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Merge pull request #27927 from Geass-LL/main
[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-util.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_DELUXE;
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 SocketPort *socket_port_free(SocketPort *p) {
124 if (!p)
125 return NULL;
126
127 sd_event_source_unref(p->event_source);
128
129 socket_cleanup_fd_list(p);
130 safe_close(p->fd);
131 free(p->path);
132
133 return mfree(p);
134 }
135
136 void socket_free_ports(Socket *s) {
137 SocketPort *p;
138
139 assert(s);
140
141 while ((p = s->ports)) {
142 LIST_REMOVE(port, s->ports, p);
143 socket_port_free(p);
144 }
145 }
146
147 static void socket_done(Unit *u) {
148 Socket *s = SOCKET(u);
149 SocketPeer *p;
150
151 assert(s);
152
153 socket_free_ports(s);
154
155 while ((p = set_steal_first(s->peers_by_address)))
156 p->socket = NULL;
157
158 s->peers_by_address = set_free(s->peers_by_address);
159
160 s->exec_runtime = exec_runtime_free(s->exec_runtime);
161 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
162 s->control_command = NULL;
163
164 socket_unwatch_control_pid(s);
165
166 unit_ref_unset(&s->service);
167
168 s->tcp_congestion = mfree(s->tcp_congestion);
169 s->bind_to_device = mfree(s->bind_to_device);
170
171 s->smack = mfree(s->smack);
172 s->smack_ip_in = mfree(s->smack_ip_in);
173 s->smack_ip_out = mfree(s->smack_ip_out);
174
175 strv_free(s->symlinks);
176
177 s->user = mfree(s->user);
178 s->group = mfree(s->group);
179
180 s->fdname = mfree(s->fdname);
181
182 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
183 }
184
185 static int socket_arm_timer(Socket *s, usec_t usec) {
186 int r;
187
188 assert(s);
189
190 if (s->timer_event_source) {
191 r = sd_event_source_set_time(s->timer_event_source, usec);
192 if (r < 0)
193 return r;
194
195 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
196 }
197
198 if (usec == USEC_INFINITY)
199 return 0;
200
201 r = sd_event_add_time(
202 UNIT(s)->manager->event,
203 &s->timer_event_source,
204 CLOCK_MONOTONIC,
205 usec, 0,
206 socket_dispatch_timer, s);
207 if (r < 0)
208 return r;
209
210 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
211
212 return 0;
213 }
214
215 static bool have_non_accept_socket(Socket *s) {
216 assert(s);
217
218 if (!s->accept)
219 return true;
220
221 LIST_FOREACH(port, p, s->ports) {
222
223 if (p->type != SOCKET_SOCKET)
224 return true;
225
226 if (!socket_address_can_accept(&p->address))
227 return true;
228 }
229
230 return false;
231 }
232
233 static int socket_add_mount_dependencies(Socket *s) {
234 int r;
235
236 assert(s);
237
238 LIST_FOREACH(port, p, s->ports) {
239 const char *path = NULL;
240
241 if (p->type == SOCKET_SOCKET)
242 path = socket_address_get_path(&p->address);
243 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
244 path = p->path;
245
246 if (!path)
247 continue;
248
249 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
250 if (r < 0)
251 return r;
252 }
253
254 return 0;
255 }
256
257 static int socket_add_device_dependencies(Socket *s) {
258 char *t;
259
260 assert(s);
261
262 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
263 return 0;
264
265 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
266 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
267 }
268
269 static int socket_add_default_dependencies(Socket *s) {
270 int r;
271 assert(s);
272
273 if (!UNIT(s)->default_dependencies)
274 return 0;
275
276 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279
280 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
281 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 if (r < 0)
283 return r;
284 }
285
286 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
287 if (r < 0)
288 return r;
289
290 return exec_context_add_default_dependencies(UNIT(s), &s->exec_context);
291 }
292
293 _pure_ static bool socket_has_exec(Socket *s) {
294 unsigned i;
295 assert(s);
296
297 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
298 if (s->exec_command[i])
299 return true;
300
301 return false;
302 }
303
304 static int socket_add_extras(Socket *s) {
305 Unit *u = UNIT(s);
306 int r;
307
308 assert(s);
309
310 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
311 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
312 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
313 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
314 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
315 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
316 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
317 * service starts are typical. */
318
319 if (s->trigger_limit.interval == USEC_INFINITY)
320 s->trigger_limit.interval = 2 * USEC_PER_SEC;
321
322 if (s->trigger_limit.burst == UINT_MAX) {
323 if (s->accept)
324 s->trigger_limit.burst = 200;
325 else
326 s->trigger_limit.burst = 20;
327 }
328
329 if (have_non_accept_socket(s)) {
330
331 if (!UNIT_DEREF(s->service)) {
332 Unit *x;
333
334 r = unit_load_related_unit(u, ".service", &x);
335 if (r < 0)
336 return r;
337
338 unit_ref_set(&s->service, u, x);
339 }
340
341 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
342 if (r < 0)
343 return r;
344 }
345
346 r = socket_add_mount_dependencies(s);
347 if (r < 0)
348 return r;
349
350 r = socket_add_device_dependencies(s);
351 if (r < 0)
352 return r;
353
354 r = unit_patch_contexts(u);
355 if (r < 0)
356 return r;
357
358 if (socket_has_exec(s)) {
359 r = unit_add_exec_dependencies(u, &s->exec_context);
360 if (r < 0)
361 return r;
362 }
363
364 r = unit_set_default_slice(u);
365 if (r < 0)
366 return r;
367
368 r = socket_add_default_dependencies(s);
369 if (r < 0)
370 return r;
371
372 return 0;
373 }
374
375 static const char *socket_find_symlink_target(Socket *s) {
376 const char *found = NULL;
377
378 LIST_FOREACH(port, p, s->ports) {
379 const char *f = NULL;
380
381 switch (p->type) {
382
383 case SOCKET_FIFO:
384 f = p->path;
385 break;
386
387 case SOCKET_SOCKET:
388 f = socket_address_get_path(&p->address);
389 break;
390
391 default:
392 break;
393 }
394
395 if (f) {
396 if (found)
397 return NULL;
398
399 found = f;
400 }
401 }
402
403 return found;
404 }
405
406 static int socket_verify(Socket *s) {
407 assert(s);
408 assert(UNIT(s)->load_state == UNIT_LOADED);
409
410 if (!s->ports)
411 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
412
413 if (s->accept && have_non_accept_socket(s))
414 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
415
416 if (s->accept && s->max_connections <= 0)
417 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
418
419 if (s->accept && UNIT_DEREF(s->service))
420 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
421
422 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
423 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
424
425 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
426 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.");
427
428 return 0;
429 }
430
431 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
432 assert(s);
433
434 if (s->peer.sa.sa_family == AF_INET)
435 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
436 else if (s->peer.sa.sa_family == AF_INET6)
437 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
438 else if (s->peer.sa.sa_family == AF_VSOCK)
439 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
440 else
441 assert_not_reached();
442 }
443
444 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
445 int r;
446
447 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
448 if (r != 0)
449 return r;
450
451 switch (x->peer.sa.sa_family) {
452 case AF_INET:
453 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
454 case AF_INET6:
455 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
456 case AF_VSOCK:
457 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
458 }
459 assert_not_reached();
460 }
461
462 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
463
464 static int socket_load(Unit *u) {
465 Socket *s = SOCKET(u);
466 int r;
467
468 assert(u);
469 assert(u->load_state == UNIT_STUB);
470
471 r = unit_load_fragment_and_dropin(u, true);
472 if (r < 0)
473 return r;
474
475 if (u->load_state != UNIT_LOADED)
476 return 0;
477
478 /* This is a new unit? Then let's add in some extras */
479 r = socket_add_extras(s);
480 if (r < 0)
481 return r;
482
483 return socket_verify(s);
484 }
485
486 static SocketPeer *socket_peer_new(void) {
487 SocketPeer *p;
488
489 p = new(SocketPeer, 1);
490 if (!p)
491 return NULL;
492
493 *p = (SocketPeer) {
494 .n_ref = 1,
495 };
496 return p;
497 }
498
499 static SocketPeer *socket_peer_free(SocketPeer *p) {
500 assert(p);
501
502 if (p->socket)
503 set_remove(p->socket->peers_by_address, p);
504
505 return mfree(p);
506 }
507
508 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
509
510 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
511 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
512 SocketPeer sa = {
513 .peer_salen = sizeof(union sockaddr_union),
514 }, *i;
515 int r;
516
517 assert(fd >= 0);
518 assert(s);
519
520 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
521 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
522
523 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
524 *p = NULL;
525 return 0;
526 }
527
528 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
529 if (r < 0)
530 return r;
531
532 i = set_get(s->peers_by_address, &sa);
533 if (i) {
534 *p = socket_peer_ref(i);
535 return 1;
536 }
537
538 remote = socket_peer_new();
539 if (!remote)
540 return log_oom();
541
542 remote->peer = sa.peer;
543 remote->peer_salen = sa.peer_salen;
544
545 r = set_put(s->peers_by_address, remote);
546 if (r < 0)
547 return r;
548
549 remote->socket = s;
550
551 *p = TAKE_PTR(remote);
552 return 1;
553 }
554
555 _const_ static const char* listen_lookup(int family, int type) {
556
557 if (family == AF_NETLINK)
558 return "ListenNetlink";
559
560 if (type == SOCK_STREAM)
561 return "ListenStream";
562 else if (type == SOCK_DGRAM)
563 return "ListenDatagram";
564 else if (type == SOCK_SEQPACKET)
565 return "ListenSequentialPacket";
566
567 assert_not_reached();
568 return NULL;
569 }
570
571 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
572 Socket *s = SOCKET(u);
573 const char *prefix2, *str;
574
575 assert(s);
576 assert(f);
577
578 prefix = strempty(prefix);
579 prefix2 = strjoina(prefix, "\t");
580
581 fprintf(f,
582 "%sSocket State: %s\n"
583 "%sResult: %s\n"
584 "%sClean Result: %s\n"
585 "%sBindIPv6Only: %s\n"
586 "%sBacklog: %u\n"
587 "%sSocketMode: %04o\n"
588 "%sDirectoryMode: %04o\n"
589 "%sKeepAlive: %s\n"
590 "%sNoDelay: %s\n"
591 "%sFreeBind: %s\n"
592 "%sTransparent: %s\n"
593 "%sBroadcast: %s\n"
594 "%sPassCredentials: %s\n"
595 "%sPassSecurity: %s\n"
596 "%sPassPacketInfo: %s\n"
597 "%sTCPCongestion: %s\n"
598 "%sRemoveOnStop: %s\n"
599 "%sWritable: %s\n"
600 "%sFileDescriptorName: %s\n"
601 "%sSELinuxContextFromNet: %s\n",
602 prefix, socket_state_to_string(s->state),
603 prefix, socket_result_to_string(s->result),
604 prefix, socket_result_to_string(s->clean_result),
605 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
606 prefix, s->backlog,
607 prefix, s->socket_mode,
608 prefix, s->directory_mode,
609 prefix, yes_no(s->keep_alive),
610 prefix, yes_no(s->no_delay),
611 prefix, yes_no(s->free_bind),
612 prefix, yes_no(s->transparent),
613 prefix, yes_no(s->broadcast),
614 prefix, yes_no(s->pass_cred),
615 prefix, yes_no(s->pass_sec),
616 prefix, yes_no(s->pass_pktinfo),
617 prefix, strna(s->tcp_congestion),
618 prefix, yes_no(s->remove_on_stop),
619 prefix, yes_no(s->writable),
620 prefix, socket_fdname(s),
621 prefix, yes_no(s->selinux_context_from_net));
622
623 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
624 fprintf(f,
625 "%sTimestamping: %s\n",
626 prefix, socket_timestamping_to_string(s->timestamping));
627
628 if (s->control_pid > 0)
629 fprintf(f,
630 "%sControl PID: "PID_FMT"\n",
631 prefix, s->control_pid);
632
633 if (s->bind_to_device)
634 fprintf(f,
635 "%sBindToDevice: %s\n",
636 prefix, s->bind_to_device);
637
638 if (s->accept)
639 fprintf(f,
640 "%sAccepted: %u\n"
641 "%sNConnections: %u\n"
642 "%sMaxConnections: %u\n"
643 "%sMaxConnectionsPerSource: %u\n",
644 prefix, s->n_accepted,
645 prefix, s->n_connections,
646 prefix, s->max_connections,
647 prefix, s->max_connections_per_source);
648 else
649 fprintf(f,
650 "%sFlushPending: %s\n",
651 prefix, yes_no(s->flush_pending));
652
653
654 if (s->priority >= 0)
655 fprintf(f,
656 "%sPriority: %i\n",
657 prefix, s->priority);
658
659 if (s->receive_buffer > 0)
660 fprintf(f,
661 "%sReceiveBuffer: %zu\n",
662 prefix, s->receive_buffer);
663
664 if (s->send_buffer > 0)
665 fprintf(f,
666 "%sSendBuffer: %zu\n",
667 prefix, s->send_buffer);
668
669 if (s->ip_tos >= 0)
670 fprintf(f,
671 "%sIPTOS: %i\n",
672 prefix, s->ip_tos);
673
674 if (s->ip_ttl >= 0)
675 fprintf(f,
676 "%sIPTTL: %i\n",
677 prefix, s->ip_ttl);
678
679 if (s->pipe_size > 0)
680 fprintf(f,
681 "%sPipeSize: %zu\n",
682 prefix, s->pipe_size);
683
684 if (s->mark >= 0)
685 fprintf(f,
686 "%sMark: %i\n",
687 prefix, s->mark);
688
689 if (s->mq_maxmsg > 0)
690 fprintf(f,
691 "%sMessageQueueMaxMessages: %li\n",
692 prefix, s->mq_maxmsg);
693
694 if (s->mq_msgsize > 0)
695 fprintf(f,
696 "%sMessageQueueMessageSize: %li\n",
697 prefix, s->mq_msgsize);
698
699 if (s->reuse_port)
700 fprintf(f,
701 "%sReusePort: %s\n",
702 prefix, yes_no(s->reuse_port));
703
704 if (s->smack)
705 fprintf(f,
706 "%sSmackLabel: %s\n",
707 prefix, s->smack);
708
709 if (s->smack_ip_in)
710 fprintf(f,
711 "%sSmackLabelIPIn: %s\n",
712 prefix, s->smack_ip_in);
713
714 if (s->smack_ip_out)
715 fprintf(f,
716 "%sSmackLabelIPOut: %s\n",
717 prefix, s->smack_ip_out);
718
719 if (!isempty(s->user) || !isempty(s->group))
720 fprintf(f,
721 "%sSocketUser: %s\n"
722 "%sSocketGroup: %s\n",
723 prefix, strna(s->user),
724 prefix, strna(s->group));
725
726 if (timestamp_is_set(s->keep_alive_time))
727 fprintf(f,
728 "%sKeepAliveTimeSec: %s\n",
729 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
730
731 if (s->keep_alive_interval > 0)
732 fprintf(f,
733 "%sKeepAliveIntervalSec: %s\n",
734 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
735
736 if (s->keep_alive_cnt > 0)
737 fprintf(f,
738 "%sKeepAliveProbes: %u\n",
739 prefix, s->keep_alive_cnt);
740
741 if (s->defer_accept > 0)
742 fprintf(f,
743 "%sDeferAcceptSec: %s\n",
744 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
745
746 LIST_FOREACH(port, p, s->ports) {
747
748 switch (p->type) {
749 case SOCKET_SOCKET: {
750 _cleanup_free_ char *k = NULL;
751 int r;
752
753 r = socket_address_print(&p->address, &k);
754 if (r < 0) {
755 errno = -r;
756 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
757 } else
758 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
759 break;
760 }
761 case SOCKET_SPECIAL:
762 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
763 break;
764 case SOCKET_USB_FUNCTION:
765 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
766 break;
767 case SOCKET_MQUEUE:
768 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
769 break;
770 default:
771 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
772 }
773 }
774
775 fprintf(f,
776 "%sTriggerLimitIntervalSec: %s\n"
777 "%sTriggerLimitBurst: %u\n",
778 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
779 prefix, s->trigger_limit.burst);
780
781 str = ip_protocol_to_name(s->socket_protocol);
782 if (str)
783 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
784
785 if (!strv_isempty(s->symlinks)) {
786 fprintf(f, "%sSymlinks:", prefix);
787 STRV_FOREACH(q, s->symlinks)
788 fprintf(f, " %s", *q);
789
790 fprintf(f, "\n");
791 }
792
793 fprintf(f,
794 "%sTimeoutSec: %s\n",
795 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
796
797 exec_context_dump(&s->exec_context, f, prefix);
798 kill_context_dump(&s->kill_context, f, prefix);
799
800 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
801 if (!s->exec_command[c])
802 continue;
803
804 fprintf(f, "%s-> %s:\n",
805 prefix, socket_exec_command_to_string(c));
806
807 exec_command_dump_list(s->exec_command[c], f, prefix2);
808 }
809
810 cgroup_context_dump(UNIT(s), f, prefix);
811 }
812
813 static int instance_from_socket(int fd, unsigned nr, char **instance) {
814 socklen_t l;
815 char *r;
816 union sockaddr_union local, remote;
817
818 assert(fd >= 0);
819 assert(instance);
820
821 l = sizeof(local);
822 if (getsockname(fd, &local.sa, &l) < 0)
823 return -errno;
824
825 l = sizeof(remote);
826 if (getpeername(fd, &remote.sa, &l) < 0)
827 return -errno;
828
829 switch (local.sa.sa_family) {
830
831 case AF_INET: {
832 uint32_t
833 a = be32toh(local.in.sin_addr.s_addr),
834 b = be32toh(remote.in.sin_addr.s_addr);
835
836 if (asprintf(&r,
837 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
838 nr,
839 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
840 be16toh(local.in.sin_port),
841 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
842 be16toh(remote.in.sin_port)) < 0)
843 return -ENOMEM;
844
845 break;
846 }
847
848 case AF_INET6: {
849 static const unsigned char ipv4_prefix[] = {
850 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
851 };
852
853 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
854 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
855 const uint8_t
856 *a = local.in6.sin6_addr.s6_addr+12,
857 *b = remote.in6.sin6_addr.s6_addr+12;
858
859 if (asprintf(&r,
860 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
861 nr,
862 a[0], a[1], a[2], a[3],
863 be16toh(local.in6.sin6_port),
864 b[0], b[1], b[2], b[3],
865 be16toh(remote.in6.sin6_port)) < 0)
866 return -ENOMEM;
867 } else {
868 if (asprintf(&r,
869 "%u-%s:%u-%s:%u",
870 nr,
871 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
872 be16toh(local.in6.sin6_port),
873 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
874 be16toh(remote.in6.sin6_port)) < 0)
875 return -ENOMEM;
876 }
877
878 break;
879 }
880
881 case AF_UNIX: {
882 struct ucred ucred;
883 int k;
884
885 k = getpeercred(fd, &ucred);
886 if (k >= 0) {
887 if (asprintf(&r,
888 "%u-"PID_FMT"-"UID_FMT,
889 nr, ucred.pid, ucred.uid) < 0)
890 return -ENOMEM;
891 } else if (k == -ENODATA) {
892 /* This handles the case where somebody is
893 * connecting from another pid/uid namespace
894 * (e.g. from outside of our container). */
895 if (asprintf(&r,
896 "%u-unknown",
897 nr) < 0)
898 return -ENOMEM;
899 } else
900 return k;
901
902 break;
903 }
904
905 case AF_VSOCK:
906 if (asprintf(&r,
907 "%u-%u:%u-%u:%u",
908 nr,
909 local.vm.svm_cid, local.vm.svm_port,
910 remote.vm.svm_cid, remote.vm.svm_port) < 0)
911 return -ENOMEM;
912
913 break;
914
915 default:
916 assert_not_reached();
917 }
918
919 *instance = r;
920 return 0;
921 }
922
923 static void socket_close_fds(Socket *s) {
924 assert(s);
925
926 LIST_FOREACH(port, p, s->ports) {
927 bool was_open;
928
929 was_open = p->fd >= 0;
930
931 p->event_source = sd_event_source_disable_unref(p->event_source);
932 p->fd = safe_close(p->fd);
933 socket_cleanup_fd_list(p);
934
935 /* One little note: we should normally not delete any sockets in the file system here! After all some
936 * other process we spawned might still have a reference of this fd and wants to continue to use
937 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
938 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
939 * anyway, but only then. */
940
941 if (!was_open || !s->remove_on_stop)
942 continue;
943
944 switch (p->type) {
945
946 case SOCKET_FIFO:
947 (void) unlink(p->path);
948 break;
949
950 case SOCKET_MQUEUE:
951 (void) mq_unlink(p->path);
952 break;
953
954 case SOCKET_SOCKET:
955 (void) socket_address_unlink(&p->address);
956 break;
957
958 default:
959 break;
960 }
961 }
962
963 if (s->remove_on_stop)
964 STRV_FOREACH(i, s->symlinks)
965 (void) unlink(*i);
966
967 /* Note that we don't return NULL here, since s has not been freed. */
968 }
969
970 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
971 int r;
972
973 assert(s);
974 assert(p);
975 assert(fd >= 0);
976
977 if (s->keep_alive) {
978 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
979 if (r < 0)
980 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
981 }
982
983 if (timestamp_is_set(s->keep_alive_time)) {
984 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
985 if (r < 0)
986 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
987 }
988
989 if (s->keep_alive_interval > 0) {
990 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
991 if (r < 0)
992 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
993 }
994
995 if (s->keep_alive_cnt > 0) {
996 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
997 if (r < 0)
998 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
999 }
1000
1001 if (s->defer_accept > 0) {
1002 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1003 if (r < 0)
1004 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1005 }
1006
1007 if (s->no_delay) {
1008 if (s->socket_protocol == IPPROTO_SCTP) {
1009 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1010 if (r < 0)
1011 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1012 } else {
1013 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1014 if (r < 0)
1015 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1016 }
1017 }
1018
1019 if (s->broadcast) {
1020 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1021 if (r < 0)
1022 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1023 }
1024
1025 if (s->pass_cred) {
1026 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1027 if (r < 0)
1028 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1029 }
1030
1031 if (s->pass_sec) {
1032 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1033 if (r < 0)
1034 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1035 }
1036
1037 if (s->pass_pktinfo) {
1038 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1039 if (r < 0)
1040 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1041 }
1042
1043 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1044 r = setsockopt_int(fd, SOL_SOCKET,
1045 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1046 true);
1047 if (r < 0)
1048 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1049 }
1050
1051 if (s->priority >= 0) {
1052 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1053 if (r < 0)
1054 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1055 }
1056
1057 if (s->receive_buffer > 0) {
1058 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1059 if (r < 0)
1060 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1061 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1062 }
1063
1064 if (s->send_buffer > 0) {
1065 r = fd_set_sndbuf(fd, s->send_buffer, false);
1066 if (r < 0)
1067 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1068 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1069 }
1070
1071 if (s->mark >= 0) {
1072 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1073 if (r < 0)
1074 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1075 }
1076
1077 if (s->ip_tos >= 0) {
1078 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1079 if (r < 0)
1080 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1081 }
1082
1083 if (s->ip_ttl >= 0) {
1084 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1085 if (r < 0)
1086 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1087 }
1088
1089 if (s->tcp_congestion)
1090 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1091 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1092
1093 if (s->smack_ip_in) {
1094 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1095 if (r < 0)
1096 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1097 }
1098
1099 if (s->smack_ip_out) {
1100 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1101 if (r < 0)
1102 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1103 }
1104 }
1105
1106 static void socket_apply_fifo_options(Socket *s, int fd) {
1107 int r;
1108
1109 assert(s);
1110 assert(fd >= 0);
1111
1112 if (s->pipe_size > 0)
1113 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1114 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1115
1116 if (s->smack) {
1117 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1118 if (r < 0)
1119 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1120 }
1121 }
1122
1123 static int fifo_address_create(
1124 const char *path,
1125 mode_t directory_mode,
1126 mode_t socket_mode) {
1127
1128 _cleanup_close_ int fd = -EBADF;
1129 mode_t old_mask;
1130 struct stat st;
1131 int r;
1132
1133 assert(path);
1134
1135 (void) mkdir_parents_label(path, directory_mode);
1136
1137 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1138 if (r < 0)
1139 return r;
1140
1141 /* Enforce the right access mode for the fifo */
1142 old_mask = umask(~socket_mode);
1143
1144 /* Include the original umask in our mask */
1145 (void) umask(~socket_mode | old_mask);
1146
1147 r = mkfifo(path, socket_mode);
1148 (void) umask(old_mask);
1149
1150 if (r < 0 && errno != EEXIST) {
1151 r = -errno;
1152 goto fail;
1153 }
1154
1155 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1156 if (fd < 0) {
1157 r = -errno;
1158 goto fail;
1159 }
1160
1161 mac_selinux_create_file_clear();
1162
1163 if (fstat(fd, &st) < 0) {
1164 r = -errno;
1165 goto fail;
1166 }
1167
1168 if (!S_ISFIFO(st.st_mode) ||
1169 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1170 st.st_uid != getuid() ||
1171 st.st_gid != getgid()) {
1172 r = -EEXIST;
1173 goto fail;
1174 }
1175
1176 return TAKE_FD(fd);
1177
1178 fail:
1179 mac_selinux_create_file_clear();
1180 return r;
1181 }
1182
1183 static int special_address_create(const char *path, bool writable) {
1184 _cleanup_close_ int fd = -EBADF;
1185 struct stat st;
1186
1187 assert(path);
1188
1189 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1190 if (fd < 0)
1191 return -errno;
1192
1193 if (fstat(fd, &st) < 0)
1194 return -errno;
1195
1196 /* Check whether this is a /proc, /sys or /dev file or char device */
1197 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1198 return -EEXIST;
1199
1200 return TAKE_FD(fd);
1201 }
1202
1203 static int usbffs_address_create(const char *path) {
1204 _cleanup_close_ int fd = -EBADF;
1205 struct stat st;
1206
1207 assert(path);
1208
1209 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1210 if (fd < 0)
1211 return -errno;
1212
1213 if (fstat(fd, &st) < 0)
1214 return -errno;
1215
1216 /* Check whether this is a regular file (ffs endpoint) */
1217 if (!S_ISREG(st.st_mode))
1218 return -EEXIST;
1219
1220 return TAKE_FD(fd);
1221 }
1222
1223 static int mq_address_create(
1224 const char *path,
1225 mode_t mq_mode,
1226 long maxmsg,
1227 long msgsize) {
1228
1229 _cleanup_close_ int fd = -EBADF;
1230 struct stat st;
1231 mode_t old_mask;
1232 struct mq_attr _attr, *attr = NULL;
1233
1234 assert(path);
1235
1236 if (maxmsg > 0 && msgsize > 0) {
1237 _attr = (struct mq_attr) {
1238 .mq_flags = O_NONBLOCK,
1239 .mq_maxmsg = maxmsg,
1240 .mq_msgsize = msgsize,
1241 };
1242 attr = &_attr;
1243 }
1244
1245 /* Enforce the right access mode for the mq */
1246 old_mask = umask(~mq_mode);
1247
1248 /* Include the original umask in our mask */
1249 (void) umask(~mq_mode | old_mask);
1250 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1251 (void) umask(old_mask);
1252
1253 if (fd < 0)
1254 return -errno;
1255
1256 if (fstat(fd, &st) < 0)
1257 return -errno;
1258
1259 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1260 st.st_uid != getuid() ||
1261 st.st_gid != getgid())
1262 return -EEXIST;
1263
1264 return TAKE_FD(fd);
1265 }
1266
1267 static int socket_symlink(Socket *s) {
1268 const char *p;
1269 int r;
1270
1271 assert(s);
1272
1273 p = socket_find_symlink_target(s);
1274 if (!p)
1275 return 0;
1276
1277 STRV_FOREACH(i, s->symlinks) {
1278 (void) mkdir_parents_label(*i, s->directory_mode);
1279
1280 r = symlink_idempotent(p, *i, false);
1281
1282 if (r == -EEXIST && s->remove_on_stop) {
1283 /* If there's already something where we want to create the symlink, and the destructive
1284 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1285 * again. */
1286
1287 if (unlink(*i) >= 0)
1288 r = symlink_idempotent(p, *i, false);
1289 }
1290
1291 if (r < 0)
1292 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1293 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1294 }
1295
1296 return 0;
1297 }
1298
1299 static int usbffs_write_descs(int fd, Service *s) {
1300 int r;
1301
1302 if (!s->usb_function_descriptors || !s->usb_function_strings)
1303 return -EINVAL;
1304
1305 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1306 if (r < 0)
1307 return r;
1308
1309 return copy_file_fd(s->usb_function_strings, fd, 0);
1310 }
1311
1312 static int usbffs_select_ep(const struct dirent *d) {
1313 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1314 }
1315
1316 static int usbffs_dispatch_eps(SocketPort *p) {
1317 _cleanup_free_ struct dirent **ent = NULL;
1318 size_t n, k;
1319 int r;
1320
1321 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1322 if (r < 0)
1323 return -errno;
1324
1325 n = (size_t) r;
1326 p->auxiliary_fds = new(int, n);
1327 if (!p->auxiliary_fds) {
1328 r = -ENOMEM;
1329 goto clear;
1330 }
1331
1332 p->n_auxiliary_fds = n;
1333
1334 k = 0;
1335 for (size_t i = 0; i < n; ++i) {
1336 _cleanup_free_ char *ep = NULL;
1337
1338 ep = path_make_absolute(ent[i]->d_name, p->path);
1339 if (!ep) {
1340 r = -ENOMEM;
1341 goto fail;
1342 }
1343
1344 path_simplify(ep);
1345
1346 r = usbffs_address_create(ep);
1347 if (r < 0)
1348 goto fail;
1349
1350 p->auxiliary_fds[k++] = r;
1351 }
1352
1353 r = 0;
1354 goto clear;
1355
1356 fail:
1357 close_many(p->auxiliary_fds, k);
1358 p->auxiliary_fds = mfree(p->auxiliary_fds);
1359 p->n_auxiliary_fds = 0;
1360
1361 clear:
1362 for (size_t i = 0; i < n; ++i)
1363 free(ent[i]);
1364
1365 return r;
1366 }
1367
1368 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1369 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1370 *
1371 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1372 * instance name.
1373 */
1374
1375 if (UNIT_ISSET(s->service)) {
1376 *ret = UNIT_DEREF(s->service);
1377 return 0;
1378 }
1379
1380 if (!s->accept)
1381 return -ENODATA;
1382
1383 /* Build the instance name and load the unit */
1384 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1385 int r;
1386
1387 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1388 if (r < 0)
1389 return r;
1390
1391 if (cfd >= 0) {
1392 r = instance_from_socket(cfd, s->n_accepted, &instance);
1393 if (ERRNO_IS_DISCONNECT(r))
1394 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1395 * different errors. This connection is over, but the socket unit lives on. */
1396 return log_unit_debug_errno(UNIT(s), r,
1397 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1398 errno_to_name(r));
1399 if (r < 0)
1400 return r;
1401 }
1402
1403 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1404 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1405 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1406 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1407 if (r < 0)
1408 return r;
1409
1410 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1411 }
1412
1413 static int socket_determine_selinux_label(Socket *s, char **ret) {
1414 int r;
1415
1416 assert(s);
1417 assert(ret);
1418
1419 Unit *service;
1420 ExecCommand *c;
1421 const char *exec_context;
1422 _cleanup_free_ char *path = NULL;
1423
1424 r = socket_load_service_unit(s, -1, &service);
1425 if (r == -ENODATA)
1426 goto no_label;
1427 if (r < 0)
1428 return r;
1429
1430 exec_context = SERVICE(service)->exec_context.selinux_context;
1431 if (exec_context) {
1432 char *con;
1433
1434 con = strdup(exec_context);
1435 if (!con)
1436 return -ENOMEM;
1437
1438 *ret = TAKE_PTR(con);
1439 return 0;
1440 }
1441
1442 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1443 if (!c)
1444 goto no_label;
1445
1446 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1447 if (r < 0)
1448 goto no_label;
1449
1450 r = mac_selinux_get_create_label_from_exe(path, ret);
1451 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1452 goto no_label;
1453 return r;
1454
1455 no_label:
1456 *ret = NULL;
1457 return 0;
1458 }
1459
1460 static int socket_address_listen_do(
1461 Socket *s,
1462 const SocketAddress *address,
1463 const char *label) {
1464
1465 assert(s);
1466 assert(address);
1467
1468 return socket_address_listen(
1469 address,
1470 SOCK_CLOEXEC|SOCK_NONBLOCK,
1471 s->backlog,
1472 s->bind_ipv6_only,
1473 s->bind_to_device,
1474 s->reuse_port,
1475 s->free_bind,
1476 s->transparent,
1477 s->directory_mode,
1478 s->socket_mode,
1479 label);
1480 }
1481
1482 #define log_address_error_errno(u, address, error, fmt) \
1483 ({ \
1484 _cleanup_free_ char *_t = NULL; \
1485 \
1486 (void) socket_address_print(address, &_t); \
1487 log_unit_error_errno(u, error, fmt, strna(_t)); \
1488 })
1489
1490 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1491 int r;
1492
1493 assert(address);
1494 assert(context);
1495
1496 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1497
1498 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1499 r = bpf_firewall_supported();
1500 if (r < 0)
1501 return r;
1502 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1503 return true;
1504 }
1505
1506 return exec_needs_network_namespace(context);
1507 }
1508
1509 static int socket_address_listen_in_cgroup(
1510 Socket *s,
1511 const SocketAddress *address,
1512 const char *label) {
1513
1514 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1515 int fd, r;
1516 pid_t pid;
1517
1518 assert(s);
1519 assert(address);
1520
1521 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1522 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1523 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1524 * such. */
1525
1526 r = fork_needed(address, &s->exec_context);
1527 if (r < 0)
1528 return r;
1529 if (r == 0) {
1530 /* Shortcut things... */
1531 fd = socket_address_listen_do(s, address, label);
1532 if (fd < 0)
1533 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1534
1535 return fd;
1536 }
1537
1538 r = unit_setup_exec_runtime(UNIT(s));
1539 if (r < 0)
1540 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1541
1542 if (s->exec_context.network_namespace_path &&
1543 s->exec_runtime &&
1544 s->exec_runtime->shared &&
1545 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1546 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1547 if (r < 0)
1548 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1549 }
1550
1551 if (s->exec_context.ipc_namespace_path &&
1552 s->exec_runtime &&
1553 s->exec_runtime->shared &&
1554 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1555 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1556 if (r < 0)
1557 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1558 }
1559
1560 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1561 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1562
1563 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1564 if (r < 0)
1565 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1566 if (r == 0) {
1567 /* Child */
1568
1569 pair[0] = safe_close(pair[0]);
1570
1571 if (exec_needs_network_namespace(&s->exec_context) &&
1572 s->exec_runtime &&
1573 s->exec_runtime->shared &&
1574 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1575
1576 if (ns_type_supported(NAMESPACE_NET)) {
1577 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1578 if (r < 0) {
1579 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1580 _exit(EXIT_NETWORK);
1581 }
1582 } else if (s->exec_context.network_namespace_path) {
1583 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1584 _exit(EXIT_NETWORK);
1585 } else
1586 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1587 }
1588
1589 fd = socket_address_listen_do(s, address, label);
1590 if (fd < 0) {
1591 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1592 _exit(EXIT_FAILURE);
1593 }
1594
1595 r = send_one_fd(pair[1], fd, 0);
1596 if (r < 0) {
1597 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1598 _exit(EXIT_FAILURE);
1599 }
1600
1601 _exit(EXIT_SUCCESS);
1602 }
1603
1604 pair[1] = safe_close(pair[1]);
1605 fd = receive_one_fd(pair[0], 0);
1606
1607 /* We synchronously wait for the helper, as it shouldn't be slow */
1608 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1609 if (r < 0) {
1610 safe_close(fd);
1611 return r;
1612 }
1613
1614 if (fd < 0)
1615 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1616
1617 return fd;
1618 }
1619
1620 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1621
1622 static int socket_open_fds(Socket *orig_s) {
1623 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1624 _cleanup_(mac_selinux_freep) char *label = NULL;
1625 bool know_label = false;
1626 int r;
1627
1628 assert(s);
1629
1630 LIST_FOREACH(port, p, s->ports) {
1631
1632 if (p->fd >= 0)
1633 continue;
1634
1635 switch (p->type) {
1636
1637 case SOCKET_SOCKET:
1638
1639 if (!know_label) {
1640 /* Figure out the label, if we don't it know yet. We do it once for the first
1641 * socket where we need this and remember it for the rest. */
1642
1643 r = socket_determine_selinux_label(s, &label);
1644 if (r < 0)
1645 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1646
1647 know_label = true;
1648 }
1649
1650 /* Apply the socket protocol */
1651 switch (p->address.type) {
1652
1653 case SOCK_STREAM:
1654 case SOCK_SEQPACKET:
1655 if (s->socket_protocol == IPPROTO_SCTP)
1656 p->address.protocol = s->socket_protocol;
1657 break;
1658
1659 case SOCK_DGRAM:
1660 if (s->socket_protocol == IPPROTO_UDPLITE)
1661 p->address.protocol = s->socket_protocol;
1662 break;
1663 }
1664
1665 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1666 if (p->fd < 0)
1667 return p->fd;
1668
1669 socket_apply_socket_options(s, p, p->fd);
1670 socket_symlink(s);
1671 break;
1672
1673 case SOCKET_SPECIAL:
1674
1675 p->fd = special_address_create(p->path, s->writable);
1676 if (p->fd < 0)
1677 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1678 break;
1679
1680 case SOCKET_FIFO:
1681
1682 p->fd = fifo_address_create(
1683 p->path,
1684 s->directory_mode,
1685 s->socket_mode);
1686 if (p->fd < 0)
1687 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1688
1689 socket_apply_fifo_options(s, p->fd);
1690 socket_symlink(s);
1691 break;
1692
1693 case SOCKET_MQUEUE:
1694
1695 p->fd = mq_address_create(
1696 p->path,
1697 s->socket_mode,
1698 s->mq_maxmsg,
1699 s->mq_msgsize);
1700 if (p->fd < 0)
1701 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1702 break;
1703
1704 case SOCKET_USB_FUNCTION: {
1705 _cleanup_free_ char *ep = NULL;
1706
1707 ep = path_make_absolute("ep0", p->path);
1708 if (!ep)
1709 return -ENOMEM;
1710
1711 p->fd = usbffs_address_create(ep);
1712 if (p->fd < 0)
1713 return p->fd;
1714
1715 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1716 if (r < 0)
1717 return r;
1718
1719 r = usbffs_dispatch_eps(p);
1720 if (r < 0)
1721 return r;
1722
1723 break;
1724 }
1725 default:
1726 assert_not_reached();
1727 }
1728 }
1729
1730 s = NULL;
1731 return 0;
1732 }
1733
1734 static void socket_unwatch_fds(Socket *s) {
1735 int r;
1736
1737 assert(s);
1738
1739 LIST_FOREACH(port, p, s->ports) {
1740 if (p->fd < 0)
1741 continue;
1742
1743 if (!p->event_source)
1744 continue;
1745
1746 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1747 if (r < 0)
1748 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1749 }
1750 }
1751
1752 static int socket_watch_fds(Socket *s) {
1753 int r;
1754
1755 assert(s);
1756
1757 LIST_FOREACH(port, p, s->ports) {
1758 if (p->fd < 0)
1759 continue;
1760
1761 if (p->event_source) {
1762 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1763 if (r < 0)
1764 goto fail;
1765 } else {
1766 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1767 if (r < 0)
1768 goto fail;
1769
1770 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1771 }
1772 }
1773
1774 return 0;
1775
1776 fail:
1777 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1778 socket_unwatch_fds(s);
1779 return r;
1780 }
1781
1782 enum {
1783 SOCKET_OPEN_NONE,
1784 SOCKET_OPEN_SOME,
1785 SOCKET_OPEN_ALL,
1786 };
1787
1788 static int socket_check_open(Socket *s) {
1789 bool have_open = false, have_closed = false;
1790
1791 assert(s);
1792
1793 LIST_FOREACH(port, p, s->ports) {
1794 if (p->fd < 0)
1795 have_closed = true;
1796 else
1797 have_open = true;
1798
1799 if (have_open && have_closed)
1800 return SOCKET_OPEN_SOME;
1801 }
1802
1803 if (have_open)
1804 return SOCKET_OPEN_ALL;
1805
1806 return SOCKET_OPEN_NONE;
1807 }
1808
1809 static void socket_set_state(Socket *s, SocketState state) {
1810 SocketState old_state;
1811 assert(s);
1812
1813 if (s->state != state)
1814 bus_unit_send_pending_change_signal(UNIT(s), false);
1815
1816 old_state = s->state;
1817 s->state = state;
1818
1819 if (!IN_SET(state,
1820 SOCKET_START_PRE,
1821 SOCKET_START_CHOWN,
1822 SOCKET_START_POST,
1823 SOCKET_STOP_PRE,
1824 SOCKET_STOP_PRE_SIGTERM,
1825 SOCKET_STOP_PRE_SIGKILL,
1826 SOCKET_STOP_POST,
1827 SOCKET_FINAL_SIGTERM,
1828 SOCKET_FINAL_SIGKILL,
1829 SOCKET_CLEANING)) {
1830
1831 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1832 socket_unwatch_control_pid(s);
1833 s->control_command = NULL;
1834 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1835 }
1836
1837 if (state != SOCKET_LISTENING)
1838 socket_unwatch_fds(s);
1839
1840 if (!IN_SET(state,
1841 SOCKET_START_CHOWN,
1842 SOCKET_START_POST,
1843 SOCKET_LISTENING,
1844 SOCKET_RUNNING,
1845 SOCKET_STOP_PRE,
1846 SOCKET_STOP_PRE_SIGTERM,
1847 SOCKET_STOP_PRE_SIGKILL,
1848 SOCKET_CLEANING))
1849 socket_close_fds(s);
1850
1851 if (state != old_state)
1852 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1853
1854 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1855 }
1856
1857 static int socket_coldplug(Unit *u) {
1858 Socket *s = SOCKET(u);
1859 int r;
1860
1861 assert(s);
1862 assert(s->state == SOCKET_DEAD);
1863
1864 if (s->deserialized_state == s->state)
1865 return 0;
1866
1867 if (s->control_pid > 0 &&
1868 pid_is_unwaited(s->control_pid) &&
1869 IN_SET(s->deserialized_state,
1870 SOCKET_START_PRE,
1871 SOCKET_START_CHOWN,
1872 SOCKET_START_POST,
1873 SOCKET_STOP_PRE,
1874 SOCKET_STOP_PRE_SIGTERM,
1875 SOCKET_STOP_PRE_SIGKILL,
1876 SOCKET_STOP_POST,
1877 SOCKET_FINAL_SIGTERM,
1878 SOCKET_FINAL_SIGKILL,
1879 SOCKET_CLEANING)) {
1880
1881 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1882 if (r < 0)
1883 return r;
1884
1885 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1886 if (r < 0)
1887 return r;
1888 }
1889
1890 if (IN_SET(s->deserialized_state,
1891 SOCKET_START_CHOWN,
1892 SOCKET_START_POST,
1893 SOCKET_LISTENING,
1894 SOCKET_RUNNING)) {
1895
1896 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1897 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1898 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1899 * and if there's a mismatch, warn loudly. */
1900
1901 r = socket_check_open(s);
1902 if (r == SOCKET_OPEN_NONE)
1903 log_unit_warning(UNIT(s),
1904 "Socket unit configuration has changed while unit has been running, "
1905 "no open socket file descriptor left. "
1906 "The socket unit is not functional until restarted.");
1907 else if (r == SOCKET_OPEN_SOME)
1908 log_unit_warning(UNIT(s),
1909 "Socket unit configuration has changed while unit has been running, "
1910 "and some socket file descriptors have not been opened yet. "
1911 "The socket unit is not fully functional until restarted.");
1912 }
1913
1914 if (s->deserialized_state == SOCKET_LISTENING) {
1915 r = socket_watch_fds(s);
1916 if (r < 0)
1917 return r;
1918 }
1919
1920 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1921 (void) unit_setup_exec_runtime(u);
1922
1923 socket_set_state(s, s->deserialized_state);
1924 return 0;
1925 }
1926
1927 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1928
1929 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1930 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1931 .stdin_fd = -EBADF,
1932 .stdout_fd = -EBADF,
1933 .stderr_fd = -EBADF,
1934 .exec_fd = -EBADF,
1935 };
1936 pid_t pid;
1937 int r;
1938
1939 assert(s);
1940 assert(c);
1941 assert(_pid);
1942
1943 r = unit_prepare_exec(UNIT(s));
1944 if (r < 0)
1945 return r;
1946
1947 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1948 if (r < 0)
1949 return r;
1950
1951 r = unit_set_exec_params(UNIT(s), &exec_params);
1952 if (r < 0)
1953 return r;
1954
1955 r = exec_spawn(UNIT(s),
1956 c,
1957 &s->exec_context,
1958 &exec_params,
1959 s->exec_runtime,
1960 &s->cgroup_context,
1961 &pid);
1962 if (r < 0)
1963 return r;
1964
1965 r = unit_watch_pid(UNIT(s), pid, true);
1966 if (r < 0)
1967 return r;
1968
1969 *_pid = pid;
1970
1971 return 0;
1972 }
1973
1974 static int socket_chown(Socket *s, pid_t *_pid) {
1975 pid_t pid;
1976 int r;
1977
1978 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1979 if (r < 0)
1980 goto fail;
1981
1982 /* We have to resolve the user names out-of-process, hence
1983 * let's fork here. It's messy, but well, what can we do? */
1984
1985 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1986 if (r < 0)
1987 return r;
1988 if (r == 0) {
1989 uid_t uid = UID_INVALID;
1990 gid_t gid = GID_INVALID;
1991
1992 /* Child */
1993
1994 if (!isempty(s->user)) {
1995 const char *user = s->user;
1996
1997 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1998 if (r < 0) {
1999 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2000 _exit(EXIT_USER);
2001 }
2002 }
2003
2004 if (!isempty(s->group)) {
2005 const char *group = s->group;
2006
2007 r = get_group_creds(&group, &gid, 0);
2008 if (r < 0) {
2009 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2010 _exit(EXIT_GROUP);
2011 }
2012 }
2013
2014 LIST_FOREACH(port, p, s->ports) {
2015 const char *path = NULL;
2016
2017 if (p->type == SOCKET_SOCKET)
2018 path = socket_address_get_path(&p->address);
2019 else if (p->type == SOCKET_FIFO)
2020 path = p->path;
2021
2022 if (!path)
2023 continue;
2024
2025 if (chown(path, uid, gid) < 0) {
2026 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2027 _exit(EXIT_CHOWN);
2028 }
2029 }
2030
2031 _exit(EXIT_SUCCESS);
2032 }
2033
2034 r = unit_watch_pid(UNIT(s), pid, true);
2035 if (r < 0)
2036 goto fail;
2037
2038 *_pid = pid;
2039 return 0;
2040
2041 fail:
2042 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2043 return r;
2044 }
2045
2046 static void socket_enter_dead(Socket *s, SocketResult f) {
2047 assert(s);
2048
2049 if (s->result == SOCKET_SUCCESS)
2050 s->result = f;
2051
2052 if (s->result == SOCKET_SUCCESS)
2053 unit_log_success(UNIT(s));
2054 else
2055 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2056
2057 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2058
2059 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2060
2061 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2062
2063 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2064
2065 unit_unref_uid_gid(UNIT(s), true);
2066 }
2067
2068 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2069
2070 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2071 int r;
2072 assert(s);
2073
2074 if (s->result == SOCKET_SUCCESS)
2075 s->result = f;
2076
2077 socket_unwatch_control_pid(s);
2078 s->control_command_id = SOCKET_EXEC_STOP_POST;
2079 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2080
2081 if (s->control_command) {
2082 r = socket_spawn(s, s->control_command, &s->control_pid);
2083 if (r < 0)
2084 goto fail;
2085
2086 socket_set_state(s, SOCKET_STOP_POST);
2087 } else
2088 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2089
2090 return;
2091
2092 fail:
2093 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2094 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2095 }
2096
2097 static int state_to_kill_operation(Socket *s, SocketState state) {
2098 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2099 return KILL_RESTART;
2100
2101 if (state == SOCKET_FINAL_SIGTERM)
2102 return KILL_TERMINATE;
2103
2104 return KILL_KILL;
2105 }
2106
2107 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2108 int r;
2109
2110 assert(s);
2111
2112 if (s->result == SOCKET_SUCCESS)
2113 s->result = f;
2114
2115 r = unit_kill_context(
2116 UNIT(s),
2117 &s->kill_context,
2118 state_to_kill_operation(s, state),
2119 -1,
2120 s->control_pid,
2121 false);
2122 if (r < 0)
2123 goto fail;
2124
2125 if (r > 0) {
2126 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2127 if (r < 0)
2128 goto fail;
2129
2130 socket_set_state(s, state);
2131 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2132 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2133 else if (state == SOCKET_STOP_PRE_SIGKILL)
2134 socket_enter_stop_post(s, SOCKET_SUCCESS);
2135 else if (state == SOCKET_FINAL_SIGTERM)
2136 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2137 else
2138 socket_enter_dead(s, SOCKET_SUCCESS);
2139
2140 return;
2141
2142 fail:
2143 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2144
2145 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2146 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2147 else
2148 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2149 }
2150
2151 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2152 int r;
2153 assert(s);
2154
2155 if (s->result == SOCKET_SUCCESS)
2156 s->result = f;
2157
2158 socket_unwatch_control_pid(s);
2159 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2160 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2161
2162 if (s->control_command) {
2163 r = socket_spawn(s, s->control_command, &s->control_pid);
2164 if (r < 0)
2165 goto fail;
2166
2167 socket_set_state(s, SOCKET_STOP_PRE);
2168 } else
2169 socket_enter_stop_post(s, SOCKET_SUCCESS);
2170
2171 return;
2172
2173 fail:
2174 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2175 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2176 }
2177
2178 static void socket_enter_listening(Socket *s) {
2179 int r;
2180 assert(s);
2181
2182 if (!s->accept && s->flush_pending) {
2183 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2184 flush_ports(s);
2185 }
2186
2187 r = socket_watch_fds(s);
2188 if (r < 0) {
2189 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2190 goto fail;
2191 }
2192
2193 socket_set_state(s, SOCKET_LISTENING);
2194 return;
2195
2196 fail:
2197 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2198 }
2199
2200 static void socket_enter_start_post(Socket *s) {
2201 int r;
2202 assert(s);
2203
2204 socket_unwatch_control_pid(s);
2205 s->control_command_id = SOCKET_EXEC_START_POST;
2206 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2207
2208 if (s->control_command) {
2209 r = socket_spawn(s, s->control_command, &s->control_pid);
2210 if (r < 0) {
2211 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2212 goto fail;
2213 }
2214
2215 socket_set_state(s, SOCKET_START_POST);
2216 } else
2217 socket_enter_listening(s);
2218
2219 return;
2220
2221 fail:
2222 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2223 }
2224
2225 static void socket_enter_start_chown(Socket *s) {
2226 int r;
2227
2228 assert(s);
2229
2230 r = socket_open_fds(s);
2231 if (r < 0) {
2232 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2233 goto fail;
2234 }
2235
2236 if (!isempty(s->user) || !isempty(s->group)) {
2237
2238 socket_unwatch_control_pid(s);
2239 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2240 s->control_command = NULL;
2241
2242 r = socket_chown(s, &s->control_pid);
2243 if (r < 0) {
2244 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2245 goto fail;
2246 }
2247
2248 socket_set_state(s, SOCKET_START_CHOWN);
2249 } else
2250 socket_enter_start_post(s);
2251
2252 return;
2253
2254 fail:
2255 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2256 }
2257
2258 static void socket_enter_start_pre(Socket *s) {
2259 int r;
2260 assert(s);
2261
2262 socket_unwatch_control_pid(s);
2263
2264 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2265
2266 s->control_command_id = SOCKET_EXEC_START_PRE;
2267 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2268
2269 if (s->control_command) {
2270 r = socket_spawn(s, s->control_command, &s->control_pid);
2271 if (r < 0) {
2272 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2273 goto fail;
2274 }
2275
2276 socket_set_state(s, SOCKET_START_PRE);
2277 } else
2278 socket_enter_start_chown(s);
2279
2280 return;
2281
2282 fail:
2283 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2284 }
2285
2286 static void flush_ports(Socket *s) {
2287 assert(s);
2288
2289 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2290 * anymore */
2291
2292 LIST_FOREACH(port, p, s->ports) {
2293 if (p->fd < 0)
2294 continue;
2295
2296 (void) flush_accept(p->fd);
2297 (void) flush_fd(p->fd);
2298 }
2299 }
2300
2301 static void socket_enter_running(Socket *s, int cfd_in) {
2302 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2303 * somewhere or close it. */
2304 _cleanup_close_ int cfd = cfd_in;
2305
2306 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2307 int r;
2308
2309 assert(s);
2310
2311 /* We don't take connections anymore if we are supposed to shut down anyway */
2312 if (unit_stop_pending(UNIT(s))) {
2313
2314 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2315
2316 if (cfd >= 0)
2317 goto refuse;
2318
2319 flush_ports(s);
2320 return;
2321 }
2322
2323 if (!ratelimit_below(&s->trigger_limit)) {
2324 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2325 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2326 goto refuse;
2327 }
2328
2329 if (cfd < 0) {
2330 bool pending = false;
2331 Unit *other;
2332
2333 /* If there's already a start pending don't bother to do anything */
2334 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2335 if (unit_active_or_pending(other)) {
2336 pending = true;
2337 break;
2338 }
2339
2340 if (!pending) {
2341 if (!UNIT_ISSET(s->service)) {
2342 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2343 "Service to activate vanished, refusing activation.");
2344 goto fail;
2345 }
2346
2347 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2348 if (r < 0)
2349 goto fail;
2350 }
2351
2352 socket_set_state(s, SOCKET_RUNNING);
2353 } else {
2354 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2355 Unit *service;
2356
2357 if (s->n_connections >= s->max_connections) {
2358 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2359 s->n_connections);
2360 goto refuse;
2361 }
2362
2363 if (s->max_connections_per_source > 0) {
2364 r = socket_acquire_peer(s, cfd, &p);
2365 if (ERRNO_IS_DISCONNECT(r))
2366 return;
2367 if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
2368 goto fail;
2369 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2370 _cleanup_free_ char *t = NULL;
2371
2372 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2373
2374 log_unit_warning(UNIT(s),
2375 "Too many incoming connections (%u) from source %s, dropping connection.",
2376 p->n_ref, strnull(t));
2377 goto refuse;
2378 }
2379 }
2380
2381 r = socket_load_service_unit(s, cfd, &service);
2382 if (ERRNO_IS_DISCONNECT(r))
2383 return;
2384 if (r < 0)
2385 goto fail;
2386
2387 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2388 false, UNIT_DEPENDENCY_IMPLICIT);
2389 if (r < 0)
2390 goto fail;
2391
2392 s->n_accepted++;
2393
2394 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2395 if (ERRNO_IS_DISCONNECT(r))
2396 return;
2397 if (r < 0)
2398 goto fail;
2399
2400 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2401 s->n_connections++;
2402
2403 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2404 if (r < 0) {
2405 /* We failed to activate the new service, but it still exists. Let's make sure the
2406 * service closes and forgets the connection fd again, immediately. */
2407 service_release_socket_fd(SERVICE(service));
2408 goto fail;
2409 }
2410
2411 /* Notify clients about changed counters */
2412 unit_add_to_dbus_queue(UNIT(s));
2413 }
2414
2415 TAKE_FD(cfd);
2416 return;
2417
2418 refuse:
2419 s->n_refused++;
2420 return;
2421
2422 fail:
2423 if (ERRNO_IS_RESOURCE(r))
2424 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2425 bus_error_message(&error, r));
2426 else
2427 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2428 cfd >= 0 ? "template" : "non-template",
2429 bus_error_message(&error, r));
2430
2431 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2432 }
2433
2434 static void socket_run_next(Socket *s) {
2435 int r;
2436
2437 assert(s);
2438 assert(s->control_command);
2439 assert(s->control_command->command_next);
2440
2441 socket_unwatch_control_pid(s);
2442
2443 s->control_command = s->control_command->command_next;
2444
2445 r = socket_spawn(s, s->control_command, &s->control_pid);
2446 if (r < 0)
2447 goto fail;
2448
2449 return;
2450
2451 fail:
2452 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2453
2454 if (s->state == SOCKET_START_POST)
2455 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2456 else if (s->state == SOCKET_STOP_POST)
2457 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2458 else
2459 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2460 }
2461
2462 static int socket_start(Unit *u) {
2463 Socket *s = SOCKET(u);
2464 int r;
2465
2466 assert(s);
2467
2468 /* We cannot fulfill this request right now, try again later
2469 * please! */
2470 if (IN_SET(s->state,
2471 SOCKET_STOP_PRE,
2472 SOCKET_STOP_PRE_SIGKILL,
2473 SOCKET_STOP_PRE_SIGTERM,
2474 SOCKET_STOP_POST,
2475 SOCKET_FINAL_SIGTERM,
2476 SOCKET_FINAL_SIGKILL,
2477 SOCKET_CLEANING))
2478 return -EAGAIN;
2479
2480 /* Already on it! */
2481 if (IN_SET(s->state,
2482 SOCKET_START_PRE,
2483 SOCKET_START_CHOWN,
2484 SOCKET_START_POST))
2485 return 0;
2486
2487 /* Cannot run this without the service being around */
2488 if (UNIT_ISSET(s->service)) {
2489 Service *service;
2490
2491 service = SERVICE(UNIT_DEREF(s->service));
2492
2493 if (UNIT(service)->load_state != UNIT_LOADED)
2494 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2495
2496 /* If the service is already active we cannot start the
2497 * socket */
2498 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED_BEFORE_AUTO_RESTART, SERVICE_AUTO_RESTART))
2499 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2500 }
2501
2502 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2503
2504 r = unit_acquire_invocation_id(u);
2505 if (r < 0)
2506 return r;
2507
2508 s->result = SOCKET_SUCCESS;
2509 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2510
2511 u->reset_accounting = true;
2512
2513 socket_enter_start_pre(s);
2514 return 1;
2515 }
2516
2517 static int socket_stop(Unit *u) {
2518 Socket *s = SOCKET(u);
2519
2520 assert(s);
2521
2522 /* Already on it */
2523 if (IN_SET(s->state,
2524 SOCKET_STOP_PRE,
2525 SOCKET_STOP_PRE_SIGTERM,
2526 SOCKET_STOP_PRE_SIGKILL,
2527 SOCKET_STOP_POST,
2528 SOCKET_FINAL_SIGTERM,
2529 SOCKET_FINAL_SIGKILL))
2530 return 0;
2531
2532 /* If there's already something running we go directly into
2533 * kill mode. */
2534 if (IN_SET(s->state,
2535 SOCKET_START_PRE,
2536 SOCKET_START_CHOWN,
2537 SOCKET_START_POST)) {
2538 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2539 return -EAGAIN;
2540 }
2541
2542 /* If we are currently cleaning, then abort it, brutally. */
2543 if (s->state == SOCKET_CLEANING) {
2544 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2545 return 0;
2546 }
2547
2548 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2549
2550 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2551 return 1;
2552 }
2553
2554 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2555 Socket *s = SOCKET(u);
2556 int r;
2557
2558 assert(u);
2559 assert(f);
2560 assert(fds);
2561
2562 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2563 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2564 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2565 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2566
2567 if (s->control_pid > 0)
2568 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2569
2570 if (s->control_command_id >= 0)
2571 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2572
2573 LIST_FOREACH(port, p, s->ports) {
2574 int copy;
2575
2576 if (p->fd < 0)
2577 continue;
2578
2579 copy = fdset_put_dup(fds, p->fd);
2580 if (copy < 0)
2581 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2582
2583 if (p->type == SOCKET_SOCKET) {
2584 _cleanup_free_ char *t = NULL;
2585
2586 r = socket_address_print(&p->address, &t);
2587 if (r < 0)
2588 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2589
2590 if (socket_address_family(&p->address) == AF_NETLINK)
2591 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2592 else
2593 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2594 } else if (p->type == SOCKET_SPECIAL)
2595 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2596 else if (p->type == SOCKET_MQUEUE)
2597 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2598 else if (p->type == SOCKET_USB_FUNCTION)
2599 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2600 else {
2601 assert(p->type == SOCKET_FIFO);
2602 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2603 }
2604 }
2605
2606 return 0;
2607 }
2608
2609 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2610 Socket *s = SOCKET(u);
2611 int r;
2612
2613 assert(u);
2614 assert(key);
2615 assert(value);
2616
2617 if (streq(key, "state")) {
2618 SocketState state;
2619
2620 state = socket_state_from_string(value);
2621 if (state < 0)
2622 log_unit_debug(u, "Failed to parse state value: %s", value);
2623 else
2624 s->deserialized_state = state;
2625 } else if (streq(key, "result")) {
2626 SocketResult f;
2627
2628 f = socket_result_from_string(value);
2629 if (f < 0)
2630 log_unit_debug(u, "Failed to parse result value: %s", value);
2631 else if (f != SOCKET_SUCCESS)
2632 s->result = f;
2633
2634 } else if (streq(key, "n-accepted")) {
2635 unsigned k;
2636
2637 if (safe_atou(value, &k) < 0)
2638 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2639 else
2640 s->n_accepted += k;
2641 } else if (streq(key, "n-refused")) {
2642 unsigned k;
2643
2644 if (safe_atou(value, &k) < 0)
2645 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2646 else
2647 s->n_refused += k;
2648 } else if (streq(key, "control-pid")) {
2649 pid_t pid;
2650
2651 if (parse_pid(value, &pid) < 0)
2652 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2653 else
2654 s->control_pid = pid;
2655 } else if (streq(key, "control-command")) {
2656 SocketExecCommand id;
2657
2658 id = socket_exec_command_from_string(value);
2659 if (id < 0)
2660 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2661 else {
2662 s->control_command_id = id;
2663 s->control_command = s->exec_command[id];
2664 }
2665 } else if (streq(key, "fifo")) {
2666 _cleanup_free_ char *fdv = NULL;
2667 bool found = false;
2668 int fd;
2669
2670 r = extract_first_word(&value, &fdv, NULL, 0);
2671 if (r <= 0) {
2672 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2673 return 0;
2674 }
2675
2676 fd = parse_fd(fdv);
2677 if (fd < 0 || !fdset_contains(fds, fd)) {
2678 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2679 return 0;
2680 }
2681
2682 LIST_FOREACH(port, p, s->ports)
2683 if (p->fd < 0 &&
2684 p->type == SOCKET_FIFO &&
2685 path_equal_or_inode_same(p->path, value, 0)) {
2686 p->fd = fdset_remove(fds, fd);
2687 found = true;
2688 break;
2689 }
2690 if (!found)
2691 log_unit_debug(u, "No matching fifo socket found: %s", value);
2692
2693 } else if (streq(key, "special")) {
2694 _cleanup_free_ char *fdv = NULL;
2695 bool found = false;
2696 int fd;
2697
2698 r = extract_first_word(&value, &fdv, NULL, 0);
2699 if (r <= 0) {
2700 log_unit_debug(u, "Failed to parse special value: %s", value);
2701 return 0;
2702 }
2703
2704 fd = parse_fd(fdv);
2705 if (fd < 0 || !fdset_contains(fds, fd)) {
2706 log_unit_debug(u, "Invalid special value: %s", fdv);
2707 return 0;
2708 }
2709
2710 LIST_FOREACH(port, p, s->ports)
2711 if (p->fd < 0 &&
2712 p->type == SOCKET_SPECIAL &&
2713 path_equal_or_inode_same(p->path, value, 0)) {
2714 p->fd = fdset_remove(fds, fd);
2715 found = true;
2716 break;
2717 }
2718 if (!found)
2719 log_unit_debug(u, "No matching special socket found: %s", value);
2720
2721 } else if (streq(key, "mqueue")) {
2722 _cleanup_free_ char *fdv = NULL;
2723 bool found = false;
2724 int fd;
2725
2726 r = extract_first_word(&value, &fdv, NULL, 0);
2727 if (r <= 0) {
2728 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2729 return 0;
2730 }
2731
2732 fd = parse_fd(fdv);
2733 if (fd < 0 || !fdset_contains(fds, fd)) {
2734 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2735 return 0;
2736 }
2737
2738 LIST_FOREACH(port, p, s->ports)
2739 if (p->fd < 0 &&
2740 p->type == SOCKET_MQUEUE &&
2741 streq(p->path, value)) {
2742 p->fd = fdset_remove(fds, fd);
2743 found = true;
2744 break;
2745 }
2746 if (!found)
2747 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2748
2749 } else if (streq(key, "socket")) {
2750 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2751 bool found = false;
2752 int fd, type;
2753
2754 r = extract_first_word(&value, &fdv, NULL, 0);
2755 if (r <= 0) {
2756 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2757 return 0;
2758 }
2759
2760 fd = parse_fd(fdv);
2761 if (fd < 0 || !fdset_contains(fds, fd)) {
2762 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2763 return 0;
2764 }
2765
2766 r = extract_first_word(&value, &typev, NULL, 0);
2767 if (r <= 0) {
2768 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2769 return 0;
2770 }
2771
2772 if (safe_atoi(typev, &type) < 0 || type < 0) {
2773 log_unit_debug(u, "Invalid socket type: %s", typev);
2774 return 0;
2775 }
2776
2777 LIST_FOREACH(port, p, s->ports)
2778 if (p->fd < 0 &&
2779 socket_address_is(&p->address, value, type)) {
2780 p->fd = fdset_remove(fds, fd);
2781 found = true;
2782 break;
2783 }
2784 if (!found)
2785 log_unit_debug(u, "No matching %s socket found: %s",
2786 socket_address_type_to_string(type), value);
2787
2788 } else if (streq(key, "netlink")) {
2789 _cleanup_free_ char *fdv = NULL;
2790 bool found = false;
2791 int fd;
2792
2793 r = extract_first_word(&value, &fdv, NULL, 0);
2794 if (r <= 0) {
2795 log_unit_debug(u, "Failed to parse socket value: %s", value);
2796 return 0;
2797 }
2798
2799 fd = parse_fd(fdv);
2800 if (fd < 0 || !fdset_contains(fds, fd)) {
2801 log_unit_debug(u, "Invalid socket value: %s", fdv);
2802 return 0;
2803 }
2804
2805 LIST_FOREACH(port, p, s->ports)
2806 if (p->fd < 0 &&
2807 socket_address_is_netlink(&p->address, value)) {
2808 p->fd = fdset_remove(fds, fd);
2809 found = true;
2810 break;
2811 }
2812 if (!found)
2813 log_unit_debug(u, "No matching netlink socket found: %s", value);
2814
2815 } else if (streq(key, "ffs")) {
2816 _cleanup_free_ char *fdv = NULL;
2817 bool found = false;
2818 int fd;
2819
2820 r = extract_first_word(&value, &fdv, NULL, 0);
2821 if (r <= 0) {
2822 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2823 return 0;
2824 }
2825
2826 fd = parse_fd(fdv);
2827 if (fd < 0 || !fdset_contains(fds, fd)) {
2828 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2829 return 0;
2830 }
2831
2832 LIST_FOREACH(port, p, s->ports)
2833 if (p->fd < 0 &&
2834 p->type == SOCKET_USB_FUNCTION &&
2835 path_equal_or_inode_same(p->path, value, 0)) {
2836 p->fd = fdset_remove(fds, fd);
2837 found = true;
2838 break;
2839 }
2840 if (!found)
2841 log_unit_debug(u, "No matching ffs socket found: %s", value);
2842
2843 } else
2844 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2845
2846 return 0;
2847 }
2848
2849 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2850 Socket *s = SOCKET(u);
2851
2852 assert(u);
2853
2854 LIST_FOREACH(port, p, s->ports) {
2855 int fd;
2856
2857 if (p->type != SOCKET_SOCKET)
2858 continue;
2859
2860 if (p->fd >= 0)
2861 continue;
2862
2863 FDSET_FOREACH(fd, fds) {
2864 if (socket_address_matches_fd(&p->address, fd)) {
2865 p->fd = fdset_remove(fds, fd);
2866 s->deserialized_state = SOCKET_LISTENING;
2867 break;
2868 }
2869 }
2870 }
2871 }
2872
2873 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2874 assert(u);
2875
2876 return state_translation_table[SOCKET(u)->state];
2877 }
2878
2879 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2880 assert(u);
2881
2882 return socket_state_to_string(SOCKET(u)->state);
2883 }
2884
2885 const char* socket_port_type_to_string(SocketPort *p) {
2886
2887 assert(p);
2888
2889 switch (p->type) {
2890
2891 case SOCKET_SOCKET:
2892
2893 switch (p->address.type) {
2894
2895 case SOCK_STREAM:
2896 return "Stream";
2897
2898 case SOCK_DGRAM:
2899 return "Datagram";
2900
2901 case SOCK_SEQPACKET:
2902 return "SequentialPacket";
2903
2904 case SOCK_RAW:
2905 if (socket_address_family(&p->address) == AF_NETLINK)
2906 return "Netlink";
2907
2908 _fallthrough_;
2909 default:
2910 return NULL;
2911 }
2912
2913 case SOCKET_SPECIAL:
2914 return "Special";
2915
2916 case SOCKET_MQUEUE:
2917 return "MessageQueue";
2918
2919 case SOCKET_FIFO:
2920 return "FIFO";
2921
2922 case SOCKET_USB_FUNCTION:
2923 return "USBFunction";
2924
2925 default:
2926 return NULL;
2927 }
2928 }
2929
2930 SocketType socket_port_type_from_string(const char *s) {
2931 assert(s);
2932
2933 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2934 return SOCKET_SOCKET;
2935 else if (streq(s, "Special"))
2936 return SOCKET_SPECIAL;
2937 else if (streq(s, "MessageQueue"))
2938 return SOCKET_MQUEUE;
2939 else if (streq(s, "FIFO"))
2940 return SOCKET_FIFO;
2941 else if (streq(s, "USBFunction"))
2942 return SOCKET_USB_FUNCTION;
2943 else
2944 return _SOCKET_TYPE_INVALID;
2945 }
2946
2947 _pure_ static bool socket_may_gc(Unit *u) {
2948 Socket *s = SOCKET(u);
2949
2950 assert(u);
2951
2952 return s->n_connections == 0;
2953 }
2954
2955 static int socket_accept_do(Socket *s, int fd) {
2956 int cfd;
2957
2958 assert(s);
2959 assert(fd >= 0);
2960
2961 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2962 if (cfd < 0)
2963 /* Convert transient network errors into clean and well-defined EAGAIN */
2964 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2965
2966 return cfd;
2967 }
2968
2969 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2970 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2971 int cfd, r;
2972 pid_t pid;
2973
2974 assert(s);
2975 assert(p);
2976 assert(fd >= 0);
2977
2978 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2979 * connection socket is also properly associated with the cgroup. */
2980
2981 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2982 goto shortcut;
2983
2984 r = bpf_firewall_supported();
2985 if (r < 0)
2986 return r;
2987 if (r == BPF_FIREWALL_UNSUPPORTED)
2988 goto shortcut;
2989
2990 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2991 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2992
2993 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2994 if (r < 0)
2995 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2996 if (r == 0) {
2997 /* Child */
2998
2999 pair[0] = safe_close(pair[0]);
3000
3001 cfd = socket_accept_do(s, fd);
3002 if (cfd == -EAGAIN) /* spurious accept() */
3003 _exit(EXIT_SUCCESS);
3004 if (cfd < 0) {
3005 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3006 _exit(EXIT_FAILURE);
3007 }
3008
3009 r = send_one_fd(pair[1], cfd, 0);
3010 if (r < 0) {
3011 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3012 _exit(EXIT_FAILURE);
3013 }
3014
3015 _exit(EXIT_SUCCESS);
3016 }
3017
3018 pair[1] = safe_close(pair[1]);
3019 cfd = receive_one_fd(pair[0], 0);
3020
3021 /* We synchronously wait for the helper, as it shouldn't be slow */
3022 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3023 if (r < 0) {
3024 safe_close(cfd);
3025 return r;
3026 }
3027
3028 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3029 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3030 if (cfd == -EIO)
3031 return -EAGAIN;
3032 if (cfd < 0)
3033 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3034
3035 return cfd;
3036
3037 shortcut:
3038 cfd = socket_accept_do(s, fd);
3039 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3040 return -EAGAIN;
3041 if (cfd < 0)
3042 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3043
3044 return cfd;
3045 }
3046
3047 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3048 SocketPort *p = ASSERT_PTR(userdata);
3049 int cfd = -EBADF;
3050
3051 assert(fd >= 0);
3052
3053 if (p->socket->state != SOCKET_LISTENING)
3054 return 0;
3055
3056 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3057
3058 if (revents != EPOLLIN) {
3059 if (revents & EPOLLHUP)
3060 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.");
3061 else
3062 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3063 goto fail;
3064 }
3065
3066 if (p->socket->accept &&
3067 p->type == SOCKET_SOCKET &&
3068 socket_address_can_accept(&p->address)) {
3069
3070 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3071 if (cfd == -EAGAIN) /* Spurious accept() */
3072 return 0;
3073 if (cfd < 0)
3074 goto fail;
3075
3076 socket_apply_socket_options(p->socket, p, cfd);
3077 }
3078
3079 socket_enter_running(p->socket, cfd);
3080 return 0;
3081
3082 fail:
3083 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3084 return 0;
3085 }
3086
3087 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3088 Socket *s = SOCKET(u);
3089 SocketResult f;
3090
3091 assert(s);
3092 assert(pid >= 0);
3093
3094 if (pid != s->control_pid)
3095 return;
3096
3097 s->control_pid = 0;
3098
3099 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3100 f = SOCKET_SUCCESS;
3101 else if (code == CLD_EXITED)
3102 f = SOCKET_FAILURE_EXIT_CODE;
3103 else if (code == CLD_KILLED)
3104 f = SOCKET_FAILURE_SIGNAL;
3105 else if (code == CLD_DUMPED)
3106 f = SOCKET_FAILURE_CORE_DUMP;
3107 else
3108 assert_not_reached();
3109
3110 if (s->control_command) {
3111 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3112
3113 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3114 f = SOCKET_SUCCESS;
3115 }
3116
3117 unit_log_process_exit(
3118 u,
3119 "Control process",
3120 socket_exec_command_to_string(s->control_command_id),
3121 f == SOCKET_SUCCESS,
3122 code, status);
3123
3124 if (s->result == SOCKET_SUCCESS)
3125 s->result = f;
3126
3127 if (s->control_command &&
3128 s->control_command->command_next &&
3129 f == SOCKET_SUCCESS) {
3130
3131 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3132 socket_run_next(s);
3133 } else {
3134 s->control_command = NULL;
3135 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3136
3137 /* No further commands for this step, so let's figure
3138 * out what to do next */
3139
3140 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3141
3142 switch (s->state) {
3143
3144 case SOCKET_START_PRE:
3145 if (f == SOCKET_SUCCESS)
3146 socket_enter_start_chown(s);
3147 else
3148 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3149 break;
3150
3151 case SOCKET_START_CHOWN:
3152 if (f == SOCKET_SUCCESS)
3153 socket_enter_start_post(s);
3154 else
3155 socket_enter_stop_pre(s, f);
3156 break;
3157
3158 case SOCKET_START_POST:
3159 if (f == SOCKET_SUCCESS)
3160 socket_enter_listening(s);
3161 else
3162 socket_enter_stop_pre(s, f);
3163 break;
3164
3165 case SOCKET_STOP_PRE:
3166 case SOCKET_STOP_PRE_SIGTERM:
3167 case SOCKET_STOP_PRE_SIGKILL:
3168 socket_enter_stop_post(s, f);
3169 break;
3170
3171 case SOCKET_STOP_POST:
3172 case SOCKET_FINAL_SIGTERM:
3173 case SOCKET_FINAL_SIGKILL:
3174 socket_enter_dead(s, f);
3175 break;
3176
3177 case SOCKET_CLEANING:
3178
3179 if (s->clean_result == SOCKET_SUCCESS)
3180 s->clean_result = f;
3181
3182 socket_enter_dead(s, SOCKET_SUCCESS);
3183 break;
3184
3185 default:
3186 assert_not_reached();
3187 }
3188 }
3189
3190 /* Notify clients about changed exit status */
3191 unit_add_to_dbus_queue(u);
3192 }
3193
3194 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3195 Socket *s = SOCKET(userdata);
3196
3197 assert(s);
3198 assert(s->timer_event_source == source);
3199
3200 switch (s->state) {
3201
3202 case SOCKET_START_PRE:
3203 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3204 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3205 break;
3206
3207 case SOCKET_START_CHOWN:
3208 case SOCKET_START_POST:
3209 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3210 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3211 break;
3212
3213 case SOCKET_STOP_PRE:
3214 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3215 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3216 break;
3217
3218 case SOCKET_STOP_PRE_SIGTERM:
3219 if (s->kill_context.send_sigkill) {
3220 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3221 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3222 } else {
3223 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3224 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3225 }
3226 break;
3227
3228 case SOCKET_STOP_PRE_SIGKILL:
3229 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3230 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3231 break;
3232
3233 case SOCKET_STOP_POST:
3234 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3235 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3236 break;
3237
3238 case SOCKET_FINAL_SIGTERM:
3239 if (s->kill_context.send_sigkill) {
3240 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3241 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3242 } else {
3243 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3244 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3245 }
3246 break;
3247
3248 case SOCKET_FINAL_SIGKILL:
3249 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3250 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3251 break;
3252
3253 case SOCKET_CLEANING:
3254 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3255
3256 if (s->clean_result == SOCKET_SUCCESS)
3257 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3258
3259 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3260 break;
3261
3262 default:
3263 assert_not_reached();
3264 }
3265
3266 return 0;
3267 }
3268
3269 int socket_collect_fds(Socket *s, int **fds) {
3270 size_t k = 0, n = 0;
3271 int *rfds;
3272
3273 assert(s);
3274 assert(fds);
3275
3276 /* Called from the service code for requesting our fds */
3277
3278 LIST_FOREACH(port, p, s->ports) {
3279 if (p->fd >= 0)
3280 n++;
3281 n += p->n_auxiliary_fds;
3282 }
3283
3284 if (n <= 0) {
3285 *fds = NULL;
3286 return 0;
3287 }
3288
3289 rfds = new(int, n);
3290 if (!rfds)
3291 return -ENOMEM;
3292
3293 LIST_FOREACH(port, p, s->ports) {
3294 if (p->fd >= 0)
3295 rfds[k++] = p->fd;
3296 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3297 rfds[k++] = p->auxiliary_fds[i];
3298 }
3299
3300 assert(k == n);
3301
3302 *fds = rfds;
3303 return (int) n;
3304 }
3305
3306 static void socket_reset_failed(Unit *u) {
3307 Socket *s = SOCKET(u);
3308
3309 assert(s);
3310
3311 if (s->state == SOCKET_FAILED)
3312 socket_set_state(s, SOCKET_DEAD);
3313
3314 s->result = SOCKET_SUCCESS;
3315 s->clean_result = SOCKET_SUCCESS;
3316 }
3317
3318 void socket_connection_unref(Socket *s) {
3319 assert(s);
3320
3321 /* The service is dead. Yay!
3322 *
3323 * This is strictly for one-instance-per-connection
3324 * services. */
3325
3326 assert(s->n_connections > 0);
3327 s->n_connections--;
3328
3329 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3330 }
3331
3332 static void socket_trigger_notify(Unit *u, Unit *other) {
3333 Socket *s = SOCKET(u);
3334
3335 assert(u);
3336 assert(other);
3337
3338 /* Filter out invocations with bogus state */
3339 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3340 assert(other->type == UNIT_SERVICE);
3341
3342 /* Don't propagate state changes from the service if we are already down */
3343 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3344 return;
3345
3346 /* We don't care for the service state if we are in Accept=yes mode */
3347 if (s->accept)
3348 return;
3349
3350 /* Propagate start limit hit state */
3351 if (other->start_limit_hit) {
3352 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3353 return;
3354 }
3355
3356 /* Don't propagate anything if there's still a job queued */
3357 if (other->job)
3358 return;
3359
3360 if (IN_SET(SERVICE(other)->state,
3361 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3362 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3363 SERVICE_AUTO_RESTART))
3364 socket_enter_listening(s);
3365
3366 if (SERVICE(other)->state == SERVICE_RUNNING)
3367 socket_set_state(s, SOCKET_RUNNING);
3368 }
3369
3370 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3371 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid, error);
3372 }
3373
3374 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3375 Socket *s = SOCKET(u);
3376 usec_t t;
3377 int r;
3378
3379 if (!s->timer_event_source)
3380 return 0;
3381
3382 r = sd_event_source_get_time(s->timer_event_source, &t);
3383 if (r < 0)
3384 return r;
3385 if (t == USEC_INFINITY)
3386 return 0;
3387
3388 *timeout = t;
3389 return 1;
3390 }
3391
3392 char *socket_fdname(Socket *s) {
3393 assert(s);
3394
3395 /* Returns the name to use for $LISTEN_NAMES. If the user
3396 * didn't specify anything specifically, use the socket unit's
3397 * name as fallback. */
3398
3399 return s->fdname ?: UNIT(s)->id;
3400 }
3401
3402 static int socket_control_pid(Unit *u) {
3403 Socket *s = SOCKET(u);
3404
3405 assert(s);
3406
3407 return s->control_pid;
3408 }
3409
3410 static int socket_clean(Unit *u, ExecCleanMask mask) {
3411 _cleanup_strv_free_ char **l = NULL;
3412 Socket *s = SOCKET(u);
3413 int r;
3414
3415 assert(s);
3416 assert(mask != 0);
3417
3418 if (s->state != SOCKET_DEAD)
3419 return -EBUSY;
3420
3421 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3422 if (r < 0)
3423 return r;
3424
3425 if (strv_isempty(l))
3426 return -EUNATCH;
3427
3428 socket_unwatch_control_pid(s);
3429 s->clean_result = SOCKET_SUCCESS;
3430 s->control_command = NULL;
3431 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3432
3433 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3434 if (r < 0)
3435 goto fail;
3436
3437 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3438 if (r < 0)
3439 goto fail;
3440
3441 socket_set_state(s, SOCKET_CLEANING);
3442
3443 return 0;
3444
3445 fail:
3446 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3447 s->clean_result = SOCKET_FAILURE_RESOURCES;
3448 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3449 return r;
3450 }
3451
3452 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3453 Socket *s = SOCKET(u);
3454
3455 assert(s);
3456
3457 return exec_context_get_clean_mask(&s->exec_context, ret);
3458 }
3459
3460 static int socket_can_start(Unit *u) {
3461 Socket *s = SOCKET(u);
3462 int r;
3463
3464 assert(s);
3465
3466 r = unit_test_start_limit(u);
3467 if (r < 0) {
3468 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3469 return r;
3470 }
3471
3472 return 1;
3473 }
3474
3475 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3476 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3477 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3478 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3479 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3480 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3481 };
3482
3483 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3484
3485 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3486 [SOCKET_SUCCESS] = "success",
3487 [SOCKET_FAILURE_RESOURCES] = "resources",
3488 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3489 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3490 [SOCKET_FAILURE_SIGNAL] = "signal",
3491 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3492 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3493 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3494 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3495 };
3496
3497 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3498
3499 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3500 [SOCKET_TIMESTAMPING_OFF] = "off",
3501 [SOCKET_TIMESTAMPING_US] = "us",
3502 [SOCKET_TIMESTAMPING_NS] = "ns",
3503 };
3504
3505 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3506
3507 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3508 SocketTimestamping t;
3509 int r;
3510
3511 if (!p)
3512 return _SOCKET_TIMESTAMPING_INVALID;
3513
3514 t = socket_timestamping_from_string(p);
3515 if (t >= 0)
3516 return t;
3517
3518 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3519 * too. */
3520 if (streq(p, "nsec"))
3521 return SOCKET_TIMESTAMPING_NS;
3522 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3523 return SOCKET_TIMESTAMPING_US;
3524
3525 r = parse_boolean(p);
3526 if (r < 0)
3527 return _SOCKET_TIMESTAMPING_INVALID;
3528
3529 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3530 }
3531
3532 const UnitVTable socket_vtable = {
3533 .object_size = sizeof(Socket),
3534 .exec_context_offset = offsetof(Socket, exec_context),
3535 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3536 .kill_context_offset = offsetof(Socket, kill_context),
3537 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3538
3539 .sections =
3540 "Unit\0"
3541 "Socket\0"
3542 "Install\0",
3543 .private_section = "Socket",
3544
3545 .can_transient = true,
3546 .can_trigger = true,
3547 .can_fail = true,
3548
3549 .init = socket_init,
3550 .done = socket_done,
3551 .load = socket_load,
3552
3553 .coldplug = socket_coldplug,
3554
3555 .dump = socket_dump,
3556
3557 .start = socket_start,
3558 .stop = socket_stop,
3559
3560 .kill = socket_kill,
3561 .clean = socket_clean,
3562 .can_clean = socket_can_clean,
3563
3564 .get_timeout = socket_get_timeout,
3565
3566 .serialize = socket_serialize,
3567 .deserialize_item = socket_deserialize_item,
3568 .distribute_fds = socket_distribute_fds,
3569
3570 .active_state = socket_active_state,
3571 .sub_state_to_string = socket_sub_state_to_string,
3572
3573 .will_restart = unit_will_restart_default,
3574
3575 .may_gc = socket_may_gc,
3576
3577 .sigchld_event = socket_sigchld_event,
3578
3579 .trigger_notify = socket_trigger_notify,
3580
3581 .reset_failed = socket_reset_failed,
3582
3583 .control_pid = socket_control_pid,
3584
3585 .bus_set_property = bus_socket_set_property,
3586 .bus_commit_properties = bus_socket_commit_properties,
3587
3588 .status_message_formats = {
3589 .finished_start_job = {
3590 [JOB_DONE] = "Listening on %s.",
3591 [JOB_FAILED] = "Failed to listen on %s.",
3592 [JOB_TIMEOUT] = "Timed out starting %s.",
3593 },
3594 .finished_stop_job = {
3595 [JOB_DONE] = "Closed %s.",
3596 [JOB_FAILED] = "Failed stopping %s.",
3597 [JOB_TIMEOUT] = "Timed out stopping %s.",
3598 },
3599 },
3600
3601 .can_start = socket_can_start,
3602 };
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