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Merge pull request #20541 from yuwata/udev-coalesce-follow-up
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "copy.h"
18 #include "dbus-socket.h"
19 #include "dbus-unit.h"
20 #include "def.h"
21 #include "errno-list.h"
22 #include "exit-status.h"
23 #include "fd-util.h"
24 #include "format-util.h"
25 #include "fs-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label.h"
30 #include "log.h"
31 #include "mkdir.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "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), s->control_pid);
113 s->control_pid = 0;
114 }
115
116 static void socket_cleanup_fd_list(SocketPort *p) {
117 assert(p);
118
119 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
120 p->auxiliary_fds = mfree(p->auxiliary_fds);
121 p->n_auxiliary_fds = 0;
122 }
123
124 void socket_free_ports(Socket *s) {
125 SocketPort *p;
126
127 assert(s);
128
129 while ((p = s->ports)) {
130 LIST_REMOVE(port, s->ports, p);
131
132 sd_event_source_unref(p->event_source);
133
134 socket_cleanup_fd_list(p);
135 safe_close(p->fd);
136 free(p->path);
137 free(p);
138 }
139 }
140
141 static void socket_done(Unit *u) {
142 Socket *s = SOCKET(u);
143 SocketPeer *p;
144
145 assert(s);
146
147 socket_free_ports(s);
148
149 while ((p = set_steal_first(s->peers_by_address)))
150 p->socket = NULL;
151
152 s->peers_by_address = set_free(s->peers_by_address);
153
154 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
155 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
156 s->control_command = NULL;
157
158 dynamic_creds_unref(&s->dynamic_creds);
159
160 socket_unwatch_control_pid(s);
161
162 unit_ref_unset(&s->service);
163
164 s->tcp_congestion = mfree(s->tcp_congestion);
165 s->bind_to_device = mfree(s->bind_to_device);
166
167 s->smack = mfree(s->smack);
168 s->smack_ip_in = mfree(s->smack_ip_in);
169 s->smack_ip_out = mfree(s->smack_ip_out);
170
171 strv_free(s->symlinks);
172
173 s->user = mfree(s->user);
174 s->group = mfree(s->group);
175
176 s->fdname = mfree(s->fdname);
177
178 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
179 }
180
181 static int socket_arm_timer(Socket *s, usec_t usec) {
182 int r;
183
184 assert(s);
185
186 if (s->timer_event_source) {
187 r = sd_event_source_set_time(s->timer_event_source, usec);
188 if (r < 0)
189 return r;
190
191 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
192 }
193
194 if (usec == USEC_INFINITY)
195 return 0;
196
197 r = sd_event_add_time(
198 UNIT(s)->manager->event,
199 &s->timer_event_source,
200 CLOCK_MONOTONIC,
201 usec, 0,
202 socket_dispatch_timer, s);
203 if (r < 0)
204 return r;
205
206 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
207
208 return 0;
209 }
210
211 static bool have_non_accept_socket(Socket *s) {
212 SocketPort *p;
213
214 assert(s);
215
216 if (!s->accept)
217 return true;
218
219 LIST_FOREACH(port, p, s->ports) {
220
221 if (p->type != SOCKET_SOCKET)
222 return true;
223
224 if (!socket_address_can_accept(&p->address))
225 return true;
226 }
227
228 return false;
229 }
230
231 static int socket_add_mount_dependencies(Socket *s) {
232 SocketPort *p;
233 int r;
234
235 assert(s);
236
237 LIST_FOREACH(port, p, s->ports) {
238 const char *path = NULL;
239
240 if (p->type == SOCKET_SOCKET)
241 path = socket_address_get_path(&p->address);
242 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
243 path = p->path;
244
245 if (!path)
246 continue;
247
248 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
249 if (r < 0)
250 return r;
251 }
252
253 return 0;
254 }
255
256 static int socket_add_device_dependencies(Socket *s) {
257 char *t;
258
259 assert(s);
260
261 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
262 return 0;
263
264 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
265 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
266 }
267
268 static int socket_add_default_dependencies(Socket *s) {
269 int r;
270 assert(s);
271
272 if (!UNIT(s)->default_dependencies)
273 return 0;
274
275 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
276 if (r < 0)
277 return r;
278
279 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
280 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
281 if (r < 0)
282 return r;
283 }
284
285 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
286 }
287
288 _pure_ static bool socket_has_exec(Socket *s) {
289 unsigned i;
290 assert(s);
291
292 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
293 if (s->exec_command[i])
294 return true;
295
296 return false;
297 }
298
299 static int socket_add_extras(Socket *s) {
300 Unit *u = UNIT(s);
301 int r;
302
303 assert(s);
304
305 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
306 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
307 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
308 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
309 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
310 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
311 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
312 * service starts are typical. */
313
314 if (s->trigger_limit.interval == USEC_INFINITY)
315 s->trigger_limit.interval = 2 * USEC_PER_SEC;
316
317 if (s->trigger_limit.burst == UINT_MAX) {
318 if (s->accept)
319 s->trigger_limit.burst = 200;
320 else
321 s->trigger_limit.burst = 20;
322 }
323
324 if (have_non_accept_socket(s)) {
325
326 if (!UNIT_DEREF(s->service)) {
327 Unit *x;
328
329 r = unit_load_related_unit(u, ".service", &x);
330 if (r < 0)
331 return r;
332
333 unit_ref_set(&s->service, u, x);
334 }
335
336 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
337 if (r < 0)
338 return r;
339 }
340
341 r = socket_add_mount_dependencies(s);
342 if (r < 0)
343 return r;
344
345 r = socket_add_device_dependencies(s);
346 if (r < 0)
347 return r;
348
349 r = unit_patch_contexts(u);
350 if (r < 0)
351 return r;
352
353 if (socket_has_exec(s)) {
354 r = unit_add_exec_dependencies(u, &s->exec_context);
355 if (r < 0)
356 return r;
357 }
358
359 r = unit_set_default_slice(u);
360 if (r < 0)
361 return r;
362
363 r = socket_add_default_dependencies(s);
364 if (r < 0)
365 return r;
366
367 return 0;
368 }
369
370 static const char *socket_find_symlink_target(Socket *s) {
371 const char *found = NULL;
372 SocketPort *p;
373
374 LIST_FOREACH(port, p, s->ports) {
375 const char *f = NULL;
376
377 switch (p->type) {
378
379 case SOCKET_FIFO:
380 f = p->path;
381 break;
382
383 case SOCKET_SOCKET:
384 f = socket_address_get_path(&p->address);
385 break;
386
387 default:
388 break;
389 }
390
391 if (f) {
392 if (found)
393 return NULL;
394
395 found = f;
396 }
397 }
398
399 return found;
400 }
401
402 static int socket_verify(Socket *s) {
403 assert(s);
404 assert(UNIT(s)->load_state == UNIT_LOADED);
405
406 if (!s->ports)
407 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
408
409 if (s->accept && have_non_accept_socket(s))
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
411
412 if (s->accept && s->max_connections <= 0)
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
414
415 if (s->accept && UNIT_DEREF(s->service))
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
417
418 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
420
421 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
422 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.");
423
424 return 0;
425 }
426
427 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
428 assert(s);
429
430 if (s->peer.sa.sa_family == AF_INET)
431 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
432 else if (s->peer.sa.sa_family == AF_INET6)
433 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
434 else if (s->peer.sa.sa_family == AF_VSOCK)
435 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
436 else
437 assert_not_reached();
438 }
439
440 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
441 int r;
442
443 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
444 if (r != 0)
445 return r;
446
447 switch(x->peer.sa.sa_family) {
448 case AF_INET:
449 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
450 case AF_INET6:
451 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
452 case AF_VSOCK:
453 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
454 }
455 assert_not_reached();
456 }
457
458 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
459
460 static int socket_load(Unit *u) {
461 Socket *s = SOCKET(u);
462 int r;
463
464 assert(u);
465 assert(u->load_state == UNIT_STUB);
466
467 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
468 if (r < 0)
469 return r;
470
471 r = unit_load_fragment_and_dropin(u, true);
472 if (r < 0)
473 return r;
474
475 if (u->load_state != UNIT_LOADED)
476 return 0;
477
478 /* This is a new unit? Then let's add in some extras */
479 r = socket_add_extras(s);
480 if (r < 0)
481 return r;
482
483 return socket_verify(s);
484 }
485
486 static SocketPeer *socket_peer_new(void) {
487 SocketPeer *p;
488
489 p = new0(SocketPeer, 1);
490 if (!p)
491 return NULL;
492
493 p->n_ref = 1;
494
495 return p;
496 }
497
498 static SocketPeer *socket_peer_free(SocketPeer *p) {
499 assert(p);
500
501 if (p->socket)
502 set_remove(p->socket->peers_by_address, p);
503
504 return mfree(p);
505 }
506
507 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
508
509 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
510 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
511 SocketPeer sa = {}, *i;
512 socklen_t salen = sizeof(sa.peer);
513 int r;
514
515 assert(fd >= 0);
516 assert(s);
517
518 if (getpeername(fd, &sa.peer.sa, &salen) < 0)
519 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
520
521 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
522 *p = NULL;
523 return 0;
524 }
525
526 i = set_get(s->peers_by_address, &sa);
527 if (i) {
528 *p = socket_peer_ref(i);
529 return 1;
530 }
531
532 remote = socket_peer_new();
533 if (!remote)
534 return log_oom();
535
536 remote->peer = sa.peer;
537 remote->peer_salen = salen;
538
539 r = set_put(s->peers_by_address, remote);
540 if (r < 0)
541 return r;
542
543 remote->socket = s;
544
545 *p = TAKE_PTR(remote);
546
547 return 1;
548 }
549
550 _const_ static const char* listen_lookup(int family, int type) {
551
552 if (family == AF_NETLINK)
553 return "ListenNetlink";
554
555 if (type == SOCK_STREAM)
556 return "ListenStream";
557 else if (type == SOCK_DGRAM)
558 return "ListenDatagram";
559 else if (type == SOCK_SEQPACKET)
560 return "ListenSequentialPacket";
561
562 assert_not_reached();
563 return NULL;
564 }
565
566 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
567 Socket *s = SOCKET(u);
568 SocketPort *p;
569 const char *prefix2, *str;
570
571 assert(s);
572 assert(f);
573
574 prefix = strempty(prefix);
575 prefix2 = strjoina(prefix, "\t");
576
577 fprintf(f,
578 "%sSocket State: %s\n"
579 "%sResult: %s\n"
580 "%sClean Result: %s\n"
581 "%sBindIPv6Only: %s\n"
582 "%sBacklog: %u\n"
583 "%sSocketMode: %04o\n"
584 "%sDirectoryMode: %04o\n"
585 "%sKeepAlive: %s\n"
586 "%sNoDelay: %s\n"
587 "%sFreeBind: %s\n"
588 "%sTransparent: %s\n"
589 "%sBroadcast: %s\n"
590 "%sPassCredentials: %s\n"
591 "%sPassSecurity: %s\n"
592 "%sPassPacketInfo: %s\n"
593 "%sTCPCongestion: %s\n"
594 "%sRemoveOnStop: %s\n"
595 "%sWritable: %s\n"
596 "%sFileDescriptorName: %s\n"
597 "%sSELinuxContextFromNet: %s\n",
598 prefix, socket_state_to_string(s->state),
599 prefix, socket_result_to_string(s->result),
600 prefix, socket_result_to_string(s->clean_result),
601 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
602 prefix, s->backlog,
603 prefix, s->socket_mode,
604 prefix, s->directory_mode,
605 prefix, yes_no(s->keep_alive),
606 prefix, yes_no(s->no_delay),
607 prefix, yes_no(s->free_bind),
608 prefix, yes_no(s->transparent),
609 prefix, yes_no(s->broadcast),
610 prefix, yes_no(s->pass_cred),
611 prefix, yes_no(s->pass_sec),
612 prefix, yes_no(s->pass_pktinfo),
613 prefix, strna(s->tcp_congestion),
614 prefix, yes_no(s->remove_on_stop),
615 prefix, yes_no(s->writable),
616 prefix, socket_fdname(s),
617 prefix, yes_no(s->selinux_context_from_net));
618
619 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
620 fprintf(f,
621 "%sTimestamping: %s\n",
622 prefix, socket_timestamping_to_string(s->timestamping));
623
624 if (s->control_pid > 0)
625 fprintf(f,
626 "%sControl PID: "PID_FMT"\n",
627 prefix, s->control_pid);
628
629 if (s->bind_to_device)
630 fprintf(f,
631 "%sBindToDevice: %s\n",
632 prefix, s->bind_to_device);
633
634 if (s->accept)
635 fprintf(f,
636 "%sAccepted: %u\n"
637 "%sNConnections: %u\n"
638 "%sMaxConnections: %u\n"
639 "%sMaxConnectionsPerSource: %u\n",
640 prefix, s->n_accepted,
641 prefix, s->n_connections,
642 prefix, s->max_connections,
643 prefix, s->max_connections_per_source);
644 else
645 fprintf(f,
646 "%sFlushPending: %s\n",
647 prefix, yes_no(s->flush_pending));
648
649
650 if (s->priority >= 0)
651 fprintf(f,
652 "%sPriority: %i\n",
653 prefix, s->priority);
654
655 if (s->receive_buffer > 0)
656 fprintf(f,
657 "%sReceiveBuffer: %zu\n",
658 prefix, s->receive_buffer);
659
660 if (s->send_buffer > 0)
661 fprintf(f,
662 "%sSendBuffer: %zu\n",
663 prefix, s->send_buffer);
664
665 if (s->ip_tos >= 0)
666 fprintf(f,
667 "%sIPTOS: %i\n",
668 prefix, s->ip_tos);
669
670 if (s->ip_ttl >= 0)
671 fprintf(f,
672 "%sIPTTL: %i\n",
673 prefix, s->ip_ttl);
674
675 if (s->pipe_size > 0)
676 fprintf(f,
677 "%sPipeSize: %zu\n",
678 prefix, s->pipe_size);
679
680 if (s->mark >= 0)
681 fprintf(f,
682 "%sMark: %i\n",
683 prefix, s->mark);
684
685 if (s->mq_maxmsg > 0)
686 fprintf(f,
687 "%sMessageQueueMaxMessages: %li\n",
688 prefix, s->mq_maxmsg);
689
690 if (s->mq_msgsize > 0)
691 fprintf(f,
692 "%sMessageQueueMessageSize: %li\n",
693 prefix, s->mq_msgsize);
694
695 if (s->reuse_port)
696 fprintf(f,
697 "%sReusePort: %s\n",
698 prefix, yes_no(s->reuse_port));
699
700 if (s->smack)
701 fprintf(f,
702 "%sSmackLabel: %s\n",
703 prefix, s->smack);
704
705 if (s->smack_ip_in)
706 fprintf(f,
707 "%sSmackLabelIPIn: %s\n",
708 prefix, s->smack_ip_in);
709
710 if (s->smack_ip_out)
711 fprintf(f,
712 "%sSmackLabelIPOut: %s\n",
713 prefix, s->smack_ip_out);
714
715 if (!isempty(s->user) || !isempty(s->group))
716 fprintf(f,
717 "%sSocketUser: %s\n"
718 "%sSocketGroup: %s\n",
719 prefix, strna(s->user),
720 prefix, strna(s->group));
721
722 if (s->keep_alive_time > 0)
723 fprintf(f,
724 "%sKeepAliveTimeSec: %s\n",
725 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
726
727 if (s->keep_alive_interval > 0)
728 fprintf(f,
729 "%sKeepAliveIntervalSec: %s\n",
730 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
731
732 if (s->keep_alive_cnt > 0)
733 fprintf(f,
734 "%sKeepAliveProbes: %u\n",
735 prefix, s->keep_alive_cnt);
736
737 if (s->defer_accept > 0)
738 fprintf(f,
739 "%sDeferAcceptSec: %s\n",
740 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
741
742 LIST_FOREACH(port, p, s->ports) {
743
744 switch (p->type) {
745 case SOCKET_SOCKET: {
746 _cleanup_free_ char *k = NULL;
747 const char *t;
748 int r;
749
750 r = socket_address_print(&p->address, &k);
751 if (r < 0)
752 t = strerror_safe(r);
753 else
754 t = k;
755
756 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
757 break;
758 }
759 case SOCKET_SPECIAL:
760 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
761 break;
762 case SOCKET_USB_FUNCTION:
763 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
764 break;
765 case SOCKET_MQUEUE:
766 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
767 break;
768 default:
769 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
770 }
771 }
772
773 fprintf(f,
774 "%sTriggerLimitIntervalSec: %s\n"
775 "%sTriggerLimitBurst: %u\n",
776 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
777 prefix, s->trigger_limit.burst);
778
779 str = ip_protocol_to_name(s->socket_protocol);
780 if (str)
781 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
782
783 if (!strv_isempty(s->symlinks)) {
784 char **q;
785
786 fprintf(f, "%sSymlinks:", prefix);
787 STRV_FOREACH(q, s->symlinks)
788 fprintf(f, " %s", *q);
789
790 fprintf(f, "\n");
791 }
792
793 fprintf(f,
794 "%sTimeoutSec: %s\n",
795 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
796
797 exec_context_dump(&s->exec_context, f, prefix);
798 kill_context_dump(&s->kill_context, f, prefix);
799
800 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
801 if (!s->exec_command[c])
802 continue;
803
804 fprintf(f, "%s-> %s:\n",
805 prefix, socket_exec_command_to_string(c));
806
807 exec_command_dump_list(s->exec_command[c], f, prefix2);
808 }
809
810 cgroup_context_dump(UNIT(s), f, prefix);
811 }
812
813 static int instance_from_socket(int fd, unsigned nr, char **instance) {
814 socklen_t l;
815 char *r;
816 union sockaddr_union local, remote;
817
818 assert(fd >= 0);
819 assert(instance);
820
821 l = sizeof(local);
822 if (getsockname(fd, &local.sa, &l) < 0)
823 return -errno;
824
825 l = sizeof(remote);
826 if (getpeername(fd, &remote.sa, &l) < 0)
827 return -errno;
828
829 switch (local.sa.sa_family) {
830
831 case AF_INET: {
832 uint32_t
833 a = be32toh(local.in.sin_addr.s_addr),
834 b = be32toh(remote.in.sin_addr.s_addr);
835
836 if (asprintf(&r,
837 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
838 nr,
839 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
840 be16toh(local.in.sin_port),
841 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
842 be16toh(remote.in.sin_port)) < 0)
843 return -ENOMEM;
844
845 break;
846 }
847
848 case AF_INET6: {
849 static const unsigned char ipv4_prefix[] = {
850 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
851 };
852
853 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
854 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
855 const uint8_t
856 *a = local.in6.sin6_addr.s6_addr+12,
857 *b = remote.in6.sin6_addr.s6_addr+12;
858
859 if (asprintf(&r,
860 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
861 nr,
862 a[0], a[1], a[2], a[3],
863 be16toh(local.in6.sin6_port),
864 b[0], b[1], b[2], b[3],
865 be16toh(remote.in6.sin6_port)) < 0)
866 return -ENOMEM;
867 } else {
868 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
869
870 if (asprintf(&r,
871 "%u-%s:%u-%s:%u",
872 nr,
873 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
874 be16toh(local.in6.sin6_port),
875 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
876 be16toh(remote.in6.sin6_port)) < 0)
877 return -ENOMEM;
878 }
879
880 break;
881 }
882
883 case AF_UNIX: {
884 struct ucred ucred;
885 int k;
886
887 k = getpeercred(fd, &ucred);
888 if (k >= 0) {
889 if (asprintf(&r,
890 "%u-"PID_FMT"-"UID_FMT,
891 nr, ucred.pid, ucred.uid) < 0)
892 return -ENOMEM;
893 } else if (k == -ENODATA) {
894 /* This handles the case where somebody is
895 * connecting from another pid/uid namespace
896 * (e.g. from outside of our container). */
897 if (asprintf(&r,
898 "%u-unknown",
899 nr) < 0)
900 return -ENOMEM;
901 } else
902 return k;
903
904 break;
905 }
906
907 case AF_VSOCK:
908 if (asprintf(&r,
909 "%u-%u:%u-%u:%u",
910 nr,
911 local.vm.svm_cid, local.vm.svm_port,
912 remote.vm.svm_cid, remote.vm.svm_port) < 0)
913 return -ENOMEM;
914
915 break;
916
917 default:
918 assert_not_reached();
919 }
920
921 *instance = r;
922 return 0;
923 }
924
925 static void socket_close_fds(Socket *s) {
926 SocketPort *p;
927 char **i;
928
929 assert(s);
930
931 LIST_FOREACH(port, p, s->ports) {
932 bool was_open;
933
934 was_open = p->fd >= 0;
935
936 p->event_source = sd_event_source_disable_unref(p->event_source);
937 p->fd = safe_close(p->fd);
938 socket_cleanup_fd_list(p);
939
940 /* One little note: we should normally not delete any sockets in the file system here! After all some
941 * other process we spawned might still have a reference of this fd and wants to continue to use
942 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
943 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
944 * anyway, but only then. */
945
946 if (!was_open || !s->remove_on_stop)
947 continue;
948
949 switch (p->type) {
950
951 case SOCKET_FIFO:
952 (void) unlink(p->path);
953 break;
954
955 case SOCKET_MQUEUE:
956 (void) mq_unlink(p->path);
957 break;
958
959 case SOCKET_SOCKET:
960 (void) socket_address_unlink(&p->address);
961 break;
962
963 default:
964 break;
965 }
966 }
967
968 if (s->remove_on_stop)
969 STRV_FOREACH(i, s->symlinks)
970 (void) unlink(*i);
971
972 /* Note that we don't return NULL here, since s has not been freed. */
973 }
974
975 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
976 int r;
977
978 assert(s);
979 assert(p);
980 assert(fd >= 0);
981
982 if (s->keep_alive) {
983 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
984 if (r < 0)
985 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
986 }
987
988 if (s->keep_alive_time > 0) {
989 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
990 if (r < 0)
991 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
992 }
993
994 if (s->keep_alive_interval > 0) {
995 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
996 if (r < 0)
997 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
998 }
999
1000 if (s->keep_alive_cnt > 0) {
1001 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1002 if (r < 0)
1003 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1004 }
1005
1006 if (s->defer_accept > 0) {
1007 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1008 if (r < 0)
1009 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1010 }
1011
1012 if (s->no_delay) {
1013 if (s->socket_protocol == IPPROTO_SCTP) {
1014 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1015 if (r < 0)
1016 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1017 } else {
1018 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1019 if (r < 0)
1020 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1021 }
1022 }
1023
1024 if (s->broadcast) {
1025 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1026 if (r < 0)
1027 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1028 }
1029
1030 if (s->pass_cred) {
1031 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1032 if (r < 0)
1033 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1034 }
1035
1036 if (s->pass_sec) {
1037 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1038 if (r < 0)
1039 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1040 }
1041
1042 if (s->pass_pktinfo) {
1043 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1044 if (r < 0)
1045 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1046 }
1047
1048 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1049 r = setsockopt_int(fd, SOL_SOCKET,
1050 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1051 true);
1052 if (r < 0)
1053 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1054 }
1055
1056 if (s->priority >= 0) {
1057 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1058 if (r < 0)
1059 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1060 }
1061
1062 if (s->receive_buffer > 0) {
1063 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1064 if (r < 0)
1065 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1066 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1067 }
1068
1069 if (s->send_buffer > 0) {
1070 r = fd_set_sndbuf(fd, s->send_buffer, false);
1071 if (r < 0)
1072 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1073 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1074 }
1075
1076 if (s->mark >= 0) {
1077 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1078 if (r < 0)
1079 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1080 }
1081
1082 if (s->ip_tos >= 0) {
1083 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1084 if (r < 0)
1085 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1086 }
1087
1088 if (s->ip_ttl >= 0) {
1089 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1090 if (r < 0)
1091 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1092 }
1093
1094 if (s->tcp_congestion)
1095 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1096 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1097
1098 if (s->smack_ip_in) {
1099 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1100 if (r < 0)
1101 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1102 }
1103
1104 if (s->smack_ip_out) {
1105 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1106 if (r < 0)
1107 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1108 }
1109 }
1110
1111 static void socket_apply_fifo_options(Socket *s, int fd) {
1112 int r;
1113
1114 assert(s);
1115 assert(fd >= 0);
1116
1117 if (s->pipe_size > 0)
1118 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1119 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1120
1121 if (s->smack) {
1122 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1123 if (r < 0)
1124 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1125 }
1126 }
1127
1128 static int fifo_address_create(
1129 const char *path,
1130 mode_t directory_mode,
1131 mode_t socket_mode) {
1132
1133 _cleanup_close_ int fd = -1;
1134 mode_t old_mask;
1135 struct stat st;
1136 int r;
1137
1138 assert(path);
1139
1140 (void) mkdir_parents_label(path, directory_mode);
1141
1142 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1143 if (r < 0)
1144 return r;
1145
1146 /* Enforce the right access mode for the fifo */
1147 old_mask = umask(~socket_mode);
1148
1149 /* Include the original umask in our mask */
1150 (void) umask(~socket_mode | old_mask);
1151
1152 r = mkfifo(path, socket_mode);
1153 (void) umask(old_mask);
1154
1155 if (r < 0 && errno != EEXIST) {
1156 r = -errno;
1157 goto fail;
1158 }
1159
1160 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1161 if (fd < 0) {
1162 r = -errno;
1163 goto fail;
1164 }
1165
1166 mac_selinux_create_file_clear();
1167
1168 if (fstat(fd, &st) < 0) {
1169 r = -errno;
1170 goto fail;
1171 }
1172
1173 if (!S_ISFIFO(st.st_mode) ||
1174 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1175 st.st_uid != getuid() ||
1176 st.st_gid != getgid()) {
1177 r = -EEXIST;
1178 goto fail;
1179 }
1180
1181 return TAKE_FD(fd);
1182
1183 fail:
1184 mac_selinux_create_file_clear();
1185 return r;
1186 }
1187
1188 static int special_address_create(const char *path, bool writable) {
1189 _cleanup_close_ int fd = -1;
1190 struct stat st;
1191
1192 assert(path);
1193
1194 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1195 if (fd < 0)
1196 return -errno;
1197
1198 if (fstat(fd, &st) < 0)
1199 return -errno;
1200
1201 /* Check whether this is a /proc, /sys or /dev file or char device */
1202 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1203 return -EEXIST;
1204
1205 return TAKE_FD(fd);
1206 }
1207
1208 static int usbffs_address_create(const char *path) {
1209 _cleanup_close_ int fd = -1;
1210 struct stat st;
1211
1212 assert(path);
1213
1214 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1215 if (fd < 0)
1216 return -errno;
1217
1218 if (fstat(fd, &st) < 0)
1219 return -errno;
1220
1221 /* Check whether this is a regular file (ffs endpoint) */
1222 if (!S_ISREG(st.st_mode))
1223 return -EEXIST;
1224
1225 return TAKE_FD(fd);
1226 }
1227
1228 static int mq_address_create(
1229 const char *path,
1230 mode_t mq_mode,
1231 long maxmsg,
1232 long msgsize) {
1233
1234 _cleanup_close_ int fd = -1;
1235 struct stat st;
1236 mode_t old_mask;
1237 struct mq_attr _attr, *attr = NULL;
1238
1239 assert(path);
1240
1241 if (maxmsg > 0 && msgsize > 0) {
1242 _attr = (struct mq_attr) {
1243 .mq_flags = O_NONBLOCK,
1244 .mq_maxmsg = maxmsg,
1245 .mq_msgsize = msgsize,
1246 };
1247 attr = &_attr;
1248 }
1249
1250 /* Enforce the right access mode for the mq */
1251 old_mask = umask(~mq_mode);
1252
1253 /* Include the original umask in our mask */
1254 (void) umask(~mq_mode | old_mask);
1255 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1256 (void) umask(old_mask);
1257
1258 if (fd < 0)
1259 return -errno;
1260
1261 if (fstat(fd, &st) < 0)
1262 return -errno;
1263
1264 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1265 st.st_uid != getuid() ||
1266 st.st_gid != getgid())
1267 return -EEXIST;
1268
1269 return TAKE_FD(fd);
1270 }
1271
1272 static int socket_symlink(Socket *s) {
1273 const char *p;
1274 char **i;
1275 int r;
1276
1277 assert(s);
1278
1279 p = socket_find_symlink_target(s);
1280 if (!p)
1281 return 0;
1282
1283 STRV_FOREACH(i, s->symlinks) {
1284 (void) mkdir_parents_label(*i, s->directory_mode);
1285
1286 r = symlink_idempotent(p, *i, false);
1287
1288 if (r == -EEXIST && s->remove_on_stop) {
1289 /* If there's already something where we want to create the symlink, and the destructive
1290 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1291 * again. */
1292
1293 if (unlink(*i) >= 0)
1294 r = symlink_idempotent(p, *i, false);
1295 }
1296
1297 if (r < 0)
1298 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1299 }
1300
1301 return 0;
1302 }
1303
1304 static int usbffs_write_descs(int fd, Service *s) {
1305 int r;
1306
1307 if (!s->usb_function_descriptors || !s->usb_function_strings)
1308 return -EINVAL;
1309
1310 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1311 if (r < 0)
1312 return r;
1313
1314 return copy_file_fd(s->usb_function_strings, fd, 0);
1315 }
1316
1317 static int usbffs_select_ep(const struct dirent *d) {
1318 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1319 }
1320
1321 static int usbffs_dispatch_eps(SocketPort *p) {
1322 _cleanup_free_ struct dirent **ent = NULL;
1323 size_t n, k;
1324 int r;
1325
1326 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1327 if (r < 0)
1328 return -errno;
1329
1330 n = (size_t) r;
1331 p->auxiliary_fds = new(int, n);
1332 if (!p->auxiliary_fds) {
1333 r = -ENOMEM;
1334 goto clear;
1335 }
1336
1337 p->n_auxiliary_fds = n;
1338
1339 k = 0;
1340 for (size_t i = 0; i < n; ++i) {
1341 _cleanup_free_ char *ep = NULL;
1342
1343 ep = path_make_absolute(ent[i]->d_name, p->path);
1344 if (!ep) {
1345 r = -ENOMEM;
1346 goto fail;
1347 }
1348
1349 path_simplify(ep);
1350
1351 r = usbffs_address_create(ep);
1352 if (r < 0)
1353 goto fail;
1354
1355 p->auxiliary_fds[k++] = r;
1356 }
1357
1358 r = 0;
1359 goto clear;
1360
1361 fail:
1362 close_many(p->auxiliary_fds, k);
1363 p->auxiliary_fds = mfree(p->auxiliary_fds);
1364 p->n_auxiliary_fds = 0;
1365
1366 clear:
1367 for (size_t i = 0; i < n; ++i)
1368 free(ent[i]);
1369
1370 return r;
1371 }
1372
1373 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1374 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1375 *
1376 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1377 * instance name.
1378 */
1379
1380 if (UNIT_ISSET(s->service)) {
1381 *ret = UNIT_DEREF(s->service);
1382 return 0;
1383 }
1384
1385 if (!s->accept)
1386 return -ENODATA;
1387
1388 /* Build the instance name and load the unit */
1389 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1390 int r;
1391
1392 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1393 if (r < 0)
1394 return r;
1395
1396 if (cfd >= 0) {
1397 r = instance_from_socket(cfd, s->n_accepted, &instance);
1398 if (ERRNO_IS_DISCONNECT(r))
1399 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1400 * different errors. This connection is over, but the socket unit lives on. */
1401 return log_unit_debug_errno(UNIT(s), r,
1402 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1403 errno_to_name(r));
1404 if (r < 0)
1405 return r;
1406 }
1407
1408 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1409 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1410 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1411 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1412 if (r < 0)
1413 return r;
1414
1415 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1416 }
1417
1418 static int socket_determine_selinux_label(Socket *s, char **ret) {
1419 int r;
1420
1421 assert(s);
1422 assert(ret);
1423
1424 if (s->selinux_context_from_net) {
1425 /* If this is requested, get the label from the network label */
1426
1427 r = mac_selinux_get_our_label(ret);
1428 if (r == -EOPNOTSUPP)
1429 goto no_label;
1430
1431 } else {
1432 /* Otherwise, get it from the executable we are about to start. */
1433
1434 Unit *service;
1435 ExecCommand *c;
1436 _cleanup_free_ char *path = NULL;
1437
1438 r = socket_load_service_unit(s, -1, &service);
1439 if (r == -ENODATA)
1440 goto no_label;
1441 if (r < 0)
1442 return r;
1443
1444 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1445 if (!c)
1446 goto no_label;
1447
1448 r = chase_symlinks(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1449 if (r < 0)
1450 goto no_label;
1451
1452 r = mac_selinux_get_create_label_from_exe(path, ret);
1453 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1454 goto no_label;
1455 }
1456
1457 return r;
1458
1459 no_label:
1460 *ret = NULL;
1461 return 0;
1462 }
1463
1464 static int socket_address_listen_do(
1465 Socket *s,
1466 const SocketAddress *address,
1467 const char *label) {
1468
1469 assert(s);
1470 assert(address);
1471
1472 return socket_address_listen(
1473 address,
1474 SOCK_CLOEXEC|SOCK_NONBLOCK,
1475 s->backlog,
1476 s->bind_ipv6_only,
1477 s->bind_to_device,
1478 s->reuse_port,
1479 s->free_bind,
1480 s->transparent,
1481 s->directory_mode,
1482 s->socket_mode,
1483 label);
1484 }
1485
1486 #define log_address_error_errno(u, address, error, fmt) \
1487 ({ \
1488 _cleanup_free_ char *_t = NULL; \
1489 \
1490 (void) socket_address_print(address, &_t); \
1491 log_unit_error_errno(u, error, fmt, strna(_t)); \
1492 })
1493
1494 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1495 int r;
1496
1497 assert(address);
1498 assert(context);
1499
1500 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1501
1502 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1503 r = bpf_firewall_supported();
1504 if (r < 0)
1505 return r;
1506 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1507 return true;
1508 }
1509
1510 return context->private_network || context->network_namespace_path;
1511 }
1512
1513 static int socket_address_listen_in_cgroup(
1514 Socket *s,
1515 const SocketAddress *address,
1516 const char *label) {
1517
1518 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1519 int fd, r;
1520 pid_t pid;
1521
1522 assert(s);
1523 assert(address);
1524
1525 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1526 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1527 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1528 * such. */
1529
1530 r = fork_needed(address, &s->exec_context);
1531 if (r < 0)
1532 return r;
1533 if (r == 0) {
1534 /* Shortcut things... */
1535 fd = socket_address_listen_do(s, address, label);
1536 if (fd < 0)
1537 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1538
1539 return fd;
1540 }
1541
1542 r = unit_setup_exec_runtime(UNIT(s));
1543 if (r < 0)
1544 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1545
1546 if (s->exec_context.network_namespace_path &&
1547 s->exec_runtime &&
1548 s->exec_runtime->netns_storage_socket[0] >= 0) {
1549 r = open_shareable_ns_path(s->exec_runtime->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1550 if (r < 0)
1551 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1552 }
1553
1554 if (s->exec_context.ipc_namespace_path &&
1555 s->exec_runtime &&
1556 s->exec_runtime->ipcns_storage_socket[0] >= 0) {
1557 r = open_shareable_ns_path(s->exec_runtime->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1558 if (r < 0)
1559 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1560 }
1561
1562 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1563 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1564
1565 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1566 if (r < 0)
1567 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1568 if (r == 0) {
1569 /* Child */
1570
1571 pair[0] = safe_close(pair[0]);
1572
1573 if ((s->exec_context.private_network || s->exec_context.network_namespace_path) &&
1574 s->exec_runtime &&
1575 s->exec_runtime->netns_storage_socket[0] >= 0) {
1576
1577 if (ns_type_supported(NAMESPACE_NET)) {
1578 r = setup_shareable_ns(s->exec_runtime->netns_storage_socket, CLONE_NEWNET);
1579 if (r < 0) {
1580 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1581 _exit(EXIT_NETWORK);
1582 }
1583 } else if (s->exec_context.network_namespace_path) {
1584 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1585 _exit(EXIT_NETWORK);
1586 } else
1587 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1588 }
1589
1590 fd = socket_address_listen_do(s, address, label);
1591 if (fd < 0) {
1592 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1593 _exit(EXIT_FAILURE);
1594 }
1595
1596 r = send_one_fd(pair[1], fd, 0);
1597 if (r < 0) {
1598 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1599 _exit(EXIT_FAILURE);
1600 }
1601
1602 _exit(EXIT_SUCCESS);
1603 }
1604
1605 pair[1] = safe_close(pair[1]);
1606 fd = receive_one_fd(pair[0], 0);
1607
1608 /* We synchronously wait for the helper, as it shouldn't be slow */
1609 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1610 if (r < 0) {
1611 safe_close(fd);
1612 return r;
1613 }
1614
1615 if (fd < 0)
1616 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1617
1618 return fd;
1619 }
1620
1621 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1622
1623 static int socket_open_fds(Socket *orig_s) {
1624 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1625 _cleanup_(mac_selinux_freep) char *label = NULL;
1626 bool know_label = false;
1627 SocketPort *p;
1628 int r;
1629
1630 assert(s);
1631
1632 LIST_FOREACH(port, p, s->ports) {
1633
1634 if (p->fd >= 0)
1635 continue;
1636
1637 switch (p->type) {
1638
1639 case SOCKET_SOCKET:
1640
1641 if (!know_label) {
1642 /* Figure out the label, if we don't it know yet. We do it once for the first
1643 * socket where we need this and remember it for the rest. */
1644
1645 r = socket_determine_selinux_label(s, &label);
1646 if (r < 0)
1647 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1648
1649 know_label = true;
1650 }
1651
1652 /* Apply the socket protocol */
1653 switch (p->address.type) {
1654
1655 case SOCK_STREAM:
1656 case SOCK_SEQPACKET:
1657 if (s->socket_protocol == IPPROTO_SCTP)
1658 p->address.protocol = s->socket_protocol;
1659 break;
1660
1661 case SOCK_DGRAM:
1662 if (s->socket_protocol == IPPROTO_UDPLITE)
1663 p->address.protocol = s->socket_protocol;
1664 break;
1665 }
1666
1667 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1668 if (p->fd < 0)
1669 return p->fd;
1670
1671 socket_apply_socket_options(s, p, p->fd);
1672 socket_symlink(s);
1673 break;
1674
1675 case SOCKET_SPECIAL:
1676
1677 p->fd = special_address_create(p->path, s->writable);
1678 if (p->fd < 0)
1679 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1680 break;
1681
1682 case SOCKET_FIFO:
1683
1684 p->fd = fifo_address_create(
1685 p->path,
1686 s->directory_mode,
1687 s->socket_mode);
1688 if (p->fd < 0)
1689 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1690
1691 socket_apply_fifo_options(s, p->fd);
1692 socket_symlink(s);
1693 break;
1694
1695 case SOCKET_MQUEUE:
1696
1697 p->fd = mq_address_create(
1698 p->path,
1699 s->socket_mode,
1700 s->mq_maxmsg,
1701 s->mq_msgsize);
1702 if (p->fd < 0)
1703 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1704 break;
1705
1706 case SOCKET_USB_FUNCTION: {
1707 _cleanup_free_ char *ep = NULL;
1708
1709 ep = path_make_absolute("ep0", p->path);
1710 if (!ep)
1711 return -ENOMEM;
1712
1713 p->fd = usbffs_address_create(ep);
1714 if (p->fd < 0)
1715 return p->fd;
1716
1717 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1718 if (r < 0)
1719 return r;
1720
1721 r = usbffs_dispatch_eps(p);
1722 if (r < 0)
1723 return r;
1724
1725 break;
1726 }
1727 default:
1728 assert_not_reached();
1729 }
1730 }
1731
1732 s = NULL;
1733 return 0;
1734 }
1735
1736 static void socket_unwatch_fds(Socket *s) {
1737 SocketPort *p;
1738 int r;
1739
1740 assert(s);
1741
1742 LIST_FOREACH(port, p, s->ports) {
1743 if (p->fd < 0)
1744 continue;
1745
1746 if (!p->event_source)
1747 continue;
1748
1749 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1750 if (r < 0)
1751 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1752 }
1753 }
1754
1755 static int socket_watch_fds(Socket *s) {
1756 SocketPort *p;
1757 int r;
1758
1759 assert(s);
1760
1761 LIST_FOREACH(port, p, s->ports) {
1762 if (p->fd < 0)
1763 continue;
1764
1765 if (p->event_source) {
1766 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1767 if (r < 0)
1768 goto fail;
1769 } else {
1770 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1771 if (r < 0)
1772 goto fail;
1773
1774 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1775 }
1776 }
1777
1778 return 0;
1779
1780 fail:
1781 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1782 socket_unwatch_fds(s);
1783 return r;
1784 }
1785
1786 enum {
1787 SOCKET_OPEN_NONE,
1788 SOCKET_OPEN_SOME,
1789 SOCKET_OPEN_ALL,
1790 };
1791
1792 static int socket_check_open(Socket *s) {
1793 bool have_open = false, have_closed = false;
1794 SocketPort *p;
1795
1796 assert(s);
1797
1798 LIST_FOREACH(port, p, s->ports) {
1799 if (p->fd < 0)
1800 have_closed = true;
1801 else
1802 have_open = true;
1803
1804 if (have_open && have_closed)
1805 return SOCKET_OPEN_SOME;
1806 }
1807
1808 if (have_open)
1809 return SOCKET_OPEN_ALL;
1810
1811 return SOCKET_OPEN_NONE;
1812 }
1813
1814 static void socket_set_state(Socket *s, SocketState state) {
1815 SocketState old_state;
1816 assert(s);
1817
1818 if (s->state != state)
1819 bus_unit_send_pending_change_signal(UNIT(s), false);
1820
1821 old_state = s->state;
1822 s->state = state;
1823
1824 if (!IN_SET(state,
1825 SOCKET_START_PRE,
1826 SOCKET_START_CHOWN,
1827 SOCKET_START_POST,
1828 SOCKET_STOP_PRE,
1829 SOCKET_STOP_PRE_SIGTERM,
1830 SOCKET_STOP_PRE_SIGKILL,
1831 SOCKET_STOP_POST,
1832 SOCKET_FINAL_SIGTERM,
1833 SOCKET_FINAL_SIGKILL,
1834 SOCKET_CLEANING)) {
1835
1836 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1837 socket_unwatch_control_pid(s);
1838 s->control_command = NULL;
1839 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1840 }
1841
1842 if (state != SOCKET_LISTENING)
1843 socket_unwatch_fds(s);
1844
1845 if (!IN_SET(state,
1846 SOCKET_START_CHOWN,
1847 SOCKET_START_POST,
1848 SOCKET_LISTENING,
1849 SOCKET_RUNNING,
1850 SOCKET_STOP_PRE,
1851 SOCKET_STOP_PRE_SIGTERM,
1852 SOCKET_STOP_PRE_SIGKILL,
1853 SOCKET_CLEANING))
1854 socket_close_fds(s);
1855
1856 if (state != old_state)
1857 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1858
1859 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1860 }
1861
1862 static int socket_coldplug(Unit *u) {
1863 Socket *s = SOCKET(u);
1864 int r;
1865
1866 assert(s);
1867 assert(s->state == SOCKET_DEAD);
1868
1869 if (s->deserialized_state == s->state)
1870 return 0;
1871
1872 if (s->control_pid > 0 &&
1873 pid_is_unwaited(s->control_pid) &&
1874 IN_SET(s->deserialized_state,
1875 SOCKET_START_PRE,
1876 SOCKET_START_CHOWN,
1877 SOCKET_START_POST,
1878 SOCKET_STOP_PRE,
1879 SOCKET_STOP_PRE_SIGTERM,
1880 SOCKET_STOP_PRE_SIGKILL,
1881 SOCKET_STOP_POST,
1882 SOCKET_FINAL_SIGTERM,
1883 SOCKET_FINAL_SIGKILL,
1884 SOCKET_CLEANING)) {
1885
1886 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1887 if (r < 0)
1888 return r;
1889
1890 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1891 if (r < 0)
1892 return r;
1893 }
1894
1895 if (IN_SET(s->deserialized_state,
1896 SOCKET_START_CHOWN,
1897 SOCKET_START_POST,
1898 SOCKET_LISTENING,
1899 SOCKET_RUNNING)) {
1900
1901 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1902 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1903 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1904 * and if there's a mismatch, warn loudly. */
1905
1906 r = socket_check_open(s);
1907 if (r == SOCKET_OPEN_NONE)
1908 log_unit_warning(UNIT(s),
1909 "Socket unit configuration has changed while unit has been running, "
1910 "no open socket file descriptor left. "
1911 "The socket unit is not functional until restarted.");
1912 else if (r == SOCKET_OPEN_SOME)
1913 log_unit_warning(UNIT(s),
1914 "Socket unit configuration has changed while unit has been running, "
1915 "and some socket file descriptors have not been opened yet. "
1916 "The socket unit is not fully functional until restarted.");
1917 }
1918
1919 if (s->deserialized_state == SOCKET_LISTENING) {
1920 r = socket_watch_fds(s);
1921 if (r < 0)
1922 return r;
1923 }
1924
1925 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING)) {
1926 (void) unit_setup_dynamic_creds(u);
1927 (void) unit_setup_exec_runtime(u);
1928 }
1929
1930 socket_set_state(s, s->deserialized_state);
1931 return 0;
1932 }
1933
1934 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1935
1936 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1937 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1938 .stdin_fd = -1,
1939 .stdout_fd = -1,
1940 .stderr_fd = -1,
1941 .exec_fd = -1,
1942 };
1943 pid_t pid;
1944 int r;
1945
1946 assert(s);
1947 assert(c);
1948 assert(_pid);
1949
1950 r = unit_prepare_exec(UNIT(s));
1951 if (r < 0)
1952 return r;
1953
1954 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1955 if (r < 0)
1956 return r;
1957
1958 r = unit_set_exec_params(UNIT(s), &exec_params);
1959 if (r < 0)
1960 return r;
1961
1962 r = exec_spawn(UNIT(s),
1963 c,
1964 &s->exec_context,
1965 &exec_params,
1966 s->exec_runtime,
1967 &s->dynamic_creds,
1968 &pid);
1969 if (r < 0)
1970 return r;
1971
1972 r = unit_watch_pid(UNIT(s), pid, true);
1973 if (r < 0)
1974 return r;
1975
1976 *_pid = pid;
1977
1978 return 0;
1979 }
1980
1981 static int socket_chown(Socket *s, pid_t *_pid) {
1982 pid_t pid;
1983 int r;
1984
1985 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1986 if (r < 0)
1987 goto fail;
1988
1989 /* We have to resolve the user names out-of-process, hence
1990 * let's fork here. It's messy, but well, what can we do? */
1991
1992 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1993 if (r < 0)
1994 return r;
1995 if (r == 0) {
1996 uid_t uid = UID_INVALID;
1997 gid_t gid = GID_INVALID;
1998 SocketPort *p;
1999
2000 /* Child */
2001
2002 if (!isempty(s->user)) {
2003 const char *user = s->user;
2004
2005 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
2006 if (r < 0) {
2007 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2008 _exit(EXIT_USER);
2009 }
2010 }
2011
2012 if (!isempty(s->group)) {
2013 const char *group = s->group;
2014
2015 r = get_group_creds(&group, &gid, 0);
2016 if (r < 0) {
2017 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2018 _exit(EXIT_GROUP);
2019 }
2020 }
2021
2022 LIST_FOREACH(port, p, s->ports) {
2023 const char *path = NULL;
2024
2025 if (p->type == SOCKET_SOCKET)
2026 path = socket_address_get_path(&p->address);
2027 else if (p->type == SOCKET_FIFO)
2028 path = p->path;
2029
2030 if (!path)
2031 continue;
2032
2033 if (chown(path, uid, gid) < 0) {
2034 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2035 _exit(EXIT_CHOWN);
2036 }
2037 }
2038
2039 _exit(EXIT_SUCCESS);
2040 }
2041
2042 r = unit_watch_pid(UNIT(s), pid, true);
2043 if (r < 0)
2044 goto fail;
2045
2046 *_pid = pid;
2047 return 0;
2048
2049 fail:
2050 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2051 return r;
2052 }
2053
2054 static void socket_enter_dead(Socket *s, SocketResult f) {
2055 assert(s);
2056
2057 if (s->result == SOCKET_SUCCESS)
2058 s->result = f;
2059
2060 if (s->result == SOCKET_SUCCESS)
2061 unit_log_success(UNIT(s));
2062 else
2063 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2064
2065 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2066
2067 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2068
2069 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
2070
2071 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2072
2073 unit_unref_uid_gid(UNIT(s), true);
2074
2075 dynamic_creds_destroy(&s->dynamic_creds);
2076 }
2077
2078 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2079
2080 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2081 int r;
2082 assert(s);
2083
2084 if (s->result == SOCKET_SUCCESS)
2085 s->result = f;
2086
2087 socket_unwatch_control_pid(s);
2088 s->control_command_id = SOCKET_EXEC_STOP_POST;
2089 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2090
2091 if (s->control_command) {
2092 r = socket_spawn(s, s->control_command, &s->control_pid);
2093 if (r < 0)
2094 goto fail;
2095
2096 socket_set_state(s, SOCKET_STOP_POST);
2097 } else
2098 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2099
2100 return;
2101
2102 fail:
2103 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2104 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2105 }
2106
2107 static int state_to_kill_operation(Socket *s, SocketState state) {
2108 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2109 return KILL_RESTART;
2110
2111 if (state == SOCKET_FINAL_SIGTERM)
2112 return KILL_TERMINATE;
2113
2114 return KILL_KILL;
2115 }
2116
2117 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2118 int r;
2119
2120 assert(s);
2121
2122 if (s->result == SOCKET_SUCCESS)
2123 s->result = f;
2124
2125 r = unit_kill_context(
2126 UNIT(s),
2127 &s->kill_context,
2128 state_to_kill_operation(s, state),
2129 -1,
2130 s->control_pid,
2131 false);
2132 if (r < 0)
2133 goto fail;
2134
2135 if (r > 0) {
2136 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2137 if (r < 0)
2138 goto fail;
2139
2140 socket_set_state(s, state);
2141 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2142 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2143 else if (state == SOCKET_STOP_PRE_SIGKILL)
2144 socket_enter_stop_post(s, SOCKET_SUCCESS);
2145 else if (state == SOCKET_FINAL_SIGTERM)
2146 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2147 else
2148 socket_enter_dead(s, SOCKET_SUCCESS);
2149
2150 return;
2151
2152 fail:
2153 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2154
2155 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2156 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2157 else
2158 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2159 }
2160
2161 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2162 int r;
2163 assert(s);
2164
2165 if (s->result == SOCKET_SUCCESS)
2166 s->result = f;
2167
2168 socket_unwatch_control_pid(s);
2169 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2170 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2171
2172 if (s->control_command) {
2173 r = socket_spawn(s, s->control_command, &s->control_pid);
2174 if (r < 0)
2175 goto fail;
2176
2177 socket_set_state(s, SOCKET_STOP_PRE);
2178 } else
2179 socket_enter_stop_post(s, SOCKET_SUCCESS);
2180
2181 return;
2182
2183 fail:
2184 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2185 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2186 }
2187
2188 static void socket_enter_listening(Socket *s) {
2189 int r;
2190 assert(s);
2191
2192 if (!s->accept && s->flush_pending) {
2193 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2194 flush_ports(s);
2195 }
2196
2197 r = socket_watch_fds(s);
2198 if (r < 0) {
2199 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2200 goto fail;
2201 }
2202
2203 socket_set_state(s, SOCKET_LISTENING);
2204 return;
2205
2206 fail:
2207 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2208 }
2209
2210 static void socket_enter_start_post(Socket *s) {
2211 int r;
2212 assert(s);
2213
2214 socket_unwatch_control_pid(s);
2215 s->control_command_id = SOCKET_EXEC_START_POST;
2216 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2217
2218 if (s->control_command) {
2219 r = socket_spawn(s, s->control_command, &s->control_pid);
2220 if (r < 0) {
2221 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2222 goto fail;
2223 }
2224
2225 socket_set_state(s, SOCKET_START_POST);
2226 } else
2227 socket_enter_listening(s);
2228
2229 return;
2230
2231 fail:
2232 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2233 }
2234
2235 static void socket_enter_start_chown(Socket *s) {
2236 int r;
2237
2238 assert(s);
2239
2240 r = socket_open_fds(s);
2241 if (r < 0) {
2242 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2243 goto fail;
2244 }
2245
2246 if (!isempty(s->user) || !isempty(s->group)) {
2247
2248 socket_unwatch_control_pid(s);
2249 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2250 s->control_command = NULL;
2251
2252 r = socket_chown(s, &s->control_pid);
2253 if (r < 0) {
2254 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2255 goto fail;
2256 }
2257
2258 socket_set_state(s, SOCKET_START_CHOWN);
2259 } else
2260 socket_enter_start_post(s);
2261
2262 return;
2263
2264 fail:
2265 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2266 }
2267
2268 static void socket_enter_start_pre(Socket *s) {
2269 int r;
2270 assert(s);
2271
2272 socket_unwatch_control_pid(s);
2273
2274 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2275
2276 s->control_command_id = SOCKET_EXEC_START_PRE;
2277 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2278
2279 if (s->control_command) {
2280 r = socket_spawn(s, s->control_command, &s->control_pid);
2281 if (r < 0) {
2282 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2283 goto fail;
2284 }
2285
2286 socket_set_state(s, SOCKET_START_PRE);
2287 } else
2288 socket_enter_start_chown(s);
2289
2290 return;
2291
2292 fail:
2293 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2294 }
2295
2296 static void flush_ports(Socket *s) {
2297 SocketPort *p;
2298
2299 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2300 * anymore */
2301
2302 LIST_FOREACH(port, p, s->ports) {
2303 if (p->fd < 0)
2304 continue;
2305
2306 (void) flush_accept(p->fd);
2307 (void) flush_fd(p->fd);
2308 }
2309 }
2310
2311 static void socket_enter_running(Socket *s, int cfd_in) {
2312 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2313 * somewhere or close it. */
2314 _cleanup_close_ int cfd = cfd_in;
2315
2316 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2317 int r;
2318
2319 assert(s);
2320
2321 /* We don't take connections anymore if we are supposed to shut down anyway */
2322 if (unit_stop_pending(UNIT(s))) {
2323
2324 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2325
2326 if (cfd >= 0)
2327 goto refuse;
2328
2329 flush_ports(s);
2330 return;
2331 }
2332
2333 if (!ratelimit_below(&s->trigger_limit)) {
2334 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2335 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2336 goto refuse;
2337 }
2338
2339 if (cfd < 0) {
2340 bool pending = false;
2341 Unit *other;
2342
2343 /* If there's already a start pending don't bother to do anything */
2344 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2345 if (unit_active_or_pending(other)) {
2346 pending = true;
2347 break;
2348 }
2349
2350 if (!pending) {
2351 if (!UNIT_ISSET(s->service)) {
2352 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2353 "Service to activate vanished, refusing activation.");
2354 goto fail;
2355 }
2356
2357 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2358 if (r < 0)
2359 goto fail;
2360 }
2361
2362 socket_set_state(s, SOCKET_RUNNING);
2363 } else {
2364 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2365 Unit *service;
2366
2367 if (s->n_connections >= s->max_connections) {
2368 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2369 s->n_connections);
2370 goto refuse;
2371 }
2372
2373 if (s->max_connections_per_source > 0) {
2374 r = socket_acquire_peer(s, cfd, &p);
2375 if (ERRNO_IS_DISCONNECT(r))
2376 return;
2377 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2378 goto fail;
2379 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2380 _cleanup_free_ char *t = NULL;
2381
2382 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2383
2384 log_unit_warning(UNIT(s),
2385 "Too many incoming connections (%u) from source %s, dropping connection.",
2386 p->n_ref, strnull(t));
2387 goto refuse;
2388 }
2389 }
2390
2391 r = socket_load_service_unit(s, cfd, &service);
2392 if (ERRNO_IS_DISCONNECT(r))
2393 return;
2394 if (r < 0)
2395 goto fail;
2396
2397 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2398 false, UNIT_DEPENDENCY_IMPLICIT);
2399 if (r < 0)
2400 goto fail;
2401
2402 s->n_accepted++;
2403
2404 r = service_set_socket_fd(SERVICE(service), cfd, s, s->selinux_context_from_net);
2405 if (ERRNO_IS_DISCONNECT(r))
2406 return;
2407 if (r < 0)
2408 goto fail;
2409
2410 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2411 s->n_connections++;
2412
2413 SERVICE(service)->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2414
2415 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2416 if (r < 0) {
2417 /* We failed to activate the new service, but it still exists. Let's make sure the
2418 * service closes and forgets the connection fd again, immediately. */
2419 service_close_socket_fd(SERVICE(service));
2420 goto fail;
2421 }
2422
2423 /* Notify clients about changed counters */
2424 unit_add_to_dbus_queue(UNIT(s));
2425 }
2426
2427 TAKE_FD(cfd);
2428 return;
2429
2430 refuse:
2431 s->n_refused++;
2432 return;
2433
2434 fail:
2435 if (ERRNO_IS_RESOURCE(r))
2436 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2437 bus_error_message(&error, r));
2438 else
2439 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2440 cfd >= 0 ? "template" : "non-template",
2441 bus_error_message(&error, r));
2442
2443 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2444 }
2445
2446 static void socket_run_next(Socket *s) {
2447 int r;
2448
2449 assert(s);
2450 assert(s->control_command);
2451 assert(s->control_command->command_next);
2452
2453 socket_unwatch_control_pid(s);
2454
2455 s->control_command = s->control_command->command_next;
2456
2457 r = socket_spawn(s, s->control_command, &s->control_pid);
2458 if (r < 0)
2459 goto fail;
2460
2461 return;
2462
2463 fail:
2464 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2465
2466 if (s->state == SOCKET_START_POST)
2467 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2468 else if (s->state == SOCKET_STOP_POST)
2469 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2470 else
2471 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2472 }
2473
2474 static int socket_start(Unit *u) {
2475 Socket *s = SOCKET(u);
2476 int r;
2477
2478 assert(s);
2479
2480 /* We cannot fulfill this request right now, try again later
2481 * please! */
2482 if (IN_SET(s->state,
2483 SOCKET_STOP_PRE,
2484 SOCKET_STOP_PRE_SIGKILL,
2485 SOCKET_STOP_PRE_SIGTERM,
2486 SOCKET_STOP_POST,
2487 SOCKET_FINAL_SIGTERM,
2488 SOCKET_FINAL_SIGKILL,
2489 SOCKET_CLEANING))
2490 return -EAGAIN;
2491
2492 /* Already on it! */
2493 if (IN_SET(s->state,
2494 SOCKET_START_PRE,
2495 SOCKET_START_CHOWN,
2496 SOCKET_START_POST))
2497 return 0;
2498
2499 /* Cannot run this without the service being around */
2500 if (UNIT_ISSET(s->service)) {
2501 Service *service;
2502
2503 service = SERVICE(UNIT_DEREF(s->service));
2504
2505 if (UNIT(service)->load_state != UNIT_LOADED)
2506 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2507
2508 /* If the service is already active we cannot start the
2509 * socket */
2510 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
2511 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2512 }
2513
2514 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2515
2516 r = unit_acquire_invocation_id(u);
2517 if (r < 0)
2518 return r;
2519
2520 s->result = SOCKET_SUCCESS;
2521 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2522
2523 u->reset_accounting = true;
2524
2525 socket_enter_start_pre(s);
2526 return 1;
2527 }
2528
2529 static int socket_stop(Unit *u) {
2530 Socket *s = SOCKET(u);
2531
2532 assert(s);
2533
2534 /* Already on it */
2535 if (IN_SET(s->state,
2536 SOCKET_STOP_PRE,
2537 SOCKET_STOP_PRE_SIGTERM,
2538 SOCKET_STOP_PRE_SIGKILL,
2539 SOCKET_STOP_POST,
2540 SOCKET_FINAL_SIGTERM,
2541 SOCKET_FINAL_SIGKILL))
2542 return 0;
2543
2544 /* If there's already something running we go directly into
2545 * kill mode. */
2546 if (IN_SET(s->state,
2547 SOCKET_START_PRE,
2548 SOCKET_START_CHOWN,
2549 SOCKET_START_POST)) {
2550 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2551 return -EAGAIN;
2552 }
2553
2554 /* If we are currently cleaning, then abort it, brutally. */
2555 if (s->state == SOCKET_CLEANING) {
2556 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2557 return 0;
2558 }
2559
2560 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2561
2562 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2563 return 1;
2564 }
2565
2566 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2567 Socket *s = SOCKET(u);
2568 SocketPort *p;
2569 int r;
2570
2571 assert(u);
2572 assert(f);
2573 assert(fds);
2574
2575 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2576 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2577 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2578 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2579
2580 if (s->control_pid > 0)
2581 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2582
2583 if (s->control_command_id >= 0)
2584 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2585
2586 LIST_FOREACH(port, p, s->ports) {
2587 int copy;
2588
2589 if (p->fd < 0)
2590 continue;
2591
2592 copy = fdset_put_dup(fds, p->fd);
2593 if (copy < 0)
2594 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2595
2596 if (p->type == SOCKET_SOCKET) {
2597 _cleanup_free_ char *t = NULL;
2598
2599 r = socket_address_print(&p->address, &t);
2600 if (r < 0)
2601 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2602
2603 if (socket_address_family(&p->address) == AF_NETLINK)
2604 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2605 else
2606 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2607 } else if (p->type == SOCKET_SPECIAL)
2608 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2609 else if (p->type == SOCKET_MQUEUE)
2610 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2611 else if (p->type == SOCKET_USB_FUNCTION)
2612 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2613 else {
2614 assert(p->type == SOCKET_FIFO);
2615 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2616 }
2617 }
2618
2619 return 0;
2620 }
2621
2622 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2623 Socket *s = SOCKET(u);
2624
2625 assert(u);
2626 assert(key);
2627 assert(value);
2628
2629 if (streq(key, "state")) {
2630 SocketState state;
2631
2632 state = socket_state_from_string(value);
2633 if (state < 0)
2634 log_unit_debug(u, "Failed to parse state value: %s", value);
2635 else
2636 s->deserialized_state = state;
2637 } else if (streq(key, "result")) {
2638 SocketResult f;
2639
2640 f = socket_result_from_string(value);
2641 if (f < 0)
2642 log_unit_debug(u, "Failed to parse result value: %s", value);
2643 else if (f != SOCKET_SUCCESS)
2644 s->result = f;
2645
2646 } else if (streq(key, "n-accepted")) {
2647 unsigned k;
2648
2649 if (safe_atou(value, &k) < 0)
2650 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2651 else
2652 s->n_accepted += k;
2653 } else if (streq(key, "n-refused")) {
2654 unsigned k;
2655
2656 if (safe_atou(value, &k) < 0)
2657 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2658 else
2659 s->n_refused += k;
2660 } else if (streq(key, "control-pid")) {
2661 pid_t pid;
2662
2663 if (parse_pid(value, &pid) < 0)
2664 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2665 else
2666 s->control_pid = pid;
2667 } else if (streq(key, "control-command")) {
2668 SocketExecCommand id;
2669
2670 id = socket_exec_command_from_string(value);
2671 if (id < 0)
2672 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2673 else {
2674 s->control_command_id = id;
2675 s->control_command = s->exec_command[id];
2676 }
2677 } else if (streq(key, "fifo")) {
2678 int fd, skip = 0;
2679 SocketPort *p;
2680
2681 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2682 log_unit_debug(u, "Failed to parse fifo 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_FIFO &&
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 fifo socket found: %s", value+skip);
2696 }
2697
2698 } else if (streq(key, "special")) {
2699 int fd, skip = 0;
2700 SocketPort *p;
2701
2702 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2703 log_unit_debug(u, "Failed to parse special value: %s", value);
2704 else {
2705 bool found = false;
2706
2707 LIST_FOREACH(port, p, s->ports)
2708 if (p->fd < 0 &&
2709 p->type == SOCKET_SPECIAL &&
2710 path_equal_or_files_same(p->path, value+skip, 0)) {
2711 p->fd = fdset_remove(fds, fd);
2712 found = true;
2713 break;
2714 }
2715 if (!found)
2716 log_unit_debug(u, "No matching special socket found: %s", value+skip);
2717 }
2718
2719 } else if (streq(key, "mqueue")) {
2720 int fd, skip = 0;
2721 SocketPort *p;
2722
2723 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2724 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2725 else {
2726 bool found = false;
2727
2728 LIST_FOREACH(port, p, s->ports)
2729 if (p->fd < 0 &&
2730 p->type == SOCKET_MQUEUE &&
2731 streq(p->path, value+skip)) {
2732 p->fd = fdset_remove(fds, fd);
2733 found = true;
2734 break;
2735 }
2736 if (!found)
2737 log_unit_debug(u, "No matching mqueue socket found: %s", value+skip);
2738 }
2739
2740 } else if (streq(key, "socket")) {
2741 int fd, type, skip = 0;
2742 SocketPort *p;
2743
2744 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2745 log_unit_debug(u, "Failed to parse socket value: %s", value);
2746 else {
2747 bool found = false;
2748
2749 LIST_FOREACH(port, p, s->ports)
2750 if (p->fd < 0 &&
2751 socket_address_is(&p->address, value+skip, type)) {
2752 p->fd = fdset_remove(fds, fd);
2753 found = true;
2754 break;
2755 }
2756 if (!found)
2757 log_unit_debug(u, "No matching %s socket found: %s",
2758 socket_address_type_to_string(type), value+skip);
2759 }
2760
2761 } else if (streq(key, "netlink")) {
2762 int fd, skip = 0;
2763 SocketPort *p;
2764
2765 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2766 log_unit_debug(u, "Failed to parse socket value: %s", value);
2767 else {
2768 bool found = false;
2769
2770 LIST_FOREACH(port, p, s->ports)
2771 if (p->fd < 0 &&
2772 socket_address_is_netlink(&p->address, value+skip)) {
2773 p->fd = fdset_remove(fds, fd);
2774 found = true;
2775 break;
2776 }
2777 if (!found)
2778 log_unit_debug(u, "No matching netlink socket found: %s", value+skip);
2779 }
2780
2781 } else if (streq(key, "ffs")) {
2782 int fd, skip = 0;
2783 SocketPort *p;
2784
2785 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2786 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2787 else {
2788 bool found = false;
2789
2790 LIST_FOREACH(port, p, s->ports)
2791 if (p->fd < 0 &&
2792 p->type == SOCKET_USB_FUNCTION &&
2793 path_equal_or_files_same(p->path, value+skip, 0)) {
2794 p->fd = fdset_remove(fds, fd);
2795 found = true;
2796 break;
2797 }
2798 if (!found)
2799 log_unit_debug(u, "No matching ffs socket found: %s", value+skip);
2800 }
2801
2802 } else
2803 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2804
2805 return 0;
2806 }
2807
2808 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2809 Socket *s = SOCKET(u);
2810 SocketPort *p;
2811
2812 assert(u);
2813
2814 LIST_FOREACH(port, p, s->ports) {
2815 int fd;
2816
2817 if (p->type != SOCKET_SOCKET)
2818 continue;
2819
2820 if (p->fd >= 0)
2821 continue;
2822
2823 FDSET_FOREACH(fd, fds) {
2824 if (socket_address_matches_fd(&p->address, fd)) {
2825 p->fd = fdset_remove(fds, fd);
2826 s->deserialized_state = SOCKET_LISTENING;
2827 break;
2828 }
2829 }
2830 }
2831 }
2832
2833 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2834 assert(u);
2835
2836 return state_translation_table[SOCKET(u)->state];
2837 }
2838
2839 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2840 assert(u);
2841
2842 return socket_state_to_string(SOCKET(u)->state);
2843 }
2844
2845 const char* socket_port_type_to_string(SocketPort *p) {
2846
2847 assert(p);
2848
2849 switch (p->type) {
2850
2851 case SOCKET_SOCKET:
2852
2853 switch (p->address.type) {
2854
2855 case SOCK_STREAM:
2856 return "Stream";
2857
2858 case SOCK_DGRAM:
2859 return "Datagram";
2860
2861 case SOCK_SEQPACKET:
2862 return "SequentialPacket";
2863
2864 case SOCK_RAW:
2865 if (socket_address_family(&p->address) == AF_NETLINK)
2866 return "Netlink";
2867
2868 _fallthrough_;
2869 default:
2870 return NULL;
2871 }
2872
2873 case SOCKET_SPECIAL:
2874 return "Special";
2875
2876 case SOCKET_MQUEUE:
2877 return "MessageQueue";
2878
2879 case SOCKET_FIFO:
2880 return "FIFO";
2881
2882 case SOCKET_USB_FUNCTION:
2883 return "USBFunction";
2884
2885 default:
2886 return NULL;
2887 }
2888 }
2889
2890 SocketType socket_port_type_from_string(const char *s) {
2891 assert(s);
2892
2893 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2894 return SOCKET_SOCKET;
2895 else if (streq(s, "Special"))
2896 return SOCKET_SPECIAL;
2897 else if (streq(s, "MessageQueue"))
2898 return SOCKET_MQUEUE;
2899 else if (streq(s, "FIFO"))
2900 return SOCKET_FIFO;
2901 else if (streq(s, "USBFunction"))
2902 return SOCKET_USB_FUNCTION;
2903 else
2904 return _SOCKET_TYPE_INVALID;
2905 }
2906
2907 _pure_ static bool socket_may_gc(Unit *u) {
2908 Socket *s = SOCKET(u);
2909
2910 assert(u);
2911
2912 return s->n_connections == 0;
2913 }
2914
2915 static int socket_accept_do(Socket *s, int fd) {
2916 int cfd;
2917
2918 assert(s);
2919 assert(fd >= 0);
2920
2921 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2922 if (cfd < 0)
2923 /* Convert transient network errors into clean and well-defined EAGAIN */
2924 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2925
2926 return cfd;
2927 }
2928
2929 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2930 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2931 int cfd, r;
2932 pid_t pid;
2933
2934 assert(s);
2935 assert(p);
2936 assert(fd >= 0);
2937
2938 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2939 * connection socket is also properly associated with the cgroup. */
2940
2941 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2942 goto shortcut;
2943
2944 r = bpf_firewall_supported();
2945 if (r < 0)
2946 return r;
2947 if (r == BPF_FIREWALL_UNSUPPORTED)
2948 goto shortcut;
2949
2950 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2951 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2952
2953 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2954 if (r < 0)
2955 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2956 if (r == 0) {
2957 /* Child */
2958
2959 pair[0] = safe_close(pair[0]);
2960
2961 cfd = socket_accept_do(s, fd);
2962 if (cfd == -EAGAIN) /* spurious accept() */
2963 _exit(EXIT_SUCCESS);
2964 if (cfd < 0) {
2965 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2966 _exit(EXIT_FAILURE);
2967 }
2968
2969 r = send_one_fd(pair[1], cfd, 0);
2970 if (r < 0) {
2971 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2972 _exit(EXIT_FAILURE);
2973 }
2974
2975 _exit(EXIT_SUCCESS);
2976 }
2977
2978 pair[1] = safe_close(pair[1]);
2979 cfd = receive_one_fd(pair[0], 0);
2980
2981 /* We synchronously wait for the helper, as it shouldn't be slow */
2982 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2983 if (r < 0) {
2984 safe_close(cfd);
2985 return r;
2986 }
2987
2988 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
2989 * this is a spurious accept(), let's convert that back to EAGAIN here. */
2990 if (cfd == -EIO)
2991 return -EAGAIN;
2992 if (cfd < 0)
2993 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2994
2995 return cfd;
2996
2997 shortcut:
2998 cfd = socket_accept_do(s, fd);
2999 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3000 return -EAGAIN;
3001 if (cfd < 0)
3002 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3003
3004 return cfd;
3005 }
3006
3007 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3008 SocketPort *p = userdata;
3009 int cfd = -1;
3010
3011 assert(p);
3012 assert(fd >= 0);
3013
3014 if (p->socket->state != SOCKET_LISTENING)
3015 return 0;
3016
3017 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3018
3019 if (revents != EPOLLIN) {
3020 if (revents & EPOLLHUP)
3021 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.");
3022 else
3023 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3024 goto fail;
3025 }
3026
3027 if (p->socket->accept &&
3028 p->type == SOCKET_SOCKET &&
3029 socket_address_can_accept(&p->address)) {
3030
3031 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3032 if (cfd == -EAGAIN) /* Spurious accept() */
3033 return 0;
3034 if (cfd < 0)
3035 goto fail;
3036
3037 socket_apply_socket_options(p->socket, p, cfd);
3038 }
3039
3040 socket_enter_running(p->socket, cfd);
3041 return 0;
3042
3043 fail:
3044 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3045 return 0;
3046 }
3047
3048 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3049 Socket *s = SOCKET(u);
3050 SocketResult f;
3051
3052 assert(s);
3053 assert(pid >= 0);
3054
3055 if (pid != s->control_pid)
3056 return;
3057
3058 s->control_pid = 0;
3059
3060 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3061 f = SOCKET_SUCCESS;
3062 else if (code == CLD_EXITED)
3063 f = SOCKET_FAILURE_EXIT_CODE;
3064 else if (code == CLD_KILLED)
3065 f = SOCKET_FAILURE_SIGNAL;
3066 else if (code == CLD_DUMPED)
3067 f = SOCKET_FAILURE_CORE_DUMP;
3068 else
3069 assert_not_reached();
3070
3071 if (s->control_command) {
3072 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3073
3074 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3075 f = SOCKET_SUCCESS;
3076 }
3077
3078 unit_log_process_exit(
3079 u,
3080 "Control process",
3081 socket_exec_command_to_string(s->control_command_id),
3082 f == SOCKET_SUCCESS,
3083 code, status);
3084
3085 if (s->result == SOCKET_SUCCESS)
3086 s->result = f;
3087
3088 if (s->control_command &&
3089 s->control_command->command_next &&
3090 f == SOCKET_SUCCESS) {
3091
3092 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3093 socket_run_next(s);
3094 } else {
3095 s->control_command = NULL;
3096 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3097
3098 /* No further commands for this step, so let's figure
3099 * out what to do next */
3100
3101 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3102
3103 switch (s->state) {
3104
3105 case SOCKET_START_PRE:
3106 if (f == SOCKET_SUCCESS)
3107 socket_enter_start_chown(s);
3108 else
3109 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3110 break;
3111
3112 case SOCKET_START_CHOWN:
3113 if (f == SOCKET_SUCCESS)
3114 socket_enter_start_post(s);
3115 else
3116 socket_enter_stop_pre(s, f);
3117 break;
3118
3119 case SOCKET_START_POST:
3120 if (f == SOCKET_SUCCESS)
3121 socket_enter_listening(s);
3122 else
3123 socket_enter_stop_pre(s, f);
3124 break;
3125
3126 case SOCKET_STOP_PRE:
3127 case SOCKET_STOP_PRE_SIGTERM:
3128 case SOCKET_STOP_PRE_SIGKILL:
3129 socket_enter_stop_post(s, f);
3130 break;
3131
3132 case SOCKET_STOP_POST:
3133 case SOCKET_FINAL_SIGTERM:
3134 case SOCKET_FINAL_SIGKILL:
3135 socket_enter_dead(s, f);
3136 break;
3137
3138 case SOCKET_CLEANING:
3139
3140 if (s->clean_result == SOCKET_SUCCESS)
3141 s->clean_result = f;
3142
3143 socket_enter_dead(s, SOCKET_SUCCESS);
3144 break;
3145
3146 default:
3147 assert_not_reached();
3148 }
3149 }
3150
3151 /* Notify clients about changed exit status */
3152 unit_add_to_dbus_queue(u);
3153 }
3154
3155 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3156 Socket *s = SOCKET(userdata);
3157
3158 assert(s);
3159 assert(s->timer_event_source == source);
3160
3161 switch (s->state) {
3162
3163 case SOCKET_START_PRE:
3164 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3165 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3166 break;
3167
3168 case SOCKET_START_CHOWN:
3169 case SOCKET_START_POST:
3170 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3171 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3172 break;
3173
3174 case SOCKET_STOP_PRE:
3175 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3176 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3177 break;
3178
3179 case SOCKET_STOP_PRE_SIGTERM:
3180 if (s->kill_context.send_sigkill) {
3181 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3182 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3183 } else {
3184 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3185 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3186 }
3187 break;
3188
3189 case SOCKET_STOP_PRE_SIGKILL:
3190 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3191 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3192 break;
3193
3194 case SOCKET_STOP_POST:
3195 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3196 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3197 break;
3198
3199 case SOCKET_FINAL_SIGTERM:
3200 if (s->kill_context.send_sigkill) {
3201 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3202 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3203 } else {
3204 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3205 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3206 }
3207 break;
3208
3209 case SOCKET_FINAL_SIGKILL:
3210 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3211 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3212 break;
3213
3214 case SOCKET_CLEANING:
3215 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3216
3217 if (s->clean_result == SOCKET_SUCCESS)
3218 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3219
3220 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3221 break;
3222
3223 default:
3224 assert_not_reached();
3225 }
3226
3227 return 0;
3228 }
3229
3230 int socket_collect_fds(Socket *s, int **fds) {
3231 size_t k = 0, n = 0;
3232 SocketPort *p;
3233 int *rfds;
3234
3235 assert(s);
3236 assert(fds);
3237
3238 /* Called from the service code for requesting our fds */
3239
3240 LIST_FOREACH(port, p, s->ports) {
3241 if (p->fd >= 0)
3242 n++;
3243 n += p->n_auxiliary_fds;
3244 }
3245
3246 if (n <= 0) {
3247 *fds = NULL;
3248 return 0;
3249 }
3250
3251 rfds = new(int, n);
3252 if (!rfds)
3253 return -ENOMEM;
3254
3255 LIST_FOREACH(port, p, s->ports) {
3256 if (p->fd >= 0)
3257 rfds[k++] = p->fd;
3258 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3259 rfds[k++] = p->auxiliary_fds[i];
3260 }
3261
3262 assert(k == n);
3263
3264 *fds = rfds;
3265 return (int) n;
3266 }
3267
3268 static void socket_reset_failed(Unit *u) {
3269 Socket *s = SOCKET(u);
3270
3271 assert(s);
3272
3273 if (s->state == SOCKET_FAILED)
3274 socket_set_state(s, SOCKET_DEAD);
3275
3276 s->result = SOCKET_SUCCESS;
3277 s->clean_result = SOCKET_SUCCESS;
3278 }
3279
3280 void socket_connection_unref(Socket *s) {
3281 assert(s);
3282
3283 /* The service is dead. Yay!
3284 *
3285 * This is strictly for one-instance-per-connection
3286 * services. */
3287
3288 assert(s->n_connections > 0);
3289 s->n_connections--;
3290
3291 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3292 }
3293
3294 static void socket_trigger_notify(Unit *u, Unit *other) {
3295 Socket *s = SOCKET(u);
3296
3297 assert(u);
3298 assert(other);
3299
3300 /* Filter out invocations with bogus state */
3301 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3302 assert(other->type == UNIT_SERVICE);
3303
3304 /* Don't propagate state changes from the service if we are already down */
3305 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3306 return;
3307
3308 /* We don't care for the service state if we are in Accept=yes mode */
3309 if (s->accept)
3310 return;
3311
3312 /* Propagate start limit hit state */
3313 if (other->start_limit_hit) {
3314 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3315 return;
3316 }
3317
3318 /* Don't propagate anything if there's still a job queued */
3319 if (other->job)
3320 return;
3321
3322 if (IN_SET(SERVICE(other)->state,
3323 SERVICE_DEAD, SERVICE_FAILED,
3324 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3325 SERVICE_AUTO_RESTART))
3326 socket_enter_listening(s);
3327
3328 if (SERVICE(other)->state == SERVICE_RUNNING)
3329 socket_set_state(s, SOCKET_RUNNING);
3330 }
3331
3332 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3333 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3334 }
3335
3336 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3337 Socket *s = SOCKET(u);
3338 usec_t t;
3339 int r;
3340
3341 if (!s->timer_event_source)
3342 return 0;
3343
3344 r = sd_event_source_get_time(s->timer_event_source, &t);
3345 if (r < 0)
3346 return r;
3347 if (t == USEC_INFINITY)
3348 return 0;
3349
3350 *timeout = t;
3351 return 1;
3352 }
3353
3354 char *socket_fdname(Socket *s) {
3355 assert(s);
3356
3357 /* Returns the name to use for $LISTEN_NAMES. If the user
3358 * didn't specify anything specifically, use the socket unit's
3359 * name as fallback. */
3360
3361 return s->fdname ?: UNIT(s)->id;
3362 }
3363
3364 static int socket_control_pid(Unit *u) {
3365 Socket *s = SOCKET(u);
3366
3367 assert(s);
3368
3369 return s->control_pid;
3370 }
3371
3372 static int socket_clean(Unit *u, ExecCleanMask mask) {
3373 _cleanup_strv_free_ char **l = NULL;
3374 Socket *s = SOCKET(u);
3375 int r;
3376
3377 assert(s);
3378 assert(mask != 0);
3379
3380 if (s->state != SOCKET_DEAD)
3381 return -EBUSY;
3382
3383 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3384 if (r < 0)
3385 return r;
3386
3387 if (strv_isempty(l))
3388 return -EUNATCH;
3389
3390 socket_unwatch_control_pid(s);
3391 s->clean_result = SOCKET_SUCCESS;
3392 s->control_command = NULL;
3393 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3394
3395 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3396 if (r < 0)
3397 goto fail;
3398
3399 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3400 if (r < 0)
3401 goto fail;
3402
3403 socket_set_state(s, SOCKET_CLEANING);
3404
3405 return 0;
3406
3407 fail:
3408 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3409 s->clean_result = SOCKET_FAILURE_RESOURCES;
3410 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3411 return r;
3412 }
3413
3414 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3415 Socket *s = SOCKET(u);
3416
3417 assert(s);
3418
3419 return exec_context_get_clean_mask(&s->exec_context, ret);
3420 }
3421
3422 static int socket_test_start_limit(Unit *u) {
3423 Socket *s = SOCKET(u);
3424 int r;
3425
3426 assert(s);
3427
3428 r = unit_test_start_limit(u);
3429 if (r < 0) {
3430 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3431 return r;
3432 }
3433
3434 return 0;
3435 }
3436
3437 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3438 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3439 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3440 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3441 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3442 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3443 };
3444
3445 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3446
3447 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3448 [SOCKET_SUCCESS] = "success",
3449 [SOCKET_FAILURE_RESOURCES] = "resources",
3450 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3451 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3452 [SOCKET_FAILURE_SIGNAL] = "signal",
3453 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3454 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3455 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3456 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3457 };
3458
3459 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3460
3461 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3462 [SOCKET_TIMESTAMPING_OFF] = "off",
3463 [SOCKET_TIMESTAMPING_US] = "us",
3464 [SOCKET_TIMESTAMPING_NS] = "ns",
3465 };
3466
3467 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3468
3469 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3470 SocketTimestamping t;
3471 int r;
3472
3473 if (!p)
3474 return _SOCKET_TIMESTAMPING_INVALID;
3475
3476 t = socket_timestamping_from_string(p);
3477 if (t >= 0)
3478 return t;
3479
3480 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3481 * too. */
3482 if (streq(p, "nsec"))
3483 return SOCKET_TIMESTAMPING_NS;
3484 if (STR_IN_SET(p, "usec", "µs"))
3485 return SOCKET_TIMESTAMPING_US;
3486
3487 r = parse_boolean(p);
3488 if (r < 0)
3489 return _SOCKET_TIMESTAMPING_INVALID;
3490
3491 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3492 }
3493
3494 const UnitVTable socket_vtable = {
3495 .object_size = sizeof(Socket),
3496 .exec_context_offset = offsetof(Socket, exec_context),
3497 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3498 .kill_context_offset = offsetof(Socket, kill_context),
3499 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3500 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3501
3502 .sections =
3503 "Unit\0"
3504 "Socket\0"
3505 "Install\0",
3506 .private_section = "Socket",
3507
3508 .can_transient = true,
3509 .can_trigger = true,
3510 .can_fail = true,
3511
3512 .init = socket_init,
3513 .done = socket_done,
3514 .load = socket_load,
3515
3516 .coldplug = socket_coldplug,
3517
3518 .dump = socket_dump,
3519
3520 .start = socket_start,
3521 .stop = socket_stop,
3522
3523 .kill = socket_kill,
3524 .clean = socket_clean,
3525 .can_clean = socket_can_clean,
3526
3527 .get_timeout = socket_get_timeout,
3528
3529 .serialize = socket_serialize,
3530 .deserialize_item = socket_deserialize_item,
3531 .distribute_fds = socket_distribute_fds,
3532
3533 .active_state = socket_active_state,
3534 .sub_state_to_string = socket_sub_state_to_string,
3535
3536 .will_restart = unit_will_restart_default,
3537
3538 .may_gc = socket_may_gc,
3539
3540 .sigchld_event = socket_sigchld_event,
3541
3542 .trigger_notify = socket_trigger_notify,
3543
3544 .reset_failed = socket_reset_failed,
3545
3546 .control_pid = socket_control_pid,
3547
3548 .bus_set_property = bus_socket_set_property,
3549 .bus_commit_properties = bus_socket_commit_properties,
3550
3551 .status_message_formats = {
3552 .finished_start_job = {
3553 [JOB_DONE] = "Listening on %s.",
3554 [JOB_FAILED] = "Failed to listen on %s.",
3555 [JOB_TIMEOUT] = "Timed out starting %s.",
3556 },
3557 .finished_stop_job = {
3558 [JOB_DONE] = "Closed %s.",
3559 [JOB_FAILED] = "Failed stopping %s.",
3560 [JOB_TIMEOUT] = "Timed out stopping %s.",
3561 },
3562 },
3563
3564 .test_start_limit = socket_test_start_limit,
3565 };
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