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Merge pull request #27173 from yuwata/update-utmp
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase.h"
18 #include "constants.h"
19 #include "copy.h"
20 #include "dbus-socket.h"
21 #include "dbus-unit.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = UINT_MAX;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid));
113 }
114
115 static void socket_cleanup_fd_list(SocketPort *p) {
116 assert(p);
117
118 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
119 p->auxiliary_fds = mfree(p->auxiliary_fds);
120 p->n_auxiliary_fds = 0;
121 }
122
123 void socket_free_ports(Socket *s) {
124 SocketPort *p;
125
126 assert(s);
127
128 while ((p = s->ports)) {
129 LIST_REMOVE(port, s->ports, p);
130
131 sd_event_source_unref(p->event_source);
132
133 socket_cleanup_fd_list(p);
134 safe_close(p->fd);
135 free(p->path);
136 free(p);
137 }
138 }
139
140 static void socket_done(Unit *u) {
141 Socket *s = SOCKET(u);
142 SocketPeer *p;
143
144 assert(s);
145
146 socket_free_ports(s);
147
148 while ((p = set_steal_first(s->peers_by_address)))
149 p->socket = NULL;
150
151 s->peers_by_address = set_free(s->peers_by_address);
152
153 s->exec_runtime = exec_runtime_free(s->exec_runtime);
154 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
155 s->control_command = NULL;
156
157 socket_unwatch_control_pid(s);
158
159 unit_ref_unset(&s->service);
160
161 s->tcp_congestion = mfree(s->tcp_congestion);
162 s->bind_to_device = mfree(s->bind_to_device);
163
164 s->smack = mfree(s->smack);
165 s->smack_ip_in = mfree(s->smack_ip_in);
166 s->smack_ip_out = mfree(s->smack_ip_out);
167
168 strv_free(s->symlinks);
169
170 s->user = mfree(s->user);
171 s->group = mfree(s->group);
172
173 s->fdname = mfree(s->fdname);
174
175 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
176 }
177
178 static int socket_arm_timer(Socket *s, usec_t usec) {
179 int r;
180
181 assert(s);
182
183 if (s->timer_event_source) {
184 r = sd_event_source_set_time(s->timer_event_source, usec);
185 if (r < 0)
186 return r;
187
188 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
189 }
190
191 if (usec == USEC_INFINITY)
192 return 0;
193
194 r = sd_event_add_time(
195 UNIT(s)->manager->event,
196 &s->timer_event_source,
197 CLOCK_MONOTONIC,
198 usec, 0,
199 socket_dispatch_timer, s);
200 if (r < 0)
201 return r;
202
203 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
204
205 return 0;
206 }
207
208 static bool have_non_accept_socket(Socket *s) {
209 assert(s);
210
211 if (!s->accept)
212 return true;
213
214 LIST_FOREACH(port, p, s->ports) {
215
216 if (p->type != SOCKET_SOCKET)
217 return true;
218
219 if (!socket_address_can_accept(&p->address))
220 return true;
221 }
222
223 return false;
224 }
225
226 static int socket_add_mount_dependencies(Socket *s) {
227 int r;
228
229 assert(s);
230
231 LIST_FOREACH(port, p, s->ports) {
232 const char *path = NULL;
233
234 if (p->type == SOCKET_SOCKET)
235 path = socket_address_get_path(&p->address);
236 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
237 path = p->path;
238
239 if (!path)
240 continue;
241
242 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
243 if (r < 0)
244 return r;
245 }
246
247 return 0;
248 }
249
250 static int socket_add_device_dependencies(Socket *s) {
251 char *t;
252
253 assert(s);
254
255 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
256 return 0;
257
258 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
259 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
260 }
261
262 static int socket_add_default_dependencies(Socket *s) {
263 int r;
264 assert(s);
265
266 if (!UNIT(s)->default_dependencies)
267 return 0;
268
269 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
270 if (r < 0)
271 return r;
272
273 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
274 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
275 if (r < 0)
276 return r;
277 }
278
279 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
280 if (r < 0)
281 return r;
282
283 return exec_context_add_default_dependencies(UNIT(s), &s->exec_context);
284 }
285
286 _pure_ static bool socket_has_exec(Socket *s) {
287 unsigned i;
288 assert(s);
289
290 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
291 if (s->exec_command[i])
292 return true;
293
294 return false;
295 }
296
297 static int socket_add_extras(Socket *s) {
298 Unit *u = UNIT(s);
299 int r;
300
301 assert(s);
302
303 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
304 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
305 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
306 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
307 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
308 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
309 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
310 * service starts are typical. */
311
312 if (s->trigger_limit.interval == USEC_INFINITY)
313 s->trigger_limit.interval = 2 * USEC_PER_SEC;
314
315 if (s->trigger_limit.burst == UINT_MAX) {
316 if (s->accept)
317 s->trigger_limit.burst = 200;
318 else
319 s->trigger_limit.burst = 20;
320 }
321
322 if (have_non_accept_socket(s)) {
323
324 if (!UNIT_DEREF(s->service)) {
325 Unit *x;
326
327 r = unit_load_related_unit(u, ".service", &x);
328 if (r < 0)
329 return r;
330
331 unit_ref_set(&s->service, u, x);
332 }
333
334 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
335 if (r < 0)
336 return r;
337 }
338
339 r = socket_add_mount_dependencies(s);
340 if (r < 0)
341 return r;
342
343 r = socket_add_device_dependencies(s);
344 if (r < 0)
345 return r;
346
347 r = unit_patch_contexts(u);
348 if (r < 0)
349 return r;
350
351 if (socket_has_exec(s)) {
352 r = unit_add_exec_dependencies(u, &s->exec_context);
353 if (r < 0)
354 return r;
355 }
356
357 r = unit_set_default_slice(u);
358 if (r < 0)
359 return r;
360
361 r = socket_add_default_dependencies(s);
362 if (r < 0)
363 return r;
364
365 return 0;
366 }
367
368 static const char *socket_find_symlink_target(Socket *s) {
369 const char *found = NULL;
370
371 LIST_FOREACH(port, p, s->ports) {
372 const char *f = NULL;
373
374 switch (p->type) {
375
376 case SOCKET_FIFO:
377 f = p->path;
378 break;
379
380 case SOCKET_SOCKET:
381 f = socket_address_get_path(&p->address);
382 break;
383
384 default:
385 break;
386 }
387
388 if (f) {
389 if (found)
390 return NULL;
391
392 found = f;
393 }
394 }
395
396 return found;
397 }
398
399 static int socket_verify(Socket *s) {
400 assert(s);
401 assert(UNIT(s)->load_state == UNIT_LOADED);
402
403 if (!s->ports)
404 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
405
406 if (s->accept && have_non_accept_socket(s))
407 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
408
409 if (s->accept && s->max_connections <= 0)
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
411
412 if (s->accept && UNIT_DEREF(s->service))
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
414
415 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
417
418 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
419 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.");
420
421 return 0;
422 }
423
424 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
425 assert(s);
426
427 if (s->peer.sa.sa_family == AF_INET)
428 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
429 else if (s->peer.sa.sa_family == AF_INET6)
430 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
431 else if (s->peer.sa.sa_family == AF_VSOCK)
432 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
433 else
434 assert_not_reached();
435 }
436
437 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
438 int r;
439
440 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
441 if (r != 0)
442 return r;
443
444 switch (x->peer.sa.sa_family) {
445 case AF_INET:
446 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
447 case AF_INET6:
448 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
449 case AF_VSOCK:
450 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
451 }
452 assert_not_reached();
453 }
454
455 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
456
457 static int socket_load(Unit *u) {
458 Socket *s = SOCKET(u);
459 int r;
460
461 assert(u);
462 assert(u->load_state == UNIT_STUB);
463
464 r = unit_load_fragment_and_dropin(u, true);
465 if (r < 0)
466 return r;
467
468 if (u->load_state != UNIT_LOADED)
469 return 0;
470
471 /* This is a new unit? Then let's add in some extras */
472 r = socket_add_extras(s);
473 if (r < 0)
474 return r;
475
476 return socket_verify(s);
477 }
478
479 static SocketPeer *socket_peer_new(void) {
480 SocketPeer *p;
481
482 p = new(SocketPeer, 1);
483 if (!p)
484 return NULL;
485
486 *p = (SocketPeer) {
487 .n_ref = 1,
488 };
489 return p;
490 }
491
492 static SocketPeer *socket_peer_free(SocketPeer *p) {
493 assert(p);
494
495 if (p->socket)
496 set_remove(p->socket->peers_by_address, p);
497
498 return mfree(p);
499 }
500
501 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
502
503 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
504 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
505 SocketPeer sa = {
506 .peer_salen = sizeof(union sockaddr_union),
507 }, *i;
508 int r;
509
510 assert(fd >= 0);
511 assert(s);
512
513 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
514 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
515
516 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
517 *p = NULL;
518 return 0;
519 }
520
521 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
522 if (r < 0)
523 return r;
524
525 i = set_get(s->peers_by_address, &sa);
526 if (i) {
527 *p = socket_peer_ref(i);
528 return 1;
529 }
530
531 remote = socket_peer_new();
532 if (!remote)
533 return log_oom();
534
535 remote->peer = sa.peer;
536 remote->peer_salen = sa.peer_salen;
537
538 r = set_put(s->peers_by_address, remote);
539 if (r < 0)
540 return r;
541
542 remote->socket = s;
543
544 *p = TAKE_PTR(remote);
545 return 1;
546 }
547
548 _const_ static const char* listen_lookup(int family, int type) {
549
550 if (family == AF_NETLINK)
551 return "ListenNetlink";
552
553 if (type == SOCK_STREAM)
554 return "ListenStream";
555 else if (type == SOCK_DGRAM)
556 return "ListenDatagram";
557 else if (type == SOCK_SEQPACKET)
558 return "ListenSequentialPacket";
559
560 assert_not_reached();
561 return NULL;
562 }
563
564 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
565 Socket *s = SOCKET(u);
566 const char *prefix2, *str;
567
568 assert(s);
569 assert(f);
570
571 prefix = strempty(prefix);
572 prefix2 = strjoina(prefix, "\t");
573
574 fprintf(f,
575 "%sSocket State: %s\n"
576 "%sResult: %s\n"
577 "%sClean Result: %s\n"
578 "%sBindIPv6Only: %s\n"
579 "%sBacklog: %u\n"
580 "%sSocketMode: %04o\n"
581 "%sDirectoryMode: %04o\n"
582 "%sKeepAlive: %s\n"
583 "%sNoDelay: %s\n"
584 "%sFreeBind: %s\n"
585 "%sTransparent: %s\n"
586 "%sBroadcast: %s\n"
587 "%sPassCredentials: %s\n"
588 "%sPassSecurity: %s\n"
589 "%sPassPacketInfo: %s\n"
590 "%sTCPCongestion: %s\n"
591 "%sRemoveOnStop: %s\n"
592 "%sWritable: %s\n"
593 "%sFileDescriptorName: %s\n"
594 "%sSELinuxContextFromNet: %s\n",
595 prefix, socket_state_to_string(s->state),
596 prefix, socket_result_to_string(s->result),
597 prefix, socket_result_to_string(s->clean_result),
598 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
599 prefix, s->backlog,
600 prefix, s->socket_mode,
601 prefix, s->directory_mode,
602 prefix, yes_no(s->keep_alive),
603 prefix, yes_no(s->no_delay),
604 prefix, yes_no(s->free_bind),
605 prefix, yes_no(s->transparent),
606 prefix, yes_no(s->broadcast),
607 prefix, yes_no(s->pass_cred),
608 prefix, yes_no(s->pass_sec),
609 prefix, yes_no(s->pass_pktinfo),
610 prefix, strna(s->tcp_congestion),
611 prefix, yes_no(s->remove_on_stop),
612 prefix, yes_no(s->writable),
613 prefix, socket_fdname(s),
614 prefix, yes_no(s->selinux_context_from_net));
615
616 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
617 fprintf(f,
618 "%sTimestamping: %s\n",
619 prefix, socket_timestamping_to_string(s->timestamping));
620
621 if (s->control_pid > 0)
622 fprintf(f,
623 "%sControl PID: "PID_FMT"\n",
624 prefix, s->control_pid);
625
626 if (s->bind_to_device)
627 fprintf(f,
628 "%sBindToDevice: %s\n",
629 prefix, s->bind_to_device);
630
631 if (s->accept)
632 fprintf(f,
633 "%sAccepted: %u\n"
634 "%sNConnections: %u\n"
635 "%sMaxConnections: %u\n"
636 "%sMaxConnectionsPerSource: %u\n",
637 prefix, s->n_accepted,
638 prefix, s->n_connections,
639 prefix, s->max_connections,
640 prefix, s->max_connections_per_source);
641 else
642 fprintf(f,
643 "%sFlushPending: %s\n",
644 prefix, yes_no(s->flush_pending));
645
646
647 if (s->priority >= 0)
648 fprintf(f,
649 "%sPriority: %i\n",
650 prefix, s->priority);
651
652 if (s->receive_buffer > 0)
653 fprintf(f,
654 "%sReceiveBuffer: %zu\n",
655 prefix, s->receive_buffer);
656
657 if (s->send_buffer > 0)
658 fprintf(f,
659 "%sSendBuffer: %zu\n",
660 prefix, s->send_buffer);
661
662 if (s->ip_tos >= 0)
663 fprintf(f,
664 "%sIPTOS: %i\n",
665 prefix, s->ip_tos);
666
667 if (s->ip_ttl >= 0)
668 fprintf(f,
669 "%sIPTTL: %i\n",
670 prefix, s->ip_ttl);
671
672 if (s->pipe_size > 0)
673 fprintf(f,
674 "%sPipeSize: %zu\n",
675 prefix, s->pipe_size);
676
677 if (s->mark >= 0)
678 fprintf(f,
679 "%sMark: %i\n",
680 prefix, s->mark);
681
682 if (s->mq_maxmsg > 0)
683 fprintf(f,
684 "%sMessageQueueMaxMessages: %li\n",
685 prefix, s->mq_maxmsg);
686
687 if (s->mq_msgsize > 0)
688 fprintf(f,
689 "%sMessageQueueMessageSize: %li\n",
690 prefix, s->mq_msgsize);
691
692 if (s->reuse_port)
693 fprintf(f,
694 "%sReusePort: %s\n",
695 prefix, yes_no(s->reuse_port));
696
697 if (s->smack)
698 fprintf(f,
699 "%sSmackLabel: %s\n",
700 prefix, s->smack);
701
702 if (s->smack_ip_in)
703 fprintf(f,
704 "%sSmackLabelIPIn: %s\n",
705 prefix, s->smack_ip_in);
706
707 if (s->smack_ip_out)
708 fprintf(f,
709 "%sSmackLabelIPOut: %s\n",
710 prefix, s->smack_ip_out);
711
712 if (!isempty(s->user) || !isempty(s->group))
713 fprintf(f,
714 "%sSocketUser: %s\n"
715 "%sSocketGroup: %s\n",
716 prefix, strna(s->user),
717 prefix, strna(s->group));
718
719 if (timestamp_is_set(s->keep_alive_time))
720 fprintf(f,
721 "%sKeepAliveTimeSec: %s\n",
722 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
723
724 if (s->keep_alive_interval > 0)
725 fprintf(f,
726 "%sKeepAliveIntervalSec: %s\n",
727 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
728
729 if (s->keep_alive_cnt > 0)
730 fprintf(f,
731 "%sKeepAliveProbes: %u\n",
732 prefix, s->keep_alive_cnt);
733
734 if (s->defer_accept > 0)
735 fprintf(f,
736 "%sDeferAcceptSec: %s\n",
737 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
738
739 LIST_FOREACH(port, p, s->ports) {
740
741 switch (p->type) {
742 case SOCKET_SOCKET: {
743 _cleanup_free_ char *k = NULL;
744 int r;
745
746 r = socket_address_print(&p->address, &k);
747 if (r < 0) {
748 errno = -r;
749 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
750 } else
751 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
752 break;
753 }
754 case SOCKET_SPECIAL:
755 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
756 break;
757 case SOCKET_USB_FUNCTION:
758 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
759 break;
760 case SOCKET_MQUEUE:
761 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
762 break;
763 default:
764 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
765 }
766 }
767
768 fprintf(f,
769 "%sTriggerLimitIntervalSec: %s\n"
770 "%sTriggerLimitBurst: %u\n",
771 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
772 prefix, s->trigger_limit.burst);
773
774 str = ip_protocol_to_name(s->socket_protocol);
775 if (str)
776 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
777
778 if (!strv_isempty(s->symlinks)) {
779 fprintf(f, "%sSymlinks:", prefix);
780 STRV_FOREACH(q, s->symlinks)
781 fprintf(f, " %s", *q);
782
783 fprintf(f, "\n");
784 }
785
786 fprintf(f,
787 "%sTimeoutSec: %s\n",
788 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
789
790 exec_context_dump(&s->exec_context, f, prefix);
791 kill_context_dump(&s->kill_context, f, prefix);
792
793 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
794 if (!s->exec_command[c])
795 continue;
796
797 fprintf(f, "%s-> %s:\n",
798 prefix, socket_exec_command_to_string(c));
799
800 exec_command_dump_list(s->exec_command[c], f, prefix2);
801 }
802
803 cgroup_context_dump(UNIT(s), f, prefix);
804 }
805
806 static int instance_from_socket(int fd, unsigned nr, char **instance) {
807 socklen_t l;
808 char *r;
809 union sockaddr_union local, remote;
810
811 assert(fd >= 0);
812 assert(instance);
813
814 l = sizeof(local);
815 if (getsockname(fd, &local.sa, &l) < 0)
816 return -errno;
817
818 l = sizeof(remote);
819 if (getpeername(fd, &remote.sa, &l) < 0)
820 return -errno;
821
822 switch (local.sa.sa_family) {
823
824 case AF_INET: {
825 uint32_t
826 a = be32toh(local.in.sin_addr.s_addr),
827 b = be32toh(remote.in.sin_addr.s_addr);
828
829 if (asprintf(&r,
830 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
831 nr,
832 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
833 be16toh(local.in.sin_port),
834 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
835 be16toh(remote.in.sin_port)) < 0)
836 return -ENOMEM;
837
838 break;
839 }
840
841 case AF_INET6: {
842 static const unsigned char ipv4_prefix[] = {
843 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
844 };
845
846 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
847 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
848 const uint8_t
849 *a = local.in6.sin6_addr.s6_addr+12,
850 *b = remote.in6.sin6_addr.s6_addr+12;
851
852 if (asprintf(&r,
853 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
854 nr,
855 a[0], a[1], a[2], a[3],
856 be16toh(local.in6.sin6_port),
857 b[0], b[1], b[2], b[3],
858 be16toh(remote.in6.sin6_port)) < 0)
859 return -ENOMEM;
860 } else {
861 if (asprintf(&r,
862 "%u-%s:%u-%s:%u",
863 nr,
864 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
865 be16toh(local.in6.sin6_port),
866 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
867 be16toh(remote.in6.sin6_port)) < 0)
868 return -ENOMEM;
869 }
870
871 break;
872 }
873
874 case AF_UNIX: {
875 struct ucred ucred;
876 int k;
877
878 k = getpeercred(fd, &ucred);
879 if (k >= 0) {
880 if (asprintf(&r,
881 "%u-"PID_FMT"-"UID_FMT,
882 nr, ucred.pid, ucred.uid) < 0)
883 return -ENOMEM;
884 } else if (k == -ENODATA) {
885 /* This handles the case where somebody is
886 * connecting from another pid/uid namespace
887 * (e.g. from outside of our container). */
888 if (asprintf(&r,
889 "%u-unknown",
890 nr) < 0)
891 return -ENOMEM;
892 } else
893 return k;
894
895 break;
896 }
897
898 case AF_VSOCK:
899 if (asprintf(&r,
900 "%u-%u:%u-%u:%u",
901 nr,
902 local.vm.svm_cid, local.vm.svm_port,
903 remote.vm.svm_cid, remote.vm.svm_port) < 0)
904 return -ENOMEM;
905
906 break;
907
908 default:
909 assert_not_reached();
910 }
911
912 *instance = r;
913 return 0;
914 }
915
916 static void socket_close_fds(Socket *s) {
917 assert(s);
918
919 LIST_FOREACH(port, p, s->ports) {
920 bool was_open;
921
922 was_open = p->fd >= 0;
923
924 p->event_source = sd_event_source_disable_unref(p->event_source);
925 p->fd = safe_close(p->fd);
926 socket_cleanup_fd_list(p);
927
928 /* One little note: we should normally not delete any sockets in the file system here! After all some
929 * other process we spawned might still have a reference of this fd and wants to continue to use
930 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
931 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
932 * anyway, but only then. */
933
934 if (!was_open || !s->remove_on_stop)
935 continue;
936
937 switch (p->type) {
938
939 case SOCKET_FIFO:
940 (void) unlink(p->path);
941 break;
942
943 case SOCKET_MQUEUE:
944 (void) mq_unlink(p->path);
945 break;
946
947 case SOCKET_SOCKET:
948 (void) socket_address_unlink(&p->address);
949 break;
950
951 default:
952 break;
953 }
954 }
955
956 if (s->remove_on_stop)
957 STRV_FOREACH(i, s->symlinks)
958 (void) unlink(*i);
959
960 /* Note that we don't return NULL here, since s has not been freed. */
961 }
962
963 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
964 int r;
965
966 assert(s);
967 assert(p);
968 assert(fd >= 0);
969
970 if (s->keep_alive) {
971 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
972 if (r < 0)
973 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
974 }
975
976 if (timestamp_is_set(s->keep_alive_time)) {
977 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
978 if (r < 0)
979 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
980 }
981
982 if (s->keep_alive_interval > 0) {
983 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
984 if (r < 0)
985 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
986 }
987
988 if (s->keep_alive_cnt > 0) {
989 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
990 if (r < 0)
991 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
992 }
993
994 if (s->defer_accept > 0) {
995 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
996 if (r < 0)
997 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
998 }
999
1000 if (s->no_delay) {
1001 if (s->socket_protocol == IPPROTO_SCTP) {
1002 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1003 if (r < 0)
1004 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1005 } else {
1006 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1007 if (r < 0)
1008 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1009 }
1010 }
1011
1012 if (s->broadcast) {
1013 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1014 if (r < 0)
1015 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1016 }
1017
1018 if (s->pass_cred) {
1019 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1020 if (r < 0)
1021 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1022 }
1023
1024 if (s->pass_sec) {
1025 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1026 if (r < 0)
1027 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1028 }
1029
1030 if (s->pass_pktinfo) {
1031 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1032 if (r < 0)
1033 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1034 }
1035
1036 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1037 r = setsockopt_int(fd, SOL_SOCKET,
1038 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1039 true);
1040 if (r < 0)
1041 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1042 }
1043
1044 if (s->priority >= 0) {
1045 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1046 if (r < 0)
1047 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1048 }
1049
1050 if (s->receive_buffer > 0) {
1051 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1052 if (r < 0)
1053 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1054 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1055 }
1056
1057 if (s->send_buffer > 0) {
1058 r = fd_set_sndbuf(fd, s->send_buffer, false);
1059 if (r < 0)
1060 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1061 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1062 }
1063
1064 if (s->mark >= 0) {
1065 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1066 if (r < 0)
1067 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1068 }
1069
1070 if (s->ip_tos >= 0) {
1071 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1072 if (r < 0)
1073 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1074 }
1075
1076 if (s->ip_ttl >= 0) {
1077 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1078 if (r < 0)
1079 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1080 }
1081
1082 if (s->tcp_congestion)
1083 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1084 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1085
1086 if (s->smack_ip_in) {
1087 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1088 if (r < 0)
1089 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1090 }
1091
1092 if (s->smack_ip_out) {
1093 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1094 if (r < 0)
1095 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1096 }
1097 }
1098
1099 static void socket_apply_fifo_options(Socket *s, int fd) {
1100 int r;
1101
1102 assert(s);
1103 assert(fd >= 0);
1104
1105 if (s->pipe_size > 0)
1106 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1107 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1108
1109 if (s->smack) {
1110 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1111 if (r < 0)
1112 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1113 }
1114 }
1115
1116 static int fifo_address_create(
1117 const char *path,
1118 mode_t directory_mode,
1119 mode_t socket_mode) {
1120
1121 _cleanup_close_ int fd = -EBADF;
1122 mode_t old_mask;
1123 struct stat st;
1124 int r;
1125
1126 assert(path);
1127
1128 (void) mkdir_parents_label(path, directory_mode);
1129
1130 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1131 if (r < 0)
1132 return r;
1133
1134 /* Enforce the right access mode for the fifo */
1135 old_mask = umask(~socket_mode);
1136
1137 /* Include the original umask in our mask */
1138 (void) umask(~socket_mode | old_mask);
1139
1140 r = mkfifo(path, socket_mode);
1141 (void) umask(old_mask);
1142
1143 if (r < 0 && errno != EEXIST) {
1144 r = -errno;
1145 goto fail;
1146 }
1147
1148 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1149 if (fd < 0) {
1150 r = -errno;
1151 goto fail;
1152 }
1153
1154 mac_selinux_create_file_clear();
1155
1156 if (fstat(fd, &st) < 0) {
1157 r = -errno;
1158 goto fail;
1159 }
1160
1161 if (!S_ISFIFO(st.st_mode) ||
1162 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1163 st.st_uid != getuid() ||
1164 st.st_gid != getgid()) {
1165 r = -EEXIST;
1166 goto fail;
1167 }
1168
1169 return TAKE_FD(fd);
1170
1171 fail:
1172 mac_selinux_create_file_clear();
1173 return r;
1174 }
1175
1176 static int special_address_create(const char *path, bool writable) {
1177 _cleanup_close_ int fd = -EBADF;
1178 struct stat st;
1179
1180 assert(path);
1181
1182 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1183 if (fd < 0)
1184 return -errno;
1185
1186 if (fstat(fd, &st) < 0)
1187 return -errno;
1188
1189 /* Check whether this is a /proc, /sys or /dev file or char device */
1190 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1191 return -EEXIST;
1192
1193 return TAKE_FD(fd);
1194 }
1195
1196 static int usbffs_address_create(const char *path) {
1197 _cleanup_close_ int fd = -EBADF;
1198 struct stat st;
1199
1200 assert(path);
1201
1202 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1203 if (fd < 0)
1204 return -errno;
1205
1206 if (fstat(fd, &st) < 0)
1207 return -errno;
1208
1209 /* Check whether this is a regular file (ffs endpoint) */
1210 if (!S_ISREG(st.st_mode))
1211 return -EEXIST;
1212
1213 return TAKE_FD(fd);
1214 }
1215
1216 static int mq_address_create(
1217 const char *path,
1218 mode_t mq_mode,
1219 long maxmsg,
1220 long msgsize) {
1221
1222 _cleanup_close_ int fd = -EBADF;
1223 struct stat st;
1224 mode_t old_mask;
1225 struct mq_attr _attr, *attr = NULL;
1226
1227 assert(path);
1228
1229 if (maxmsg > 0 && msgsize > 0) {
1230 _attr = (struct mq_attr) {
1231 .mq_flags = O_NONBLOCK,
1232 .mq_maxmsg = maxmsg,
1233 .mq_msgsize = msgsize,
1234 };
1235 attr = &_attr;
1236 }
1237
1238 /* Enforce the right access mode for the mq */
1239 old_mask = umask(~mq_mode);
1240
1241 /* Include the original umask in our mask */
1242 (void) umask(~mq_mode | old_mask);
1243 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1244 (void) umask(old_mask);
1245
1246 if (fd < 0)
1247 return -errno;
1248
1249 if (fstat(fd, &st) < 0)
1250 return -errno;
1251
1252 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1253 st.st_uid != getuid() ||
1254 st.st_gid != getgid())
1255 return -EEXIST;
1256
1257 return TAKE_FD(fd);
1258 }
1259
1260 static int socket_symlink(Socket *s) {
1261 const char *p;
1262 int r;
1263
1264 assert(s);
1265
1266 p = socket_find_symlink_target(s);
1267 if (!p)
1268 return 0;
1269
1270 STRV_FOREACH(i, s->symlinks) {
1271 (void) mkdir_parents_label(*i, s->directory_mode);
1272
1273 r = symlink_idempotent(p, *i, false);
1274
1275 if (r == -EEXIST && s->remove_on_stop) {
1276 /* If there's already something where we want to create the symlink, and the destructive
1277 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1278 * again. */
1279
1280 if (unlink(*i) >= 0)
1281 r = symlink_idempotent(p, *i, false);
1282 }
1283
1284 if (r < 0)
1285 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1286 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1287 }
1288
1289 return 0;
1290 }
1291
1292 static int usbffs_write_descs(int fd, Service *s) {
1293 int r;
1294
1295 if (!s->usb_function_descriptors || !s->usb_function_strings)
1296 return -EINVAL;
1297
1298 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1299 if (r < 0)
1300 return r;
1301
1302 return copy_file_fd(s->usb_function_strings, fd, 0);
1303 }
1304
1305 static int usbffs_select_ep(const struct dirent *d) {
1306 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1307 }
1308
1309 static int usbffs_dispatch_eps(SocketPort *p) {
1310 _cleanup_free_ struct dirent **ent = NULL;
1311 size_t n, k;
1312 int r;
1313
1314 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1315 if (r < 0)
1316 return -errno;
1317
1318 n = (size_t) r;
1319 p->auxiliary_fds = new(int, n);
1320 if (!p->auxiliary_fds) {
1321 r = -ENOMEM;
1322 goto clear;
1323 }
1324
1325 p->n_auxiliary_fds = n;
1326
1327 k = 0;
1328 for (size_t i = 0; i < n; ++i) {
1329 _cleanup_free_ char *ep = NULL;
1330
1331 ep = path_make_absolute(ent[i]->d_name, p->path);
1332 if (!ep) {
1333 r = -ENOMEM;
1334 goto fail;
1335 }
1336
1337 path_simplify(ep);
1338
1339 r = usbffs_address_create(ep);
1340 if (r < 0)
1341 goto fail;
1342
1343 p->auxiliary_fds[k++] = r;
1344 }
1345
1346 r = 0;
1347 goto clear;
1348
1349 fail:
1350 close_many(p->auxiliary_fds, k);
1351 p->auxiliary_fds = mfree(p->auxiliary_fds);
1352 p->n_auxiliary_fds = 0;
1353
1354 clear:
1355 for (size_t i = 0; i < n; ++i)
1356 free(ent[i]);
1357
1358 return r;
1359 }
1360
1361 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1362 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1363 *
1364 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1365 * instance name.
1366 */
1367
1368 if (UNIT_ISSET(s->service)) {
1369 *ret = UNIT_DEREF(s->service);
1370 return 0;
1371 }
1372
1373 if (!s->accept)
1374 return -ENODATA;
1375
1376 /* Build the instance name and load the unit */
1377 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1378 int r;
1379
1380 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1381 if (r < 0)
1382 return r;
1383
1384 if (cfd >= 0) {
1385 r = instance_from_socket(cfd, s->n_accepted, &instance);
1386 if (ERRNO_IS_DISCONNECT(r))
1387 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1388 * different errors. This connection is over, but the socket unit lives on. */
1389 return log_unit_debug_errno(UNIT(s), r,
1390 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1391 errno_to_name(r));
1392 if (r < 0)
1393 return r;
1394 }
1395
1396 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1397 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1398 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1399 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1400 if (r < 0)
1401 return r;
1402
1403 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1404 }
1405
1406 static int socket_determine_selinux_label(Socket *s, char **ret) {
1407 int r;
1408
1409 assert(s);
1410 assert(ret);
1411
1412 Unit *service;
1413 ExecCommand *c;
1414 const char *exec_context;
1415 _cleanup_free_ char *path = NULL;
1416
1417 r = socket_load_service_unit(s, -1, &service);
1418 if (r == -ENODATA)
1419 goto no_label;
1420 if (r < 0)
1421 return r;
1422
1423 exec_context = SERVICE(service)->exec_context.selinux_context;
1424 if (exec_context) {
1425 char *con;
1426
1427 con = strdup(exec_context);
1428 if (!con)
1429 return -ENOMEM;
1430
1431 *ret = TAKE_PTR(con);
1432 return 0;
1433 }
1434
1435 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1436 if (!c)
1437 goto no_label;
1438
1439 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1440 if (r < 0)
1441 goto no_label;
1442
1443 r = mac_selinux_get_create_label_from_exe(path, ret);
1444 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1445 goto no_label;
1446 return r;
1447
1448 no_label:
1449 *ret = NULL;
1450 return 0;
1451 }
1452
1453 static int socket_address_listen_do(
1454 Socket *s,
1455 const SocketAddress *address,
1456 const char *label) {
1457
1458 assert(s);
1459 assert(address);
1460
1461 return socket_address_listen(
1462 address,
1463 SOCK_CLOEXEC|SOCK_NONBLOCK,
1464 s->backlog,
1465 s->bind_ipv6_only,
1466 s->bind_to_device,
1467 s->reuse_port,
1468 s->free_bind,
1469 s->transparent,
1470 s->directory_mode,
1471 s->socket_mode,
1472 label);
1473 }
1474
1475 #define log_address_error_errno(u, address, error, fmt) \
1476 ({ \
1477 _cleanup_free_ char *_t = NULL; \
1478 \
1479 (void) socket_address_print(address, &_t); \
1480 log_unit_error_errno(u, error, fmt, strna(_t)); \
1481 })
1482
1483 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1484 int r;
1485
1486 assert(address);
1487 assert(context);
1488
1489 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1490
1491 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1492 r = bpf_firewall_supported();
1493 if (r < 0)
1494 return r;
1495 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1496 return true;
1497 }
1498
1499 return exec_needs_network_namespace(context);
1500 }
1501
1502 static int socket_address_listen_in_cgroup(
1503 Socket *s,
1504 const SocketAddress *address,
1505 const char *label) {
1506
1507 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1508 int fd, r;
1509 pid_t pid;
1510
1511 assert(s);
1512 assert(address);
1513
1514 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1515 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1516 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1517 * such. */
1518
1519 r = fork_needed(address, &s->exec_context);
1520 if (r < 0)
1521 return r;
1522 if (r == 0) {
1523 /* Shortcut things... */
1524 fd = socket_address_listen_do(s, address, label);
1525 if (fd < 0)
1526 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1527
1528 return fd;
1529 }
1530
1531 r = unit_setup_exec_runtime(UNIT(s));
1532 if (r < 0)
1533 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1534
1535 if (s->exec_context.network_namespace_path &&
1536 s->exec_runtime &&
1537 s->exec_runtime->shared &&
1538 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1539 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1540 if (r < 0)
1541 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1542 }
1543
1544 if (s->exec_context.ipc_namespace_path &&
1545 s->exec_runtime &&
1546 s->exec_runtime->shared &&
1547 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1548 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1549 if (r < 0)
1550 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1551 }
1552
1553 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1554 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1555
1556 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1557 if (r < 0)
1558 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1559 if (r == 0) {
1560 /* Child */
1561
1562 pair[0] = safe_close(pair[0]);
1563
1564 if (exec_needs_network_namespace(&s->exec_context) &&
1565 s->exec_runtime &&
1566 s->exec_runtime->shared &&
1567 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1568
1569 if (ns_type_supported(NAMESPACE_NET)) {
1570 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1571 if (r < 0) {
1572 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1573 _exit(EXIT_NETWORK);
1574 }
1575 } else if (s->exec_context.network_namespace_path) {
1576 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1577 _exit(EXIT_NETWORK);
1578 } else
1579 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1580 }
1581
1582 fd = socket_address_listen_do(s, address, label);
1583 if (fd < 0) {
1584 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1585 _exit(EXIT_FAILURE);
1586 }
1587
1588 r = send_one_fd(pair[1], fd, 0);
1589 if (r < 0) {
1590 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1591 _exit(EXIT_FAILURE);
1592 }
1593
1594 _exit(EXIT_SUCCESS);
1595 }
1596
1597 pair[1] = safe_close(pair[1]);
1598 fd = receive_one_fd(pair[0], 0);
1599
1600 /* We synchronously wait for the helper, as it shouldn't be slow */
1601 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1602 if (r < 0) {
1603 safe_close(fd);
1604 return r;
1605 }
1606
1607 if (fd < 0)
1608 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1609
1610 return fd;
1611 }
1612
1613 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1614
1615 static int socket_open_fds(Socket *orig_s) {
1616 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1617 _cleanup_(mac_selinux_freep) char *label = NULL;
1618 bool know_label = false;
1619 int r;
1620
1621 assert(s);
1622
1623 LIST_FOREACH(port, p, s->ports) {
1624
1625 if (p->fd >= 0)
1626 continue;
1627
1628 switch (p->type) {
1629
1630 case SOCKET_SOCKET:
1631
1632 if (!know_label) {
1633 /* Figure out the label, if we don't it know yet. We do it once for the first
1634 * socket where we need this and remember it for the rest. */
1635
1636 r = socket_determine_selinux_label(s, &label);
1637 if (r < 0)
1638 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1639
1640 know_label = true;
1641 }
1642
1643 /* Apply the socket protocol */
1644 switch (p->address.type) {
1645
1646 case SOCK_STREAM:
1647 case SOCK_SEQPACKET:
1648 if (s->socket_protocol == IPPROTO_SCTP)
1649 p->address.protocol = s->socket_protocol;
1650 break;
1651
1652 case SOCK_DGRAM:
1653 if (s->socket_protocol == IPPROTO_UDPLITE)
1654 p->address.protocol = s->socket_protocol;
1655 break;
1656 }
1657
1658 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1659 if (p->fd < 0)
1660 return p->fd;
1661
1662 socket_apply_socket_options(s, p, p->fd);
1663 socket_symlink(s);
1664 break;
1665
1666 case SOCKET_SPECIAL:
1667
1668 p->fd = special_address_create(p->path, s->writable);
1669 if (p->fd < 0)
1670 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1671 break;
1672
1673 case SOCKET_FIFO:
1674
1675 p->fd = fifo_address_create(
1676 p->path,
1677 s->directory_mode,
1678 s->socket_mode);
1679 if (p->fd < 0)
1680 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1681
1682 socket_apply_fifo_options(s, p->fd);
1683 socket_symlink(s);
1684 break;
1685
1686 case SOCKET_MQUEUE:
1687
1688 p->fd = mq_address_create(
1689 p->path,
1690 s->socket_mode,
1691 s->mq_maxmsg,
1692 s->mq_msgsize);
1693 if (p->fd < 0)
1694 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1695 break;
1696
1697 case SOCKET_USB_FUNCTION: {
1698 _cleanup_free_ char *ep = NULL;
1699
1700 ep = path_make_absolute("ep0", p->path);
1701 if (!ep)
1702 return -ENOMEM;
1703
1704 p->fd = usbffs_address_create(ep);
1705 if (p->fd < 0)
1706 return p->fd;
1707
1708 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1709 if (r < 0)
1710 return r;
1711
1712 r = usbffs_dispatch_eps(p);
1713 if (r < 0)
1714 return r;
1715
1716 break;
1717 }
1718 default:
1719 assert_not_reached();
1720 }
1721 }
1722
1723 s = NULL;
1724 return 0;
1725 }
1726
1727 static void socket_unwatch_fds(Socket *s) {
1728 int r;
1729
1730 assert(s);
1731
1732 LIST_FOREACH(port, p, s->ports) {
1733 if (p->fd < 0)
1734 continue;
1735
1736 if (!p->event_source)
1737 continue;
1738
1739 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1740 if (r < 0)
1741 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1742 }
1743 }
1744
1745 static int socket_watch_fds(Socket *s) {
1746 int r;
1747
1748 assert(s);
1749
1750 LIST_FOREACH(port, p, s->ports) {
1751 if (p->fd < 0)
1752 continue;
1753
1754 if (p->event_source) {
1755 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1756 if (r < 0)
1757 goto fail;
1758 } else {
1759 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1760 if (r < 0)
1761 goto fail;
1762
1763 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1764 }
1765 }
1766
1767 return 0;
1768
1769 fail:
1770 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1771 socket_unwatch_fds(s);
1772 return r;
1773 }
1774
1775 enum {
1776 SOCKET_OPEN_NONE,
1777 SOCKET_OPEN_SOME,
1778 SOCKET_OPEN_ALL,
1779 };
1780
1781 static int socket_check_open(Socket *s) {
1782 bool have_open = false, have_closed = false;
1783
1784 assert(s);
1785
1786 LIST_FOREACH(port, p, s->ports) {
1787 if (p->fd < 0)
1788 have_closed = true;
1789 else
1790 have_open = true;
1791
1792 if (have_open && have_closed)
1793 return SOCKET_OPEN_SOME;
1794 }
1795
1796 if (have_open)
1797 return SOCKET_OPEN_ALL;
1798
1799 return SOCKET_OPEN_NONE;
1800 }
1801
1802 static void socket_set_state(Socket *s, SocketState state) {
1803 SocketState old_state;
1804 assert(s);
1805
1806 if (s->state != state)
1807 bus_unit_send_pending_change_signal(UNIT(s), false);
1808
1809 old_state = s->state;
1810 s->state = state;
1811
1812 if (!IN_SET(state,
1813 SOCKET_START_PRE,
1814 SOCKET_START_CHOWN,
1815 SOCKET_START_POST,
1816 SOCKET_STOP_PRE,
1817 SOCKET_STOP_PRE_SIGTERM,
1818 SOCKET_STOP_PRE_SIGKILL,
1819 SOCKET_STOP_POST,
1820 SOCKET_FINAL_SIGTERM,
1821 SOCKET_FINAL_SIGKILL,
1822 SOCKET_CLEANING)) {
1823
1824 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1825 socket_unwatch_control_pid(s);
1826 s->control_command = NULL;
1827 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1828 }
1829
1830 if (state != SOCKET_LISTENING)
1831 socket_unwatch_fds(s);
1832
1833 if (!IN_SET(state,
1834 SOCKET_START_CHOWN,
1835 SOCKET_START_POST,
1836 SOCKET_LISTENING,
1837 SOCKET_RUNNING,
1838 SOCKET_STOP_PRE,
1839 SOCKET_STOP_PRE_SIGTERM,
1840 SOCKET_STOP_PRE_SIGKILL,
1841 SOCKET_CLEANING))
1842 socket_close_fds(s);
1843
1844 if (state != old_state)
1845 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1846
1847 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1848 }
1849
1850 static int socket_coldplug(Unit *u) {
1851 Socket *s = SOCKET(u);
1852 int r;
1853
1854 assert(s);
1855 assert(s->state == SOCKET_DEAD);
1856
1857 if (s->deserialized_state == s->state)
1858 return 0;
1859
1860 if (s->control_pid > 0 &&
1861 pid_is_unwaited(s->control_pid) &&
1862 IN_SET(s->deserialized_state,
1863 SOCKET_START_PRE,
1864 SOCKET_START_CHOWN,
1865 SOCKET_START_POST,
1866 SOCKET_STOP_PRE,
1867 SOCKET_STOP_PRE_SIGTERM,
1868 SOCKET_STOP_PRE_SIGKILL,
1869 SOCKET_STOP_POST,
1870 SOCKET_FINAL_SIGTERM,
1871 SOCKET_FINAL_SIGKILL,
1872 SOCKET_CLEANING)) {
1873
1874 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1875 if (r < 0)
1876 return r;
1877
1878 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1879 if (r < 0)
1880 return r;
1881 }
1882
1883 if (IN_SET(s->deserialized_state,
1884 SOCKET_START_CHOWN,
1885 SOCKET_START_POST,
1886 SOCKET_LISTENING,
1887 SOCKET_RUNNING)) {
1888
1889 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1890 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1891 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1892 * and if there's a mismatch, warn loudly. */
1893
1894 r = socket_check_open(s);
1895 if (r == SOCKET_OPEN_NONE)
1896 log_unit_warning(UNIT(s),
1897 "Socket unit configuration has changed while unit has been running, "
1898 "no open socket file descriptor left. "
1899 "The socket unit is not functional until restarted.");
1900 else if (r == SOCKET_OPEN_SOME)
1901 log_unit_warning(UNIT(s),
1902 "Socket unit configuration has changed while unit has been running, "
1903 "and some socket file descriptors have not been opened yet. "
1904 "The socket unit is not fully functional until restarted.");
1905 }
1906
1907 if (s->deserialized_state == SOCKET_LISTENING) {
1908 r = socket_watch_fds(s);
1909 if (r < 0)
1910 return r;
1911 }
1912
1913 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1914 (void) unit_setup_exec_runtime(u);
1915
1916 socket_set_state(s, s->deserialized_state);
1917 return 0;
1918 }
1919
1920 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1921
1922 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1923 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1924 .stdin_fd = -EBADF,
1925 .stdout_fd = -EBADF,
1926 .stderr_fd = -EBADF,
1927 .exec_fd = -EBADF,
1928 };
1929 pid_t pid;
1930 int r;
1931
1932 assert(s);
1933 assert(c);
1934 assert(_pid);
1935
1936 r = unit_prepare_exec(UNIT(s));
1937 if (r < 0)
1938 return r;
1939
1940 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1941 if (r < 0)
1942 return r;
1943
1944 r = unit_set_exec_params(UNIT(s), &exec_params);
1945 if (r < 0)
1946 return r;
1947
1948 r = exec_spawn(UNIT(s),
1949 c,
1950 &s->exec_context,
1951 &exec_params,
1952 s->exec_runtime,
1953 &s->cgroup_context,
1954 &pid);
1955 if (r < 0)
1956 return r;
1957
1958 r = unit_watch_pid(UNIT(s), pid, true);
1959 if (r < 0)
1960 return r;
1961
1962 *_pid = pid;
1963
1964 return 0;
1965 }
1966
1967 static int socket_chown(Socket *s, pid_t *_pid) {
1968 pid_t pid;
1969 int r;
1970
1971 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1972 if (r < 0)
1973 goto fail;
1974
1975 /* We have to resolve the user names out-of-process, hence
1976 * let's fork here. It's messy, but well, what can we do? */
1977
1978 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1979 if (r < 0)
1980 return r;
1981 if (r == 0) {
1982 uid_t uid = UID_INVALID;
1983 gid_t gid = GID_INVALID;
1984
1985 /* Child */
1986
1987 if (!isempty(s->user)) {
1988 const char *user = s->user;
1989
1990 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1991 if (r < 0) {
1992 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1993 _exit(EXIT_USER);
1994 }
1995 }
1996
1997 if (!isempty(s->group)) {
1998 const char *group = s->group;
1999
2000 r = get_group_creds(&group, &gid, 0);
2001 if (r < 0) {
2002 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2003 _exit(EXIT_GROUP);
2004 }
2005 }
2006
2007 LIST_FOREACH(port, p, s->ports) {
2008 const char *path = NULL;
2009
2010 if (p->type == SOCKET_SOCKET)
2011 path = socket_address_get_path(&p->address);
2012 else if (p->type == SOCKET_FIFO)
2013 path = p->path;
2014
2015 if (!path)
2016 continue;
2017
2018 if (chown(path, uid, gid) < 0) {
2019 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2020 _exit(EXIT_CHOWN);
2021 }
2022 }
2023
2024 _exit(EXIT_SUCCESS);
2025 }
2026
2027 r = unit_watch_pid(UNIT(s), pid, true);
2028 if (r < 0)
2029 goto fail;
2030
2031 *_pid = pid;
2032 return 0;
2033
2034 fail:
2035 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2036 return r;
2037 }
2038
2039 static void socket_enter_dead(Socket *s, SocketResult f) {
2040 assert(s);
2041
2042 if (s->result == SOCKET_SUCCESS)
2043 s->result = f;
2044
2045 if (s->result == SOCKET_SUCCESS)
2046 unit_log_success(UNIT(s));
2047 else
2048 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2049
2050 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2051
2052 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2053
2054 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2055
2056 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2057
2058 unit_unref_uid_gid(UNIT(s), true);
2059 }
2060
2061 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2062
2063 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2064 int r;
2065 assert(s);
2066
2067 if (s->result == SOCKET_SUCCESS)
2068 s->result = f;
2069
2070 socket_unwatch_control_pid(s);
2071 s->control_command_id = SOCKET_EXEC_STOP_POST;
2072 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2073
2074 if (s->control_command) {
2075 r = socket_spawn(s, s->control_command, &s->control_pid);
2076 if (r < 0)
2077 goto fail;
2078
2079 socket_set_state(s, SOCKET_STOP_POST);
2080 } else
2081 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2082
2083 return;
2084
2085 fail:
2086 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2087 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2088 }
2089
2090 static int state_to_kill_operation(Socket *s, SocketState state) {
2091 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2092 return KILL_RESTART;
2093
2094 if (state == SOCKET_FINAL_SIGTERM)
2095 return KILL_TERMINATE;
2096
2097 return KILL_KILL;
2098 }
2099
2100 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2101 int r;
2102
2103 assert(s);
2104
2105 if (s->result == SOCKET_SUCCESS)
2106 s->result = f;
2107
2108 r = unit_kill_context(
2109 UNIT(s),
2110 &s->kill_context,
2111 state_to_kill_operation(s, state),
2112 -1,
2113 s->control_pid,
2114 false);
2115 if (r < 0)
2116 goto fail;
2117
2118 if (r > 0) {
2119 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2120 if (r < 0)
2121 goto fail;
2122
2123 socket_set_state(s, state);
2124 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2125 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2126 else if (state == SOCKET_STOP_PRE_SIGKILL)
2127 socket_enter_stop_post(s, SOCKET_SUCCESS);
2128 else if (state == SOCKET_FINAL_SIGTERM)
2129 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2130 else
2131 socket_enter_dead(s, SOCKET_SUCCESS);
2132
2133 return;
2134
2135 fail:
2136 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2137
2138 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2139 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2140 else
2141 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2142 }
2143
2144 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2145 int r;
2146 assert(s);
2147
2148 if (s->result == SOCKET_SUCCESS)
2149 s->result = f;
2150
2151 socket_unwatch_control_pid(s);
2152 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2153 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2154
2155 if (s->control_command) {
2156 r = socket_spawn(s, s->control_command, &s->control_pid);
2157 if (r < 0)
2158 goto fail;
2159
2160 socket_set_state(s, SOCKET_STOP_PRE);
2161 } else
2162 socket_enter_stop_post(s, SOCKET_SUCCESS);
2163
2164 return;
2165
2166 fail:
2167 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2168 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2169 }
2170
2171 static void socket_enter_listening(Socket *s) {
2172 int r;
2173 assert(s);
2174
2175 if (!s->accept && s->flush_pending) {
2176 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2177 flush_ports(s);
2178 }
2179
2180 r = socket_watch_fds(s);
2181 if (r < 0) {
2182 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2183 goto fail;
2184 }
2185
2186 socket_set_state(s, SOCKET_LISTENING);
2187 return;
2188
2189 fail:
2190 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2191 }
2192
2193 static void socket_enter_start_post(Socket *s) {
2194 int r;
2195 assert(s);
2196
2197 socket_unwatch_control_pid(s);
2198 s->control_command_id = SOCKET_EXEC_START_POST;
2199 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2200
2201 if (s->control_command) {
2202 r = socket_spawn(s, s->control_command, &s->control_pid);
2203 if (r < 0) {
2204 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2205 goto fail;
2206 }
2207
2208 socket_set_state(s, SOCKET_START_POST);
2209 } else
2210 socket_enter_listening(s);
2211
2212 return;
2213
2214 fail:
2215 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2216 }
2217
2218 static void socket_enter_start_chown(Socket *s) {
2219 int r;
2220
2221 assert(s);
2222
2223 r = socket_open_fds(s);
2224 if (r < 0) {
2225 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2226 goto fail;
2227 }
2228
2229 if (!isempty(s->user) || !isempty(s->group)) {
2230
2231 socket_unwatch_control_pid(s);
2232 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2233 s->control_command = NULL;
2234
2235 r = socket_chown(s, &s->control_pid);
2236 if (r < 0) {
2237 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2238 goto fail;
2239 }
2240
2241 socket_set_state(s, SOCKET_START_CHOWN);
2242 } else
2243 socket_enter_start_post(s);
2244
2245 return;
2246
2247 fail:
2248 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2249 }
2250
2251 static void socket_enter_start_pre(Socket *s) {
2252 int r;
2253 assert(s);
2254
2255 socket_unwatch_control_pid(s);
2256
2257 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2258
2259 s->control_command_id = SOCKET_EXEC_START_PRE;
2260 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2261
2262 if (s->control_command) {
2263 r = socket_spawn(s, s->control_command, &s->control_pid);
2264 if (r < 0) {
2265 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2266 goto fail;
2267 }
2268
2269 socket_set_state(s, SOCKET_START_PRE);
2270 } else
2271 socket_enter_start_chown(s);
2272
2273 return;
2274
2275 fail:
2276 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2277 }
2278
2279 static void flush_ports(Socket *s) {
2280 assert(s);
2281
2282 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2283 * anymore */
2284
2285 LIST_FOREACH(port, p, s->ports) {
2286 if (p->fd < 0)
2287 continue;
2288
2289 (void) flush_accept(p->fd);
2290 (void) flush_fd(p->fd);
2291 }
2292 }
2293
2294 static void socket_enter_running(Socket *s, int cfd_in) {
2295 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2296 * somewhere or close it. */
2297 _cleanup_close_ int cfd = cfd_in;
2298
2299 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2300 int r;
2301
2302 assert(s);
2303
2304 /* We don't take connections anymore if we are supposed to shut down anyway */
2305 if (unit_stop_pending(UNIT(s))) {
2306
2307 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2308
2309 if (cfd >= 0)
2310 goto refuse;
2311
2312 flush_ports(s);
2313 return;
2314 }
2315
2316 if (!ratelimit_below(&s->trigger_limit)) {
2317 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2318 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2319 goto refuse;
2320 }
2321
2322 if (cfd < 0) {
2323 bool pending = false;
2324 Unit *other;
2325
2326 /* If there's already a start pending don't bother to do anything */
2327 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2328 if (unit_active_or_pending(other)) {
2329 pending = true;
2330 break;
2331 }
2332
2333 if (!pending) {
2334 if (!UNIT_ISSET(s->service)) {
2335 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2336 "Service to activate vanished, refusing activation.");
2337 goto fail;
2338 }
2339
2340 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2341 if (r < 0)
2342 goto fail;
2343 }
2344
2345 socket_set_state(s, SOCKET_RUNNING);
2346 } else {
2347 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2348 Unit *service;
2349
2350 if (s->n_connections >= s->max_connections) {
2351 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2352 s->n_connections);
2353 goto refuse;
2354 }
2355
2356 if (s->max_connections_per_source > 0) {
2357 r = socket_acquire_peer(s, cfd, &p);
2358 if (ERRNO_IS_DISCONNECT(r))
2359 return;
2360 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2361 goto fail;
2362 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2363 _cleanup_free_ char *t = NULL;
2364
2365 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2366
2367 log_unit_warning(UNIT(s),
2368 "Too many incoming connections (%u) from source %s, dropping connection.",
2369 p->n_ref, strnull(t));
2370 goto refuse;
2371 }
2372 }
2373
2374 r = socket_load_service_unit(s, cfd, &service);
2375 if (ERRNO_IS_DISCONNECT(r))
2376 return;
2377 if (r < 0)
2378 goto fail;
2379
2380 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2381 false, UNIT_DEPENDENCY_IMPLICIT);
2382 if (r < 0)
2383 goto fail;
2384
2385 s->n_accepted++;
2386
2387 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2388 if (ERRNO_IS_DISCONNECT(r))
2389 return;
2390 if (r < 0)
2391 goto fail;
2392
2393 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2394 s->n_connections++;
2395
2396 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2397 if (r < 0) {
2398 /* We failed to activate the new service, but it still exists. Let's make sure the
2399 * service closes and forgets the connection fd again, immediately. */
2400 service_release_socket_fd(SERVICE(service));
2401 goto fail;
2402 }
2403
2404 /* Notify clients about changed counters */
2405 unit_add_to_dbus_queue(UNIT(s));
2406 }
2407
2408 TAKE_FD(cfd);
2409 return;
2410
2411 refuse:
2412 s->n_refused++;
2413 return;
2414
2415 fail:
2416 if (ERRNO_IS_RESOURCE(r))
2417 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2418 bus_error_message(&error, r));
2419 else
2420 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2421 cfd >= 0 ? "template" : "non-template",
2422 bus_error_message(&error, r));
2423
2424 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2425 }
2426
2427 static void socket_run_next(Socket *s) {
2428 int r;
2429
2430 assert(s);
2431 assert(s->control_command);
2432 assert(s->control_command->command_next);
2433
2434 socket_unwatch_control_pid(s);
2435
2436 s->control_command = s->control_command->command_next;
2437
2438 r = socket_spawn(s, s->control_command, &s->control_pid);
2439 if (r < 0)
2440 goto fail;
2441
2442 return;
2443
2444 fail:
2445 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2446
2447 if (s->state == SOCKET_START_POST)
2448 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2449 else if (s->state == SOCKET_STOP_POST)
2450 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2451 else
2452 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2453 }
2454
2455 static int socket_start(Unit *u) {
2456 Socket *s = SOCKET(u);
2457 int r;
2458
2459 assert(s);
2460
2461 /* We cannot fulfill this request right now, try again later
2462 * please! */
2463 if (IN_SET(s->state,
2464 SOCKET_STOP_PRE,
2465 SOCKET_STOP_PRE_SIGKILL,
2466 SOCKET_STOP_PRE_SIGTERM,
2467 SOCKET_STOP_POST,
2468 SOCKET_FINAL_SIGTERM,
2469 SOCKET_FINAL_SIGKILL,
2470 SOCKET_CLEANING))
2471 return -EAGAIN;
2472
2473 /* Already on it! */
2474 if (IN_SET(s->state,
2475 SOCKET_START_PRE,
2476 SOCKET_START_CHOWN,
2477 SOCKET_START_POST))
2478 return 0;
2479
2480 /* Cannot run this without the service being around */
2481 if (UNIT_ISSET(s->service)) {
2482 Service *service;
2483
2484 service = SERVICE(UNIT_DEREF(s->service));
2485
2486 if (UNIT(service)->load_state != UNIT_LOADED)
2487 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2488
2489 /* If the service is already active we cannot start the
2490 * socket */
2491 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED_BEFORE_AUTO_RESTART, SERVICE_AUTO_RESTART))
2492 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2493 }
2494
2495 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2496
2497 r = unit_acquire_invocation_id(u);
2498 if (r < 0)
2499 return r;
2500
2501 s->result = SOCKET_SUCCESS;
2502 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2503
2504 u->reset_accounting = true;
2505
2506 socket_enter_start_pre(s);
2507 return 1;
2508 }
2509
2510 static int socket_stop(Unit *u) {
2511 Socket *s = SOCKET(u);
2512
2513 assert(s);
2514
2515 /* Already on it */
2516 if (IN_SET(s->state,
2517 SOCKET_STOP_PRE,
2518 SOCKET_STOP_PRE_SIGTERM,
2519 SOCKET_STOP_PRE_SIGKILL,
2520 SOCKET_STOP_POST,
2521 SOCKET_FINAL_SIGTERM,
2522 SOCKET_FINAL_SIGKILL))
2523 return 0;
2524
2525 /* If there's already something running we go directly into
2526 * kill mode. */
2527 if (IN_SET(s->state,
2528 SOCKET_START_PRE,
2529 SOCKET_START_CHOWN,
2530 SOCKET_START_POST)) {
2531 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2532 return -EAGAIN;
2533 }
2534
2535 /* If we are currently cleaning, then abort it, brutally. */
2536 if (s->state == SOCKET_CLEANING) {
2537 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2538 return 0;
2539 }
2540
2541 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2542
2543 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2544 return 1;
2545 }
2546
2547 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2548 Socket *s = SOCKET(u);
2549 int r;
2550
2551 assert(u);
2552 assert(f);
2553 assert(fds);
2554
2555 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2556 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2557 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2558 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2559
2560 if (s->control_pid > 0)
2561 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2562
2563 if (s->control_command_id >= 0)
2564 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2565
2566 LIST_FOREACH(port, p, s->ports) {
2567 int copy;
2568
2569 if (p->fd < 0)
2570 continue;
2571
2572 copy = fdset_put_dup(fds, p->fd);
2573 if (copy < 0)
2574 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2575
2576 if (p->type == SOCKET_SOCKET) {
2577 _cleanup_free_ char *t = NULL;
2578
2579 r = socket_address_print(&p->address, &t);
2580 if (r < 0)
2581 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2582
2583 if (socket_address_family(&p->address) == AF_NETLINK)
2584 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2585 else
2586 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2587 } else if (p->type == SOCKET_SPECIAL)
2588 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2589 else if (p->type == SOCKET_MQUEUE)
2590 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2591 else if (p->type == SOCKET_USB_FUNCTION)
2592 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2593 else {
2594 assert(p->type == SOCKET_FIFO);
2595 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2596 }
2597 }
2598
2599 return 0;
2600 }
2601
2602 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2603 Socket *s = SOCKET(u);
2604 int r;
2605
2606 assert(u);
2607 assert(key);
2608 assert(value);
2609
2610 if (streq(key, "state")) {
2611 SocketState state;
2612
2613 state = socket_state_from_string(value);
2614 if (state < 0)
2615 log_unit_debug(u, "Failed to parse state value: %s", value);
2616 else
2617 s->deserialized_state = state;
2618 } else if (streq(key, "result")) {
2619 SocketResult f;
2620
2621 f = socket_result_from_string(value);
2622 if (f < 0)
2623 log_unit_debug(u, "Failed to parse result value: %s", value);
2624 else if (f != SOCKET_SUCCESS)
2625 s->result = f;
2626
2627 } else if (streq(key, "n-accepted")) {
2628 unsigned k;
2629
2630 if (safe_atou(value, &k) < 0)
2631 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2632 else
2633 s->n_accepted += k;
2634 } else if (streq(key, "n-refused")) {
2635 unsigned k;
2636
2637 if (safe_atou(value, &k) < 0)
2638 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2639 else
2640 s->n_refused += k;
2641 } else if (streq(key, "control-pid")) {
2642 pid_t pid;
2643
2644 if (parse_pid(value, &pid) < 0)
2645 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2646 else
2647 s->control_pid = pid;
2648 } else if (streq(key, "control-command")) {
2649 SocketExecCommand id;
2650
2651 id = socket_exec_command_from_string(value);
2652 if (id < 0)
2653 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2654 else {
2655 s->control_command_id = id;
2656 s->control_command = s->exec_command[id];
2657 }
2658 } else if (streq(key, "fifo")) {
2659 _cleanup_free_ char *fdv = NULL;
2660 bool found = false;
2661 int fd;
2662
2663 r = extract_first_word(&value, &fdv, NULL, 0);
2664 if (r <= 0) {
2665 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2666 return 0;
2667 }
2668
2669 fd = parse_fd(fdv);
2670 if (fd < 0 || !fdset_contains(fds, fd)) {
2671 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2672 return 0;
2673 }
2674
2675 LIST_FOREACH(port, p, s->ports)
2676 if (p->fd < 0 &&
2677 p->type == SOCKET_FIFO &&
2678 path_equal_or_inode_same(p->path, value, 0)) {
2679 p->fd = fdset_remove(fds, fd);
2680 found = true;
2681 break;
2682 }
2683 if (!found)
2684 log_unit_debug(u, "No matching fifo socket found: %s", value);
2685
2686 } else if (streq(key, "special")) {
2687 _cleanup_free_ char *fdv = NULL;
2688 bool found = false;
2689 int fd;
2690
2691 r = extract_first_word(&value, &fdv, NULL, 0);
2692 if (r <= 0) {
2693 log_unit_debug(u, "Failed to parse special value: %s", value);
2694 return 0;
2695 }
2696
2697 fd = parse_fd(fdv);
2698 if (fd < 0 || !fdset_contains(fds, fd)) {
2699 log_unit_debug(u, "Invalid special value: %s", fdv);
2700 return 0;
2701 }
2702
2703 LIST_FOREACH(port, p, s->ports)
2704 if (p->fd < 0 &&
2705 p->type == SOCKET_SPECIAL &&
2706 path_equal_or_inode_same(p->path, value, 0)) {
2707 p->fd = fdset_remove(fds, fd);
2708 found = true;
2709 break;
2710 }
2711 if (!found)
2712 log_unit_debug(u, "No matching special socket found: %s", value);
2713
2714 } else if (streq(key, "mqueue")) {
2715 _cleanup_free_ char *fdv = NULL;
2716 bool found = false;
2717 int fd;
2718
2719 r = extract_first_word(&value, &fdv, NULL, 0);
2720 if (r <= 0) {
2721 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2722 return 0;
2723 }
2724
2725 fd = parse_fd(fdv);
2726 if (fd < 0 || !fdset_contains(fds, fd)) {
2727 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2728 return 0;
2729 }
2730
2731 LIST_FOREACH(port, p, s->ports)
2732 if (p->fd < 0 &&
2733 p->type == SOCKET_MQUEUE &&
2734 streq(p->path, value)) {
2735 p->fd = fdset_remove(fds, fd);
2736 found = true;
2737 break;
2738 }
2739 if (!found)
2740 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2741
2742 } else if (streq(key, "socket")) {
2743 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2744 bool found = false;
2745 int fd, type;
2746
2747 r = extract_first_word(&value, &fdv, NULL, 0);
2748 if (r <= 0) {
2749 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2750 return 0;
2751 }
2752
2753 fd = parse_fd(fdv);
2754 if (fd < 0 || !fdset_contains(fds, fd)) {
2755 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2756 return 0;
2757 }
2758
2759 r = extract_first_word(&value, &typev, NULL, 0);
2760 if (r <= 0) {
2761 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2762 return 0;
2763 }
2764
2765 if (safe_atoi(typev, &type) < 0 || type < 0) {
2766 log_unit_debug(u, "Invalid socket type: %s", typev);
2767 return 0;
2768 }
2769
2770 LIST_FOREACH(port, p, s->ports)
2771 if (p->fd < 0 &&
2772 socket_address_is(&p->address, value, type)) {
2773 p->fd = fdset_remove(fds, fd);
2774 found = true;
2775 break;
2776 }
2777 if (!found)
2778 log_unit_debug(u, "No matching %s socket found: %s",
2779 socket_address_type_to_string(type), value);
2780
2781 } else if (streq(key, "netlink")) {
2782 _cleanup_free_ char *fdv = NULL;
2783 bool found = false;
2784 int fd;
2785
2786 r = extract_first_word(&value, &fdv, NULL, 0);
2787 if (r <= 0) {
2788 log_unit_debug(u, "Failed to parse socket value: %s", value);
2789 return 0;
2790 }
2791
2792 fd = parse_fd(fdv);
2793 if (fd < 0 || !fdset_contains(fds, fd)) {
2794 log_unit_debug(u, "Invalid socket value: %s", fdv);
2795 return 0;
2796 }
2797
2798 LIST_FOREACH(port, p, s->ports)
2799 if (p->fd < 0 &&
2800 socket_address_is_netlink(&p->address, value)) {
2801 p->fd = fdset_remove(fds, fd);
2802 found = true;
2803 break;
2804 }
2805 if (!found)
2806 log_unit_debug(u, "No matching netlink socket found: %s", value);
2807
2808 } else if (streq(key, "ffs")) {
2809 _cleanup_free_ char *fdv = NULL;
2810 bool found = false;
2811 int fd;
2812
2813 r = extract_first_word(&value, &fdv, NULL, 0);
2814 if (r <= 0) {
2815 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2816 return 0;
2817 }
2818
2819 fd = parse_fd(fdv);
2820 if (fd < 0 || !fdset_contains(fds, fd)) {
2821 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2822 return 0;
2823 }
2824
2825 LIST_FOREACH(port, p, s->ports)
2826 if (p->fd < 0 &&
2827 p->type == SOCKET_USB_FUNCTION &&
2828 path_equal_or_inode_same(p->path, value, 0)) {
2829 p->fd = fdset_remove(fds, fd);
2830 found = true;
2831 break;
2832 }
2833 if (!found)
2834 log_unit_debug(u, "No matching ffs socket found: %s", value);
2835
2836 } else
2837 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2838
2839 return 0;
2840 }
2841
2842 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2843 Socket *s = SOCKET(u);
2844
2845 assert(u);
2846
2847 LIST_FOREACH(port, p, s->ports) {
2848 int fd;
2849
2850 if (p->type != SOCKET_SOCKET)
2851 continue;
2852
2853 if (p->fd >= 0)
2854 continue;
2855
2856 FDSET_FOREACH(fd, fds) {
2857 if (socket_address_matches_fd(&p->address, fd)) {
2858 p->fd = fdset_remove(fds, fd);
2859 s->deserialized_state = SOCKET_LISTENING;
2860 break;
2861 }
2862 }
2863 }
2864 }
2865
2866 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2867 assert(u);
2868
2869 return state_translation_table[SOCKET(u)->state];
2870 }
2871
2872 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2873 assert(u);
2874
2875 return socket_state_to_string(SOCKET(u)->state);
2876 }
2877
2878 const char* socket_port_type_to_string(SocketPort *p) {
2879
2880 assert(p);
2881
2882 switch (p->type) {
2883
2884 case SOCKET_SOCKET:
2885
2886 switch (p->address.type) {
2887
2888 case SOCK_STREAM:
2889 return "Stream";
2890
2891 case SOCK_DGRAM:
2892 return "Datagram";
2893
2894 case SOCK_SEQPACKET:
2895 return "SequentialPacket";
2896
2897 case SOCK_RAW:
2898 if (socket_address_family(&p->address) == AF_NETLINK)
2899 return "Netlink";
2900
2901 _fallthrough_;
2902 default:
2903 return NULL;
2904 }
2905
2906 case SOCKET_SPECIAL:
2907 return "Special";
2908
2909 case SOCKET_MQUEUE:
2910 return "MessageQueue";
2911
2912 case SOCKET_FIFO:
2913 return "FIFO";
2914
2915 case SOCKET_USB_FUNCTION:
2916 return "USBFunction";
2917
2918 default:
2919 return NULL;
2920 }
2921 }
2922
2923 SocketType socket_port_type_from_string(const char *s) {
2924 assert(s);
2925
2926 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2927 return SOCKET_SOCKET;
2928 else if (streq(s, "Special"))
2929 return SOCKET_SPECIAL;
2930 else if (streq(s, "MessageQueue"))
2931 return SOCKET_MQUEUE;
2932 else if (streq(s, "FIFO"))
2933 return SOCKET_FIFO;
2934 else if (streq(s, "USBFunction"))
2935 return SOCKET_USB_FUNCTION;
2936 else
2937 return _SOCKET_TYPE_INVALID;
2938 }
2939
2940 _pure_ static bool socket_may_gc(Unit *u) {
2941 Socket *s = SOCKET(u);
2942
2943 assert(u);
2944
2945 return s->n_connections == 0;
2946 }
2947
2948 static int socket_accept_do(Socket *s, int fd) {
2949 int cfd;
2950
2951 assert(s);
2952 assert(fd >= 0);
2953
2954 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2955 if (cfd < 0)
2956 /* Convert transient network errors into clean and well-defined EAGAIN */
2957 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2958
2959 return cfd;
2960 }
2961
2962 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2963 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2964 int cfd, r;
2965 pid_t pid;
2966
2967 assert(s);
2968 assert(p);
2969 assert(fd >= 0);
2970
2971 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2972 * connection socket is also properly associated with the cgroup. */
2973
2974 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2975 goto shortcut;
2976
2977 r = bpf_firewall_supported();
2978 if (r < 0)
2979 return r;
2980 if (r == BPF_FIREWALL_UNSUPPORTED)
2981 goto shortcut;
2982
2983 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2984 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2985
2986 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2987 if (r < 0)
2988 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2989 if (r == 0) {
2990 /* Child */
2991
2992 pair[0] = safe_close(pair[0]);
2993
2994 cfd = socket_accept_do(s, fd);
2995 if (cfd == -EAGAIN) /* spurious accept() */
2996 _exit(EXIT_SUCCESS);
2997 if (cfd < 0) {
2998 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2999 _exit(EXIT_FAILURE);
3000 }
3001
3002 r = send_one_fd(pair[1], cfd, 0);
3003 if (r < 0) {
3004 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3005 _exit(EXIT_FAILURE);
3006 }
3007
3008 _exit(EXIT_SUCCESS);
3009 }
3010
3011 pair[1] = safe_close(pair[1]);
3012 cfd = receive_one_fd(pair[0], 0);
3013
3014 /* We synchronously wait for the helper, as it shouldn't be slow */
3015 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3016 if (r < 0) {
3017 safe_close(cfd);
3018 return r;
3019 }
3020
3021 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3022 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3023 if (cfd == -EIO)
3024 return -EAGAIN;
3025 if (cfd < 0)
3026 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3027
3028 return cfd;
3029
3030 shortcut:
3031 cfd = socket_accept_do(s, fd);
3032 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3033 return -EAGAIN;
3034 if (cfd < 0)
3035 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3036
3037 return cfd;
3038 }
3039
3040 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3041 SocketPort *p = ASSERT_PTR(userdata);
3042 int cfd = -EBADF;
3043
3044 assert(fd >= 0);
3045
3046 if (p->socket->state != SOCKET_LISTENING)
3047 return 0;
3048
3049 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3050
3051 if (revents != EPOLLIN) {
3052 if (revents & EPOLLHUP)
3053 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.");
3054 else
3055 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3056 goto fail;
3057 }
3058
3059 if (p->socket->accept &&
3060 p->type == SOCKET_SOCKET &&
3061 socket_address_can_accept(&p->address)) {
3062
3063 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3064 if (cfd == -EAGAIN) /* Spurious accept() */
3065 return 0;
3066 if (cfd < 0)
3067 goto fail;
3068
3069 socket_apply_socket_options(p->socket, p, cfd);
3070 }
3071
3072 socket_enter_running(p->socket, cfd);
3073 return 0;
3074
3075 fail:
3076 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3077 return 0;
3078 }
3079
3080 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3081 Socket *s = SOCKET(u);
3082 SocketResult f;
3083
3084 assert(s);
3085 assert(pid >= 0);
3086
3087 if (pid != s->control_pid)
3088 return;
3089
3090 s->control_pid = 0;
3091
3092 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3093 f = SOCKET_SUCCESS;
3094 else if (code == CLD_EXITED)
3095 f = SOCKET_FAILURE_EXIT_CODE;
3096 else if (code == CLD_KILLED)
3097 f = SOCKET_FAILURE_SIGNAL;
3098 else if (code == CLD_DUMPED)
3099 f = SOCKET_FAILURE_CORE_DUMP;
3100 else
3101 assert_not_reached();
3102
3103 if (s->control_command) {
3104 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3105
3106 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3107 f = SOCKET_SUCCESS;
3108 }
3109
3110 unit_log_process_exit(
3111 u,
3112 "Control process",
3113 socket_exec_command_to_string(s->control_command_id),
3114 f == SOCKET_SUCCESS,
3115 code, status);
3116
3117 if (s->result == SOCKET_SUCCESS)
3118 s->result = f;
3119
3120 if (s->control_command &&
3121 s->control_command->command_next &&
3122 f == SOCKET_SUCCESS) {
3123
3124 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3125 socket_run_next(s);
3126 } else {
3127 s->control_command = NULL;
3128 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3129
3130 /* No further commands for this step, so let's figure
3131 * out what to do next */
3132
3133 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3134
3135 switch (s->state) {
3136
3137 case SOCKET_START_PRE:
3138 if (f == SOCKET_SUCCESS)
3139 socket_enter_start_chown(s);
3140 else
3141 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3142 break;
3143
3144 case SOCKET_START_CHOWN:
3145 if (f == SOCKET_SUCCESS)
3146 socket_enter_start_post(s);
3147 else
3148 socket_enter_stop_pre(s, f);
3149 break;
3150
3151 case SOCKET_START_POST:
3152 if (f == SOCKET_SUCCESS)
3153 socket_enter_listening(s);
3154 else
3155 socket_enter_stop_pre(s, f);
3156 break;
3157
3158 case SOCKET_STOP_PRE:
3159 case SOCKET_STOP_PRE_SIGTERM:
3160 case SOCKET_STOP_PRE_SIGKILL:
3161 socket_enter_stop_post(s, f);
3162 break;
3163
3164 case SOCKET_STOP_POST:
3165 case SOCKET_FINAL_SIGTERM:
3166 case SOCKET_FINAL_SIGKILL:
3167 socket_enter_dead(s, f);
3168 break;
3169
3170 case SOCKET_CLEANING:
3171
3172 if (s->clean_result == SOCKET_SUCCESS)
3173 s->clean_result = f;
3174
3175 socket_enter_dead(s, SOCKET_SUCCESS);
3176 break;
3177
3178 default:
3179 assert_not_reached();
3180 }
3181 }
3182
3183 /* Notify clients about changed exit status */
3184 unit_add_to_dbus_queue(u);
3185 }
3186
3187 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3188 Socket *s = SOCKET(userdata);
3189
3190 assert(s);
3191 assert(s->timer_event_source == source);
3192
3193 switch (s->state) {
3194
3195 case SOCKET_START_PRE:
3196 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3197 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3198 break;
3199
3200 case SOCKET_START_CHOWN:
3201 case SOCKET_START_POST:
3202 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3203 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3204 break;
3205
3206 case SOCKET_STOP_PRE:
3207 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3208 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3209 break;
3210
3211 case SOCKET_STOP_PRE_SIGTERM:
3212 if (s->kill_context.send_sigkill) {
3213 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3214 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3215 } else {
3216 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3217 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3218 }
3219 break;
3220
3221 case SOCKET_STOP_PRE_SIGKILL:
3222 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3223 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3224 break;
3225
3226 case SOCKET_STOP_POST:
3227 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3228 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3229 break;
3230
3231 case SOCKET_FINAL_SIGTERM:
3232 if (s->kill_context.send_sigkill) {
3233 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3234 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3235 } else {
3236 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3237 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3238 }
3239 break;
3240
3241 case SOCKET_FINAL_SIGKILL:
3242 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3243 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3244 break;
3245
3246 case SOCKET_CLEANING:
3247 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3248
3249 if (s->clean_result == SOCKET_SUCCESS)
3250 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3251
3252 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3253 break;
3254
3255 default:
3256 assert_not_reached();
3257 }
3258
3259 return 0;
3260 }
3261
3262 int socket_collect_fds(Socket *s, int **fds) {
3263 size_t k = 0, n = 0;
3264 int *rfds;
3265
3266 assert(s);
3267 assert(fds);
3268
3269 /* Called from the service code for requesting our fds */
3270
3271 LIST_FOREACH(port, p, s->ports) {
3272 if (p->fd >= 0)
3273 n++;
3274 n += p->n_auxiliary_fds;
3275 }
3276
3277 if (n <= 0) {
3278 *fds = NULL;
3279 return 0;
3280 }
3281
3282 rfds = new(int, n);
3283 if (!rfds)
3284 return -ENOMEM;
3285
3286 LIST_FOREACH(port, p, s->ports) {
3287 if (p->fd >= 0)
3288 rfds[k++] = p->fd;
3289 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3290 rfds[k++] = p->auxiliary_fds[i];
3291 }
3292
3293 assert(k == n);
3294
3295 *fds = rfds;
3296 return (int) n;
3297 }
3298
3299 static void socket_reset_failed(Unit *u) {
3300 Socket *s = SOCKET(u);
3301
3302 assert(s);
3303
3304 if (s->state == SOCKET_FAILED)
3305 socket_set_state(s, SOCKET_DEAD);
3306
3307 s->result = SOCKET_SUCCESS;
3308 s->clean_result = SOCKET_SUCCESS;
3309 }
3310
3311 void socket_connection_unref(Socket *s) {
3312 assert(s);
3313
3314 /* The service is dead. Yay!
3315 *
3316 * This is strictly for one-instance-per-connection
3317 * services. */
3318
3319 assert(s->n_connections > 0);
3320 s->n_connections--;
3321
3322 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3323 }
3324
3325 static void socket_trigger_notify(Unit *u, Unit *other) {
3326 Socket *s = SOCKET(u);
3327
3328 assert(u);
3329 assert(other);
3330
3331 /* Filter out invocations with bogus state */
3332 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3333 assert(other->type == UNIT_SERVICE);
3334
3335 /* Don't propagate state changes from the service if we are already down */
3336 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3337 return;
3338
3339 /* We don't care for the service state if we are in Accept=yes mode */
3340 if (s->accept)
3341 return;
3342
3343 /* Propagate start limit hit state */
3344 if (other->start_limit_hit) {
3345 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3346 return;
3347 }
3348
3349 /* Don't propagate anything if there's still a job queued */
3350 if (other->job)
3351 return;
3352
3353 if (IN_SET(SERVICE(other)->state,
3354 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3355 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3356 SERVICE_AUTO_RESTART))
3357 socket_enter_listening(s);
3358
3359 if (SERVICE(other)->state == SERVICE_RUNNING)
3360 socket_set_state(s, SOCKET_RUNNING);
3361 }
3362
3363 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3364 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid, error);
3365 }
3366
3367 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3368 Socket *s = SOCKET(u);
3369 usec_t t;
3370 int r;
3371
3372 if (!s->timer_event_source)
3373 return 0;
3374
3375 r = sd_event_source_get_time(s->timer_event_source, &t);
3376 if (r < 0)
3377 return r;
3378 if (t == USEC_INFINITY)
3379 return 0;
3380
3381 *timeout = t;
3382 return 1;
3383 }
3384
3385 char *socket_fdname(Socket *s) {
3386 assert(s);
3387
3388 /* Returns the name to use for $LISTEN_NAMES. If the user
3389 * didn't specify anything specifically, use the socket unit's
3390 * name as fallback. */
3391
3392 return s->fdname ?: UNIT(s)->id;
3393 }
3394
3395 static int socket_control_pid(Unit *u) {
3396 Socket *s = SOCKET(u);
3397
3398 assert(s);
3399
3400 return s->control_pid;
3401 }
3402
3403 static int socket_clean(Unit *u, ExecCleanMask mask) {
3404 _cleanup_strv_free_ char **l = NULL;
3405 Socket *s = SOCKET(u);
3406 int r;
3407
3408 assert(s);
3409 assert(mask != 0);
3410
3411 if (s->state != SOCKET_DEAD)
3412 return -EBUSY;
3413
3414 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3415 if (r < 0)
3416 return r;
3417
3418 if (strv_isempty(l))
3419 return -EUNATCH;
3420
3421 socket_unwatch_control_pid(s);
3422 s->clean_result = SOCKET_SUCCESS;
3423 s->control_command = NULL;
3424 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3425
3426 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3427 if (r < 0)
3428 goto fail;
3429
3430 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3431 if (r < 0)
3432 goto fail;
3433
3434 socket_set_state(s, SOCKET_CLEANING);
3435
3436 return 0;
3437
3438 fail:
3439 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3440 s->clean_result = SOCKET_FAILURE_RESOURCES;
3441 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3442 return r;
3443 }
3444
3445 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3446 Socket *s = SOCKET(u);
3447
3448 assert(s);
3449
3450 return exec_context_get_clean_mask(&s->exec_context, ret);
3451 }
3452
3453 static int socket_can_start(Unit *u) {
3454 Socket *s = SOCKET(u);
3455 int r;
3456
3457 assert(s);
3458
3459 r = unit_test_start_limit(u);
3460 if (r < 0) {
3461 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3462 return r;
3463 }
3464
3465 return 1;
3466 }
3467
3468 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3469 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3470 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3471 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3472 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3473 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3474 };
3475
3476 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3477
3478 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3479 [SOCKET_SUCCESS] = "success",
3480 [SOCKET_FAILURE_RESOURCES] = "resources",
3481 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3482 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3483 [SOCKET_FAILURE_SIGNAL] = "signal",
3484 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3485 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3486 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3487 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3488 };
3489
3490 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3491
3492 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3493 [SOCKET_TIMESTAMPING_OFF] = "off",
3494 [SOCKET_TIMESTAMPING_US] = "us",
3495 [SOCKET_TIMESTAMPING_NS] = "ns",
3496 };
3497
3498 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3499
3500 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3501 SocketTimestamping t;
3502 int r;
3503
3504 if (!p)
3505 return _SOCKET_TIMESTAMPING_INVALID;
3506
3507 t = socket_timestamping_from_string(p);
3508 if (t >= 0)
3509 return t;
3510
3511 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3512 * too. */
3513 if (streq(p, "nsec"))
3514 return SOCKET_TIMESTAMPING_NS;
3515 if (STR_IN_SET(p, "usec", "µs"))
3516 return SOCKET_TIMESTAMPING_US;
3517
3518 r = parse_boolean(p);
3519 if (r < 0)
3520 return _SOCKET_TIMESTAMPING_INVALID;
3521
3522 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3523 }
3524
3525 const UnitVTable socket_vtable = {
3526 .object_size = sizeof(Socket),
3527 .exec_context_offset = offsetof(Socket, exec_context),
3528 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3529 .kill_context_offset = offsetof(Socket, kill_context),
3530 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3531
3532 .sections =
3533 "Unit\0"
3534 "Socket\0"
3535 "Install\0",
3536 .private_section = "Socket",
3537
3538 .can_transient = true,
3539 .can_trigger = true,
3540 .can_fail = true,
3541
3542 .init = socket_init,
3543 .done = socket_done,
3544 .load = socket_load,
3545
3546 .coldplug = socket_coldplug,
3547
3548 .dump = socket_dump,
3549
3550 .start = socket_start,
3551 .stop = socket_stop,
3552
3553 .kill = socket_kill,
3554 .clean = socket_clean,
3555 .can_clean = socket_can_clean,
3556
3557 .get_timeout = socket_get_timeout,
3558
3559 .serialize = socket_serialize,
3560 .deserialize_item = socket_deserialize_item,
3561 .distribute_fds = socket_distribute_fds,
3562
3563 .active_state = socket_active_state,
3564 .sub_state_to_string = socket_sub_state_to_string,
3565
3566 .will_restart = unit_will_restart_default,
3567
3568 .may_gc = socket_may_gc,
3569
3570 .sigchld_event = socket_sigchld_event,
3571
3572 .trigger_notify = socket_trigger_notify,
3573
3574 .reset_failed = socket_reset_failed,
3575
3576 .control_pid = socket_control_pid,
3577
3578 .bus_set_property = bus_socket_set_property,
3579 .bus_commit_properties = bus_socket_commit_properties,
3580
3581 .status_message_formats = {
3582 .finished_start_job = {
3583 [JOB_DONE] = "Listening on %s.",
3584 [JOB_FAILED] = "Failed to listen on %s.",
3585 [JOB_TIMEOUT] = "Timed out starting %s.",
3586 },
3587 .finished_stop_job = {
3588 [JOB_DONE] = "Closed %s.",
3589 [JOB_FAILED] = "Failed stopping %s.",
3590 [JOB_TIMEOUT] = "Timed out stopping %s.",
3591 },
3592 },
3593
3594 .can_start = socket_can_start,
3595 };
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