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Merge pull request #28968 from DaanDeMeyer/rlimit
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase.h"
18 #include "constants.h"
19 #include "copy.h"
20 #include "dbus-socket.h"
21 #include "dbus-unit.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label-util.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN_DELUXE;
86 s->timeout_usec = u->manager->default_timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->default_std_output;
98 s->exec_context.std_error = u->manager->default_std_error;
99
100 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
101
102 s->trigger_limit.interval = USEC_INFINITY;
103 s->trigger_limit.burst = UINT_MAX;
104 }
105
106 static void socket_unwatch_control_pid(Socket *s) {
107 assert(s);
108
109 if (s->control_pid <= 0)
110 return;
111
112 unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid));
113 }
114
115 static void socket_cleanup_fd_list(SocketPort *p) {
116 assert(p);
117
118 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
119 p->auxiliary_fds = mfree(p->auxiliary_fds);
120 p->n_auxiliary_fds = 0;
121 }
122
123 SocketPort *socket_port_free(SocketPort *p) {
124 if (!p)
125 return NULL;
126
127 sd_event_source_unref(p->event_source);
128
129 socket_cleanup_fd_list(p);
130 safe_close(p->fd);
131 free(p->path);
132
133 return mfree(p);
134 }
135
136 void socket_free_ports(Socket *s) {
137 assert(s);
138
139 LIST_CLEAR(port, s->ports, socket_port_free);
140 }
141
142 static void socket_done(Unit *u) {
143 Socket *s = SOCKET(u);
144 SocketPeer *p;
145
146 assert(s);
147
148 socket_free_ports(s);
149
150 while ((p = set_steal_first(s->peers_by_address)))
151 p->socket = NULL;
152
153 s->peers_by_address = set_free(s->peers_by_address);
154
155 s->exec_runtime = exec_runtime_free(s->exec_runtime);
156 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
157 s->control_command = NULL;
158
159 socket_unwatch_control_pid(s);
160
161 unit_ref_unset(&s->service);
162
163 s->tcp_congestion = mfree(s->tcp_congestion);
164 s->bind_to_device = mfree(s->bind_to_device);
165
166 s->smack = mfree(s->smack);
167 s->smack_ip_in = mfree(s->smack_ip_in);
168 s->smack_ip_out = mfree(s->smack_ip_out);
169
170 strv_free(s->symlinks);
171
172 s->user = mfree(s->user);
173 s->group = mfree(s->group);
174
175 s->fdname = mfree(s->fdname);
176
177 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
178 }
179
180 static int socket_arm_timer(Socket *s, usec_t usec) {
181 int r;
182
183 assert(s);
184
185 if (s->timer_event_source) {
186 r = sd_event_source_set_time(s->timer_event_source, usec);
187 if (r < 0)
188 return r;
189
190 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
191 }
192
193 if (usec == USEC_INFINITY)
194 return 0;
195
196 r = sd_event_add_time(
197 UNIT(s)->manager->event,
198 &s->timer_event_source,
199 CLOCK_MONOTONIC,
200 usec, 0,
201 socket_dispatch_timer, s);
202 if (r < 0)
203 return r;
204
205 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
206
207 return 0;
208 }
209
210 static bool have_non_accept_socket(Socket *s) {
211 assert(s);
212
213 if (!s->accept)
214 return true;
215
216 LIST_FOREACH(port, p, s->ports) {
217
218 if (p->type != SOCKET_SOCKET)
219 return true;
220
221 if (!socket_address_can_accept(&p->address))
222 return true;
223 }
224
225 return false;
226 }
227
228 static int socket_add_mount_dependencies(Socket *s) {
229 int r;
230
231 assert(s);
232
233 LIST_FOREACH(port, p, s->ports) {
234 const char *path = NULL;
235
236 if (p->type == SOCKET_SOCKET)
237 path = socket_address_get_path(&p->address);
238 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
239 path = p->path;
240
241 if (!path)
242 continue;
243
244 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
245 if (r < 0)
246 return r;
247 }
248
249 return 0;
250 }
251
252 static int socket_add_device_dependencies(Socket *s) {
253 char *t;
254
255 assert(s);
256
257 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
258 return 0;
259
260 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
261 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
262 }
263
264 static int socket_add_default_dependencies(Socket *s) {
265 int r;
266 assert(s);
267
268 if (!UNIT(s)->default_dependencies)
269 return 0;
270
271 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
272 if (r < 0)
273 return r;
274
275 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
276 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279 }
280
281 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 }
283
284 static bool socket_has_exec(Socket *s) {
285 unsigned i;
286 assert(s);
287
288 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
289 if (s->exec_command[i])
290 return true;
291
292 return false;
293 }
294
295 static int socket_add_extras(Socket *s) {
296 Unit *u = UNIT(s);
297 int r;
298
299 assert(s);
300
301 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
302 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
303 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
304 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
305 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
306 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
307 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
308 * service starts are typical. */
309
310 if (s->trigger_limit.interval == USEC_INFINITY)
311 s->trigger_limit.interval = 2 * USEC_PER_SEC;
312
313 if (s->trigger_limit.burst == UINT_MAX) {
314 if (s->accept)
315 s->trigger_limit.burst = 200;
316 else
317 s->trigger_limit.burst = 20;
318 }
319
320 if (have_non_accept_socket(s)) {
321
322 if (!UNIT_DEREF(s->service)) {
323 Unit *x;
324
325 r = unit_load_related_unit(u, ".service", &x);
326 if (r < 0)
327 return r;
328
329 unit_ref_set(&s->service, u, x);
330 }
331
332 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
333 if (r < 0)
334 return r;
335 }
336
337 r = socket_add_mount_dependencies(s);
338 if (r < 0)
339 return r;
340
341 r = socket_add_device_dependencies(s);
342 if (r < 0)
343 return r;
344
345 r = unit_patch_contexts(u);
346 if (r < 0)
347 return r;
348
349 if (socket_has_exec(s)) {
350 r = unit_add_exec_dependencies(u, &s->exec_context);
351 if (r < 0)
352 return r;
353 }
354
355 r = unit_set_default_slice(u);
356 if (r < 0)
357 return r;
358
359 r = socket_add_default_dependencies(s);
360 if (r < 0)
361 return r;
362
363 return 0;
364 }
365
366 static const char *socket_find_symlink_target(Socket *s) {
367 const char *found = NULL;
368
369 LIST_FOREACH(port, p, s->ports) {
370 const char *f = NULL;
371
372 switch (p->type) {
373
374 case SOCKET_FIFO:
375 f = p->path;
376 break;
377
378 case SOCKET_SOCKET:
379 f = socket_address_get_path(&p->address);
380 break;
381
382 default:
383 break;
384 }
385
386 if (f) {
387 if (found)
388 return NULL;
389
390 found = f;
391 }
392 }
393
394 return found;
395 }
396
397 static int socket_verify(Socket *s) {
398 assert(s);
399 assert(UNIT(s)->load_state == UNIT_LOADED);
400
401 if (!s->ports)
402 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
403
404 if (s->accept && have_non_accept_socket(s))
405 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
406
407 if (s->accept && s->max_connections <= 0)
408 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
409
410 if (s->accept && UNIT_DEREF(s->service))
411 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
412
413 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
414 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
415
416 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
417 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.");
418
419 return 0;
420 }
421
422 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
423 assert(s);
424
425 if (s->peer.sa.sa_family == AF_INET)
426 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
427 else if (s->peer.sa.sa_family == AF_INET6)
428 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
429 else if (s->peer.sa.sa_family == AF_VSOCK)
430 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
431 else
432 assert_not_reached();
433 }
434
435 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
436 int r;
437
438 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
439 if (r != 0)
440 return r;
441
442 switch (x->peer.sa.sa_family) {
443 case AF_INET:
444 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
445 case AF_INET6:
446 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
447 case AF_VSOCK:
448 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
449 }
450 assert_not_reached();
451 }
452
453 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
454
455 static int socket_load(Unit *u) {
456 Socket *s = SOCKET(u);
457 int r;
458
459 assert(u);
460 assert(u->load_state == UNIT_STUB);
461
462 r = unit_load_fragment_and_dropin(u, true);
463 if (r < 0)
464 return r;
465
466 if (u->load_state != UNIT_LOADED)
467 return 0;
468
469 /* This is a new unit? Then let's add in some extras */
470 r = socket_add_extras(s);
471 if (r < 0)
472 return r;
473
474 return socket_verify(s);
475 }
476
477 static SocketPeer *socket_peer_new(void) {
478 SocketPeer *p;
479
480 p = new(SocketPeer, 1);
481 if (!p)
482 return NULL;
483
484 *p = (SocketPeer) {
485 .n_ref = 1,
486 };
487 return p;
488 }
489
490 static SocketPeer *socket_peer_free(SocketPeer *p) {
491 assert(p);
492
493 if (p->socket)
494 set_remove(p->socket->peers_by_address, p);
495
496 return mfree(p);
497 }
498
499 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
500
501 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
502 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
503 SocketPeer sa = {
504 .peer_salen = sizeof(union sockaddr_union),
505 }, *i;
506 int r;
507
508 assert(fd >= 0);
509 assert(s);
510
511 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
512 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
513
514 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
515 *p = NULL;
516 return 0;
517 }
518
519 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
520 if (r < 0)
521 return r;
522
523 i = set_get(s->peers_by_address, &sa);
524 if (i) {
525 *p = socket_peer_ref(i);
526 return 1;
527 }
528
529 remote = socket_peer_new();
530 if (!remote)
531 return log_oom();
532
533 remote->peer = sa.peer;
534 remote->peer_salen = sa.peer_salen;
535
536 r = set_put(s->peers_by_address, remote);
537 if (r < 0)
538 return r;
539
540 remote->socket = s;
541
542 *p = TAKE_PTR(remote);
543 return 1;
544 }
545
546 static const char* listen_lookup(int family, int type) {
547
548 if (family == AF_NETLINK)
549 return "ListenNetlink";
550
551 if (type == SOCK_STREAM)
552 return "ListenStream";
553 else if (type == SOCK_DGRAM)
554 return "ListenDatagram";
555 else if (type == SOCK_SEQPACKET)
556 return "ListenSequentialPacket";
557
558 assert_not_reached();
559 return NULL;
560 }
561
562 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
563 Socket *s = SOCKET(u);
564 const char *prefix2, *str;
565
566 assert(s);
567 assert(f);
568
569 prefix = strempty(prefix);
570 prefix2 = strjoina(prefix, "\t");
571
572 fprintf(f,
573 "%sSocket State: %s\n"
574 "%sResult: %s\n"
575 "%sClean Result: %s\n"
576 "%sBindIPv6Only: %s\n"
577 "%sBacklog: %u\n"
578 "%sSocketMode: %04o\n"
579 "%sDirectoryMode: %04o\n"
580 "%sKeepAlive: %s\n"
581 "%sNoDelay: %s\n"
582 "%sFreeBind: %s\n"
583 "%sTransparent: %s\n"
584 "%sBroadcast: %s\n"
585 "%sPassCredentials: %s\n"
586 "%sPassSecurity: %s\n"
587 "%sPassPacketInfo: %s\n"
588 "%sTCPCongestion: %s\n"
589 "%sRemoveOnStop: %s\n"
590 "%sWritable: %s\n"
591 "%sFileDescriptorName: %s\n"
592 "%sSELinuxContextFromNet: %s\n",
593 prefix, socket_state_to_string(s->state),
594 prefix, socket_result_to_string(s->result),
595 prefix, socket_result_to_string(s->clean_result),
596 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
597 prefix, s->backlog,
598 prefix, s->socket_mode,
599 prefix, s->directory_mode,
600 prefix, yes_no(s->keep_alive),
601 prefix, yes_no(s->no_delay),
602 prefix, yes_no(s->free_bind),
603 prefix, yes_no(s->transparent),
604 prefix, yes_no(s->broadcast),
605 prefix, yes_no(s->pass_cred),
606 prefix, yes_no(s->pass_sec),
607 prefix, yes_no(s->pass_pktinfo),
608 prefix, strna(s->tcp_congestion),
609 prefix, yes_no(s->remove_on_stop),
610 prefix, yes_no(s->writable),
611 prefix, socket_fdname(s),
612 prefix, yes_no(s->selinux_context_from_net));
613
614 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
615 fprintf(f,
616 "%sTimestamping: %s\n",
617 prefix, socket_timestamping_to_string(s->timestamping));
618
619 if (s->control_pid > 0)
620 fprintf(f,
621 "%sControl PID: "PID_FMT"\n",
622 prefix, s->control_pid);
623
624 if (s->bind_to_device)
625 fprintf(f,
626 "%sBindToDevice: %s\n",
627 prefix, s->bind_to_device);
628
629 if (s->accept)
630 fprintf(f,
631 "%sAccepted: %u\n"
632 "%sNConnections: %u\n"
633 "%sMaxConnections: %u\n"
634 "%sMaxConnectionsPerSource: %u\n",
635 prefix, s->n_accepted,
636 prefix, s->n_connections,
637 prefix, s->max_connections,
638 prefix, s->max_connections_per_source);
639 else
640 fprintf(f,
641 "%sFlushPending: %s\n",
642 prefix, yes_no(s->flush_pending));
643
644
645 if (s->priority >= 0)
646 fprintf(f,
647 "%sPriority: %i\n",
648 prefix, s->priority);
649
650 if (s->receive_buffer > 0)
651 fprintf(f,
652 "%sReceiveBuffer: %zu\n",
653 prefix, s->receive_buffer);
654
655 if (s->send_buffer > 0)
656 fprintf(f,
657 "%sSendBuffer: %zu\n",
658 prefix, s->send_buffer);
659
660 if (s->ip_tos >= 0)
661 fprintf(f,
662 "%sIPTOS: %i\n",
663 prefix, s->ip_tos);
664
665 if (s->ip_ttl >= 0)
666 fprintf(f,
667 "%sIPTTL: %i\n",
668 prefix, s->ip_ttl);
669
670 if (s->pipe_size > 0)
671 fprintf(f,
672 "%sPipeSize: %zu\n",
673 prefix, s->pipe_size);
674
675 if (s->mark >= 0)
676 fprintf(f,
677 "%sMark: %i\n",
678 prefix, s->mark);
679
680 if (s->mq_maxmsg > 0)
681 fprintf(f,
682 "%sMessageQueueMaxMessages: %li\n",
683 prefix, s->mq_maxmsg);
684
685 if (s->mq_msgsize > 0)
686 fprintf(f,
687 "%sMessageQueueMessageSize: %li\n",
688 prefix, s->mq_msgsize);
689
690 if (s->reuse_port)
691 fprintf(f,
692 "%sReusePort: %s\n",
693 prefix, yes_no(s->reuse_port));
694
695 if (s->smack)
696 fprintf(f,
697 "%sSmackLabel: %s\n",
698 prefix, s->smack);
699
700 if (s->smack_ip_in)
701 fprintf(f,
702 "%sSmackLabelIPIn: %s\n",
703 prefix, s->smack_ip_in);
704
705 if (s->smack_ip_out)
706 fprintf(f,
707 "%sSmackLabelIPOut: %s\n",
708 prefix, s->smack_ip_out);
709
710 if (!isempty(s->user) || !isempty(s->group))
711 fprintf(f,
712 "%sSocketUser: %s\n"
713 "%sSocketGroup: %s\n",
714 prefix, strna(s->user),
715 prefix, strna(s->group));
716
717 if (timestamp_is_set(s->keep_alive_time))
718 fprintf(f,
719 "%sKeepAliveTimeSec: %s\n",
720 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
721
722 if (s->keep_alive_interval > 0)
723 fprintf(f,
724 "%sKeepAliveIntervalSec: %s\n",
725 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
726
727 if (s->keep_alive_cnt > 0)
728 fprintf(f,
729 "%sKeepAliveProbes: %u\n",
730 prefix, s->keep_alive_cnt);
731
732 if (s->defer_accept > 0)
733 fprintf(f,
734 "%sDeferAcceptSec: %s\n",
735 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
736
737 LIST_FOREACH(port, p, s->ports) {
738
739 switch (p->type) {
740 case SOCKET_SOCKET: {
741 _cleanup_free_ char *k = NULL;
742 int r;
743
744 r = socket_address_print(&p->address, &k);
745 if (r < 0) {
746 errno = -r;
747 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
748 } else
749 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
750 break;
751 }
752 case SOCKET_SPECIAL:
753 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
754 break;
755 case SOCKET_USB_FUNCTION:
756 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
757 break;
758 case SOCKET_MQUEUE:
759 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
760 break;
761 default:
762 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
763 }
764 }
765
766 fprintf(f,
767 "%sTriggerLimitIntervalSec: %s\n"
768 "%sTriggerLimitBurst: %u\n",
769 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
770 prefix, s->trigger_limit.burst);
771
772 str = ip_protocol_to_name(s->socket_protocol);
773 if (str)
774 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
775
776 if (!strv_isempty(s->symlinks)) {
777 fprintf(f, "%sSymlinks:", prefix);
778 STRV_FOREACH(q, s->symlinks)
779 fprintf(f, " %s", *q);
780
781 fprintf(f, "\n");
782 }
783
784 fprintf(f,
785 "%sTimeoutSec: %s\n",
786 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
787
788 exec_context_dump(&s->exec_context, f, prefix);
789 kill_context_dump(&s->kill_context, f, prefix);
790
791 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
792 if (!s->exec_command[c])
793 continue;
794
795 fprintf(f, "%s-> %s:\n",
796 prefix, socket_exec_command_to_string(c));
797
798 exec_command_dump_list(s->exec_command[c], f, prefix2);
799 }
800
801 cgroup_context_dump(UNIT(s), f, prefix);
802 }
803
804 static int instance_from_socket(int fd, unsigned nr, char **instance) {
805 socklen_t l;
806 char *r;
807 union sockaddr_union local, remote;
808
809 assert(fd >= 0);
810 assert(instance);
811
812 l = sizeof(local);
813 if (getsockname(fd, &local.sa, &l) < 0)
814 return -errno;
815
816 l = sizeof(remote);
817 if (getpeername(fd, &remote.sa, &l) < 0)
818 return -errno;
819
820 switch (local.sa.sa_family) {
821
822 case AF_INET: {
823 uint32_t
824 a = be32toh(local.in.sin_addr.s_addr),
825 b = be32toh(remote.in.sin_addr.s_addr);
826
827 if (asprintf(&r,
828 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
829 nr,
830 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
831 be16toh(local.in.sin_port),
832 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
833 be16toh(remote.in.sin_port)) < 0)
834 return -ENOMEM;
835
836 break;
837 }
838
839 case AF_INET6: {
840 static const unsigned char ipv4_prefix[] = {
841 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
842 };
843
844 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
845 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
846 const uint8_t
847 *a = local.in6.sin6_addr.s6_addr+12,
848 *b = remote.in6.sin6_addr.s6_addr+12;
849
850 if (asprintf(&r,
851 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
852 nr,
853 a[0], a[1], a[2], a[3],
854 be16toh(local.in6.sin6_port),
855 b[0], b[1], b[2], b[3],
856 be16toh(remote.in6.sin6_port)) < 0)
857 return -ENOMEM;
858 } else {
859 if (asprintf(&r,
860 "%u-%s:%u-%s:%u",
861 nr,
862 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
863 be16toh(local.in6.sin6_port),
864 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
865 be16toh(remote.in6.sin6_port)) < 0)
866 return -ENOMEM;
867 }
868
869 break;
870 }
871
872 case AF_UNIX: {
873 struct ucred ucred;
874 int k;
875
876 k = getpeercred(fd, &ucred);
877 if (k >= 0) {
878 if (asprintf(&r,
879 "%u-"PID_FMT"-"UID_FMT,
880 nr, ucred.pid, ucred.uid) < 0)
881 return -ENOMEM;
882 } else if (k == -ENODATA) {
883 /* This handles the case where somebody is
884 * connecting from another pid/uid namespace
885 * (e.g. from outside of our container). */
886 if (asprintf(&r,
887 "%u-unknown",
888 nr) < 0)
889 return -ENOMEM;
890 } else
891 return k;
892
893 break;
894 }
895
896 case AF_VSOCK:
897 if (asprintf(&r,
898 "%u-%u:%u-%u:%u",
899 nr,
900 local.vm.svm_cid, local.vm.svm_port,
901 remote.vm.svm_cid, remote.vm.svm_port) < 0)
902 return -ENOMEM;
903
904 break;
905
906 default:
907 assert_not_reached();
908 }
909
910 *instance = r;
911 return 0;
912 }
913
914 static void socket_close_fds(Socket *s) {
915 assert(s);
916
917 LIST_FOREACH(port, p, s->ports) {
918 bool was_open;
919
920 was_open = p->fd >= 0;
921
922 p->event_source = sd_event_source_disable_unref(p->event_source);
923 p->fd = safe_close(p->fd);
924 socket_cleanup_fd_list(p);
925
926 /* One little note: we should normally not delete any sockets in the file system here! After all some
927 * other process we spawned might still have a reference of this fd and wants to continue to use
928 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
929 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
930 * anyway, but only then. */
931
932 if (!was_open || !s->remove_on_stop)
933 continue;
934
935 switch (p->type) {
936
937 case SOCKET_FIFO:
938 (void) unlink(p->path);
939 break;
940
941 case SOCKET_MQUEUE:
942 (void) mq_unlink(p->path);
943 break;
944
945 case SOCKET_SOCKET:
946 (void) socket_address_unlink(&p->address);
947 break;
948
949 default:
950 break;
951 }
952 }
953
954 if (s->remove_on_stop)
955 STRV_FOREACH(i, s->symlinks)
956 (void) unlink(*i);
957
958 /* Note that we don't return NULL here, since s has not been freed. */
959 }
960
961 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
962 int r;
963
964 assert(s);
965 assert(p);
966 assert(fd >= 0);
967
968 if (s->keep_alive) {
969 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
970 if (r < 0)
971 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
972 }
973
974 if (timestamp_is_set(s->keep_alive_time)) {
975 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
976 if (r < 0)
977 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
978 }
979
980 if (s->keep_alive_interval > 0) {
981 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
982 if (r < 0)
983 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
984 }
985
986 if (s->keep_alive_cnt > 0) {
987 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
988 if (r < 0)
989 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
990 }
991
992 if (s->defer_accept > 0) {
993 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
994 if (r < 0)
995 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
996 }
997
998 if (s->no_delay) {
999 if (s->socket_protocol == IPPROTO_SCTP) {
1000 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1001 if (r < 0)
1002 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1003 } else {
1004 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1005 if (r < 0)
1006 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1007 }
1008 }
1009
1010 if (s->broadcast) {
1011 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1012 if (r < 0)
1013 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1014 }
1015
1016 if (s->pass_cred) {
1017 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1018 if (r < 0)
1019 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1020 }
1021
1022 if (s->pass_sec) {
1023 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1024 if (r < 0)
1025 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1026 }
1027
1028 if (s->pass_pktinfo) {
1029 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1030 if (r < 0)
1031 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1032 }
1033
1034 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1035 r = setsockopt_int(fd, SOL_SOCKET,
1036 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1037 true);
1038 if (r < 0)
1039 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1040 }
1041
1042 if (s->priority >= 0) {
1043 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1044 if (r < 0)
1045 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1046 }
1047
1048 if (s->receive_buffer > 0) {
1049 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1050 if (r < 0)
1051 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1052 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1053 }
1054
1055 if (s->send_buffer > 0) {
1056 r = fd_set_sndbuf(fd, s->send_buffer, false);
1057 if (r < 0)
1058 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1059 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1060 }
1061
1062 if (s->mark >= 0) {
1063 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1064 if (r < 0)
1065 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1066 }
1067
1068 if (s->ip_tos >= 0) {
1069 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1070 if (r < 0)
1071 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1072 }
1073
1074 if (s->ip_ttl >= 0) {
1075 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1076 if (r < 0)
1077 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1078 }
1079
1080 if (s->tcp_congestion)
1081 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1082 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1083
1084 if (s->smack_ip_in) {
1085 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1086 if (r < 0)
1087 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1088 }
1089
1090 if (s->smack_ip_out) {
1091 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1092 if (r < 0)
1093 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1094 }
1095 }
1096
1097 static void socket_apply_fifo_options(Socket *s, int fd) {
1098 int r;
1099
1100 assert(s);
1101 assert(fd >= 0);
1102
1103 if (s->pipe_size > 0)
1104 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1105 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1106
1107 if (s->smack) {
1108 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1109 if (r < 0)
1110 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1111 }
1112 }
1113
1114 static int fifo_address_create(
1115 const char *path,
1116 mode_t directory_mode,
1117 mode_t socket_mode) {
1118
1119 _cleanup_close_ int fd = -EBADF;
1120 mode_t old_mask;
1121 struct stat st;
1122 int r;
1123
1124 assert(path);
1125
1126 (void) mkdir_parents_label(path, directory_mode);
1127
1128 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1129 if (r < 0)
1130 return r;
1131
1132 /* Enforce the right access mode for the fifo */
1133 old_mask = umask(~socket_mode);
1134
1135 /* Include the original umask in our mask */
1136 (void) umask(~socket_mode | old_mask);
1137
1138 r = mkfifo(path, socket_mode);
1139 (void) umask(old_mask);
1140
1141 if (r < 0 && errno != EEXIST) {
1142 r = -errno;
1143 goto fail;
1144 }
1145
1146 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1147 if (fd < 0) {
1148 r = -errno;
1149 goto fail;
1150 }
1151
1152 mac_selinux_create_file_clear();
1153
1154 if (fstat(fd, &st) < 0) {
1155 r = -errno;
1156 goto fail;
1157 }
1158
1159 if (!S_ISFIFO(st.st_mode) ||
1160 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1161 st.st_uid != getuid() ||
1162 st.st_gid != getgid()) {
1163 r = -EEXIST;
1164 goto fail;
1165 }
1166
1167 return TAKE_FD(fd);
1168
1169 fail:
1170 mac_selinux_create_file_clear();
1171 return r;
1172 }
1173
1174 static int special_address_create(const char *path, bool writable) {
1175 _cleanup_close_ int fd = -EBADF;
1176 struct stat st;
1177
1178 assert(path);
1179
1180 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1181 if (fd < 0)
1182 return -errno;
1183
1184 if (fstat(fd, &st) < 0)
1185 return -errno;
1186
1187 /* Check whether this is a /proc, /sys or /dev file or char device */
1188 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1189 return -EEXIST;
1190
1191 return TAKE_FD(fd);
1192 }
1193
1194 static int usbffs_address_create(const char *path) {
1195 _cleanup_close_ int fd = -EBADF;
1196 struct stat st;
1197
1198 assert(path);
1199
1200 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1201 if (fd < 0)
1202 return -errno;
1203
1204 if (fstat(fd, &st) < 0)
1205 return -errno;
1206
1207 /* Check whether this is a regular file (ffs endpoint) */
1208 if (!S_ISREG(st.st_mode))
1209 return -EEXIST;
1210
1211 return TAKE_FD(fd);
1212 }
1213
1214 static int mq_address_create(
1215 const char *path,
1216 mode_t mq_mode,
1217 long maxmsg,
1218 long msgsize) {
1219
1220 _cleanup_close_ int fd = -EBADF;
1221 struct stat st;
1222 mode_t old_mask;
1223 struct mq_attr _attr, *attr = NULL;
1224
1225 assert(path);
1226
1227 if (maxmsg > 0 && msgsize > 0) {
1228 _attr = (struct mq_attr) {
1229 .mq_flags = O_NONBLOCK,
1230 .mq_maxmsg = maxmsg,
1231 .mq_msgsize = msgsize,
1232 };
1233 attr = &_attr;
1234 }
1235
1236 /* Enforce the right access mode for the mq */
1237 old_mask = umask(~mq_mode);
1238
1239 /* Include the original umask in our mask */
1240 (void) umask(~mq_mode | old_mask);
1241 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1242 (void) umask(old_mask);
1243
1244 if (fd < 0)
1245 return -errno;
1246
1247 if (fstat(fd, &st) < 0)
1248 return -errno;
1249
1250 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1251 st.st_uid != getuid() ||
1252 st.st_gid != getgid())
1253 return -EEXIST;
1254
1255 return TAKE_FD(fd);
1256 }
1257
1258 static int socket_symlink(Socket *s) {
1259 const char *p;
1260 int r;
1261
1262 assert(s);
1263
1264 p = socket_find_symlink_target(s);
1265 if (!p)
1266 return 0;
1267
1268 STRV_FOREACH(i, s->symlinks) {
1269 (void) mkdir_parents_label(*i, s->directory_mode);
1270
1271 r = symlink_idempotent(p, *i, false);
1272
1273 if (r == -EEXIST && s->remove_on_stop) {
1274 /* If there's already something where we want to create the symlink, and the destructive
1275 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1276 * again. */
1277
1278 if (unlink(*i) >= 0)
1279 r = symlink_idempotent(p, *i, false);
1280 }
1281
1282 if (r < 0)
1283 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1284 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1285 }
1286
1287 return 0;
1288 }
1289
1290 static int usbffs_write_descs(int fd, Service *s) {
1291 int r;
1292
1293 if (!s->usb_function_descriptors || !s->usb_function_strings)
1294 return -EINVAL;
1295
1296 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1297 if (r < 0)
1298 return r;
1299
1300 return copy_file_fd(s->usb_function_strings, fd, 0);
1301 }
1302
1303 static int usbffs_select_ep(const struct dirent *d) {
1304 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1305 }
1306
1307 static int usbffs_dispatch_eps(SocketPort *p) {
1308 _cleanup_free_ struct dirent **ent = NULL;
1309 size_t n, k;
1310 int r;
1311
1312 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1313 if (r < 0)
1314 return -errno;
1315
1316 n = (size_t) r;
1317 p->auxiliary_fds = new(int, n);
1318 if (!p->auxiliary_fds) {
1319 r = -ENOMEM;
1320 goto clear;
1321 }
1322
1323 p->n_auxiliary_fds = n;
1324
1325 k = 0;
1326 for (size_t i = 0; i < n; ++i) {
1327 _cleanup_free_ char *ep = NULL;
1328
1329 ep = path_make_absolute(ent[i]->d_name, p->path);
1330 if (!ep) {
1331 r = -ENOMEM;
1332 goto fail;
1333 }
1334
1335 path_simplify(ep);
1336
1337 r = usbffs_address_create(ep);
1338 if (r < 0)
1339 goto fail;
1340
1341 p->auxiliary_fds[k++] = r;
1342 }
1343
1344 r = 0;
1345 goto clear;
1346
1347 fail:
1348 close_many(p->auxiliary_fds, k);
1349 p->auxiliary_fds = mfree(p->auxiliary_fds);
1350 p->n_auxiliary_fds = 0;
1351
1352 clear:
1353 free_many((void**) ent, n);
1354 return r;
1355 }
1356
1357 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1358 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1359 *
1360 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1361 * instance name.
1362 */
1363
1364 if (UNIT_ISSET(s->service)) {
1365 *ret = UNIT_DEREF(s->service);
1366 return 0;
1367 }
1368
1369 if (!s->accept)
1370 return -ENODATA;
1371
1372 /* Build the instance name and load the unit */
1373 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1374 int r;
1375
1376 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1377 if (r < 0)
1378 return r;
1379
1380 if (cfd >= 0) {
1381 r = instance_from_socket(cfd, s->n_accepted, &instance);
1382 if (r < 0) {
1383 if (ERRNO_IS_DISCONNECT(r))
1384 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1385 * different errors. This connection is over, but the socket unit lives on. */
1386 return log_unit_debug_errno(UNIT(s), r,
1387 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1388 errno_to_name(r));
1389 return r;
1390 }
1391 }
1392
1393 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1394 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1395 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1396 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1397 if (r < 0)
1398 return r;
1399
1400 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1401 }
1402
1403 static int socket_determine_selinux_label(Socket *s, char **ret) {
1404 int r;
1405
1406 assert(s);
1407 assert(ret);
1408
1409 Unit *service;
1410 ExecCommand *c;
1411 const char *exec_context;
1412 _cleanup_free_ char *path = NULL;
1413
1414 r = socket_load_service_unit(s, -1, &service);
1415 if (r == -ENODATA)
1416 goto no_label;
1417 if (r < 0)
1418 return r;
1419
1420 exec_context = SERVICE(service)->exec_context.selinux_context;
1421 if (exec_context) {
1422 char *con;
1423
1424 con = strdup(exec_context);
1425 if (!con)
1426 return -ENOMEM;
1427
1428 *ret = TAKE_PTR(con);
1429 return 0;
1430 }
1431
1432 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1433 if (!c)
1434 goto no_label;
1435
1436 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1437 if (r < 0)
1438 goto no_label;
1439
1440 r = mac_selinux_get_create_label_from_exe(path, ret);
1441 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1442 goto no_label;
1443 return r;
1444
1445 no_label:
1446 *ret = NULL;
1447 return 0;
1448 }
1449
1450 static int socket_address_listen_do(
1451 Socket *s,
1452 const SocketAddress *address,
1453 const char *label) {
1454
1455 assert(s);
1456 assert(address);
1457
1458 return socket_address_listen(
1459 address,
1460 SOCK_CLOEXEC|SOCK_NONBLOCK,
1461 s->backlog,
1462 s->bind_ipv6_only,
1463 s->bind_to_device,
1464 s->reuse_port,
1465 s->free_bind,
1466 s->transparent,
1467 s->directory_mode,
1468 s->socket_mode,
1469 label);
1470 }
1471
1472 #define log_address_error_errno(u, address, error, fmt) \
1473 ({ \
1474 _cleanup_free_ char *_t = NULL; \
1475 \
1476 (void) socket_address_print(address, &_t); \
1477 log_unit_error_errno(u, error, fmt, strna(_t)); \
1478 })
1479
1480 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1481 int r;
1482
1483 assert(address);
1484 assert(context);
1485
1486 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1487
1488 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1489 r = bpf_firewall_supported();
1490 if (r < 0)
1491 return r;
1492 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1493 return true;
1494 }
1495
1496 return exec_needs_network_namespace(context);
1497 }
1498
1499 static int socket_address_listen_in_cgroup(
1500 Socket *s,
1501 const SocketAddress *address,
1502 const char *label) {
1503
1504 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1505 int fd, r;
1506 pid_t pid;
1507
1508 assert(s);
1509 assert(address);
1510
1511 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1512 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1513 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1514 * such. */
1515
1516 r = fork_needed(address, &s->exec_context);
1517 if (r < 0)
1518 return r;
1519 if (r == 0) {
1520 /* Shortcut things... */
1521 fd = socket_address_listen_do(s, address, label);
1522 if (fd < 0)
1523 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1524
1525 return fd;
1526 }
1527
1528 r = unit_setup_exec_runtime(UNIT(s));
1529 if (r < 0)
1530 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1531
1532 if (s->exec_context.network_namespace_path &&
1533 s->exec_runtime &&
1534 s->exec_runtime->shared &&
1535 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1536 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1537 if (r < 0)
1538 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1539 }
1540
1541 if (s->exec_context.ipc_namespace_path &&
1542 s->exec_runtime &&
1543 s->exec_runtime->shared &&
1544 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1545 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1546 if (r < 0)
1547 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1548 }
1549
1550 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1551 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1552
1553 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1554 if (r < 0)
1555 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1556 if (r == 0) {
1557 /* Child */
1558
1559 pair[0] = safe_close(pair[0]);
1560
1561 if (exec_needs_network_namespace(&s->exec_context) &&
1562 s->exec_runtime &&
1563 s->exec_runtime->shared &&
1564 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1565
1566 if (ns_type_supported(NAMESPACE_NET)) {
1567 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1568 if (r < 0) {
1569 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1570 _exit(EXIT_NETWORK);
1571 }
1572 } else if (s->exec_context.network_namespace_path) {
1573 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1574 _exit(EXIT_NETWORK);
1575 } else
1576 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1577 }
1578
1579 fd = socket_address_listen_do(s, address, label);
1580 if (fd < 0) {
1581 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1582 _exit(EXIT_FAILURE);
1583 }
1584
1585 r = send_one_fd(pair[1], fd, 0);
1586 if (r < 0) {
1587 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1588 _exit(EXIT_FAILURE);
1589 }
1590
1591 _exit(EXIT_SUCCESS);
1592 }
1593
1594 pair[1] = safe_close(pair[1]);
1595 fd = receive_one_fd(pair[0], 0);
1596
1597 /* We synchronously wait for the helper, as it shouldn't be slow */
1598 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1599 if (r < 0) {
1600 safe_close(fd);
1601 return r;
1602 }
1603
1604 if (fd < 0)
1605 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1606
1607 return fd;
1608 }
1609
1610 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1611
1612 static int socket_open_fds(Socket *orig_s) {
1613 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1614 _cleanup_(mac_selinux_freep) char *label = NULL;
1615 bool know_label = false;
1616 int r;
1617
1618 assert(s);
1619
1620 LIST_FOREACH(port, p, s->ports) {
1621
1622 if (p->fd >= 0)
1623 continue;
1624
1625 switch (p->type) {
1626
1627 case SOCKET_SOCKET:
1628
1629 if (!know_label) {
1630 /* Figure out the label, if we don't it know yet. We do it once for the first
1631 * socket where we need this and remember it for the rest. */
1632
1633 r = socket_determine_selinux_label(s, &label);
1634 if (r < 0)
1635 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1636
1637 know_label = true;
1638 }
1639
1640 /* Apply the socket protocol */
1641 switch (p->address.type) {
1642
1643 case SOCK_STREAM:
1644 case SOCK_SEQPACKET:
1645 if (s->socket_protocol == IPPROTO_SCTP)
1646 p->address.protocol = s->socket_protocol;
1647 break;
1648
1649 case SOCK_DGRAM:
1650 if (s->socket_protocol == IPPROTO_UDPLITE)
1651 p->address.protocol = s->socket_protocol;
1652 break;
1653 }
1654
1655 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1656 if (p->fd < 0)
1657 return p->fd;
1658
1659 socket_apply_socket_options(s, p, p->fd);
1660 socket_symlink(s);
1661 break;
1662
1663 case SOCKET_SPECIAL:
1664
1665 p->fd = special_address_create(p->path, s->writable);
1666 if (p->fd < 0)
1667 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1668 break;
1669
1670 case SOCKET_FIFO:
1671
1672 p->fd = fifo_address_create(
1673 p->path,
1674 s->directory_mode,
1675 s->socket_mode);
1676 if (p->fd < 0)
1677 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1678
1679 socket_apply_fifo_options(s, p->fd);
1680 socket_symlink(s);
1681 break;
1682
1683 case SOCKET_MQUEUE:
1684
1685 p->fd = mq_address_create(
1686 p->path,
1687 s->socket_mode,
1688 s->mq_maxmsg,
1689 s->mq_msgsize);
1690 if (p->fd < 0)
1691 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1692 break;
1693
1694 case SOCKET_USB_FUNCTION: {
1695 _cleanup_free_ char *ep = NULL;
1696
1697 ep = path_make_absolute("ep0", p->path);
1698 if (!ep)
1699 return -ENOMEM;
1700
1701 p->fd = usbffs_address_create(ep);
1702 if (p->fd < 0)
1703 return p->fd;
1704
1705 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1706 if (r < 0)
1707 return r;
1708
1709 r = usbffs_dispatch_eps(p);
1710 if (r < 0)
1711 return r;
1712
1713 break;
1714 }
1715 default:
1716 assert_not_reached();
1717 }
1718 }
1719
1720 s = NULL;
1721 return 0;
1722 }
1723
1724 static void socket_unwatch_fds(Socket *s) {
1725 int r;
1726
1727 assert(s);
1728
1729 LIST_FOREACH(port, p, s->ports) {
1730 if (p->fd < 0)
1731 continue;
1732
1733 if (!p->event_source)
1734 continue;
1735
1736 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1737 if (r < 0)
1738 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1739 }
1740 }
1741
1742 static int socket_watch_fds(Socket *s) {
1743 int r;
1744
1745 assert(s);
1746
1747 LIST_FOREACH(port, p, s->ports) {
1748 if (p->fd < 0)
1749 continue;
1750
1751 if (p->event_source) {
1752 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1753 if (r < 0)
1754 goto fail;
1755 } else {
1756 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1757 if (r < 0)
1758 goto fail;
1759
1760 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1761 }
1762 }
1763
1764 return 0;
1765
1766 fail:
1767 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1768 socket_unwatch_fds(s);
1769 return r;
1770 }
1771
1772 enum {
1773 SOCKET_OPEN_NONE,
1774 SOCKET_OPEN_SOME,
1775 SOCKET_OPEN_ALL,
1776 };
1777
1778 static int socket_check_open(Socket *s) {
1779 bool have_open = false, have_closed = false;
1780
1781 assert(s);
1782
1783 LIST_FOREACH(port, p, s->ports) {
1784 if (p->fd < 0)
1785 have_closed = true;
1786 else
1787 have_open = true;
1788
1789 if (have_open && have_closed)
1790 return SOCKET_OPEN_SOME;
1791 }
1792
1793 if (have_open)
1794 return SOCKET_OPEN_ALL;
1795
1796 return SOCKET_OPEN_NONE;
1797 }
1798
1799 static void socket_set_state(Socket *s, SocketState state) {
1800 SocketState old_state;
1801 assert(s);
1802
1803 if (s->state != state)
1804 bus_unit_send_pending_change_signal(UNIT(s), false);
1805
1806 old_state = s->state;
1807 s->state = state;
1808
1809 if (!IN_SET(state,
1810 SOCKET_START_PRE,
1811 SOCKET_START_CHOWN,
1812 SOCKET_START_POST,
1813 SOCKET_STOP_PRE,
1814 SOCKET_STOP_PRE_SIGTERM,
1815 SOCKET_STOP_PRE_SIGKILL,
1816 SOCKET_STOP_POST,
1817 SOCKET_FINAL_SIGTERM,
1818 SOCKET_FINAL_SIGKILL,
1819 SOCKET_CLEANING)) {
1820
1821 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1822 socket_unwatch_control_pid(s);
1823 s->control_command = NULL;
1824 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1825 }
1826
1827 if (state != SOCKET_LISTENING)
1828 socket_unwatch_fds(s);
1829
1830 if (!IN_SET(state,
1831 SOCKET_START_CHOWN,
1832 SOCKET_START_POST,
1833 SOCKET_LISTENING,
1834 SOCKET_RUNNING,
1835 SOCKET_STOP_PRE,
1836 SOCKET_STOP_PRE_SIGTERM,
1837 SOCKET_STOP_PRE_SIGKILL,
1838 SOCKET_CLEANING))
1839 socket_close_fds(s);
1840
1841 if (state != old_state)
1842 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1843
1844 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1845 }
1846
1847 static int socket_coldplug(Unit *u) {
1848 Socket *s = SOCKET(u);
1849 int r;
1850
1851 assert(s);
1852 assert(s->state == SOCKET_DEAD);
1853
1854 if (s->deserialized_state == s->state)
1855 return 0;
1856
1857 if (s->control_pid > 0 &&
1858 pid_is_unwaited(s->control_pid) &&
1859 IN_SET(s->deserialized_state,
1860 SOCKET_START_PRE,
1861 SOCKET_START_CHOWN,
1862 SOCKET_START_POST,
1863 SOCKET_STOP_PRE,
1864 SOCKET_STOP_PRE_SIGTERM,
1865 SOCKET_STOP_PRE_SIGKILL,
1866 SOCKET_STOP_POST,
1867 SOCKET_FINAL_SIGTERM,
1868 SOCKET_FINAL_SIGKILL,
1869 SOCKET_CLEANING)) {
1870
1871 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1872 if (r < 0)
1873 return r;
1874
1875 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1876 if (r < 0)
1877 return r;
1878 }
1879
1880 if (IN_SET(s->deserialized_state,
1881 SOCKET_START_CHOWN,
1882 SOCKET_START_POST,
1883 SOCKET_LISTENING,
1884 SOCKET_RUNNING)) {
1885
1886 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1887 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1888 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1889 * and if there's a mismatch, warn loudly. */
1890
1891 r = socket_check_open(s);
1892 if (r == SOCKET_OPEN_NONE)
1893 log_unit_warning(UNIT(s),
1894 "Socket unit configuration has changed while unit has been running, "
1895 "no open socket file descriptor left. "
1896 "The socket unit is not functional until restarted.");
1897 else if (r == SOCKET_OPEN_SOME)
1898 log_unit_warning(UNIT(s),
1899 "Socket unit configuration has changed while unit has been running, "
1900 "and some socket file descriptors have not been opened yet. "
1901 "The socket unit is not fully functional until restarted.");
1902 }
1903
1904 if (s->deserialized_state == SOCKET_LISTENING) {
1905 r = socket_watch_fds(s);
1906 if (r < 0)
1907 return r;
1908 }
1909
1910 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1911 (void) unit_setup_exec_runtime(u);
1912
1913 socket_set_state(s, s->deserialized_state);
1914 return 0;
1915 }
1916
1917 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1918
1919 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1920 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1921 .stdin_fd = -EBADF,
1922 .stdout_fd = -EBADF,
1923 .stderr_fd = -EBADF,
1924 .exec_fd = -EBADF,
1925 };
1926 pid_t pid;
1927 int r;
1928
1929 assert(s);
1930 assert(c);
1931 assert(_pid);
1932
1933 r = unit_prepare_exec(UNIT(s));
1934 if (r < 0)
1935 return r;
1936
1937 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1938 if (r < 0)
1939 return r;
1940
1941 r = unit_set_exec_params(UNIT(s), &exec_params);
1942 if (r < 0)
1943 return r;
1944
1945 r = exec_spawn(UNIT(s),
1946 c,
1947 &s->exec_context,
1948 &exec_params,
1949 s->exec_runtime,
1950 &s->cgroup_context,
1951 &pid);
1952 if (r < 0)
1953 return r;
1954
1955 r = unit_watch_pid(UNIT(s), pid, true);
1956 if (r < 0)
1957 return r;
1958
1959 *_pid = pid;
1960
1961 return 0;
1962 }
1963
1964 static int socket_chown(Socket *s, pid_t *_pid) {
1965 pid_t pid;
1966 int r;
1967
1968 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1969 if (r < 0)
1970 goto fail;
1971
1972 /* We have to resolve the user names out-of-process, hence
1973 * let's fork here. It's messy, but well, what can we do? */
1974
1975 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1976 if (r < 0)
1977 return r;
1978 if (r == 0) {
1979 uid_t uid = UID_INVALID;
1980 gid_t gid = GID_INVALID;
1981
1982 /* Child */
1983
1984 if (!isempty(s->user)) {
1985 const char *user = s->user;
1986
1987 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1988 if (r < 0) {
1989 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1990 _exit(EXIT_USER);
1991 }
1992 }
1993
1994 if (!isempty(s->group)) {
1995 const char *group = s->group;
1996
1997 r = get_group_creds(&group, &gid, 0);
1998 if (r < 0) {
1999 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2000 _exit(EXIT_GROUP);
2001 }
2002 }
2003
2004 LIST_FOREACH(port, p, s->ports) {
2005 const char *path = NULL;
2006
2007 if (p->type == SOCKET_SOCKET)
2008 path = socket_address_get_path(&p->address);
2009 else if (p->type == SOCKET_FIFO)
2010 path = p->path;
2011
2012 if (!path)
2013 continue;
2014
2015 if (chown(path, uid, gid) < 0) {
2016 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2017 _exit(EXIT_CHOWN);
2018 }
2019 }
2020
2021 _exit(EXIT_SUCCESS);
2022 }
2023
2024 r = unit_watch_pid(UNIT(s), pid, true);
2025 if (r < 0)
2026 goto fail;
2027
2028 *_pid = pid;
2029 return 0;
2030
2031 fail:
2032 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
2033 return r;
2034 }
2035
2036 static void socket_enter_dead(Socket *s, SocketResult f) {
2037 assert(s);
2038
2039 if (s->result == SOCKET_SUCCESS)
2040 s->result = f;
2041
2042 if (s->result == SOCKET_SUCCESS)
2043 unit_log_success(UNIT(s));
2044 else
2045 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2046
2047 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2048
2049 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2050
2051 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2052
2053 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2054
2055 unit_unref_uid_gid(UNIT(s), true);
2056 }
2057
2058 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2059
2060 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2061 int r;
2062 assert(s);
2063
2064 if (s->result == SOCKET_SUCCESS)
2065 s->result = f;
2066
2067 socket_unwatch_control_pid(s);
2068 s->control_command_id = SOCKET_EXEC_STOP_POST;
2069 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2070
2071 if (s->control_command) {
2072 r = socket_spawn(s, s->control_command, &s->control_pid);
2073 if (r < 0)
2074 goto fail;
2075
2076 socket_set_state(s, SOCKET_STOP_POST);
2077 } else
2078 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2079
2080 return;
2081
2082 fail:
2083 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2084 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2085 }
2086
2087 static int state_to_kill_operation(Socket *s, SocketState state) {
2088 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2089 return KILL_RESTART;
2090
2091 if (state == SOCKET_FINAL_SIGTERM)
2092 return KILL_TERMINATE;
2093
2094 return KILL_KILL;
2095 }
2096
2097 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2098 int r;
2099
2100 assert(s);
2101
2102 if (s->result == SOCKET_SUCCESS)
2103 s->result = f;
2104
2105 r = unit_kill_context(
2106 UNIT(s),
2107 &s->kill_context,
2108 state_to_kill_operation(s, state),
2109 -1,
2110 s->control_pid,
2111 false);
2112 if (r < 0)
2113 goto fail;
2114
2115 if (r > 0) {
2116 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2117 if (r < 0)
2118 goto fail;
2119
2120 socket_set_state(s, state);
2121 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2122 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2123 else if (state == SOCKET_STOP_PRE_SIGKILL)
2124 socket_enter_stop_post(s, SOCKET_SUCCESS);
2125 else if (state == SOCKET_FINAL_SIGTERM)
2126 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2127 else
2128 socket_enter_dead(s, SOCKET_SUCCESS);
2129
2130 return;
2131
2132 fail:
2133 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2134
2135 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2136 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2137 else
2138 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2139 }
2140
2141 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2142 int r;
2143 assert(s);
2144
2145 if (s->result == SOCKET_SUCCESS)
2146 s->result = f;
2147
2148 socket_unwatch_control_pid(s);
2149 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2150 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2151
2152 if (s->control_command) {
2153 r = socket_spawn(s, s->control_command, &s->control_pid);
2154 if (r < 0)
2155 goto fail;
2156
2157 socket_set_state(s, SOCKET_STOP_PRE);
2158 } else
2159 socket_enter_stop_post(s, SOCKET_SUCCESS);
2160
2161 return;
2162
2163 fail:
2164 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2165 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2166 }
2167
2168 static void socket_enter_listening(Socket *s) {
2169 int r;
2170 assert(s);
2171
2172 if (!s->accept && s->flush_pending) {
2173 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2174 flush_ports(s);
2175 }
2176
2177 r = socket_watch_fds(s);
2178 if (r < 0) {
2179 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2180 goto fail;
2181 }
2182
2183 socket_set_state(s, SOCKET_LISTENING);
2184 return;
2185
2186 fail:
2187 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2188 }
2189
2190 static void socket_enter_start_post(Socket *s) {
2191 int r;
2192 assert(s);
2193
2194 socket_unwatch_control_pid(s);
2195 s->control_command_id = SOCKET_EXEC_START_POST;
2196 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2197
2198 if (s->control_command) {
2199 r = socket_spawn(s, s->control_command, &s->control_pid);
2200 if (r < 0) {
2201 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2202 goto fail;
2203 }
2204
2205 socket_set_state(s, SOCKET_START_POST);
2206 } else
2207 socket_enter_listening(s);
2208
2209 return;
2210
2211 fail:
2212 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2213 }
2214
2215 static void socket_enter_start_chown(Socket *s) {
2216 int r;
2217
2218 assert(s);
2219
2220 r = socket_open_fds(s);
2221 if (r < 0) {
2222 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2223 goto fail;
2224 }
2225
2226 if (!isempty(s->user) || !isempty(s->group)) {
2227
2228 socket_unwatch_control_pid(s);
2229 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2230 s->control_command = NULL;
2231
2232 r = socket_chown(s, &s->control_pid);
2233 if (r < 0) {
2234 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2235 goto fail;
2236 }
2237
2238 socket_set_state(s, SOCKET_START_CHOWN);
2239 } else
2240 socket_enter_start_post(s);
2241
2242 return;
2243
2244 fail:
2245 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2246 }
2247
2248 static void socket_enter_start_pre(Socket *s) {
2249 int r;
2250 assert(s);
2251
2252 socket_unwatch_control_pid(s);
2253
2254 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2255
2256 s->control_command_id = SOCKET_EXEC_START_PRE;
2257 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2258
2259 if (s->control_command) {
2260 r = socket_spawn(s, s->control_command, &s->control_pid);
2261 if (r < 0) {
2262 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2263 goto fail;
2264 }
2265
2266 socket_set_state(s, SOCKET_START_PRE);
2267 } else
2268 socket_enter_start_chown(s);
2269
2270 return;
2271
2272 fail:
2273 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2274 }
2275
2276 static void flush_ports(Socket *s) {
2277 assert(s);
2278
2279 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2280 * anymore */
2281
2282 LIST_FOREACH(port, p, s->ports) {
2283 if (p->fd < 0)
2284 continue;
2285
2286 (void) flush_accept(p->fd);
2287 (void) flush_fd(p->fd);
2288 }
2289 }
2290
2291 static void socket_enter_running(Socket *s, int cfd_in) {
2292 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2293 * somewhere or close it. */
2294 _cleanup_close_ int cfd = cfd_in;
2295
2296 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2297 int r;
2298
2299 assert(s);
2300
2301 /* We don't take connections anymore if we are supposed to shut down anyway */
2302 if (unit_stop_pending(UNIT(s))) {
2303
2304 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2305
2306 if (cfd >= 0)
2307 goto refuse;
2308
2309 flush_ports(s);
2310 return;
2311 }
2312
2313 if (!ratelimit_below(&s->trigger_limit)) {
2314 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2315 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2316 goto refuse;
2317 }
2318
2319 if (cfd < 0) {
2320 bool pending = false;
2321 Unit *other;
2322
2323 /* If there's already a start pending don't bother to do anything */
2324 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2325 if (unit_active_or_pending(other)) {
2326 pending = true;
2327 break;
2328 }
2329
2330 if (!pending) {
2331 if (!UNIT_ISSET(s->service)) {
2332 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2333 "Service to activate vanished, refusing activation.");
2334 goto fail;
2335 }
2336
2337 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2338 if (r < 0)
2339 goto fail;
2340 }
2341
2342 socket_set_state(s, SOCKET_RUNNING);
2343 } else {
2344 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2345 Unit *service;
2346
2347 if (s->n_connections >= s->max_connections) {
2348 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2349 s->n_connections);
2350 goto refuse;
2351 }
2352
2353 if (s->max_connections_per_source > 0) {
2354 r = socket_acquire_peer(s, cfd, &p);
2355 if (r < 0) {
2356 if (ERRNO_IS_DISCONNECT(r))
2357 return;
2358 /* We didn't have enough resources to acquire peer information, let's fail. */
2359 goto fail;
2360 }
2361 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2362 _cleanup_free_ char *t = NULL;
2363
2364 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2365
2366 log_unit_warning(UNIT(s),
2367 "Too many incoming connections (%u) from source %s, dropping connection.",
2368 p->n_ref, strnull(t));
2369 goto refuse;
2370 }
2371 }
2372
2373 r = socket_load_service_unit(s, cfd, &service);
2374 if (r < 0) {
2375 if (ERRNO_IS_DISCONNECT(r))
2376 return;
2377 goto fail;
2378 }
2379
2380 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2381 false, UNIT_DEPENDENCY_IMPLICIT);
2382 if (r < 0)
2383 goto fail;
2384
2385 s->n_accepted++;
2386
2387 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2388 if (r < 0) {
2389 if (ERRNO_IS_DISCONNECT(r))
2390 return;
2391 goto fail;
2392 }
2393
2394 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2395 s->n_connections++;
2396
2397 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2398 if (r < 0) {
2399 /* We failed to activate the new service, but it still exists. Let's make sure the
2400 * service closes and forgets the connection fd again, immediately. */
2401 service_release_socket_fd(SERVICE(service));
2402 goto fail;
2403 }
2404
2405 /* Notify clients about changed counters */
2406 unit_add_to_dbus_queue(UNIT(s));
2407 }
2408
2409 TAKE_FD(cfd);
2410 return;
2411
2412 refuse:
2413 s->n_refused++;
2414 return;
2415
2416 fail:
2417 if (ERRNO_IS_RESOURCE(r))
2418 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2419 bus_error_message(&error, r));
2420 else
2421 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2422 cfd >= 0 ? "template" : "non-template",
2423 bus_error_message(&error, r));
2424
2425 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2426 }
2427
2428 static void socket_run_next(Socket *s) {
2429 int r;
2430
2431 assert(s);
2432 assert(s->control_command);
2433 assert(s->control_command->command_next);
2434
2435 socket_unwatch_control_pid(s);
2436
2437 s->control_command = s->control_command->command_next;
2438
2439 r = socket_spawn(s, s->control_command, &s->control_pid);
2440 if (r < 0)
2441 goto fail;
2442
2443 return;
2444
2445 fail:
2446 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2447
2448 if (s->state == SOCKET_START_POST)
2449 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2450 else if (s->state == SOCKET_STOP_POST)
2451 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2452 else
2453 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2454 }
2455
2456 static int socket_start(Unit *u) {
2457 Socket *s = SOCKET(u);
2458 int r;
2459
2460 assert(s);
2461
2462 /* We cannot fulfill this request right now, try again later
2463 * please! */
2464 if (IN_SET(s->state,
2465 SOCKET_STOP_PRE,
2466 SOCKET_STOP_PRE_SIGKILL,
2467 SOCKET_STOP_PRE_SIGTERM,
2468 SOCKET_STOP_POST,
2469 SOCKET_FINAL_SIGTERM,
2470 SOCKET_FINAL_SIGKILL,
2471 SOCKET_CLEANING))
2472 return -EAGAIN;
2473
2474 /* Already on it! */
2475 if (IN_SET(s->state,
2476 SOCKET_START_PRE,
2477 SOCKET_START_CHOWN,
2478 SOCKET_START_POST))
2479 return 0;
2480
2481 /* Cannot run this without the service being around */
2482 if (UNIT_ISSET(s->service)) {
2483 Service *service;
2484
2485 service = SERVICE(UNIT_DEREF(s->service));
2486
2487 if (UNIT(service)->load_state != UNIT_LOADED)
2488 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT),
2489 "Socket service %s not loaded, refusing.", UNIT(service)->id);
2490
2491 /* If the service is already active we cannot start the
2492 * socket */
2493 if (!IN_SET(service->state,
2494 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
2495 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
2496 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY),
2497 "Socket service %s already active, refusing.", UNIT(service)->id);
2498 }
2499
2500 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2501
2502 r = unit_acquire_invocation_id(u);
2503 if (r < 0)
2504 return r;
2505
2506 s->result = SOCKET_SUCCESS;
2507 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2508
2509 u->reset_accounting = true;
2510
2511 socket_enter_start_pre(s);
2512 return 1;
2513 }
2514
2515 static int socket_stop(Unit *u) {
2516 Socket *s = SOCKET(u);
2517
2518 assert(s);
2519
2520 /* Already on it */
2521 if (IN_SET(s->state,
2522 SOCKET_STOP_PRE,
2523 SOCKET_STOP_PRE_SIGTERM,
2524 SOCKET_STOP_PRE_SIGKILL,
2525 SOCKET_STOP_POST,
2526 SOCKET_FINAL_SIGTERM,
2527 SOCKET_FINAL_SIGKILL))
2528 return 0;
2529
2530 /* If there's already something running we go directly into
2531 * kill mode. */
2532 if (IN_SET(s->state,
2533 SOCKET_START_PRE,
2534 SOCKET_START_CHOWN,
2535 SOCKET_START_POST)) {
2536 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2537 return -EAGAIN;
2538 }
2539
2540 /* If we are currently cleaning, then abort it, brutally. */
2541 if (s->state == SOCKET_CLEANING) {
2542 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2543 return 0;
2544 }
2545
2546 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2547
2548 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2549 return 1;
2550 }
2551
2552 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2553 Socket *s = SOCKET(u);
2554 int r;
2555
2556 assert(u);
2557 assert(f);
2558 assert(fds);
2559
2560 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2561 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2562 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2563 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2564
2565 if (s->control_pid > 0)
2566 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2567
2568 if (s->control_command_id >= 0)
2569 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2570
2571 LIST_FOREACH(port, p, s->ports) {
2572 int copy;
2573
2574 if (p->fd < 0)
2575 continue;
2576
2577 copy = fdset_put_dup(fds, p->fd);
2578 if (copy < 0)
2579 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2580
2581 if (p->type == SOCKET_SOCKET) {
2582 _cleanup_free_ char *t = NULL;
2583
2584 r = socket_address_print(&p->address, &t);
2585 if (r < 0)
2586 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2587
2588 if (socket_address_family(&p->address) == AF_NETLINK)
2589 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2590 else
2591 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2592 } else if (p->type == SOCKET_SPECIAL)
2593 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2594 else if (p->type == SOCKET_MQUEUE)
2595 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2596 else if (p->type == SOCKET_USB_FUNCTION)
2597 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2598 else {
2599 assert(p->type == SOCKET_FIFO);
2600 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2601 }
2602 }
2603
2604 return 0;
2605 }
2606
2607 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2608 Socket *s = SOCKET(u);
2609 int r;
2610
2611 assert(u);
2612 assert(key);
2613 assert(value);
2614
2615 if (streq(key, "state")) {
2616 SocketState state;
2617
2618 state = socket_state_from_string(value);
2619 if (state < 0)
2620 log_unit_debug(u, "Failed to parse state value: %s", value);
2621 else
2622 s->deserialized_state = state;
2623 } else if (streq(key, "result")) {
2624 SocketResult f;
2625
2626 f = socket_result_from_string(value);
2627 if (f < 0)
2628 log_unit_debug(u, "Failed to parse result value: %s", value);
2629 else if (f != SOCKET_SUCCESS)
2630 s->result = f;
2631
2632 } else if (streq(key, "n-accepted")) {
2633 unsigned k;
2634
2635 if (safe_atou(value, &k) < 0)
2636 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2637 else
2638 s->n_accepted += k;
2639 } else if (streq(key, "n-refused")) {
2640 unsigned k;
2641
2642 if (safe_atou(value, &k) < 0)
2643 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2644 else
2645 s->n_refused += k;
2646 } else if (streq(key, "control-pid")) {
2647 pid_t pid;
2648
2649 if (parse_pid(value, &pid) < 0)
2650 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2651 else
2652 s->control_pid = pid;
2653 } else if (streq(key, "control-command")) {
2654 SocketExecCommand id;
2655
2656 id = socket_exec_command_from_string(value);
2657 if (id < 0)
2658 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2659 else {
2660 s->control_command_id = id;
2661 s->control_command = s->exec_command[id];
2662 }
2663 } else if (streq(key, "fifo")) {
2664 _cleanup_free_ char *fdv = NULL;
2665 bool found = false;
2666 int fd;
2667
2668 r = extract_first_word(&value, &fdv, NULL, 0);
2669 if (r <= 0) {
2670 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2671 return 0;
2672 }
2673
2674 fd = parse_fd(fdv);
2675 if (fd < 0 || !fdset_contains(fds, fd)) {
2676 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2677 return 0;
2678 }
2679
2680 LIST_FOREACH(port, p, s->ports)
2681 if (p->fd < 0 &&
2682 p->type == SOCKET_FIFO &&
2683 path_equal_or_inode_same(p->path, value, 0)) {
2684 p->fd = fdset_remove(fds, fd);
2685 found = true;
2686 break;
2687 }
2688 if (!found)
2689 log_unit_debug(u, "No matching fifo socket found: %s", value);
2690
2691 } else if (streq(key, "special")) {
2692 _cleanup_free_ char *fdv = NULL;
2693 bool found = false;
2694 int fd;
2695
2696 r = extract_first_word(&value, &fdv, NULL, 0);
2697 if (r <= 0) {
2698 log_unit_debug(u, "Failed to parse special value: %s", value);
2699 return 0;
2700 }
2701
2702 fd = parse_fd(fdv);
2703 if (fd < 0 || !fdset_contains(fds, fd)) {
2704 log_unit_debug(u, "Invalid special value: %s", fdv);
2705 return 0;
2706 }
2707
2708 LIST_FOREACH(port, p, s->ports)
2709 if (p->fd < 0 &&
2710 p->type == SOCKET_SPECIAL &&
2711 path_equal_or_inode_same(p->path, value, 0)) {
2712 p->fd = fdset_remove(fds, fd);
2713 found = true;
2714 break;
2715 }
2716 if (!found)
2717 log_unit_debug(u, "No matching special socket found: %s", value);
2718
2719 } else if (streq(key, "mqueue")) {
2720 _cleanup_free_ char *fdv = NULL;
2721 bool found = false;
2722 int fd;
2723
2724 r = extract_first_word(&value, &fdv, NULL, 0);
2725 if (r <= 0) {
2726 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2727 return 0;
2728 }
2729
2730 fd = parse_fd(fdv);
2731 if (fd < 0 || !fdset_contains(fds, fd)) {
2732 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2733 return 0;
2734 }
2735
2736 LIST_FOREACH(port, p, s->ports)
2737 if (p->fd < 0 &&
2738 p->type == SOCKET_MQUEUE &&
2739 streq(p->path, value)) {
2740 p->fd = fdset_remove(fds, fd);
2741 found = true;
2742 break;
2743 }
2744 if (!found)
2745 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2746
2747 } else if (streq(key, "socket")) {
2748 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2749 bool found = false;
2750 int fd, type;
2751
2752 r = extract_first_word(&value, &fdv, NULL, 0);
2753 if (r <= 0) {
2754 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2755 return 0;
2756 }
2757
2758 fd = parse_fd(fdv);
2759 if (fd < 0 || !fdset_contains(fds, fd)) {
2760 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2761 return 0;
2762 }
2763
2764 r = extract_first_word(&value, &typev, NULL, 0);
2765 if (r <= 0) {
2766 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2767 return 0;
2768 }
2769
2770 if (safe_atoi(typev, &type) < 0 || type < 0) {
2771 log_unit_debug(u, "Invalid socket type: %s", typev);
2772 return 0;
2773 }
2774
2775 LIST_FOREACH(port, p, s->ports)
2776 if (p->fd < 0 &&
2777 socket_address_is(&p->address, value, type)) {
2778 p->fd = fdset_remove(fds, fd);
2779 found = true;
2780 break;
2781 }
2782 if (!found)
2783 log_unit_debug(u, "No matching %s socket found: %s",
2784 socket_address_type_to_string(type), value);
2785
2786 } else if (streq(key, "netlink")) {
2787 _cleanup_free_ char *fdv = NULL;
2788 bool found = false;
2789 int fd;
2790
2791 r = extract_first_word(&value, &fdv, NULL, 0);
2792 if (r <= 0) {
2793 log_unit_debug(u, "Failed to parse socket value: %s", value);
2794 return 0;
2795 }
2796
2797 fd = parse_fd(fdv);
2798 if (fd < 0 || !fdset_contains(fds, fd)) {
2799 log_unit_debug(u, "Invalid socket value: %s", fdv);
2800 return 0;
2801 }
2802
2803 LIST_FOREACH(port, p, s->ports)
2804 if (p->fd < 0 &&
2805 socket_address_is_netlink(&p->address, value)) {
2806 p->fd = fdset_remove(fds, fd);
2807 found = true;
2808 break;
2809 }
2810 if (!found)
2811 log_unit_debug(u, "No matching netlink socket found: %s", value);
2812
2813 } else if (streq(key, "ffs")) {
2814 _cleanup_free_ char *fdv = NULL;
2815 bool found = false;
2816 int fd;
2817
2818 r = extract_first_word(&value, &fdv, NULL, 0);
2819 if (r <= 0) {
2820 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2821 return 0;
2822 }
2823
2824 fd = parse_fd(fdv);
2825 if (fd < 0 || !fdset_contains(fds, fd)) {
2826 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2827 return 0;
2828 }
2829
2830 LIST_FOREACH(port, p, s->ports)
2831 if (p->fd < 0 &&
2832 p->type == SOCKET_USB_FUNCTION &&
2833 path_equal_or_inode_same(p->path, value, 0)) {
2834 p->fd = fdset_remove(fds, fd);
2835 found = true;
2836 break;
2837 }
2838 if (!found)
2839 log_unit_debug(u, "No matching ffs socket found: %s", value);
2840
2841 } else
2842 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2843
2844 return 0;
2845 }
2846
2847 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2848 Socket *s = SOCKET(u);
2849
2850 assert(u);
2851
2852 LIST_FOREACH(port, p, s->ports) {
2853 int fd;
2854
2855 if (p->type != SOCKET_SOCKET)
2856 continue;
2857
2858 if (p->fd >= 0)
2859 continue;
2860
2861 FDSET_FOREACH(fd, fds) {
2862 if (socket_address_matches_fd(&p->address, fd)) {
2863 p->fd = fdset_remove(fds, fd);
2864 s->deserialized_state = SOCKET_LISTENING;
2865 break;
2866 }
2867 }
2868 }
2869 }
2870
2871 static UnitActiveState socket_active_state(Unit *u) {
2872 assert(u);
2873
2874 return state_translation_table[SOCKET(u)->state];
2875 }
2876
2877 static const char *socket_sub_state_to_string(Unit *u) {
2878 assert(u);
2879
2880 return socket_state_to_string(SOCKET(u)->state);
2881 }
2882
2883 const char* socket_port_type_to_string(SocketPort *p) {
2884
2885 assert(p);
2886
2887 switch (p->type) {
2888
2889 case SOCKET_SOCKET:
2890
2891 switch (p->address.type) {
2892
2893 case SOCK_STREAM:
2894 return "Stream";
2895
2896 case SOCK_DGRAM:
2897 return "Datagram";
2898
2899 case SOCK_SEQPACKET:
2900 return "SequentialPacket";
2901
2902 case SOCK_RAW:
2903 if (socket_address_family(&p->address) == AF_NETLINK)
2904 return "Netlink";
2905
2906 _fallthrough_;
2907 default:
2908 return NULL;
2909 }
2910
2911 case SOCKET_SPECIAL:
2912 return "Special";
2913
2914 case SOCKET_MQUEUE:
2915 return "MessageQueue";
2916
2917 case SOCKET_FIFO:
2918 return "FIFO";
2919
2920 case SOCKET_USB_FUNCTION:
2921 return "USBFunction";
2922
2923 default:
2924 return NULL;
2925 }
2926 }
2927
2928 SocketType socket_port_type_from_string(const char *s) {
2929 assert(s);
2930
2931 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2932 return SOCKET_SOCKET;
2933 else if (streq(s, "Special"))
2934 return SOCKET_SPECIAL;
2935 else if (streq(s, "MessageQueue"))
2936 return SOCKET_MQUEUE;
2937 else if (streq(s, "FIFO"))
2938 return SOCKET_FIFO;
2939 else if (streq(s, "USBFunction"))
2940 return SOCKET_USB_FUNCTION;
2941 else
2942 return _SOCKET_TYPE_INVALID;
2943 }
2944
2945 static bool socket_may_gc(Unit *u) {
2946 Socket *s = SOCKET(u);
2947
2948 assert(u);
2949
2950 return s->n_connections == 0;
2951 }
2952
2953 static int socket_accept_do(Socket *s, int fd) {
2954 int cfd;
2955
2956 assert(s);
2957 assert(fd >= 0);
2958
2959 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2960 if (cfd < 0)
2961 /* Convert transient network errors into clean and well-defined EAGAIN */
2962 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2963
2964 return cfd;
2965 }
2966
2967 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2968 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2969 int cfd, r;
2970 pid_t pid;
2971
2972 assert(s);
2973 assert(p);
2974 assert(fd >= 0);
2975
2976 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2977 * connection socket is also properly associated with the cgroup. */
2978
2979 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2980 goto shortcut;
2981
2982 r = bpf_firewall_supported();
2983 if (r < 0)
2984 return r;
2985 if (r == BPF_FIREWALL_UNSUPPORTED)
2986 goto shortcut;
2987
2988 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2989 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2990
2991 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2992 if (r < 0)
2993 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2994 if (r == 0) {
2995 /* Child */
2996
2997 pair[0] = safe_close(pair[0]);
2998
2999 cfd = socket_accept_do(s, fd);
3000 if (cfd == -EAGAIN) /* spurious accept() */
3001 _exit(EXIT_SUCCESS);
3002 if (cfd < 0) {
3003 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3004 _exit(EXIT_FAILURE);
3005 }
3006
3007 r = send_one_fd(pair[1], cfd, 0);
3008 if (r < 0) {
3009 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3010 _exit(EXIT_FAILURE);
3011 }
3012
3013 _exit(EXIT_SUCCESS);
3014 }
3015
3016 pair[1] = safe_close(pair[1]);
3017 cfd = receive_one_fd(pair[0], 0);
3018
3019 /* We synchronously wait for the helper, as it shouldn't be slow */
3020 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
3021 if (r < 0) {
3022 safe_close(cfd);
3023 return r;
3024 }
3025
3026 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3027 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3028 if (cfd == -EIO)
3029 return -EAGAIN;
3030 if (cfd < 0)
3031 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3032
3033 return cfd;
3034
3035 shortcut:
3036 cfd = socket_accept_do(s, fd);
3037 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3038 return -EAGAIN;
3039 if (cfd < 0)
3040 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3041
3042 return cfd;
3043 }
3044
3045 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3046 SocketPort *p = ASSERT_PTR(userdata);
3047 int cfd = -EBADF;
3048
3049 assert(fd >= 0);
3050
3051 if (p->socket->state != SOCKET_LISTENING)
3052 return 0;
3053
3054 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3055
3056 if (revents != EPOLLIN) {
3057 if (revents & EPOLLHUP)
3058 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.");
3059 else
3060 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3061 goto fail;
3062 }
3063
3064 if (p->socket->accept &&
3065 p->type == SOCKET_SOCKET &&
3066 socket_address_can_accept(&p->address)) {
3067
3068 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3069 if (cfd == -EAGAIN) /* Spurious accept() */
3070 return 0;
3071 if (cfd < 0)
3072 goto fail;
3073
3074 socket_apply_socket_options(p->socket, p, cfd);
3075 }
3076
3077 socket_enter_running(p->socket, cfd);
3078 return 0;
3079
3080 fail:
3081 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3082 return 0;
3083 }
3084
3085 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3086 Socket *s = SOCKET(u);
3087 SocketResult f;
3088
3089 assert(s);
3090 assert(pid >= 0);
3091
3092 if (pid != s->control_pid)
3093 return;
3094
3095 s->control_pid = 0;
3096
3097 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3098 f = SOCKET_SUCCESS;
3099 else if (code == CLD_EXITED)
3100 f = SOCKET_FAILURE_EXIT_CODE;
3101 else if (code == CLD_KILLED)
3102 f = SOCKET_FAILURE_SIGNAL;
3103 else if (code == CLD_DUMPED)
3104 f = SOCKET_FAILURE_CORE_DUMP;
3105 else
3106 assert_not_reached();
3107
3108 if (s->control_command) {
3109 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3110
3111 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3112 f = SOCKET_SUCCESS;
3113 }
3114
3115 unit_log_process_exit(
3116 u,
3117 "Control process",
3118 socket_exec_command_to_string(s->control_command_id),
3119 f == SOCKET_SUCCESS,
3120 code, status);
3121
3122 if (s->result == SOCKET_SUCCESS)
3123 s->result = f;
3124
3125 if (s->control_command &&
3126 s->control_command->command_next &&
3127 f == SOCKET_SUCCESS) {
3128
3129 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3130 socket_run_next(s);
3131 } else {
3132 s->control_command = NULL;
3133 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3134
3135 /* No further commands for this step, so let's figure
3136 * out what to do next */
3137
3138 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3139
3140 switch (s->state) {
3141
3142 case SOCKET_START_PRE:
3143 if (f == SOCKET_SUCCESS)
3144 socket_enter_start_chown(s);
3145 else
3146 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3147 break;
3148
3149 case SOCKET_START_CHOWN:
3150 if (f == SOCKET_SUCCESS)
3151 socket_enter_start_post(s);
3152 else
3153 socket_enter_stop_pre(s, f);
3154 break;
3155
3156 case SOCKET_START_POST:
3157 if (f == SOCKET_SUCCESS)
3158 socket_enter_listening(s);
3159 else
3160 socket_enter_stop_pre(s, f);
3161 break;
3162
3163 case SOCKET_STOP_PRE:
3164 case SOCKET_STOP_PRE_SIGTERM:
3165 case SOCKET_STOP_PRE_SIGKILL:
3166 socket_enter_stop_post(s, f);
3167 break;
3168
3169 case SOCKET_STOP_POST:
3170 case SOCKET_FINAL_SIGTERM:
3171 case SOCKET_FINAL_SIGKILL:
3172 socket_enter_dead(s, f);
3173 break;
3174
3175 case SOCKET_CLEANING:
3176
3177 if (s->clean_result == SOCKET_SUCCESS)
3178 s->clean_result = f;
3179
3180 socket_enter_dead(s, SOCKET_SUCCESS);
3181 break;
3182
3183 default:
3184 assert_not_reached();
3185 }
3186 }
3187
3188 /* Notify clients about changed exit status */
3189 unit_add_to_dbus_queue(u);
3190 }
3191
3192 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3193 Socket *s = SOCKET(userdata);
3194
3195 assert(s);
3196 assert(s->timer_event_source == source);
3197
3198 switch (s->state) {
3199
3200 case SOCKET_START_PRE:
3201 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3202 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3203 break;
3204
3205 case SOCKET_START_CHOWN:
3206 case SOCKET_START_POST:
3207 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3208 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3209 break;
3210
3211 case SOCKET_STOP_PRE:
3212 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3213 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3214 break;
3215
3216 case SOCKET_STOP_PRE_SIGTERM:
3217 if (s->kill_context.send_sigkill) {
3218 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3219 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3220 } else {
3221 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3222 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3223 }
3224 break;
3225
3226 case SOCKET_STOP_PRE_SIGKILL:
3227 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3228 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3229 break;
3230
3231 case SOCKET_STOP_POST:
3232 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3233 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3234 break;
3235
3236 case SOCKET_FINAL_SIGTERM:
3237 if (s->kill_context.send_sigkill) {
3238 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3239 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3240 } else {
3241 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3242 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3243 }
3244 break;
3245
3246 case SOCKET_FINAL_SIGKILL:
3247 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3248 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3249 break;
3250
3251 case SOCKET_CLEANING:
3252 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3253
3254 if (s->clean_result == SOCKET_SUCCESS)
3255 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3256
3257 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3258 break;
3259
3260 default:
3261 assert_not_reached();
3262 }
3263
3264 return 0;
3265 }
3266
3267 int socket_collect_fds(Socket *s, int **fds) {
3268 size_t k = 0, n = 0;
3269 int *rfds;
3270
3271 assert(s);
3272 assert(fds);
3273
3274 /* Called from the service code for requesting our fds */
3275
3276 LIST_FOREACH(port, p, s->ports) {
3277 if (p->fd >= 0)
3278 n++;
3279 n += p->n_auxiliary_fds;
3280 }
3281
3282 if (n <= 0) {
3283 *fds = NULL;
3284 return 0;
3285 }
3286
3287 rfds = new(int, n);
3288 if (!rfds)
3289 return -ENOMEM;
3290
3291 LIST_FOREACH(port, p, s->ports) {
3292 if (p->fd >= 0)
3293 rfds[k++] = p->fd;
3294 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3295 rfds[k++] = p->auxiliary_fds[i];
3296 }
3297
3298 assert(k == n);
3299
3300 *fds = rfds;
3301 return (int) n;
3302 }
3303
3304 static void socket_reset_failed(Unit *u) {
3305 Socket *s = SOCKET(u);
3306
3307 assert(s);
3308
3309 if (s->state == SOCKET_FAILED)
3310 socket_set_state(s, SOCKET_DEAD);
3311
3312 s->result = SOCKET_SUCCESS;
3313 s->clean_result = SOCKET_SUCCESS;
3314 }
3315
3316 void socket_connection_unref(Socket *s) {
3317 assert(s);
3318
3319 /* The service is dead. Yay!
3320 *
3321 * This is strictly for one-instance-per-connection
3322 * services. */
3323
3324 assert(s->n_connections > 0);
3325 s->n_connections--;
3326
3327 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3328 }
3329
3330 static void socket_trigger_notify(Unit *u, Unit *other) {
3331 Socket *s = SOCKET(u);
3332
3333 assert(u);
3334 assert(other);
3335
3336 /* Filter out invocations with bogus state */
3337 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3338 assert(other->type == UNIT_SERVICE);
3339
3340 /* Don't propagate state changes from the service if we are already down */
3341 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3342 return;
3343
3344 /* We don't care for the service state if we are in Accept=yes mode */
3345 if (s->accept)
3346 return;
3347
3348 /* Propagate start limit hit state */
3349 if (other->start_limit_hit) {
3350 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3351 return;
3352 }
3353
3354 /* Don't propagate anything if there's still a job queued */
3355 if (other->job)
3356 return;
3357
3358 if (IN_SET(SERVICE(other)->state,
3359 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3360 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3361 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
3362 socket_enter_listening(s);
3363
3364 if (SERVICE(other)->state == SERVICE_RUNNING)
3365 socket_set_state(s, SOCKET_RUNNING);
3366 }
3367
3368 static int socket_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) {
3369 return unit_kill_common(u, who, signo, code, value, -1, SOCKET(u)->control_pid, error);
3370 }
3371
3372 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3373 Socket *s = SOCKET(u);
3374 usec_t t;
3375 int r;
3376
3377 if (!s->timer_event_source)
3378 return 0;
3379
3380 r = sd_event_source_get_time(s->timer_event_source, &t);
3381 if (r < 0)
3382 return r;
3383 if (t == USEC_INFINITY)
3384 return 0;
3385
3386 *timeout = t;
3387 return 1;
3388 }
3389
3390 char *socket_fdname(Socket *s) {
3391 assert(s);
3392
3393 /* Returns the name to use for $LISTEN_NAMES. If the user
3394 * didn't specify anything specifically, use the socket unit's
3395 * name as fallback. */
3396
3397 return s->fdname ?: UNIT(s)->id;
3398 }
3399
3400 static int socket_control_pid(Unit *u) {
3401 Socket *s = SOCKET(u);
3402
3403 assert(s);
3404
3405 return s->control_pid;
3406 }
3407
3408 static int socket_clean(Unit *u, ExecCleanMask mask) {
3409 _cleanup_strv_free_ char **l = NULL;
3410 Socket *s = SOCKET(u);
3411 int r;
3412
3413 assert(s);
3414 assert(mask != 0);
3415
3416 if (s->state != SOCKET_DEAD)
3417 return -EBUSY;
3418
3419 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3420 if (r < 0)
3421 return r;
3422
3423 if (strv_isempty(l))
3424 return -EUNATCH;
3425
3426 socket_unwatch_control_pid(s);
3427 s->clean_result = SOCKET_SUCCESS;
3428 s->control_command = NULL;
3429 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3430
3431 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3432 if (r < 0)
3433 goto fail;
3434
3435 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3436 if (r < 0)
3437 goto fail;
3438
3439 socket_set_state(s, SOCKET_CLEANING);
3440
3441 return 0;
3442
3443 fail:
3444 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3445 s->clean_result = SOCKET_FAILURE_RESOURCES;
3446 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3447 return r;
3448 }
3449
3450 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3451 Socket *s = SOCKET(u);
3452
3453 assert(s);
3454
3455 return exec_context_get_clean_mask(&s->exec_context, ret);
3456 }
3457
3458 static int socket_can_start(Unit *u) {
3459 Socket *s = SOCKET(u);
3460 int r;
3461
3462 assert(s);
3463
3464 r = unit_test_start_limit(u);
3465 if (r < 0) {
3466 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3467 return r;
3468 }
3469
3470 return 1;
3471 }
3472
3473 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3474 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3475 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3476 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3477 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3478 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3479 };
3480
3481 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3482
3483 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3484 [SOCKET_SUCCESS] = "success",
3485 [SOCKET_FAILURE_RESOURCES] = "resources",
3486 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3487 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3488 [SOCKET_FAILURE_SIGNAL] = "signal",
3489 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3490 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3491 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3492 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3493 };
3494
3495 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3496
3497 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3498 [SOCKET_TIMESTAMPING_OFF] = "off",
3499 [SOCKET_TIMESTAMPING_US] = "us",
3500 [SOCKET_TIMESTAMPING_NS] = "ns",
3501 };
3502
3503 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3504
3505 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3506 SocketTimestamping t;
3507 int r;
3508
3509 if (!p)
3510 return _SOCKET_TIMESTAMPING_INVALID;
3511
3512 t = socket_timestamping_from_string(p);
3513 if (t >= 0)
3514 return t;
3515
3516 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3517 * too. */
3518 if (streq(p, "nsec"))
3519 return SOCKET_TIMESTAMPING_NS;
3520 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3521 return SOCKET_TIMESTAMPING_US;
3522
3523 r = parse_boolean(p);
3524 if (r < 0)
3525 return _SOCKET_TIMESTAMPING_INVALID;
3526
3527 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3528 }
3529
3530 const UnitVTable socket_vtable = {
3531 .object_size = sizeof(Socket),
3532 .exec_context_offset = offsetof(Socket, exec_context),
3533 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3534 .kill_context_offset = offsetof(Socket, kill_context),
3535 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3536
3537 .sections =
3538 "Unit\0"
3539 "Socket\0"
3540 "Install\0",
3541 .private_section = "Socket",
3542
3543 .can_transient = true,
3544 .can_trigger = true,
3545 .can_fail = true,
3546
3547 .init = socket_init,
3548 .done = socket_done,
3549 .load = socket_load,
3550
3551 .coldplug = socket_coldplug,
3552
3553 .dump = socket_dump,
3554
3555 .start = socket_start,
3556 .stop = socket_stop,
3557
3558 .kill = socket_kill,
3559 .clean = socket_clean,
3560 .can_clean = socket_can_clean,
3561
3562 .get_timeout = socket_get_timeout,
3563
3564 .serialize = socket_serialize,
3565 .deserialize_item = socket_deserialize_item,
3566 .distribute_fds = socket_distribute_fds,
3567
3568 .active_state = socket_active_state,
3569 .sub_state_to_string = socket_sub_state_to_string,
3570
3571 .will_restart = unit_will_restart_default,
3572
3573 .may_gc = socket_may_gc,
3574
3575 .sigchld_event = socket_sigchld_event,
3576
3577 .trigger_notify = socket_trigger_notify,
3578
3579 .reset_failed = socket_reset_failed,
3580
3581 .control_pid = socket_control_pid,
3582
3583 .bus_set_property = bus_socket_set_property,
3584 .bus_commit_properties = bus_socket_commit_properties,
3585
3586 .status_message_formats = {
3587 .finished_start_job = {
3588 [JOB_DONE] = "Listening on %s.",
3589 [JOB_FAILED] = "Failed to listen on %s.",
3590 [JOB_TIMEOUT] = "Timed out starting %s.",
3591 },
3592 .finished_stop_job = {
3593 [JOB_DONE] = "Closed %s.",
3594 [JOB_FAILED] = "Failed stopping %s.",
3595 [JOB_TIMEOUT] = "Timed out stopping %s.",
3596 },
3597 },
3598
3599 .can_start = socket_can_start,
3600 };
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