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[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase.h"
18 #include "constants.h"
19 #include "copy.h"
20 #include "dbus-socket.h"
21 #include "dbus-unit.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label-util.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN_DELUXE;
86 s->timeout_usec = u->manager->defaults.timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->defaults.std_output;
98 s->exec_context.std_error = u->manager->defaults.std_error;
99
100 s->control_pid = PIDREF_NULL;
101 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
102
103 s->trigger_limit.interval = USEC_INFINITY;
104 s->trigger_limit.burst = UINT_MAX;
105
106 s->poll_limit_interval = USEC_INFINITY;
107 s->poll_limit_burst = UINT_MAX;
108 }
109
110 static void socket_unwatch_control_pid(Socket *s) {
111 assert(s);
112
113 if (!pidref_is_set(&s->control_pid))
114 return;
115
116 unit_unwatch_pid(UNIT(s), s->control_pid.pid);
117 pidref_done(&s->control_pid);
118 }
119
120 static void socket_cleanup_fd_list(SocketPort *p) {
121 assert(p);
122
123 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
124 p->auxiliary_fds = mfree(p->auxiliary_fds);
125 p->n_auxiliary_fds = 0;
126 }
127
128 SocketPort *socket_port_free(SocketPort *p) {
129 if (!p)
130 return NULL;
131
132 sd_event_source_unref(p->event_source);
133
134 socket_cleanup_fd_list(p);
135 safe_close(p->fd);
136 free(p->path);
137
138 return mfree(p);
139 }
140
141 void socket_free_ports(Socket *s) {
142 assert(s);
143
144 LIST_CLEAR(port, s->ports, socket_port_free);
145 }
146
147 static void socket_done(Unit *u) {
148 Socket *s = SOCKET(u);
149 SocketPeer *p;
150
151 assert(s);
152
153 socket_free_ports(s);
154
155 while ((p = set_steal_first(s->peers_by_address)))
156 p->socket = NULL;
157
158 s->peers_by_address = set_free(s->peers_by_address);
159
160 s->exec_runtime = exec_runtime_free(s->exec_runtime);
161 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
162 s->control_command = NULL;
163
164 socket_unwatch_control_pid(s);
165
166 unit_ref_unset(&s->service);
167
168 s->tcp_congestion = mfree(s->tcp_congestion);
169 s->bind_to_device = mfree(s->bind_to_device);
170
171 s->smack = mfree(s->smack);
172 s->smack_ip_in = mfree(s->smack_ip_in);
173 s->smack_ip_out = mfree(s->smack_ip_out);
174
175 strv_free(s->symlinks);
176
177 s->user = mfree(s->user);
178 s->group = mfree(s->group);
179
180 s->fdname = mfree(s->fdname);
181
182 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
183 }
184
185 static int socket_arm_timer(Socket *s, usec_t usec) {
186 int r;
187
188 assert(s);
189
190 if (s->timer_event_source) {
191 r = sd_event_source_set_time(s->timer_event_source, usec);
192 if (r < 0)
193 return r;
194
195 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
196 }
197
198 if (usec == USEC_INFINITY)
199 return 0;
200
201 r = sd_event_add_time(
202 UNIT(s)->manager->event,
203 &s->timer_event_source,
204 CLOCK_MONOTONIC,
205 usec, 0,
206 socket_dispatch_timer, s);
207 if (r < 0)
208 return r;
209
210 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
211
212 return 0;
213 }
214
215 static bool have_non_accept_socket(Socket *s) {
216 assert(s);
217
218 if (!s->accept)
219 return true;
220
221 LIST_FOREACH(port, p, s->ports) {
222
223 if (p->type != SOCKET_SOCKET)
224 return true;
225
226 if (!socket_address_can_accept(&p->address))
227 return true;
228 }
229
230 return false;
231 }
232
233 static int socket_add_mount_dependencies(Socket *s) {
234 int r;
235
236 assert(s);
237
238 LIST_FOREACH(port, p, s->ports) {
239 const char *path = NULL;
240
241 if (p->type == SOCKET_SOCKET)
242 path = socket_address_get_path(&p->address);
243 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
244 path = p->path;
245
246 if (!path)
247 continue;
248
249 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
250 if (r < 0)
251 return r;
252 }
253
254 return 0;
255 }
256
257 static int socket_add_device_dependencies(Socket *s) {
258 char *t;
259
260 assert(s);
261
262 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
263 return 0;
264
265 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
266 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
267 }
268
269 static int socket_add_default_dependencies(Socket *s) {
270 int r;
271 assert(s);
272
273 if (!UNIT(s)->default_dependencies)
274 return 0;
275
276 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279
280 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
281 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 if (r < 0)
283 return r;
284 }
285
286 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
287 }
288
289 static bool socket_has_exec(Socket *s) {
290 unsigned i;
291 assert(s);
292
293 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
294 if (s->exec_command[i])
295 return true;
296
297 return false;
298 }
299
300 static int socket_add_extras(Socket *s) {
301 Unit *u = UNIT(s);
302 int r;
303
304 assert(s);
305
306 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
307 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
308 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
309 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
310 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
311 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
312 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
313 * service starts are typical.
314 *
315 * For the poll limit we follow a similar rule, but use 3/4th of the trigger limit parameters, to
316 * trigger this earlier. */
317
318 if (s->trigger_limit.interval == USEC_INFINITY)
319 s->trigger_limit.interval = 2 * USEC_PER_SEC;
320 if (s->trigger_limit.burst == UINT_MAX)
321 s->trigger_limit.burst = s->accept ? 200 : 20;
322
323 if (s->poll_limit_interval == USEC_INFINITY)
324 s->poll_limit_interval = 2 * USEC_PER_SEC;
325 if (s->poll_limit_burst == UINT_MAX)
326 s->poll_limit_burst = s->accept ? 150 : 15;
327
328 if (have_non_accept_socket(s)) {
329
330 if (!UNIT_DEREF(s->service)) {
331 Unit *x;
332
333 r = unit_load_related_unit(u, ".service", &x);
334 if (r < 0)
335 return r;
336
337 unit_ref_set(&s->service, u, x);
338 }
339
340 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
341 if (r < 0)
342 return r;
343 }
344
345 r = socket_add_mount_dependencies(s);
346 if (r < 0)
347 return r;
348
349 r = socket_add_device_dependencies(s);
350 if (r < 0)
351 return r;
352
353 r = unit_patch_contexts(u);
354 if (r < 0)
355 return r;
356
357 if (socket_has_exec(s)) {
358 r = unit_add_exec_dependencies(u, &s->exec_context);
359 if (r < 0)
360 return r;
361 }
362
363 r = unit_set_default_slice(u);
364 if (r < 0)
365 return r;
366
367 r = socket_add_default_dependencies(s);
368 if (r < 0)
369 return r;
370
371 return 0;
372 }
373
374 static const char *socket_find_symlink_target(Socket *s) {
375 const char *found = NULL;
376
377 LIST_FOREACH(port, p, s->ports) {
378 const char *f = NULL;
379
380 switch (p->type) {
381
382 case SOCKET_FIFO:
383 f = p->path;
384 break;
385
386 case SOCKET_SOCKET:
387 f = socket_address_get_path(&p->address);
388 break;
389
390 default:
391 break;
392 }
393
394 if (f) {
395 if (found)
396 return NULL;
397
398 found = f;
399 }
400 }
401
402 return found;
403 }
404
405 static int socket_verify(Socket *s) {
406 assert(s);
407 assert(UNIT(s)->load_state == UNIT_LOADED);
408
409 if (!s->ports)
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
411
412 if (s->accept && have_non_accept_socket(s))
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
414
415 if (s->accept && s->max_connections <= 0)
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
417
418 if (s->accept && UNIT_DEREF(s->service))
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
420
421 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
422 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
423
424 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
425 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.");
426
427 return 0;
428 }
429
430 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
431 assert(s);
432
433 if (s->peer.sa.sa_family == AF_INET)
434 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
435 else if (s->peer.sa.sa_family == AF_INET6)
436 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
437 else if (s->peer.sa.sa_family == AF_VSOCK)
438 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
439 else
440 assert_not_reached();
441 }
442
443 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
444 int r;
445
446 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
447 if (r != 0)
448 return r;
449
450 switch (x->peer.sa.sa_family) {
451 case AF_INET:
452 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
453 case AF_INET6:
454 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
455 case AF_VSOCK:
456 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
457 }
458 assert_not_reached();
459 }
460
461 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
462
463 static int socket_load(Unit *u) {
464 Socket *s = SOCKET(u);
465 int r;
466
467 assert(u);
468 assert(u->load_state == UNIT_STUB);
469
470 r = unit_load_fragment_and_dropin(u, true);
471 if (r < 0)
472 return r;
473
474 if (u->load_state != UNIT_LOADED)
475 return 0;
476
477 /* This is a new unit? Then let's add in some extras */
478 r = socket_add_extras(s);
479 if (r < 0)
480 return r;
481
482 return socket_verify(s);
483 }
484
485 static SocketPeer *socket_peer_new(void) {
486 SocketPeer *p;
487
488 p = new(SocketPeer, 1);
489 if (!p)
490 return NULL;
491
492 *p = (SocketPeer) {
493 .n_ref = 1,
494 };
495 return p;
496 }
497
498 static SocketPeer *socket_peer_free(SocketPeer *p) {
499 assert(p);
500
501 if (p->socket)
502 set_remove(p->socket->peers_by_address, p);
503
504 return mfree(p);
505 }
506
507 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
508
509 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
510 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
511 SocketPeer sa = {
512 .peer_salen = sizeof(union sockaddr_union),
513 }, *i;
514 int r;
515
516 assert(fd >= 0);
517 assert(s);
518
519 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
520 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
521
522 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
523 *p = NULL;
524 return 0;
525 }
526
527 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
528 if (r < 0)
529 return r;
530
531 i = set_get(s->peers_by_address, &sa);
532 if (i) {
533 *p = socket_peer_ref(i);
534 return 1;
535 }
536
537 remote = socket_peer_new();
538 if (!remote)
539 return log_oom();
540
541 remote->peer = sa.peer;
542 remote->peer_salen = sa.peer_salen;
543
544 r = set_put(s->peers_by_address, remote);
545 if (r < 0)
546 return r;
547
548 remote->socket = s;
549
550 *p = TAKE_PTR(remote);
551 return 1;
552 }
553
554 static const char* listen_lookup(int family, int type) {
555
556 if (family == AF_NETLINK)
557 return "ListenNetlink";
558
559 if (type == SOCK_STREAM)
560 return "ListenStream";
561 else if (type == SOCK_DGRAM)
562 return "ListenDatagram";
563 else if (type == SOCK_SEQPACKET)
564 return "ListenSequentialPacket";
565
566 assert_not_reached();
567 return NULL;
568 }
569
570 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
571 Socket *s = SOCKET(u);
572 const char *prefix2, *str;
573
574 assert(s);
575 assert(f);
576
577 prefix = strempty(prefix);
578 prefix2 = strjoina(prefix, "\t");
579
580 fprintf(f,
581 "%sSocket State: %s\n"
582 "%sResult: %s\n"
583 "%sClean Result: %s\n"
584 "%sBindIPv6Only: %s\n"
585 "%sBacklog: %u\n"
586 "%sSocketMode: %04o\n"
587 "%sDirectoryMode: %04o\n"
588 "%sKeepAlive: %s\n"
589 "%sNoDelay: %s\n"
590 "%sFreeBind: %s\n"
591 "%sTransparent: %s\n"
592 "%sBroadcast: %s\n"
593 "%sPassCredentials: %s\n"
594 "%sPassSecurity: %s\n"
595 "%sPassPacketInfo: %s\n"
596 "%sTCPCongestion: %s\n"
597 "%sRemoveOnStop: %s\n"
598 "%sWritable: %s\n"
599 "%sFileDescriptorName: %s\n"
600 "%sSELinuxContextFromNet: %s\n",
601 prefix, socket_state_to_string(s->state),
602 prefix, socket_result_to_string(s->result),
603 prefix, socket_result_to_string(s->clean_result),
604 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
605 prefix, s->backlog,
606 prefix, s->socket_mode,
607 prefix, s->directory_mode,
608 prefix, yes_no(s->keep_alive),
609 prefix, yes_no(s->no_delay),
610 prefix, yes_no(s->free_bind),
611 prefix, yes_no(s->transparent),
612 prefix, yes_no(s->broadcast),
613 prefix, yes_no(s->pass_cred),
614 prefix, yes_no(s->pass_sec),
615 prefix, yes_no(s->pass_pktinfo),
616 prefix, strna(s->tcp_congestion),
617 prefix, yes_no(s->remove_on_stop),
618 prefix, yes_no(s->writable),
619 prefix, socket_fdname(s),
620 prefix, yes_no(s->selinux_context_from_net));
621
622 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
623 fprintf(f,
624 "%sTimestamping: %s\n",
625 prefix, socket_timestamping_to_string(s->timestamping));
626
627 if (pidref_is_set(&s->control_pid))
628 fprintf(f,
629 "%sControl PID: "PID_FMT"\n",
630 prefix, s->control_pid.pid);
631
632 if (s->bind_to_device)
633 fprintf(f,
634 "%sBindToDevice: %s\n",
635 prefix, s->bind_to_device);
636
637 if (s->accept)
638 fprintf(f,
639 "%sAccepted: %u\n"
640 "%sNConnections: %u\n"
641 "%sMaxConnections: %u\n"
642 "%sMaxConnectionsPerSource: %u\n",
643 prefix, s->n_accepted,
644 prefix, s->n_connections,
645 prefix, s->max_connections,
646 prefix, s->max_connections_per_source);
647 else
648 fprintf(f,
649 "%sFlushPending: %s\n",
650 prefix, yes_no(s->flush_pending));
651
652
653 if (s->priority >= 0)
654 fprintf(f,
655 "%sPriority: %i\n",
656 prefix, s->priority);
657
658 if (s->receive_buffer > 0)
659 fprintf(f,
660 "%sReceiveBuffer: %zu\n",
661 prefix, s->receive_buffer);
662
663 if (s->send_buffer > 0)
664 fprintf(f,
665 "%sSendBuffer: %zu\n",
666 prefix, s->send_buffer);
667
668 if (s->ip_tos >= 0)
669 fprintf(f,
670 "%sIPTOS: %i\n",
671 prefix, s->ip_tos);
672
673 if (s->ip_ttl >= 0)
674 fprintf(f,
675 "%sIPTTL: %i\n",
676 prefix, s->ip_ttl);
677
678 if (s->pipe_size > 0)
679 fprintf(f,
680 "%sPipeSize: %zu\n",
681 prefix, s->pipe_size);
682
683 if (s->mark >= 0)
684 fprintf(f,
685 "%sMark: %i\n",
686 prefix, s->mark);
687
688 if (s->mq_maxmsg > 0)
689 fprintf(f,
690 "%sMessageQueueMaxMessages: %li\n",
691 prefix, s->mq_maxmsg);
692
693 if (s->mq_msgsize > 0)
694 fprintf(f,
695 "%sMessageQueueMessageSize: %li\n",
696 prefix, s->mq_msgsize);
697
698 if (s->reuse_port)
699 fprintf(f,
700 "%sReusePort: %s\n",
701 prefix, yes_no(s->reuse_port));
702
703 if (s->smack)
704 fprintf(f,
705 "%sSmackLabel: %s\n",
706 prefix, s->smack);
707
708 if (s->smack_ip_in)
709 fprintf(f,
710 "%sSmackLabelIPIn: %s\n",
711 prefix, s->smack_ip_in);
712
713 if (s->smack_ip_out)
714 fprintf(f,
715 "%sSmackLabelIPOut: %s\n",
716 prefix, s->smack_ip_out);
717
718 if (!isempty(s->user) || !isempty(s->group))
719 fprintf(f,
720 "%sSocketUser: %s\n"
721 "%sSocketGroup: %s\n",
722 prefix, strna(s->user),
723 prefix, strna(s->group));
724
725 if (timestamp_is_set(s->keep_alive_time))
726 fprintf(f,
727 "%sKeepAliveTimeSec: %s\n",
728 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
729
730 if (s->keep_alive_interval > 0)
731 fprintf(f,
732 "%sKeepAliveIntervalSec: %s\n",
733 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
734
735 if (s->keep_alive_cnt > 0)
736 fprintf(f,
737 "%sKeepAliveProbes: %u\n",
738 prefix, s->keep_alive_cnt);
739
740 if (s->defer_accept > 0)
741 fprintf(f,
742 "%sDeferAcceptSec: %s\n",
743 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
744
745 LIST_FOREACH(port, p, s->ports) {
746
747 switch (p->type) {
748 case SOCKET_SOCKET: {
749 _cleanup_free_ char *k = NULL;
750 int r;
751
752 r = socket_address_print(&p->address, &k);
753 if (r < 0) {
754 errno = -r;
755 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
756 } else
757 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
758 break;
759 }
760 case SOCKET_SPECIAL:
761 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
762 break;
763 case SOCKET_USB_FUNCTION:
764 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
765 break;
766 case SOCKET_MQUEUE:
767 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
768 break;
769 default:
770 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
771 }
772 }
773
774 fprintf(f,
775 "%sTriggerLimitIntervalSec: %s\n"
776 "%sTriggerLimitBurst: %u\n"
777 "%sPollLimitIntervalSec: %s\n"
778 "%sPollLimitBurst: %u\n",
779 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
780 prefix, s->trigger_limit.burst,
781 prefix, FORMAT_TIMESPAN(s->poll_limit_interval, USEC_PER_SEC),
782 prefix, s->poll_limit_burst);
783
784 str = ip_protocol_to_name(s->socket_protocol);
785 if (str)
786 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
787
788 if (!strv_isempty(s->symlinks)) {
789 fprintf(f, "%sSymlinks:", prefix);
790 STRV_FOREACH(q, s->symlinks)
791 fprintf(f, " %s", *q);
792
793 fprintf(f, "\n");
794 }
795
796 fprintf(f,
797 "%sTimeoutSec: %s\n",
798 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
799
800 exec_context_dump(&s->exec_context, f, prefix);
801 kill_context_dump(&s->kill_context, f, prefix);
802
803 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
804 if (!s->exec_command[c])
805 continue;
806
807 fprintf(f, "%s-> %s:\n",
808 prefix, socket_exec_command_to_string(c));
809
810 exec_command_dump_list(s->exec_command[c], f, prefix2);
811 }
812
813 cgroup_context_dump(UNIT(s), f, prefix);
814 }
815
816 static int instance_from_socket(int fd, unsigned nr, char **instance) {
817 socklen_t l;
818 char *r;
819 union sockaddr_union local, remote;
820
821 assert(fd >= 0);
822 assert(instance);
823
824 l = sizeof(local);
825 if (getsockname(fd, &local.sa, &l) < 0)
826 return -errno;
827
828 l = sizeof(remote);
829 if (getpeername(fd, &remote.sa, &l) < 0)
830 return -errno;
831
832 switch (local.sa.sa_family) {
833
834 case AF_INET: {
835 uint32_t
836 a = be32toh(local.in.sin_addr.s_addr),
837 b = be32toh(remote.in.sin_addr.s_addr);
838
839 if (asprintf(&r,
840 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
841 nr,
842 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
843 be16toh(local.in.sin_port),
844 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
845 be16toh(remote.in.sin_port)) < 0)
846 return -ENOMEM;
847
848 break;
849 }
850
851 case AF_INET6: {
852 static const unsigned char ipv4_prefix[] = {
853 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
854 };
855
856 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
857 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
858 const uint8_t
859 *a = local.in6.sin6_addr.s6_addr+12,
860 *b = remote.in6.sin6_addr.s6_addr+12;
861
862 if (asprintf(&r,
863 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
864 nr,
865 a[0], a[1], a[2], a[3],
866 be16toh(local.in6.sin6_port),
867 b[0], b[1], b[2], b[3],
868 be16toh(remote.in6.sin6_port)) < 0)
869 return -ENOMEM;
870 } else {
871 if (asprintf(&r,
872 "%u-%s:%u-%s:%u",
873 nr,
874 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
875 be16toh(local.in6.sin6_port),
876 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
877 be16toh(remote.in6.sin6_port)) < 0)
878 return -ENOMEM;
879 }
880
881 break;
882 }
883
884 case AF_UNIX: {
885 struct ucred ucred;
886 int k;
887
888 k = getpeercred(fd, &ucred);
889 if (k >= 0) {
890 if (asprintf(&r,
891 "%u-"PID_FMT"-"UID_FMT,
892 nr, ucred.pid, ucred.uid) < 0)
893 return -ENOMEM;
894 } else if (k == -ENODATA) {
895 /* This handles the case where somebody is
896 * connecting from another pid/uid namespace
897 * (e.g. from outside of our container). */
898 if (asprintf(&r,
899 "%u-unknown",
900 nr) < 0)
901 return -ENOMEM;
902 } else
903 return k;
904
905 break;
906 }
907
908 case AF_VSOCK:
909 if (asprintf(&r,
910 "%u-%u:%u-%u:%u",
911 nr,
912 local.vm.svm_cid, local.vm.svm_port,
913 remote.vm.svm_cid, remote.vm.svm_port) < 0)
914 return -ENOMEM;
915
916 break;
917
918 default:
919 assert_not_reached();
920 }
921
922 *instance = r;
923 return 0;
924 }
925
926 static void socket_close_fds(Socket *s) {
927 assert(s);
928
929 LIST_FOREACH(port, p, s->ports) {
930 bool was_open;
931
932 was_open = p->fd >= 0;
933
934 p->event_source = sd_event_source_disable_unref(p->event_source);
935 p->fd = safe_close(p->fd);
936 socket_cleanup_fd_list(p);
937
938 /* One little note: we should normally not delete any sockets in the file system here! After all some
939 * other process we spawned might still have a reference of this fd and wants to continue to use
940 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
941 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
942 * anyway, but only then. */
943
944 if (!was_open || !s->remove_on_stop)
945 continue;
946
947 switch (p->type) {
948
949 case SOCKET_FIFO:
950 (void) unlink(p->path);
951 break;
952
953 case SOCKET_MQUEUE:
954 (void) mq_unlink(p->path);
955 break;
956
957 case SOCKET_SOCKET:
958 (void) socket_address_unlink(&p->address);
959 break;
960
961 default:
962 break;
963 }
964 }
965
966 if (s->remove_on_stop)
967 STRV_FOREACH(i, s->symlinks)
968 (void) unlink(*i);
969
970 /* Note that we don't return NULL here, since s has not been freed. */
971 }
972
973 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
974 int r;
975
976 assert(s);
977 assert(p);
978 assert(fd >= 0);
979
980 if (s->keep_alive) {
981 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
982 if (r < 0)
983 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
984 }
985
986 if (timestamp_is_set(s->keep_alive_time)) {
987 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
988 if (r < 0)
989 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
990 }
991
992 if (s->keep_alive_interval > 0) {
993 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
994 if (r < 0)
995 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
996 }
997
998 if (s->keep_alive_cnt > 0) {
999 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1000 if (r < 0)
1001 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1002 }
1003
1004 if (s->defer_accept > 0) {
1005 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1006 if (r < 0)
1007 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1008 }
1009
1010 if (s->no_delay) {
1011 if (s->socket_protocol == IPPROTO_SCTP) {
1012 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1013 if (r < 0)
1014 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1015 } else {
1016 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1017 if (r < 0)
1018 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1019 }
1020 }
1021
1022 if (s->broadcast) {
1023 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1024 if (r < 0)
1025 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1026 }
1027
1028 if (s->pass_cred) {
1029 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1030 if (r < 0)
1031 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1032 }
1033
1034 if (s->pass_sec) {
1035 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1036 if (r < 0)
1037 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1038 }
1039
1040 if (s->pass_pktinfo) {
1041 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1042 if (r < 0)
1043 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1044 }
1045
1046 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1047 r = setsockopt_int(fd, SOL_SOCKET,
1048 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1049 true);
1050 if (r < 0)
1051 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1052 }
1053
1054 if (s->priority >= 0) {
1055 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1056 if (r < 0)
1057 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1058 }
1059
1060 if (s->receive_buffer > 0) {
1061 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1062 if (r < 0)
1063 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1064 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1065 }
1066
1067 if (s->send_buffer > 0) {
1068 r = fd_set_sndbuf(fd, s->send_buffer, false);
1069 if (r < 0)
1070 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1071 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1072 }
1073
1074 if (s->mark >= 0) {
1075 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1076 if (r < 0)
1077 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1078 }
1079
1080 if (s->ip_tos >= 0) {
1081 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1082 if (r < 0)
1083 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1084 }
1085
1086 if (s->ip_ttl >= 0) {
1087 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1088 if (r < 0)
1089 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1090 }
1091
1092 if (s->tcp_congestion)
1093 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1094 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1095
1096 if (s->smack_ip_in) {
1097 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1098 if (r < 0)
1099 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1100 }
1101
1102 if (s->smack_ip_out) {
1103 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1104 if (r < 0)
1105 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1106 }
1107 }
1108
1109 static void socket_apply_fifo_options(Socket *s, int fd) {
1110 int r;
1111
1112 assert(s);
1113 assert(fd >= 0);
1114
1115 if (s->pipe_size > 0)
1116 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1117 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1118
1119 if (s->smack) {
1120 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1121 if (r < 0)
1122 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1123 }
1124 }
1125
1126 static int fifo_address_create(
1127 const char *path,
1128 mode_t directory_mode,
1129 mode_t socket_mode) {
1130
1131 _cleanup_close_ int fd = -EBADF;
1132 mode_t old_mask;
1133 struct stat st;
1134 int r;
1135
1136 assert(path);
1137
1138 (void) mkdir_parents_label(path, directory_mode);
1139
1140 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1141 if (r < 0)
1142 return r;
1143
1144 /* Enforce the right access mode for the fifo */
1145 old_mask = umask(~socket_mode);
1146
1147 /* Include the original umask in our mask */
1148 (void) umask(~socket_mode | old_mask);
1149
1150 r = mkfifo(path, socket_mode);
1151 (void) umask(old_mask);
1152
1153 if (r < 0 && errno != EEXIST) {
1154 r = -errno;
1155 goto fail;
1156 }
1157
1158 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1159 if (fd < 0) {
1160 r = -errno;
1161 goto fail;
1162 }
1163
1164 mac_selinux_create_file_clear();
1165
1166 if (fstat(fd, &st) < 0) {
1167 r = -errno;
1168 goto fail;
1169 }
1170
1171 if (!S_ISFIFO(st.st_mode) ||
1172 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1173 st.st_uid != getuid() ||
1174 st.st_gid != getgid()) {
1175 r = -EEXIST;
1176 goto fail;
1177 }
1178
1179 return TAKE_FD(fd);
1180
1181 fail:
1182 mac_selinux_create_file_clear();
1183 return r;
1184 }
1185
1186 static int special_address_create(const char *path, bool writable) {
1187 _cleanup_close_ int fd = -EBADF;
1188 struct stat st;
1189
1190 assert(path);
1191
1192 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1193 if (fd < 0)
1194 return -errno;
1195
1196 if (fstat(fd, &st) < 0)
1197 return -errno;
1198
1199 /* Check whether this is a /proc, /sys or /dev file or char device */
1200 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1201 return -EEXIST;
1202
1203 return TAKE_FD(fd);
1204 }
1205
1206 static int usbffs_address_create(const char *path) {
1207 _cleanup_close_ int fd = -EBADF;
1208 struct stat st;
1209
1210 assert(path);
1211
1212 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1213 if (fd < 0)
1214 return -errno;
1215
1216 if (fstat(fd, &st) < 0)
1217 return -errno;
1218
1219 /* Check whether this is a regular file (ffs endpoint) */
1220 if (!S_ISREG(st.st_mode))
1221 return -EEXIST;
1222
1223 return TAKE_FD(fd);
1224 }
1225
1226 static int mq_address_create(
1227 const char *path,
1228 mode_t mq_mode,
1229 long maxmsg,
1230 long msgsize) {
1231
1232 _cleanup_close_ int fd = -EBADF;
1233 struct stat st;
1234 mode_t old_mask;
1235 struct mq_attr _attr, *attr = NULL;
1236
1237 assert(path);
1238
1239 if (maxmsg > 0 && msgsize > 0) {
1240 _attr = (struct mq_attr) {
1241 .mq_flags = O_NONBLOCK,
1242 .mq_maxmsg = maxmsg,
1243 .mq_msgsize = msgsize,
1244 };
1245 attr = &_attr;
1246 }
1247
1248 /* Enforce the right access mode for the mq */
1249 old_mask = umask(~mq_mode);
1250
1251 /* Include the original umask in our mask */
1252 (void) umask(~mq_mode | old_mask);
1253 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1254 (void) umask(old_mask);
1255
1256 if (fd < 0)
1257 return -errno;
1258
1259 if (fstat(fd, &st) < 0)
1260 return -errno;
1261
1262 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1263 st.st_uid != getuid() ||
1264 st.st_gid != getgid())
1265 return -EEXIST;
1266
1267 return TAKE_FD(fd);
1268 }
1269
1270 static int socket_symlink(Socket *s) {
1271 const char *p;
1272 int r;
1273
1274 assert(s);
1275
1276 p = socket_find_symlink_target(s);
1277 if (!p)
1278 return 0;
1279
1280 STRV_FOREACH(i, s->symlinks) {
1281 (void) mkdir_parents_label(*i, s->directory_mode);
1282
1283 r = symlink_idempotent(p, *i, false);
1284
1285 if (r == -EEXIST && s->remove_on_stop) {
1286 /* If there's already something where we want to create the symlink, and the destructive
1287 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1288 * again. */
1289
1290 if (unlink(*i) >= 0)
1291 r = symlink_idempotent(p, *i, false);
1292 }
1293
1294 if (r < 0)
1295 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1296 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1297 }
1298
1299 return 0;
1300 }
1301
1302 static int usbffs_write_descs(int fd, Service *s) {
1303 int r;
1304
1305 if (!s->usb_function_descriptors || !s->usb_function_strings)
1306 return -EINVAL;
1307
1308 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1309 if (r < 0)
1310 return r;
1311
1312 return copy_file_fd(s->usb_function_strings, fd, 0);
1313 }
1314
1315 static int usbffs_select_ep(const struct dirent *d) {
1316 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1317 }
1318
1319 static int usbffs_dispatch_eps(SocketPort *p) {
1320 _cleanup_free_ struct dirent **ent = NULL;
1321 size_t n, k;
1322 int r;
1323
1324 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1325 if (r < 0)
1326 return -errno;
1327
1328 n = (size_t) r;
1329 p->auxiliary_fds = new(int, n);
1330 if (!p->auxiliary_fds) {
1331 r = -ENOMEM;
1332 goto clear;
1333 }
1334
1335 p->n_auxiliary_fds = n;
1336
1337 k = 0;
1338 for (size_t i = 0; i < n; ++i) {
1339 _cleanup_free_ char *ep = NULL;
1340
1341 ep = path_make_absolute(ent[i]->d_name, p->path);
1342 if (!ep) {
1343 r = -ENOMEM;
1344 goto fail;
1345 }
1346
1347 path_simplify(ep);
1348
1349 r = usbffs_address_create(ep);
1350 if (r < 0)
1351 goto fail;
1352
1353 p->auxiliary_fds[k++] = r;
1354 }
1355
1356 r = 0;
1357 goto clear;
1358
1359 fail:
1360 close_many(p->auxiliary_fds, k);
1361 p->auxiliary_fds = mfree(p->auxiliary_fds);
1362 p->n_auxiliary_fds = 0;
1363
1364 clear:
1365 free_many((void**) ent, n);
1366 return r;
1367 }
1368
1369 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1370 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1371 *
1372 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1373 * instance name.
1374 */
1375
1376 if (UNIT_ISSET(s->service)) {
1377 *ret = UNIT_DEREF(s->service);
1378 return 0;
1379 }
1380
1381 if (!s->accept)
1382 return -ENODATA;
1383
1384 /* Build the instance name and load the unit */
1385 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1386 int r;
1387
1388 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1389 if (r < 0)
1390 return r;
1391
1392 if (cfd >= 0) {
1393 r = instance_from_socket(cfd, s->n_accepted, &instance);
1394 if (r < 0) {
1395 if (ERRNO_IS_DISCONNECT(r))
1396 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1397 * different errors. This connection is over, but the socket unit lives on. */
1398 return log_unit_debug_errno(UNIT(s), r,
1399 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1400 errno_to_name(r));
1401 return r;
1402 }
1403 }
1404
1405 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1406 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1407 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1408 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1409 if (r < 0)
1410 return r;
1411
1412 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1413 }
1414
1415 static int socket_determine_selinux_label(Socket *s, char **ret) {
1416 int r;
1417
1418 assert(s);
1419 assert(ret);
1420
1421 Unit *service;
1422 ExecCommand *c;
1423 const char *exec_context;
1424 _cleanup_free_ char *path = NULL;
1425
1426 r = socket_load_service_unit(s, -1, &service);
1427 if (r == -ENODATA)
1428 goto no_label;
1429 if (r < 0)
1430 return r;
1431
1432 exec_context = SERVICE(service)->exec_context.selinux_context;
1433 if (exec_context) {
1434 char *con;
1435
1436 con = strdup(exec_context);
1437 if (!con)
1438 return -ENOMEM;
1439
1440 *ret = TAKE_PTR(con);
1441 return 0;
1442 }
1443
1444 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1445 if (!c)
1446 goto no_label;
1447
1448 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1449 if (r < 0)
1450 goto no_label;
1451
1452 r = mac_selinux_get_create_label_from_exe(path, ret);
1453 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1454 goto no_label;
1455 return r;
1456
1457 no_label:
1458 *ret = NULL;
1459 return 0;
1460 }
1461
1462 static int socket_address_listen_do(
1463 Socket *s,
1464 const SocketAddress *address,
1465 const char *label) {
1466
1467 assert(s);
1468 assert(address);
1469
1470 return socket_address_listen(
1471 address,
1472 SOCK_CLOEXEC|SOCK_NONBLOCK,
1473 s->backlog,
1474 s->bind_ipv6_only,
1475 s->bind_to_device,
1476 s->reuse_port,
1477 s->free_bind,
1478 s->transparent,
1479 s->directory_mode,
1480 s->socket_mode,
1481 label);
1482 }
1483
1484 #define log_address_error_errno(u, address, error, fmt) \
1485 ({ \
1486 _cleanup_free_ char *_t = NULL; \
1487 \
1488 (void) socket_address_print(address, &_t); \
1489 log_unit_error_errno(u, error, fmt, strna(_t)); \
1490 })
1491
1492 static int fork_needed(const SocketAddress *address, Socket *s) {
1493 int r;
1494
1495 assert(address);
1496 assert(s);
1497
1498 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1499
1500 /* If there are any NFTSet= directives with cgroup source, we need the cgroup */
1501 Unit *u = UNIT(s);
1502 CGroupContext *c = unit_get_cgroup_context(u);
1503 if (c)
1504 FOREACH_ARRAY(nft_set, c->nft_set_context.sets, c->nft_set_context.n_sets)
1505 if (nft_set->source == NFT_SET_SOURCE_CGROUP)
1506 return true;
1507
1508 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1509 r = bpf_firewall_supported();
1510 if (r < 0)
1511 return r;
1512 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1513 return true;
1514 }
1515
1516 return exec_needs_network_namespace(&s->exec_context);
1517 }
1518
1519 static int socket_address_listen_in_cgroup(
1520 Socket *s,
1521 const SocketAddress *address,
1522 const char *label) {
1523
1524 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1525 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1526 int fd, r;
1527
1528 assert(s);
1529 assert(address);
1530
1531 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1532 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1533 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1534 * such. */
1535
1536 r = fork_needed(address, s);
1537 if (r < 0)
1538 return r;
1539 if (r == 0) {
1540 /* Shortcut things... */
1541 fd = socket_address_listen_do(s, address, label);
1542 if (fd < 0)
1543 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1544
1545 return fd;
1546 }
1547
1548 r = unit_setup_exec_runtime(UNIT(s));
1549 if (r < 0)
1550 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1551
1552 if (s->exec_context.network_namespace_path &&
1553 s->exec_runtime &&
1554 s->exec_runtime->shared &&
1555 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1556 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1557 if (r < 0)
1558 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1559 }
1560
1561 if (s->exec_context.ipc_namespace_path &&
1562 s->exec_runtime &&
1563 s->exec_runtime->shared &&
1564 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1565 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1566 if (r < 0)
1567 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1568 }
1569
1570 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1571 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1572
1573 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1574 if (r < 0)
1575 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1576 if (r == 0) {
1577 /* Child */
1578
1579 pair[0] = safe_close(pair[0]);
1580
1581 if (exec_needs_network_namespace(&s->exec_context) &&
1582 s->exec_runtime &&
1583 s->exec_runtime->shared &&
1584 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1585
1586 if (ns_type_supported(NAMESPACE_NET)) {
1587 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1588 if (r < 0) {
1589 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1590 _exit(EXIT_NETWORK);
1591 }
1592 } else if (s->exec_context.network_namespace_path) {
1593 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1594 _exit(EXIT_NETWORK);
1595 } else
1596 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1597 }
1598
1599 fd = socket_address_listen_do(s, address, label);
1600 if (fd < 0) {
1601 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1602 _exit(EXIT_FAILURE);
1603 }
1604
1605 r = send_one_fd(pair[1], fd, 0);
1606 if (r < 0) {
1607 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1608 _exit(EXIT_FAILURE);
1609 }
1610
1611 _exit(EXIT_SUCCESS);
1612 }
1613
1614 pair[1] = safe_close(pair[1]);
1615 fd = receive_one_fd(pair[0], 0);
1616
1617 /* We synchronously wait for the helper, as it shouldn't be slow */
1618 r = wait_for_terminate_and_check("(sd-listen)", pid.pid, WAIT_LOG_ABNORMAL);
1619 if (r < 0) {
1620 safe_close(fd);
1621 return r;
1622 }
1623
1624 if (fd < 0)
1625 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1626
1627 return fd;
1628 }
1629
1630 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1631
1632 static int socket_open_fds(Socket *orig_s) {
1633 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1634 _cleanup_(mac_selinux_freep) char *label = NULL;
1635 bool know_label = false;
1636 int r;
1637
1638 assert(s);
1639
1640 LIST_FOREACH(port, p, s->ports) {
1641
1642 if (p->fd >= 0)
1643 continue;
1644
1645 switch (p->type) {
1646
1647 case SOCKET_SOCKET:
1648
1649 if (!know_label) {
1650 /* Figure out the label, if we don't it know yet. We do it once for the first
1651 * socket where we need this and remember it for the rest. */
1652
1653 r = socket_determine_selinux_label(s, &label);
1654 if (r < 0)
1655 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1656
1657 know_label = true;
1658 }
1659
1660 /* Apply the socket protocol */
1661 switch (p->address.type) {
1662
1663 case SOCK_STREAM:
1664 case SOCK_SEQPACKET:
1665 if (s->socket_protocol == IPPROTO_SCTP)
1666 p->address.protocol = s->socket_protocol;
1667 break;
1668
1669 case SOCK_DGRAM:
1670 if (s->socket_protocol == IPPROTO_UDPLITE)
1671 p->address.protocol = s->socket_protocol;
1672 break;
1673 }
1674
1675 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1676 if (p->fd < 0)
1677 return p->fd;
1678
1679 socket_apply_socket_options(s, p, p->fd);
1680 socket_symlink(s);
1681 break;
1682
1683 case SOCKET_SPECIAL:
1684
1685 p->fd = special_address_create(p->path, s->writable);
1686 if (p->fd < 0)
1687 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1688 break;
1689
1690 case SOCKET_FIFO:
1691
1692 p->fd = fifo_address_create(
1693 p->path,
1694 s->directory_mode,
1695 s->socket_mode);
1696 if (p->fd < 0)
1697 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1698
1699 socket_apply_fifo_options(s, p->fd);
1700 socket_symlink(s);
1701 break;
1702
1703 case SOCKET_MQUEUE:
1704
1705 p->fd = mq_address_create(
1706 p->path,
1707 s->socket_mode,
1708 s->mq_maxmsg,
1709 s->mq_msgsize);
1710 if (p->fd < 0)
1711 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1712 break;
1713
1714 case SOCKET_USB_FUNCTION: {
1715 _cleanup_free_ char *ep = NULL;
1716
1717 ep = path_make_absolute("ep0", p->path);
1718 if (!ep)
1719 return -ENOMEM;
1720
1721 p->fd = usbffs_address_create(ep);
1722 if (p->fd < 0)
1723 return p->fd;
1724
1725 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1726 if (r < 0)
1727 return r;
1728
1729 r = usbffs_dispatch_eps(p);
1730 if (r < 0)
1731 return r;
1732
1733 break;
1734 }
1735 default:
1736 assert_not_reached();
1737 }
1738 }
1739
1740 s = NULL;
1741 return 0;
1742 }
1743
1744 static void socket_unwatch_fds(Socket *s) {
1745 int r;
1746
1747 assert(s);
1748
1749 LIST_FOREACH(port, p, s->ports) {
1750 if (p->fd < 0)
1751 continue;
1752
1753 if (!p->event_source)
1754 continue;
1755
1756 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1757 if (r < 0)
1758 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1759 }
1760 }
1761
1762 static int socket_watch_fds(Socket *s) {
1763 int r;
1764
1765 assert(s);
1766
1767 LIST_FOREACH(port, p, s->ports) {
1768 if (p->fd < 0)
1769 continue;
1770
1771 if (p->event_source) {
1772 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1773 if (r < 0)
1774 goto fail;
1775 } else {
1776 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1777 if (r < 0)
1778 goto fail;
1779
1780 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1781 }
1782
1783 r = sd_event_source_set_ratelimit(p->event_source, s->poll_limit_interval, s->poll_limit_burst);
1784 if (r < 0)
1785 log_unit_debug_errno(UNIT(s), r, "Failed to set poll limit on I/O event source, ignoring: %m");
1786 }
1787
1788 return 0;
1789
1790 fail:
1791 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1792 socket_unwatch_fds(s);
1793 return r;
1794 }
1795
1796 enum {
1797 SOCKET_OPEN_NONE,
1798 SOCKET_OPEN_SOME,
1799 SOCKET_OPEN_ALL,
1800 };
1801
1802 static int socket_check_open(Socket *s) {
1803 bool have_open = false, have_closed = false;
1804
1805 assert(s);
1806
1807 LIST_FOREACH(port, p, s->ports) {
1808 if (p->fd < 0)
1809 have_closed = true;
1810 else
1811 have_open = true;
1812
1813 if (have_open && have_closed)
1814 return SOCKET_OPEN_SOME;
1815 }
1816
1817 if (have_open)
1818 return SOCKET_OPEN_ALL;
1819
1820 return SOCKET_OPEN_NONE;
1821 }
1822
1823 static void socket_set_state(Socket *s, SocketState state) {
1824 SocketState old_state;
1825 assert(s);
1826
1827 if (s->state != state)
1828 bus_unit_send_pending_change_signal(UNIT(s), false);
1829
1830 old_state = s->state;
1831 s->state = state;
1832
1833 if (!IN_SET(state,
1834 SOCKET_START_PRE,
1835 SOCKET_START_CHOWN,
1836 SOCKET_START_POST,
1837 SOCKET_STOP_PRE,
1838 SOCKET_STOP_PRE_SIGTERM,
1839 SOCKET_STOP_PRE_SIGKILL,
1840 SOCKET_STOP_POST,
1841 SOCKET_FINAL_SIGTERM,
1842 SOCKET_FINAL_SIGKILL,
1843 SOCKET_CLEANING)) {
1844
1845 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1846 socket_unwatch_control_pid(s);
1847 s->control_command = NULL;
1848 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1849 }
1850
1851 if (state != SOCKET_LISTENING)
1852 socket_unwatch_fds(s);
1853
1854 if (!IN_SET(state,
1855 SOCKET_START_CHOWN,
1856 SOCKET_START_POST,
1857 SOCKET_LISTENING,
1858 SOCKET_RUNNING,
1859 SOCKET_STOP_PRE,
1860 SOCKET_STOP_PRE_SIGTERM,
1861 SOCKET_STOP_PRE_SIGKILL,
1862 SOCKET_CLEANING))
1863 socket_close_fds(s);
1864
1865 if (state != old_state)
1866 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1867
1868 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1869 }
1870
1871 static int socket_coldplug(Unit *u) {
1872 Socket *s = SOCKET(u);
1873 int r;
1874
1875 assert(s);
1876 assert(s->state == SOCKET_DEAD);
1877
1878 if (s->deserialized_state == s->state)
1879 return 0;
1880
1881 if (pidref_is_set(&s->control_pid) &&
1882 pid_is_unwaited(s->control_pid.pid) &&
1883 IN_SET(s->deserialized_state,
1884 SOCKET_START_PRE,
1885 SOCKET_START_CHOWN,
1886 SOCKET_START_POST,
1887 SOCKET_STOP_PRE,
1888 SOCKET_STOP_PRE_SIGTERM,
1889 SOCKET_STOP_PRE_SIGKILL,
1890 SOCKET_STOP_POST,
1891 SOCKET_FINAL_SIGTERM,
1892 SOCKET_FINAL_SIGKILL,
1893 SOCKET_CLEANING)) {
1894
1895 r = unit_watch_pid(UNIT(s), s->control_pid.pid, /* exclusive= */ false);
1896 if (r < 0)
1897 return r;
1898
1899 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1900 if (r < 0)
1901 return r;
1902 }
1903
1904 if (IN_SET(s->deserialized_state,
1905 SOCKET_START_CHOWN,
1906 SOCKET_START_POST,
1907 SOCKET_LISTENING,
1908 SOCKET_RUNNING)) {
1909
1910 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1911 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1912 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1913 * and if there's a mismatch, warn loudly. */
1914
1915 r = socket_check_open(s);
1916 if (r == SOCKET_OPEN_NONE)
1917 log_unit_warning(UNIT(s),
1918 "Socket unit configuration has changed while unit has been running, "
1919 "no open socket file descriptor left. "
1920 "The socket unit is not functional until restarted.");
1921 else if (r == SOCKET_OPEN_SOME)
1922 log_unit_warning(UNIT(s),
1923 "Socket unit configuration has changed while unit has been running, "
1924 "and some socket file descriptors have not been opened yet. "
1925 "The socket unit is not fully functional until restarted.");
1926 }
1927
1928 if (s->deserialized_state == SOCKET_LISTENING) {
1929 r = socket_watch_fds(s);
1930 if (r < 0)
1931 return r;
1932 }
1933
1934 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1935 (void) unit_setup_exec_runtime(u);
1936
1937 socket_set_state(s, s->deserialized_state);
1938 return 0;
1939 }
1940
1941 static int socket_spawn(Socket *s, ExecCommand *c, PidRef *ret_pid) {
1942
1943 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1944 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1945 .stdin_fd = -EBADF,
1946 .stdout_fd = -EBADF,
1947 .stderr_fd = -EBADF,
1948 .exec_fd = -EBADF,
1949 };
1950 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1951 pid_t pid;
1952 int r;
1953
1954 assert(s);
1955 assert(c);
1956 assert(ret_pid);
1957
1958 r = unit_prepare_exec(UNIT(s));
1959 if (r < 0)
1960 return r;
1961
1962 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1963 if (r < 0)
1964 return r;
1965
1966 r = unit_set_exec_params(UNIT(s), &exec_params);
1967 if (r < 0)
1968 return r;
1969
1970 r = exec_spawn(UNIT(s),
1971 c,
1972 &s->exec_context,
1973 &exec_params,
1974 s->exec_runtime,
1975 &s->cgroup_context,
1976 &pid);
1977 if (r < 0)
1978 return r;
1979
1980 r = pidref_set_pid(&pidref, pid);
1981 if (r < 0)
1982 return r;
1983
1984 r = unit_watch_pid(UNIT(s), pidref.pid, /* exclusive= */ true);
1985 if (r < 0)
1986 return r;
1987
1988 *ret_pid = TAKE_PIDREF(pidref);
1989 return 0;
1990 }
1991
1992 static int socket_chown(Socket *s, PidRef *ret_pid) {
1993 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1994 int r;
1995
1996 assert(s);
1997
1998 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1999 if (r < 0)
2000 return r;
2001
2002 /* We have to resolve the user names out-of-process, hence
2003 * let's fork here. It's messy, but well, what can we do? */
2004
2005 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
2006 if (r < 0)
2007 return r;
2008 if (r == 0) {
2009 uid_t uid = UID_INVALID;
2010 gid_t gid = GID_INVALID;
2011
2012 /* Child */
2013
2014 if (!isempty(s->user)) {
2015 const char *user = s->user;
2016
2017 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
2018 if (r < 0) {
2019 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2020 _exit(EXIT_USER);
2021 }
2022 }
2023
2024 if (!isempty(s->group)) {
2025 const char *group = s->group;
2026
2027 r = get_group_creds(&group, &gid, 0);
2028 if (r < 0) {
2029 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2030 _exit(EXIT_GROUP);
2031 }
2032 }
2033
2034 LIST_FOREACH(port, p, s->ports) {
2035 const char *path = NULL;
2036
2037 if (p->type == SOCKET_SOCKET)
2038 path = socket_address_get_path(&p->address);
2039 else if (p->type == SOCKET_FIFO)
2040 path = p->path;
2041
2042 if (!path)
2043 continue;
2044
2045 if (chown(path, uid, gid) < 0) {
2046 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2047 _exit(EXIT_CHOWN);
2048 }
2049 }
2050
2051 _exit(EXIT_SUCCESS);
2052 }
2053
2054 r = unit_watch_pid(UNIT(s), pid.pid, /* exclusive= */ true);
2055 if (r < 0)
2056 return r;
2057
2058 *ret_pid = TAKE_PIDREF(pid);
2059 return 0;
2060 }
2061
2062 static void socket_enter_dead(Socket *s, SocketResult f) {
2063 assert(s);
2064
2065 if (s->result == SOCKET_SUCCESS)
2066 s->result = f;
2067
2068 if (s->result == SOCKET_SUCCESS)
2069 unit_log_success(UNIT(s));
2070 else
2071 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2072
2073 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2074
2075 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2076
2077 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2078
2079 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2080
2081 unit_unref_uid_gid(UNIT(s), true);
2082 }
2083
2084 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2085
2086 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2087 int r;
2088 assert(s);
2089
2090 if (s->result == SOCKET_SUCCESS)
2091 s->result = f;
2092
2093 socket_unwatch_control_pid(s);
2094 s->control_command_id = SOCKET_EXEC_STOP_POST;
2095 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2096
2097 if (s->control_command) {
2098 pidref_done(&s->control_pid);
2099
2100 r = socket_spawn(s, s->control_command, &s->control_pid);
2101 if (r < 0)
2102 goto fail;
2103
2104 socket_set_state(s, SOCKET_STOP_POST);
2105 } else
2106 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2107
2108 return;
2109
2110 fail:
2111 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2112 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2113 }
2114
2115 static int state_to_kill_operation(Socket *s, SocketState state) {
2116 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2117 return KILL_RESTART;
2118
2119 if (state == SOCKET_FINAL_SIGTERM)
2120 return KILL_TERMINATE;
2121
2122 return KILL_KILL;
2123 }
2124
2125 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2126 int r;
2127
2128 assert(s);
2129
2130 if (s->result == SOCKET_SUCCESS)
2131 s->result = f;
2132
2133 r = unit_kill_context(
2134 UNIT(s),
2135 &s->kill_context,
2136 state_to_kill_operation(s, state),
2137 /* main_pid= */ NULL,
2138 &s->control_pid,
2139 /* main_pid_alien= */ false);
2140 if (r < 0)
2141 goto fail;
2142
2143 if (r > 0) {
2144 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2145 if (r < 0)
2146 goto fail;
2147
2148 socket_set_state(s, state);
2149 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2150 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2151 else if (state == SOCKET_STOP_PRE_SIGKILL)
2152 socket_enter_stop_post(s, SOCKET_SUCCESS);
2153 else if (state == SOCKET_FINAL_SIGTERM)
2154 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2155 else
2156 socket_enter_dead(s, SOCKET_SUCCESS);
2157
2158 return;
2159
2160 fail:
2161 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2162
2163 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2164 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2165 else
2166 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2167 }
2168
2169 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2170 int r;
2171 assert(s);
2172
2173 if (s->result == SOCKET_SUCCESS)
2174 s->result = f;
2175
2176 socket_unwatch_control_pid(s);
2177 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2178 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2179
2180 if (s->control_command) {
2181 pidref_done(&s->control_pid);
2182
2183 r = socket_spawn(s, s->control_command, &s->control_pid);
2184 if (r < 0)
2185 goto fail;
2186
2187 socket_set_state(s, SOCKET_STOP_PRE);
2188 } else
2189 socket_enter_stop_post(s, SOCKET_SUCCESS);
2190
2191 return;
2192
2193 fail:
2194 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2195 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2196 }
2197
2198 static void socket_enter_listening(Socket *s) {
2199 int r;
2200 assert(s);
2201
2202 if (!s->accept && s->flush_pending) {
2203 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2204 flush_ports(s);
2205 }
2206
2207 r = socket_watch_fds(s);
2208 if (r < 0) {
2209 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2210 goto fail;
2211 }
2212
2213 socket_set_state(s, SOCKET_LISTENING);
2214 return;
2215
2216 fail:
2217 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2218 }
2219
2220 static void socket_enter_start_post(Socket *s) {
2221 int r;
2222 assert(s);
2223
2224 socket_unwatch_control_pid(s);
2225 s->control_command_id = SOCKET_EXEC_START_POST;
2226 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2227
2228 if (s->control_command) {
2229 pidref_done(&s->control_pid);
2230
2231 r = socket_spawn(s, s->control_command, &s->control_pid);
2232 if (r < 0) {
2233 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2234 goto fail;
2235 }
2236
2237 socket_set_state(s, SOCKET_START_POST);
2238 } else
2239 socket_enter_listening(s);
2240
2241 return;
2242
2243 fail:
2244 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2245 }
2246
2247 static void socket_enter_start_chown(Socket *s) {
2248 int r;
2249
2250 assert(s);
2251
2252 r = socket_open_fds(s);
2253 if (r < 0) {
2254 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2255 goto fail;
2256 }
2257
2258 if (!isempty(s->user) || !isempty(s->group)) {
2259
2260 socket_unwatch_control_pid(s);
2261 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2262 s->control_command = NULL;
2263
2264 r = socket_chown(s, &s->control_pid);
2265 if (r < 0) {
2266 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2267 goto fail;
2268 }
2269
2270 socket_set_state(s, SOCKET_START_CHOWN);
2271 } else
2272 socket_enter_start_post(s);
2273
2274 return;
2275
2276 fail:
2277 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2278 }
2279
2280 static void socket_enter_start_pre(Socket *s) {
2281 int r;
2282 assert(s);
2283
2284 socket_unwatch_control_pid(s);
2285
2286 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2287
2288 s->control_command_id = SOCKET_EXEC_START_PRE;
2289 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2290
2291 if (s->control_command) {
2292 pidref_done(&s->control_pid);
2293
2294 r = socket_spawn(s, s->control_command, &s->control_pid);
2295 if (r < 0) {
2296 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2297 goto fail;
2298 }
2299
2300 socket_set_state(s, SOCKET_START_PRE);
2301 } else
2302 socket_enter_start_chown(s);
2303
2304 return;
2305
2306 fail:
2307 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2308 }
2309
2310 static void flush_ports(Socket *s) {
2311 assert(s);
2312
2313 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2314 * anymore */
2315
2316 LIST_FOREACH(port, p, s->ports) {
2317 if (p->fd < 0)
2318 continue;
2319
2320 (void) flush_accept(p->fd);
2321 (void) flush_fd(p->fd);
2322 }
2323 }
2324
2325 static void socket_enter_running(Socket *s, int cfd_in) {
2326 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2327 * somewhere or close it. */
2328 _cleanup_close_ int cfd = cfd_in;
2329
2330 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2331 int r;
2332
2333 assert(s);
2334
2335 /* We don't take connections anymore if we are supposed to shut down anyway */
2336 if (unit_stop_pending(UNIT(s))) {
2337
2338 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2339
2340 if (cfd >= 0)
2341 goto refuse;
2342
2343 flush_ports(s);
2344 return;
2345 }
2346
2347 if (!ratelimit_below(&s->trigger_limit)) {
2348 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2349 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2350 goto refuse;
2351 }
2352
2353 if (cfd < 0) {
2354 bool pending = false;
2355 Unit *other;
2356
2357 /* If there's already a start pending don't bother to do anything */
2358 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2359 if (unit_active_or_pending(other)) {
2360 pending = true;
2361 break;
2362 }
2363
2364 if (!pending) {
2365 if (!UNIT_ISSET(s->service)) {
2366 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2367 "Service to activate vanished, refusing activation.");
2368 goto fail;
2369 }
2370
2371 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2372 if (r < 0)
2373 goto fail;
2374 }
2375
2376 socket_set_state(s, SOCKET_RUNNING);
2377 } else {
2378 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2379 Unit *service;
2380
2381 if (s->n_connections >= s->max_connections) {
2382 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2383 s->n_connections);
2384 goto refuse;
2385 }
2386
2387 if (s->max_connections_per_source > 0) {
2388 r = socket_acquire_peer(s, cfd, &p);
2389 if (r < 0) {
2390 if (ERRNO_IS_DISCONNECT(r))
2391 return;
2392 /* We didn't have enough resources to acquire peer information, let's fail. */
2393 goto fail;
2394 }
2395 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2396 _cleanup_free_ char *t = NULL;
2397
2398 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2399
2400 log_unit_warning(UNIT(s),
2401 "Too many incoming connections (%u) from source %s, dropping connection.",
2402 p->n_ref, strnull(t));
2403 goto refuse;
2404 }
2405 }
2406
2407 r = socket_load_service_unit(s, cfd, &service);
2408 if (r < 0) {
2409 if (ERRNO_IS_DISCONNECT(r))
2410 return;
2411 goto fail;
2412 }
2413
2414 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2415 false, UNIT_DEPENDENCY_IMPLICIT);
2416 if (r < 0)
2417 goto fail;
2418
2419 s->n_accepted++;
2420
2421 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2422 if (r < 0) {
2423 if (ERRNO_IS_DISCONNECT(r))
2424 return;
2425 goto fail;
2426 }
2427
2428 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2429 s->n_connections++;
2430
2431 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2432 if (r < 0) {
2433 /* We failed to activate the new service, but it still exists. Let's make sure the
2434 * service closes and forgets the connection fd again, immediately. */
2435 service_release_socket_fd(SERVICE(service));
2436 goto fail;
2437 }
2438
2439 /* Notify clients about changed counters */
2440 unit_add_to_dbus_queue(UNIT(s));
2441 }
2442
2443 TAKE_FD(cfd);
2444 return;
2445
2446 refuse:
2447 s->n_refused++;
2448 return;
2449
2450 fail:
2451 if (ERRNO_IS_RESOURCE(r))
2452 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2453 bus_error_message(&error, r));
2454 else
2455 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2456 cfd >= 0 ? "template" : "non-template",
2457 bus_error_message(&error, r));
2458
2459 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2460 }
2461
2462 static void socket_run_next(Socket *s) {
2463 int r;
2464
2465 assert(s);
2466 assert(s->control_command);
2467 assert(s->control_command->command_next);
2468
2469 socket_unwatch_control_pid(s);
2470
2471 s->control_command = s->control_command->command_next;
2472
2473 pidref_done(&s->control_pid);
2474
2475 r = socket_spawn(s, s->control_command, &s->control_pid);
2476 if (r < 0)
2477 goto fail;
2478
2479 return;
2480
2481 fail:
2482 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2483
2484 if (s->state == SOCKET_START_POST)
2485 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2486 else if (s->state == SOCKET_STOP_POST)
2487 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2488 else
2489 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2490 }
2491
2492 static int socket_start(Unit *u) {
2493 Socket *s = SOCKET(u);
2494 int r;
2495
2496 assert(s);
2497
2498 /* We cannot fulfill this request right now, try again later
2499 * please! */
2500 if (IN_SET(s->state,
2501 SOCKET_STOP_PRE,
2502 SOCKET_STOP_PRE_SIGKILL,
2503 SOCKET_STOP_PRE_SIGTERM,
2504 SOCKET_STOP_POST,
2505 SOCKET_FINAL_SIGTERM,
2506 SOCKET_FINAL_SIGKILL,
2507 SOCKET_CLEANING))
2508 return -EAGAIN;
2509
2510 /* Already on it! */
2511 if (IN_SET(s->state,
2512 SOCKET_START_PRE,
2513 SOCKET_START_CHOWN,
2514 SOCKET_START_POST))
2515 return 0;
2516
2517 /* Cannot run this without the service being around */
2518 if (UNIT_ISSET(s->service)) {
2519 Service *service;
2520
2521 service = SERVICE(UNIT_DEREF(s->service));
2522
2523 if (UNIT(service)->load_state != UNIT_LOADED)
2524 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT),
2525 "Socket service %s not loaded, refusing.", UNIT(service)->id);
2526
2527 /* If the service is already active we cannot start the
2528 * socket */
2529 if (!IN_SET(service->state,
2530 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
2531 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
2532 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY),
2533 "Socket service %s already active, refusing.", UNIT(service)->id);
2534 }
2535
2536 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2537
2538 r = unit_acquire_invocation_id(u);
2539 if (r < 0)
2540 return r;
2541
2542 s->result = SOCKET_SUCCESS;
2543 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2544
2545 u->reset_accounting = true;
2546
2547 socket_enter_start_pre(s);
2548 return 1;
2549 }
2550
2551 static int socket_stop(Unit *u) {
2552 Socket *s = SOCKET(u);
2553
2554 assert(s);
2555
2556 /* Already on it */
2557 if (IN_SET(s->state,
2558 SOCKET_STOP_PRE,
2559 SOCKET_STOP_PRE_SIGTERM,
2560 SOCKET_STOP_PRE_SIGKILL,
2561 SOCKET_STOP_POST,
2562 SOCKET_FINAL_SIGTERM,
2563 SOCKET_FINAL_SIGKILL))
2564 return 0;
2565
2566 /* If there's already something running we go directly into
2567 * kill mode. */
2568 if (IN_SET(s->state,
2569 SOCKET_START_PRE,
2570 SOCKET_START_CHOWN,
2571 SOCKET_START_POST)) {
2572 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2573 return -EAGAIN;
2574 }
2575
2576 /* If we are currently cleaning, then abort it, brutally. */
2577 if (s->state == SOCKET_CLEANING) {
2578 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2579 return 0;
2580 }
2581
2582 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2583
2584 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2585 return 1;
2586 }
2587
2588 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2589 Socket *s = SOCKET(u);
2590 int r;
2591
2592 assert(u);
2593 assert(f);
2594 assert(fds);
2595
2596 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2597 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2598 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2599 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2600
2601 if (pidref_is_set(&s->control_pid))
2602 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid.pid);
2603
2604 if (s->control_command_id >= 0)
2605 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2606
2607 LIST_FOREACH(port, p, s->ports) {
2608 int copy;
2609
2610 if (p->fd < 0)
2611 continue;
2612
2613 copy = fdset_put_dup(fds, p->fd);
2614 if (copy < 0)
2615 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2616
2617 if (p->type == SOCKET_SOCKET) {
2618 _cleanup_free_ char *t = NULL;
2619
2620 r = socket_address_print(&p->address, &t);
2621 if (r < 0)
2622 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2623
2624 if (socket_address_family(&p->address) == AF_NETLINK)
2625 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2626 else
2627 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2628 } else if (p->type == SOCKET_SPECIAL)
2629 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2630 else if (p->type == SOCKET_MQUEUE)
2631 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2632 else if (p->type == SOCKET_USB_FUNCTION)
2633 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2634 else {
2635 assert(p->type == SOCKET_FIFO);
2636 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2637 }
2638 }
2639
2640 return 0;
2641 }
2642
2643 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2644 Socket *s = SOCKET(u);
2645 int r;
2646
2647 assert(u);
2648 assert(key);
2649 assert(value);
2650
2651 if (streq(key, "state")) {
2652 SocketState state;
2653
2654 state = socket_state_from_string(value);
2655 if (state < 0)
2656 log_unit_debug(u, "Failed to parse state value: %s", value);
2657 else
2658 s->deserialized_state = state;
2659 } else if (streq(key, "result")) {
2660 SocketResult f;
2661
2662 f = socket_result_from_string(value);
2663 if (f < 0)
2664 log_unit_debug(u, "Failed to parse result value: %s", value);
2665 else if (f != SOCKET_SUCCESS)
2666 s->result = f;
2667
2668 } else if (streq(key, "n-accepted")) {
2669 unsigned k;
2670
2671 if (safe_atou(value, &k) < 0)
2672 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2673 else
2674 s->n_accepted += k;
2675 } else if (streq(key, "n-refused")) {
2676 unsigned k;
2677
2678 if (safe_atou(value, &k) < 0)
2679 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2680 else
2681 s->n_refused += k;
2682 } else if (streq(key, "control-pid")) {
2683 pidref_done(&s->control_pid);
2684 r = pidref_set_pidstr(&s->control_pid, value);
2685 if (r < 0)
2686 log_debug_errno(r, "Failed to pin control PID '%s', ignoring: %m", value);
2687 } else if (streq(key, "control-command")) {
2688 SocketExecCommand id;
2689
2690 id = socket_exec_command_from_string(value);
2691 if (id < 0)
2692 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2693 else {
2694 s->control_command_id = id;
2695 s->control_command = s->exec_command[id];
2696 }
2697 } else if (streq(key, "fifo")) {
2698 _cleanup_free_ char *fdv = NULL;
2699 bool found = false;
2700 int fd;
2701
2702 r = extract_first_word(&value, &fdv, NULL, 0);
2703 if (r <= 0) {
2704 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2705 return 0;
2706 }
2707
2708 fd = parse_fd(fdv);
2709 if (fd < 0 || !fdset_contains(fds, fd)) {
2710 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2711 return 0;
2712 }
2713
2714 LIST_FOREACH(port, p, s->ports)
2715 if (p->fd < 0 &&
2716 p->type == SOCKET_FIFO &&
2717 path_equal_or_inode_same(p->path, value, 0)) {
2718 p->fd = fdset_remove(fds, fd);
2719 found = true;
2720 break;
2721 }
2722 if (!found)
2723 log_unit_debug(u, "No matching fifo socket found: %s", value);
2724
2725 } else if (streq(key, "special")) {
2726 _cleanup_free_ char *fdv = NULL;
2727 bool found = false;
2728 int fd;
2729
2730 r = extract_first_word(&value, &fdv, NULL, 0);
2731 if (r <= 0) {
2732 log_unit_debug(u, "Failed to parse special value: %s", value);
2733 return 0;
2734 }
2735
2736 fd = parse_fd(fdv);
2737 if (fd < 0 || !fdset_contains(fds, fd)) {
2738 log_unit_debug(u, "Invalid special value: %s", fdv);
2739 return 0;
2740 }
2741
2742 LIST_FOREACH(port, p, s->ports)
2743 if (p->fd < 0 &&
2744 p->type == SOCKET_SPECIAL &&
2745 path_equal_or_inode_same(p->path, value, 0)) {
2746 p->fd = fdset_remove(fds, fd);
2747 found = true;
2748 break;
2749 }
2750 if (!found)
2751 log_unit_debug(u, "No matching special socket found: %s", value);
2752
2753 } else if (streq(key, "mqueue")) {
2754 _cleanup_free_ char *fdv = NULL;
2755 bool found = false;
2756 int fd;
2757
2758 r = extract_first_word(&value, &fdv, NULL, 0);
2759 if (r <= 0) {
2760 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2761 return 0;
2762 }
2763
2764 fd = parse_fd(fdv);
2765 if (fd < 0 || !fdset_contains(fds, fd)) {
2766 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2767 return 0;
2768 }
2769
2770 LIST_FOREACH(port, p, s->ports)
2771 if (p->fd < 0 &&
2772 p->type == SOCKET_MQUEUE &&
2773 streq(p->path, value)) {
2774 p->fd = fdset_remove(fds, fd);
2775 found = true;
2776 break;
2777 }
2778 if (!found)
2779 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2780
2781 } else if (streq(key, "socket")) {
2782 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2783 bool found = false;
2784 int fd, type;
2785
2786 r = extract_first_word(&value, &fdv, NULL, 0);
2787 if (r <= 0) {
2788 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2789 return 0;
2790 }
2791
2792 fd = parse_fd(fdv);
2793 if (fd < 0 || !fdset_contains(fds, fd)) {
2794 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2795 return 0;
2796 }
2797
2798 r = extract_first_word(&value, &typev, NULL, 0);
2799 if (r <= 0) {
2800 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2801 return 0;
2802 }
2803
2804 if (safe_atoi(typev, &type) < 0 || type < 0) {
2805 log_unit_debug(u, "Invalid socket type: %s", typev);
2806 return 0;
2807 }
2808
2809 LIST_FOREACH(port, p, s->ports)
2810 if (p->fd < 0 &&
2811 socket_address_is(&p->address, value, type)) {
2812 p->fd = fdset_remove(fds, fd);
2813 found = true;
2814 break;
2815 }
2816 if (!found)
2817 log_unit_debug(u, "No matching %s socket found: %s",
2818 socket_address_type_to_string(type), value);
2819
2820 } else if (streq(key, "netlink")) {
2821 _cleanup_free_ char *fdv = NULL;
2822 bool found = false;
2823 int fd;
2824
2825 r = extract_first_word(&value, &fdv, NULL, 0);
2826 if (r <= 0) {
2827 log_unit_debug(u, "Failed to parse socket value: %s", value);
2828 return 0;
2829 }
2830
2831 fd = parse_fd(fdv);
2832 if (fd < 0 || !fdset_contains(fds, fd)) {
2833 log_unit_debug(u, "Invalid socket value: %s", fdv);
2834 return 0;
2835 }
2836
2837 LIST_FOREACH(port, p, s->ports)
2838 if (p->fd < 0 &&
2839 socket_address_is_netlink(&p->address, value)) {
2840 p->fd = fdset_remove(fds, fd);
2841 found = true;
2842 break;
2843 }
2844 if (!found)
2845 log_unit_debug(u, "No matching netlink socket found: %s", value);
2846
2847 } else if (streq(key, "ffs")) {
2848 _cleanup_free_ char *fdv = NULL;
2849 bool found = false;
2850 int fd;
2851
2852 r = extract_first_word(&value, &fdv, NULL, 0);
2853 if (r <= 0) {
2854 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2855 return 0;
2856 }
2857
2858 fd = parse_fd(fdv);
2859 if (fd < 0 || !fdset_contains(fds, fd)) {
2860 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2861 return 0;
2862 }
2863
2864 LIST_FOREACH(port, p, s->ports)
2865 if (p->fd < 0 &&
2866 p->type == SOCKET_USB_FUNCTION &&
2867 path_equal_or_inode_same(p->path, value, 0)) {
2868 p->fd = fdset_remove(fds, fd);
2869 found = true;
2870 break;
2871 }
2872 if (!found)
2873 log_unit_debug(u, "No matching ffs socket found: %s", value);
2874
2875 } else
2876 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2877
2878 return 0;
2879 }
2880
2881 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2882 Socket *s = SOCKET(u);
2883
2884 assert(u);
2885
2886 LIST_FOREACH(port, p, s->ports) {
2887 int fd;
2888
2889 if (p->type != SOCKET_SOCKET)
2890 continue;
2891
2892 if (p->fd >= 0)
2893 continue;
2894
2895 FDSET_FOREACH(fd, fds) {
2896 if (socket_address_matches_fd(&p->address, fd)) {
2897 p->fd = fdset_remove(fds, fd);
2898 s->deserialized_state = SOCKET_LISTENING;
2899 break;
2900 }
2901 }
2902 }
2903 }
2904
2905 static UnitActiveState socket_active_state(Unit *u) {
2906 assert(u);
2907
2908 return state_translation_table[SOCKET(u)->state];
2909 }
2910
2911 static const char *socket_sub_state_to_string(Unit *u) {
2912 assert(u);
2913
2914 return socket_state_to_string(SOCKET(u)->state);
2915 }
2916
2917 const char* socket_port_type_to_string(SocketPort *p) {
2918
2919 assert(p);
2920
2921 switch (p->type) {
2922
2923 case SOCKET_SOCKET:
2924
2925 switch (p->address.type) {
2926
2927 case SOCK_STREAM:
2928 return "Stream";
2929
2930 case SOCK_DGRAM:
2931 return "Datagram";
2932
2933 case SOCK_SEQPACKET:
2934 return "SequentialPacket";
2935
2936 case SOCK_RAW:
2937 if (socket_address_family(&p->address) == AF_NETLINK)
2938 return "Netlink";
2939
2940 _fallthrough_;
2941 default:
2942 return NULL;
2943 }
2944
2945 case SOCKET_SPECIAL:
2946 return "Special";
2947
2948 case SOCKET_MQUEUE:
2949 return "MessageQueue";
2950
2951 case SOCKET_FIFO:
2952 return "FIFO";
2953
2954 case SOCKET_USB_FUNCTION:
2955 return "USBFunction";
2956
2957 default:
2958 return NULL;
2959 }
2960 }
2961
2962 SocketType socket_port_type_from_string(const char *s) {
2963 assert(s);
2964
2965 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2966 return SOCKET_SOCKET;
2967 else if (streq(s, "Special"))
2968 return SOCKET_SPECIAL;
2969 else if (streq(s, "MessageQueue"))
2970 return SOCKET_MQUEUE;
2971 else if (streq(s, "FIFO"))
2972 return SOCKET_FIFO;
2973 else if (streq(s, "USBFunction"))
2974 return SOCKET_USB_FUNCTION;
2975 else
2976 return _SOCKET_TYPE_INVALID;
2977 }
2978
2979 static bool socket_may_gc(Unit *u) {
2980 Socket *s = SOCKET(u);
2981
2982 assert(u);
2983
2984 return s->n_connections == 0;
2985 }
2986
2987 static int socket_accept_do(Socket *s, int fd) {
2988 int cfd;
2989
2990 assert(s);
2991 assert(fd >= 0);
2992
2993 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2994 if (cfd < 0)
2995 /* Convert transient network errors into clean and well-defined EAGAIN */
2996 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2997
2998 return cfd;
2999 }
3000
3001 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
3002 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
3003 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
3004 int cfd, r;
3005
3006 assert(s);
3007 assert(p);
3008 assert(fd >= 0);
3009
3010 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
3011 * connection socket is also properly associated with the cgroup. */
3012
3013 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
3014 goto shortcut;
3015
3016 r = bpf_firewall_supported();
3017 if (r < 0)
3018 return r;
3019 if (r == BPF_FIREWALL_UNSUPPORTED)
3020 goto shortcut;
3021
3022 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
3023 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
3024
3025 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
3026 if (r < 0)
3027 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
3028 if (r == 0) {
3029 /* Child */
3030
3031 pair[0] = safe_close(pair[0]);
3032
3033 cfd = socket_accept_do(s, fd);
3034 if (cfd == -EAGAIN) /* spurious accept() */
3035 _exit(EXIT_SUCCESS);
3036 if (cfd < 0) {
3037 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3038 _exit(EXIT_FAILURE);
3039 }
3040
3041 r = send_one_fd(pair[1], cfd, 0);
3042 if (r < 0) {
3043 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3044 _exit(EXIT_FAILURE);
3045 }
3046
3047 _exit(EXIT_SUCCESS);
3048 }
3049
3050 pair[1] = safe_close(pair[1]);
3051 cfd = receive_one_fd(pair[0], 0);
3052
3053 /* We synchronously wait for the helper, as it shouldn't be slow */
3054 r = wait_for_terminate_and_check("(sd-accept)", pid.pid, WAIT_LOG_ABNORMAL);
3055 if (r < 0) {
3056 safe_close(cfd);
3057 return r;
3058 }
3059
3060 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3061 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3062 if (cfd == -EIO)
3063 return -EAGAIN;
3064 if (cfd < 0)
3065 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3066
3067 return cfd;
3068
3069 shortcut:
3070 cfd = socket_accept_do(s, fd);
3071 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3072 return -EAGAIN;
3073 if (cfd < 0)
3074 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3075
3076 return cfd;
3077 }
3078
3079 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3080 SocketPort *p = ASSERT_PTR(userdata);
3081 int cfd = -EBADF;
3082
3083 assert(fd >= 0);
3084
3085 if (p->socket->state != SOCKET_LISTENING)
3086 return 0;
3087
3088 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3089
3090 if (revents != EPOLLIN) {
3091 if (revents & EPOLLHUP)
3092 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.");
3093 else
3094 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3095 goto fail;
3096 }
3097
3098 if (p->socket->accept &&
3099 p->type == SOCKET_SOCKET &&
3100 socket_address_can_accept(&p->address)) {
3101
3102 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3103 if (cfd == -EAGAIN) /* Spurious accept() */
3104 return 0;
3105 if (cfd < 0)
3106 goto fail;
3107
3108 socket_apply_socket_options(p->socket, p, cfd);
3109 }
3110
3111 socket_enter_running(p->socket, cfd);
3112 return 0;
3113
3114 fail:
3115 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3116 return 0;
3117 }
3118
3119 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3120 Socket *s = SOCKET(u);
3121 SocketResult f;
3122
3123 assert(s);
3124 assert(pid >= 0);
3125
3126 if (pid != s->control_pid.pid)
3127 return;
3128
3129 pidref_done(&s->control_pid);
3130
3131 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3132 f = SOCKET_SUCCESS;
3133 else if (code == CLD_EXITED)
3134 f = SOCKET_FAILURE_EXIT_CODE;
3135 else if (code == CLD_KILLED)
3136 f = SOCKET_FAILURE_SIGNAL;
3137 else if (code == CLD_DUMPED)
3138 f = SOCKET_FAILURE_CORE_DUMP;
3139 else
3140 assert_not_reached();
3141
3142 if (s->control_command) {
3143 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3144
3145 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3146 f = SOCKET_SUCCESS;
3147 }
3148
3149 unit_log_process_exit(
3150 u,
3151 "Control process",
3152 socket_exec_command_to_string(s->control_command_id),
3153 f == SOCKET_SUCCESS,
3154 code, status);
3155
3156 if (s->result == SOCKET_SUCCESS)
3157 s->result = f;
3158
3159 if (s->control_command &&
3160 s->control_command->command_next &&
3161 f == SOCKET_SUCCESS) {
3162
3163 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3164 socket_run_next(s);
3165 } else {
3166 s->control_command = NULL;
3167 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3168
3169 /* No further commands for this step, so let's figure
3170 * out what to do next */
3171
3172 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3173
3174 switch (s->state) {
3175
3176 case SOCKET_START_PRE:
3177 if (f == SOCKET_SUCCESS)
3178 socket_enter_start_chown(s);
3179 else
3180 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3181 break;
3182
3183 case SOCKET_START_CHOWN:
3184 if (f == SOCKET_SUCCESS)
3185 socket_enter_start_post(s);
3186 else
3187 socket_enter_stop_pre(s, f);
3188 break;
3189
3190 case SOCKET_START_POST:
3191 if (f == SOCKET_SUCCESS)
3192 socket_enter_listening(s);
3193 else
3194 socket_enter_stop_pre(s, f);
3195 break;
3196
3197 case SOCKET_STOP_PRE:
3198 case SOCKET_STOP_PRE_SIGTERM:
3199 case SOCKET_STOP_PRE_SIGKILL:
3200 socket_enter_stop_post(s, f);
3201 break;
3202
3203 case SOCKET_STOP_POST:
3204 case SOCKET_FINAL_SIGTERM:
3205 case SOCKET_FINAL_SIGKILL:
3206 socket_enter_dead(s, f);
3207 break;
3208
3209 case SOCKET_CLEANING:
3210
3211 if (s->clean_result == SOCKET_SUCCESS)
3212 s->clean_result = f;
3213
3214 socket_enter_dead(s, SOCKET_SUCCESS);
3215 break;
3216
3217 default:
3218 assert_not_reached();
3219 }
3220 }
3221
3222 /* Notify clients about changed exit status */
3223 unit_add_to_dbus_queue(u);
3224 }
3225
3226 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3227 Socket *s = SOCKET(userdata);
3228
3229 assert(s);
3230 assert(s->timer_event_source == source);
3231
3232 switch (s->state) {
3233
3234 case SOCKET_START_PRE:
3235 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3236 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3237 break;
3238
3239 case SOCKET_START_CHOWN:
3240 case SOCKET_START_POST:
3241 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3242 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3243 break;
3244
3245 case SOCKET_STOP_PRE:
3246 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3247 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3248 break;
3249
3250 case SOCKET_STOP_PRE_SIGTERM:
3251 if (s->kill_context.send_sigkill) {
3252 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3253 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3254 } else {
3255 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3256 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3257 }
3258 break;
3259
3260 case SOCKET_STOP_PRE_SIGKILL:
3261 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3262 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3263 break;
3264
3265 case SOCKET_STOP_POST:
3266 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3267 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3268 break;
3269
3270 case SOCKET_FINAL_SIGTERM:
3271 if (s->kill_context.send_sigkill) {
3272 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3273 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3274 } else {
3275 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3276 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3277 }
3278 break;
3279
3280 case SOCKET_FINAL_SIGKILL:
3281 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3282 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3283 break;
3284
3285 case SOCKET_CLEANING:
3286 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3287
3288 if (s->clean_result == SOCKET_SUCCESS)
3289 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3290
3291 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3292 break;
3293
3294 default:
3295 assert_not_reached();
3296 }
3297
3298 return 0;
3299 }
3300
3301 int socket_collect_fds(Socket *s, int **fds) {
3302 size_t k = 0, n = 0;
3303 int *rfds;
3304
3305 assert(s);
3306 assert(fds);
3307
3308 /* Called from the service code for requesting our fds */
3309
3310 LIST_FOREACH(port, p, s->ports) {
3311 if (p->fd >= 0)
3312 n++;
3313 n += p->n_auxiliary_fds;
3314 }
3315
3316 if (n <= 0) {
3317 *fds = NULL;
3318 return 0;
3319 }
3320
3321 rfds = new(int, n);
3322 if (!rfds)
3323 return -ENOMEM;
3324
3325 LIST_FOREACH(port, p, s->ports) {
3326 if (p->fd >= 0)
3327 rfds[k++] = p->fd;
3328 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3329 rfds[k++] = p->auxiliary_fds[i];
3330 }
3331
3332 assert(k == n);
3333
3334 *fds = rfds;
3335 return (int) n;
3336 }
3337
3338 static void socket_reset_failed(Unit *u) {
3339 Socket *s = SOCKET(u);
3340
3341 assert(s);
3342
3343 if (s->state == SOCKET_FAILED)
3344 socket_set_state(s, SOCKET_DEAD);
3345
3346 s->result = SOCKET_SUCCESS;
3347 s->clean_result = SOCKET_SUCCESS;
3348 }
3349
3350 void socket_connection_unref(Socket *s) {
3351 assert(s);
3352
3353 /* The service is dead. Yay!
3354 *
3355 * This is strictly for one-instance-per-connection
3356 * services. */
3357
3358 assert(s->n_connections > 0);
3359 s->n_connections--;
3360
3361 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3362 }
3363
3364 static void socket_trigger_notify(Unit *u, Unit *other) {
3365 Socket *s = SOCKET(u);
3366
3367 assert(u);
3368 assert(other);
3369
3370 /* Filter out invocations with bogus state */
3371 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3372 assert(other->type == UNIT_SERVICE);
3373
3374 /* Don't propagate state changes from the service if we are already down */
3375 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3376 return;
3377
3378 /* We don't care for the service state if we are in Accept=yes mode */
3379 if (s->accept)
3380 return;
3381
3382 /* Propagate start limit hit state */
3383 if (other->start_limit_hit) {
3384 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3385 return;
3386 }
3387
3388 /* Don't propagate anything if there's still a job queued */
3389 if (other->job)
3390 return;
3391
3392 if (IN_SET(SERVICE(other)->state,
3393 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3394 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3395 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
3396 socket_enter_listening(s);
3397
3398 if (SERVICE(other)->state == SERVICE_RUNNING)
3399 socket_set_state(s, SOCKET_RUNNING);
3400 }
3401
3402 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3403 Socket *s = SOCKET(u);
3404 usec_t t;
3405 int r;
3406
3407 if (!s->timer_event_source)
3408 return 0;
3409
3410 r = sd_event_source_get_time(s->timer_event_source, &t);
3411 if (r < 0)
3412 return r;
3413 if (t == USEC_INFINITY)
3414 return 0;
3415
3416 *timeout = t;
3417 return 1;
3418 }
3419
3420 char *socket_fdname(Socket *s) {
3421 assert(s);
3422
3423 /* Returns the name to use for $LISTEN_NAMES. If the user
3424 * didn't specify anything specifically, use the socket unit's
3425 * name as fallback. */
3426
3427 return s->fdname ?: UNIT(s)->id;
3428 }
3429
3430 static PidRef *socket_control_pid(Unit *u) {
3431 return &ASSERT_PTR(SOCKET(u))->control_pid;
3432 }
3433
3434 static int socket_clean(Unit *u, ExecCleanMask mask) {
3435 _cleanup_strv_free_ char **l = NULL;
3436 Socket *s = SOCKET(u);
3437 int r;
3438
3439 assert(s);
3440 assert(mask != 0);
3441
3442 if (s->state != SOCKET_DEAD)
3443 return -EBUSY;
3444
3445 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3446 if (r < 0)
3447 return r;
3448
3449 if (strv_isempty(l))
3450 return -EUNATCH;
3451
3452 socket_unwatch_control_pid(s);
3453 s->clean_result = SOCKET_SUCCESS;
3454 s->control_command = NULL;
3455 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3456
3457 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3458 if (r < 0)
3459 goto fail;
3460
3461 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3462 if (r < 0)
3463 goto fail;
3464
3465 socket_set_state(s, SOCKET_CLEANING);
3466 return 0;
3467
3468 fail:
3469 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3470 s->clean_result = SOCKET_FAILURE_RESOURCES;
3471 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3472 return r;
3473 }
3474
3475 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3476 Socket *s = SOCKET(u);
3477
3478 assert(s);
3479
3480 return exec_context_get_clean_mask(&s->exec_context, ret);
3481 }
3482
3483 static int socket_can_start(Unit *u) {
3484 Socket *s = SOCKET(u);
3485 int r;
3486
3487 assert(s);
3488
3489 r = unit_test_start_limit(u);
3490 if (r < 0) {
3491 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3492 return r;
3493 }
3494
3495 return 1;
3496 }
3497
3498 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3499 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3500 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3501 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3502 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3503 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3504 };
3505
3506 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3507
3508 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3509 [SOCKET_SUCCESS] = "success",
3510 [SOCKET_FAILURE_RESOURCES] = "resources",
3511 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3512 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3513 [SOCKET_FAILURE_SIGNAL] = "signal",
3514 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3515 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3516 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3517 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3518 };
3519
3520 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3521
3522 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3523 [SOCKET_TIMESTAMPING_OFF] = "off",
3524 [SOCKET_TIMESTAMPING_US] = "us",
3525 [SOCKET_TIMESTAMPING_NS] = "ns",
3526 };
3527
3528 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3529
3530 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3531 SocketTimestamping t;
3532 int r;
3533
3534 if (!p)
3535 return _SOCKET_TIMESTAMPING_INVALID;
3536
3537 t = socket_timestamping_from_string(p);
3538 if (t >= 0)
3539 return t;
3540
3541 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3542 * too. */
3543 if (streq(p, "nsec"))
3544 return SOCKET_TIMESTAMPING_NS;
3545 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3546 return SOCKET_TIMESTAMPING_US;
3547
3548 r = parse_boolean(p);
3549 if (r < 0)
3550 return _SOCKET_TIMESTAMPING_INVALID;
3551
3552 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3553 }
3554
3555 const UnitVTable socket_vtable = {
3556 .object_size = sizeof(Socket),
3557 .exec_context_offset = offsetof(Socket, exec_context),
3558 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3559 .kill_context_offset = offsetof(Socket, kill_context),
3560 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3561
3562 .sections =
3563 "Unit\0"
3564 "Socket\0"
3565 "Install\0",
3566 .private_section = "Socket",
3567
3568 .can_transient = true,
3569 .can_trigger = true,
3570 .can_fail = true,
3571
3572 .init = socket_init,
3573 .done = socket_done,
3574 .load = socket_load,
3575
3576 .coldplug = socket_coldplug,
3577
3578 .dump = socket_dump,
3579
3580 .start = socket_start,
3581 .stop = socket_stop,
3582
3583 .clean = socket_clean,
3584 .can_clean = socket_can_clean,
3585
3586 .get_timeout = socket_get_timeout,
3587
3588 .serialize = socket_serialize,
3589 .deserialize_item = socket_deserialize_item,
3590 .distribute_fds = socket_distribute_fds,
3591
3592 .active_state = socket_active_state,
3593 .sub_state_to_string = socket_sub_state_to_string,
3594
3595 .will_restart = unit_will_restart_default,
3596
3597 .may_gc = socket_may_gc,
3598
3599 .sigchld_event = socket_sigchld_event,
3600
3601 .trigger_notify = socket_trigger_notify,
3602
3603 .reset_failed = socket_reset_failed,
3604
3605 .control_pid = socket_control_pid,
3606
3607 .bus_set_property = bus_socket_set_property,
3608 .bus_commit_properties = bus_socket_commit_properties,
3609
3610 .status_message_formats = {
3611 .finished_start_job = {
3612 [JOB_DONE] = "Listening on %s.",
3613 [JOB_FAILED] = "Failed to listen on %s.",
3614 [JOB_TIMEOUT] = "Timed out starting %s.",
3615 },
3616 .finished_stop_job = {
3617 [JOB_DONE] = "Closed %s.",
3618 [JOB_FAILED] = "Failed stopping %s.",
3619 [JOB_TIMEOUT] = "Timed out stopping %s.",
3620 },
3621 },
3622
3623 .can_start = socket_can_start,
3624 };
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