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Merge pull request #28743 from mrc0mmand/lint-python-scripts
[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 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
287 }
288
289 static bool socket_has_exec(Socket *s) {
290 unsigned i;
291 assert(s);
292
293 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
294 if (s->exec_command[i])
295 return true;
296
297 return false;
298 }
299
300 static int socket_add_extras(Socket *s) {
301 Unit *u = UNIT(s);
302 int r;
303
304 assert(s);
305
306 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
307 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
308 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
309 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
310 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
311 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
312 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
313 * service starts are typical. */
314
315 if (s->trigger_limit.interval == USEC_INFINITY)
316 s->trigger_limit.interval = 2 * USEC_PER_SEC;
317
318 if (s->trigger_limit.burst == UINT_MAX) {
319 if (s->accept)
320 s->trigger_limit.burst = 200;
321 else
322 s->trigger_limit.burst = 20;
323 }
324
325 if (have_non_accept_socket(s)) {
326
327 if (!UNIT_DEREF(s->service)) {
328 Unit *x;
329
330 r = unit_load_related_unit(u, ".service", &x);
331 if (r < 0)
332 return r;
333
334 unit_ref_set(&s->service, u, x);
335 }
336
337 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
338 if (r < 0)
339 return r;
340 }
341
342 r = socket_add_mount_dependencies(s);
343 if (r < 0)
344 return r;
345
346 r = socket_add_device_dependencies(s);
347 if (r < 0)
348 return r;
349
350 r = unit_patch_contexts(u);
351 if (r < 0)
352 return r;
353
354 if (socket_has_exec(s)) {
355 r = unit_add_exec_dependencies(u, &s->exec_context);
356 if (r < 0)
357 return r;
358 }
359
360 r = unit_set_default_slice(u);
361 if (r < 0)
362 return r;
363
364 r = socket_add_default_dependencies(s);
365 if (r < 0)
366 return r;
367
368 return 0;
369 }
370
371 static const char *socket_find_symlink_target(Socket *s) {
372 const char *found = NULL;
373
374 LIST_FOREACH(port, p, s->ports) {
375 const char *f = NULL;
376
377 switch (p->type) {
378
379 case SOCKET_FIFO:
380 f = p->path;
381 break;
382
383 case SOCKET_SOCKET:
384 f = socket_address_get_path(&p->address);
385 break;
386
387 default:
388 break;
389 }
390
391 if (f) {
392 if (found)
393 return NULL;
394
395 found = f;
396 }
397 }
398
399 return found;
400 }
401
402 static int socket_verify(Socket *s) {
403 assert(s);
404 assert(UNIT(s)->load_state == UNIT_LOADED);
405
406 if (!s->ports)
407 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
408
409 if (s->accept && have_non_accept_socket(s))
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
411
412 if (s->accept && s->max_connections <= 0)
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
414
415 if (s->accept && UNIT_DEREF(s->service))
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
417
418 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
420
421 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
422 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
423
424 return 0;
425 }
426
427 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
428 assert(s);
429
430 if (s->peer.sa.sa_family == AF_INET)
431 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
432 else if (s->peer.sa.sa_family == AF_INET6)
433 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
434 else if (s->peer.sa.sa_family == AF_VSOCK)
435 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
436 else
437 assert_not_reached();
438 }
439
440 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
441 int r;
442
443 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
444 if (r != 0)
445 return r;
446
447 switch (x->peer.sa.sa_family) {
448 case AF_INET:
449 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
450 case AF_INET6:
451 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
452 case AF_VSOCK:
453 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
454 }
455 assert_not_reached();
456 }
457
458 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
459
460 static int socket_load(Unit *u) {
461 Socket *s = SOCKET(u);
462 int r;
463
464 assert(u);
465 assert(u->load_state == UNIT_STUB);
466
467 r = unit_load_fragment_and_dropin(u, true);
468 if (r < 0)
469 return r;
470
471 if (u->load_state != UNIT_LOADED)
472 return 0;
473
474 /* This is a new unit? Then let's add in some extras */
475 r = socket_add_extras(s);
476 if (r < 0)
477 return r;
478
479 return socket_verify(s);
480 }
481
482 static SocketPeer *socket_peer_new(void) {
483 SocketPeer *p;
484
485 p = new(SocketPeer, 1);
486 if (!p)
487 return NULL;
488
489 *p = (SocketPeer) {
490 .n_ref = 1,
491 };
492 return p;
493 }
494
495 static SocketPeer *socket_peer_free(SocketPeer *p) {
496 assert(p);
497
498 if (p->socket)
499 set_remove(p->socket->peers_by_address, p);
500
501 return mfree(p);
502 }
503
504 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
505
506 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
507 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
508 SocketPeer sa = {
509 .peer_salen = sizeof(union sockaddr_union),
510 }, *i;
511 int r;
512
513 assert(fd >= 0);
514 assert(s);
515
516 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
517 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
518
519 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
520 *p = NULL;
521 return 0;
522 }
523
524 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
525 if (r < 0)
526 return r;
527
528 i = set_get(s->peers_by_address, &sa);
529 if (i) {
530 *p = socket_peer_ref(i);
531 return 1;
532 }
533
534 remote = socket_peer_new();
535 if (!remote)
536 return log_oom();
537
538 remote->peer = sa.peer;
539 remote->peer_salen = sa.peer_salen;
540
541 r = set_put(s->peers_by_address, remote);
542 if (r < 0)
543 return r;
544
545 remote->socket = s;
546
547 *p = TAKE_PTR(remote);
548 return 1;
549 }
550
551 static const char* listen_lookup(int family, int type) {
552
553 if (family == AF_NETLINK)
554 return "ListenNetlink";
555
556 if (type == SOCK_STREAM)
557 return "ListenStream";
558 else if (type == SOCK_DGRAM)
559 return "ListenDatagram";
560 else if (type == SOCK_SEQPACKET)
561 return "ListenSequentialPacket";
562
563 assert_not_reached();
564 return NULL;
565 }
566
567 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
568 Socket *s = SOCKET(u);
569 const char *prefix2, *str;
570
571 assert(s);
572 assert(f);
573
574 prefix = strempty(prefix);
575 prefix2 = strjoina(prefix, "\t");
576
577 fprintf(f,
578 "%sSocket State: %s\n"
579 "%sResult: %s\n"
580 "%sClean Result: %s\n"
581 "%sBindIPv6Only: %s\n"
582 "%sBacklog: %u\n"
583 "%sSocketMode: %04o\n"
584 "%sDirectoryMode: %04o\n"
585 "%sKeepAlive: %s\n"
586 "%sNoDelay: %s\n"
587 "%sFreeBind: %s\n"
588 "%sTransparent: %s\n"
589 "%sBroadcast: %s\n"
590 "%sPassCredentials: %s\n"
591 "%sPassSecurity: %s\n"
592 "%sPassPacketInfo: %s\n"
593 "%sTCPCongestion: %s\n"
594 "%sRemoveOnStop: %s\n"
595 "%sWritable: %s\n"
596 "%sFileDescriptorName: %s\n"
597 "%sSELinuxContextFromNet: %s\n",
598 prefix, socket_state_to_string(s->state),
599 prefix, socket_result_to_string(s->result),
600 prefix, socket_result_to_string(s->clean_result),
601 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
602 prefix, s->backlog,
603 prefix, s->socket_mode,
604 prefix, s->directory_mode,
605 prefix, yes_no(s->keep_alive),
606 prefix, yes_no(s->no_delay),
607 prefix, yes_no(s->free_bind),
608 prefix, yes_no(s->transparent),
609 prefix, yes_no(s->broadcast),
610 prefix, yes_no(s->pass_cred),
611 prefix, yes_no(s->pass_sec),
612 prefix, yes_no(s->pass_pktinfo),
613 prefix, strna(s->tcp_congestion),
614 prefix, yes_no(s->remove_on_stop),
615 prefix, yes_no(s->writable),
616 prefix, socket_fdname(s),
617 prefix, yes_no(s->selinux_context_from_net));
618
619 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
620 fprintf(f,
621 "%sTimestamping: %s\n",
622 prefix, socket_timestamping_to_string(s->timestamping));
623
624 if (s->control_pid > 0)
625 fprintf(f,
626 "%sControl PID: "PID_FMT"\n",
627 prefix, s->control_pid);
628
629 if (s->bind_to_device)
630 fprintf(f,
631 "%sBindToDevice: %s\n",
632 prefix, s->bind_to_device);
633
634 if (s->accept)
635 fprintf(f,
636 "%sAccepted: %u\n"
637 "%sNConnections: %u\n"
638 "%sMaxConnections: %u\n"
639 "%sMaxConnectionsPerSource: %u\n",
640 prefix, s->n_accepted,
641 prefix, s->n_connections,
642 prefix, s->max_connections,
643 prefix, s->max_connections_per_source);
644 else
645 fprintf(f,
646 "%sFlushPending: %s\n",
647 prefix, yes_no(s->flush_pending));
648
649
650 if (s->priority >= 0)
651 fprintf(f,
652 "%sPriority: %i\n",
653 prefix, s->priority);
654
655 if (s->receive_buffer > 0)
656 fprintf(f,
657 "%sReceiveBuffer: %zu\n",
658 prefix, s->receive_buffer);
659
660 if (s->send_buffer > 0)
661 fprintf(f,
662 "%sSendBuffer: %zu\n",
663 prefix, s->send_buffer);
664
665 if (s->ip_tos >= 0)
666 fprintf(f,
667 "%sIPTOS: %i\n",
668 prefix, s->ip_tos);
669
670 if (s->ip_ttl >= 0)
671 fprintf(f,
672 "%sIPTTL: %i\n",
673 prefix, s->ip_ttl);
674
675 if (s->pipe_size > 0)
676 fprintf(f,
677 "%sPipeSize: %zu\n",
678 prefix, s->pipe_size);
679
680 if (s->mark >= 0)
681 fprintf(f,
682 "%sMark: %i\n",
683 prefix, s->mark);
684
685 if (s->mq_maxmsg > 0)
686 fprintf(f,
687 "%sMessageQueueMaxMessages: %li\n",
688 prefix, s->mq_maxmsg);
689
690 if (s->mq_msgsize > 0)
691 fprintf(f,
692 "%sMessageQueueMessageSize: %li\n",
693 prefix, s->mq_msgsize);
694
695 if (s->reuse_port)
696 fprintf(f,
697 "%sReusePort: %s\n",
698 prefix, yes_no(s->reuse_port));
699
700 if (s->smack)
701 fprintf(f,
702 "%sSmackLabel: %s\n",
703 prefix, s->smack);
704
705 if (s->smack_ip_in)
706 fprintf(f,
707 "%sSmackLabelIPIn: %s\n",
708 prefix, s->smack_ip_in);
709
710 if (s->smack_ip_out)
711 fprintf(f,
712 "%sSmackLabelIPOut: %s\n",
713 prefix, s->smack_ip_out);
714
715 if (!isempty(s->user) || !isempty(s->group))
716 fprintf(f,
717 "%sSocketUser: %s\n"
718 "%sSocketGroup: %s\n",
719 prefix, strna(s->user),
720 prefix, strna(s->group));
721
722 if (timestamp_is_set(s->keep_alive_time))
723 fprintf(f,
724 "%sKeepAliveTimeSec: %s\n",
725 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
726
727 if (s->keep_alive_interval > 0)
728 fprintf(f,
729 "%sKeepAliveIntervalSec: %s\n",
730 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
731
732 if (s->keep_alive_cnt > 0)
733 fprintf(f,
734 "%sKeepAliveProbes: %u\n",
735 prefix, s->keep_alive_cnt);
736
737 if (s->defer_accept > 0)
738 fprintf(f,
739 "%sDeferAcceptSec: %s\n",
740 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
741
742 LIST_FOREACH(port, p, s->ports) {
743
744 switch (p->type) {
745 case SOCKET_SOCKET: {
746 _cleanup_free_ char *k = NULL;
747 int r;
748
749 r = socket_address_print(&p->address, &k);
750 if (r < 0) {
751 errno = -r;
752 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
753 } else
754 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
755 break;
756 }
757 case SOCKET_SPECIAL:
758 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
759 break;
760 case SOCKET_USB_FUNCTION:
761 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
762 break;
763 case SOCKET_MQUEUE:
764 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
765 break;
766 default:
767 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
768 }
769 }
770
771 fprintf(f,
772 "%sTriggerLimitIntervalSec: %s\n"
773 "%sTriggerLimitBurst: %u\n",
774 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
775 prefix, s->trigger_limit.burst);
776
777 str = ip_protocol_to_name(s->socket_protocol);
778 if (str)
779 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
780
781 if (!strv_isempty(s->symlinks)) {
782 fprintf(f, "%sSymlinks:", prefix);
783 STRV_FOREACH(q, s->symlinks)
784 fprintf(f, " %s", *q);
785
786 fprintf(f, "\n");
787 }
788
789 fprintf(f,
790 "%sTimeoutSec: %s\n",
791 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
792
793 exec_context_dump(&s->exec_context, f, prefix);
794 kill_context_dump(&s->kill_context, f, prefix);
795
796 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
797 if (!s->exec_command[c])
798 continue;
799
800 fprintf(f, "%s-> %s:\n",
801 prefix, socket_exec_command_to_string(c));
802
803 exec_command_dump_list(s->exec_command[c], f, prefix2);
804 }
805
806 cgroup_context_dump(UNIT(s), f, prefix);
807 }
808
809 static int instance_from_socket(int fd, unsigned nr, char **instance) {
810 socklen_t l;
811 char *r;
812 union sockaddr_union local, remote;
813
814 assert(fd >= 0);
815 assert(instance);
816
817 l = sizeof(local);
818 if (getsockname(fd, &local.sa, &l) < 0)
819 return -errno;
820
821 l = sizeof(remote);
822 if (getpeername(fd, &remote.sa, &l) < 0)
823 return -errno;
824
825 switch (local.sa.sa_family) {
826
827 case AF_INET: {
828 uint32_t
829 a = be32toh(local.in.sin_addr.s_addr),
830 b = be32toh(remote.in.sin_addr.s_addr);
831
832 if (asprintf(&r,
833 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
834 nr,
835 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
836 be16toh(local.in.sin_port),
837 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
838 be16toh(remote.in.sin_port)) < 0)
839 return -ENOMEM;
840
841 break;
842 }
843
844 case AF_INET6: {
845 static const unsigned char ipv4_prefix[] = {
846 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
847 };
848
849 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
850 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
851 const uint8_t
852 *a = local.in6.sin6_addr.s6_addr+12,
853 *b = remote.in6.sin6_addr.s6_addr+12;
854
855 if (asprintf(&r,
856 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
857 nr,
858 a[0], a[1], a[2], a[3],
859 be16toh(local.in6.sin6_port),
860 b[0], b[1], b[2], b[3],
861 be16toh(remote.in6.sin6_port)) < 0)
862 return -ENOMEM;
863 } else {
864 if (asprintf(&r,
865 "%u-%s:%u-%s:%u",
866 nr,
867 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
868 be16toh(local.in6.sin6_port),
869 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
870 be16toh(remote.in6.sin6_port)) < 0)
871 return -ENOMEM;
872 }
873
874 break;
875 }
876
877 case AF_UNIX: {
878 struct ucred ucred;
879 int k;
880
881 k = getpeercred(fd, &ucred);
882 if (k >= 0) {
883 if (asprintf(&r,
884 "%u-"PID_FMT"-"UID_FMT,
885 nr, ucred.pid, ucred.uid) < 0)
886 return -ENOMEM;
887 } else if (k == -ENODATA) {
888 /* This handles the case where somebody is
889 * connecting from another pid/uid namespace
890 * (e.g. from outside of our container). */
891 if (asprintf(&r,
892 "%u-unknown",
893 nr) < 0)
894 return -ENOMEM;
895 } else
896 return k;
897
898 break;
899 }
900
901 case AF_VSOCK:
902 if (asprintf(&r,
903 "%u-%u:%u-%u:%u",
904 nr,
905 local.vm.svm_cid, local.vm.svm_port,
906 remote.vm.svm_cid, remote.vm.svm_port) < 0)
907 return -ENOMEM;
908
909 break;
910
911 default:
912 assert_not_reached();
913 }
914
915 *instance = r;
916 return 0;
917 }
918
919 static void socket_close_fds(Socket *s) {
920 assert(s);
921
922 LIST_FOREACH(port, p, s->ports) {
923 bool was_open;
924
925 was_open = p->fd >= 0;
926
927 p->event_source = sd_event_source_disable_unref(p->event_source);
928 p->fd = safe_close(p->fd);
929 socket_cleanup_fd_list(p);
930
931 /* One little note: we should normally not delete any sockets in the file system here! After all some
932 * other process we spawned might still have a reference of this fd and wants to continue to use
933 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
934 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
935 * anyway, but only then. */
936
937 if (!was_open || !s->remove_on_stop)
938 continue;
939
940 switch (p->type) {
941
942 case SOCKET_FIFO:
943 (void) unlink(p->path);
944 break;
945
946 case SOCKET_MQUEUE:
947 (void) mq_unlink(p->path);
948 break;
949
950 case SOCKET_SOCKET:
951 (void) socket_address_unlink(&p->address);
952 break;
953
954 default:
955 break;
956 }
957 }
958
959 if (s->remove_on_stop)
960 STRV_FOREACH(i, s->symlinks)
961 (void) unlink(*i);
962
963 /* Note that we don't return NULL here, since s has not been freed. */
964 }
965
966 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
967 int r;
968
969 assert(s);
970 assert(p);
971 assert(fd >= 0);
972
973 if (s->keep_alive) {
974 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
975 if (r < 0)
976 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
977 }
978
979 if (timestamp_is_set(s->keep_alive_time)) {
980 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
981 if (r < 0)
982 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
983 }
984
985 if (s->keep_alive_interval > 0) {
986 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
987 if (r < 0)
988 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
989 }
990
991 if (s->keep_alive_cnt > 0) {
992 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
993 if (r < 0)
994 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
995 }
996
997 if (s->defer_accept > 0) {
998 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
999 if (r < 0)
1000 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1001 }
1002
1003 if (s->no_delay) {
1004 if (s->socket_protocol == IPPROTO_SCTP) {
1005 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1006 if (r < 0)
1007 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1008 } else {
1009 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1010 if (r < 0)
1011 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1012 }
1013 }
1014
1015 if (s->broadcast) {
1016 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1017 if (r < 0)
1018 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1019 }
1020
1021 if (s->pass_cred) {
1022 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1023 if (r < 0)
1024 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1025 }
1026
1027 if (s->pass_sec) {
1028 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1029 if (r < 0)
1030 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1031 }
1032
1033 if (s->pass_pktinfo) {
1034 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1035 if (r < 0)
1036 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1037 }
1038
1039 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1040 r = setsockopt_int(fd, SOL_SOCKET,
1041 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1042 true);
1043 if (r < 0)
1044 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1045 }
1046
1047 if (s->priority >= 0) {
1048 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1049 if (r < 0)
1050 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1051 }
1052
1053 if (s->receive_buffer > 0) {
1054 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1055 if (r < 0)
1056 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1057 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1058 }
1059
1060 if (s->send_buffer > 0) {
1061 r = fd_set_sndbuf(fd, s->send_buffer, false);
1062 if (r < 0)
1063 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1064 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1065 }
1066
1067 if (s->mark >= 0) {
1068 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1069 if (r < 0)
1070 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1071 }
1072
1073 if (s->ip_tos >= 0) {
1074 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1075 if (r < 0)
1076 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1077 }
1078
1079 if (s->ip_ttl >= 0) {
1080 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1081 if (r < 0)
1082 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1083 }
1084
1085 if (s->tcp_congestion)
1086 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1087 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1088
1089 if (s->smack_ip_in) {
1090 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1091 if (r < 0)
1092 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1093 }
1094
1095 if (s->smack_ip_out) {
1096 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1097 if (r < 0)
1098 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1099 }
1100 }
1101
1102 static void socket_apply_fifo_options(Socket *s, int fd) {
1103 int r;
1104
1105 assert(s);
1106 assert(fd >= 0);
1107
1108 if (s->pipe_size > 0)
1109 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1110 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1111
1112 if (s->smack) {
1113 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1114 if (r < 0)
1115 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1116 }
1117 }
1118
1119 static int fifo_address_create(
1120 const char *path,
1121 mode_t directory_mode,
1122 mode_t socket_mode) {
1123
1124 _cleanup_close_ int fd = -EBADF;
1125 mode_t old_mask;
1126 struct stat st;
1127 int r;
1128
1129 assert(path);
1130
1131 (void) mkdir_parents_label(path, directory_mode);
1132
1133 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1134 if (r < 0)
1135 return r;
1136
1137 /* Enforce the right access mode for the fifo */
1138 old_mask = umask(~socket_mode);
1139
1140 /* Include the original umask in our mask */
1141 (void) umask(~socket_mode | old_mask);
1142
1143 r = mkfifo(path, socket_mode);
1144 (void) umask(old_mask);
1145
1146 if (r < 0 && errno != EEXIST) {
1147 r = -errno;
1148 goto fail;
1149 }
1150
1151 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1152 if (fd < 0) {
1153 r = -errno;
1154 goto fail;
1155 }
1156
1157 mac_selinux_create_file_clear();
1158
1159 if (fstat(fd, &st) < 0) {
1160 r = -errno;
1161 goto fail;
1162 }
1163
1164 if (!S_ISFIFO(st.st_mode) ||
1165 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1166 st.st_uid != getuid() ||
1167 st.st_gid != getgid()) {
1168 r = -EEXIST;
1169 goto fail;
1170 }
1171
1172 return TAKE_FD(fd);
1173
1174 fail:
1175 mac_selinux_create_file_clear();
1176 return r;
1177 }
1178
1179 static int special_address_create(const char *path, bool writable) {
1180 _cleanup_close_ int fd = -EBADF;
1181 struct stat st;
1182
1183 assert(path);
1184
1185 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1186 if (fd < 0)
1187 return -errno;
1188
1189 if (fstat(fd, &st) < 0)
1190 return -errno;
1191
1192 /* Check whether this is a /proc, /sys or /dev file or char device */
1193 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1194 return -EEXIST;
1195
1196 return TAKE_FD(fd);
1197 }
1198
1199 static int usbffs_address_create(const char *path) {
1200 _cleanup_close_ int fd = -EBADF;
1201 struct stat st;
1202
1203 assert(path);
1204
1205 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1206 if (fd < 0)
1207 return -errno;
1208
1209 if (fstat(fd, &st) < 0)
1210 return -errno;
1211
1212 /* Check whether this is a regular file (ffs endpoint) */
1213 if (!S_ISREG(st.st_mode))
1214 return -EEXIST;
1215
1216 return TAKE_FD(fd);
1217 }
1218
1219 static int mq_address_create(
1220 const char *path,
1221 mode_t mq_mode,
1222 long maxmsg,
1223 long msgsize) {
1224
1225 _cleanup_close_ int fd = -EBADF;
1226 struct stat st;
1227 mode_t old_mask;
1228 struct mq_attr _attr, *attr = NULL;
1229
1230 assert(path);
1231
1232 if (maxmsg > 0 && msgsize > 0) {
1233 _attr = (struct mq_attr) {
1234 .mq_flags = O_NONBLOCK,
1235 .mq_maxmsg = maxmsg,
1236 .mq_msgsize = msgsize,
1237 };
1238 attr = &_attr;
1239 }
1240
1241 /* Enforce the right access mode for the mq */
1242 old_mask = umask(~mq_mode);
1243
1244 /* Include the original umask in our mask */
1245 (void) umask(~mq_mode | old_mask);
1246 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1247 (void) umask(old_mask);
1248
1249 if (fd < 0)
1250 return -errno;
1251
1252 if (fstat(fd, &st) < 0)
1253 return -errno;
1254
1255 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1256 st.st_uid != getuid() ||
1257 st.st_gid != getgid())
1258 return -EEXIST;
1259
1260 return TAKE_FD(fd);
1261 }
1262
1263 static int socket_symlink(Socket *s) {
1264 const char *p;
1265 int r;
1266
1267 assert(s);
1268
1269 p = socket_find_symlink_target(s);
1270 if (!p)
1271 return 0;
1272
1273 STRV_FOREACH(i, s->symlinks) {
1274 (void) mkdir_parents_label(*i, s->directory_mode);
1275
1276 r = symlink_idempotent(p, *i, false);
1277
1278 if (r == -EEXIST && s->remove_on_stop) {
1279 /* If there's already something where we want to create the symlink, and the destructive
1280 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1281 * again. */
1282
1283 if (unlink(*i) >= 0)
1284 r = symlink_idempotent(p, *i, false);
1285 }
1286
1287 if (r < 0)
1288 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1289 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1290 }
1291
1292 return 0;
1293 }
1294
1295 static int usbffs_write_descs(int fd, Service *s) {
1296 int r;
1297
1298 if (!s->usb_function_descriptors || !s->usb_function_strings)
1299 return -EINVAL;
1300
1301 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1302 if (r < 0)
1303 return r;
1304
1305 return copy_file_fd(s->usb_function_strings, fd, 0);
1306 }
1307
1308 static int usbffs_select_ep(const struct dirent *d) {
1309 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1310 }
1311
1312 static int usbffs_dispatch_eps(SocketPort *p) {
1313 _cleanup_free_ struct dirent **ent = NULL;
1314 size_t n, k;
1315 int r;
1316
1317 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1318 if (r < 0)
1319 return -errno;
1320
1321 n = (size_t) r;
1322 p->auxiliary_fds = new(int, n);
1323 if (!p->auxiliary_fds) {
1324 r = -ENOMEM;
1325 goto clear;
1326 }
1327
1328 p->n_auxiliary_fds = n;
1329
1330 k = 0;
1331 for (size_t i = 0; i < n; ++i) {
1332 _cleanup_free_ char *ep = NULL;
1333
1334 ep = path_make_absolute(ent[i]->d_name, p->path);
1335 if (!ep) {
1336 r = -ENOMEM;
1337 goto fail;
1338 }
1339
1340 path_simplify(ep);
1341
1342 r = usbffs_address_create(ep);
1343 if (r < 0)
1344 goto fail;
1345
1346 p->auxiliary_fds[k++] = r;
1347 }
1348
1349 r = 0;
1350 goto clear;
1351
1352 fail:
1353 close_many(p->auxiliary_fds, k);
1354 p->auxiliary_fds = mfree(p->auxiliary_fds);
1355 p->n_auxiliary_fds = 0;
1356
1357 clear:
1358 for (size_t i = 0; i < n; ++i)
1359 free(ent[i]);
1360
1361 return r;
1362 }
1363
1364 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1365 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1366 *
1367 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1368 * instance name.
1369 */
1370
1371 if (UNIT_ISSET(s->service)) {
1372 *ret = UNIT_DEREF(s->service);
1373 return 0;
1374 }
1375
1376 if (!s->accept)
1377 return -ENODATA;
1378
1379 /* Build the instance name and load the unit */
1380 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1381 int r;
1382
1383 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1384 if (r < 0)
1385 return r;
1386
1387 if (cfd >= 0) {
1388 r = instance_from_socket(cfd, s->n_accepted, &instance);
1389 if (r < 0) {
1390 if (ERRNO_IS_DISCONNECT(r))
1391 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1392 * different errors. This connection is over, but the socket unit lives on. */
1393 return log_unit_debug_errno(UNIT(s), r,
1394 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1395 errno_to_name(r));
1396 return r;
1397 }
1398 }
1399
1400 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1401 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1402 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1403 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1404 if (r < 0)
1405 return r;
1406
1407 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1408 }
1409
1410 static int socket_determine_selinux_label(Socket *s, char **ret) {
1411 int r;
1412
1413 assert(s);
1414 assert(ret);
1415
1416 Unit *service;
1417 ExecCommand *c;
1418 const char *exec_context;
1419 _cleanup_free_ char *path = NULL;
1420
1421 r = socket_load_service_unit(s, -1, &service);
1422 if (r == -ENODATA)
1423 goto no_label;
1424 if (r < 0)
1425 return r;
1426
1427 exec_context = SERVICE(service)->exec_context.selinux_context;
1428 if (exec_context) {
1429 char *con;
1430
1431 con = strdup(exec_context);
1432 if (!con)
1433 return -ENOMEM;
1434
1435 *ret = TAKE_PTR(con);
1436 return 0;
1437 }
1438
1439 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1440 if (!c)
1441 goto no_label;
1442
1443 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1444 if (r < 0)
1445 goto no_label;
1446
1447 r = mac_selinux_get_create_label_from_exe(path, ret);
1448 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1449 goto no_label;
1450 return r;
1451
1452 no_label:
1453 *ret = NULL;
1454 return 0;
1455 }
1456
1457 static int socket_address_listen_do(
1458 Socket *s,
1459 const SocketAddress *address,
1460 const char *label) {
1461
1462 assert(s);
1463 assert(address);
1464
1465 return socket_address_listen(
1466 address,
1467 SOCK_CLOEXEC|SOCK_NONBLOCK,
1468 s->backlog,
1469 s->bind_ipv6_only,
1470 s->bind_to_device,
1471 s->reuse_port,
1472 s->free_bind,
1473 s->transparent,
1474 s->directory_mode,
1475 s->socket_mode,
1476 label);
1477 }
1478
1479 #define log_address_error_errno(u, address, error, fmt) \
1480 ({ \
1481 _cleanup_free_ char *_t = NULL; \
1482 \
1483 (void) socket_address_print(address, &_t); \
1484 log_unit_error_errno(u, error, fmt, strna(_t)); \
1485 })
1486
1487 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1488 int r;
1489
1490 assert(address);
1491 assert(context);
1492
1493 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1494
1495 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1496 r = bpf_firewall_supported();
1497 if (r < 0)
1498 return r;
1499 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1500 return true;
1501 }
1502
1503 return exec_needs_network_namespace(context);
1504 }
1505
1506 static int socket_address_listen_in_cgroup(
1507 Socket *s,
1508 const SocketAddress *address,
1509 const char *label) {
1510
1511 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1512 int fd, r;
1513 pid_t pid;
1514
1515 assert(s);
1516 assert(address);
1517
1518 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1519 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1520 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1521 * such. */
1522
1523 r = fork_needed(address, &s->exec_context);
1524 if (r < 0)
1525 return r;
1526 if (r == 0) {
1527 /* Shortcut things... */
1528 fd = socket_address_listen_do(s, address, label);
1529 if (fd < 0)
1530 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1531
1532 return fd;
1533 }
1534
1535 r = unit_setup_exec_runtime(UNIT(s));
1536 if (r < 0)
1537 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1538
1539 if (s->exec_context.network_namespace_path &&
1540 s->exec_runtime &&
1541 s->exec_runtime->shared &&
1542 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1543 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1544 if (r < 0)
1545 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1546 }
1547
1548 if (s->exec_context.ipc_namespace_path &&
1549 s->exec_runtime &&
1550 s->exec_runtime->shared &&
1551 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1552 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1553 if (r < 0)
1554 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1555 }
1556
1557 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1558 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1559
1560 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1561 if (r < 0)
1562 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1563 if (r == 0) {
1564 /* Child */
1565
1566 pair[0] = safe_close(pair[0]);
1567
1568 if (exec_needs_network_namespace(&s->exec_context) &&
1569 s->exec_runtime &&
1570 s->exec_runtime->shared &&
1571 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1572
1573 if (ns_type_supported(NAMESPACE_NET)) {
1574 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1575 if (r < 0) {
1576 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1577 _exit(EXIT_NETWORK);
1578 }
1579 } else if (s->exec_context.network_namespace_path) {
1580 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1581 _exit(EXIT_NETWORK);
1582 } else
1583 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1584 }
1585
1586 fd = socket_address_listen_do(s, address, label);
1587 if (fd < 0) {
1588 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1589 _exit(EXIT_FAILURE);
1590 }
1591
1592 r = send_one_fd(pair[1], fd, 0);
1593 if (r < 0) {
1594 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1595 _exit(EXIT_FAILURE);
1596 }
1597
1598 _exit(EXIT_SUCCESS);
1599 }
1600
1601 pair[1] = safe_close(pair[1]);
1602 fd = receive_one_fd(pair[0], 0);
1603
1604 /* We synchronously wait for the helper, as it shouldn't be slow */
1605 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1606 if (r < 0) {
1607 safe_close(fd);
1608 return r;
1609 }
1610
1611 if (fd < 0)
1612 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1613
1614 return fd;
1615 }
1616
1617 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1618
1619 static int socket_open_fds(Socket *orig_s) {
1620 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1621 _cleanup_(mac_selinux_freep) char *label = NULL;
1622 bool know_label = false;
1623 int r;
1624
1625 assert(s);
1626
1627 LIST_FOREACH(port, p, s->ports) {
1628
1629 if (p->fd >= 0)
1630 continue;
1631
1632 switch (p->type) {
1633
1634 case SOCKET_SOCKET:
1635
1636 if (!know_label) {
1637 /* Figure out the label, if we don't it know yet. We do it once for the first
1638 * socket where we need this and remember it for the rest. */
1639
1640 r = socket_determine_selinux_label(s, &label);
1641 if (r < 0)
1642 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1643
1644 know_label = true;
1645 }
1646
1647 /* Apply the socket protocol */
1648 switch (p->address.type) {
1649
1650 case SOCK_STREAM:
1651 case SOCK_SEQPACKET:
1652 if (s->socket_protocol == IPPROTO_SCTP)
1653 p->address.protocol = s->socket_protocol;
1654 break;
1655
1656 case SOCK_DGRAM:
1657 if (s->socket_protocol == IPPROTO_UDPLITE)
1658 p->address.protocol = s->socket_protocol;
1659 break;
1660 }
1661
1662 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1663 if (p->fd < 0)
1664 return p->fd;
1665
1666 socket_apply_socket_options(s, p, p->fd);
1667 socket_symlink(s);
1668 break;
1669
1670 case SOCKET_SPECIAL:
1671
1672 p->fd = special_address_create(p->path, s->writable);
1673 if (p->fd < 0)
1674 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1675 break;
1676
1677 case SOCKET_FIFO:
1678
1679 p->fd = fifo_address_create(
1680 p->path,
1681 s->directory_mode,
1682 s->socket_mode);
1683 if (p->fd < 0)
1684 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1685
1686 socket_apply_fifo_options(s, p->fd);
1687 socket_symlink(s);
1688 break;
1689
1690 case SOCKET_MQUEUE:
1691
1692 p->fd = mq_address_create(
1693 p->path,
1694 s->socket_mode,
1695 s->mq_maxmsg,
1696 s->mq_msgsize);
1697 if (p->fd < 0)
1698 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1699 break;
1700
1701 case SOCKET_USB_FUNCTION: {
1702 _cleanup_free_ char *ep = NULL;
1703
1704 ep = path_make_absolute("ep0", p->path);
1705 if (!ep)
1706 return -ENOMEM;
1707
1708 p->fd = usbffs_address_create(ep);
1709 if (p->fd < 0)
1710 return p->fd;
1711
1712 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1713 if (r < 0)
1714 return r;
1715
1716 r = usbffs_dispatch_eps(p);
1717 if (r < 0)
1718 return r;
1719
1720 break;
1721 }
1722 default:
1723 assert_not_reached();
1724 }
1725 }
1726
1727 s = NULL;
1728 return 0;
1729 }
1730
1731 static void socket_unwatch_fds(Socket *s) {
1732 int r;
1733
1734 assert(s);
1735
1736 LIST_FOREACH(port, p, s->ports) {
1737 if (p->fd < 0)
1738 continue;
1739
1740 if (!p->event_source)
1741 continue;
1742
1743 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1744 if (r < 0)
1745 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1746 }
1747 }
1748
1749 static int socket_watch_fds(Socket *s) {
1750 int r;
1751
1752 assert(s);
1753
1754 LIST_FOREACH(port, p, s->ports) {
1755 if (p->fd < 0)
1756 continue;
1757
1758 if (p->event_source) {
1759 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1760 if (r < 0)
1761 goto fail;
1762 } else {
1763 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1764 if (r < 0)
1765 goto fail;
1766
1767 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1768 }
1769 }
1770
1771 return 0;
1772
1773 fail:
1774 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1775 socket_unwatch_fds(s);
1776 return r;
1777 }
1778
1779 enum {
1780 SOCKET_OPEN_NONE,
1781 SOCKET_OPEN_SOME,
1782 SOCKET_OPEN_ALL,
1783 };
1784
1785 static int socket_check_open(Socket *s) {
1786 bool have_open = false, have_closed = false;
1787
1788 assert(s);
1789
1790 LIST_FOREACH(port, p, s->ports) {
1791 if (p->fd < 0)
1792 have_closed = true;
1793 else
1794 have_open = true;
1795
1796 if (have_open && have_closed)
1797 return SOCKET_OPEN_SOME;
1798 }
1799
1800 if (have_open)
1801 return SOCKET_OPEN_ALL;
1802
1803 return SOCKET_OPEN_NONE;
1804 }
1805
1806 static void socket_set_state(Socket *s, SocketState state) {
1807 SocketState old_state;
1808 assert(s);
1809
1810 if (s->state != state)
1811 bus_unit_send_pending_change_signal(UNIT(s), false);
1812
1813 old_state = s->state;
1814 s->state = state;
1815
1816 if (!IN_SET(state,
1817 SOCKET_START_PRE,
1818 SOCKET_START_CHOWN,
1819 SOCKET_START_POST,
1820 SOCKET_STOP_PRE,
1821 SOCKET_STOP_PRE_SIGTERM,
1822 SOCKET_STOP_PRE_SIGKILL,
1823 SOCKET_STOP_POST,
1824 SOCKET_FINAL_SIGTERM,
1825 SOCKET_FINAL_SIGKILL,
1826 SOCKET_CLEANING)) {
1827
1828 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1829 socket_unwatch_control_pid(s);
1830 s->control_command = NULL;
1831 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1832 }
1833
1834 if (state != SOCKET_LISTENING)
1835 socket_unwatch_fds(s);
1836
1837 if (!IN_SET(state,
1838 SOCKET_START_CHOWN,
1839 SOCKET_START_POST,
1840 SOCKET_LISTENING,
1841 SOCKET_RUNNING,
1842 SOCKET_STOP_PRE,
1843 SOCKET_STOP_PRE_SIGTERM,
1844 SOCKET_STOP_PRE_SIGKILL,
1845 SOCKET_CLEANING))
1846 socket_close_fds(s);
1847
1848 if (state != old_state)
1849 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1850
1851 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1852 }
1853
1854 static int socket_coldplug(Unit *u) {
1855 Socket *s = SOCKET(u);
1856 int r;
1857
1858 assert(s);
1859 assert(s->state == SOCKET_DEAD);
1860
1861 if (s->deserialized_state == s->state)
1862 return 0;
1863
1864 if (s->control_pid > 0 &&
1865 pid_is_unwaited(s->control_pid) &&
1866 IN_SET(s->deserialized_state,
1867 SOCKET_START_PRE,
1868 SOCKET_START_CHOWN,
1869 SOCKET_START_POST,
1870 SOCKET_STOP_PRE,
1871 SOCKET_STOP_PRE_SIGTERM,
1872 SOCKET_STOP_PRE_SIGKILL,
1873 SOCKET_STOP_POST,
1874 SOCKET_FINAL_SIGTERM,
1875 SOCKET_FINAL_SIGKILL,
1876 SOCKET_CLEANING)) {
1877
1878 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1879 if (r < 0)
1880 return r;
1881
1882 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1883 if (r < 0)
1884 return r;
1885 }
1886
1887 if (IN_SET(s->deserialized_state,
1888 SOCKET_START_CHOWN,
1889 SOCKET_START_POST,
1890 SOCKET_LISTENING,
1891 SOCKET_RUNNING)) {
1892
1893 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1894 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1895 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1896 * and if there's a mismatch, warn loudly. */
1897
1898 r = socket_check_open(s);
1899 if (r == SOCKET_OPEN_NONE)
1900 log_unit_warning(UNIT(s),
1901 "Socket unit configuration has changed while unit has been running, "
1902 "no open socket file descriptor left. "
1903 "The socket unit is not functional until restarted.");
1904 else if (r == SOCKET_OPEN_SOME)
1905 log_unit_warning(UNIT(s),
1906 "Socket unit configuration has changed while unit has been running, "
1907 "and some socket file descriptors have not been opened yet. "
1908 "The socket unit is not fully functional until restarted.");
1909 }
1910
1911 if (s->deserialized_state == SOCKET_LISTENING) {
1912 r = socket_watch_fds(s);
1913 if (r < 0)
1914 return r;
1915 }
1916
1917 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1918 (void) unit_setup_exec_runtime(u);
1919
1920 socket_set_state(s, s->deserialized_state);
1921 return 0;
1922 }
1923
1924 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1925
1926 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1927 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1928 .stdin_fd = -EBADF,
1929 .stdout_fd = -EBADF,
1930 .stderr_fd = -EBADF,
1931 .exec_fd = -EBADF,
1932 };
1933 pid_t pid;
1934 int r;
1935
1936 assert(s);
1937 assert(c);
1938 assert(_pid);
1939
1940 r = unit_prepare_exec(UNIT(s));
1941 if (r < 0)
1942 return r;
1943
1944 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1945 if (r < 0)
1946 return r;
1947
1948 r = unit_set_exec_params(UNIT(s), &exec_params);
1949 if (r < 0)
1950 return r;
1951
1952 r = exec_spawn(UNIT(s),
1953 c,
1954 &s->exec_context,
1955 &exec_params,
1956 s->exec_runtime,
1957 &s->cgroup_context,
1958 &pid);
1959 if (r < 0)
1960 return r;
1961
1962 r = unit_watch_pid(UNIT(s), pid, true);
1963 if (r < 0)
1964 return r;
1965
1966 *_pid = pid;
1967
1968 return 0;
1969 }
1970
1971 static int socket_chown(Socket *s, pid_t *_pid) {
1972 pid_t pid;
1973 int r;
1974
1975 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1976 if (r < 0)
1977 goto fail;
1978
1979 /* We have to resolve the user names out-of-process, hence
1980 * let's fork here. It's messy, but well, what can we do? */
1981
1982 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1983 if (r < 0)
1984 return r;
1985 if (r == 0) {
1986 uid_t uid = UID_INVALID;
1987 gid_t gid = GID_INVALID;
1988
1989 /* Child */
1990
1991 if (!isempty(s->user)) {
1992 const char *user = s->user;
1993
1994 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1995 if (r < 0) {
1996 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1997 _exit(EXIT_USER);
1998 }
1999 }
2000
2001 if (!isempty(s->group)) {
2002 const char *group = s->group;
2003
2004 r = get_group_creds(&group, &gid, 0);
2005 if (r < 0) {
2006 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2007 _exit(EXIT_GROUP);
2008 }
2009 }
2010
2011 LIST_FOREACH(port, p, s->ports) {
2012 const char *path = NULL;
2013
2014 if (p->type == SOCKET_SOCKET)
2015 path = socket_address_get_path(&p->address);
2016 else if (p->type == SOCKET_FIFO)
2017 path = p->path;
2018
2019 if (!path)
2020 continue;
2021
2022 if (chown(path, uid, gid) < 0) {
2023 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2024 _exit(EXIT_CHOWN);
2025 }
2026 }
2027
2028 _exit(EXIT_SUCCESS);
2029 }
2030
2031 r = unit_watch_pid(UNIT(s), pid, true);
2032 if (r < 0)
2033 goto fail;
2034
2035 *_pid = pid;
2036 return 0;
2037
2038 fail:
2039 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2040 return r;
2041 }
2042
2043 static void socket_enter_dead(Socket *s, SocketResult f) {
2044 assert(s);
2045
2046 if (s->result == SOCKET_SUCCESS)
2047 s->result = f;
2048
2049 if (s->result == SOCKET_SUCCESS)
2050 unit_log_success(UNIT(s));
2051 else
2052 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2053
2054 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2055
2056 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2057
2058 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2059
2060 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2061
2062 unit_unref_uid_gid(UNIT(s), true);
2063 }
2064
2065 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2066
2067 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2068 int r;
2069 assert(s);
2070
2071 if (s->result == SOCKET_SUCCESS)
2072 s->result = f;
2073
2074 socket_unwatch_control_pid(s);
2075 s->control_command_id = SOCKET_EXEC_STOP_POST;
2076 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2077
2078 if (s->control_command) {
2079 r = socket_spawn(s, s->control_command, &s->control_pid);
2080 if (r < 0)
2081 goto fail;
2082
2083 socket_set_state(s, SOCKET_STOP_POST);
2084 } else
2085 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2086
2087 return;
2088
2089 fail:
2090 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2091 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2092 }
2093
2094 static int state_to_kill_operation(Socket *s, SocketState state) {
2095 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2096 return KILL_RESTART;
2097
2098 if (state == SOCKET_FINAL_SIGTERM)
2099 return KILL_TERMINATE;
2100
2101 return KILL_KILL;
2102 }
2103
2104 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2105 int r;
2106
2107 assert(s);
2108
2109 if (s->result == SOCKET_SUCCESS)
2110 s->result = f;
2111
2112 r = unit_kill_context(
2113 UNIT(s),
2114 &s->kill_context,
2115 state_to_kill_operation(s, state),
2116 -1,
2117 s->control_pid,
2118 false);
2119 if (r < 0)
2120 goto fail;
2121
2122 if (r > 0) {
2123 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2124 if (r < 0)
2125 goto fail;
2126
2127 socket_set_state(s, state);
2128 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2129 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2130 else if (state == SOCKET_STOP_PRE_SIGKILL)
2131 socket_enter_stop_post(s, SOCKET_SUCCESS);
2132 else if (state == SOCKET_FINAL_SIGTERM)
2133 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2134 else
2135 socket_enter_dead(s, SOCKET_SUCCESS);
2136
2137 return;
2138
2139 fail:
2140 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2141
2142 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2143 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2144 else
2145 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2146 }
2147
2148 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2149 int r;
2150 assert(s);
2151
2152 if (s->result == SOCKET_SUCCESS)
2153 s->result = f;
2154
2155 socket_unwatch_control_pid(s);
2156 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2157 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2158
2159 if (s->control_command) {
2160 r = socket_spawn(s, s->control_command, &s->control_pid);
2161 if (r < 0)
2162 goto fail;
2163
2164 socket_set_state(s, SOCKET_STOP_PRE);
2165 } else
2166 socket_enter_stop_post(s, SOCKET_SUCCESS);
2167
2168 return;
2169
2170 fail:
2171 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2172 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2173 }
2174
2175 static void socket_enter_listening(Socket *s) {
2176 int r;
2177 assert(s);
2178
2179 if (!s->accept && s->flush_pending) {
2180 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2181 flush_ports(s);
2182 }
2183
2184 r = socket_watch_fds(s);
2185 if (r < 0) {
2186 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2187 goto fail;
2188 }
2189
2190 socket_set_state(s, SOCKET_LISTENING);
2191 return;
2192
2193 fail:
2194 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2195 }
2196
2197 static void socket_enter_start_post(Socket *s) {
2198 int r;
2199 assert(s);
2200
2201 socket_unwatch_control_pid(s);
2202 s->control_command_id = SOCKET_EXEC_START_POST;
2203 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2204
2205 if (s->control_command) {
2206 r = socket_spawn(s, s->control_command, &s->control_pid);
2207 if (r < 0) {
2208 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2209 goto fail;
2210 }
2211
2212 socket_set_state(s, SOCKET_START_POST);
2213 } else
2214 socket_enter_listening(s);
2215
2216 return;
2217
2218 fail:
2219 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2220 }
2221
2222 static void socket_enter_start_chown(Socket *s) {
2223 int r;
2224
2225 assert(s);
2226
2227 r = socket_open_fds(s);
2228 if (r < 0) {
2229 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2230 goto fail;
2231 }
2232
2233 if (!isempty(s->user) || !isempty(s->group)) {
2234
2235 socket_unwatch_control_pid(s);
2236 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2237 s->control_command = NULL;
2238
2239 r = socket_chown(s, &s->control_pid);
2240 if (r < 0) {
2241 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2242 goto fail;
2243 }
2244
2245 socket_set_state(s, SOCKET_START_CHOWN);
2246 } else
2247 socket_enter_start_post(s);
2248
2249 return;
2250
2251 fail:
2252 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2253 }
2254
2255 static void socket_enter_start_pre(Socket *s) {
2256 int r;
2257 assert(s);
2258
2259 socket_unwatch_control_pid(s);
2260
2261 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2262
2263 s->control_command_id = SOCKET_EXEC_START_PRE;
2264 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2265
2266 if (s->control_command) {
2267 r = socket_spawn(s, s->control_command, &s->control_pid);
2268 if (r < 0) {
2269 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2270 goto fail;
2271 }
2272
2273 socket_set_state(s, SOCKET_START_PRE);
2274 } else
2275 socket_enter_start_chown(s);
2276
2277 return;
2278
2279 fail:
2280 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2281 }
2282
2283 static void flush_ports(Socket *s) {
2284 assert(s);
2285
2286 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2287 * anymore */
2288
2289 LIST_FOREACH(port, p, s->ports) {
2290 if (p->fd < 0)
2291 continue;
2292
2293 (void) flush_accept(p->fd);
2294 (void) flush_fd(p->fd);
2295 }
2296 }
2297
2298 static void socket_enter_running(Socket *s, int cfd_in) {
2299 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2300 * somewhere or close it. */
2301 _cleanup_close_ int cfd = cfd_in;
2302
2303 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2304 int r;
2305
2306 assert(s);
2307
2308 /* We don't take connections anymore if we are supposed to shut down anyway */
2309 if (unit_stop_pending(UNIT(s))) {
2310
2311 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2312
2313 if (cfd >= 0)
2314 goto refuse;
2315
2316 flush_ports(s);
2317 return;
2318 }
2319
2320 if (!ratelimit_below(&s->trigger_limit)) {
2321 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2322 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2323 goto refuse;
2324 }
2325
2326 if (cfd < 0) {
2327 bool pending = false;
2328 Unit *other;
2329
2330 /* If there's already a start pending don't bother to do anything */
2331 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2332 if (unit_active_or_pending(other)) {
2333 pending = true;
2334 break;
2335 }
2336
2337 if (!pending) {
2338 if (!UNIT_ISSET(s->service)) {
2339 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2340 "Service to activate vanished, refusing activation.");
2341 goto fail;
2342 }
2343
2344 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2345 if (r < 0)
2346 goto fail;
2347 }
2348
2349 socket_set_state(s, SOCKET_RUNNING);
2350 } else {
2351 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2352 Unit *service;
2353
2354 if (s->n_connections >= s->max_connections) {
2355 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2356 s->n_connections);
2357 goto refuse;
2358 }
2359
2360 if (s->max_connections_per_source > 0) {
2361 r = socket_acquire_peer(s, cfd, &p);
2362 if (r < 0) {
2363 if (ERRNO_IS_DISCONNECT(r))
2364 return;
2365 /* We didn't have enough resources to acquire peer information, let's fail. */
2366 goto fail;
2367 }
2368 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2369 _cleanup_free_ char *t = NULL;
2370
2371 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2372
2373 log_unit_warning(UNIT(s),
2374 "Too many incoming connections (%u) from source %s, dropping connection.",
2375 p->n_ref, strnull(t));
2376 goto refuse;
2377 }
2378 }
2379
2380 r = socket_load_service_unit(s, cfd, &service);
2381 if (r < 0) {
2382 if (ERRNO_IS_DISCONNECT(r))
2383 return;
2384 goto fail;
2385 }
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 (r < 0) {
2396 if (ERRNO_IS_DISCONNECT(r))
2397 return;
2398 goto fail;
2399 }
2400
2401 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2402 s->n_connections++;
2403
2404 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2405 if (r < 0) {
2406 /* We failed to activate the new service, but it still exists. Let's make sure the
2407 * service closes and forgets the connection fd again, immediately. */
2408 service_release_socket_fd(SERVICE(service));
2409 goto fail;
2410 }
2411
2412 /* Notify clients about changed counters */
2413 unit_add_to_dbus_queue(UNIT(s));
2414 }
2415
2416 TAKE_FD(cfd);
2417 return;
2418
2419 refuse:
2420 s->n_refused++;
2421 return;
2422
2423 fail:
2424 if (ERRNO_IS_RESOURCE(r))
2425 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2426 bus_error_message(&error, r));
2427 else
2428 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2429 cfd >= 0 ? "template" : "non-template",
2430 bus_error_message(&error, r));
2431
2432 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2433 }
2434
2435 static void socket_run_next(Socket *s) {
2436 int r;
2437
2438 assert(s);
2439 assert(s->control_command);
2440 assert(s->control_command->command_next);
2441
2442 socket_unwatch_control_pid(s);
2443
2444 s->control_command = s->control_command->command_next;
2445
2446 r = socket_spawn(s, s->control_command, &s->control_pid);
2447 if (r < 0)
2448 goto fail;
2449
2450 return;
2451
2452 fail:
2453 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2454
2455 if (s->state == SOCKET_START_POST)
2456 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2457 else if (s->state == SOCKET_STOP_POST)
2458 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2459 else
2460 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2461 }
2462
2463 static int socket_start(Unit *u) {
2464 Socket *s = SOCKET(u);
2465 int r;
2466
2467 assert(s);
2468
2469 /* We cannot fulfill this request right now, try again later
2470 * please! */
2471 if (IN_SET(s->state,
2472 SOCKET_STOP_PRE,
2473 SOCKET_STOP_PRE_SIGKILL,
2474 SOCKET_STOP_PRE_SIGTERM,
2475 SOCKET_STOP_POST,
2476 SOCKET_FINAL_SIGTERM,
2477 SOCKET_FINAL_SIGKILL,
2478 SOCKET_CLEANING))
2479 return -EAGAIN;
2480
2481 /* Already on it! */
2482 if (IN_SET(s->state,
2483 SOCKET_START_PRE,
2484 SOCKET_START_CHOWN,
2485 SOCKET_START_POST))
2486 return 0;
2487
2488 /* Cannot run this without the service being around */
2489 if (UNIT_ISSET(s->service)) {
2490 Service *service;
2491
2492 service = SERVICE(UNIT_DEREF(s->service));
2493
2494 if (UNIT(service)->load_state != UNIT_LOADED)
2495 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2496
2497 /* If the service is already active we cannot start the
2498 * socket */
2499 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED_BEFORE_AUTO_RESTART, SERVICE_AUTO_RESTART))
2500 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2501 }
2502
2503 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2504
2505 r = unit_acquire_invocation_id(u);
2506 if (r < 0)
2507 return r;
2508
2509 s->result = SOCKET_SUCCESS;
2510 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2511
2512 u->reset_accounting = true;
2513
2514 socket_enter_start_pre(s);
2515 return 1;
2516 }
2517
2518 static int socket_stop(Unit *u) {
2519 Socket *s = SOCKET(u);
2520
2521 assert(s);
2522
2523 /* Already on it */
2524 if (IN_SET(s->state,
2525 SOCKET_STOP_PRE,
2526 SOCKET_STOP_PRE_SIGTERM,
2527 SOCKET_STOP_PRE_SIGKILL,
2528 SOCKET_STOP_POST,
2529 SOCKET_FINAL_SIGTERM,
2530 SOCKET_FINAL_SIGKILL))
2531 return 0;
2532
2533 /* If there's already something running we go directly into
2534 * kill mode. */
2535 if (IN_SET(s->state,
2536 SOCKET_START_PRE,
2537 SOCKET_START_CHOWN,
2538 SOCKET_START_POST)) {
2539 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2540 return -EAGAIN;
2541 }
2542
2543 /* If we are currently cleaning, then abort it, brutally. */
2544 if (s->state == SOCKET_CLEANING) {
2545 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2546 return 0;
2547 }
2548
2549 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2550
2551 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2552 return 1;
2553 }
2554
2555 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2556 Socket *s = SOCKET(u);
2557 int r;
2558
2559 assert(u);
2560 assert(f);
2561 assert(fds);
2562
2563 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2564 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2565 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2566 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2567
2568 if (s->control_pid > 0)
2569 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2570
2571 if (s->control_command_id >= 0)
2572 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2573
2574 LIST_FOREACH(port, p, s->ports) {
2575 int copy;
2576
2577 if (p->fd < 0)
2578 continue;
2579
2580 copy = fdset_put_dup(fds, p->fd);
2581 if (copy < 0)
2582 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2583
2584 if (p->type == SOCKET_SOCKET) {
2585 _cleanup_free_ char *t = NULL;
2586
2587 r = socket_address_print(&p->address, &t);
2588 if (r < 0)
2589 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2590
2591 if (socket_address_family(&p->address) == AF_NETLINK)
2592 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2593 else
2594 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2595 } else if (p->type == SOCKET_SPECIAL)
2596 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2597 else if (p->type == SOCKET_MQUEUE)
2598 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2599 else if (p->type == SOCKET_USB_FUNCTION)
2600 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2601 else {
2602 assert(p->type == SOCKET_FIFO);
2603 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2604 }
2605 }
2606
2607 return 0;
2608 }
2609
2610 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2611 Socket *s = SOCKET(u);
2612 int r;
2613
2614 assert(u);
2615 assert(key);
2616 assert(value);
2617
2618 if (streq(key, "state")) {
2619 SocketState state;
2620
2621 state = socket_state_from_string(value);
2622 if (state < 0)
2623 log_unit_debug(u, "Failed to parse state value: %s", value);
2624 else
2625 s->deserialized_state = state;
2626 } else if (streq(key, "result")) {
2627 SocketResult f;
2628
2629 f = socket_result_from_string(value);
2630 if (f < 0)
2631 log_unit_debug(u, "Failed to parse result value: %s", value);
2632 else if (f != SOCKET_SUCCESS)
2633 s->result = f;
2634
2635 } else if (streq(key, "n-accepted")) {
2636 unsigned k;
2637
2638 if (safe_atou(value, &k) < 0)
2639 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2640 else
2641 s->n_accepted += k;
2642 } else if (streq(key, "n-refused")) {
2643 unsigned k;
2644
2645 if (safe_atou(value, &k) < 0)
2646 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2647 else
2648 s->n_refused += k;
2649 } else if (streq(key, "control-pid")) {
2650 pid_t pid;
2651
2652 if (parse_pid(value, &pid) < 0)
2653 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2654 else
2655 s->control_pid = pid;
2656 } else if (streq(key, "control-command")) {
2657 SocketExecCommand id;
2658
2659 id = socket_exec_command_from_string(value);
2660 if (id < 0)
2661 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2662 else {
2663 s->control_command_id = id;
2664 s->control_command = s->exec_command[id];
2665 }
2666 } else if (streq(key, "fifo")) {
2667 _cleanup_free_ char *fdv = NULL;
2668 bool found = false;
2669 int fd;
2670
2671 r = extract_first_word(&value, &fdv, NULL, 0);
2672 if (r <= 0) {
2673 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2674 return 0;
2675 }
2676
2677 fd = parse_fd(fdv);
2678 if (fd < 0 || !fdset_contains(fds, fd)) {
2679 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2680 return 0;
2681 }
2682
2683 LIST_FOREACH(port, p, s->ports)
2684 if (p->fd < 0 &&
2685 p->type == SOCKET_FIFO &&
2686 path_equal_or_inode_same(p->path, value, 0)) {
2687 p->fd = fdset_remove(fds, fd);
2688 found = true;
2689 break;
2690 }
2691 if (!found)
2692 log_unit_debug(u, "No matching fifo socket found: %s", value);
2693
2694 } else if (streq(key, "special")) {
2695 _cleanup_free_ char *fdv = NULL;
2696 bool found = false;
2697 int fd;
2698
2699 r = extract_first_word(&value, &fdv, NULL, 0);
2700 if (r <= 0) {
2701 log_unit_debug(u, "Failed to parse special value: %s", value);
2702 return 0;
2703 }
2704
2705 fd = parse_fd(fdv);
2706 if (fd < 0 || !fdset_contains(fds, fd)) {
2707 log_unit_debug(u, "Invalid special value: %s", fdv);
2708 return 0;
2709 }
2710
2711 LIST_FOREACH(port, p, s->ports)
2712 if (p->fd < 0 &&
2713 p->type == SOCKET_SPECIAL &&
2714 path_equal_or_inode_same(p->path, value, 0)) {
2715 p->fd = fdset_remove(fds, fd);
2716 found = true;
2717 break;
2718 }
2719 if (!found)
2720 log_unit_debug(u, "No matching special socket found: %s", value);
2721
2722 } else if (streq(key, "mqueue")) {
2723 _cleanup_free_ char *fdv = NULL;
2724 bool found = false;
2725 int fd;
2726
2727 r = extract_first_word(&value, &fdv, NULL, 0);
2728 if (r <= 0) {
2729 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2730 return 0;
2731 }
2732
2733 fd = parse_fd(fdv);
2734 if (fd < 0 || !fdset_contains(fds, fd)) {
2735 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2736 return 0;
2737 }
2738
2739 LIST_FOREACH(port, p, s->ports)
2740 if (p->fd < 0 &&
2741 p->type == SOCKET_MQUEUE &&
2742 streq(p->path, value)) {
2743 p->fd = fdset_remove(fds, fd);
2744 found = true;
2745 break;
2746 }
2747 if (!found)
2748 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2749
2750 } else if (streq(key, "socket")) {
2751 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2752 bool found = false;
2753 int fd, type;
2754
2755 r = extract_first_word(&value, &fdv, NULL, 0);
2756 if (r <= 0) {
2757 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2758 return 0;
2759 }
2760
2761 fd = parse_fd(fdv);
2762 if (fd < 0 || !fdset_contains(fds, fd)) {
2763 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2764 return 0;
2765 }
2766
2767 r = extract_first_word(&value, &typev, NULL, 0);
2768 if (r <= 0) {
2769 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2770 return 0;
2771 }
2772
2773 if (safe_atoi(typev, &type) < 0 || type < 0) {
2774 log_unit_debug(u, "Invalid socket type: %s", typev);
2775 return 0;
2776 }
2777
2778 LIST_FOREACH(port, p, s->ports)
2779 if (p->fd < 0 &&
2780 socket_address_is(&p->address, value, type)) {
2781 p->fd = fdset_remove(fds, fd);
2782 found = true;
2783 break;
2784 }
2785 if (!found)
2786 log_unit_debug(u, "No matching %s socket found: %s",
2787 socket_address_type_to_string(type), value);
2788
2789 } else if (streq(key, "netlink")) {
2790 _cleanup_free_ char *fdv = NULL;
2791 bool found = false;
2792 int fd;
2793
2794 r = extract_first_word(&value, &fdv, NULL, 0);
2795 if (r <= 0) {
2796 log_unit_debug(u, "Failed to parse socket value: %s", value);
2797 return 0;
2798 }
2799
2800 fd = parse_fd(fdv);
2801 if (fd < 0 || !fdset_contains(fds, fd)) {
2802 log_unit_debug(u, "Invalid socket value: %s", fdv);
2803 return 0;
2804 }
2805
2806 LIST_FOREACH(port, p, s->ports)
2807 if (p->fd < 0 &&
2808 socket_address_is_netlink(&p->address, value)) {
2809 p->fd = fdset_remove(fds, fd);
2810 found = true;
2811 break;
2812 }
2813 if (!found)
2814 log_unit_debug(u, "No matching netlink socket found: %s", value);
2815
2816 } else if (streq(key, "ffs")) {
2817 _cleanup_free_ char *fdv = NULL;
2818 bool found = false;
2819 int fd;
2820
2821 r = extract_first_word(&value, &fdv, NULL, 0);
2822 if (r <= 0) {
2823 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2824 return 0;
2825 }
2826
2827 fd = parse_fd(fdv);
2828 if (fd < 0 || !fdset_contains(fds, fd)) {
2829 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2830 return 0;
2831 }
2832
2833 LIST_FOREACH(port, p, s->ports)
2834 if (p->fd < 0 &&
2835 p->type == SOCKET_USB_FUNCTION &&
2836 path_equal_or_inode_same(p->path, value, 0)) {
2837 p->fd = fdset_remove(fds, fd);
2838 found = true;
2839 break;
2840 }
2841 if (!found)
2842 log_unit_debug(u, "No matching ffs socket found: %s", value);
2843
2844 } else
2845 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2846
2847 return 0;
2848 }
2849
2850 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2851 Socket *s = SOCKET(u);
2852
2853 assert(u);
2854
2855 LIST_FOREACH(port, p, s->ports) {
2856 int fd;
2857
2858 if (p->type != SOCKET_SOCKET)
2859 continue;
2860
2861 if (p->fd >= 0)
2862 continue;
2863
2864 FDSET_FOREACH(fd, fds) {
2865 if (socket_address_matches_fd(&p->address, fd)) {
2866 p->fd = fdset_remove(fds, fd);
2867 s->deserialized_state = SOCKET_LISTENING;
2868 break;
2869 }
2870 }
2871 }
2872 }
2873
2874 static UnitActiveState socket_active_state(Unit *u) {
2875 assert(u);
2876
2877 return state_translation_table[SOCKET(u)->state];
2878 }
2879
2880 static const char *socket_sub_state_to_string(Unit *u) {
2881 assert(u);
2882
2883 return socket_state_to_string(SOCKET(u)->state);
2884 }
2885
2886 const char* socket_port_type_to_string(SocketPort *p) {
2887
2888 assert(p);
2889
2890 switch (p->type) {
2891
2892 case SOCKET_SOCKET:
2893
2894 switch (p->address.type) {
2895
2896 case SOCK_STREAM:
2897 return "Stream";
2898
2899 case SOCK_DGRAM:
2900 return "Datagram";
2901
2902 case SOCK_SEQPACKET:
2903 return "SequentialPacket";
2904
2905 case SOCK_RAW:
2906 if (socket_address_family(&p->address) == AF_NETLINK)
2907 return "Netlink";
2908
2909 _fallthrough_;
2910 default:
2911 return NULL;
2912 }
2913
2914 case SOCKET_SPECIAL:
2915 return "Special";
2916
2917 case SOCKET_MQUEUE:
2918 return "MessageQueue";
2919
2920 case SOCKET_FIFO:
2921 return "FIFO";
2922
2923 case SOCKET_USB_FUNCTION:
2924 return "USBFunction";
2925
2926 default:
2927 return NULL;
2928 }
2929 }
2930
2931 SocketType socket_port_type_from_string(const char *s) {
2932 assert(s);
2933
2934 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2935 return SOCKET_SOCKET;
2936 else if (streq(s, "Special"))
2937 return SOCKET_SPECIAL;
2938 else if (streq(s, "MessageQueue"))
2939 return SOCKET_MQUEUE;
2940 else if (streq(s, "FIFO"))
2941 return SOCKET_FIFO;
2942 else if (streq(s, "USBFunction"))
2943 return SOCKET_USB_FUNCTION;
2944 else
2945 return _SOCKET_TYPE_INVALID;
2946 }
2947
2948 static bool socket_may_gc(Unit *u) {
2949 Socket *s = SOCKET(u);
2950
2951 assert(u);
2952
2953 return s->n_connections == 0;
2954 }
2955
2956 static int socket_accept_do(Socket *s, int fd) {
2957 int cfd;
2958
2959 assert(s);
2960 assert(fd >= 0);
2961
2962 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2963 if (cfd < 0)
2964 /* Convert transient network errors into clean and well-defined EAGAIN */
2965 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2966
2967 return cfd;
2968 }
2969
2970 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2971 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2972 int cfd, r;
2973 pid_t pid;
2974
2975 assert(s);
2976 assert(p);
2977 assert(fd >= 0);
2978
2979 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2980 * connection socket is also properly associated with the cgroup. */
2981
2982 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2983 goto shortcut;
2984
2985 r = bpf_firewall_supported();
2986 if (r < 0)
2987 return r;
2988 if (r == BPF_FIREWALL_UNSUPPORTED)
2989 goto shortcut;
2990
2991 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2992 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2993
2994 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2995 if (r < 0)
2996 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2997 if (r == 0) {
2998 /* Child */
2999
3000 pair[0] = safe_close(pair[0]);
3001
3002 cfd = socket_accept_do(s, fd);
3003 if (cfd == -EAGAIN) /* spurious accept() */
3004 _exit(EXIT_SUCCESS);
3005 if (cfd < 0) {
3006 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3007 _exit(EXIT_FAILURE);
3008 }
3009
3010 r = send_one_fd(pair[1], cfd, 0);
3011 if (r < 0) {
3012 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3013 _exit(EXIT_FAILURE);
3014 }
3015
3016 _exit(EXIT_SUCCESS);
3017 }
3018
3019 pair[1] = safe_close(pair[1]);
3020 cfd = receive_one_fd(pair[0], 0);
3021
3022 /* We synchronously wait for the helper, as it shouldn't be slow */
3023 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3024 if (r < 0) {
3025 safe_close(cfd);
3026 return r;
3027 }
3028
3029 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3030 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3031 if (cfd == -EIO)
3032 return -EAGAIN;
3033 if (cfd < 0)
3034 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3035
3036 return cfd;
3037
3038 shortcut:
3039 cfd = socket_accept_do(s, fd);
3040 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3041 return -EAGAIN;
3042 if (cfd < 0)
3043 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3044
3045 return cfd;
3046 }
3047
3048 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3049 SocketPort *p = ASSERT_PTR(userdata);
3050 int cfd = -EBADF;
3051
3052 assert(fd >= 0);
3053
3054 if (p->socket->state != SOCKET_LISTENING)
3055 return 0;
3056
3057 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3058
3059 if (revents != EPOLLIN) {
3060 if (revents & EPOLLHUP)
3061 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.");
3062 else
3063 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3064 goto fail;
3065 }
3066
3067 if (p->socket->accept &&
3068 p->type == SOCKET_SOCKET &&
3069 socket_address_can_accept(&p->address)) {
3070
3071 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3072 if (cfd == -EAGAIN) /* Spurious accept() */
3073 return 0;
3074 if (cfd < 0)
3075 goto fail;
3076
3077 socket_apply_socket_options(p->socket, p, cfd);
3078 }
3079
3080 socket_enter_running(p->socket, cfd);
3081 return 0;
3082
3083 fail:
3084 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3085 return 0;
3086 }
3087
3088 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3089 Socket *s = SOCKET(u);
3090 SocketResult f;
3091
3092 assert(s);
3093 assert(pid >= 0);
3094
3095 if (pid != s->control_pid)
3096 return;
3097
3098 s->control_pid = 0;
3099
3100 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3101 f = SOCKET_SUCCESS;
3102 else if (code == CLD_EXITED)
3103 f = SOCKET_FAILURE_EXIT_CODE;
3104 else if (code == CLD_KILLED)
3105 f = SOCKET_FAILURE_SIGNAL;
3106 else if (code == CLD_DUMPED)
3107 f = SOCKET_FAILURE_CORE_DUMP;
3108 else
3109 assert_not_reached();
3110
3111 if (s->control_command) {
3112 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3113
3114 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3115 f = SOCKET_SUCCESS;
3116 }
3117
3118 unit_log_process_exit(
3119 u,
3120 "Control process",
3121 socket_exec_command_to_string(s->control_command_id),
3122 f == SOCKET_SUCCESS,
3123 code, status);
3124
3125 if (s->result == SOCKET_SUCCESS)
3126 s->result = f;
3127
3128 if (s->control_command &&
3129 s->control_command->command_next &&
3130 f == SOCKET_SUCCESS) {
3131
3132 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3133 socket_run_next(s);
3134 } else {
3135 s->control_command = NULL;
3136 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3137
3138 /* No further commands for this step, so let's figure
3139 * out what to do next */
3140
3141 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3142
3143 switch (s->state) {
3144
3145 case SOCKET_START_PRE:
3146 if (f == SOCKET_SUCCESS)
3147 socket_enter_start_chown(s);
3148 else
3149 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3150 break;
3151
3152 case SOCKET_START_CHOWN:
3153 if (f == SOCKET_SUCCESS)
3154 socket_enter_start_post(s);
3155 else
3156 socket_enter_stop_pre(s, f);
3157 break;
3158
3159 case SOCKET_START_POST:
3160 if (f == SOCKET_SUCCESS)
3161 socket_enter_listening(s);
3162 else
3163 socket_enter_stop_pre(s, f);
3164 break;
3165
3166 case SOCKET_STOP_PRE:
3167 case SOCKET_STOP_PRE_SIGTERM:
3168 case SOCKET_STOP_PRE_SIGKILL:
3169 socket_enter_stop_post(s, f);
3170 break;
3171
3172 case SOCKET_STOP_POST:
3173 case SOCKET_FINAL_SIGTERM:
3174 case SOCKET_FINAL_SIGKILL:
3175 socket_enter_dead(s, f);
3176 break;
3177
3178 case SOCKET_CLEANING:
3179
3180 if (s->clean_result == SOCKET_SUCCESS)
3181 s->clean_result = f;
3182
3183 socket_enter_dead(s, SOCKET_SUCCESS);
3184 break;
3185
3186 default:
3187 assert_not_reached();
3188 }
3189 }
3190
3191 /* Notify clients about changed exit status */
3192 unit_add_to_dbus_queue(u);
3193 }
3194
3195 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3196 Socket *s = SOCKET(userdata);
3197
3198 assert(s);
3199 assert(s->timer_event_source == source);
3200
3201 switch (s->state) {
3202
3203 case SOCKET_START_PRE:
3204 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3205 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3206 break;
3207
3208 case SOCKET_START_CHOWN:
3209 case SOCKET_START_POST:
3210 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3211 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3212 break;
3213
3214 case SOCKET_STOP_PRE:
3215 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3216 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3217 break;
3218
3219 case SOCKET_STOP_PRE_SIGTERM:
3220 if (s->kill_context.send_sigkill) {
3221 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3222 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3223 } else {
3224 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3225 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3226 }
3227 break;
3228
3229 case SOCKET_STOP_PRE_SIGKILL:
3230 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3231 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3232 break;
3233
3234 case SOCKET_STOP_POST:
3235 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3236 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3237 break;
3238
3239 case SOCKET_FINAL_SIGTERM:
3240 if (s->kill_context.send_sigkill) {
3241 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3242 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3243 } else {
3244 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3245 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3246 }
3247 break;
3248
3249 case SOCKET_FINAL_SIGKILL:
3250 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3251 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3252 break;
3253
3254 case SOCKET_CLEANING:
3255 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3256
3257 if (s->clean_result == SOCKET_SUCCESS)
3258 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3259
3260 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3261 break;
3262
3263 default:
3264 assert_not_reached();
3265 }
3266
3267 return 0;
3268 }
3269
3270 int socket_collect_fds(Socket *s, int **fds) {
3271 size_t k = 0, n = 0;
3272 int *rfds;
3273
3274 assert(s);
3275 assert(fds);
3276
3277 /* Called from the service code for requesting our fds */
3278
3279 LIST_FOREACH(port, p, s->ports) {
3280 if (p->fd >= 0)
3281 n++;
3282 n += p->n_auxiliary_fds;
3283 }
3284
3285 if (n <= 0) {
3286 *fds = NULL;
3287 return 0;
3288 }
3289
3290 rfds = new(int, n);
3291 if (!rfds)
3292 return -ENOMEM;
3293
3294 LIST_FOREACH(port, p, s->ports) {
3295 if (p->fd >= 0)
3296 rfds[k++] = p->fd;
3297 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3298 rfds[k++] = p->auxiliary_fds[i];
3299 }
3300
3301 assert(k == n);
3302
3303 *fds = rfds;
3304 return (int) n;
3305 }
3306
3307 static void socket_reset_failed(Unit *u) {
3308 Socket *s = SOCKET(u);
3309
3310 assert(s);
3311
3312 if (s->state == SOCKET_FAILED)
3313 socket_set_state(s, SOCKET_DEAD);
3314
3315 s->result = SOCKET_SUCCESS;
3316 s->clean_result = SOCKET_SUCCESS;
3317 }
3318
3319 void socket_connection_unref(Socket *s) {
3320 assert(s);
3321
3322 /* The service is dead. Yay!
3323 *
3324 * This is strictly for one-instance-per-connection
3325 * services. */
3326
3327 assert(s->n_connections > 0);
3328 s->n_connections--;
3329
3330 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3331 }
3332
3333 static void socket_trigger_notify(Unit *u, Unit *other) {
3334 Socket *s = SOCKET(u);
3335
3336 assert(u);
3337 assert(other);
3338
3339 /* Filter out invocations with bogus state */
3340 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3341 assert(other->type == UNIT_SERVICE);
3342
3343 /* Don't propagate state changes from the service if we are already down */
3344 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3345 return;
3346
3347 /* We don't care for the service state if we are in Accept=yes mode */
3348 if (s->accept)
3349 return;
3350
3351 /* Propagate start limit hit state */
3352 if (other->start_limit_hit) {
3353 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3354 return;
3355 }
3356
3357 /* Don't propagate anything if there's still a job queued */
3358 if (other->job)
3359 return;
3360
3361 if (IN_SET(SERVICE(other)->state,
3362 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3363 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3364 SERVICE_AUTO_RESTART))
3365 socket_enter_listening(s);
3366
3367 if (SERVICE(other)->state == SERVICE_RUNNING)
3368 socket_set_state(s, SOCKET_RUNNING);
3369 }
3370
3371 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3372 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid, error);
3373 }
3374
3375 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3376 Socket *s = SOCKET(u);
3377 usec_t t;
3378 int r;
3379
3380 if (!s->timer_event_source)
3381 return 0;
3382
3383 r = sd_event_source_get_time(s->timer_event_source, &t);
3384 if (r < 0)
3385 return r;
3386 if (t == USEC_INFINITY)
3387 return 0;
3388
3389 *timeout = t;
3390 return 1;
3391 }
3392
3393 char *socket_fdname(Socket *s) {
3394 assert(s);
3395
3396 /* Returns the name to use for $LISTEN_NAMES. If the user
3397 * didn't specify anything specifically, use the socket unit's
3398 * name as fallback. */
3399
3400 return s->fdname ?: UNIT(s)->id;
3401 }
3402
3403 static int socket_control_pid(Unit *u) {
3404 Socket *s = SOCKET(u);
3405
3406 assert(s);
3407
3408 return s->control_pid;
3409 }
3410
3411 static int socket_clean(Unit *u, ExecCleanMask mask) {
3412 _cleanup_strv_free_ char **l = NULL;
3413 Socket *s = SOCKET(u);
3414 int r;
3415
3416 assert(s);
3417 assert(mask != 0);
3418
3419 if (s->state != SOCKET_DEAD)
3420 return -EBUSY;
3421
3422 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3423 if (r < 0)
3424 return r;
3425
3426 if (strv_isempty(l))
3427 return -EUNATCH;
3428
3429 socket_unwatch_control_pid(s);
3430 s->clean_result = SOCKET_SUCCESS;
3431 s->control_command = NULL;
3432 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3433
3434 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3435 if (r < 0)
3436 goto fail;
3437
3438 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3439 if (r < 0)
3440 goto fail;
3441
3442 socket_set_state(s, SOCKET_CLEANING);
3443
3444 return 0;
3445
3446 fail:
3447 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3448 s->clean_result = SOCKET_FAILURE_RESOURCES;
3449 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3450 return r;
3451 }
3452
3453 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3454 Socket *s = SOCKET(u);
3455
3456 assert(s);
3457
3458 return exec_context_get_clean_mask(&s->exec_context, ret);
3459 }
3460
3461 static int socket_can_start(Unit *u) {
3462 Socket *s = SOCKET(u);
3463 int r;
3464
3465 assert(s);
3466
3467 r = unit_test_start_limit(u);
3468 if (r < 0) {
3469 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3470 return r;
3471 }
3472
3473 return 1;
3474 }
3475
3476 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3477 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3478 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3479 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3480 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3481 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3482 };
3483
3484 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3485
3486 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3487 [SOCKET_SUCCESS] = "success",
3488 [SOCKET_FAILURE_RESOURCES] = "resources",
3489 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3490 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3491 [SOCKET_FAILURE_SIGNAL] = "signal",
3492 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3493 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3494 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3495 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3496 };
3497
3498 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3499
3500 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3501 [SOCKET_TIMESTAMPING_OFF] = "off",
3502 [SOCKET_TIMESTAMPING_US] = "us",
3503 [SOCKET_TIMESTAMPING_NS] = "ns",
3504 };
3505
3506 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3507
3508 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3509 SocketTimestamping t;
3510 int r;
3511
3512 if (!p)
3513 return _SOCKET_TIMESTAMPING_INVALID;
3514
3515 t = socket_timestamping_from_string(p);
3516 if (t >= 0)
3517 return t;
3518
3519 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3520 * too. */
3521 if (streq(p, "nsec"))
3522 return SOCKET_TIMESTAMPING_NS;
3523 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3524 return SOCKET_TIMESTAMPING_US;
3525
3526 r = parse_boolean(p);
3527 if (r < 0)
3528 return _SOCKET_TIMESTAMPING_INVALID;
3529
3530 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3531 }
3532
3533 const UnitVTable socket_vtable = {
3534 .object_size = sizeof(Socket),
3535 .exec_context_offset = offsetof(Socket, exec_context),
3536 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3537 .kill_context_offset = offsetof(Socket, kill_context),
3538 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3539
3540 .sections =
3541 "Unit\0"
3542 "Socket\0"
3543 "Install\0",
3544 .private_section = "Socket",
3545
3546 .can_transient = true,
3547 .can_trigger = true,
3548 .can_fail = true,
3549
3550 .init = socket_init,
3551 .done = socket_done,
3552 .load = socket_load,
3553
3554 .coldplug = socket_coldplug,
3555
3556 .dump = socket_dump,
3557
3558 .start = socket_start,
3559 .stop = socket_stop,
3560
3561 .kill = socket_kill,
3562 .clean = socket_clean,
3563 .can_clean = socket_can_clean,
3564
3565 .get_timeout = socket_get_timeout,
3566
3567 .serialize = socket_serialize,
3568 .deserialize_item = socket_deserialize_item,
3569 .distribute_fds = socket_distribute_fds,
3570
3571 .active_state = socket_active_state,
3572 .sub_state_to_string = socket_sub_state_to_string,
3573
3574 .will_restart = unit_will_restart_default,
3575
3576 .may_gc = socket_may_gc,
3577
3578 .sigchld_event = socket_sigchld_event,
3579
3580 .trigger_notify = socket_trigger_notify,
3581
3582 .reset_failed = socket_reset_failed,
3583
3584 .control_pid = socket_control_pid,
3585
3586 .bus_set_property = bus_socket_set_property,
3587 .bus_commit_properties = bus_socket_commit_properties,
3588
3589 .status_message_formats = {
3590 .finished_start_job = {
3591 [JOB_DONE] = "Listening on %s.",
3592 [JOB_FAILED] = "Failed to listen on %s.",
3593 [JOB_TIMEOUT] = "Timed out starting %s.",
3594 },
3595 .finished_stop_job = {
3596 [JOB_DONE] = "Closed %s.",
3597 [JOB_FAILED] = "Failed stopping %s.",
3598 [JOB_TIMEOUT] = "Timed out stopping %s.",
3599 },
3600 },
3601
3602 .can_start = socket_can_start,
3603 };
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