
1032 if (s->pass_pktinfo) {
1033 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1034 if (r < 0)
1035 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1036 }
1037
1038 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1039 r = setsockopt_int(fd, SOL_SOCKET,
1040 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1041 true);
1042 if (r < 0)
1043 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1044 }
1045
1046 if (s->priority >= 0) {
1047 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1048 if (r < 0)
1049 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1050 }
1051
1052 if (s->receive_buffer > 0) {
1053 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1054 if (r < 0)
1055 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1056 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1057 }
1058
1059 if (s->send_buffer > 0) {
1060 r = fd_set_sndbuf(fd, s->send_buffer, false);
1061 if (r < 0)
1062 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1063 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1064 }
1065
1066 if (s->mark >= 0) {
1067 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1068 if (r < 0)
1069 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1070 }
1071
1072 if (s->ip_tos >= 0) {
1073 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1074 if (r < 0)
1075 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1076 }
1077
1078 if (s->ip_ttl >= 0) {
1079 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1080 if (r < 0)
1081 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1082 }
1083
1084 if (s->tcp_congestion)
1085 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1086 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1087
1088 if (s->smack_ip_in) {
1089 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1090 if (r < 0)
1091 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1092 }
1093
1094 if (s->smack_ip_out) {
1095 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1096 if (r < 0)
1097 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1098 }
1099 }
1100
1101 static void socket_apply_fifo_options(Socket *s, int fd) {
1102 int r;
1103
1104 assert(s);
1105 assert(fd >= 0);
1106
1107 if (s->pipe_size > 0)
1108 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1109 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1110
1111 if (s->smack) {
1112 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1113 if (r < 0)
1114 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1115 }
1116 }
1117
1118 static int fifo_address_create(
1119 const char *path,
1120 mode_t directory_mode,
1121 mode_t socket_mode) {
1122
1123 _cleanup_close_ int fd = -1;
1124 mode_t old_mask;
1125 struct stat st;
1126 int r;
1127
1128 assert(path);
1129
1130 (void) mkdir_parents_label(path, directory_mode);
1131
1132 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1133 if (r < 0)
1134 return r;
1135
1136 /* Enforce the right access mode for the fifo */
1137 old_mask = umask(~socket_mode);
1138
1139 /* Include the original umask in our mask */
1140 (void) umask(~socket_mode | old_mask);
1141
1142 r = mkfifo(path, socket_mode);
1143 (void) umask(old_mask);
1144
1145 if (r < 0 && errno != EEXIST) {
1146 r = -errno;
1147 goto fail;
1148 }
1149
1150 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1151 if (fd < 0) {
1152 r = -errno;
1153 goto fail;
1154 }
1155
1156 mac_selinux_create_file_clear();
1157
1158 if (fstat(fd, &st) < 0) {
1159 r = -errno;
1160 goto fail;
1161 }
1162
1163 if (!S_ISFIFO(st.st_mode) ||
1164 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1165 st.st_uid != getuid() ||
1166 st.st_gid != getgid()) {
1167 r = -EEXIST;
1168 goto fail;
1169 }
1170
1171 return TAKE_FD(fd);
1172
1173 fail:
1174 mac_selinux_create_file_clear();
1175 return r;
1176 }
1177
1178 static int special_address_create(const char *path, bool writable) {
1179 _cleanup_close_ int fd = -1;
1180 struct stat st;
1181
1182 assert(path);
1183
1184 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1185 if (fd < 0)
1186 return -errno;
1187
1188 if (fstat(fd, &st) < 0)
1189 return -errno;
1190
1191 /* Check whether this is a /proc, /sys or /dev file or char device */
1192 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1193 return -EEXIST;
1194
1195 return TAKE_FD(fd);
1196 }
1197
1198 static int usbffs_address_create(const char *path) {
1199 _cleanup_close_ int fd = -1;
1200 struct stat st;
1201
1202 assert(path);
1203
1204 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1205 if (fd < 0)
1206 return -errno;
1207
1208 if (fstat(fd, &st) < 0)
1209 return -errno;
1210
1211 /* Check whether this is a regular file (ffs endpoint) */
1212 if (!S_ISREG(st.st_mode))
1213 return -EEXIST;
1214
1215 return TAKE_FD(fd);
1216 }
1217
1218 static int mq_address_create(
1219 const char *path,
1220 mode_t mq_mode,
1221 long maxmsg,
1222 long msgsize) {
1223
1224 _cleanup_close_ int fd = -1;
1225 struct stat st;
1226 mode_t old_mask;
1227 struct mq_attr _attr, *attr = NULL;
1228
1229 assert(path);
1230
1231 if (maxmsg > 0 && msgsize > 0) {
1232 _attr = (struct mq_attr) {
1233 .mq_flags = O_NONBLOCK,
1234 .mq_maxmsg = maxmsg,
1235 .mq_msgsize = msgsize,
1236 };
1237 attr = &_attr;
1238 }
1239
1240 /* Enforce the right access mode for the mq */
1241 old_mask = umask(~mq_mode);
1242
1243 /* Include the original umask in our mask */
1244 (void) umask(~mq_mode | old_mask);
1245 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1246 (void) umask(old_mask);
1247
1248 if (fd < 0)
1249 return -errno;
1250
1251 if (fstat(fd, &st) < 0)
1252 return -errno;
1253
1254 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1255 st.st_uid != getuid() ||
1256 st.st_gid != getgid())
1257 return -EEXIST;
1258
1259 return TAKE_FD(fd);
1260 }
1261
1262 static int socket_symlink(Socket *s) {
1263 const char *p;
1264 int r;
1265
1266 assert(s);
1267
1268 p = socket_find_symlink_target(s);
1269 if (!p)
1270 return 0;
1271
1272 STRV_FOREACH(i, s->symlinks) {
1273 (void) mkdir_parents_label(*i, s->directory_mode);
1274
1275 r = symlink_idempotent(p, *i, false);
1276
1277 if (r == -EEXIST && s->remove_on_stop) {
1278 /* If there's already something where we want to create the symlink, and the destructive
1279 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1280 * again. */
1281
1282 if (unlink(*i) >= 0)
1283 r = symlink_idempotent(p, *i, false);
1284 }
1285
1286 if (r < 0)
1287 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1288 }
1289
1290 return 0;
1291 }
1292
1293 static int usbffs_write_descs(int fd, Service *s) {
1294 int r;
1295
1296 if (!s->usb_function_descriptors || !s->usb_function_strings)
1297 return -EINVAL;
1298
1299 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1300 if (r < 0)
1301 return r;
1302
1303 return copy_file_fd(s->usb_function_strings, fd, 0);
1304 }
1305
1306 static int usbffs_select_ep(const struct dirent *d) {
1307 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1308 }
1309
1310 static int usbffs_dispatch_eps(SocketPort *p) {
1311 _cleanup_free_ struct dirent **ent = NULL;
1312 size_t n, k;
1313 int r;
1314
1315 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1316 if (r < 0)
1317 return -errno;
1318
1319 n = (size_t) r;
1320 p->auxiliary_fds = new(int, n);
1321 if (!p->auxiliary_fds) {
1322 r = -ENOMEM;
1323 goto clear;
1324 }
1325
1326 p->n_auxiliary_fds = n;
1327
1328 k = 0;
1329 for (size_t i = 0; i < n; ++i) {
1330 _cleanup_free_ char *ep = NULL;
1331
1332 ep = path_make_absolute(ent[i]->d_name, p->path);
1333 if (!ep) {
1334 r = -ENOMEM;
1335 goto fail;
1336 }
1337
1338 path_simplify(ep);
1339
1340 r = usbffs_address_create(ep);
1341 if (r < 0)
1342 goto fail;
1343
1344 p->auxiliary_fds[k++] = r;
1345 }
1346
1347 r = 0;
1348 goto clear;
1349
1350 fail:
1351 close_many(p->auxiliary_fds, k);
1352 p->auxiliary_fds = mfree(p->auxiliary_fds);
1353 p->n_auxiliary_fds = 0;
1354
1355 clear:
1356 for (size_t i = 0; i < n; ++i)
1357 free(ent[i]);
1358
1359 return r;
1360 }
1361
1362 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1363 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1364 *
1365 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1366 * instance name.
1367 */
1368
1369 if (UNIT_ISSET(s->service)) {
1370 *ret = UNIT_DEREF(s->service);
1371 return 0;
1372 }
1373
1374 if (!s->accept)
1375 return -ENODATA;
1376
1377 /* Build the instance name and load the unit */
1378 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1379 int r;
1380
1381 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1382 if (r < 0)
1383 return r;
1384
1385 if (cfd >= 0) {
1386 r = instance_from_socket(cfd, s->n_accepted, &instance);
1387 if (ERRNO_IS_DISCONNECT(r))
1388 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1389 * different errors. This connection is over, but the socket unit lives on. */
1390 return log_unit_debug_errno(UNIT(s), r,
1391 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1392 errno_to_name(r));
1393 if (r < 0)
1394 return r;
1395 }
1396
1397 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1398 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1399 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1400 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1401 if (r < 0)
1402 return r;
1403
1404 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1405 }
1406
1407 static int socket_determine_selinux_label(Socket *s, char **ret) {
1408 int r;
1409
1410 assert(s);
1411 assert(ret);
1412
1413 if (s->selinux_context_from_net) {
1414 /* If this is requested, get the label from the network label */
1415
1416 r = mac_selinux_get_our_label(ret);
1417 if (r == -EOPNOTSUPP)
1418 goto no_label;
1419
1420 } else {
1421 /* Otherwise, get it from the executable we are about to start. */
1422
1423 Unit *service;
1424 ExecCommand *c;
1425 _cleanup_free_ char *path = NULL;
1426
1427 r = socket_load_service_unit(s, -1, &service);
1428 if (r == -ENODATA)
1429 goto no_label;
1430 if (r < 0)
1431 return r;
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 }
1445
1446 return r;
1447
1448 no_label:
1449 *ret = NULL;
1450 return 0;
1451 }
1452
1453 static int socket_address_listen_do(
1454 Socket *s,
1455 const SocketAddress *address,
1456 const char *label) {
1457
1458 assert(s);
1459 assert(address);
1460
1461 return socket_address_listen(
1462 address,
1463 SOCK_CLOEXEC|SOCK_NONBLOCK,
1464 s->backlog,
1465 s->bind_ipv6_only,
1466 s->bind_to_device,
1467 s->reuse_port,
1468 s->free_bind,
1469 s->transparent,
1470 s->directory_mode,
1471 s->socket_mode,
1472 label);
1473 }
1474
1475 #define log_address_error_errno(u, address, error, fmt) \
1476 ({ \
1477 _cleanup_free_ char *_t = NULL; \
1478 \
1479 (void) socket_address_print(address, &_t); \
1480 log_unit_error_errno(u, error, fmt, strna(_t)); \
1481 })
1482
1483 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1484 int r;
1485
1486 assert(address);
1487 assert(context);
1488
1489 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1490
1491 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1492 r = bpf_firewall_supported();
1493 if (r < 0)
1494 return r;
1495 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1496 return true;
1497 }
1498
1499 return context->private_network || context->network_namespace_path;
1500 }
1501
1502 static int socket_address_listen_in_cgroup(
1503 Socket *s,
1504 const SocketAddress *address,
1505 const char *label) {
1506
1507 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1508 int fd, r;
1509 pid_t pid;
1510
1511 assert(s);
1512 assert(address);
1513
1514 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1515 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1516 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1517 * such. */
1518
1519 r = fork_needed(address, &s->exec_context);
1520 if (r < 0)
1521 return r;
1522 if (r == 0) {
1523 /* Shortcut things... */
1524 fd = socket_address_listen_do(s, address, label);
1525 if (fd < 0)
1526 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1527
1528 return fd;
1529 }
1530
1531 r = unit_setup_exec_runtime(UNIT(s));
1532 if (r < 0)
1533 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1534
1535 if (s->exec_context.network_namespace_path &&
1536 s->exec_runtime &&
1537 s->exec_runtime->netns_storage_socket[0] >= 0) {
1538 r = open_shareable_ns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1539 if (r < 0)
1540 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1541 }
1542
1543 if (s->exec_context.ipc_namespace_path &&
1544 s->exec_runtime &&
1545 s->exec_runtime->ipcns_storage_socket[0] >= 0) {
1546 r = open_shareable_ns_path(s->exec_runtime->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1547 if (r < 0)
1548 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1549 }
1550
1551 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1552 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1553
1554 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1555 if (r < 0)
1556 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1557 if (r == 0) {
1558 /* Child */
1559
1560 pair[0] = safe_close(pair[0]);
1561
1562 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1563 s->exec_runtime &&
1564 s->exec_runtime->netns_storage_socket[0] >= 0) {
1565
1566 if (ns_type_supported(NAMESPACE_NET)) {
1567 r = setup_shareable_ns(s->exec_runtime->netns_storage_socket, CLONE_NEWNET);
1568 if (r < 0) {
1569 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1570 _exit(EXIT_NETWORK);
1571 }
1572 } else if (s->exec_context.network_namespace_path) {
1573 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1574 _exit(EXIT_NETWORK);
1575 } else
1576 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1577 }
1578
1579 fd = socket_address_listen_do(s, address, label);
1580 if (fd < 0) {
1581 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1582 _exit(EXIT_FAILURE);
1583 }
1584
1585 r = send_one_fd(pair[1], fd, 0);
1586 if (r < 0) {
1587 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1588 _exit(EXIT_FAILURE);
1589 }
1590
1591 _exit(EXIT_SUCCESS);
1592 }
1593
1594 pair[1] = safe_close(pair[1]);
1595 fd = receive_one_fd(pair[0], 0);
1596
1597 /* We synchronously wait for the helper, as it shouldn't be slow */
1598 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1599 if (r < 0) {
1600 safe_close(fd);
1601 return r;
1602 }
1603
1604 if (fd < 0)
1605 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1606
1607 return fd;
1608 }
1609
1610 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1611
1612 static int socket_open_fds(Socket *orig_s) {
1613 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1614 _cleanup_(mac_selinux_freep) char *label = NULL;
1615 bool know_label = false;
1616 int r;
1617
1618 assert(s);
1619
1620 LIST_FOREACH(port, p, s->ports) {
1621
1622 if (p->fd >= 0)
1623 continue;
1624
1625 switch (p->type) {
1626
1627 case SOCKET_SOCKET:
1628
1629 if (!know_label) {
1630 /* Figure out the label, if we don't it know yet. We do it once for the first
1631 * socket where we need this and remember it for the rest. */
1632
1633 r = socket_determine_selinux_label(s, &label);
1634 if (r < 0)
1635 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1636
1637 know_label = true;
1638 }
1639
1640 /* Apply the socket protocol */
1641 switch (p->address.type) {
1642
1643 case SOCK_STREAM:
1644 case SOCK_SEQPACKET:
1645 if (s->socket_protocol == IPPROTO_SCTP)
1646 p->address.protocol = s->socket_protocol;
1647 break;
1648
1649 case SOCK_DGRAM:
1650 if (s->socket_protocol == IPPROTO_UDPLITE)
1651 p->address.protocol = s->socket_protocol;
1652 break;
1653 }
1654
1655 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1656 if (p->fd < 0)
1657 return p->fd;
1658
1659 socket_apply_socket_options(s, p, p->fd);
1660 socket_symlink(s);
1661 break;
1662
1663 case SOCKET_SPECIAL:
1664
1665 p->fd = special_address_create(p->path, s->writable);
1666 if (p->fd < 0)
1667 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1668 break;
1669
1670 case SOCKET_FIFO:
1671
1672 p->fd = fifo_address_create(
1673 p->path,
1674 s->directory_mode,
1675 s->socket_mode);
1676 if (p->fd < 0)
1677 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1678
1679 socket_apply_fifo_options(s, p->fd);
1680 socket_symlink(s);
1681 break;
1682
1683 case SOCKET_MQUEUE:
1684
1685 p->fd = mq_address_create(
1686 p->path,
1687 s->socket_mode,
1688 s->mq_maxmsg,
1689 s->mq_msgsize);
1690 if (p->fd < 0)
1691 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1692 break;
1693
1694 case SOCKET_USB_FUNCTION: {
1695 _cleanup_free_ char *ep = NULL;
1696
1697 ep = path_make_absolute("ep0", p->path);
1698 if (!ep)
1699 return -ENOMEM;
1700
1701 p->fd = usbffs_address_create(ep);
1702 if (p->fd < 0)
1703 return p->fd;
1704
1705 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1706 if (r < 0)
1707 return r;
1708
1709 r = usbffs_dispatch_eps(p);
1710 if (r < 0)
1711 return r;
1712
1713 break;
1714 }
1715 default:
1716 assert_not_reached();
1717 }
1718 }
1719
1720 s = NULL;
1721 return 0;
1722 }
1723
1724 static void socket_unwatch_fds(Socket *s) {
1725 int r;
1726
1727 assert(s);
1728
1729 LIST_FOREACH(port, p, s->ports) {
1730 if (p->fd < 0)
1731 continue;
1732
1733 if (!p->event_source)
1734 continue;
1735
1736 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1737 if (r < 0)
1738 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1739 }
1740 }
1741
1742 static int socket_watch_fds(Socket *s) {
1743 int r;
1744
1745 assert(s);
1746
1747 LIST_FOREACH(port, p, s->ports) {
1748 if (p->fd < 0)
1749 continue;
1750
1751 if (p->event_source) {
1752 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1753 if (r < 0)
1754 goto fail;
1755 } else {
1756 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1757 if (r < 0)
1758 goto fail;
1759
1760 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1761 }
1762 }
1763
1764 return 0;
1765
1766 fail:
1767 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1768 socket_unwatch_fds(s);
1769 return r;
1770 }
1771
1772 enum {
1773 SOCKET_OPEN_NONE,
1774 SOCKET_OPEN_SOME,
1775 SOCKET_OPEN_ALL,
1776 };
1777
1778 static int socket_check_open(Socket *s) {
1779 bool have_open = false, have_closed = false;
1780
1781 assert(s);
1782
1783 LIST_FOREACH(port, p, s->ports) {
1784 if (p->fd < 0)
1785 have_closed = true;
1786 else
1787 have_open = true;
1788
1789 if (have_open && have_closed)
1790 return SOCKET_OPEN_SOME;
1791 }
1792
1793 if (have_open)
1794 return SOCKET_OPEN_ALL;
1795
1796 return SOCKET_OPEN_NONE;
1797 }
1798
1799 static void socket_set_state(Socket *s, SocketState state) {
1800 SocketState old_state;
1801 assert(s);
1802
1803 if (s->state != state)
1804 bus_unit_send_pending_change_signal(UNIT(s), false);
1805
1806 old_state = s->state;
1807 s->state = state;
1808
1809 if (!IN_SET(state,
1810 SOCKET_START_PRE,
1811 SOCKET_START_CHOWN,
1812 SOCKET_START_POST,
1813 SOCKET_STOP_PRE,
1814 SOCKET_STOP_PRE_SIGTERM,
1815 SOCKET_STOP_PRE_SIGKILL,
1816 SOCKET_STOP_POST,
1817 SOCKET_FINAL_SIGTERM,
1818 SOCKET_FINAL_SIGKILL,
1819 SOCKET_CLEANING)) {
1820
1821 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1822 socket_unwatch_control_pid(s);
1823 s->control_command = NULL;
1824 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1825 }
1826
1827 if (state != SOCKET_LISTENING)
1828 socket_unwatch_fds(s);
1829
1830 if (!IN_SET(state,
1831 SOCKET_START_CHOWN,
1832 SOCKET_START_POST,
1833 SOCKET_LISTENING,
1834 SOCKET_RUNNING,
1835 SOCKET_STOP_PRE,
1836 SOCKET_STOP_PRE_SIGTERM,
1837 SOCKET_STOP_PRE_SIGKILL,
1838 SOCKET_CLEANING))
1839 socket_close_fds(s);
1840
1841 if (state != old_state)
1842 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1843
1844 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1845 }
1846
1847 static int socket_coldplug(Unit *u) {
1848 Socket *s = SOCKET(u);
1849 int r;
1850
1851 assert(s);
1852 assert(s->state == SOCKET_DEAD);
1853
1854 if (s->deserialized_state == s->state)
1855 return 0;
1856
1857 if (s->control_pid > 0 &&
1858 pid_is_unwaited(s->control_pid) &&
1859 IN_SET(s->deserialized_state,
1860 SOCKET_START_PRE,
1861 SOCKET_START_CHOWN,
1862 SOCKET_START_POST,
1863 SOCKET_STOP_PRE,
1864 SOCKET_STOP_PRE_SIGTERM,
1865 SOCKET_STOP_PRE_SIGKILL,
1866 SOCKET_STOP_POST,
1867 SOCKET_FINAL_SIGTERM,
1868 SOCKET_FINAL_SIGKILL,
1869 SOCKET_CLEANING)) {
1870
1871 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1872 if (r < 0)
1873 return r;
1874
1875 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1876 if (r < 0)
1877 return r;
1878 }
1879
1880 if (IN_SET(s->deserialized_state,
1881 SOCKET_START_CHOWN,
1882 SOCKET_START_POST,
1883 SOCKET_LISTENING,
1884 SOCKET_RUNNING)) {
1885
1886 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1887 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1888 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1889 * and if there's a mismatch, warn loudly. */
1890
1891 r = socket_check_open(s);
1892 if (r == SOCKET_OPEN_NONE)
1893 log_unit_warning(UNIT(s),
1894 "Socket unit configuration has changed while unit has been running, "
1895 "no open socket file descriptor left. "
1896 "The socket unit is not functional until restarted.");
1897 else if (r == SOCKET_OPEN_SOME)
1898 log_unit_warning(UNIT(s),
1899 "Socket unit configuration has changed while unit has been running, "
1900 "and some socket file descriptors have not been opened yet. "
1901 "The socket unit is not fully functional until restarted.");
1902 }
1903
1904 if (s->deserialized_state == SOCKET_LISTENING) {
1905 r = socket_watch_fds(s);
1906 if (r < 0)
1907 return r;
1908 }
1909
1910 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1911 (void) unit_setup_dynamic_creds(u);
1912 (void) unit_setup_exec_runtime(u);
1913 }
1914
1915 socket_set_state(s, s->deserialized_state);
1916 return 0;
1917 }
1918
1919 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1920
1921 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1922 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1923 .stdin_fd = -1,
1924 .stdout_fd = -1,
1925 .stderr_fd = -1,
1926 .exec_fd = -1,
1927 };
1928 pid_t pid;
1929 int r;
1930
1931 assert(s);
1932 assert(c);
1933 assert(_pid);
1934
1935 r = unit_prepare_exec(UNIT(s));
1936 if (r < 0)
1937 return r;
1938
1939 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1940 if (r < 0)
1941 return r;
1942
1943 r = unit_set_exec_params(UNIT(s), &exec_params);
1944 if (r < 0)
1945 return r;
1946
1947 r = exec_spawn(UNIT(s),
1948 c,
1949 &s->exec_context,
1950 &exec_params,
1951 s->exec_runtime,
1952 &s->dynamic_creds,
1953 &pid);
1954 if (r < 0)
1955 return r;
1956
1957 r = unit_watch_pid(UNIT(s), pid, true);
1958 if (r < 0)
1959 return r;
1960
1961 *_pid = pid;
1962
1963 return 0;
1964 }
1965
1966 static int socket_chown(Socket *s, pid_t *_pid) {
1967 pid_t pid;
1968 int r;
1969
1970 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1971 if (r < 0)
1972 goto fail;
1973
1974 /* We have to resolve the user names out-of-process, hence
1975 * let's fork here. It's messy, but well, what can we do? */
1976
1977 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1978 if (r < 0)
1979 return r;
1980 if (r == 0) {
1981 uid_t uid = UID_INVALID;
1982 gid_t gid = GID_INVALID;
1983
1984 /* Child */
1985
1986 if (!isempty(s->user)) {
1987 const char *user = s->user;
1988
1989 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1990 if (r < 0) {
1991 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1992 _exit(EXIT_USER);
1993 }
1994 }
1995
1996 if (!isempty(s->group)) {
1997 const char *group = s->group;
1998
1999 r = get_group_creds(&group, &gid, 0);
2000 if (r < 0) {
2001 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2002 _exit(EXIT_GROUP);
2003 }
2004 }
2005
2006 LIST_FOREACH(port, p, s->ports) {
2007 const char *path = NULL;
2008
2009 if (p->type == SOCKET_SOCKET)
2010 path = socket_address_get_path(&p->address);
2011 else if (p->type == SOCKET_FIFO)
2012 path = p->path;
2013
2014 if (!path)
2015 continue;
2016
2017 if (chown(path, uid, gid) < 0) {
2018 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2019 _exit(EXIT_CHOWN);
2020 }
2021 }
2022
2023 _exit(EXIT_SUCCESS);
2024 }
2025
2026 r = unit_watch_pid(UNIT(s), pid, true);
2027 if (r < 0)
2028 goto fail;
2029
2030 *_pid = pid;
2031 return 0;
2032
2033 fail:
2034 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2035 return r;
2036 }
2037
2038 static void socket_enter_dead(Socket *s, SocketResult f) {
2039 assert(s);
2040
2041 if (s->result == SOCKET_SUCCESS)
2042 s->result = f;
2043
2044 if (s->result == SOCKET_SUCCESS)
2045 unit_log_success(UNIT(s));
2046 else
2047 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2048
2049 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2050
2051 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2052
2053 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2054
2055 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2056
2057 unit_unref_uid_gid(UNIT(s), true);
2058
2059 dynamic_creds_destroy(&s->dynamic_creds);
2060 }
2061
2062 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2063
2064 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2065 int r;
2066 assert(s);
2067
2068 if (s->result == SOCKET_SUCCESS)
2069 s->result = f;
2070
2071 socket_unwatch_control_pid(s);
2072 s->control_command_id = SOCKET_EXEC_STOP_POST;
2073 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2074
2075 if (s->control_command) {
2076 r = socket_spawn(s, s->control_command, &s->control_pid);
2077 if (r < 0)
2078 goto fail;
2079
2080 socket_set_state(s, SOCKET_STOP_POST);
2081 } else
2082 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2083
2084 return;
2085
2086 fail:
2087 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2088 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2089 }
2090
2091 static int state_to_kill_operation(Socket *s, SocketState state) {
2092 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2093 return KILL_RESTART;
2094
2095 if (state == SOCKET_FINAL_SIGTERM)
2096 return KILL_TERMINATE;
2097
2098 return KILL_KILL;
2099 }
2100
2101 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2102 int r;
2103
2104 assert(s);
2105
2106 if (s->result == SOCKET_SUCCESS)
2107 s->result = f;
2108
2109 r = unit_kill_context(
2110 UNIT(s),
2111 &s->kill_context,
2112 state_to_kill_operation(s, state),
2113 -1,
2114 s->control_pid,
2115 false);
2116 if (r < 0)
2117 goto fail;
2118
2119 if (r > 0) {
2120 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2121 if (r < 0)
2122 goto fail;
2123
2124 socket_set_state(s, state);
2125 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2126 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2127 else if (state == SOCKET_STOP_PRE_SIGKILL)
2128 socket_enter_stop_post(s, SOCKET_SUCCESS);
2129 else if (state == SOCKET_FINAL_SIGTERM)
2130 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2131 else
2132 socket_enter_dead(s, SOCKET_SUCCESS);
2133
2134 return;
2135
2136 fail:
2137 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2138
2139 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2140 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2141 else
2142 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2143 }
2144
2145 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2146 int r;
2147 assert(s);
2148
2149 if (s->result == SOCKET_SUCCESS)
2150 s->result = f;
2151
2152 socket_unwatch_control_pid(s);
2153 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2154 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2155
2156 if (s->control_command) {
2157 r = socket_spawn(s, s->control_command, &s->control_pid);
2158 if (r < 0)
2159 goto fail;
2160
2161 socket_set_state(s, SOCKET_STOP_PRE);
2162 } else
2163 socket_enter_stop_post(s, SOCKET_SUCCESS);
2164
2165 return;
2166
2167 fail:
2168 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2169 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2170 }
2171
2172 static void socket_enter_listening(Socket *s) {
2173 int r;
2174 assert(s);
2175
2176 if (!s->accept && s->flush_pending) {
2177 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2178 flush_ports(s);
2179 }
2180
2181 r = socket_watch_fds(s);
2182 if (r < 0) {
2183 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2184 goto fail;
2185 }
2186
2187 socket_set_state(s, SOCKET_LISTENING);
2188 return;
2189
2190 fail:
2191 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2192 }
2193
2194 static void socket_enter_start_post(Socket *s) {
2195 int r;
2196 assert(s);
2197
2198 socket_unwatch_control_pid(s);
2199 s->control_command_id = SOCKET_EXEC_START_POST;
2200 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2201
2202 if (s->control_command) {
2203 r = socket_spawn(s, s->control_command, &s->control_pid);
2204 if (r < 0) {
2205 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2206 goto fail;
2207 }
2208
2209 socket_set_state(s, SOCKET_START_POST);
2210 } else
2211 socket_enter_listening(s);
2212
2213 return;
2214
2215 fail:
2216 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2217 }
2218
2219 static void socket_enter_start_chown(Socket *s) {
2220 int r;
2221
2222 assert(s);
2223
2224 r = socket_open_fds(s);
2225 if (r < 0) {
2226 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2227 goto fail;
2228 }
2229
2230 if (!isempty(s->user) || !isempty(s->group)) {
2231
2232 socket_unwatch_control_pid(s);
2233 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2234 s->control_command = NULL;
2235
2236 r = socket_chown(s, &s->control_pid);
2237 if (r < 0) {
2238 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2239 goto fail;
2240 }
2241
2242 socket_set_state(s, SOCKET_START_CHOWN);
2243 } else
2244 socket_enter_start_post(s);
2245
2246 return;
2247
2248 fail:
2249 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2250 }
2251
2252 static void socket_enter_start_pre(Socket *s) {
2253 int r;
2254 assert(s);
2255
2256 socket_unwatch_control_pid(s);
2257
2258 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2259
2260 s->control_command_id = SOCKET_EXEC_START_PRE;
2261 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2262
2263 if (s->control_command) {
2264 r = socket_spawn(s, s->control_command, &s->control_pid);
2265 if (r < 0) {
2266 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2267 goto fail;
2268 }
2269
2270 socket_set_state(s, SOCKET_START_PRE);
2271 } else
2272 socket_enter_start_chown(s);
2273
2274 return;
2275
2276 fail:
2277 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2278 }
2279
2280 static void flush_ports(Socket *s) {
2281 assert(s);
2282
2283 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2284 * anymore */
2285
2286 LIST_FOREACH(port, p, s->ports) {
2287 if (p->fd < 0)
2288 continue;
2289
2290 (void) flush_accept(p->fd);
2291 (void) flush_fd(p->fd);
2292 }
2293 }
2294
2295 static void socket_enter_running(Socket *s, int cfd_in) {
2296 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2297 * somewhere or close it. */
2298 _cleanup_close_ int cfd = cfd_in;
2299
2300 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2301 int r;
2302
2303 assert(s);
2304
2305 /* We don't take connections anymore if we are supposed to shut down anyway */
2306 if (unit_stop_pending(UNIT(s))) {
2307
2308 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2309
2310 if (cfd >= 0)
2311 goto refuse;
2312
2313 flush_ports(s);
2314 return;
2315 }
2316
2317 if (!ratelimit_below(&s->trigger_limit)) {
2318 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2319 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2320 goto refuse;
2321 }
2322
2323 if (cfd < 0) {
2324 bool pending = false;
2325 Unit *other;
2326
2327 /* If there's already a start pending don't bother to do anything */
2328 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2329 if (unit_active_or_pending(other)) {
2330 pending = true;
2331 break;
2332 }
2333
2334 if (!pending) {
2335 if (!UNIT_ISSET(s->service)) {
2336 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2337 "Service to activate vanished, refusing activation.");
2338 goto fail;
2339 }
2340
2341 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2342 if (r < 0)
2343 goto fail;
2344 }
2345
2346 socket_set_state(s, SOCKET_RUNNING);
2347 } else {
2348 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2349 Unit *service;
2350
2351 if (s->n_connections >= s->max_connections) {
2352 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2353 s->n_connections);
2354 goto refuse;
2355 }
2356
2357 if (s->max_connections_per_source > 0) {
2358 r = socket_acquire_peer(s, cfd, &p);
2359 if (ERRNO_IS_DISCONNECT(r))
2360 return;
2361 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2362 goto fail;
2363 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2364 _cleanup_free_ char *t = NULL;
2365
2366 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2367
2368 log_unit_warning(UNIT(s),
2369 "Too many incoming connections (%u) from source %s, dropping connection.",
2370 p->n_ref, strnull(t));
2371 goto refuse;
2372 }
2373 }
2374
2375 r = socket_load_service_unit(s, cfd, &service);
2376 if (ERRNO_IS_DISCONNECT(r))
2377 return;
2378 if (r < 0)
2379 goto fail;
2380
2381 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2382 false, UNIT_DEPENDENCY_IMPLICIT);
2383 if (r < 0)
2384 goto fail;
2385
2386 s->n_accepted++;
2387
2388 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2389 if (ERRNO_IS_DISCONNECT(r))
2390 return;
2391 if (r < 0)
2392 goto fail;
2393
2394 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2395 s->n_connections++;
2396
2397 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2398 if (r < 0) {
2399 /* We failed to activate the new service, but it still exists. Let's make sure the
2400 * service closes and forgets the connection fd again, immediately. */
2401 service_close_socket_fd(SERVICE(service));
2402 goto fail;
2403 }
2404
2405 /* Notify clients about changed counters */
2406 unit_add_to_dbus_queue(UNIT(s));
2407 }
2408
2409 TAKE_FD(cfd);
2410 return;
2411
2412 refuse:
2413 s->n_refused++;
2414 return;
2415
2416 fail:
2417 if (ERRNO_IS_RESOURCE(r))
2418 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2419 bus_error_message(&error, r));
2420 else
2421 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2422 cfd >= 0 ? "template" : "non-template",
2423 bus_error_message(&error, r));
2424
2425 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2426 }
2427
2428 static void socket_run_next(Socket *s) {
2429 int r;
2430
2431 assert(s);
2432 assert(s->control_command);
2433 assert(s->control_command->command_next);
2434
2435 socket_unwatch_control_pid(s);
2436
2437 s->control_command = s->control_command->command_next;
2438
2439 r = socket_spawn(s, s->control_command, &s->control_pid);
2440 if (r < 0)
2441 goto fail;
2442
2443 return;
2444
2445 fail:
2446 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2447
2448 if (s->state == SOCKET_START_POST)
2449 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2450 else if (s->state == SOCKET_STOP_POST)
2451 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2452 else
2453 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2454 }
2455
2456 static int socket_start(Unit *u) {
2457 Socket *s = SOCKET(u);
2458 int r;
2459
2460 assert(s);
2461
2462 /* We cannot fulfill this request right now, try again later
2463 * please! */
2464 if (IN_SET(s->state,
2465 SOCKET_STOP_PRE,
2466 SOCKET_STOP_PRE_SIGKILL,
2467 SOCKET_STOP_PRE_SIGTERM,
2468 SOCKET_STOP_POST,
2469 SOCKET_FINAL_SIGTERM,
2470 SOCKET_FINAL_SIGKILL,
2471 SOCKET_CLEANING))
2472 return -EAGAIN;
2473
2474 /* Already on it! */
2475 if (IN_SET(s->state,
2476 SOCKET_START_PRE,
2477 SOCKET_START_CHOWN,
2478 SOCKET_START_POST))
2479 return 0;
2480
2481 /* Cannot run this without the service being around */
2482 if (UNIT_ISSET(s->service)) {
2483 Service *service;
2484
2485 service = SERVICE(UNIT_DEREF(s->service));
2486
2487 if (UNIT(service)->load_state != UNIT_LOADED)
2488 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2489
2490 /* If the service is already active we cannot start the
2491 * socket */
2492 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
2493 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2494 }
2495
2496 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2497
2498 r = unit_acquire_invocation_id(u);
2499 if (r < 0)
2500 return r;
2501
2502 s->result = SOCKET_SUCCESS;
2503 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2504
2505 u->reset_accounting = true;
2506
2507 socket_enter_start_pre(s);
2508 return 1;
2509 }
2510
2511 static int socket_stop(Unit *u) {
2512 Socket *s = SOCKET(u);
2513
2514 assert(s);
2515
2516 /* Already on it */
2517 if (IN_SET(s->state,
2518 SOCKET_STOP_PRE,
2519 SOCKET_STOP_PRE_SIGTERM,
2520 SOCKET_STOP_PRE_SIGKILL,
2521 SOCKET_STOP_POST,
2522 SOCKET_FINAL_SIGTERM,
2523 SOCKET_FINAL_SIGKILL))
2524 return 0;
2525
2526 /* If there's already something running we go directly into
2527 * kill mode. */
2528 if (IN_SET(s->state,
2529 SOCKET_START_PRE,
2530 SOCKET_START_CHOWN,
2531 SOCKET_START_POST)) {
2532 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2533 return -EAGAIN;
2534 }
2535
2536 /* If we are currently cleaning, then abort it, brutally. */
2537 if (s->state == SOCKET_CLEANING) {
2538 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2539 return 0;
2540 }
2541
2542 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2543
2544 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2545 return 1;
2546 }
2547
2548 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2549 Socket *s = SOCKET(u);
2550 int r;
2551
2552 assert(u);
2553 assert(f);
2554 assert(fds);
2555
2556 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2557 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2558 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2559 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2560
2561 if (s->control_pid > 0)
2562 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2563
2564 if (s->control_command_id >= 0)
2565 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2566
2567 LIST_FOREACH(port, p, s->ports) {
2568 int copy;
2569
2570 if (p->fd < 0)
2571 continue;
2572
2573 copy = fdset_put_dup(fds, p->fd);
2574 if (copy < 0)
2575 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2576
2577 if (p->type == SOCKET_SOCKET) {
2578 _cleanup_free_ char *t = NULL;
2579
2580 r = socket_address_print(&p->address, &t);
2581 if (r < 0)
2582 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2583
2584 if (socket_address_family(&p->address) == AF_NETLINK)
2585 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2586 else
2587 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2588 } else if (p->type == SOCKET_SPECIAL)
2589 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2590 else if (p->type == SOCKET_MQUEUE)
2591 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2592 else if (p->type == SOCKET_USB_FUNCTION)
2593 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2594 else {
2595 assert(p->type == SOCKET_FIFO);
2596 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2597 }
2598 }
2599
2600 return 0;
2601 }
2602
2603 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2604 Socket *s = SOCKET(u);
2605
2606 assert(u);
2607 assert(key);
2608 assert(value);
2609
2610 if (streq(key, "state")) {
2611 SocketState state;
2612
2613 state = socket_state_from_string(value);
2614 if (state < 0)
2615 log_unit_debug(u, "Failed to parse state value: %s", value);
2616 else
2617 s->deserialized_state = state;
2618 } else if (streq(key, "result")) {
2619 SocketResult f;
2620
2621 f = socket_result_from_string(value);
2622 if (f < 0)
2623 log_unit_debug(u, "Failed to parse result value: %s", value);
2624 else if (f != SOCKET_SUCCESS)
2625 s->result = f;
2626
2627 } else if (streq(key, "n-accepted")) {
2628 unsigned k;
2629
2630 if (safe_atou(value, &k) < 0)
2631 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2632 else
2633 s->n_accepted += k;
2634 } else if (streq(key, "n-refused")) {
2635 unsigned k;
2636
2637 if (safe_atou(value, &k) < 0)
2638 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2639 else
2640 s->n_refused += k;
2641 } else if (streq(key, "control-pid")) {
2642 pid_t pid;
2643
2644 if (parse_pid(value, &pid) < 0)
2645 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2646 else
2647 s->control_pid = pid;
2648 } else if (streq(key, "control-command")) {
2649 SocketExecCommand id;
2650
2651 id = socket_exec_command_from_string(value);
2652 if (id < 0)
2653 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2654 else {
2655 s->control_command_id = id;
2656 s->control_command = s->exec_command[id];
2657 }
2658 } else if (streq(key, "fifo")) {
2659 int fd, skip = 0;
2660
2661 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2662 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2663 else {
2664 bool found = false;
2665
2666 LIST_FOREACH(port, p, s->ports)
2667 if (p->fd < 0 &&
2668 p->type == SOCKET_FIFO &&
2669 path_equal_or_files_same(p->path, value+skip, 0)) {
2670 p->fd = fdset_remove(fds, fd);
2671 found = true;
2672 break;
2673 }
2674 if (!found)
2675 log_unit_debug(u, "No matching fifo socket found: %s", value+skip);
2676 }
2677
2678 } else if (streq(key, "special")) {
2679 int fd, skip = 0;
2680
2681 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2682 log_unit_debug(u, "Failed to parse special value: %s", value);
2683 else {
2684 bool found = false;
2685
2686 LIST_FOREACH(port, p, s->ports)
2687 if (p->fd < 0 &&
2688 p->type == SOCKET_SPECIAL &&
2689 path_equal_or_files_same(p->path, value+skip, 0)) {
2690 p->fd = fdset_remove(fds, fd);
2691 found = true;
2692 break;
2693 }
2694 if (!found)
2695 log_unit_debug(u, "No matching special socket found: %s", value+skip);
2696 }
2697
2698 } else if (streq(key, "mqueue")) {
2699 int fd, skip = 0;
2700
2701 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2702 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2703 else {
2704 bool found = false;
2705
2706 LIST_FOREACH(port, p, s->ports)
2707 if (p->fd < 0 &&
2708 p->type == SOCKET_MQUEUE &&
2709 streq(p->path, value+skip)) {
2710 p->fd = fdset_remove(fds, fd);
2711 found = true;
2712 break;
2713 }
2714 if (!found)
2715 log_unit_debug(u, "No matching mqueue socket found: %s", value+skip);
2716 }
2717
2718 } else if (streq(key, "socket")) {
2719 int fd, type, skip = 0;
2720
2721 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2722 log_unit_debug(u, "Failed to parse socket value: %s", value);
2723 else {
2724 bool found = false;
2725
2726 LIST_FOREACH(port, p, s->ports)
2727 if (p->fd < 0 &&
2728 socket_address_is(&p->address, value+skip, type)) {
2729 p->fd = fdset_remove(fds, fd);
2730 found = true;
2731 break;
2732 }
2733 if (!found)
2734 log_unit_debug(u, "No matching %s socket found: %s",
2735 socket_address_type_to_string(type), value+skip);
2736 }
2737
2738 } else if (streq(key, "netlink")) {
2739 int fd, skip = 0;
2740
2741 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2742 log_unit_debug(u, "Failed to parse socket value: %s", value);
2743 else {
2744 bool found = false;
2745
2746 LIST_FOREACH(port, p, s->ports)
2747 if (p->fd < 0 &&
2748 socket_address_is_netlink(&p->address, value+skip)) {
2749 p->fd = fdset_remove(fds, fd);
2750 found = true;
2751 break;
2752 }
2753 if (!found)
2754 log_unit_debug(u, "No matching netlink socket found: %s", value+skip);
2755 }
2756
2757 } else if (streq(key, "ffs")) {
2758 int fd, skip = 0;
2759
2760 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2761 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2762 else {
2763 bool found = false;
2764
2765 LIST_FOREACH(port, p, s->ports)
2766 if (p->fd < 0 &&
2767 p->type == SOCKET_USB_FUNCTION &&
2768 path_equal_or_files_same(p->path, value+skip, 0)) {
2769 p->fd = fdset_remove(fds, fd);
2770 found = true;
2771 break;
2772 }
2773 if (!found)
2774 log_unit_debug(u, "No matching ffs socket found: %s", value+skip);
2775 }
2776
2777 } else
2778 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2779
2780 return 0;
2781 }
2782
2783 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2784 Socket *s = SOCKET(u);
2785
2786 assert(u);
2787
2788 LIST_FOREACH(port, p, s->ports) {
2789 int fd;
2790
2791 if (p->type != SOCKET_SOCKET)
2792 continue;
2793
2794 if (p->fd >= 0)
2795 continue;
2796
2797 FDSET_FOREACH(fd, fds) {
2798 if (socket_address_matches_fd(&p->address, fd)) {
2799 p->fd = fdset_remove(fds, fd);
2800 s->deserialized_state = SOCKET_LISTENING;
2801 break;
2802 }
2803 }
2804 }
2805 }
2806
2807 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2808 assert(u);
2809
2810 return state_translation_table[SOCKET(u)->state];
2811 }
2812
2813 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2814 assert(u);
2815
2816 return socket_state_to_string(SOCKET(u)->state);
2817 }
2818
2819 const char* socket_port_type_to_string(SocketPort *p) {
2820
2821 assert(p);
2822
2823 switch (p->type) {
2824
2825 case SOCKET_SOCKET:
2826
2827 switch (p->address.type) {
2828
2829 case SOCK_STREAM:
2830 return "Stream";
2831
2832 case SOCK_DGRAM:
2833 return "Datagram";
2834
2835 case SOCK_SEQPACKET:
2836 return "SequentialPacket";
2837
2838 case SOCK_RAW:
2839 if (socket_address_family(&p->address) == AF_NETLINK)
2840 return "Netlink";
2841
2842 _fallthrough_;
2843 default:
2844 return NULL;
2845 }
2846
2847 case SOCKET_SPECIAL:
2848 return "Special";
2849
2850 case SOCKET_MQUEUE:
2851 return "MessageQueue";
2852
2853 case SOCKET_FIFO:
2854 return "FIFO";
2855
2856 case SOCKET_USB_FUNCTION:
2857 return "USBFunction";
2858
2859 default:
2860 return NULL;
2861 }
2862 }
2863
2864 SocketType socket_port_type_from_string(const char *s) {
2865 assert(s);
2866
2867 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2868 return SOCKET_SOCKET;
2869 else if (streq(s, "Special"))
2870 return SOCKET_SPECIAL;
2871 else if (streq(s, "MessageQueue"))
2872 return SOCKET_MQUEUE;
2873 else if (streq(s, "FIFO"))
2874 return SOCKET_FIFO;
2875 else if (streq(s, "USBFunction"))
2876 return SOCKET_USB_FUNCTION;
2877 else
2878 return _SOCKET_TYPE_INVALID;
2879 }
2880
2881 _pure_ static bool socket_may_gc(Unit *u) {
2882 Socket *s = SOCKET(u);
2883
2884 assert(u);
2885
2886 return s->n_connections == 0;
2887 }
2888
2889 static int socket_accept_do(Socket *s, int fd) {
2890 int cfd;
2891
2892 assert(s);
2893 assert(fd >= 0);
2894
2895 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2896 if (cfd < 0)
2897 /* Convert transient network errors into clean and well-defined EAGAIN */
2898 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2899
2900 return cfd;
2901 }
2902
2903 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2904 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2905 int cfd, r;
2906 pid_t pid;
2907
2908 assert(s);
2909 assert(p);
2910 assert(fd >= 0);
2911
2912 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2913 * connection socket is also properly associated with the cgroup. */
2914
2915 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2916 goto shortcut;
2917
2918 r = bpf_firewall_supported();
2919 if (r < 0)
2920 return r;
2921 if (r == BPF_FIREWALL_UNSUPPORTED)
2922 goto shortcut;
2923
2924 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2925 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2926
2927 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2928 if (r < 0)
2929 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2930 if (r == 0) {
2931 /* Child */
2932
2933 pair[0] = safe_close(pair[0]);
2934
2935 cfd = socket_accept_do(s, fd);
2936 if (cfd == -EAGAIN) /* spurious accept() */
2937 _exit(EXIT_SUCCESS);
2938 if (cfd < 0) {
2939 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2940 _exit(EXIT_FAILURE);
2941 }
2942
2943 r = send_one_fd(pair[1], cfd, 0);
2944 if (r < 0) {
2945 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2946 _exit(EXIT_FAILURE);
2947 }
2948
2949 _exit(EXIT_SUCCESS);
2950 }
2951
2952 pair[1] = safe_close(pair[1]);
2953 cfd = receive_one_fd(pair[0], 0);
2954
2955 /* We synchronously wait for the helper, as it shouldn't be slow */
2956 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2957 if (r < 0) {
2958 safe_close(cfd);
2959 return r;
2960 }
2961
2962 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2963 * this is a spurious accept(), let's convert that back to EAGAIN here. */
2964 if (cfd == -EIO)
2965 return -EAGAIN;
2966 if (cfd < 0)
2967 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2968
2969 return cfd;
2970
2971 shortcut:
2972 cfd = socket_accept_do(s, fd);
2973 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
2974 return -EAGAIN;
2975 if (cfd < 0)
2976 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2977
2978 return cfd;
2979 }
2980
2981 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2982 SocketPort *p = userdata;
2983 int cfd = -1;
2984
2985 assert(p);
2986 assert(fd >= 0);
2987
2988 if (p->socket->state != SOCKET_LISTENING)
2989 return 0;
2990
2991 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2992
2993 if (revents != EPOLLIN) {
2994 if (revents & EPOLLHUP)
2995 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.");
2996 else
2997 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2998 goto fail;
2999 }
3000
3001 if (p->socket->accept &&
3002 p->type == SOCKET_SOCKET &&
3003 socket_address_can_accept(&p->address)) {
3004
3005 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3006 if (cfd == -EAGAIN) /* Spurious accept() */
3007 return 0;
3008 if (cfd < 0)
3009 goto fail;
3010
3011 socket_apply_socket_options(p->socket, p, cfd);
3012 }
3013
3014 socket_enter_running(p->socket, cfd);
3015 return 0;
3016
3017 fail:
3018 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3019 return 0;
3020 }
3021
3022 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3023 Socket *s = SOCKET(u);
3024 SocketResult f;
3025
3026 assert(s);
3027 assert(pid >= 0);
3028
3029 if (pid != s->control_pid)
3030 return;
3031
3032 s->control_pid = 0;
3033
3034 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3035 f = SOCKET_SUCCESS;
3036 else if (code == CLD_EXITED)
3037 f = SOCKET_FAILURE_EXIT_CODE;
3038 else if (code == CLD_KILLED)
3039 f = SOCKET_FAILURE_SIGNAL;
3040 else if (code == CLD_DUMPED)
3041 f = SOCKET_FAILURE_CORE_DUMP;
3042 else
3043 assert_not_reached();
3044
3045 if (s->control_command) {
3046 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3047
3048 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3049 f = SOCKET_SUCCESS;
3050 }
3051
3052 unit_log_process_exit(
3053 u,
3054 "Control process",
3055 socket_exec_command_to_string(s->control_command_id),
3056 f == SOCKET_SUCCESS,
3057 code, status);
3058
3059 if (s->result == SOCKET_SUCCESS)
3060 s->result = f;
3061
3062 if (s->control_command &&
3063 s->control_command->command_next &&
3064 f == SOCKET_SUCCESS) {
3065
3066 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3067 socket_run_next(s);
3068 } else {
3069 s->control_command = NULL;
3070 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3071
3072 /* No further commands for this step, so let's figure
3073 * out what to do next */
3074
3075 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3076
3077 switch (s->state) {
3078
3079 case SOCKET_START_PRE:
3080 if (f == SOCKET_SUCCESS)
3081 socket_enter_start_chown(s);
3082 else
3083 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3084 break;
3085
3086 case SOCKET_START_CHOWN:
3087 if (f == SOCKET_SUCCESS)
3088 socket_enter_start_post(s);
3089 else
3090 socket_enter_stop_pre(s, f);
3091 break;
3092
3093 case SOCKET_START_POST:
3094 if (f == SOCKET_SUCCESS)
3095 socket_enter_listening(s);
3096 else
3097 socket_enter_stop_pre(s, f);
3098 break;
3099
3100 case SOCKET_STOP_PRE:
3101 case SOCKET_STOP_PRE_SIGTERM:
3102 case SOCKET_STOP_PRE_SIGKILL:
3103 socket_enter_stop_post(s, f);
3104 break;
3105
3106 case SOCKET_STOP_POST:
3107 case SOCKET_FINAL_SIGTERM:
3108 case SOCKET_FINAL_SIGKILL:
3109 socket_enter_dead(s, f);
3110 break;
3111
3112 case SOCKET_CLEANING:
3113
3114 if (s->clean_result == SOCKET_SUCCESS)
3115 s->clean_result = f;
3116
3117 socket_enter_dead(s, SOCKET_SUCCESS);
3118 break;
3119
3120 default:
3121 assert_not_reached();
3122 }
3123 }
3124
3125 /* Notify clients about changed exit status */
3126 unit_add_to_dbus_queue(u);
3127 }
3128
3129 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3130 Socket *s = SOCKET(userdata);
3131
3132 assert(s);
3133 assert(s->timer_event_source == source);
3134
3135 switch (s->state) {
3136
3137 case SOCKET_START_PRE:
3138 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3139 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3140 break;
3141
3142 case SOCKET_START_CHOWN:
3143 case SOCKET_START_POST:
3144 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3145 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3146 break;
3147
3148 case SOCKET_STOP_PRE:
3149 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3150 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3151 break;
3152
3153 case SOCKET_STOP_PRE_SIGTERM:
3154 if (s->kill_context.send_sigkill) {
3155 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3156 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3157 } else {
3158 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3159 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3160 }
3161 break;
3162
3163 case SOCKET_STOP_PRE_SIGKILL:
3164 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3165 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3166 break;
3167
3168 case SOCKET_STOP_POST:
3169 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3170 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3171 break;
3172
3173 case SOCKET_FINAL_SIGTERM:
3174 if (s->kill_context.send_sigkill) {
3175 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3176 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3177 } else {
3178 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3179 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3180 }
3181 break;
3182
3183 case SOCKET_FINAL_SIGKILL:
3184 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3185 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3186 break;
3187
3188 case SOCKET_CLEANING:
3189 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3190
3191 if (s->clean_result == SOCKET_SUCCESS)
3192 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3193
3194 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3195 break;
3196
3197 default:
3198 assert_not_reached();
3199 }
3200
3201 return 0;
3202 }
3203
3204 int socket_collect_fds(Socket *s, int **fds) {
3205 size_t k = 0, n = 0;
3206 int *rfds;
3207
3208 assert(s);
3209 assert(fds);
3210
3211 /* Called from the service code for requesting our fds */
3212
3213 LIST_FOREACH(port, p, s->ports) {
3214 if (p->fd >= 0)
3215 n++;
3216 n += p->n_auxiliary_fds;
3217 }
3218
3219 if (n <= 0) {
3220 *fds = NULL;
3221 return 0;
3222 }
3223
3224 rfds = new(int, n);
3225 if (!rfds)
3226 return -ENOMEM;
3227
3228 LIST_FOREACH(port, p, s->ports) {
3229 if (p->fd >= 0)
3230 rfds[k++] = p->fd;
3231 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3232 rfds[k++] = p->auxiliary_fds[i];
3233 }
3234
3235 assert(k == n);
3236
3237 *fds = rfds;
3238 return (int) n;
3239 }
3240
3241 static void socket_reset_failed(Unit *u) {
3242 Socket *s = SOCKET(u);
3243
3244 assert(s);
3245
3246 if (s->state == SOCKET_FAILED)
3247 socket_set_state(s, SOCKET_DEAD);
3248
3249 s->result = SOCKET_SUCCESS;
3250 s->clean_result = SOCKET_SUCCESS;
3251 }
3252
3253 void socket_connection_unref(Socket *s) {
3254 assert(s);
3255
3256 /* The service is dead. Yay!
3257 *
3258 * This is strictly for one-instance-per-connection
3259 * services. */
3260
3261 assert(s->n_connections > 0);
3262 s->n_connections--;
3263
3264 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3265 }
3266
3267 static void socket_trigger_notify(Unit *u, Unit *other) {
3268 Socket *s = SOCKET(u);
3269
3270 assert(u);
3271 assert(other);
3272
3273 /* Filter out invocations with bogus state */
3274 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3275 assert(other->type == UNIT_SERVICE);
3276
3277 /* Don't propagate state changes from the service if we are already down */
3278 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3279 return;
3280
3281 /* We don't care for the service state if we are in Accept=yes mode */
3282 if (s->accept)
3283 return;
3284
3285 /* Propagate start limit hit state */
3286 if (other->start_limit_hit) {
3287 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3288 return;
3289 }
3290
3291 /* Don't propagate anything if there's still a job queued */
3292 if (other->job)
3293 return;
3294
3295 if (IN_SET(SERVICE(other)->state,
3296 SERVICE_DEAD, SERVICE_FAILED,
3297 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3298 SERVICE_AUTO_RESTART))
3299 socket_enter_listening(s);
3300
3301 if (SERVICE(other)->state == SERVICE_RUNNING)
3302 socket_set_state(s, SOCKET_RUNNING);
3303 }
3304
3305 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3306 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3307 }
3308
3309 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3310 Socket *s = SOCKET(u);
3311 usec_t t;
3312 int r;
3313
3314 if (!s->timer_event_source)
3315 return 0;
3316
3317 r = sd_event_source_get_time(s->timer_event_source, &t);
3318 if (r < 0)
3319 return r;
3320 if (t == USEC_INFINITY)
3321 return 0;
3322
3323 *timeout = t;
3324 return 1;
3325 }
3326
3327 char *socket_fdname(Socket *s) {
3328 assert(s);
3329
3330 /* Returns the name to use for $LISTEN_NAMES. If the user
3331 * didn't specify anything specifically, use the socket unit's
3332 * name as fallback. */
3333
3334 return s->fdname ?: UNIT(s)->id;
3335 }
3336
3337 static int socket_control_pid(Unit *u) {
3338 Socket *s = SOCKET(u);
3339
3340 assert(s);
3341
3342 return s->control_pid;
3343 }
3344
3345 static int socket_clean(Unit *u, ExecCleanMask mask) {
3346 _cleanup_strv_free_ char **l = NULL;
3347 Socket *s = SOCKET(u);
3348 int r;
3349
3350 assert(s);
3351 assert(mask != 0);
3352
3353 if (s->state != SOCKET_DEAD)
3354 return -EBUSY;
3355
3356 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3357 if (r < 0)
3358 return r;
3359
3360 if (strv_isempty(l))
3361 return -EUNATCH;
3362
3363 socket_unwatch_control_pid(s);
3364 s->clean_result = SOCKET_SUCCESS;
3365 s->control_command = NULL;
3366 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3367
3368 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3369 if (r < 0)
3370 goto fail;
3371
3372 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3373 if (r < 0)
3374 goto fail;
3375
3376 socket_set_state(s, SOCKET_CLEANING);
3377
3378 return 0;
3379
3380 fail:
3381 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3382 s->clean_result = SOCKET_FAILURE_RESOURCES;
3383 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3384 return r;
3385 }
3386
3387 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3388 Socket *s = SOCKET(u);
3389
3390 assert(s);
3391
3392 return exec_context_get_clean_mask(&s->exec_context, ret);
3393 }
3394
3395 static int socket_can_start(Unit *u) {
3396 Socket *s = SOCKET(u);
3397 int r;
3398
3399 assert(s);
3400
3401 r = unit_test_start_limit(u);
3402 if (r < 0) {
3403 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3404 return r;
3405 }
3406
3407 return 1;
3408 }
3409
3410 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3411 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3412 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3413 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3414 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3415 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3416 };
3417
3418 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3419
3420 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3421 [SOCKET_SUCCESS] = "success",
3422 [SOCKET_FAILURE_RESOURCES] = "resources",
3423 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3424 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3425 [SOCKET_FAILURE_SIGNAL] = "signal",
3426 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3427 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3428 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3429 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3430 };
3431
3432 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3433
3434 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3435 [SOCKET_TIMESTAMPING_OFF] = "off",
3436 [SOCKET_TIMESTAMPING_US] = "us",
3437 [SOCKET_TIMESTAMPING_NS] = "ns",
3438 };
3439
3440 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3441
3442 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3443 SocketTimestamping t;
3444 int r;
3445
3446 if (!p)
3447 return _SOCKET_TIMESTAMPING_INVALID;
3448
3449 t = socket_timestamping_from_string(p);
3450 if (t >= 0)
3451 return t;
3452
3453 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3454 * too. */
3455 if (streq(p, "nsec"))
3456 return SOCKET_TIMESTAMPING_NS;
3457 if (STR_IN_SET(p, "usec", "µs"))
3458 return SOCKET_TIMESTAMPING_US;
3459
3460 r = parse_boolean(p);
3461 if (r < 0)
3462 return _SOCKET_TIMESTAMPING_INVALID;
3463
3464 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3465 }
3466
3467 const UnitVTable socket_vtable = {
3468 .object_size = sizeof(Socket),
3469 .exec_context_offset = offsetof(Socket, exec_context),
3470 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3471 .kill_context_offset = offsetof(Socket, kill_context),
3472 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3473 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3474
3475 .sections =
3476 "Unit\0"
3477 "Socket\0"
3478 "Install\0",
3479 .private_section = "Socket",
3480
3481 .can_transient = true,
3482 .can_trigger = true,
3483 .can_fail = true,
3484
3485 .init = socket_init,
3486 .done = socket_done,
3487 .load = socket_load,
3488
3489 .coldplug = socket_coldplug,
3490
3491 .dump = socket_dump,
3492
3493 .start = socket_start,
3494 .stop = socket_stop,
3495
3496 .kill = socket_kill,
3497 .clean = socket_clean,
3498 .can_clean = socket_can_clean,
3499
3500 .get_timeout = socket_get_timeout,
3501
3502 .serialize = socket_serialize,
3503 .deserialize_item = socket_deserialize_item,
3504 .distribute_fds = socket_distribute_fds,
3505
3506 .active_state = socket_active_state,
3507 .sub_state_to_string = socket_sub_state_to_string,
3508
3509 .will_restart = unit_will_restart_default,
3510
3511 .may_gc = socket_may_gc,
3512
3513 .sigchld_event = socket_sigchld_event,
3514
3515 .trigger_notify = socket_trigger_notify,
3516
3517 .reset_failed = socket_reset_failed,
3518
3519 .control_pid = socket_control_pid,
3520
3521 .bus_set_property = bus_socket_set_property,
3522 .bus_commit_properties = bus_socket_commit_properties,
3523
3524 .status_message_formats = {
3525 .finished_start_job = {
3526 [JOB_DONE] = "Listening on %s.",
3527 [JOB_FAILED] = "Failed to listen on %s.",
3528 [JOB_TIMEOUT] = "Timed out starting %s.",
3529 },
3530 .finished_stop_job = {
3531 [JOB_DONE] = "Closed %s.",
3532 [JOB_FAILED] = "Failed stopping %s.",
3533 [JOB_TIMEOUT] = "Timed out stopping %s.",
3534 },
3535 },
3536
3537 .can_start = socket_can_start,
3538 };
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