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Merge pull request #29130 from poettering/unit-defaults
[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->defaults.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->defaults.std_output;
98 s->exec_context.std_error = u->manager->defaults.std_error;
99
100 s->control_pid = PIDREF_NULL;
101 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
102
103 s->trigger_limit.interval = USEC_INFINITY;
104 s->trigger_limit.burst = UINT_MAX;
105 }
106
107 static void socket_unwatch_control_pid(Socket *s) {
108 assert(s);
109
110 if (!pidref_is_set(&s->control_pid))
111 return;
112
113 unit_unwatch_pid(UNIT(s), s->control_pid.pid);
114 pidref_done(&s->control_pid);
115 }
116
117 static void socket_cleanup_fd_list(SocketPort *p) {
118 assert(p);
119
120 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
121 p->auxiliary_fds = mfree(p->auxiliary_fds);
122 p->n_auxiliary_fds = 0;
123 }
124
125 SocketPort *socket_port_free(SocketPort *p) {
126 if (!p)
127 return NULL;
128
129 sd_event_source_unref(p->event_source);
130
131 socket_cleanup_fd_list(p);
132 safe_close(p->fd);
133 free(p->path);
134
135 return mfree(p);
136 }
137
138 void socket_free_ports(Socket *s) {
139 assert(s);
140
141 LIST_CLEAR(port, s->ports, socket_port_free);
142 }
143
144 static void socket_done(Unit *u) {
145 Socket *s = SOCKET(u);
146 SocketPeer *p;
147
148 assert(s);
149
150 socket_free_ports(s);
151
152 while ((p = set_steal_first(s->peers_by_address)))
153 p->socket = NULL;
154
155 s->peers_by_address = set_free(s->peers_by_address);
156
157 s->exec_runtime = exec_runtime_free(s->exec_runtime);
158 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
159 s->control_command = NULL;
160
161 socket_unwatch_control_pid(s);
162
163 unit_ref_unset(&s->service);
164
165 s->tcp_congestion = mfree(s->tcp_congestion);
166 s->bind_to_device = mfree(s->bind_to_device);
167
168 s->smack = mfree(s->smack);
169 s->smack_ip_in = mfree(s->smack_ip_in);
170 s->smack_ip_out = mfree(s->smack_ip_out);
171
172 strv_free(s->symlinks);
173
174 s->user = mfree(s->user);
175 s->group = mfree(s->group);
176
177 s->fdname = mfree(s->fdname);
178
179 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
180 }
181
182 static int socket_arm_timer(Socket *s, usec_t usec) {
183 int r;
184
185 assert(s);
186
187 if (s->timer_event_source) {
188 r = sd_event_source_set_time(s->timer_event_source, usec);
189 if (r < 0)
190 return r;
191
192 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
193 }
194
195 if (usec == USEC_INFINITY)
196 return 0;
197
198 r = sd_event_add_time(
199 UNIT(s)->manager->event,
200 &s->timer_event_source,
201 CLOCK_MONOTONIC,
202 usec, 0,
203 socket_dispatch_timer, s);
204 if (r < 0)
205 return r;
206
207 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
208
209 return 0;
210 }
211
212 static bool have_non_accept_socket(Socket *s) {
213 assert(s);
214
215 if (!s->accept)
216 return true;
217
218 LIST_FOREACH(port, p, s->ports) {
219
220 if (p->type != SOCKET_SOCKET)
221 return true;
222
223 if (!socket_address_can_accept(&p->address))
224 return true;
225 }
226
227 return false;
228 }
229
230 static int socket_add_mount_dependencies(Socket *s) {
231 int r;
232
233 assert(s);
234
235 LIST_FOREACH(port, p, s->ports) {
236 const char *path = NULL;
237
238 if (p->type == SOCKET_SOCKET)
239 path = socket_address_get_path(&p->address);
240 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
241 path = p->path;
242
243 if (!path)
244 continue;
245
246 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
247 if (r < 0)
248 return r;
249 }
250
251 return 0;
252 }
253
254 static int socket_add_device_dependencies(Socket *s) {
255 char *t;
256
257 assert(s);
258
259 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
260 return 0;
261
262 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
263 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
264 }
265
266 static int socket_add_default_dependencies(Socket *s) {
267 int r;
268 assert(s);
269
270 if (!UNIT(s)->default_dependencies)
271 return 0;
272
273 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
274 if (r < 0)
275 return r;
276
277 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
278 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
279 if (r < 0)
280 return r;
281 }
282
283 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
284 }
285
286 static bool socket_has_exec(Socket *s) {
287 unsigned i;
288 assert(s);
289
290 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
291 if (s->exec_command[i])
292 return true;
293
294 return false;
295 }
296
297 static int socket_add_extras(Socket *s) {
298 Unit *u = UNIT(s);
299 int r;
300
301 assert(s);
302
303 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
304 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
305 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
306 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
307 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
308 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
309 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
310 * service starts are typical. */
311
312 if (s->trigger_limit.interval == USEC_INFINITY)
313 s->trigger_limit.interval = 2 * USEC_PER_SEC;
314
315 if (s->trigger_limit.burst == UINT_MAX) {
316 if (s->accept)
317 s->trigger_limit.burst = 200;
318 else
319 s->trigger_limit.burst = 20;
320 }
321
322 if (have_non_accept_socket(s)) {
323
324 if (!UNIT_DEREF(s->service)) {
325 Unit *x;
326
327 r = unit_load_related_unit(u, ".service", &x);
328 if (r < 0)
329 return r;
330
331 unit_ref_set(&s->service, u, x);
332 }
333
334 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
335 if (r < 0)
336 return r;
337 }
338
339 r = socket_add_mount_dependencies(s);
340 if (r < 0)
341 return r;
342
343 r = socket_add_device_dependencies(s);
344 if (r < 0)
345 return r;
346
347 r = unit_patch_contexts(u);
348 if (r < 0)
349 return r;
350
351 if (socket_has_exec(s)) {
352 r = unit_add_exec_dependencies(u, &s->exec_context);
353 if (r < 0)
354 return r;
355 }
356
357 r = unit_set_default_slice(u);
358 if (r < 0)
359 return r;
360
361 r = socket_add_default_dependencies(s);
362 if (r < 0)
363 return r;
364
365 return 0;
366 }
367
368 static const char *socket_find_symlink_target(Socket *s) {
369 const char *found = NULL;
370
371 LIST_FOREACH(port, p, s->ports) {
372 const char *f = NULL;
373
374 switch (p->type) {
375
376 case SOCKET_FIFO:
377 f = p->path;
378 break;
379
380 case SOCKET_SOCKET:
381 f = socket_address_get_path(&p->address);
382 break;
383
384 default:
385 break;
386 }
387
388 if (f) {
389 if (found)
390 return NULL;
391
392 found = f;
393 }
394 }
395
396 return found;
397 }
398
399 static int socket_verify(Socket *s) {
400 assert(s);
401 assert(UNIT(s)->load_state == UNIT_LOADED);
402
403 if (!s->ports)
404 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
405
406 if (s->accept && have_non_accept_socket(s))
407 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
408
409 if (s->accept && s->max_connections <= 0)
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
411
412 if (s->accept && UNIT_DEREF(s->service))
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
414
415 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
417
418 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
420
421 return 0;
422 }
423
424 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
425 assert(s);
426
427 if (s->peer.sa.sa_family == AF_INET)
428 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
429 else if (s->peer.sa.sa_family == AF_INET6)
430 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
431 else if (s->peer.sa.sa_family == AF_VSOCK)
432 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
433 else
434 assert_not_reached();
435 }
436
437 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
438 int r;
439
440 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
441 if (r != 0)
442 return r;
443
444 switch (x->peer.sa.sa_family) {
445 case AF_INET:
446 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
447 case AF_INET6:
448 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
449 case AF_VSOCK:
450 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
451 }
452 assert_not_reached();
453 }
454
455 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
456
457 static int socket_load(Unit *u) {
458 Socket *s = SOCKET(u);
459 int r;
460
461 assert(u);
462 assert(u->load_state == UNIT_STUB);
463
464 r = unit_load_fragment_and_dropin(u, true);
465 if (r < 0)
466 return r;
467
468 if (u->load_state != UNIT_LOADED)
469 return 0;
470
471 /* This is a new unit? Then let's add in some extras */
472 r = socket_add_extras(s);
473 if (r < 0)
474 return r;
475
476 return socket_verify(s);
477 }
478
479 static SocketPeer *socket_peer_new(void) {
480 SocketPeer *p;
481
482 p = new(SocketPeer, 1);
483 if (!p)
484 return NULL;
485
486 *p = (SocketPeer) {
487 .n_ref = 1,
488 };
489 return p;
490 }
491
492 static SocketPeer *socket_peer_free(SocketPeer *p) {
493 assert(p);
494
495 if (p->socket)
496 set_remove(p->socket->peers_by_address, p);
497
498 return mfree(p);
499 }
500
501 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
502
503 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
504 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
505 SocketPeer sa = {
506 .peer_salen = sizeof(union sockaddr_union),
507 }, *i;
508 int r;
509
510 assert(fd >= 0);
511 assert(s);
512
513 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
514 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
515
516 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
517 *p = NULL;
518 return 0;
519 }
520
521 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
522 if (r < 0)
523 return r;
524
525 i = set_get(s->peers_by_address, &sa);
526 if (i) {
527 *p = socket_peer_ref(i);
528 return 1;
529 }
530
531 remote = socket_peer_new();
532 if (!remote)
533 return log_oom();
534
535 remote->peer = sa.peer;
536 remote->peer_salen = sa.peer_salen;
537
538 r = set_put(s->peers_by_address, remote);
539 if (r < 0)
540 return r;
541
542 remote->socket = s;
543
544 *p = TAKE_PTR(remote);
545 return 1;
546 }
547
548 static const char* listen_lookup(int family, int type) {
549
550 if (family == AF_NETLINK)
551 return "ListenNetlink";
552
553 if (type == SOCK_STREAM)
554 return "ListenStream";
555 else if (type == SOCK_DGRAM)
556 return "ListenDatagram";
557 else if (type == SOCK_SEQPACKET)
558 return "ListenSequentialPacket";
559
560 assert_not_reached();
561 return NULL;
562 }
563
564 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
565 Socket *s = SOCKET(u);
566 const char *prefix2, *str;
567
568 assert(s);
569 assert(f);
570
571 prefix = strempty(prefix);
572 prefix2 = strjoina(prefix, "\t");
573
574 fprintf(f,
575 "%sSocket State: %s\n"
576 "%sResult: %s\n"
577 "%sClean Result: %s\n"
578 "%sBindIPv6Only: %s\n"
579 "%sBacklog: %u\n"
580 "%sSocketMode: %04o\n"
581 "%sDirectoryMode: %04o\n"
582 "%sKeepAlive: %s\n"
583 "%sNoDelay: %s\n"
584 "%sFreeBind: %s\n"
585 "%sTransparent: %s\n"
586 "%sBroadcast: %s\n"
587 "%sPassCredentials: %s\n"
588 "%sPassSecurity: %s\n"
589 "%sPassPacketInfo: %s\n"
590 "%sTCPCongestion: %s\n"
591 "%sRemoveOnStop: %s\n"
592 "%sWritable: %s\n"
593 "%sFileDescriptorName: %s\n"
594 "%sSELinuxContextFromNet: %s\n",
595 prefix, socket_state_to_string(s->state),
596 prefix, socket_result_to_string(s->result),
597 prefix, socket_result_to_string(s->clean_result),
598 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
599 prefix, s->backlog,
600 prefix, s->socket_mode,
601 prefix, s->directory_mode,
602 prefix, yes_no(s->keep_alive),
603 prefix, yes_no(s->no_delay),
604 prefix, yes_no(s->free_bind),
605 prefix, yes_no(s->transparent),
606 prefix, yes_no(s->broadcast),
607 prefix, yes_no(s->pass_cred),
608 prefix, yes_no(s->pass_sec),
609 prefix, yes_no(s->pass_pktinfo),
610 prefix, strna(s->tcp_congestion),
611 prefix, yes_no(s->remove_on_stop),
612 prefix, yes_no(s->writable),
613 prefix, socket_fdname(s),
614 prefix, yes_no(s->selinux_context_from_net));
615
616 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
617 fprintf(f,
618 "%sTimestamping: %s\n",
619 prefix, socket_timestamping_to_string(s->timestamping));
620
621 if (pidref_is_set(&s->control_pid))
622 fprintf(f,
623 "%sControl PID: "PID_FMT"\n",
624 prefix, s->control_pid.pid);
625
626 if (s->bind_to_device)
627 fprintf(f,
628 "%sBindToDevice: %s\n",
629 prefix, s->bind_to_device);
630
631 if (s->accept)
632 fprintf(f,
633 "%sAccepted: %u\n"
634 "%sNConnections: %u\n"
635 "%sMaxConnections: %u\n"
636 "%sMaxConnectionsPerSource: %u\n",
637 prefix, s->n_accepted,
638 prefix, s->n_connections,
639 prefix, s->max_connections,
640 prefix, s->max_connections_per_source);
641 else
642 fprintf(f,
643 "%sFlushPending: %s\n",
644 prefix, yes_no(s->flush_pending));
645
646
647 if (s->priority >= 0)
648 fprintf(f,
649 "%sPriority: %i\n",
650 prefix, s->priority);
651
652 if (s->receive_buffer > 0)
653 fprintf(f,
654 "%sReceiveBuffer: %zu\n",
655 prefix, s->receive_buffer);
656
657 if (s->send_buffer > 0)
658 fprintf(f,
659 "%sSendBuffer: %zu\n",
660 prefix, s->send_buffer);
661
662 if (s->ip_tos >= 0)
663 fprintf(f,
664 "%sIPTOS: %i\n",
665 prefix, s->ip_tos);
666
667 if (s->ip_ttl >= 0)
668 fprintf(f,
669 "%sIPTTL: %i\n",
670 prefix, s->ip_ttl);
671
672 if (s->pipe_size > 0)
673 fprintf(f,
674 "%sPipeSize: %zu\n",
675 prefix, s->pipe_size);
676
677 if (s->mark >= 0)
678 fprintf(f,
679 "%sMark: %i\n",
680 prefix, s->mark);
681
682 if (s->mq_maxmsg > 0)
683 fprintf(f,
684 "%sMessageQueueMaxMessages: %li\n",
685 prefix, s->mq_maxmsg);
686
687 if (s->mq_msgsize > 0)
688 fprintf(f,
689 "%sMessageQueueMessageSize: %li\n",
690 prefix, s->mq_msgsize);
691
692 if (s->reuse_port)
693 fprintf(f,
694 "%sReusePort: %s\n",
695 prefix, yes_no(s->reuse_port));
696
697 if (s->smack)
698 fprintf(f,
699 "%sSmackLabel: %s\n",
700 prefix, s->smack);
701
702 if (s->smack_ip_in)
703 fprintf(f,
704 "%sSmackLabelIPIn: %s\n",
705 prefix, s->smack_ip_in);
706
707 if (s->smack_ip_out)
708 fprintf(f,
709 "%sSmackLabelIPOut: %s\n",
710 prefix, s->smack_ip_out);
711
712 if (!isempty(s->user) || !isempty(s->group))
713 fprintf(f,
714 "%sSocketUser: %s\n"
715 "%sSocketGroup: %s\n",
716 prefix, strna(s->user),
717 prefix, strna(s->group));
718
719 if (timestamp_is_set(s->keep_alive_time))
720 fprintf(f,
721 "%sKeepAliveTimeSec: %s\n",
722 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
723
724 if (s->keep_alive_interval > 0)
725 fprintf(f,
726 "%sKeepAliveIntervalSec: %s\n",
727 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
728
729 if (s->keep_alive_cnt > 0)
730 fprintf(f,
731 "%sKeepAliveProbes: %u\n",
732 prefix, s->keep_alive_cnt);
733
734 if (s->defer_accept > 0)
735 fprintf(f,
736 "%sDeferAcceptSec: %s\n",
737 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
738
739 LIST_FOREACH(port, p, s->ports) {
740
741 switch (p->type) {
742 case SOCKET_SOCKET: {
743 _cleanup_free_ char *k = NULL;
744 int r;
745
746 r = socket_address_print(&p->address, &k);
747 if (r < 0) {
748 errno = -r;
749 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
750 } else
751 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
752 break;
753 }
754 case SOCKET_SPECIAL:
755 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
756 break;
757 case SOCKET_USB_FUNCTION:
758 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
759 break;
760 case SOCKET_MQUEUE:
761 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
762 break;
763 default:
764 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
765 }
766 }
767
768 fprintf(f,
769 "%sTriggerLimitIntervalSec: %s\n"
770 "%sTriggerLimitBurst: %u\n",
771 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
772 prefix, s->trigger_limit.burst);
773
774 str = ip_protocol_to_name(s->socket_protocol);
775 if (str)
776 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
777
778 if (!strv_isempty(s->symlinks)) {
779 fprintf(f, "%sSymlinks:", prefix);
780 STRV_FOREACH(q, s->symlinks)
781 fprintf(f, " %s", *q);
782
783 fprintf(f, "\n");
784 }
785
786 fprintf(f,
787 "%sTimeoutSec: %s\n",
788 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
789
790 exec_context_dump(&s->exec_context, f, prefix);
791 kill_context_dump(&s->kill_context, f, prefix);
792
793 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
794 if (!s->exec_command[c])
795 continue;
796
797 fprintf(f, "%s-> %s:\n",
798 prefix, socket_exec_command_to_string(c));
799
800 exec_command_dump_list(s->exec_command[c], f, prefix2);
801 }
802
803 cgroup_context_dump(UNIT(s), f, prefix);
804 }
805
806 static int instance_from_socket(int fd, unsigned nr, char **instance) {
807 socklen_t l;
808 char *r;
809 union sockaddr_union local, remote;
810
811 assert(fd >= 0);
812 assert(instance);
813
814 l = sizeof(local);
815 if (getsockname(fd, &local.sa, &l) < 0)
816 return -errno;
817
818 l = sizeof(remote);
819 if (getpeername(fd, &remote.sa, &l) < 0)
820 return -errno;
821
822 switch (local.sa.sa_family) {
823
824 case AF_INET: {
825 uint32_t
826 a = be32toh(local.in.sin_addr.s_addr),
827 b = be32toh(remote.in.sin_addr.s_addr);
828
829 if (asprintf(&r,
830 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
831 nr,
832 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
833 be16toh(local.in.sin_port),
834 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
835 be16toh(remote.in.sin_port)) < 0)
836 return -ENOMEM;
837
838 break;
839 }
840
841 case AF_INET6: {
842 static const unsigned char ipv4_prefix[] = {
843 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
844 };
845
846 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
847 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
848 const uint8_t
849 *a = local.in6.sin6_addr.s6_addr+12,
850 *b = remote.in6.sin6_addr.s6_addr+12;
851
852 if (asprintf(&r,
853 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
854 nr,
855 a[0], a[1], a[2], a[3],
856 be16toh(local.in6.sin6_port),
857 b[0], b[1], b[2], b[3],
858 be16toh(remote.in6.sin6_port)) < 0)
859 return -ENOMEM;
860 } else {
861 if (asprintf(&r,
862 "%u-%s:%u-%s:%u",
863 nr,
864 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
865 be16toh(local.in6.sin6_port),
866 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
867 be16toh(remote.in6.sin6_port)) < 0)
868 return -ENOMEM;
869 }
870
871 break;
872 }
873
874 case AF_UNIX: {
875 struct ucred ucred;
876 int k;
877
878 k = getpeercred(fd, &ucred);
879 if (k >= 0) {
880 if (asprintf(&r,
881 "%u-"PID_FMT"-"UID_FMT,
882 nr, ucred.pid, ucred.uid) < 0)
883 return -ENOMEM;
884 } else if (k == -ENODATA) {
885 /* This handles the case where somebody is
886 * connecting from another pid/uid namespace
887 * (e.g. from outside of our container). */
888 if (asprintf(&r,
889 "%u-unknown",
890 nr) < 0)
891 return -ENOMEM;
892 } else
893 return k;
894
895 break;
896 }
897
898 case AF_VSOCK:
899 if (asprintf(&r,
900 "%u-%u:%u-%u:%u",
901 nr,
902 local.vm.svm_cid, local.vm.svm_port,
903 remote.vm.svm_cid, remote.vm.svm_port) < 0)
904 return -ENOMEM;
905
906 break;
907
908 default:
909 assert_not_reached();
910 }
911
912 *instance = r;
913 return 0;
914 }
915
916 static void socket_close_fds(Socket *s) {
917 assert(s);
918
919 LIST_FOREACH(port, p, s->ports) {
920 bool was_open;
921
922 was_open = p->fd >= 0;
923
924 p->event_source = sd_event_source_disable_unref(p->event_source);
925 p->fd = safe_close(p->fd);
926 socket_cleanup_fd_list(p);
927
928 /* One little note: we should normally not delete any sockets in the file system here! After all some
929 * other process we spawned might still have a reference of this fd and wants to continue to use
930 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
931 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
932 * anyway, but only then. */
933
934 if (!was_open || !s->remove_on_stop)
935 continue;
936
937 switch (p->type) {
938
939 case SOCKET_FIFO:
940 (void) unlink(p->path);
941 break;
942
943 case SOCKET_MQUEUE:
944 (void) mq_unlink(p->path);
945 break;
946
947 case SOCKET_SOCKET:
948 (void) socket_address_unlink(&p->address);
949 break;
950
951 default:
952 break;
953 }
954 }
955
956 if (s->remove_on_stop)
957 STRV_FOREACH(i, s->symlinks)
958 (void) unlink(*i);
959
960 /* Note that we don't return NULL here, since s has not been freed. */
961 }
962
963 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
964 int r;
965
966 assert(s);
967 assert(p);
968 assert(fd >= 0);
969
970 if (s->keep_alive) {
971 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
972 if (r < 0)
973 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
974 }
975
976 if (timestamp_is_set(s->keep_alive_time)) {
977 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
978 if (r < 0)
979 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
980 }
981
982 if (s->keep_alive_interval > 0) {
983 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
984 if (r < 0)
985 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
986 }
987
988 if (s->keep_alive_cnt > 0) {
989 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
990 if (r < 0)
991 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
992 }
993
994 if (s->defer_accept > 0) {
995 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
996 if (r < 0)
997 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
998 }
999
1000 if (s->no_delay) {
1001 if (s->socket_protocol == IPPROTO_SCTP) {
1002 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1003 if (r < 0)
1004 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1005 } else {
1006 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1007 if (r < 0)
1008 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1009 }
1010 }
1011
1012 if (s->broadcast) {
1013 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1014 if (r < 0)
1015 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1016 }
1017
1018 if (s->pass_cred) {
1019 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1020 if (r < 0)
1021 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1022 }
1023
1024 if (s->pass_sec) {
1025 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1026 if (r < 0)
1027 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1028 }
1029
1030 if (s->pass_pktinfo) {
1031 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1032 if (r < 0)
1033 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1034 }
1035
1036 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1037 r = setsockopt_int(fd, SOL_SOCKET,
1038 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1039 true);
1040 if (r < 0)
1041 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1042 }
1043
1044 if (s->priority >= 0) {
1045 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1046 if (r < 0)
1047 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1048 }
1049
1050 if (s->receive_buffer > 0) {
1051 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1052 if (r < 0)
1053 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1054 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1055 }
1056
1057 if (s->send_buffer > 0) {
1058 r = fd_set_sndbuf(fd, s->send_buffer, false);
1059 if (r < 0)
1060 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1061 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1062 }
1063
1064 if (s->mark >= 0) {
1065 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1066 if (r < 0)
1067 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1068 }
1069
1070 if (s->ip_tos >= 0) {
1071 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1072 if (r < 0)
1073 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1074 }
1075
1076 if (s->ip_ttl >= 0) {
1077 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1078 if (r < 0)
1079 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1080 }
1081
1082 if (s->tcp_congestion)
1083 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1084 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1085
1086 if (s->smack_ip_in) {
1087 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1088 if (r < 0)
1089 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1090 }
1091
1092 if (s->smack_ip_out) {
1093 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1094 if (r < 0)
1095 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1096 }
1097 }
1098
1099 static void socket_apply_fifo_options(Socket *s, int fd) {
1100 int r;
1101
1102 assert(s);
1103 assert(fd >= 0);
1104
1105 if (s->pipe_size > 0)
1106 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1107 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1108
1109 if (s->smack) {
1110 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1111 if (r < 0)
1112 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1113 }
1114 }
1115
1116 static int fifo_address_create(
1117 const char *path,
1118 mode_t directory_mode,
1119 mode_t socket_mode) {
1120
1121 _cleanup_close_ int fd = -EBADF;
1122 mode_t old_mask;
1123 struct stat st;
1124 int r;
1125
1126 assert(path);
1127
1128 (void) mkdir_parents_label(path, directory_mode);
1129
1130 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1131 if (r < 0)
1132 return r;
1133
1134 /* Enforce the right access mode for the fifo */
1135 old_mask = umask(~socket_mode);
1136
1137 /* Include the original umask in our mask */
1138 (void) umask(~socket_mode | old_mask);
1139
1140 r = mkfifo(path, socket_mode);
1141 (void) umask(old_mask);
1142
1143 if (r < 0 && errno != EEXIST) {
1144 r = -errno;
1145 goto fail;
1146 }
1147
1148 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1149 if (fd < 0) {
1150 r = -errno;
1151 goto fail;
1152 }
1153
1154 mac_selinux_create_file_clear();
1155
1156 if (fstat(fd, &st) < 0) {
1157 r = -errno;
1158 goto fail;
1159 }
1160
1161 if (!S_ISFIFO(st.st_mode) ||
1162 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1163 st.st_uid != getuid() ||
1164 st.st_gid != getgid()) {
1165 r = -EEXIST;
1166 goto fail;
1167 }
1168
1169 return TAKE_FD(fd);
1170
1171 fail:
1172 mac_selinux_create_file_clear();
1173 return r;
1174 }
1175
1176 static int special_address_create(const char *path, bool writable) {
1177 _cleanup_close_ int fd = -EBADF;
1178 struct stat st;
1179
1180 assert(path);
1181
1182 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1183 if (fd < 0)
1184 return -errno;
1185
1186 if (fstat(fd, &st) < 0)
1187 return -errno;
1188
1189 /* Check whether this is a /proc, /sys or /dev file or char device */
1190 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1191 return -EEXIST;
1192
1193 return TAKE_FD(fd);
1194 }
1195
1196 static int usbffs_address_create(const char *path) {
1197 _cleanup_close_ int fd = -EBADF;
1198 struct stat st;
1199
1200 assert(path);
1201
1202 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1203 if (fd < 0)
1204 return -errno;
1205
1206 if (fstat(fd, &st) < 0)
1207 return -errno;
1208
1209 /* Check whether this is a regular file (ffs endpoint) */
1210 if (!S_ISREG(st.st_mode))
1211 return -EEXIST;
1212
1213 return TAKE_FD(fd);
1214 }
1215
1216 static int mq_address_create(
1217 const char *path,
1218 mode_t mq_mode,
1219 long maxmsg,
1220 long msgsize) {
1221
1222 _cleanup_close_ int fd = -EBADF;
1223 struct stat st;
1224 mode_t old_mask;
1225 struct mq_attr _attr, *attr = NULL;
1226
1227 assert(path);
1228
1229 if (maxmsg > 0 && msgsize > 0) {
1230 _attr = (struct mq_attr) {
1231 .mq_flags = O_NONBLOCK,
1232 .mq_maxmsg = maxmsg,
1233 .mq_msgsize = msgsize,
1234 };
1235 attr = &_attr;
1236 }
1237
1238 /* Enforce the right access mode for the mq */
1239 old_mask = umask(~mq_mode);
1240
1241 /* Include the original umask in our mask */
1242 (void) umask(~mq_mode | old_mask);
1243 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1244 (void) umask(old_mask);
1245
1246 if (fd < 0)
1247 return -errno;
1248
1249 if (fstat(fd, &st) < 0)
1250 return -errno;
1251
1252 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1253 st.st_uid != getuid() ||
1254 st.st_gid != getgid())
1255 return -EEXIST;
1256
1257 return TAKE_FD(fd);
1258 }
1259
1260 static int socket_symlink(Socket *s) {
1261 const char *p;
1262 int r;
1263
1264 assert(s);
1265
1266 p = socket_find_symlink_target(s);
1267 if (!p)
1268 return 0;
1269
1270 STRV_FOREACH(i, s->symlinks) {
1271 (void) mkdir_parents_label(*i, s->directory_mode);
1272
1273 r = symlink_idempotent(p, *i, false);
1274
1275 if (r == -EEXIST && s->remove_on_stop) {
1276 /* If there's already something where we want to create the symlink, and the destructive
1277 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1278 * again. */
1279
1280 if (unlink(*i) >= 0)
1281 r = symlink_idempotent(p, *i, false);
1282 }
1283
1284 if (r < 0)
1285 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1286 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1287 }
1288
1289 return 0;
1290 }
1291
1292 static int usbffs_write_descs(int fd, Service *s) {
1293 int r;
1294
1295 if (!s->usb_function_descriptors || !s->usb_function_strings)
1296 return -EINVAL;
1297
1298 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1299 if (r < 0)
1300 return r;
1301
1302 return copy_file_fd(s->usb_function_strings, fd, 0);
1303 }
1304
1305 static int usbffs_select_ep(const struct dirent *d) {
1306 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1307 }
1308
1309 static int usbffs_dispatch_eps(SocketPort *p) {
1310 _cleanup_free_ struct dirent **ent = NULL;
1311 size_t n, k;
1312 int r;
1313
1314 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1315 if (r < 0)
1316 return -errno;
1317
1318 n = (size_t) r;
1319 p->auxiliary_fds = new(int, n);
1320 if (!p->auxiliary_fds) {
1321 r = -ENOMEM;
1322 goto clear;
1323 }
1324
1325 p->n_auxiliary_fds = n;
1326
1327 k = 0;
1328 for (size_t i = 0; i < n; ++i) {
1329 _cleanup_free_ char *ep = NULL;
1330
1331 ep = path_make_absolute(ent[i]->d_name, p->path);
1332 if (!ep) {
1333 r = -ENOMEM;
1334 goto fail;
1335 }
1336
1337 path_simplify(ep);
1338
1339 r = usbffs_address_create(ep);
1340 if (r < 0)
1341 goto fail;
1342
1343 p->auxiliary_fds[k++] = r;
1344 }
1345
1346 r = 0;
1347 goto clear;
1348
1349 fail:
1350 close_many(p->auxiliary_fds, k);
1351 p->auxiliary_fds = mfree(p->auxiliary_fds);
1352 p->n_auxiliary_fds = 0;
1353
1354 clear:
1355 free_many((void**) ent, n);
1356 return r;
1357 }
1358
1359 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1360 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1361 *
1362 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1363 * instance name.
1364 */
1365
1366 if (UNIT_ISSET(s->service)) {
1367 *ret = UNIT_DEREF(s->service);
1368 return 0;
1369 }
1370
1371 if (!s->accept)
1372 return -ENODATA;
1373
1374 /* Build the instance name and load the unit */
1375 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1376 int r;
1377
1378 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1379 if (r < 0)
1380 return r;
1381
1382 if (cfd >= 0) {
1383 r = instance_from_socket(cfd, s->n_accepted, &instance);
1384 if (r < 0) {
1385 if (ERRNO_IS_DISCONNECT(r))
1386 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1387 * different errors. This connection is over, but the socket unit lives on. */
1388 return log_unit_debug_errno(UNIT(s), r,
1389 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1390 errno_to_name(r));
1391 return r;
1392 }
1393 }
1394
1395 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1396 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1397 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1398 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1399 if (r < 0)
1400 return r;
1401
1402 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1403 }
1404
1405 static int socket_determine_selinux_label(Socket *s, char **ret) {
1406 int r;
1407
1408 assert(s);
1409 assert(ret);
1410
1411 Unit *service;
1412 ExecCommand *c;
1413 const char *exec_context;
1414 _cleanup_free_ char *path = NULL;
1415
1416 r = socket_load_service_unit(s, -1, &service);
1417 if (r == -ENODATA)
1418 goto no_label;
1419 if (r < 0)
1420 return r;
1421
1422 exec_context = SERVICE(service)->exec_context.selinux_context;
1423 if (exec_context) {
1424 char *con;
1425
1426 con = strdup(exec_context);
1427 if (!con)
1428 return -ENOMEM;
1429
1430 *ret = TAKE_PTR(con);
1431 return 0;
1432 }
1433
1434 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1435 if (!c)
1436 goto no_label;
1437
1438 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1439 if (r < 0)
1440 goto no_label;
1441
1442 r = mac_selinux_get_create_label_from_exe(path, ret);
1443 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1444 goto no_label;
1445 return r;
1446
1447 no_label:
1448 *ret = NULL;
1449 return 0;
1450 }
1451
1452 static int socket_address_listen_do(
1453 Socket *s,
1454 const SocketAddress *address,
1455 const char *label) {
1456
1457 assert(s);
1458 assert(address);
1459
1460 return socket_address_listen(
1461 address,
1462 SOCK_CLOEXEC|SOCK_NONBLOCK,
1463 s->backlog,
1464 s->bind_ipv6_only,
1465 s->bind_to_device,
1466 s->reuse_port,
1467 s->free_bind,
1468 s->transparent,
1469 s->directory_mode,
1470 s->socket_mode,
1471 label);
1472 }
1473
1474 #define log_address_error_errno(u, address, error, fmt) \
1475 ({ \
1476 _cleanup_free_ char *_t = NULL; \
1477 \
1478 (void) socket_address_print(address, &_t); \
1479 log_unit_error_errno(u, error, fmt, strna(_t)); \
1480 })
1481
1482 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1483 int r;
1484
1485 assert(address);
1486 assert(context);
1487
1488 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1489
1490 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1491 r = bpf_firewall_supported();
1492 if (r < 0)
1493 return r;
1494 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1495 return true;
1496 }
1497
1498 return exec_needs_network_namespace(context);
1499 }
1500
1501 static int socket_address_listen_in_cgroup(
1502 Socket *s,
1503 const SocketAddress *address,
1504 const char *label) {
1505
1506 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1507 int fd, r;
1508 pid_t pid;
1509
1510 assert(s);
1511 assert(address);
1512
1513 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1514 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1515 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1516 * such. */
1517
1518 r = fork_needed(address, &s->exec_context);
1519 if (r < 0)
1520 return r;
1521 if (r == 0) {
1522 /* Shortcut things... */
1523 fd = socket_address_listen_do(s, address, label);
1524 if (fd < 0)
1525 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1526
1527 return fd;
1528 }
1529
1530 r = unit_setup_exec_runtime(UNIT(s));
1531 if (r < 0)
1532 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1533
1534 if (s->exec_context.network_namespace_path &&
1535 s->exec_runtime &&
1536 s->exec_runtime->shared &&
1537 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1538 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1539 if (r < 0)
1540 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1541 }
1542
1543 if (s->exec_context.ipc_namespace_path &&
1544 s->exec_runtime &&
1545 s->exec_runtime->shared &&
1546 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1547 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1548 if (r < 0)
1549 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1550 }
1551
1552 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1553 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1554
1555 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1556 if (r < 0)
1557 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1558 if (r == 0) {
1559 /* Child */
1560
1561 pair[0] = safe_close(pair[0]);
1562
1563 if (exec_needs_network_namespace(&s->exec_context) &&
1564 s->exec_runtime &&
1565 s->exec_runtime->shared &&
1566 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1567
1568 if (ns_type_supported(NAMESPACE_NET)) {
1569 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1570 if (r < 0) {
1571 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1572 _exit(EXIT_NETWORK);
1573 }
1574 } else if (s->exec_context.network_namespace_path) {
1575 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1576 _exit(EXIT_NETWORK);
1577 } else
1578 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1579 }
1580
1581 fd = socket_address_listen_do(s, address, label);
1582 if (fd < 0) {
1583 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1584 _exit(EXIT_FAILURE);
1585 }
1586
1587 r = send_one_fd(pair[1], fd, 0);
1588 if (r < 0) {
1589 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1590 _exit(EXIT_FAILURE);
1591 }
1592
1593 _exit(EXIT_SUCCESS);
1594 }
1595
1596 pair[1] = safe_close(pair[1]);
1597 fd = receive_one_fd(pair[0], 0);
1598
1599 /* We synchronously wait for the helper, as it shouldn't be slow */
1600 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1601 if (r < 0) {
1602 safe_close(fd);
1603 return r;
1604 }
1605
1606 if (fd < 0)
1607 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1608
1609 return fd;
1610 }
1611
1612 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1613
1614 static int socket_open_fds(Socket *orig_s) {
1615 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1616 _cleanup_(mac_selinux_freep) char *label = NULL;
1617 bool know_label = false;
1618 int r;
1619
1620 assert(s);
1621
1622 LIST_FOREACH(port, p, s->ports) {
1623
1624 if (p->fd >= 0)
1625 continue;
1626
1627 switch (p->type) {
1628
1629 case SOCKET_SOCKET:
1630
1631 if (!know_label) {
1632 /* Figure out the label, if we don't it know yet. We do it once for the first
1633 * socket where we need this and remember it for the rest. */
1634
1635 r = socket_determine_selinux_label(s, &label);
1636 if (r < 0)
1637 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1638
1639 know_label = true;
1640 }
1641
1642 /* Apply the socket protocol */
1643 switch (p->address.type) {
1644
1645 case SOCK_STREAM:
1646 case SOCK_SEQPACKET:
1647 if (s->socket_protocol == IPPROTO_SCTP)
1648 p->address.protocol = s->socket_protocol;
1649 break;
1650
1651 case SOCK_DGRAM:
1652 if (s->socket_protocol == IPPROTO_UDPLITE)
1653 p->address.protocol = s->socket_protocol;
1654 break;
1655 }
1656
1657 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1658 if (p->fd < 0)
1659 return p->fd;
1660
1661 socket_apply_socket_options(s, p, p->fd);
1662 socket_symlink(s);
1663 break;
1664
1665 case SOCKET_SPECIAL:
1666
1667 p->fd = special_address_create(p->path, s->writable);
1668 if (p->fd < 0)
1669 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1670 break;
1671
1672 case SOCKET_FIFO:
1673
1674 p->fd = fifo_address_create(
1675 p->path,
1676 s->directory_mode,
1677 s->socket_mode);
1678 if (p->fd < 0)
1679 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1680
1681 socket_apply_fifo_options(s, p->fd);
1682 socket_symlink(s);
1683 break;
1684
1685 case SOCKET_MQUEUE:
1686
1687 p->fd = mq_address_create(
1688 p->path,
1689 s->socket_mode,
1690 s->mq_maxmsg,
1691 s->mq_msgsize);
1692 if (p->fd < 0)
1693 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1694 break;
1695
1696 case SOCKET_USB_FUNCTION: {
1697 _cleanup_free_ char *ep = NULL;
1698
1699 ep = path_make_absolute("ep0", p->path);
1700 if (!ep)
1701 return -ENOMEM;
1702
1703 p->fd = usbffs_address_create(ep);
1704 if (p->fd < 0)
1705 return p->fd;
1706
1707 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1708 if (r < 0)
1709 return r;
1710
1711 r = usbffs_dispatch_eps(p);
1712 if (r < 0)
1713 return r;
1714
1715 break;
1716 }
1717 default:
1718 assert_not_reached();
1719 }
1720 }
1721
1722 s = NULL;
1723 return 0;
1724 }
1725
1726 static void socket_unwatch_fds(Socket *s) {
1727 int r;
1728
1729 assert(s);
1730
1731 LIST_FOREACH(port, p, s->ports) {
1732 if (p->fd < 0)
1733 continue;
1734
1735 if (!p->event_source)
1736 continue;
1737
1738 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1739 if (r < 0)
1740 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1741 }
1742 }
1743
1744 static int socket_watch_fds(Socket *s) {
1745 int r;
1746
1747 assert(s);
1748
1749 LIST_FOREACH(port, p, s->ports) {
1750 if (p->fd < 0)
1751 continue;
1752
1753 if (p->event_source) {
1754 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1755 if (r < 0)
1756 goto fail;
1757 } else {
1758 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1759 if (r < 0)
1760 goto fail;
1761
1762 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1763 }
1764 }
1765
1766 return 0;
1767
1768 fail:
1769 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1770 socket_unwatch_fds(s);
1771 return r;
1772 }
1773
1774 enum {
1775 SOCKET_OPEN_NONE,
1776 SOCKET_OPEN_SOME,
1777 SOCKET_OPEN_ALL,
1778 };
1779
1780 static int socket_check_open(Socket *s) {
1781 bool have_open = false, have_closed = false;
1782
1783 assert(s);
1784
1785 LIST_FOREACH(port, p, s->ports) {
1786 if (p->fd < 0)
1787 have_closed = true;
1788 else
1789 have_open = true;
1790
1791 if (have_open && have_closed)
1792 return SOCKET_OPEN_SOME;
1793 }
1794
1795 if (have_open)
1796 return SOCKET_OPEN_ALL;
1797
1798 return SOCKET_OPEN_NONE;
1799 }
1800
1801 static void socket_set_state(Socket *s, SocketState state) {
1802 SocketState old_state;
1803 assert(s);
1804
1805 if (s->state != state)
1806 bus_unit_send_pending_change_signal(UNIT(s), false);
1807
1808 old_state = s->state;
1809 s->state = state;
1810
1811 if (!IN_SET(state,
1812 SOCKET_START_PRE,
1813 SOCKET_START_CHOWN,
1814 SOCKET_START_POST,
1815 SOCKET_STOP_PRE,
1816 SOCKET_STOP_PRE_SIGTERM,
1817 SOCKET_STOP_PRE_SIGKILL,
1818 SOCKET_STOP_POST,
1819 SOCKET_FINAL_SIGTERM,
1820 SOCKET_FINAL_SIGKILL,
1821 SOCKET_CLEANING)) {
1822
1823 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1824 socket_unwatch_control_pid(s);
1825 s->control_command = NULL;
1826 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1827 }
1828
1829 if (state != SOCKET_LISTENING)
1830 socket_unwatch_fds(s);
1831
1832 if (!IN_SET(state,
1833 SOCKET_START_CHOWN,
1834 SOCKET_START_POST,
1835 SOCKET_LISTENING,
1836 SOCKET_RUNNING,
1837 SOCKET_STOP_PRE,
1838 SOCKET_STOP_PRE_SIGTERM,
1839 SOCKET_STOP_PRE_SIGKILL,
1840 SOCKET_CLEANING))
1841 socket_close_fds(s);
1842
1843 if (state != old_state)
1844 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1845
1846 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1847 }
1848
1849 static int socket_coldplug(Unit *u) {
1850 Socket *s = SOCKET(u);
1851 int r;
1852
1853 assert(s);
1854 assert(s->state == SOCKET_DEAD);
1855
1856 if (s->deserialized_state == s->state)
1857 return 0;
1858
1859 if (pidref_is_set(&s->control_pid) &&
1860 pid_is_unwaited(s->control_pid.pid) &&
1861 IN_SET(s->deserialized_state,
1862 SOCKET_START_PRE,
1863 SOCKET_START_CHOWN,
1864 SOCKET_START_POST,
1865 SOCKET_STOP_PRE,
1866 SOCKET_STOP_PRE_SIGTERM,
1867 SOCKET_STOP_PRE_SIGKILL,
1868 SOCKET_STOP_POST,
1869 SOCKET_FINAL_SIGTERM,
1870 SOCKET_FINAL_SIGKILL,
1871 SOCKET_CLEANING)) {
1872
1873 r = unit_watch_pid(UNIT(s), s->control_pid.pid, /* exclusive= */ false);
1874 if (r < 0)
1875 return r;
1876
1877 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1878 if (r < 0)
1879 return r;
1880 }
1881
1882 if (IN_SET(s->deserialized_state,
1883 SOCKET_START_CHOWN,
1884 SOCKET_START_POST,
1885 SOCKET_LISTENING,
1886 SOCKET_RUNNING)) {
1887
1888 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1889 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1890 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1891 * and if there's a mismatch, warn loudly. */
1892
1893 r = socket_check_open(s);
1894 if (r == SOCKET_OPEN_NONE)
1895 log_unit_warning(UNIT(s),
1896 "Socket unit configuration has changed while unit has been running, "
1897 "no open socket file descriptor left. "
1898 "The socket unit is not functional until restarted.");
1899 else if (r == SOCKET_OPEN_SOME)
1900 log_unit_warning(UNIT(s),
1901 "Socket unit configuration has changed while unit has been running, "
1902 "and some socket file descriptors have not been opened yet. "
1903 "The socket unit is not fully functional until restarted.");
1904 }
1905
1906 if (s->deserialized_state == SOCKET_LISTENING) {
1907 r = socket_watch_fds(s);
1908 if (r < 0)
1909 return r;
1910 }
1911
1912 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1913 (void) unit_setup_exec_runtime(u);
1914
1915 socket_set_state(s, s->deserialized_state);
1916 return 0;
1917 }
1918
1919 static int socket_spawn(Socket *s, ExecCommand *c, PidRef *ret_pid) {
1920
1921 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1922 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1923 .stdin_fd = -EBADF,
1924 .stdout_fd = -EBADF,
1925 .stderr_fd = -EBADF,
1926 .exec_fd = -EBADF,
1927 };
1928 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1929 pid_t pid;
1930 int r;
1931
1932 assert(s);
1933 assert(c);
1934 assert(ret_pid);
1935
1936 r = unit_prepare_exec(UNIT(s));
1937 if (r < 0)
1938 return r;
1939
1940 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1941 if (r < 0)
1942 return r;
1943
1944 r = unit_set_exec_params(UNIT(s), &exec_params);
1945 if (r < 0)
1946 return r;
1947
1948 r = exec_spawn(UNIT(s),
1949 c,
1950 &s->exec_context,
1951 &exec_params,
1952 s->exec_runtime,
1953 &s->cgroup_context,
1954 &pid);
1955 if (r < 0)
1956 return r;
1957
1958 r = pidref_set_pid(&pidref, pid);
1959 if (r < 0)
1960 return r;
1961
1962 r = unit_watch_pid(UNIT(s), pidref.pid, /* exclusive= */ true);
1963 if (r < 0)
1964 return r;
1965
1966 *ret_pid = TAKE_PIDREF(pidref);
1967 return 0;
1968 }
1969
1970 static int socket_chown(Socket *s, PidRef *ret_pid) {
1971 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1972 pid_t pid;
1973 int r;
1974
1975 assert(s);
1976
1977 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1978 if (r < 0)
1979 return r;
1980
1981 /* We have to resolve the user names out-of-process, hence
1982 * let's fork here. It's messy, but well, what can we do? */
1983
1984 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1985 if (r < 0)
1986 return r;
1987 if (r == 0) {
1988 uid_t uid = UID_INVALID;
1989 gid_t gid = GID_INVALID;
1990
1991 /* Child */
1992
1993 if (!isempty(s->user)) {
1994 const char *user = s->user;
1995
1996 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1997 if (r < 0) {
1998 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1999 _exit(EXIT_USER);
2000 }
2001 }
2002
2003 if (!isempty(s->group)) {
2004 const char *group = s->group;
2005
2006 r = get_group_creds(&group, &gid, 0);
2007 if (r < 0) {
2008 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2009 _exit(EXIT_GROUP);
2010 }
2011 }
2012
2013 LIST_FOREACH(port, p, s->ports) {
2014 const char *path = NULL;
2015
2016 if (p->type == SOCKET_SOCKET)
2017 path = socket_address_get_path(&p->address);
2018 else if (p->type == SOCKET_FIFO)
2019 path = p->path;
2020
2021 if (!path)
2022 continue;
2023
2024 if (chown(path, uid, gid) < 0) {
2025 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2026 _exit(EXIT_CHOWN);
2027 }
2028 }
2029
2030 _exit(EXIT_SUCCESS);
2031 }
2032
2033 r = pidref_set_pid(&pidref, pid);
2034 if (r < 0)
2035 return r;
2036
2037 r = unit_watch_pid(UNIT(s), pidref.pid, /* exclusive= */ true);
2038 if (r < 0)
2039 return r;
2040
2041 *ret_pid = TAKE_PIDREF(pidref);
2042 return 0;
2043 }
2044
2045 static void socket_enter_dead(Socket *s, SocketResult f) {
2046 assert(s);
2047
2048 if (s->result == SOCKET_SUCCESS)
2049 s->result = f;
2050
2051 if (s->result == SOCKET_SUCCESS)
2052 unit_log_success(UNIT(s));
2053 else
2054 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2055
2056 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2057
2058 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2059
2060 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2061
2062 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2063
2064 unit_unref_uid_gid(UNIT(s), true);
2065 }
2066
2067 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2068
2069 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2070 int r;
2071 assert(s);
2072
2073 if (s->result == SOCKET_SUCCESS)
2074 s->result = f;
2075
2076 socket_unwatch_control_pid(s);
2077 s->control_command_id = SOCKET_EXEC_STOP_POST;
2078 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2079
2080 if (s->control_command) {
2081 pidref_done(&s->control_pid);
2082
2083 r = socket_spawn(s, s->control_command, &s->control_pid);
2084 if (r < 0)
2085 goto fail;
2086
2087 socket_set_state(s, SOCKET_STOP_POST);
2088 } else
2089 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2090
2091 return;
2092
2093 fail:
2094 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2095 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2096 }
2097
2098 static int state_to_kill_operation(Socket *s, SocketState state) {
2099 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2100 return KILL_RESTART;
2101
2102 if (state == SOCKET_FINAL_SIGTERM)
2103 return KILL_TERMINATE;
2104
2105 return KILL_KILL;
2106 }
2107
2108 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2109 int r;
2110
2111 assert(s);
2112
2113 if (s->result == SOCKET_SUCCESS)
2114 s->result = f;
2115
2116 r = unit_kill_context(
2117 UNIT(s),
2118 &s->kill_context,
2119 state_to_kill_operation(s, state),
2120 -1,
2121 s->control_pid.pid,
2122 false);
2123 if (r < 0)
2124 goto fail;
2125
2126 if (r > 0) {
2127 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2128 if (r < 0)
2129 goto fail;
2130
2131 socket_set_state(s, state);
2132 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2133 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2134 else if (state == SOCKET_STOP_PRE_SIGKILL)
2135 socket_enter_stop_post(s, SOCKET_SUCCESS);
2136 else if (state == SOCKET_FINAL_SIGTERM)
2137 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2138 else
2139 socket_enter_dead(s, SOCKET_SUCCESS);
2140
2141 return;
2142
2143 fail:
2144 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2145
2146 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2147 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2148 else
2149 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2150 }
2151
2152 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2153 int r;
2154 assert(s);
2155
2156 if (s->result == SOCKET_SUCCESS)
2157 s->result = f;
2158
2159 socket_unwatch_control_pid(s);
2160 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2161 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2162
2163 if (s->control_command) {
2164 pidref_done(&s->control_pid);
2165
2166 r = socket_spawn(s, s->control_command, &s->control_pid);
2167 if (r < 0)
2168 goto fail;
2169
2170 socket_set_state(s, SOCKET_STOP_PRE);
2171 } else
2172 socket_enter_stop_post(s, SOCKET_SUCCESS);
2173
2174 return;
2175
2176 fail:
2177 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2178 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2179 }
2180
2181 static void socket_enter_listening(Socket *s) {
2182 int r;
2183 assert(s);
2184
2185 if (!s->accept && s->flush_pending) {
2186 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2187 flush_ports(s);
2188 }
2189
2190 r = socket_watch_fds(s);
2191 if (r < 0) {
2192 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2193 goto fail;
2194 }
2195
2196 socket_set_state(s, SOCKET_LISTENING);
2197 return;
2198
2199 fail:
2200 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2201 }
2202
2203 static void socket_enter_start_post(Socket *s) {
2204 int r;
2205 assert(s);
2206
2207 socket_unwatch_control_pid(s);
2208 s->control_command_id = SOCKET_EXEC_START_POST;
2209 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2210
2211 if (s->control_command) {
2212 pidref_done(&s->control_pid);
2213
2214 r = socket_spawn(s, s->control_command, &s->control_pid);
2215 if (r < 0) {
2216 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2217 goto fail;
2218 }
2219
2220 socket_set_state(s, SOCKET_START_POST);
2221 } else
2222 socket_enter_listening(s);
2223
2224 return;
2225
2226 fail:
2227 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2228 }
2229
2230 static void socket_enter_start_chown(Socket *s) {
2231 int r;
2232
2233 assert(s);
2234
2235 r = socket_open_fds(s);
2236 if (r < 0) {
2237 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2238 goto fail;
2239 }
2240
2241 if (!isempty(s->user) || !isempty(s->group)) {
2242
2243 socket_unwatch_control_pid(s);
2244 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2245 s->control_command = NULL;
2246
2247 r = socket_chown(s, &s->control_pid);
2248 if (r < 0) {
2249 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2250 goto fail;
2251 }
2252
2253 socket_set_state(s, SOCKET_START_CHOWN);
2254 } else
2255 socket_enter_start_post(s);
2256
2257 return;
2258
2259 fail:
2260 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2261 }
2262
2263 static void socket_enter_start_pre(Socket *s) {
2264 int r;
2265 assert(s);
2266
2267 socket_unwatch_control_pid(s);
2268
2269 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2270
2271 s->control_command_id = SOCKET_EXEC_START_PRE;
2272 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2273
2274 if (s->control_command) {
2275 pidref_done(&s->control_pid);
2276
2277 r = socket_spawn(s, s->control_command, &s->control_pid);
2278 if (r < 0) {
2279 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2280 goto fail;
2281 }
2282
2283 socket_set_state(s, SOCKET_START_PRE);
2284 } else
2285 socket_enter_start_chown(s);
2286
2287 return;
2288
2289 fail:
2290 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2291 }
2292
2293 static void flush_ports(Socket *s) {
2294 assert(s);
2295
2296 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2297 * anymore */
2298
2299 LIST_FOREACH(port, p, s->ports) {
2300 if (p->fd < 0)
2301 continue;
2302
2303 (void) flush_accept(p->fd);
2304 (void) flush_fd(p->fd);
2305 }
2306 }
2307
2308 static void socket_enter_running(Socket *s, int cfd_in) {
2309 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2310 * somewhere or close it. */
2311 _cleanup_close_ int cfd = cfd_in;
2312
2313 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2314 int r;
2315
2316 assert(s);
2317
2318 /* We don't take connections anymore if we are supposed to shut down anyway */
2319 if (unit_stop_pending(UNIT(s))) {
2320
2321 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2322
2323 if (cfd >= 0)
2324 goto refuse;
2325
2326 flush_ports(s);
2327 return;
2328 }
2329
2330 if (!ratelimit_below(&s->trigger_limit)) {
2331 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2332 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2333 goto refuse;
2334 }
2335
2336 if (cfd < 0) {
2337 bool pending = false;
2338 Unit *other;
2339
2340 /* If there's already a start pending don't bother to do anything */
2341 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2342 if (unit_active_or_pending(other)) {
2343 pending = true;
2344 break;
2345 }
2346
2347 if (!pending) {
2348 if (!UNIT_ISSET(s->service)) {
2349 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2350 "Service to activate vanished, refusing activation.");
2351 goto fail;
2352 }
2353
2354 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2355 if (r < 0)
2356 goto fail;
2357 }
2358
2359 socket_set_state(s, SOCKET_RUNNING);
2360 } else {
2361 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2362 Unit *service;
2363
2364 if (s->n_connections >= s->max_connections) {
2365 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2366 s->n_connections);
2367 goto refuse;
2368 }
2369
2370 if (s->max_connections_per_source > 0) {
2371 r = socket_acquire_peer(s, cfd, &p);
2372 if (r < 0) {
2373 if (ERRNO_IS_DISCONNECT(r))
2374 return;
2375 /* We didn't have enough resources to acquire peer information, let's fail. */
2376 goto fail;
2377 }
2378 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2379 _cleanup_free_ char *t = NULL;
2380
2381 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2382
2383 log_unit_warning(UNIT(s),
2384 "Too many incoming connections (%u) from source %s, dropping connection.",
2385 p->n_ref, strnull(t));
2386 goto refuse;
2387 }
2388 }
2389
2390 r = socket_load_service_unit(s, cfd, &service);
2391 if (r < 0) {
2392 if (ERRNO_IS_DISCONNECT(r))
2393 return;
2394 goto fail;
2395 }
2396
2397 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2398 false, UNIT_DEPENDENCY_IMPLICIT);
2399 if (r < 0)
2400 goto fail;
2401
2402 s->n_accepted++;
2403
2404 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2405 if (r < 0) {
2406 if (ERRNO_IS_DISCONNECT(r))
2407 return;
2408 goto fail;
2409 }
2410
2411 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2412 s->n_connections++;
2413
2414 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2415 if (r < 0) {
2416 /* We failed to activate the new service, but it still exists. Let's make sure the
2417 * service closes and forgets the connection fd again, immediately. */
2418 service_release_socket_fd(SERVICE(service));
2419 goto fail;
2420 }
2421
2422 /* Notify clients about changed counters */
2423 unit_add_to_dbus_queue(UNIT(s));
2424 }
2425
2426 TAKE_FD(cfd);
2427 return;
2428
2429 refuse:
2430 s->n_refused++;
2431 return;
2432
2433 fail:
2434 if (ERRNO_IS_RESOURCE(r))
2435 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2436 bus_error_message(&error, r));
2437 else
2438 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2439 cfd >= 0 ? "template" : "non-template",
2440 bus_error_message(&error, r));
2441
2442 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2443 }
2444
2445 static void socket_run_next(Socket *s) {
2446 int r;
2447
2448 assert(s);
2449 assert(s->control_command);
2450 assert(s->control_command->command_next);
2451
2452 socket_unwatch_control_pid(s);
2453
2454 s->control_command = s->control_command->command_next;
2455
2456 pidref_done(&s->control_pid);
2457
2458 r = socket_spawn(s, s->control_command, &s->control_pid);
2459 if (r < 0)
2460 goto fail;
2461
2462 return;
2463
2464 fail:
2465 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2466
2467 if (s->state == SOCKET_START_POST)
2468 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2469 else if (s->state == SOCKET_STOP_POST)
2470 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2471 else
2472 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2473 }
2474
2475 static int socket_start(Unit *u) {
2476 Socket *s = SOCKET(u);
2477 int r;
2478
2479 assert(s);
2480
2481 /* We cannot fulfill this request right now, try again later
2482 * please! */
2483 if (IN_SET(s->state,
2484 SOCKET_STOP_PRE,
2485 SOCKET_STOP_PRE_SIGKILL,
2486 SOCKET_STOP_PRE_SIGTERM,
2487 SOCKET_STOP_POST,
2488 SOCKET_FINAL_SIGTERM,
2489 SOCKET_FINAL_SIGKILL,
2490 SOCKET_CLEANING))
2491 return -EAGAIN;
2492
2493 /* Already on it! */
2494 if (IN_SET(s->state,
2495 SOCKET_START_PRE,
2496 SOCKET_START_CHOWN,
2497 SOCKET_START_POST))
2498 return 0;
2499
2500 /* Cannot run this without the service being around */
2501 if (UNIT_ISSET(s->service)) {
2502 Service *service;
2503
2504 service = SERVICE(UNIT_DEREF(s->service));
2505
2506 if (UNIT(service)->load_state != UNIT_LOADED)
2507 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT),
2508 "Socket service %s not loaded, refusing.", UNIT(service)->id);
2509
2510 /* If the service is already active we cannot start the
2511 * socket */
2512 if (!IN_SET(service->state,
2513 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
2514 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
2515 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY),
2516 "Socket service %s already active, refusing.", UNIT(service)->id);
2517 }
2518
2519 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2520
2521 r = unit_acquire_invocation_id(u);
2522 if (r < 0)
2523 return r;
2524
2525 s->result = SOCKET_SUCCESS;
2526 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2527
2528 u->reset_accounting = true;
2529
2530 socket_enter_start_pre(s);
2531 return 1;
2532 }
2533
2534 static int socket_stop(Unit *u) {
2535 Socket *s = SOCKET(u);
2536
2537 assert(s);
2538
2539 /* Already on it */
2540 if (IN_SET(s->state,
2541 SOCKET_STOP_PRE,
2542 SOCKET_STOP_PRE_SIGTERM,
2543 SOCKET_STOP_PRE_SIGKILL,
2544 SOCKET_STOP_POST,
2545 SOCKET_FINAL_SIGTERM,
2546 SOCKET_FINAL_SIGKILL))
2547 return 0;
2548
2549 /* If there's already something running we go directly into
2550 * kill mode. */
2551 if (IN_SET(s->state,
2552 SOCKET_START_PRE,
2553 SOCKET_START_CHOWN,
2554 SOCKET_START_POST)) {
2555 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2556 return -EAGAIN;
2557 }
2558
2559 /* If we are currently cleaning, then abort it, brutally. */
2560 if (s->state == SOCKET_CLEANING) {
2561 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2562 return 0;
2563 }
2564
2565 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2566
2567 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2568 return 1;
2569 }
2570
2571 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2572 Socket *s = SOCKET(u);
2573 int r;
2574
2575 assert(u);
2576 assert(f);
2577 assert(fds);
2578
2579 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2580 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2581 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2582 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2583
2584 if (pidref_is_set(&s->control_pid))
2585 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid.pid);
2586
2587 if (s->control_command_id >= 0)
2588 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2589
2590 LIST_FOREACH(port, p, s->ports) {
2591 int copy;
2592
2593 if (p->fd < 0)
2594 continue;
2595
2596 copy = fdset_put_dup(fds, p->fd);
2597 if (copy < 0)
2598 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2599
2600 if (p->type == SOCKET_SOCKET) {
2601 _cleanup_free_ char *t = NULL;
2602
2603 r = socket_address_print(&p->address, &t);
2604 if (r < 0)
2605 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2606
2607 if (socket_address_family(&p->address) == AF_NETLINK)
2608 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2609 else
2610 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2611 } else if (p->type == SOCKET_SPECIAL)
2612 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2613 else if (p->type == SOCKET_MQUEUE)
2614 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2615 else if (p->type == SOCKET_USB_FUNCTION)
2616 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2617 else {
2618 assert(p->type == SOCKET_FIFO);
2619 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2620 }
2621 }
2622
2623 return 0;
2624 }
2625
2626 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2627 Socket *s = SOCKET(u);
2628 int r;
2629
2630 assert(u);
2631 assert(key);
2632 assert(value);
2633
2634 if (streq(key, "state")) {
2635 SocketState state;
2636
2637 state = socket_state_from_string(value);
2638 if (state < 0)
2639 log_unit_debug(u, "Failed to parse state value: %s", value);
2640 else
2641 s->deserialized_state = state;
2642 } else if (streq(key, "result")) {
2643 SocketResult f;
2644
2645 f = socket_result_from_string(value);
2646 if (f < 0)
2647 log_unit_debug(u, "Failed to parse result value: %s", value);
2648 else if (f != SOCKET_SUCCESS)
2649 s->result = f;
2650
2651 } else if (streq(key, "n-accepted")) {
2652 unsigned k;
2653
2654 if (safe_atou(value, &k) < 0)
2655 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2656 else
2657 s->n_accepted += k;
2658 } else if (streq(key, "n-refused")) {
2659 unsigned k;
2660
2661 if (safe_atou(value, &k) < 0)
2662 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2663 else
2664 s->n_refused += k;
2665 } else if (streq(key, "control-pid")) {
2666 pidref_done(&s->control_pid);
2667 r = pidref_set_pidstr(&s->control_pid, value);
2668 if (r < 0)
2669 log_debug_errno(r, "Failed to pin control PID '%s', ignoring: %m", value);
2670 } else if (streq(key, "control-command")) {
2671 SocketExecCommand id;
2672
2673 id = socket_exec_command_from_string(value);
2674 if (id < 0)
2675 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2676 else {
2677 s->control_command_id = id;
2678 s->control_command = s->exec_command[id];
2679 }
2680 } else if (streq(key, "fifo")) {
2681 _cleanup_free_ char *fdv = NULL;
2682 bool found = false;
2683 int fd;
2684
2685 r = extract_first_word(&value, &fdv, NULL, 0);
2686 if (r <= 0) {
2687 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2688 return 0;
2689 }
2690
2691 fd = parse_fd(fdv);
2692 if (fd < 0 || !fdset_contains(fds, fd)) {
2693 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2694 return 0;
2695 }
2696
2697 LIST_FOREACH(port, p, s->ports)
2698 if (p->fd < 0 &&
2699 p->type == SOCKET_FIFO &&
2700 path_equal_or_inode_same(p->path, value, 0)) {
2701 p->fd = fdset_remove(fds, fd);
2702 found = true;
2703 break;
2704 }
2705 if (!found)
2706 log_unit_debug(u, "No matching fifo socket found: %s", value);
2707
2708 } else if (streq(key, "special")) {
2709 _cleanup_free_ char *fdv = NULL;
2710 bool found = false;
2711 int fd;
2712
2713 r = extract_first_word(&value, &fdv, NULL, 0);
2714 if (r <= 0) {
2715 log_unit_debug(u, "Failed to parse special value: %s", value);
2716 return 0;
2717 }
2718
2719 fd = parse_fd(fdv);
2720 if (fd < 0 || !fdset_contains(fds, fd)) {
2721 log_unit_debug(u, "Invalid special value: %s", fdv);
2722 return 0;
2723 }
2724
2725 LIST_FOREACH(port, p, s->ports)
2726 if (p->fd < 0 &&
2727 p->type == SOCKET_SPECIAL &&
2728 path_equal_or_inode_same(p->path, value, 0)) {
2729 p->fd = fdset_remove(fds, fd);
2730 found = true;
2731 break;
2732 }
2733 if (!found)
2734 log_unit_debug(u, "No matching special socket found: %s", value);
2735
2736 } else if (streq(key, "mqueue")) {
2737 _cleanup_free_ char *fdv = NULL;
2738 bool found = false;
2739 int fd;
2740
2741 r = extract_first_word(&value, &fdv, NULL, 0);
2742 if (r <= 0) {
2743 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2744 return 0;
2745 }
2746
2747 fd = parse_fd(fdv);
2748 if (fd < 0 || !fdset_contains(fds, fd)) {
2749 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2750 return 0;
2751 }
2752
2753 LIST_FOREACH(port, p, s->ports)
2754 if (p->fd < 0 &&
2755 p->type == SOCKET_MQUEUE &&
2756 streq(p->path, value)) {
2757 p->fd = fdset_remove(fds, fd);
2758 found = true;
2759 break;
2760 }
2761 if (!found)
2762 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2763
2764 } else if (streq(key, "socket")) {
2765 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2766 bool found = false;
2767 int fd, type;
2768
2769 r = extract_first_word(&value, &fdv, NULL, 0);
2770 if (r <= 0) {
2771 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2772 return 0;
2773 }
2774
2775 fd = parse_fd(fdv);
2776 if (fd < 0 || !fdset_contains(fds, fd)) {
2777 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2778 return 0;
2779 }
2780
2781 r = extract_first_word(&value, &typev, NULL, 0);
2782 if (r <= 0) {
2783 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2784 return 0;
2785 }
2786
2787 if (safe_atoi(typev, &type) < 0 || type < 0) {
2788 log_unit_debug(u, "Invalid socket type: %s", typev);
2789 return 0;
2790 }
2791
2792 LIST_FOREACH(port, p, s->ports)
2793 if (p->fd < 0 &&
2794 socket_address_is(&p->address, value, type)) {
2795 p->fd = fdset_remove(fds, fd);
2796 found = true;
2797 break;
2798 }
2799 if (!found)
2800 log_unit_debug(u, "No matching %s socket found: %s",
2801 socket_address_type_to_string(type), value);
2802
2803 } else if (streq(key, "netlink")) {
2804 _cleanup_free_ char *fdv = NULL;
2805 bool found = false;
2806 int fd;
2807
2808 r = extract_first_word(&value, &fdv, NULL, 0);
2809 if (r <= 0) {
2810 log_unit_debug(u, "Failed to parse socket value: %s", value);
2811 return 0;
2812 }
2813
2814 fd = parse_fd(fdv);
2815 if (fd < 0 || !fdset_contains(fds, fd)) {
2816 log_unit_debug(u, "Invalid socket value: %s", fdv);
2817 return 0;
2818 }
2819
2820 LIST_FOREACH(port, p, s->ports)
2821 if (p->fd < 0 &&
2822 socket_address_is_netlink(&p->address, value)) {
2823 p->fd = fdset_remove(fds, fd);
2824 found = true;
2825 break;
2826 }
2827 if (!found)
2828 log_unit_debug(u, "No matching netlink socket found: %s", value);
2829
2830 } else if (streq(key, "ffs")) {
2831 _cleanup_free_ char *fdv = NULL;
2832 bool found = false;
2833 int fd;
2834
2835 r = extract_first_word(&value, &fdv, NULL, 0);
2836 if (r <= 0) {
2837 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2838 return 0;
2839 }
2840
2841 fd = parse_fd(fdv);
2842 if (fd < 0 || !fdset_contains(fds, fd)) {
2843 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2844 return 0;
2845 }
2846
2847 LIST_FOREACH(port, p, s->ports)
2848 if (p->fd < 0 &&
2849 p->type == SOCKET_USB_FUNCTION &&
2850 path_equal_or_inode_same(p->path, value, 0)) {
2851 p->fd = fdset_remove(fds, fd);
2852 found = true;
2853 break;
2854 }
2855 if (!found)
2856 log_unit_debug(u, "No matching ffs socket found: %s", value);
2857
2858 } else
2859 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2860
2861 return 0;
2862 }
2863
2864 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2865 Socket *s = SOCKET(u);
2866
2867 assert(u);
2868
2869 LIST_FOREACH(port, p, s->ports) {
2870 int fd;
2871
2872 if (p->type != SOCKET_SOCKET)
2873 continue;
2874
2875 if (p->fd >= 0)
2876 continue;
2877
2878 FDSET_FOREACH(fd, fds) {
2879 if (socket_address_matches_fd(&p->address, fd)) {
2880 p->fd = fdset_remove(fds, fd);
2881 s->deserialized_state = SOCKET_LISTENING;
2882 break;
2883 }
2884 }
2885 }
2886 }
2887
2888 static UnitActiveState socket_active_state(Unit *u) {
2889 assert(u);
2890
2891 return state_translation_table[SOCKET(u)->state];
2892 }
2893
2894 static const char *socket_sub_state_to_string(Unit *u) {
2895 assert(u);
2896
2897 return socket_state_to_string(SOCKET(u)->state);
2898 }
2899
2900 const char* socket_port_type_to_string(SocketPort *p) {
2901
2902 assert(p);
2903
2904 switch (p->type) {
2905
2906 case SOCKET_SOCKET:
2907
2908 switch (p->address.type) {
2909
2910 case SOCK_STREAM:
2911 return "Stream";
2912
2913 case SOCK_DGRAM:
2914 return "Datagram";
2915
2916 case SOCK_SEQPACKET:
2917 return "SequentialPacket";
2918
2919 case SOCK_RAW:
2920 if (socket_address_family(&p->address) == AF_NETLINK)
2921 return "Netlink";
2922
2923 _fallthrough_;
2924 default:
2925 return NULL;
2926 }
2927
2928 case SOCKET_SPECIAL:
2929 return "Special";
2930
2931 case SOCKET_MQUEUE:
2932 return "MessageQueue";
2933
2934 case SOCKET_FIFO:
2935 return "FIFO";
2936
2937 case SOCKET_USB_FUNCTION:
2938 return "USBFunction";
2939
2940 default:
2941 return NULL;
2942 }
2943 }
2944
2945 SocketType socket_port_type_from_string(const char *s) {
2946 assert(s);
2947
2948 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2949 return SOCKET_SOCKET;
2950 else if (streq(s, "Special"))
2951 return SOCKET_SPECIAL;
2952 else if (streq(s, "MessageQueue"))
2953 return SOCKET_MQUEUE;
2954 else if (streq(s, "FIFO"))
2955 return SOCKET_FIFO;
2956 else if (streq(s, "USBFunction"))
2957 return SOCKET_USB_FUNCTION;
2958 else
2959 return _SOCKET_TYPE_INVALID;
2960 }
2961
2962 static bool socket_may_gc(Unit *u) {
2963 Socket *s = SOCKET(u);
2964
2965 assert(u);
2966
2967 return s->n_connections == 0;
2968 }
2969
2970 static int socket_accept_do(Socket *s, int fd) {
2971 int cfd;
2972
2973 assert(s);
2974 assert(fd >= 0);
2975
2976 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2977 if (cfd < 0)
2978 /* Convert transient network errors into clean and well-defined EAGAIN */
2979 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2980
2981 return cfd;
2982 }
2983
2984 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2985 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2986 int cfd, r;
2987 pid_t pid;
2988
2989 assert(s);
2990 assert(p);
2991 assert(fd >= 0);
2992
2993 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2994 * connection socket is also properly associated with the cgroup. */
2995
2996 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2997 goto shortcut;
2998
2999 r = bpf_firewall_supported();
3000 if (r < 0)
3001 return r;
3002 if (r == BPF_FIREWALL_UNSUPPORTED)
3003 goto shortcut;
3004
3005 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
3006 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
3007
3008 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
3009 if (r < 0)
3010 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
3011 if (r == 0) {
3012 /* Child */
3013
3014 pair[0] = safe_close(pair[0]);
3015
3016 cfd = socket_accept_do(s, fd);
3017 if (cfd == -EAGAIN) /* spurious accept() */
3018 _exit(EXIT_SUCCESS);
3019 if (cfd < 0) {
3020 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3021 _exit(EXIT_FAILURE);
3022 }
3023
3024 r = send_one_fd(pair[1], cfd, 0);
3025 if (r < 0) {
3026 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3027 _exit(EXIT_FAILURE);
3028 }
3029
3030 _exit(EXIT_SUCCESS);
3031 }
3032
3033 pair[1] = safe_close(pair[1]);
3034 cfd = receive_one_fd(pair[0], 0);
3035
3036 /* We synchronously wait for the helper, as it shouldn't be slow */
3037 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3038 if (r < 0) {
3039 safe_close(cfd);
3040 return r;
3041 }
3042
3043 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3044 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3045 if (cfd == -EIO)
3046 return -EAGAIN;
3047 if (cfd < 0)
3048 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3049
3050 return cfd;
3051
3052 shortcut:
3053 cfd = socket_accept_do(s, fd);
3054 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3055 return -EAGAIN;
3056 if (cfd < 0)
3057 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3058
3059 return cfd;
3060 }
3061
3062 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3063 SocketPort *p = ASSERT_PTR(userdata);
3064 int cfd = -EBADF;
3065
3066 assert(fd >= 0);
3067
3068 if (p->socket->state != SOCKET_LISTENING)
3069 return 0;
3070
3071 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3072
3073 if (revents != EPOLLIN) {
3074 if (revents & EPOLLHUP)
3075 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.");
3076 else
3077 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3078 goto fail;
3079 }
3080
3081 if (p->socket->accept &&
3082 p->type == SOCKET_SOCKET &&
3083 socket_address_can_accept(&p->address)) {
3084
3085 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3086 if (cfd == -EAGAIN) /* Spurious accept() */
3087 return 0;
3088 if (cfd < 0)
3089 goto fail;
3090
3091 socket_apply_socket_options(p->socket, p, cfd);
3092 }
3093
3094 socket_enter_running(p->socket, cfd);
3095 return 0;
3096
3097 fail:
3098 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3099 return 0;
3100 }
3101
3102 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3103 Socket *s = SOCKET(u);
3104 SocketResult f;
3105
3106 assert(s);
3107 assert(pid >= 0);
3108
3109 if (pid != s->control_pid.pid)
3110 return;
3111
3112 pidref_done(&s->control_pid);
3113
3114 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3115 f = SOCKET_SUCCESS;
3116 else if (code == CLD_EXITED)
3117 f = SOCKET_FAILURE_EXIT_CODE;
3118 else if (code == CLD_KILLED)
3119 f = SOCKET_FAILURE_SIGNAL;
3120 else if (code == CLD_DUMPED)
3121 f = SOCKET_FAILURE_CORE_DUMP;
3122 else
3123 assert_not_reached();
3124
3125 if (s->control_command) {
3126 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3127
3128 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3129 f = SOCKET_SUCCESS;
3130 }
3131
3132 unit_log_process_exit(
3133 u,
3134 "Control process",
3135 socket_exec_command_to_string(s->control_command_id),
3136 f == SOCKET_SUCCESS,
3137 code, status);
3138
3139 if (s->result == SOCKET_SUCCESS)
3140 s->result = f;
3141
3142 if (s->control_command &&
3143 s->control_command->command_next &&
3144 f == SOCKET_SUCCESS) {
3145
3146 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3147 socket_run_next(s);
3148 } else {
3149 s->control_command = NULL;
3150 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3151
3152 /* No further commands for this step, so let's figure
3153 * out what to do next */
3154
3155 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3156
3157 switch (s->state) {
3158
3159 case SOCKET_START_PRE:
3160 if (f == SOCKET_SUCCESS)
3161 socket_enter_start_chown(s);
3162 else
3163 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3164 break;
3165
3166 case SOCKET_START_CHOWN:
3167 if (f == SOCKET_SUCCESS)
3168 socket_enter_start_post(s);
3169 else
3170 socket_enter_stop_pre(s, f);
3171 break;
3172
3173 case SOCKET_START_POST:
3174 if (f == SOCKET_SUCCESS)
3175 socket_enter_listening(s);
3176 else
3177 socket_enter_stop_pre(s, f);
3178 break;
3179
3180 case SOCKET_STOP_PRE:
3181 case SOCKET_STOP_PRE_SIGTERM:
3182 case SOCKET_STOP_PRE_SIGKILL:
3183 socket_enter_stop_post(s, f);
3184 break;
3185
3186 case SOCKET_STOP_POST:
3187 case SOCKET_FINAL_SIGTERM:
3188 case SOCKET_FINAL_SIGKILL:
3189 socket_enter_dead(s, f);
3190 break;
3191
3192 case SOCKET_CLEANING:
3193
3194 if (s->clean_result == SOCKET_SUCCESS)
3195 s->clean_result = f;
3196
3197 socket_enter_dead(s, SOCKET_SUCCESS);
3198 break;
3199
3200 default:
3201 assert_not_reached();
3202 }
3203 }
3204
3205 /* Notify clients about changed exit status */
3206 unit_add_to_dbus_queue(u);
3207 }
3208
3209 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3210 Socket *s = SOCKET(userdata);
3211
3212 assert(s);
3213 assert(s->timer_event_source == source);
3214
3215 switch (s->state) {
3216
3217 case SOCKET_START_PRE:
3218 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3219 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3220 break;
3221
3222 case SOCKET_START_CHOWN:
3223 case SOCKET_START_POST:
3224 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3225 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3226 break;
3227
3228 case SOCKET_STOP_PRE:
3229 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3230 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3231 break;
3232
3233 case SOCKET_STOP_PRE_SIGTERM:
3234 if (s->kill_context.send_sigkill) {
3235 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3236 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3237 } else {
3238 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3239 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3240 }
3241 break;
3242
3243 case SOCKET_STOP_PRE_SIGKILL:
3244 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3245 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3246 break;
3247
3248 case SOCKET_STOP_POST:
3249 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3250 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3251 break;
3252
3253 case SOCKET_FINAL_SIGTERM:
3254 if (s->kill_context.send_sigkill) {
3255 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3256 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3257 } else {
3258 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3259 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3260 }
3261 break;
3262
3263 case SOCKET_FINAL_SIGKILL:
3264 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3265 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3266 break;
3267
3268 case SOCKET_CLEANING:
3269 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3270
3271 if (s->clean_result == SOCKET_SUCCESS)
3272 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3273
3274 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3275 break;
3276
3277 default:
3278 assert_not_reached();
3279 }
3280
3281 return 0;
3282 }
3283
3284 int socket_collect_fds(Socket *s, int **fds) {
3285 size_t k = 0, n = 0;
3286 int *rfds;
3287
3288 assert(s);
3289 assert(fds);
3290
3291 /* Called from the service code for requesting our fds */
3292
3293 LIST_FOREACH(port, p, s->ports) {
3294 if (p->fd >= 0)
3295 n++;
3296 n += p->n_auxiliary_fds;
3297 }
3298
3299 if (n <= 0) {
3300 *fds = NULL;
3301 return 0;
3302 }
3303
3304 rfds = new(int, n);
3305 if (!rfds)
3306 return -ENOMEM;
3307
3308 LIST_FOREACH(port, p, s->ports) {
3309 if (p->fd >= 0)
3310 rfds[k++] = p->fd;
3311 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3312 rfds[k++] = p->auxiliary_fds[i];
3313 }
3314
3315 assert(k == n);
3316
3317 *fds = rfds;
3318 return (int) n;
3319 }
3320
3321 static void socket_reset_failed(Unit *u) {
3322 Socket *s = SOCKET(u);
3323
3324 assert(s);
3325
3326 if (s->state == SOCKET_FAILED)
3327 socket_set_state(s, SOCKET_DEAD);
3328
3329 s->result = SOCKET_SUCCESS;
3330 s->clean_result = SOCKET_SUCCESS;
3331 }
3332
3333 void socket_connection_unref(Socket *s) {
3334 assert(s);
3335
3336 /* The service is dead. Yay!
3337 *
3338 * This is strictly for one-instance-per-connection
3339 * services. */
3340
3341 assert(s->n_connections > 0);
3342 s->n_connections--;
3343
3344 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3345 }
3346
3347 static void socket_trigger_notify(Unit *u, Unit *other) {
3348 Socket *s = SOCKET(u);
3349
3350 assert(u);
3351 assert(other);
3352
3353 /* Filter out invocations with bogus state */
3354 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3355 assert(other->type == UNIT_SERVICE);
3356
3357 /* Don't propagate state changes from the service if we are already down */
3358 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3359 return;
3360
3361 /* We don't care for the service state if we are in Accept=yes mode */
3362 if (s->accept)
3363 return;
3364
3365 /* Propagate start limit hit state */
3366 if (other->start_limit_hit) {
3367 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3368 return;
3369 }
3370
3371 /* Don't propagate anything if there's still a job queued */
3372 if (other->job)
3373 return;
3374
3375 if (IN_SET(SERVICE(other)->state,
3376 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3377 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3378 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
3379 socket_enter_listening(s);
3380
3381 if (SERVICE(other)->state == SERVICE_RUNNING)
3382 socket_set_state(s, SOCKET_RUNNING);
3383 }
3384
3385 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3386 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid.pid, error);
3387 }
3388
3389 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3390 Socket *s = SOCKET(u);
3391 usec_t t;
3392 int r;
3393
3394 if (!s->timer_event_source)
3395 return 0;
3396
3397 r = sd_event_source_get_time(s->timer_event_source, &t);
3398 if (r < 0)
3399 return r;
3400 if (t == USEC_INFINITY)
3401 return 0;
3402
3403 *timeout = t;
3404 return 1;
3405 }
3406
3407 char *socket_fdname(Socket *s) {
3408 assert(s);
3409
3410 /* Returns the name to use for $LISTEN_NAMES. If the user
3411 * didn't specify anything specifically, use the socket unit's
3412 * name as fallback. */
3413
3414 return s->fdname ?: UNIT(s)->id;
3415 }
3416
3417 static int socket_control_pid(Unit *u) {
3418 Socket *s = SOCKET(u);
3419
3420 assert(s);
3421
3422 return s->control_pid.pid;
3423 }
3424
3425 static int socket_clean(Unit *u, ExecCleanMask mask) {
3426 _cleanup_strv_free_ char **l = NULL;
3427 Socket *s = SOCKET(u);
3428 pid_t pid;
3429 int r;
3430
3431 assert(s);
3432 assert(mask != 0);
3433
3434 if (s->state != SOCKET_DEAD)
3435 return -EBUSY;
3436
3437 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3438 if (r < 0)
3439 return r;
3440
3441 if (strv_isempty(l))
3442 return -EUNATCH;
3443
3444 socket_unwatch_control_pid(s);
3445 s->clean_result = SOCKET_SUCCESS;
3446 s->control_command = NULL;
3447 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3448
3449 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3450 if (r < 0)
3451 goto fail;
3452
3453 r = unit_fork_and_watch_rm_rf(u, l, &pid);
3454 if (r < 0)
3455 goto fail;
3456
3457 r = pidref_set_pid(&s->control_pid, pid);
3458 if (r < 0)
3459 goto fail;
3460
3461 socket_set_state(s, SOCKET_CLEANING);
3462 return 0;
3463
3464 fail:
3465 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3466 s->clean_result = SOCKET_FAILURE_RESOURCES;
3467 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3468 return r;
3469 }
3470
3471 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3472 Socket *s = SOCKET(u);
3473
3474 assert(s);
3475
3476 return exec_context_get_clean_mask(&s->exec_context, ret);
3477 }
3478
3479 static int socket_can_start(Unit *u) {
3480 Socket *s = SOCKET(u);
3481 int r;
3482
3483 assert(s);
3484
3485 r = unit_test_start_limit(u);
3486 if (r < 0) {
3487 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3488 return r;
3489 }
3490
3491 return 1;
3492 }
3493
3494 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3495 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3496 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3497 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3498 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3499 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3500 };
3501
3502 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3503
3504 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3505 [SOCKET_SUCCESS] = "success",
3506 [SOCKET_FAILURE_RESOURCES] = "resources",
3507 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3508 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3509 [SOCKET_FAILURE_SIGNAL] = "signal",
3510 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3511 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3512 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3513 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3514 };
3515
3516 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3517
3518 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3519 [SOCKET_TIMESTAMPING_OFF] = "off",
3520 [SOCKET_TIMESTAMPING_US] = "us",
3521 [SOCKET_TIMESTAMPING_NS] = "ns",
3522 };
3523
3524 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3525
3526 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3527 SocketTimestamping t;
3528 int r;
3529
3530 if (!p)
3531 return _SOCKET_TIMESTAMPING_INVALID;
3532
3533 t = socket_timestamping_from_string(p);
3534 if (t >= 0)
3535 return t;
3536
3537 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3538 * too. */
3539 if (streq(p, "nsec"))
3540 return SOCKET_TIMESTAMPING_NS;
3541 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3542 return SOCKET_TIMESTAMPING_US;
3543
3544 r = parse_boolean(p);
3545 if (r < 0)
3546 return _SOCKET_TIMESTAMPING_INVALID;
3547
3548 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3549 }
3550
3551 const UnitVTable socket_vtable = {
3552 .object_size = sizeof(Socket),
3553 .exec_context_offset = offsetof(Socket, exec_context),
3554 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3555 .kill_context_offset = offsetof(Socket, kill_context),
3556 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3557
3558 .sections =
3559 "Unit\0"
3560 "Socket\0"
3561 "Install\0",
3562 .private_section = "Socket",
3563
3564 .can_transient = true,
3565 .can_trigger = true,
3566 .can_fail = true,
3567
3568 .init = socket_init,
3569 .done = socket_done,
3570 .load = socket_load,
3571
3572 .coldplug = socket_coldplug,
3573
3574 .dump = socket_dump,
3575
3576 .start = socket_start,
3577 .stop = socket_stop,
3578
3579 .kill = socket_kill,
3580 .clean = socket_clean,
3581 .can_clean = socket_can_clean,
3582
3583 .get_timeout = socket_get_timeout,
3584
3585 .serialize = socket_serialize,
3586 .deserialize_item = socket_deserialize_item,
3587 .distribute_fds = socket_distribute_fds,
3588
3589 .active_state = socket_active_state,
3590 .sub_state_to_string = socket_sub_state_to_string,
3591
3592 .will_restart = unit_will_restart_default,
3593
3594 .may_gc = socket_may_gc,
3595
3596 .sigchld_event = socket_sigchld_event,
3597
3598 .trigger_notify = socket_trigger_notify,
3599
3600 .reset_failed = socket_reset_failed,
3601
3602 .control_pid = socket_control_pid,
3603
3604 .bus_set_property = bus_socket_set_property,
3605 .bus_commit_properties = bus_socket_commit_properties,
3606
3607 .status_message_formats = {
3608 .finished_start_job = {
3609 [JOB_DONE] = "Listening on %s.",
3610 [JOB_FAILED] = "Failed to listen on %s.",
3611 [JOB_TIMEOUT] = "Timed out starting %s.",
3612 },
3613 .finished_stop_job = {
3614 [JOB_DONE] = "Closed %s.",
3615 [JOB_FAILED] = "Failed stopping %s.",
3616 [JOB_TIMEOUT] = "Timed out stopping %s.",
3617 },
3618 },
3619
3620 .can_start = socket_can_start,
3621 };
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