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Merge pull request #26541 from DaanDeMeyer/xfs-whitespace-fix
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase.h"
18 #include "constants.h"
19 #include "copy.h"
20 #include "dbus-socket.h"
21 #include "dbus-unit.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label-util.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN_DELUXE;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = UINT_MAX;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid));
113 }
114
115 static void socket_cleanup_fd_list(SocketPort *p) {
116 assert(p);
117
118 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
119 p->auxiliary_fds = mfree(p->auxiliary_fds);
120 p->n_auxiliary_fds = 0;
121 }
122
123 SocketPort *socket_port_free(SocketPort *p) {
124 if (!p)
125 return NULL;
126
127 sd_event_source_unref(p->event_source);
128
129 socket_cleanup_fd_list(p);
130 safe_close(p->fd);
131 free(p->path);
132
133 return mfree(p);
134 }
135
136 void socket_free_ports(Socket *s) {
137 SocketPort *p;
138
139 assert(s);
140
141 while ((p = s->ports)) {
142 LIST_REMOVE(port, s->ports, p);
143 socket_port_free(p);
144 }
145 }
146
147 static void socket_done(Unit *u) {
148 Socket *s = SOCKET(u);
149 SocketPeer *p;
150
151 assert(s);
152
153 socket_free_ports(s);
154
155 while ((p = set_steal_first(s->peers_by_address)))
156 p->socket = NULL;
157
158 s->peers_by_address = set_free(s->peers_by_address);
159
160 s->exec_runtime = exec_runtime_free(s->exec_runtime);
161 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
162 s->control_command = NULL;
163
164 socket_unwatch_control_pid(s);
165
166 unit_ref_unset(&s->service);
167
168 s->tcp_congestion = mfree(s->tcp_congestion);
169 s->bind_to_device = mfree(s->bind_to_device);
170
171 s->smack = mfree(s->smack);
172 s->smack_ip_in = mfree(s->smack_ip_in);
173 s->smack_ip_out = mfree(s->smack_ip_out);
174
175 strv_free(s->symlinks);
176
177 s->user = mfree(s->user);
178 s->group = mfree(s->group);
179
180 s->fdname = mfree(s->fdname);
181
182 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
183 }
184
185 static int socket_arm_timer(Socket *s, usec_t usec) {
186 int r;
187
188 assert(s);
189
190 if (s->timer_event_source) {
191 r = sd_event_source_set_time(s->timer_event_source, usec);
192 if (r < 0)
193 return r;
194
195 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
196 }
197
198 if (usec == USEC_INFINITY)
199 return 0;
200
201 r = sd_event_add_time(
202 UNIT(s)->manager->event,
203 &s->timer_event_source,
204 CLOCK_MONOTONIC,
205 usec, 0,
206 socket_dispatch_timer, s);
207 if (r < 0)
208 return r;
209
210 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
211
212 return 0;
213 }
214
215 static bool have_non_accept_socket(Socket *s) {
216 assert(s);
217
218 if (!s->accept)
219 return true;
220
221 LIST_FOREACH(port, p, s->ports) {
222
223 if (p->type != SOCKET_SOCKET)
224 return true;
225
226 if (!socket_address_can_accept(&p->address))
227 return true;
228 }
229
230 return false;
231 }
232
233 static int socket_add_mount_dependencies(Socket *s) {
234 int r;
235
236 assert(s);
237
238 LIST_FOREACH(port, p, s->ports) {
239 const char *path = NULL;
240
241 if (p->type == SOCKET_SOCKET)
242 path = socket_address_get_path(&p->address);
243 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
244 path = p->path;
245
246 if (!path)
247 continue;
248
249 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
250 if (r < 0)
251 return r;
252 }
253
254 return 0;
255 }
256
257 static int socket_add_device_dependencies(Socket *s) {
258 char *t;
259
260 assert(s);
261
262 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
263 return 0;
264
265 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
266 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
267 }
268
269 static int socket_add_default_dependencies(Socket *s) {
270 int r;
271 assert(s);
272
273 if (!UNIT(s)->default_dependencies)
274 return 0;
275
276 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279
280 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
281 r = unit_add_two_dependencies_by_name(UNIT(s),
282 UNIT_AFTER,
283 UNIT(s)->ignore_on_soft_reboot ? -EINVAL : UNIT_REQUIRES,
284 SPECIAL_SYSINIT_TARGET,
285 true,
286 UNIT_DEPENDENCY_DEFAULT);
287 if (r < 0)
288 return r;
289 }
290
291 if (!UNIT(s)->ignore_on_soft_reboot)
292 return unit_add_two_dependencies_by_name(
293 UNIT(s),
294 UNIT_BEFORE, UNIT_CONFLICTS,
295 SPECIAL_SHUTDOWN_TARGET, true,
296 UNIT_DEPENDENCY_DEFAULT);
297
298 return unit_add_dependencies_on_real_shutdown_targets(UNIT(s));
299 }
300
301 _pure_ static bool socket_has_exec(Socket *s) {
302 unsigned i;
303 assert(s);
304
305 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
306 if (s->exec_command[i])
307 return true;
308
309 return false;
310 }
311
312 static int socket_add_extras(Socket *s) {
313 Unit *u = UNIT(s);
314 int r;
315
316 assert(s);
317
318 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
319 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
320 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
321 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
322 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
323 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
324 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
325 * service starts are typical. */
326
327 if (s->trigger_limit.interval == USEC_INFINITY)
328 s->trigger_limit.interval = 2 * USEC_PER_SEC;
329
330 if (s->trigger_limit.burst == UINT_MAX) {
331 if (s->accept)
332 s->trigger_limit.burst = 200;
333 else
334 s->trigger_limit.burst = 20;
335 }
336
337 if (have_non_accept_socket(s)) {
338
339 if (!UNIT_DEREF(s->service)) {
340 Unit *x;
341
342 r = unit_load_related_unit(u, ".service", &x);
343 if (r < 0)
344 return r;
345
346 unit_ref_set(&s->service, u, x);
347 }
348
349 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
350 if (r < 0)
351 return r;
352 }
353
354 r = socket_add_mount_dependencies(s);
355 if (r < 0)
356 return r;
357
358 r = socket_add_device_dependencies(s);
359 if (r < 0)
360 return r;
361
362 r = unit_patch_contexts(u);
363 if (r < 0)
364 return r;
365
366 if (socket_has_exec(s)) {
367 r = unit_add_exec_dependencies(u, &s->exec_context);
368 if (r < 0)
369 return r;
370 }
371
372 r = unit_set_default_slice(u);
373 if (r < 0)
374 return r;
375
376 r = socket_add_default_dependencies(s);
377 if (r < 0)
378 return r;
379
380 return 0;
381 }
382
383 static const char *socket_find_symlink_target(Socket *s) {
384 const char *found = NULL;
385
386 LIST_FOREACH(port, p, s->ports) {
387 const char *f = NULL;
388
389 switch (p->type) {
390
391 case SOCKET_FIFO:
392 f = p->path;
393 break;
394
395 case SOCKET_SOCKET:
396 f = socket_address_get_path(&p->address);
397 break;
398
399 default:
400 break;
401 }
402
403 if (f) {
404 if (found)
405 return NULL;
406
407 found = f;
408 }
409 }
410
411 return found;
412 }
413
414 static int socket_verify(Socket *s) {
415 assert(s);
416 assert(UNIT(s)->load_state == UNIT_LOADED);
417
418 if (!s->ports)
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
420
421 if (s->accept && have_non_accept_socket(s))
422 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
423
424 if (s->accept && s->max_connections <= 0)
425 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
426
427 if (s->accept && UNIT_DEREF(s->service))
428 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
429
430 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
431 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
432
433 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
434 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.");
435
436 return 0;
437 }
438
439 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
440 assert(s);
441
442 if (s->peer.sa.sa_family == AF_INET)
443 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
444 else if (s->peer.sa.sa_family == AF_INET6)
445 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
446 else if (s->peer.sa.sa_family == AF_VSOCK)
447 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
448 else
449 assert_not_reached();
450 }
451
452 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
453 int r;
454
455 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
456 if (r != 0)
457 return r;
458
459 switch (x->peer.sa.sa_family) {
460 case AF_INET:
461 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
462 case AF_INET6:
463 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
464 case AF_VSOCK:
465 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
466 }
467 assert_not_reached();
468 }
469
470 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
471
472 static int socket_load(Unit *u) {
473 Socket *s = SOCKET(u);
474 int r;
475
476 assert(u);
477 assert(u->load_state == UNIT_STUB);
478
479 r = unit_load_fragment_and_dropin(u, true);
480 if (r < 0)
481 return r;
482
483 if (u->load_state != UNIT_LOADED)
484 return 0;
485
486 /* This is a new unit? Then let's add in some extras */
487 r = socket_add_extras(s);
488 if (r < 0)
489 return r;
490
491 return socket_verify(s);
492 }
493
494 static SocketPeer *socket_peer_new(void) {
495 SocketPeer *p;
496
497 p = new(SocketPeer, 1);
498 if (!p)
499 return NULL;
500
501 *p = (SocketPeer) {
502 .n_ref = 1,
503 };
504 return p;
505 }
506
507 static SocketPeer *socket_peer_free(SocketPeer *p) {
508 assert(p);
509
510 if (p->socket)
511 set_remove(p->socket->peers_by_address, p);
512
513 return mfree(p);
514 }
515
516 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
517
518 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
519 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
520 SocketPeer sa = {
521 .peer_salen = sizeof(union sockaddr_union),
522 }, *i;
523 int r;
524
525 assert(fd >= 0);
526 assert(s);
527
528 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
529 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
530
531 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
532 *p = NULL;
533 return 0;
534 }
535
536 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
537 if (r < 0)
538 return r;
539
540 i = set_get(s->peers_by_address, &sa);
541 if (i) {
542 *p = socket_peer_ref(i);
543 return 1;
544 }
545
546 remote = socket_peer_new();
547 if (!remote)
548 return log_oom();
549
550 remote->peer = sa.peer;
551 remote->peer_salen = sa.peer_salen;
552
553 r = set_put(s->peers_by_address, remote);
554 if (r < 0)
555 return r;
556
557 remote->socket = s;
558
559 *p = TAKE_PTR(remote);
560 return 1;
561 }
562
563 _const_ static const char* listen_lookup(int family, int type) {
564
565 if (family == AF_NETLINK)
566 return "ListenNetlink";
567
568 if (type == SOCK_STREAM)
569 return "ListenStream";
570 else if (type == SOCK_DGRAM)
571 return "ListenDatagram";
572 else if (type == SOCK_SEQPACKET)
573 return "ListenSequentialPacket";
574
575 assert_not_reached();
576 return NULL;
577 }
578
579 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
580 Socket *s = SOCKET(u);
581 const char *prefix2, *str;
582
583 assert(s);
584 assert(f);
585
586 prefix = strempty(prefix);
587 prefix2 = strjoina(prefix, "\t");
588
589 fprintf(f,
590 "%sSocket State: %s\n"
591 "%sResult: %s\n"
592 "%sClean Result: %s\n"
593 "%sBindIPv6Only: %s\n"
594 "%sBacklog: %u\n"
595 "%sSocketMode: %04o\n"
596 "%sDirectoryMode: %04o\n"
597 "%sKeepAlive: %s\n"
598 "%sNoDelay: %s\n"
599 "%sFreeBind: %s\n"
600 "%sTransparent: %s\n"
601 "%sBroadcast: %s\n"
602 "%sPassCredentials: %s\n"
603 "%sPassSecurity: %s\n"
604 "%sPassPacketInfo: %s\n"
605 "%sTCPCongestion: %s\n"
606 "%sRemoveOnStop: %s\n"
607 "%sWritable: %s\n"
608 "%sFileDescriptorName: %s\n"
609 "%sSELinuxContextFromNet: %s\n",
610 prefix, socket_state_to_string(s->state),
611 prefix, socket_result_to_string(s->result),
612 prefix, socket_result_to_string(s->clean_result),
613 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
614 prefix, s->backlog,
615 prefix, s->socket_mode,
616 prefix, s->directory_mode,
617 prefix, yes_no(s->keep_alive),
618 prefix, yes_no(s->no_delay),
619 prefix, yes_no(s->free_bind),
620 prefix, yes_no(s->transparent),
621 prefix, yes_no(s->broadcast),
622 prefix, yes_no(s->pass_cred),
623 prefix, yes_no(s->pass_sec),
624 prefix, yes_no(s->pass_pktinfo),
625 prefix, strna(s->tcp_congestion),
626 prefix, yes_no(s->remove_on_stop),
627 prefix, yes_no(s->writable),
628 prefix, socket_fdname(s),
629 prefix, yes_no(s->selinux_context_from_net));
630
631 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
632 fprintf(f,
633 "%sTimestamping: %s\n",
634 prefix, socket_timestamping_to_string(s->timestamping));
635
636 if (s->control_pid > 0)
637 fprintf(f,
638 "%sControl PID: "PID_FMT"\n",
639 prefix, s->control_pid);
640
641 if (s->bind_to_device)
642 fprintf(f,
643 "%sBindToDevice: %s\n",
644 prefix, s->bind_to_device);
645
646 if (s->accept)
647 fprintf(f,
648 "%sAccepted: %u\n"
649 "%sNConnections: %u\n"
650 "%sMaxConnections: %u\n"
651 "%sMaxConnectionsPerSource: %u\n",
652 prefix, s->n_accepted,
653 prefix, s->n_connections,
654 prefix, s->max_connections,
655 prefix, s->max_connections_per_source);
656 else
657 fprintf(f,
658 "%sFlushPending: %s\n",
659 prefix, yes_no(s->flush_pending));
660
661
662 if (s->priority >= 0)
663 fprintf(f,
664 "%sPriority: %i\n",
665 prefix, s->priority);
666
667 if (s->receive_buffer > 0)
668 fprintf(f,
669 "%sReceiveBuffer: %zu\n",
670 prefix, s->receive_buffer);
671
672 if (s->send_buffer > 0)
673 fprintf(f,
674 "%sSendBuffer: %zu\n",
675 prefix, s->send_buffer);
676
677 if (s->ip_tos >= 0)
678 fprintf(f,
679 "%sIPTOS: %i\n",
680 prefix, s->ip_tos);
681
682 if (s->ip_ttl >= 0)
683 fprintf(f,
684 "%sIPTTL: %i\n",
685 prefix, s->ip_ttl);
686
687 if (s->pipe_size > 0)
688 fprintf(f,
689 "%sPipeSize: %zu\n",
690 prefix, s->pipe_size);
691
692 if (s->mark >= 0)
693 fprintf(f,
694 "%sMark: %i\n",
695 prefix, s->mark);
696
697 if (s->mq_maxmsg > 0)
698 fprintf(f,
699 "%sMessageQueueMaxMessages: %li\n",
700 prefix, s->mq_maxmsg);
701
702 if (s->mq_msgsize > 0)
703 fprintf(f,
704 "%sMessageQueueMessageSize: %li\n",
705 prefix, s->mq_msgsize);
706
707 if (s->reuse_port)
708 fprintf(f,
709 "%sReusePort: %s\n",
710 prefix, yes_no(s->reuse_port));
711
712 if (s->smack)
713 fprintf(f,
714 "%sSmackLabel: %s\n",
715 prefix, s->smack);
716
717 if (s->smack_ip_in)
718 fprintf(f,
719 "%sSmackLabelIPIn: %s\n",
720 prefix, s->smack_ip_in);
721
722 if (s->smack_ip_out)
723 fprintf(f,
724 "%sSmackLabelIPOut: %s\n",
725 prefix, s->smack_ip_out);
726
727 if (!isempty(s->user) || !isempty(s->group))
728 fprintf(f,
729 "%sSocketUser: %s\n"
730 "%sSocketGroup: %s\n",
731 prefix, strna(s->user),
732 prefix, strna(s->group));
733
734 if (timestamp_is_set(s->keep_alive_time))
735 fprintf(f,
736 "%sKeepAliveTimeSec: %s\n",
737 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
738
739 if (s->keep_alive_interval > 0)
740 fprintf(f,
741 "%sKeepAliveIntervalSec: %s\n",
742 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
743
744 if (s->keep_alive_cnt > 0)
745 fprintf(f,
746 "%sKeepAliveProbes: %u\n",
747 prefix, s->keep_alive_cnt);
748
749 if (s->defer_accept > 0)
750 fprintf(f,
751 "%sDeferAcceptSec: %s\n",
752 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
753
754 LIST_FOREACH(port, p, s->ports) {
755
756 switch (p->type) {
757 case SOCKET_SOCKET: {
758 _cleanup_free_ char *k = NULL;
759 int r;
760
761 r = socket_address_print(&p->address, &k);
762 if (r < 0) {
763 errno = -r;
764 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
765 } else
766 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
767 break;
768 }
769 case SOCKET_SPECIAL:
770 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
771 break;
772 case SOCKET_USB_FUNCTION:
773 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
774 break;
775 case SOCKET_MQUEUE:
776 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
777 break;
778 default:
779 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
780 }
781 }
782
783 fprintf(f,
784 "%sTriggerLimitIntervalSec: %s\n"
785 "%sTriggerLimitBurst: %u\n",
786 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
787 prefix, s->trigger_limit.burst);
788
789 str = ip_protocol_to_name(s->socket_protocol);
790 if (str)
791 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
792
793 if (!strv_isempty(s->symlinks)) {
794 fprintf(f, "%sSymlinks:", prefix);
795 STRV_FOREACH(q, s->symlinks)
796 fprintf(f, " %s", *q);
797
798 fprintf(f, "\n");
799 }
800
801 fprintf(f,
802 "%sTimeoutSec: %s\n",
803 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
804
805 exec_context_dump(&s->exec_context, f, prefix);
806 kill_context_dump(&s->kill_context, f, prefix);
807
808 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
809 if (!s->exec_command[c])
810 continue;
811
812 fprintf(f, "%s-> %s:\n",
813 prefix, socket_exec_command_to_string(c));
814
815 exec_command_dump_list(s->exec_command[c], f, prefix2);
816 }
817
818 cgroup_context_dump(UNIT(s), f, prefix);
819 }
820
821 static int instance_from_socket(int fd, unsigned nr, char **instance) {
822 socklen_t l;
823 char *r;
824 union sockaddr_union local, remote;
825
826 assert(fd >= 0);
827 assert(instance);
828
829 l = sizeof(local);
830 if (getsockname(fd, &local.sa, &l) < 0)
831 return -errno;
832
833 l = sizeof(remote);
834 if (getpeername(fd, &remote.sa, &l) < 0)
835 return -errno;
836
837 switch (local.sa.sa_family) {
838
839 case AF_INET: {
840 uint32_t
841 a = be32toh(local.in.sin_addr.s_addr),
842 b = be32toh(remote.in.sin_addr.s_addr);
843
844 if (asprintf(&r,
845 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
846 nr,
847 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
848 be16toh(local.in.sin_port),
849 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
850 be16toh(remote.in.sin_port)) < 0)
851 return -ENOMEM;
852
853 break;
854 }
855
856 case AF_INET6: {
857 static const unsigned char ipv4_prefix[] = {
858 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
859 };
860
861 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
862 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
863 const uint8_t
864 *a = local.in6.sin6_addr.s6_addr+12,
865 *b = remote.in6.sin6_addr.s6_addr+12;
866
867 if (asprintf(&r,
868 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
869 nr,
870 a[0], a[1], a[2], a[3],
871 be16toh(local.in6.sin6_port),
872 b[0], b[1], b[2], b[3],
873 be16toh(remote.in6.sin6_port)) < 0)
874 return -ENOMEM;
875 } else {
876 if (asprintf(&r,
877 "%u-%s:%u-%s:%u",
878 nr,
879 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
880 be16toh(local.in6.sin6_port),
881 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
882 be16toh(remote.in6.sin6_port)) < 0)
883 return -ENOMEM;
884 }
885
886 break;
887 }
888
889 case AF_UNIX: {
890 struct ucred ucred;
891 int k;
892
893 k = getpeercred(fd, &ucred);
894 if (k >= 0) {
895 if (asprintf(&r,
896 "%u-"PID_FMT"-"UID_FMT,
897 nr, ucred.pid, ucred.uid) < 0)
898 return -ENOMEM;
899 } else if (k == -ENODATA) {
900 /* This handles the case where somebody is
901 * connecting from another pid/uid namespace
902 * (e.g. from outside of our container). */
903 if (asprintf(&r,
904 "%u-unknown",
905 nr) < 0)
906 return -ENOMEM;
907 } else
908 return k;
909
910 break;
911 }
912
913 case AF_VSOCK:
914 if (asprintf(&r,
915 "%u-%u:%u-%u:%u",
916 nr,
917 local.vm.svm_cid, local.vm.svm_port,
918 remote.vm.svm_cid, remote.vm.svm_port) < 0)
919 return -ENOMEM;
920
921 break;
922
923 default:
924 assert_not_reached();
925 }
926
927 *instance = r;
928 return 0;
929 }
930
931 static void socket_close_fds(Socket *s) {
932 assert(s);
933
934 LIST_FOREACH(port, p, s->ports) {
935 bool was_open;
936
937 was_open = p->fd >= 0;
938
939 p->event_source = sd_event_source_disable_unref(p->event_source);
940 p->fd = safe_close(p->fd);
941 socket_cleanup_fd_list(p);
942
943 /* One little note: we should normally not delete any sockets in the file system here! After all some
944 * other process we spawned might still have a reference of this fd and wants to continue to use
945 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
946 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
947 * anyway, but only then. */
948
949 if (!was_open || !s->remove_on_stop)
950 continue;
951
952 switch (p->type) {
953
954 case SOCKET_FIFO:
955 (void) unlink(p->path);
956 break;
957
958 case SOCKET_MQUEUE:
959 (void) mq_unlink(p->path);
960 break;
961
962 case SOCKET_SOCKET:
963 (void) socket_address_unlink(&p->address);
964 break;
965
966 default:
967 break;
968 }
969 }
970
971 if (s->remove_on_stop)
972 STRV_FOREACH(i, s->symlinks)
973 (void) unlink(*i);
974
975 /* Note that we don't return NULL here, since s has not been freed. */
976 }
977
978 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
979 int r;
980
981 assert(s);
982 assert(p);
983 assert(fd >= 0);
984
985 if (s->keep_alive) {
986 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
987 if (r < 0)
988 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
989 }
990
991 if (timestamp_is_set(s->keep_alive_time)) {
992 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
993 if (r < 0)
994 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
995 }
996
997 if (s->keep_alive_interval > 0) {
998 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
999 if (r < 0)
1000 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
1001 }
1002
1003 if (s->keep_alive_cnt > 0) {
1004 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1005 if (r < 0)
1006 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1007 }
1008
1009 if (s->defer_accept > 0) {
1010 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1011 if (r < 0)
1012 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1013 }
1014
1015 if (s->no_delay) {
1016 if (s->socket_protocol == IPPROTO_SCTP) {
1017 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1018 if (r < 0)
1019 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1020 } else {
1021 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1022 if (r < 0)
1023 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1024 }
1025 }
1026
1027 if (s->broadcast) {
1028 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1029 if (r < 0)
1030 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1031 }
1032
1033 if (s->pass_cred) {
1034 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1035 if (r < 0)
1036 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1037 }
1038
1039 if (s->pass_sec) {
1040 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1041 if (r < 0)
1042 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1043 }
1044
1045 if (s->pass_pktinfo) {
1046 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1047 if (r < 0)
1048 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1049 }
1050
1051 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1052 r = setsockopt_int(fd, SOL_SOCKET,
1053 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1054 true);
1055 if (r < 0)
1056 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1057 }
1058
1059 if (s->priority >= 0) {
1060 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1061 if (r < 0)
1062 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1063 }
1064
1065 if (s->receive_buffer > 0) {
1066 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1067 if (r < 0)
1068 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1069 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1070 }
1071
1072 if (s->send_buffer > 0) {
1073 r = fd_set_sndbuf(fd, s->send_buffer, false);
1074 if (r < 0)
1075 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1076 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1077 }
1078
1079 if (s->mark >= 0) {
1080 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1081 if (r < 0)
1082 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1083 }
1084
1085 if (s->ip_tos >= 0) {
1086 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1087 if (r < 0)
1088 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1089 }
1090
1091 if (s->ip_ttl >= 0) {
1092 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1093 if (r < 0)
1094 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1095 }
1096
1097 if (s->tcp_congestion)
1098 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1099 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1100
1101 if (s->smack_ip_in) {
1102 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1103 if (r < 0)
1104 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1105 }
1106
1107 if (s->smack_ip_out) {
1108 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1109 if (r < 0)
1110 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1111 }
1112 }
1113
1114 static void socket_apply_fifo_options(Socket *s, int fd) {
1115 int r;
1116
1117 assert(s);
1118 assert(fd >= 0);
1119
1120 if (s->pipe_size > 0)
1121 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1122 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1123
1124 if (s->smack) {
1125 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1126 if (r < 0)
1127 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1128 }
1129 }
1130
1131 static int fifo_address_create(
1132 const char *path,
1133 mode_t directory_mode,
1134 mode_t socket_mode) {
1135
1136 _cleanup_close_ int fd = -EBADF;
1137 mode_t old_mask;
1138 struct stat st;
1139 int r;
1140
1141 assert(path);
1142
1143 (void) mkdir_parents_label(path, directory_mode);
1144
1145 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1146 if (r < 0)
1147 return r;
1148
1149 /* Enforce the right access mode for the fifo */
1150 old_mask = umask(~socket_mode);
1151
1152 /* Include the original umask in our mask */
1153 (void) umask(~socket_mode | old_mask);
1154
1155 r = mkfifo(path, socket_mode);
1156 (void) umask(old_mask);
1157
1158 if (r < 0 && errno != EEXIST) {
1159 r = -errno;
1160 goto fail;
1161 }
1162
1163 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1164 if (fd < 0) {
1165 r = -errno;
1166 goto fail;
1167 }
1168
1169 mac_selinux_create_file_clear();
1170
1171 if (fstat(fd, &st) < 0) {
1172 r = -errno;
1173 goto fail;
1174 }
1175
1176 if (!S_ISFIFO(st.st_mode) ||
1177 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1178 st.st_uid != getuid() ||
1179 st.st_gid != getgid()) {
1180 r = -EEXIST;
1181 goto fail;
1182 }
1183
1184 return TAKE_FD(fd);
1185
1186 fail:
1187 mac_selinux_create_file_clear();
1188 return r;
1189 }
1190
1191 static int special_address_create(const char *path, bool writable) {
1192 _cleanup_close_ int fd = -EBADF;
1193 struct stat st;
1194
1195 assert(path);
1196
1197 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1198 if (fd < 0)
1199 return -errno;
1200
1201 if (fstat(fd, &st) < 0)
1202 return -errno;
1203
1204 /* Check whether this is a /proc, /sys or /dev file or char device */
1205 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1206 return -EEXIST;
1207
1208 return TAKE_FD(fd);
1209 }
1210
1211 static int usbffs_address_create(const char *path) {
1212 _cleanup_close_ int fd = -EBADF;
1213 struct stat st;
1214
1215 assert(path);
1216
1217 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1218 if (fd < 0)
1219 return -errno;
1220
1221 if (fstat(fd, &st) < 0)
1222 return -errno;
1223
1224 /* Check whether this is a regular file (ffs endpoint) */
1225 if (!S_ISREG(st.st_mode))
1226 return -EEXIST;
1227
1228 return TAKE_FD(fd);
1229 }
1230
1231 static int mq_address_create(
1232 const char *path,
1233 mode_t mq_mode,
1234 long maxmsg,
1235 long msgsize) {
1236
1237 _cleanup_close_ int fd = -EBADF;
1238 struct stat st;
1239 mode_t old_mask;
1240 struct mq_attr _attr, *attr = NULL;
1241
1242 assert(path);
1243
1244 if (maxmsg > 0 && msgsize > 0) {
1245 _attr = (struct mq_attr) {
1246 .mq_flags = O_NONBLOCK,
1247 .mq_maxmsg = maxmsg,
1248 .mq_msgsize = msgsize,
1249 };
1250 attr = &_attr;
1251 }
1252
1253 /* Enforce the right access mode for the mq */
1254 old_mask = umask(~mq_mode);
1255
1256 /* Include the original umask in our mask */
1257 (void) umask(~mq_mode | old_mask);
1258 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1259 (void) umask(old_mask);
1260
1261 if (fd < 0)
1262 return -errno;
1263
1264 if (fstat(fd, &st) < 0)
1265 return -errno;
1266
1267 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1268 st.st_uid != getuid() ||
1269 st.st_gid != getgid())
1270 return -EEXIST;
1271
1272 return TAKE_FD(fd);
1273 }
1274
1275 static int socket_symlink(Socket *s) {
1276 const char *p;
1277 int r;
1278
1279 assert(s);
1280
1281 p = socket_find_symlink_target(s);
1282 if (!p)
1283 return 0;
1284
1285 STRV_FOREACH(i, s->symlinks) {
1286 (void) mkdir_parents_label(*i, s->directory_mode);
1287
1288 r = symlink_idempotent(p, *i, false);
1289
1290 if (r == -EEXIST && s->remove_on_stop) {
1291 /* If there's already something where we want to create the symlink, and the destructive
1292 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1293 * again. */
1294
1295 if (unlink(*i) >= 0)
1296 r = symlink_idempotent(p, *i, false);
1297 }
1298
1299 if (r < 0)
1300 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1301 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1302 }
1303
1304 return 0;
1305 }
1306
1307 static int usbffs_write_descs(int fd, Service *s) {
1308 int r;
1309
1310 if (!s->usb_function_descriptors || !s->usb_function_strings)
1311 return -EINVAL;
1312
1313 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1314 if (r < 0)
1315 return r;
1316
1317 return copy_file_fd(s->usb_function_strings, fd, 0);
1318 }
1319
1320 static int usbffs_select_ep(const struct dirent *d) {
1321 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1322 }
1323
1324 static int usbffs_dispatch_eps(SocketPort *p) {
1325 _cleanup_free_ struct dirent **ent = NULL;
1326 size_t n, k;
1327 int r;
1328
1329 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1330 if (r < 0)
1331 return -errno;
1332
1333 n = (size_t) r;
1334 p->auxiliary_fds = new(int, n);
1335 if (!p->auxiliary_fds) {
1336 r = -ENOMEM;
1337 goto clear;
1338 }
1339
1340 p->n_auxiliary_fds = n;
1341
1342 k = 0;
1343 for (size_t i = 0; i < n; ++i) {
1344 _cleanup_free_ char *ep = NULL;
1345
1346 ep = path_make_absolute(ent[i]->d_name, p->path);
1347 if (!ep) {
1348 r = -ENOMEM;
1349 goto fail;
1350 }
1351
1352 path_simplify(ep);
1353
1354 r = usbffs_address_create(ep);
1355 if (r < 0)
1356 goto fail;
1357
1358 p->auxiliary_fds[k++] = r;
1359 }
1360
1361 r = 0;
1362 goto clear;
1363
1364 fail:
1365 close_many(p->auxiliary_fds, k);
1366 p->auxiliary_fds = mfree(p->auxiliary_fds);
1367 p->n_auxiliary_fds = 0;
1368
1369 clear:
1370 for (size_t i = 0; i < n; ++i)
1371 free(ent[i]);
1372
1373 return r;
1374 }
1375
1376 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1377 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1378 *
1379 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1380 * instance name.
1381 */
1382
1383 if (UNIT_ISSET(s->service)) {
1384 *ret = UNIT_DEREF(s->service);
1385 return 0;
1386 }
1387
1388 if (!s->accept)
1389 return -ENODATA;
1390
1391 /* Build the instance name and load the unit */
1392 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1393 int r;
1394
1395 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1396 if (r < 0)
1397 return r;
1398
1399 if (cfd >= 0) {
1400 r = instance_from_socket(cfd, s->n_accepted, &instance);
1401 if (ERRNO_IS_DISCONNECT(r))
1402 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1403 * different errors. This connection is over, but the socket unit lives on. */
1404 return log_unit_debug_errno(UNIT(s), r,
1405 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1406 errno_to_name(r));
1407 if (r < 0)
1408 return r;
1409 }
1410
1411 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1412 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1413 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1414 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1415 if (r < 0)
1416 return r;
1417
1418 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1419 }
1420
1421 static int socket_determine_selinux_label(Socket *s, char **ret) {
1422 int r;
1423
1424 assert(s);
1425 assert(ret);
1426
1427 Unit *service;
1428 ExecCommand *c;
1429 const char *exec_context;
1430 _cleanup_free_ char *path = NULL;
1431
1432 r = socket_load_service_unit(s, -1, &service);
1433 if (r == -ENODATA)
1434 goto no_label;
1435 if (r < 0)
1436 return r;
1437
1438 exec_context = SERVICE(service)->exec_context.selinux_context;
1439 if (exec_context) {
1440 char *con;
1441
1442 con = strdup(exec_context);
1443 if (!con)
1444 return -ENOMEM;
1445
1446 *ret = TAKE_PTR(con);
1447 return 0;
1448 }
1449
1450 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1451 if (!c)
1452 goto no_label;
1453
1454 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1455 if (r < 0)
1456 goto no_label;
1457
1458 r = mac_selinux_get_create_label_from_exe(path, ret);
1459 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1460 goto no_label;
1461 return r;
1462
1463 no_label:
1464 *ret = NULL;
1465 return 0;
1466 }
1467
1468 static int socket_address_listen_do(
1469 Socket *s,
1470 const SocketAddress *address,
1471 const char *label) {
1472
1473 assert(s);
1474 assert(address);
1475
1476 return socket_address_listen(
1477 address,
1478 SOCK_CLOEXEC|SOCK_NONBLOCK,
1479 s->backlog,
1480 s->bind_ipv6_only,
1481 s->bind_to_device,
1482 s->reuse_port,
1483 s->free_bind,
1484 s->transparent,
1485 s->directory_mode,
1486 s->socket_mode,
1487 label);
1488 }
1489
1490 #define log_address_error_errno(u, address, error, fmt) \
1491 ({ \
1492 _cleanup_free_ char *_t = NULL; \
1493 \
1494 (void) socket_address_print(address, &_t); \
1495 log_unit_error_errno(u, error, fmt, strna(_t)); \
1496 })
1497
1498 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1499 int r;
1500
1501 assert(address);
1502 assert(context);
1503
1504 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1505
1506 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1507 r = bpf_firewall_supported();
1508 if (r < 0)
1509 return r;
1510 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1511 return true;
1512 }
1513
1514 return exec_needs_network_namespace(context);
1515 }
1516
1517 static int socket_address_listen_in_cgroup(
1518 Socket *s,
1519 const SocketAddress *address,
1520 const char *label) {
1521
1522 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1523 int fd, r;
1524 pid_t pid;
1525
1526 assert(s);
1527 assert(address);
1528
1529 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1530 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1531 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1532 * such. */
1533
1534 r = fork_needed(address, &s->exec_context);
1535 if (r < 0)
1536 return r;
1537 if (r == 0) {
1538 /* Shortcut things... */
1539 fd = socket_address_listen_do(s, address, label);
1540 if (fd < 0)
1541 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1542
1543 return fd;
1544 }
1545
1546 r = unit_setup_exec_runtime(UNIT(s));
1547 if (r < 0)
1548 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1549
1550 if (s->exec_context.network_namespace_path &&
1551 s->exec_runtime &&
1552 s->exec_runtime->shared &&
1553 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1554 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1555 if (r < 0)
1556 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1557 }
1558
1559 if (s->exec_context.ipc_namespace_path &&
1560 s->exec_runtime &&
1561 s->exec_runtime->shared &&
1562 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1563 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1564 if (r < 0)
1565 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1566 }
1567
1568 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1569 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1570
1571 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1572 if (r < 0)
1573 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1574 if (r == 0) {
1575 /* Child */
1576
1577 pair[0] = safe_close(pair[0]);
1578
1579 if (exec_needs_network_namespace(&s->exec_context) &&
1580 s->exec_runtime &&
1581 s->exec_runtime->shared &&
1582 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1583
1584 if (ns_type_supported(NAMESPACE_NET)) {
1585 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1586 if (r < 0) {
1587 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1588 _exit(EXIT_NETWORK);
1589 }
1590 } else if (s->exec_context.network_namespace_path) {
1591 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1592 _exit(EXIT_NETWORK);
1593 } else
1594 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1595 }
1596
1597 fd = socket_address_listen_do(s, address, label);
1598 if (fd < 0) {
1599 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1600 _exit(EXIT_FAILURE);
1601 }
1602
1603 r = send_one_fd(pair[1], fd, 0);
1604 if (r < 0) {
1605 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1606 _exit(EXIT_FAILURE);
1607 }
1608
1609 _exit(EXIT_SUCCESS);
1610 }
1611
1612 pair[1] = safe_close(pair[1]);
1613 fd = receive_one_fd(pair[0], 0);
1614
1615 /* We synchronously wait for the helper, as it shouldn't be slow */
1616 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1617 if (r < 0) {
1618 safe_close(fd);
1619 return r;
1620 }
1621
1622 if (fd < 0)
1623 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1624
1625 return fd;
1626 }
1627
1628 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1629
1630 static int socket_open_fds(Socket *orig_s) {
1631 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1632 _cleanup_(mac_selinux_freep) char *label = NULL;
1633 bool know_label = false;
1634 int r;
1635
1636 assert(s);
1637
1638 LIST_FOREACH(port, p, s->ports) {
1639
1640 if (p->fd >= 0)
1641 continue;
1642
1643 switch (p->type) {
1644
1645 case SOCKET_SOCKET:
1646
1647 if (!know_label) {
1648 /* Figure out the label, if we don't it know yet. We do it once for the first
1649 * socket where we need this and remember it for the rest. */
1650
1651 r = socket_determine_selinux_label(s, &label);
1652 if (r < 0)
1653 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1654
1655 know_label = true;
1656 }
1657
1658 /* Apply the socket protocol */
1659 switch (p->address.type) {
1660
1661 case SOCK_STREAM:
1662 case SOCK_SEQPACKET:
1663 if (s->socket_protocol == IPPROTO_SCTP)
1664 p->address.protocol = s->socket_protocol;
1665 break;
1666
1667 case SOCK_DGRAM:
1668 if (s->socket_protocol == IPPROTO_UDPLITE)
1669 p->address.protocol = s->socket_protocol;
1670 break;
1671 }
1672
1673 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1674 if (p->fd < 0)
1675 return p->fd;
1676
1677 socket_apply_socket_options(s, p, p->fd);
1678 socket_symlink(s);
1679 break;
1680
1681 case SOCKET_SPECIAL:
1682
1683 p->fd = special_address_create(p->path, s->writable);
1684 if (p->fd < 0)
1685 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1686 break;
1687
1688 case SOCKET_FIFO:
1689
1690 p->fd = fifo_address_create(
1691 p->path,
1692 s->directory_mode,
1693 s->socket_mode);
1694 if (p->fd < 0)
1695 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1696
1697 socket_apply_fifo_options(s, p->fd);
1698 socket_symlink(s);
1699 break;
1700
1701 case SOCKET_MQUEUE:
1702
1703 p->fd = mq_address_create(
1704 p->path,
1705 s->socket_mode,
1706 s->mq_maxmsg,
1707 s->mq_msgsize);
1708 if (p->fd < 0)
1709 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1710 break;
1711
1712 case SOCKET_USB_FUNCTION: {
1713 _cleanup_free_ char *ep = NULL;
1714
1715 ep = path_make_absolute("ep0", p->path);
1716 if (!ep)
1717 return -ENOMEM;
1718
1719 p->fd = usbffs_address_create(ep);
1720 if (p->fd < 0)
1721 return p->fd;
1722
1723 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1724 if (r < 0)
1725 return r;
1726
1727 r = usbffs_dispatch_eps(p);
1728 if (r < 0)
1729 return r;
1730
1731 break;
1732 }
1733 default:
1734 assert_not_reached();
1735 }
1736 }
1737
1738 s = NULL;
1739 return 0;
1740 }
1741
1742 static void socket_unwatch_fds(Socket *s) {
1743 int r;
1744
1745 assert(s);
1746
1747 LIST_FOREACH(port, p, s->ports) {
1748 if (p->fd < 0)
1749 continue;
1750
1751 if (!p->event_source)
1752 continue;
1753
1754 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1755 if (r < 0)
1756 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1757 }
1758 }
1759
1760 static int socket_watch_fds(Socket *s) {
1761 int r;
1762
1763 assert(s);
1764
1765 LIST_FOREACH(port, p, s->ports) {
1766 if (p->fd < 0)
1767 continue;
1768
1769 if (p->event_source) {
1770 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1771 if (r < 0)
1772 goto fail;
1773 } else {
1774 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1775 if (r < 0)
1776 goto fail;
1777
1778 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1779 }
1780 }
1781
1782 return 0;
1783
1784 fail:
1785 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1786 socket_unwatch_fds(s);
1787 return r;
1788 }
1789
1790 enum {
1791 SOCKET_OPEN_NONE,
1792 SOCKET_OPEN_SOME,
1793 SOCKET_OPEN_ALL,
1794 };
1795
1796 static int socket_check_open(Socket *s) {
1797 bool have_open = false, have_closed = false;
1798
1799 assert(s);
1800
1801 LIST_FOREACH(port, p, s->ports) {
1802 if (p->fd < 0)
1803 have_closed = true;
1804 else
1805 have_open = true;
1806
1807 if (have_open && have_closed)
1808 return SOCKET_OPEN_SOME;
1809 }
1810
1811 if (have_open)
1812 return SOCKET_OPEN_ALL;
1813
1814 return SOCKET_OPEN_NONE;
1815 }
1816
1817 static void socket_set_state(Socket *s, SocketState state) {
1818 SocketState old_state;
1819 assert(s);
1820
1821 if (s->state != state)
1822 bus_unit_send_pending_change_signal(UNIT(s), false);
1823
1824 old_state = s->state;
1825 s->state = state;
1826
1827 if (!IN_SET(state,
1828 SOCKET_START_PRE,
1829 SOCKET_START_CHOWN,
1830 SOCKET_START_POST,
1831 SOCKET_STOP_PRE,
1832 SOCKET_STOP_PRE_SIGTERM,
1833 SOCKET_STOP_PRE_SIGKILL,
1834 SOCKET_STOP_POST,
1835 SOCKET_FINAL_SIGTERM,
1836 SOCKET_FINAL_SIGKILL,
1837 SOCKET_CLEANING)) {
1838
1839 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1840 socket_unwatch_control_pid(s);
1841 s->control_command = NULL;
1842 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1843 }
1844
1845 if (state != SOCKET_LISTENING)
1846 socket_unwatch_fds(s);
1847
1848 if (!IN_SET(state,
1849 SOCKET_START_CHOWN,
1850 SOCKET_START_POST,
1851 SOCKET_LISTENING,
1852 SOCKET_RUNNING,
1853 SOCKET_STOP_PRE,
1854 SOCKET_STOP_PRE_SIGTERM,
1855 SOCKET_STOP_PRE_SIGKILL,
1856 SOCKET_CLEANING))
1857 socket_close_fds(s);
1858
1859 if (state != old_state)
1860 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1861
1862 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1863 }
1864
1865 static int socket_coldplug(Unit *u) {
1866 Socket *s = SOCKET(u);
1867 int r;
1868
1869 assert(s);
1870 assert(s->state == SOCKET_DEAD);
1871
1872 if (s->deserialized_state == s->state)
1873 return 0;
1874
1875 if (s->control_pid > 0 &&
1876 pid_is_unwaited(s->control_pid) &&
1877 IN_SET(s->deserialized_state,
1878 SOCKET_START_PRE,
1879 SOCKET_START_CHOWN,
1880 SOCKET_START_POST,
1881 SOCKET_STOP_PRE,
1882 SOCKET_STOP_PRE_SIGTERM,
1883 SOCKET_STOP_PRE_SIGKILL,
1884 SOCKET_STOP_POST,
1885 SOCKET_FINAL_SIGTERM,
1886 SOCKET_FINAL_SIGKILL,
1887 SOCKET_CLEANING)) {
1888
1889 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1890 if (r < 0)
1891 return r;
1892
1893 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1894 if (r < 0)
1895 return r;
1896 }
1897
1898 if (IN_SET(s->deserialized_state,
1899 SOCKET_START_CHOWN,
1900 SOCKET_START_POST,
1901 SOCKET_LISTENING,
1902 SOCKET_RUNNING)) {
1903
1904 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1905 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1906 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1907 * and if there's a mismatch, warn loudly. */
1908
1909 r = socket_check_open(s);
1910 if (r == SOCKET_OPEN_NONE)
1911 log_unit_warning(UNIT(s),
1912 "Socket unit configuration has changed while unit has been running, "
1913 "no open socket file descriptor left. "
1914 "The socket unit is not functional until restarted.");
1915 else if (r == SOCKET_OPEN_SOME)
1916 log_unit_warning(UNIT(s),
1917 "Socket unit configuration has changed while unit has been running, "
1918 "and some socket file descriptors have not been opened yet. "
1919 "The socket unit is not fully functional until restarted.");
1920 }
1921
1922 if (s->deserialized_state == SOCKET_LISTENING) {
1923 r = socket_watch_fds(s);
1924 if (r < 0)
1925 return r;
1926 }
1927
1928 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1929 (void) unit_setup_exec_runtime(u);
1930
1931 socket_set_state(s, s->deserialized_state);
1932 return 0;
1933 }
1934
1935 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1936
1937 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1938 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1939 .stdin_fd = -EBADF,
1940 .stdout_fd = -EBADF,
1941 .stderr_fd = -EBADF,
1942 .exec_fd = -EBADF,
1943 };
1944 pid_t pid;
1945 int r;
1946
1947 assert(s);
1948 assert(c);
1949 assert(_pid);
1950
1951 r = unit_prepare_exec(UNIT(s));
1952 if (r < 0)
1953 return r;
1954
1955 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1956 if (r < 0)
1957 return r;
1958
1959 r = unit_set_exec_params(UNIT(s), &exec_params);
1960 if (r < 0)
1961 return r;
1962
1963 r = exec_spawn(UNIT(s),
1964 c,
1965 &s->exec_context,
1966 &exec_params,
1967 s->exec_runtime,
1968 &s->cgroup_context,
1969 &pid);
1970 if (r < 0)
1971 return r;
1972
1973 r = unit_watch_pid(UNIT(s), pid, true);
1974 if (r < 0)
1975 return r;
1976
1977 *_pid = pid;
1978
1979 return 0;
1980 }
1981
1982 static int socket_chown(Socket *s, pid_t *_pid) {
1983 pid_t pid;
1984 int r;
1985
1986 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1987 if (r < 0)
1988 goto fail;
1989
1990 /* We have to resolve the user names out-of-process, hence
1991 * let's fork here. It's messy, but well, what can we do? */
1992
1993 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1994 if (r < 0)
1995 return r;
1996 if (r == 0) {
1997 uid_t uid = UID_INVALID;
1998 gid_t gid = GID_INVALID;
1999
2000 /* Child */
2001
2002 if (!isempty(s->user)) {
2003 const char *user = s->user;
2004
2005 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
2006 if (r < 0) {
2007 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2008 _exit(EXIT_USER);
2009 }
2010 }
2011
2012 if (!isempty(s->group)) {
2013 const char *group = s->group;
2014
2015 r = get_group_creds(&group, &gid, 0);
2016 if (r < 0) {
2017 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2018 _exit(EXIT_GROUP);
2019 }
2020 }
2021
2022 LIST_FOREACH(port, p, s->ports) {
2023 const char *path = NULL;
2024
2025 if (p->type == SOCKET_SOCKET)
2026 path = socket_address_get_path(&p->address);
2027 else if (p->type == SOCKET_FIFO)
2028 path = p->path;
2029
2030 if (!path)
2031 continue;
2032
2033 if (chown(path, uid, gid) < 0) {
2034 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2035 _exit(EXIT_CHOWN);
2036 }
2037 }
2038
2039 _exit(EXIT_SUCCESS);
2040 }
2041
2042 r = unit_watch_pid(UNIT(s), pid, true);
2043 if (r < 0)
2044 goto fail;
2045
2046 *_pid = pid;
2047 return 0;
2048
2049 fail:
2050 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2051 return r;
2052 }
2053
2054 static void socket_enter_dead(Socket *s, SocketResult f) {
2055 assert(s);
2056
2057 if (s->result == SOCKET_SUCCESS)
2058 s->result = f;
2059
2060 if (s->result == SOCKET_SUCCESS)
2061 unit_log_success(UNIT(s));
2062 else
2063 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2064
2065 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2066
2067 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2068
2069 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2070
2071 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2072
2073 unit_unref_uid_gid(UNIT(s), true);
2074 }
2075
2076 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2077
2078 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2079 int r;
2080 assert(s);
2081
2082 if (s->result == SOCKET_SUCCESS)
2083 s->result = f;
2084
2085 socket_unwatch_control_pid(s);
2086 s->control_command_id = SOCKET_EXEC_STOP_POST;
2087 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2088
2089 if (s->control_command) {
2090 r = socket_spawn(s, s->control_command, &s->control_pid);
2091 if (r < 0)
2092 goto fail;
2093
2094 socket_set_state(s, SOCKET_STOP_POST);
2095 } else
2096 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2097
2098 return;
2099
2100 fail:
2101 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2102 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2103 }
2104
2105 static int state_to_kill_operation(Socket *s, SocketState state) {
2106 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2107 return KILL_RESTART;
2108
2109 if (state == SOCKET_FINAL_SIGTERM)
2110 return KILL_TERMINATE;
2111
2112 return KILL_KILL;
2113 }
2114
2115 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2116 int r;
2117
2118 assert(s);
2119
2120 if (s->result == SOCKET_SUCCESS)
2121 s->result = f;
2122
2123 r = unit_kill_context(
2124 UNIT(s),
2125 &s->kill_context,
2126 state_to_kill_operation(s, state),
2127 -1,
2128 s->control_pid,
2129 false);
2130 if (r < 0)
2131 goto fail;
2132
2133 if (r > 0) {
2134 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2135 if (r < 0)
2136 goto fail;
2137
2138 socket_set_state(s, state);
2139 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2140 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2141 else if (state == SOCKET_STOP_PRE_SIGKILL)
2142 socket_enter_stop_post(s, SOCKET_SUCCESS);
2143 else if (state == SOCKET_FINAL_SIGTERM)
2144 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2145 else
2146 socket_enter_dead(s, SOCKET_SUCCESS);
2147
2148 return;
2149
2150 fail:
2151 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2152
2153 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2154 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2155 else
2156 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2157 }
2158
2159 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2160 int r;
2161 assert(s);
2162
2163 if (s->result == SOCKET_SUCCESS)
2164 s->result = f;
2165
2166 socket_unwatch_control_pid(s);
2167 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2168 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2169
2170 if (s->control_command) {
2171 r = socket_spawn(s, s->control_command, &s->control_pid);
2172 if (r < 0)
2173 goto fail;
2174
2175 socket_set_state(s, SOCKET_STOP_PRE);
2176 } else
2177 socket_enter_stop_post(s, SOCKET_SUCCESS);
2178
2179 return;
2180
2181 fail:
2182 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2183 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2184 }
2185
2186 static void socket_enter_listening(Socket *s) {
2187 int r;
2188 assert(s);
2189
2190 if (!s->accept && s->flush_pending) {
2191 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2192 flush_ports(s);
2193 }
2194
2195 r = socket_watch_fds(s);
2196 if (r < 0) {
2197 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2198 goto fail;
2199 }
2200
2201 socket_set_state(s, SOCKET_LISTENING);
2202 return;
2203
2204 fail:
2205 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2206 }
2207
2208 static void socket_enter_start_post(Socket *s) {
2209 int r;
2210 assert(s);
2211
2212 socket_unwatch_control_pid(s);
2213 s->control_command_id = SOCKET_EXEC_START_POST;
2214 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2215
2216 if (s->control_command) {
2217 r = socket_spawn(s, s->control_command, &s->control_pid);
2218 if (r < 0) {
2219 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2220 goto fail;
2221 }
2222
2223 socket_set_state(s, SOCKET_START_POST);
2224 } else
2225 socket_enter_listening(s);
2226
2227 return;
2228
2229 fail:
2230 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2231 }
2232
2233 static void socket_enter_start_chown(Socket *s) {
2234 int r;
2235
2236 assert(s);
2237
2238 r = socket_open_fds(s);
2239 if (r < 0) {
2240 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2241 goto fail;
2242 }
2243
2244 if (!isempty(s->user) || !isempty(s->group)) {
2245
2246 socket_unwatch_control_pid(s);
2247 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2248 s->control_command = NULL;
2249
2250 r = socket_chown(s, &s->control_pid);
2251 if (r < 0) {
2252 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2253 goto fail;
2254 }
2255
2256 socket_set_state(s, SOCKET_START_CHOWN);
2257 } else
2258 socket_enter_start_post(s);
2259
2260 return;
2261
2262 fail:
2263 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2264 }
2265
2266 static void socket_enter_start_pre(Socket *s) {
2267 int r;
2268 assert(s);
2269
2270 socket_unwatch_control_pid(s);
2271
2272 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2273
2274 s->control_command_id = SOCKET_EXEC_START_PRE;
2275 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2276
2277 if (s->control_command) {
2278 r = socket_spawn(s, s->control_command, &s->control_pid);
2279 if (r < 0) {
2280 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2281 goto fail;
2282 }
2283
2284 socket_set_state(s, SOCKET_START_PRE);
2285 } else
2286 socket_enter_start_chown(s);
2287
2288 return;
2289
2290 fail:
2291 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2292 }
2293
2294 static void flush_ports(Socket *s) {
2295 assert(s);
2296
2297 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2298 * anymore */
2299
2300 LIST_FOREACH(port, p, s->ports) {
2301 if (p->fd < 0)
2302 continue;
2303
2304 (void) flush_accept(p->fd);
2305 (void) flush_fd(p->fd);
2306 }
2307 }
2308
2309 static void socket_enter_running(Socket *s, int cfd_in) {
2310 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2311 * somewhere or close it. */
2312 _cleanup_close_ int cfd = cfd_in;
2313
2314 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2315 int r;
2316
2317 assert(s);
2318
2319 /* We don't take connections anymore if we are supposed to shut down anyway */
2320 if (unit_stop_pending(UNIT(s))) {
2321
2322 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2323
2324 if (cfd >= 0)
2325 goto refuse;
2326
2327 flush_ports(s);
2328 return;
2329 }
2330
2331 if (!ratelimit_below(&s->trigger_limit)) {
2332 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2333 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2334 goto refuse;
2335 }
2336
2337 if (cfd < 0) {
2338 bool pending = false;
2339 Unit *other;
2340
2341 /* If there's already a start pending don't bother to do anything */
2342 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2343 if (unit_active_or_pending(other)) {
2344 pending = true;
2345 break;
2346 }
2347
2348 if (!pending) {
2349 if (!UNIT_ISSET(s->service)) {
2350 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2351 "Service to activate vanished, refusing activation.");
2352 goto fail;
2353 }
2354
2355 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2356 if (r < 0)
2357 goto fail;
2358 }
2359
2360 socket_set_state(s, SOCKET_RUNNING);
2361 } else {
2362 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2363 Unit *service;
2364
2365 if (s->n_connections >= s->max_connections) {
2366 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2367 s->n_connections);
2368 goto refuse;
2369 }
2370
2371 if (s->max_connections_per_source > 0) {
2372 r = socket_acquire_peer(s, cfd, &p);
2373 if (r < 0) {
2374 if (ERRNO_IS_DISCONNECT(r))
2375 return;
2376 /* We didn't have enough resources to acquire peer information, let's fail. */
2377 goto fail;
2378 }
2379 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2380 _cleanup_free_ char *t = NULL;
2381
2382 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2383
2384 log_unit_warning(UNIT(s),
2385 "Too many incoming connections (%u) from source %s, dropping connection.",
2386 p->n_ref, strnull(t));
2387 goto refuse;
2388 }
2389 }
2390
2391 r = socket_load_service_unit(s, cfd, &service);
2392 if (ERRNO_IS_DISCONNECT(r))
2393 return;
2394 if (r < 0)
2395 goto fail;
2396
2397 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2398 false, UNIT_DEPENDENCY_IMPLICIT);
2399 if (r < 0)
2400 goto fail;
2401
2402 s->n_accepted++;
2403
2404 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2405 if (ERRNO_IS_DISCONNECT(r))
2406 return;
2407 if (r < 0)
2408 goto fail;
2409
2410 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2411 s->n_connections++;
2412
2413 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2414 if (r < 0) {
2415 /* We failed to activate the new service, but it still exists. Let's make sure the
2416 * service closes and forgets the connection fd again, immediately. */
2417 service_release_socket_fd(SERVICE(service));
2418 goto fail;
2419 }
2420
2421 /* Notify clients about changed counters */
2422 unit_add_to_dbus_queue(UNIT(s));
2423 }
2424
2425 TAKE_FD(cfd);
2426 return;
2427
2428 refuse:
2429 s->n_refused++;
2430 return;
2431
2432 fail:
2433 if (ERRNO_IS_RESOURCE(r))
2434 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2435 bus_error_message(&error, r));
2436 else
2437 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2438 cfd >= 0 ? "template" : "non-template",
2439 bus_error_message(&error, r));
2440
2441 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2442 }
2443
2444 static void socket_run_next(Socket *s) {
2445 int r;
2446
2447 assert(s);
2448 assert(s->control_command);
2449 assert(s->control_command->command_next);
2450
2451 socket_unwatch_control_pid(s);
2452
2453 s->control_command = s->control_command->command_next;
2454
2455 r = socket_spawn(s, s->control_command, &s->control_pid);
2456 if (r < 0)
2457 goto fail;
2458
2459 return;
2460
2461 fail:
2462 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2463
2464 if (s->state == SOCKET_START_POST)
2465 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2466 else if (s->state == SOCKET_STOP_POST)
2467 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2468 else
2469 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2470 }
2471
2472 static int socket_start(Unit *u) {
2473 Socket *s = SOCKET(u);
2474 int r;
2475
2476 assert(s);
2477
2478 /* We cannot fulfill this request right now, try again later
2479 * please! */
2480 if (IN_SET(s->state,
2481 SOCKET_STOP_PRE,
2482 SOCKET_STOP_PRE_SIGKILL,
2483 SOCKET_STOP_PRE_SIGTERM,
2484 SOCKET_STOP_POST,
2485 SOCKET_FINAL_SIGTERM,
2486 SOCKET_FINAL_SIGKILL,
2487 SOCKET_CLEANING))
2488 return -EAGAIN;
2489
2490 /* Already on it! */
2491 if (IN_SET(s->state,
2492 SOCKET_START_PRE,
2493 SOCKET_START_CHOWN,
2494 SOCKET_START_POST))
2495 return 0;
2496
2497 /* Cannot run this without the service being around */
2498 if (UNIT_ISSET(s->service)) {
2499 Service *service;
2500
2501 service = SERVICE(UNIT_DEREF(s->service));
2502
2503 if (UNIT(service)->load_state != UNIT_LOADED)
2504 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT), "Socket service %s not loaded, refusing.", UNIT(service)->id);
2505
2506 /* If the service is already active we cannot start the
2507 * socket */
2508 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED_BEFORE_AUTO_RESTART, SERVICE_AUTO_RESTART))
2509 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Socket service %s already active, refusing.", UNIT(service)->id);
2510 }
2511
2512 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2513
2514 r = unit_acquire_invocation_id(u);
2515 if (r < 0)
2516 return r;
2517
2518 s->result = SOCKET_SUCCESS;
2519 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2520
2521 u->reset_accounting = true;
2522
2523 socket_enter_start_pre(s);
2524 return 1;
2525 }
2526
2527 static int socket_stop(Unit *u) {
2528 Socket *s = SOCKET(u);
2529
2530 assert(s);
2531
2532 /* Already on it */
2533 if (IN_SET(s->state,
2534 SOCKET_STOP_PRE,
2535 SOCKET_STOP_PRE_SIGTERM,
2536 SOCKET_STOP_PRE_SIGKILL,
2537 SOCKET_STOP_POST,
2538 SOCKET_FINAL_SIGTERM,
2539 SOCKET_FINAL_SIGKILL))
2540 return 0;
2541
2542 /* If there's already something running we go directly into
2543 * kill mode. */
2544 if (IN_SET(s->state,
2545 SOCKET_START_PRE,
2546 SOCKET_START_CHOWN,
2547 SOCKET_START_POST)) {
2548 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2549 return -EAGAIN;
2550 }
2551
2552 /* If we are currently cleaning, then abort it, brutally. */
2553 if (s->state == SOCKET_CLEANING) {
2554 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2555 return 0;
2556 }
2557
2558 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2559
2560 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2561 return 1;
2562 }
2563
2564 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2565 Socket *s = SOCKET(u);
2566 int r;
2567
2568 assert(u);
2569 assert(f);
2570 assert(fds);
2571
2572 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2573 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2574 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2575 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2576
2577 if (s->control_pid > 0)
2578 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2579
2580 if (s->control_command_id >= 0)
2581 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2582
2583 LIST_FOREACH(port, p, s->ports) {
2584 int copy;
2585
2586 if (p->fd < 0)
2587 continue;
2588
2589 copy = fdset_put_dup(fds, p->fd);
2590 if (copy < 0)
2591 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2592
2593 if (p->type == SOCKET_SOCKET) {
2594 _cleanup_free_ char *t = NULL;
2595
2596 r = socket_address_print(&p->address, &t);
2597 if (r < 0)
2598 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2599
2600 if (socket_address_family(&p->address) == AF_NETLINK)
2601 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2602 else
2603 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2604 } else if (p->type == SOCKET_SPECIAL)
2605 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2606 else if (p->type == SOCKET_MQUEUE)
2607 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2608 else if (p->type == SOCKET_USB_FUNCTION)
2609 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2610 else {
2611 assert(p->type == SOCKET_FIFO);
2612 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2613 }
2614 }
2615
2616 return 0;
2617 }
2618
2619 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2620 Socket *s = SOCKET(u);
2621 int r;
2622
2623 assert(u);
2624 assert(key);
2625 assert(value);
2626
2627 if (streq(key, "state")) {
2628 SocketState state;
2629
2630 state = socket_state_from_string(value);
2631 if (state < 0)
2632 log_unit_debug(u, "Failed to parse state value: %s", value);
2633 else
2634 s->deserialized_state = state;
2635 } else if (streq(key, "result")) {
2636 SocketResult f;
2637
2638 f = socket_result_from_string(value);
2639 if (f < 0)
2640 log_unit_debug(u, "Failed to parse result value: %s", value);
2641 else if (f != SOCKET_SUCCESS)
2642 s->result = f;
2643
2644 } else if (streq(key, "n-accepted")) {
2645 unsigned k;
2646
2647 if (safe_atou(value, &k) < 0)
2648 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2649 else
2650 s->n_accepted += k;
2651 } else if (streq(key, "n-refused")) {
2652 unsigned k;
2653
2654 if (safe_atou(value, &k) < 0)
2655 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2656 else
2657 s->n_refused += k;
2658 } else if (streq(key, "control-pid")) {
2659 pid_t pid;
2660
2661 if (parse_pid(value, &pid) < 0)
2662 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2663 else
2664 s->control_pid = pid;
2665 } else if (streq(key, "control-command")) {
2666 SocketExecCommand id;
2667
2668 id = socket_exec_command_from_string(value);
2669 if (id < 0)
2670 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2671 else {
2672 s->control_command_id = id;
2673 s->control_command = s->exec_command[id];
2674 }
2675 } else if (streq(key, "fifo")) {
2676 _cleanup_free_ char *fdv = NULL;
2677 bool found = false;
2678 int fd;
2679
2680 r = extract_first_word(&value, &fdv, NULL, 0);
2681 if (r <= 0) {
2682 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2683 return 0;
2684 }
2685
2686 fd = parse_fd(fdv);
2687 if (fd < 0 || !fdset_contains(fds, fd)) {
2688 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2689 return 0;
2690 }
2691
2692 LIST_FOREACH(port, p, s->ports)
2693 if (p->fd < 0 &&
2694 p->type == SOCKET_FIFO &&
2695 path_equal_or_inode_same(p->path, value, 0)) {
2696 p->fd = fdset_remove(fds, fd);
2697 found = true;
2698 break;
2699 }
2700 if (!found)
2701 log_unit_debug(u, "No matching fifo socket found: %s", value);
2702
2703 } else if (streq(key, "special")) {
2704 _cleanup_free_ char *fdv = NULL;
2705 bool found = false;
2706 int fd;
2707
2708 r = extract_first_word(&value, &fdv, NULL, 0);
2709 if (r <= 0) {
2710 log_unit_debug(u, "Failed to parse special value: %s", value);
2711 return 0;
2712 }
2713
2714 fd = parse_fd(fdv);
2715 if (fd < 0 || !fdset_contains(fds, fd)) {
2716 log_unit_debug(u, "Invalid special value: %s", fdv);
2717 return 0;
2718 }
2719
2720 LIST_FOREACH(port, p, s->ports)
2721 if (p->fd < 0 &&
2722 p->type == SOCKET_SPECIAL &&
2723 path_equal_or_inode_same(p->path, value, 0)) {
2724 p->fd = fdset_remove(fds, fd);
2725 found = true;
2726 break;
2727 }
2728 if (!found)
2729 log_unit_debug(u, "No matching special socket found: %s", value);
2730
2731 } else if (streq(key, "mqueue")) {
2732 _cleanup_free_ char *fdv = NULL;
2733 bool found = false;
2734 int fd;
2735
2736 r = extract_first_word(&value, &fdv, NULL, 0);
2737 if (r <= 0) {
2738 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2739 return 0;
2740 }
2741
2742 fd = parse_fd(fdv);
2743 if (fd < 0 || !fdset_contains(fds, fd)) {
2744 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2745 return 0;
2746 }
2747
2748 LIST_FOREACH(port, p, s->ports)
2749 if (p->fd < 0 &&
2750 p->type == SOCKET_MQUEUE &&
2751 streq(p->path, value)) {
2752 p->fd = fdset_remove(fds, fd);
2753 found = true;
2754 break;
2755 }
2756 if (!found)
2757 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2758
2759 } else if (streq(key, "socket")) {
2760 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2761 bool found = false;
2762 int fd, type;
2763
2764 r = extract_first_word(&value, &fdv, NULL, 0);
2765 if (r <= 0) {
2766 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2767 return 0;
2768 }
2769
2770 fd = parse_fd(fdv);
2771 if (fd < 0 || !fdset_contains(fds, fd)) {
2772 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2773 return 0;
2774 }
2775
2776 r = extract_first_word(&value, &typev, NULL, 0);
2777 if (r <= 0) {
2778 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2779 return 0;
2780 }
2781
2782 if (safe_atoi(typev, &type) < 0 || type < 0) {
2783 log_unit_debug(u, "Invalid socket type: %s", typev);
2784 return 0;
2785 }
2786
2787 LIST_FOREACH(port, p, s->ports)
2788 if (p->fd < 0 &&
2789 socket_address_is(&p->address, value, type)) {
2790 p->fd = fdset_remove(fds, fd);
2791 found = true;
2792 break;
2793 }
2794 if (!found)
2795 log_unit_debug(u, "No matching %s socket found: %s",
2796 socket_address_type_to_string(type), value);
2797
2798 } else if (streq(key, "netlink")) {
2799 _cleanup_free_ char *fdv = NULL;
2800 bool found = false;
2801 int fd;
2802
2803 r = extract_first_word(&value, &fdv, NULL, 0);
2804 if (r <= 0) {
2805 log_unit_debug(u, "Failed to parse socket value: %s", value);
2806 return 0;
2807 }
2808
2809 fd = parse_fd(fdv);
2810 if (fd < 0 || !fdset_contains(fds, fd)) {
2811 log_unit_debug(u, "Invalid socket value: %s", fdv);
2812 return 0;
2813 }
2814
2815 LIST_FOREACH(port, p, s->ports)
2816 if (p->fd < 0 &&
2817 socket_address_is_netlink(&p->address, value)) {
2818 p->fd = fdset_remove(fds, fd);
2819 found = true;
2820 break;
2821 }
2822 if (!found)
2823 log_unit_debug(u, "No matching netlink socket found: %s", value);
2824
2825 } else if (streq(key, "ffs")) {
2826 _cleanup_free_ char *fdv = NULL;
2827 bool found = false;
2828 int fd;
2829
2830 r = extract_first_word(&value, &fdv, NULL, 0);
2831 if (r <= 0) {
2832 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2833 return 0;
2834 }
2835
2836 fd = parse_fd(fdv);
2837 if (fd < 0 || !fdset_contains(fds, fd)) {
2838 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2839 return 0;
2840 }
2841
2842 LIST_FOREACH(port, p, s->ports)
2843 if (p->fd < 0 &&
2844 p->type == SOCKET_USB_FUNCTION &&
2845 path_equal_or_inode_same(p->path, value, 0)) {
2846 p->fd = fdset_remove(fds, fd);
2847 found = true;
2848 break;
2849 }
2850 if (!found)
2851 log_unit_debug(u, "No matching ffs socket found: %s", value);
2852
2853 } else
2854 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2855
2856 return 0;
2857 }
2858
2859 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2860 Socket *s = SOCKET(u);
2861
2862 assert(u);
2863
2864 LIST_FOREACH(port, p, s->ports) {
2865 int fd;
2866
2867 if (p->type != SOCKET_SOCKET)
2868 continue;
2869
2870 if (p->fd >= 0)
2871 continue;
2872
2873 FDSET_FOREACH(fd, fds) {
2874 if (socket_address_matches_fd(&p->address, fd)) {
2875 p->fd = fdset_remove(fds, fd);
2876 s->deserialized_state = SOCKET_LISTENING;
2877 break;
2878 }
2879 }
2880 }
2881 }
2882
2883 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2884 assert(u);
2885
2886 return state_translation_table[SOCKET(u)->state];
2887 }
2888
2889 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2890 assert(u);
2891
2892 return socket_state_to_string(SOCKET(u)->state);
2893 }
2894
2895 const char* socket_port_type_to_string(SocketPort *p) {
2896
2897 assert(p);
2898
2899 switch (p->type) {
2900
2901 case SOCKET_SOCKET:
2902
2903 switch (p->address.type) {
2904
2905 case SOCK_STREAM:
2906 return "Stream";
2907
2908 case SOCK_DGRAM:
2909 return "Datagram";
2910
2911 case SOCK_SEQPACKET:
2912 return "SequentialPacket";
2913
2914 case SOCK_RAW:
2915 if (socket_address_family(&p->address) == AF_NETLINK)
2916 return "Netlink";
2917
2918 _fallthrough_;
2919 default:
2920 return NULL;
2921 }
2922
2923 case SOCKET_SPECIAL:
2924 return "Special";
2925
2926 case SOCKET_MQUEUE:
2927 return "MessageQueue";
2928
2929 case SOCKET_FIFO:
2930 return "FIFO";
2931
2932 case SOCKET_USB_FUNCTION:
2933 return "USBFunction";
2934
2935 default:
2936 return NULL;
2937 }
2938 }
2939
2940 SocketType socket_port_type_from_string(const char *s) {
2941 assert(s);
2942
2943 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2944 return SOCKET_SOCKET;
2945 else if (streq(s, "Special"))
2946 return SOCKET_SPECIAL;
2947 else if (streq(s, "MessageQueue"))
2948 return SOCKET_MQUEUE;
2949 else if (streq(s, "FIFO"))
2950 return SOCKET_FIFO;
2951 else if (streq(s, "USBFunction"))
2952 return SOCKET_USB_FUNCTION;
2953 else
2954 return _SOCKET_TYPE_INVALID;
2955 }
2956
2957 _pure_ static bool socket_may_gc(Unit *u) {
2958 Socket *s = SOCKET(u);
2959
2960 assert(u);
2961
2962 return s->n_connections == 0;
2963 }
2964
2965 static int socket_accept_do(Socket *s, int fd) {
2966 int cfd;
2967
2968 assert(s);
2969 assert(fd >= 0);
2970
2971 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2972 if (cfd < 0)
2973 /* Convert transient network errors into clean and well-defined EAGAIN */
2974 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2975
2976 return cfd;
2977 }
2978
2979 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2980 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2981 int cfd, r;
2982 pid_t pid;
2983
2984 assert(s);
2985 assert(p);
2986 assert(fd >= 0);
2987
2988 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2989 * connection socket is also properly associated with the cgroup. */
2990
2991 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2992 goto shortcut;
2993
2994 r = bpf_firewall_supported();
2995 if (r < 0)
2996 return r;
2997 if (r == BPF_FIREWALL_UNSUPPORTED)
2998 goto shortcut;
2999
3000 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
3001 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
3002
3003 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
3004 if (r < 0)
3005 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
3006 if (r == 0) {
3007 /* Child */
3008
3009 pair[0] = safe_close(pair[0]);
3010
3011 cfd = socket_accept_do(s, fd);
3012 if (cfd == -EAGAIN) /* spurious accept() */
3013 _exit(EXIT_SUCCESS);
3014 if (cfd < 0) {
3015 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3016 _exit(EXIT_FAILURE);
3017 }
3018
3019 r = send_one_fd(pair[1], cfd, 0);
3020 if (r < 0) {
3021 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3022 _exit(EXIT_FAILURE);
3023 }
3024
3025 _exit(EXIT_SUCCESS);
3026 }
3027
3028 pair[1] = safe_close(pair[1]);
3029 cfd = receive_one_fd(pair[0], 0);
3030
3031 /* We synchronously wait for the helper, as it shouldn't be slow */
3032 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3033 if (r < 0) {
3034 safe_close(cfd);
3035 return r;
3036 }
3037
3038 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3039 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3040 if (cfd == -EIO)
3041 return -EAGAIN;
3042 if (cfd < 0)
3043 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3044
3045 return cfd;
3046
3047 shortcut:
3048 cfd = socket_accept_do(s, fd);
3049 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3050 return -EAGAIN;
3051 if (cfd < 0)
3052 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3053
3054 return cfd;
3055 }
3056
3057 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3058 SocketPort *p = ASSERT_PTR(userdata);
3059 int cfd = -EBADF;
3060
3061 assert(fd >= 0);
3062
3063 if (p->socket->state != SOCKET_LISTENING)
3064 return 0;
3065
3066 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3067
3068 if (revents != EPOLLIN) {
3069 if (revents & EPOLLHUP)
3070 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.");
3071 else
3072 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3073 goto fail;
3074 }
3075
3076 if (p->socket->accept &&
3077 p->type == SOCKET_SOCKET &&
3078 socket_address_can_accept(&p->address)) {
3079
3080 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3081 if (cfd == -EAGAIN) /* Spurious accept() */
3082 return 0;
3083 if (cfd < 0)
3084 goto fail;
3085
3086 socket_apply_socket_options(p->socket, p, cfd);
3087 }
3088
3089 socket_enter_running(p->socket, cfd);
3090 return 0;
3091
3092 fail:
3093 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3094 return 0;
3095 }
3096
3097 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3098 Socket *s = SOCKET(u);
3099 SocketResult f;
3100
3101 assert(s);
3102 assert(pid >= 0);
3103
3104 if (pid != s->control_pid)
3105 return;
3106
3107 s->control_pid = 0;
3108
3109 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3110 f = SOCKET_SUCCESS;
3111 else if (code == CLD_EXITED)
3112 f = SOCKET_FAILURE_EXIT_CODE;
3113 else if (code == CLD_KILLED)
3114 f = SOCKET_FAILURE_SIGNAL;
3115 else if (code == CLD_DUMPED)
3116 f = SOCKET_FAILURE_CORE_DUMP;
3117 else
3118 assert_not_reached();
3119
3120 if (s->control_command) {
3121 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3122
3123 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3124 f = SOCKET_SUCCESS;
3125 }
3126
3127 unit_log_process_exit(
3128 u,
3129 "Control process",
3130 socket_exec_command_to_string(s->control_command_id),
3131 f == SOCKET_SUCCESS,
3132 code, status);
3133
3134 if (s->result == SOCKET_SUCCESS)
3135 s->result = f;
3136
3137 if (s->control_command &&
3138 s->control_command->command_next &&
3139 f == SOCKET_SUCCESS) {
3140
3141 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3142 socket_run_next(s);
3143 } else {
3144 s->control_command = NULL;
3145 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3146
3147 /* No further commands for this step, so let's figure
3148 * out what to do next */
3149
3150 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3151
3152 switch (s->state) {
3153
3154 case SOCKET_START_PRE:
3155 if (f == SOCKET_SUCCESS)
3156 socket_enter_start_chown(s);
3157 else
3158 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3159 break;
3160
3161 case SOCKET_START_CHOWN:
3162 if (f == SOCKET_SUCCESS)
3163 socket_enter_start_post(s);
3164 else
3165 socket_enter_stop_pre(s, f);
3166 break;
3167
3168 case SOCKET_START_POST:
3169 if (f == SOCKET_SUCCESS)
3170 socket_enter_listening(s);
3171 else
3172 socket_enter_stop_pre(s, f);
3173 break;
3174
3175 case SOCKET_STOP_PRE:
3176 case SOCKET_STOP_PRE_SIGTERM:
3177 case SOCKET_STOP_PRE_SIGKILL:
3178 socket_enter_stop_post(s, f);
3179 break;
3180
3181 case SOCKET_STOP_POST:
3182 case SOCKET_FINAL_SIGTERM:
3183 case SOCKET_FINAL_SIGKILL:
3184 socket_enter_dead(s, f);
3185 break;
3186
3187 case SOCKET_CLEANING:
3188
3189 if (s->clean_result == SOCKET_SUCCESS)
3190 s->clean_result = f;
3191
3192 socket_enter_dead(s, SOCKET_SUCCESS);
3193 break;
3194
3195 default:
3196 assert_not_reached();
3197 }
3198 }
3199
3200 /* Notify clients about changed exit status */
3201 unit_add_to_dbus_queue(u);
3202 }
3203
3204 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3205 Socket *s = SOCKET(userdata);
3206
3207 assert(s);
3208 assert(s->timer_event_source == source);
3209
3210 switch (s->state) {
3211
3212 case SOCKET_START_PRE:
3213 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3214 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3215 break;
3216
3217 case SOCKET_START_CHOWN:
3218 case SOCKET_START_POST:
3219 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3220 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3221 break;
3222
3223 case SOCKET_STOP_PRE:
3224 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3225 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3226 break;
3227
3228 case SOCKET_STOP_PRE_SIGTERM:
3229 if (s->kill_context.send_sigkill) {
3230 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3231 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3232 } else {
3233 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3234 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3235 }
3236 break;
3237
3238 case SOCKET_STOP_PRE_SIGKILL:
3239 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3240 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3241 break;
3242
3243 case SOCKET_STOP_POST:
3244 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3245 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3246 break;
3247
3248 case SOCKET_FINAL_SIGTERM:
3249 if (s->kill_context.send_sigkill) {
3250 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3251 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3252 } else {
3253 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3254 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3255 }
3256 break;
3257
3258 case SOCKET_FINAL_SIGKILL:
3259 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3260 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3261 break;
3262
3263 case SOCKET_CLEANING:
3264 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3265
3266 if (s->clean_result == SOCKET_SUCCESS)
3267 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3268
3269 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3270 break;
3271
3272 default:
3273 assert_not_reached();
3274 }
3275
3276 return 0;
3277 }
3278
3279 int socket_collect_fds(Socket *s, int **fds) {
3280 size_t k = 0, n = 0;
3281 int *rfds;
3282
3283 assert(s);
3284 assert(fds);
3285
3286 /* Called from the service code for requesting our fds */
3287
3288 LIST_FOREACH(port, p, s->ports) {
3289 if (p->fd >= 0)
3290 n++;
3291 n += p->n_auxiliary_fds;
3292 }
3293
3294 if (n <= 0) {
3295 *fds = NULL;
3296 return 0;
3297 }
3298
3299 rfds = new(int, n);
3300 if (!rfds)
3301 return -ENOMEM;
3302
3303 LIST_FOREACH(port, p, s->ports) {
3304 if (p->fd >= 0)
3305 rfds[k++] = p->fd;
3306 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3307 rfds[k++] = p->auxiliary_fds[i];
3308 }
3309
3310 assert(k == n);
3311
3312 *fds = rfds;
3313 return (int) n;
3314 }
3315
3316 static void socket_reset_failed(Unit *u) {
3317 Socket *s = SOCKET(u);
3318
3319 assert(s);
3320
3321 if (s->state == SOCKET_FAILED)
3322 socket_set_state(s, SOCKET_DEAD);
3323
3324 s->result = SOCKET_SUCCESS;
3325 s->clean_result = SOCKET_SUCCESS;
3326 }
3327
3328 void socket_connection_unref(Socket *s) {
3329 assert(s);
3330
3331 /* The service is dead. Yay!
3332 *
3333 * This is strictly for one-instance-per-connection
3334 * services. */
3335
3336 assert(s->n_connections > 0);
3337 s->n_connections--;
3338
3339 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3340 }
3341
3342 static void socket_trigger_notify(Unit *u, Unit *other) {
3343 Socket *s = SOCKET(u);
3344
3345 assert(u);
3346 assert(other);
3347
3348 /* Filter out invocations with bogus state */
3349 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3350 assert(other->type == UNIT_SERVICE);
3351
3352 /* Don't propagate state changes from the service if we are already down */
3353 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3354 return;
3355
3356 /* We don't care for the service state if we are in Accept=yes mode */
3357 if (s->accept)
3358 return;
3359
3360 /* Propagate start limit hit state */
3361 if (other->start_limit_hit) {
3362 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3363 return;
3364 }
3365
3366 /* Don't propagate anything if there's still a job queued */
3367 if (other->job)
3368 return;
3369
3370 if (IN_SET(SERVICE(other)->state,
3371 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3372 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3373 SERVICE_AUTO_RESTART))
3374 socket_enter_listening(s);
3375
3376 if (SERVICE(other)->state == SERVICE_RUNNING)
3377 socket_set_state(s, SOCKET_RUNNING);
3378 }
3379
3380 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3381 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid, error);
3382 }
3383
3384 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3385 Socket *s = SOCKET(u);
3386 usec_t t;
3387 int r;
3388
3389 if (!s->timer_event_source)
3390 return 0;
3391
3392 r = sd_event_source_get_time(s->timer_event_source, &t);
3393 if (r < 0)
3394 return r;
3395 if (t == USEC_INFINITY)
3396 return 0;
3397
3398 *timeout = t;
3399 return 1;
3400 }
3401
3402 char *socket_fdname(Socket *s) {
3403 assert(s);
3404
3405 /* Returns the name to use for $LISTEN_NAMES. If the user
3406 * didn't specify anything specifically, use the socket unit's
3407 * name as fallback. */
3408
3409 return s->fdname ?: UNIT(s)->id;
3410 }
3411
3412 static int socket_control_pid(Unit *u) {
3413 Socket *s = SOCKET(u);
3414
3415 assert(s);
3416
3417 return s->control_pid;
3418 }
3419
3420 static int socket_clean(Unit *u, ExecCleanMask mask) {
3421 _cleanup_strv_free_ char **l = NULL;
3422 Socket *s = SOCKET(u);
3423 int r;
3424
3425 assert(s);
3426 assert(mask != 0);
3427
3428 if (s->state != SOCKET_DEAD)
3429 return -EBUSY;
3430
3431 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3432 if (r < 0)
3433 return r;
3434
3435 if (strv_isempty(l))
3436 return -EUNATCH;
3437
3438 socket_unwatch_control_pid(s);
3439 s->clean_result = SOCKET_SUCCESS;
3440 s->control_command = NULL;
3441 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3442
3443 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3444 if (r < 0)
3445 goto fail;
3446
3447 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3448 if (r < 0)
3449 goto fail;
3450
3451 socket_set_state(s, SOCKET_CLEANING);
3452
3453 return 0;
3454
3455 fail:
3456 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3457 s->clean_result = SOCKET_FAILURE_RESOURCES;
3458 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3459 return r;
3460 }
3461
3462 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3463 Socket *s = SOCKET(u);
3464
3465 assert(s);
3466
3467 return exec_context_get_clean_mask(&s->exec_context, ret);
3468 }
3469
3470 static int socket_can_start(Unit *u) {
3471 Socket *s = SOCKET(u);
3472 int r;
3473
3474 assert(s);
3475
3476 r = unit_test_start_limit(u);
3477 if (r < 0) {
3478 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3479 return r;
3480 }
3481
3482 return 1;
3483 }
3484
3485 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3486 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3487 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3488 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3489 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3490 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3491 };
3492
3493 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3494
3495 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3496 [SOCKET_SUCCESS] = "success",
3497 [SOCKET_FAILURE_RESOURCES] = "resources",
3498 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3499 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3500 [SOCKET_FAILURE_SIGNAL] = "signal",
3501 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3502 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3503 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3504 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3505 };
3506
3507 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3508
3509 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3510 [SOCKET_TIMESTAMPING_OFF] = "off",
3511 [SOCKET_TIMESTAMPING_US] = "us",
3512 [SOCKET_TIMESTAMPING_NS] = "ns",
3513 };
3514
3515 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3516
3517 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3518 SocketTimestamping t;
3519 int r;
3520
3521 if (!p)
3522 return _SOCKET_TIMESTAMPING_INVALID;
3523
3524 t = socket_timestamping_from_string(p);
3525 if (t >= 0)
3526 return t;
3527
3528 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3529 * too. */
3530 if (streq(p, "nsec"))
3531 return SOCKET_TIMESTAMPING_NS;
3532 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3533 return SOCKET_TIMESTAMPING_US;
3534
3535 r = parse_boolean(p);
3536 if (r < 0)
3537 return _SOCKET_TIMESTAMPING_INVALID;
3538
3539 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3540 }
3541
3542 const UnitVTable socket_vtable = {
3543 .object_size = sizeof(Socket),
3544 .exec_context_offset = offsetof(Socket, exec_context),
3545 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3546 .kill_context_offset = offsetof(Socket, kill_context),
3547 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3548
3549 .sections =
3550 "Unit\0"
3551 "Socket\0"
3552 "Install\0",
3553 .private_section = "Socket",
3554
3555 .can_transient = true,
3556 .can_trigger = true,
3557 .can_fail = true,
3558
3559 .init = socket_init,
3560 .done = socket_done,
3561 .load = socket_load,
3562
3563 .coldplug = socket_coldplug,
3564
3565 .dump = socket_dump,
3566
3567 .start = socket_start,
3568 .stop = socket_stop,
3569
3570 .kill = socket_kill,
3571 .clean = socket_clean,
3572 .can_clean = socket_can_clean,
3573
3574 .get_timeout = socket_get_timeout,
3575
3576 .serialize = socket_serialize,
3577 .deserialize_item = socket_deserialize_item,
3578 .distribute_fds = socket_distribute_fds,
3579
3580 .active_state = socket_active_state,
3581 .sub_state_to_string = socket_sub_state_to_string,
3582
3583 .will_restart = unit_will_restart_default,
3584
3585 .may_gc = socket_may_gc,
3586
3587 .sigchld_event = socket_sigchld_event,
3588
3589 .trigger_notify = socket_trigger_notify,
3590
3591 .reset_failed = socket_reset_failed,
3592
3593 .control_pid = socket_control_pid,
3594
3595 .bus_set_property = bus_socket_set_property,
3596 .bus_commit_properties = bus_socket_commit_properties,
3597
3598 .status_message_formats = {
3599 .finished_start_job = {
3600 [JOB_DONE] = "Listening on %s.",
3601 [JOB_FAILED] = "Failed to listen on %s.",
3602 [JOB_TIMEOUT] = "Timed out starting %s.",
3603 },
3604 .finished_stop_job = {
3605 [JOB_DONE] = "Closed %s.",
3606 [JOB_FAILED] = "Failed stopping %s.",
3607 [JOB_TIMEOUT] = "Timed out stopping %s.",
3608 },
3609 },
3610
3611 .can_start = socket_can_start,
3612 };
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