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Merge pull request #10378 from poettering/json-fuzz-fix
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
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 <signal.h>
9 #include <sys/epoll.h>
10 #include <sys/stat.h>
11 #include <unistd.h>
12 #include <linux/sctp.h>
13
14 #include "alloc-util.h"
15 #include "bpf-firewall.h"
16 #include "bus-error.h"
17 #include "bus-util.h"
18 #include "copy.h"
19 #include "dbus-socket.h"
20 #include "def.h"
21 #include "exit-status.h"
22 #include "fd-util.h"
23 #include "format-util.h"
24 #include "fs-util.h"
25 #include "in-addr-util.h"
26 #include "io-util.h"
27 #include "label.h"
28 #include "log.h"
29 #include "missing.h"
30 #include "mkdir.h"
31 #include "parse-util.h"
32 #include "path-util.h"
33 #include "process-util.h"
34 #include "selinux-util.h"
35 #include "signal-util.h"
36 #include "smack-util.h"
37 #include "socket.h"
38 #include "socket-protocol-list.h"
39 #include "special.h"
40 #include "string-table.h"
41 #include "string-util.h"
42 #include "strv.h"
43 #include "unit-name.h"
44 #include "unit.h"
45 #include "user-util.h"
46
47 struct SocketPeer {
48 unsigned n_ref;
49
50 Socket *socket;
51 union sockaddr_union peer;
52 socklen_t peer_salen;
53 };
54
55 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
56 [SOCKET_DEAD] = UNIT_INACTIVE,
57 [SOCKET_START_PRE] = UNIT_ACTIVATING,
58 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
59 [SOCKET_START_POST] = UNIT_ACTIVATING,
60 [SOCKET_LISTENING] = UNIT_ACTIVE,
61 [SOCKET_RUNNING] = UNIT_ACTIVE,
62 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
63 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
64 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
65 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
66 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_FAILED] = UNIT_FAILED
69 };
70
71 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
72 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
73
74 static void socket_init(Unit *u) {
75 Socket *s = SOCKET(u);
76
77 assert(u);
78 assert(u->load_state == UNIT_STUB);
79
80 s->backlog = SOMAXCONN;
81 s->timeout_usec = u->manager->default_timeout_start_usec;
82 s->directory_mode = 0755;
83 s->socket_mode = 0666;
84
85 s->max_connections = 64;
86
87 s->priority = -1;
88 s->ip_tos = -1;
89 s->ip_ttl = -1;
90 s->mark = -1;
91
92 s->exec_context.std_output = u->manager->default_std_output;
93 s->exec_context.std_error = u->manager->default_std_error;
94
95 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
96
97 s->trigger_limit.interval = USEC_INFINITY;
98 s->trigger_limit.burst = (unsigned) -1;
99 }
100
101 static void socket_unwatch_control_pid(Socket *s) {
102 assert(s);
103
104 if (s->control_pid <= 0)
105 return;
106
107 unit_unwatch_pid(UNIT(s), s->control_pid);
108 s->control_pid = 0;
109 }
110
111 static void socket_cleanup_fd_list(SocketPort *p) {
112 assert(p);
113
114 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
115 p->auxiliary_fds = mfree(p->auxiliary_fds);
116 p->n_auxiliary_fds = 0;
117 }
118
119 void socket_free_ports(Socket *s) {
120 SocketPort *p;
121
122 assert(s);
123
124 while ((p = s->ports)) {
125 LIST_REMOVE(port, s->ports, p);
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 free(p);
133 }
134 }
135
136 static void socket_done(Unit *u) {
137 Socket *s = SOCKET(u);
138 SocketPeer *p;
139
140 assert(s);
141
142 socket_free_ports(s);
143
144 while ((p = set_steal_first(s->peers_by_address)))
145 p->socket = NULL;
146
147 s->peers_by_address = set_free(s->peers_by_address);
148
149 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
150 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
151 s->control_command = NULL;
152
153 dynamic_creds_unref(&s->dynamic_creds);
154
155 socket_unwatch_control_pid(s);
156
157 unit_ref_unset(&s->service);
158
159 s->tcp_congestion = mfree(s->tcp_congestion);
160 s->bind_to_device = mfree(s->bind_to_device);
161
162 s->smack = mfree(s->smack);
163 s->smack_ip_in = mfree(s->smack_ip_in);
164 s->smack_ip_out = mfree(s->smack_ip_out);
165
166 strv_free(s->symlinks);
167
168 s->user = mfree(s->user);
169 s->group = mfree(s->group);
170
171 s->fdname = mfree(s->fdname);
172
173 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
174 }
175
176 static int socket_arm_timer(Socket *s, usec_t usec) {
177 int r;
178
179 assert(s);
180
181 if (s->timer_event_source) {
182 r = sd_event_source_set_time(s->timer_event_source, usec);
183 if (r < 0)
184 return r;
185
186 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
187 }
188
189 if (usec == USEC_INFINITY)
190 return 0;
191
192 r = sd_event_add_time(
193 UNIT(s)->manager->event,
194 &s->timer_event_source,
195 CLOCK_MONOTONIC,
196 usec, 0,
197 socket_dispatch_timer, s);
198 if (r < 0)
199 return r;
200
201 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
202
203 return 0;
204 }
205
206 int socket_instantiate_service(Socket *s) {
207 _cleanup_free_ char *prefix = NULL, *name = NULL;
208 int r;
209 Unit *u;
210
211 assert(s);
212
213 /* This fills in s->service if it isn't filled in yet. For
214 * Accept=yes sockets we create the next connection service
215 * here. For Accept=no this is mostly a NOP since the service
216 * is figured out at load time anyway. */
217
218 if (UNIT_DEREF(s->service))
219 return 0;
220
221 if (!s->accept)
222 return 0;
223
224 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
225 if (r < 0)
226 return r;
227
228 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
229 return -ENOMEM;
230
231 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
232 if (r < 0)
233 return r;
234
235 unit_ref_set(&s->service, UNIT(s), u);
236
237 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
238 }
239
240 static bool have_non_accept_socket(Socket *s) {
241 SocketPort *p;
242
243 assert(s);
244
245 if (!s->accept)
246 return true;
247
248 LIST_FOREACH(port, p, s->ports) {
249
250 if (p->type != SOCKET_SOCKET)
251 return true;
252
253 if (!socket_address_can_accept(&p->address))
254 return true;
255 }
256
257 return false;
258 }
259
260 static int socket_add_mount_dependencies(Socket *s) {
261 SocketPort *p;
262 int r;
263
264 assert(s);
265
266 LIST_FOREACH(port, p, s->ports) {
267 const char *path = NULL;
268
269 if (p->type == SOCKET_SOCKET)
270 path = socket_address_get_path(&p->address);
271 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
272 path = p->path;
273
274 if (!path)
275 continue;
276
277 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
278 if (r < 0)
279 return r;
280 }
281
282 return 0;
283 }
284
285 static int socket_add_device_dependencies(Socket *s) {
286 char *t;
287
288 assert(s);
289
290 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
291 return 0;
292
293 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
294 return unit_add_node_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
295 }
296
297 static int socket_add_default_dependencies(Socket *s) {
298 int r;
299 assert(s);
300
301 if (!UNIT(s)->default_dependencies)
302 return 0;
303
304 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
305 if (r < 0)
306 return r;
307
308 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
309 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
310 if (r < 0)
311 return r;
312 }
313
314 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
315 }
316
317 _pure_ static bool socket_has_exec(Socket *s) {
318 unsigned i;
319 assert(s);
320
321 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
322 if (s->exec_command[i])
323 return true;
324
325 return false;
326 }
327
328 static int socket_add_extras(Socket *s) {
329 Unit *u = UNIT(s);
330 int r;
331
332 assert(s);
333
334 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
335 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
336 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
337 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
338 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
339 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
340 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
341 * service starts are typical. */
342
343 if (s->trigger_limit.interval == USEC_INFINITY)
344 s->trigger_limit.interval = 2 * USEC_PER_SEC;
345
346 if (s->trigger_limit.burst == (unsigned) -1) {
347 if (s->accept)
348 s->trigger_limit.burst = 200;
349 else
350 s->trigger_limit.burst = 20;
351 }
352
353 if (have_non_accept_socket(s)) {
354
355 if (!UNIT_DEREF(s->service)) {
356 Unit *x;
357
358 r = unit_load_related_unit(u, ".service", &x);
359 if (r < 0)
360 return r;
361
362 unit_ref_set(&s->service, u, x);
363 }
364
365 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
366 if (r < 0)
367 return r;
368 }
369
370 r = socket_add_mount_dependencies(s);
371 if (r < 0)
372 return r;
373
374 r = socket_add_device_dependencies(s);
375 if (r < 0)
376 return r;
377
378 r = unit_patch_contexts(u);
379 if (r < 0)
380 return r;
381
382 if (socket_has_exec(s)) {
383 r = unit_add_exec_dependencies(u, &s->exec_context);
384 if (r < 0)
385 return r;
386 }
387
388 r = unit_set_default_slice(u);
389 if (r < 0)
390 return r;
391
392 r = socket_add_default_dependencies(s);
393 if (r < 0)
394 return r;
395
396 return 0;
397 }
398
399 static const char *socket_find_symlink_target(Socket *s) {
400 const char *found = NULL;
401 SocketPort *p;
402
403 LIST_FOREACH(port, p, s->ports) {
404 const char *f = NULL;
405
406 switch (p->type) {
407
408 case SOCKET_FIFO:
409 f = p->path;
410 break;
411
412 case SOCKET_SOCKET:
413 f = socket_address_get_path(&p->address);
414 break;
415
416 default:
417 break;
418 }
419
420 if (f) {
421 if (found)
422 return NULL;
423
424 found = f;
425 }
426 }
427
428 return found;
429 }
430
431 static int socket_verify(Socket *s) {
432 assert(s);
433
434 if (UNIT(s)->load_state != UNIT_LOADED)
435 return 0;
436
437 if (!s->ports) {
438 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
439 return -ENOEXEC;
440 }
441
442 if (s->accept && have_non_accept_socket(s)) {
443 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
444 return -ENOEXEC;
445 }
446
447 if (s->accept && s->max_connections <= 0) {
448 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
449 return -ENOEXEC;
450 }
451
452 if (s->accept && UNIT_DEREF(s->service)) {
453 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
454 return -ENOEXEC;
455 }
456
457 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
458 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
459 return -ENOEXEC;
460 }
461
462 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
463 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
464 return -ENOEXEC;
465 }
466
467 return 0;
468 }
469
470 static void peer_address_hash_func(const void *p, struct siphash *state) {
471 const SocketPeer *s = p;
472
473 assert(s);
474
475 if (s->peer.sa.sa_family == AF_INET)
476 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
477 else if (s->peer.sa.sa_family == AF_INET6)
478 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
479 else if (s->peer.sa.sa_family == AF_VSOCK)
480 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
481 else
482 assert_not_reached("Unknown address family.");
483 }
484
485 static int peer_address_compare_func(const void *a, const void *b) {
486 const SocketPeer *x = a, *y = b;
487 int r;
488
489 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
490 if (r != 0)
491 return r;
492
493 switch(x->peer.sa.sa_family) {
494 case AF_INET:
495 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
496 case AF_INET6:
497 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
498 case AF_VSOCK:
499 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
500 }
501 assert_not_reached("Black sheep in the family!");
502 }
503
504 const struct hash_ops peer_address_hash_ops = {
505 .hash = peer_address_hash_func,
506 .compare = peer_address_compare_func
507 };
508
509 static int socket_load(Unit *u) {
510 Socket *s = SOCKET(u);
511 int r;
512
513 assert(u);
514 assert(u->load_state == UNIT_STUB);
515
516 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
517 if (r < 0)
518 return r;
519
520 r = unit_load_fragment_and_dropin(u);
521 if (r < 0)
522 return r;
523
524 if (u->load_state == UNIT_LOADED) {
525 /* This is a new unit? Then let's add in some extras */
526 r = socket_add_extras(s);
527 if (r < 0)
528 return r;
529 }
530
531 return socket_verify(s);
532 }
533
534 static SocketPeer *socket_peer_new(void) {
535 SocketPeer *p;
536
537 p = new0(SocketPeer, 1);
538 if (!p)
539 return NULL;
540
541 p->n_ref = 1;
542
543 return p;
544 }
545
546 static SocketPeer *socket_peer_free(SocketPeer *p) {
547 assert(p);
548
549 if (p->socket)
550 set_remove(p->socket->peers_by_address, p);
551
552 return mfree(p);
553 }
554
555 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
556
557 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
558 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
559 SocketPeer sa = {}, *i;
560 socklen_t salen = sizeof(sa.peer);
561 int r;
562
563 assert(fd >= 0);
564 assert(s);
565
566 r = getpeername(fd, &sa.peer.sa, &salen);
567 if (r < 0)
568 return log_error_errno(errno, "getpeername failed: %m");
569
570 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
571 *p = NULL;
572 return 0;
573 }
574
575 i = set_get(s->peers_by_address, &sa);
576 if (i) {
577 *p = socket_peer_ref(i);
578 return 1;
579 }
580
581 remote = socket_peer_new();
582 if (!remote)
583 return log_oom();
584
585 remote->peer = sa.peer;
586 remote->peer_salen = salen;
587
588 r = set_put(s->peers_by_address, remote);
589 if (r < 0)
590 return r;
591
592 remote->socket = s;
593
594 *p = TAKE_PTR(remote);
595
596 return 1;
597 }
598
599 _const_ static const char* listen_lookup(int family, int type) {
600
601 if (family == AF_NETLINK)
602 return "ListenNetlink";
603
604 if (type == SOCK_STREAM)
605 return "ListenStream";
606 else if (type == SOCK_DGRAM)
607 return "ListenDatagram";
608 else if (type == SOCK_SEQPACKET)
609 return "ListenSequentialPacket";
610
611 assert_not_reached("Unknown socket type");
612 return NULL;
613 }
614
615 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
616 char time_string[FORMAT_TIMESPAN_MAX];
617 SocketExecCommand c;
618 Socket *s = SOCKET(u);
619 SocketPort *p;
620 const char *prefix2, *str;
621
622 assert(s);
623 assert(f);
624
625 prefix = strempty(prefix);
626 prefix2 = strjoina(prefix, "\t");
627
628 fprintf(f,
629 "%sSocket State: %s\n"
630 "%sResult: %s\n"
631 "%sBindIPv6Only: %s\n"
632 "%sBacklog: %u\n"
633 "%sSocketMode: %04o\n"
634 "%sDirectoryMode: %04o\n"
635 "%sKeepAlive: %s\n"
636 "%sNoDelay: %s\n"
637 "%sFreeBind: %s\n"
638 "%sTransparent: %s\n"
639 "%sBroadcast: %s\n"
640 "%sPassCredentials: %s\n"
641 "%sPassSecurity: %s\n"
642 "%sTCPCongestion: %s\n"
643 "%sRemoveOnStop: %s\n"
644 "%sWritable: %s\n"
645 "%sFileDescriptorName: %s\n"
646 "%sSELinuxContextFromNet: %s\n",
647 prefix, socket_state_to_string(s->state),
648 prefix, socket_result_to_string(s->result),
649 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
650 prefix, s->backlog,
651 prefix, s->socket_mode,
652 prefix, s->directory_mode,
653 prefix, yes_no(s->keep_alive),
654 prefix, yes_no(s->no_delay),
655 prefix, yes_no(s->free_bind),
656 prefix, yes_no(s->transparent),
657 prefix, yes_no(s->broadcast),
658 prefix, yes_no(s->pass_cred),
659 prefix, yes_no(s->pass_sec),
660 prefix, strna(s->tcp_congestion),
661 prefix, yes_no(s->remove_on_stop),
662 prefix, yes_no(s->writable),
663 prefix, socket_fdname(s),
664 prefix, yes_no(s->selinux_context_from_net));
665
666 if (s->control_pid > 0)
667 fprintf(f,
668 "%sControl PID: "PID_FMT"\n",
669 prefix, s->control_pid);
670
671 if (s->bind_to_device)
672 fprintf(f,
673 "%sBindToDevice: %s\n",
674 prefix, s->bind_to_device);
675
676 if (s->accept)
677 fprintf(f,
678 "%sAccepted: %u\n"
679 "%sNConnections: %u\n"
680 "%sMaxConnections: %u\n"
681 "%sMaxConnectionsPerSource: %u\n",
682 prefix, s->n_accepted,
683 prefix, s->n_connections,
684 prefix, s->max_connections,
685 prefix, s->max_connections_per_source);
686
687 if (s->priority >= 0)
688 fprintf(f,
689 "%sPriority: %i\n",
690 prefix, s->priority);
691
692 if (s->receive_buffer > 0)
693 fprintf(f,
694 "%sReceiveBuffer: %zu\n",
695 prefix, s->receive_buffer);
696
697 if (s->send_buffer > 0)
698 fprintf(f,
699 "%sSendBuffer: %zu\n",
700 prefix, s->send_buffer);
701
702 if (s->ip_tos >= 0)
703 fprintf(f,
704 "%sIPTOS: %i\n",
705 prefix, s->ip_tos);
706
707 if (s->ip_ttl >= 0)
708 fprintf(f,
709 "%sIPTTL: %i\n",
710 prefix, s->ip_ttl);
711
712 if (s->pipe_size > 0)
713 fprintf(f,
714 "%sPipeSize: %zu\n",
715 prefix, s->pipe_size);
716
717 if (s->mark >= 0)
718 fprintf(f,
719 "%sMark: %i\n",
720 prefix, s->mark);
721
722 if (s->mq_maxmsg > 0)
723 fprintf(f,
724 "%sMessageQueueMaxMessages: %li\n",
725 prefix, s->mq_maxmsg);
726
727 if (s->mq_msgsize > 0)
728 fprintf(f,
729 "%sMessageQueueMessageSize: %li\n",
730 prefix, s->mq_msgsize);
731
732 if (s->reuse_port)
733 fprintf(f,
734 "%sReusePort: %s\n",
735 prefix, yes_no(s->reuse_port));
736
737 if (s->smack)
738 fprintf(f,
739 "%sSmackLabel: %s\n",
740 prefix, s->smack);
741
742 if (s->smack_ip_in)
743 fprintf(f,
744 "%sSmackLabelIPIn: %s\n",
745 prefix, s->smack_ip_in);
746
747 if (s->smack_ip_out)
748 fprintf(f,
749 "%sSmackLabelIPOut: %s\n",
750 prefix, s->smack_ip_out);
751
752 if (!isempty(s->user) || !isempty(s->group))
753 fprintf(f,
754 "%sSocketUser: %s\n"
755 "%sSocketGroup: %s\n",
756 prefix, strna(s->user),
757 prefix, strna(s->group));
758
759 if (s->keep_alive_time > 0)
760 fprintf(f,
761 "%sKeepAliveTimeSec: %s\n",
762 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
763
764 if (s->keep_alive_interval > 0)
765 fprintf(f,
766 "%sKeepAliveIntervalSec: %s\n",
767 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
768
769 if (s->keep_alive_cnt > 0)
770 fprintf(f,
771 "%sKeepAliveProbes: %u\n",
772 prefix, s->keep_alive_cnt);
773
774 if (s->defer_accept > 0)
775 fprintf(f,
776 "%sDeferAcceptSec: %s\n",
777 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
778
779 LIST_FOREACH(port, p, s->ports) {
780
781 switch (p->type) {
782 case SOCKET_SOCKET: {
783 _cleanup_free_ char *k = NULL;
784 const char *t;
785 int r;
786
787 r = socket_address_print(&p->address, &k);
788 if (r < 0)
789 t = strerror(-r);
790 else
791 t = k;
792
793 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
794 break;
795 }
796 case SOCKET_SPECIAL:
797 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
798 break;
799 case SOCKET_USB_FUNCTION:
800 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
801 break;
802 case SOCKET_MQUEUE:
803 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
804 break;
805 default:
806 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
807 }
808 }
809
810 fprintf(f,
811 "%sTriggerLimitIntervalSec: %s\n"
812 "%sTriggerLimitBurst: %u\n",
813 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
814 prefix, s->trigger_limit.burst);
815
816 str = socket_protocol_to_name(s->socket_protocol);
817 if (str)
818 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
819
820 if (!strv_isempty(s->symlinks)) {
821 char **q;
822
823 fprintf(f, "%sSymlinks:", prefix);
824 STRV_FOREACH(q, s->symlinks)
825 fprintf(f, " %s", *q);
826
827 fprintf(f, "\n");
828 }
829
830 fprintf(f,
831 "%sTimeoutSec: %s\n",
832 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
833
834 exec_context_dump(&s->exec_context, f, prefix);
835 kill_context_dump(&s->kill_context, f, prefix);
836
837 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
838 if (!s->exec_command[c])
839 continue;
840
841 fprintf(f, "%s-> %s:\n",
842 prefix, socket_exec_command_to_string(c));
843
844 exec_command_dump_list(s->exec_command[c], f, prefix2);
845 }
846
847 cgroup_context_dump(&s->cgroup_context, f, prefix);
848 }
849
850 static int instance_from_socket(int fd, unsigned nr, char **instance) {
851 socklen_t l;
852 char *r;
853 union sockaddr_union local, remote;
854
855 assert(fd >= 0);
856 assert(instance);
857
858 l = sizeof(local);
859 if (getsockname(fd, &local.sa, &l) < 0)
860 return -errno;
861
862 l = sizeof(remote);
863 if (getpeername(fd, &remote.sa, &l) < 0)
864 return -errno;
865
866 switch (local.sa.sa_family) {
867
868 case AF_INET: {
869 uint32_t
870 a = be32toh(local.in.sin_addr.s_addr),
871 b = be32toh(remote.in.sin_addr.s_addr);
872
873 if (asprintf(&r,
874 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
875 nr,
876 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
877 be16toh(local.in.sin_port),
878 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
879 be16toh(remote.in.sin_port)) < 0)
880 return -ENOMEM;
881
882 break;
883 }
884
885 case AF_INET6: {
886 static const unsigned char ipv4_prefix[] = {
887 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
888 };
889
890 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
891 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
892 const uint8_t
893 *a = local.in6.sin6_addr.s6_addr+12,
894 *b = remote.in6.sin6_addr.s6_addr+12;
895
896 if (asprintf(&r,
897 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
898 nr,
899 a[0], a[1], a[2], a[3],
900 be16toh(local.in6.sin6_port),
901 b[0], b[1], b[2], b[3],
902 be16toh(remote.in6.sin6_port)) < 0)
903 return -ENOMEM;
904 } else {
905 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
906
907 if (asprintf(&r,
908 "%u-%s:%u-%s:%u",
909 nr,
910 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
911 be16toh(local.in6.sin6_port),
912 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
913 be16toh(remote.in6.sin6_port)) < 0)
914 return -ENOMEM;
915 }
916
917 break;
918 }
919
920 case AF_UNIX: {
921 struct ucred ucred;
922 int k;
923
924 k = getpeercred(fd, &ucred);
925 if (k >= 0) {
926 if (asprintf(&r,
927 "%u-"PID_FMT"-"UID_FMT,
928 nr, ucred.pid, ucred.uid) < 0)
929 return -ENOMEM;
930 } else if (k == -ENODATA) {
931 /* This handles the case where somebody is
932 * connecting from another pid/uid namespace
933 * (e.g. from outside of our container). */
934 if (asprintf(&r,
935 "%u-unknown",
936 nr) < 0)
937 return -ENOMEM;
938 } else
939 return k;
940
941 break;
942 }
943
944 case AF_VSOCK:
945 if (asprintf(&r,
946 "%u-%u:%u-%u:%u",
947 nr,
948 local.vm.svm_cid, local.vm.svm_port,
949 remote.vm.svm_cid, remote.vm.svm_port) < 0)
950 return -ENOMEM;
951
952 break;
953
954 default:
955 assert_not_reached("Unhandled socket type.");
956 }
957
958 *instance = r;
959 return 0;
960 }
961
962 static void socket_close_fds(Socket *s) {
963 SocketPort *p;
964 char **i;
965
966 assert(s);
967
968 LIST_FOREACH(port, p, s->ports) {
969 bool was_open;
970
971 was_open = p->fd >= 0;
972
973 p->event_source = sd_event_source_unref(p->event_source);
974 p->fd = safe_close(p->fd);
975 socket_cleanup_fd_list(p);
976
977 /* One little note: we should normally not delete any sockets in the file system here! After all some
978 * other process we spawned might still have a reference of this fd and wants to continue to use
979 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
980 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
981 * anyway, but only then. */
982
983 if (!was_open || !s->remove_on_stop)
984 continue;
985
986 switch (p->type) {
987
988 case SOCKET_FIFO:
989 (void) unlink(p->path);
990 break;
991
992 case SOCKET_MQUEUE:
993 (void) mq_unlink(p->path);
994 break;
995
996 case SOCKET_SOCKET:
997 (void) socket_address_unlink(&p->address);
998 break;
999
1000 default:
1001 break;
1002 }
1003 }
1004
1005 if (s->remove_on_stop)
1006 STRV_FOREACH(i, s->symlinks)
1007 (void) unlink(*i);
1008 }
1009
1010 static void socket_apply_socket_options(Socket *s, int fd) {
1011 int r;
1012
1013 assert(s);
1014 assert(fd >= 0);
1015
1016 if (s->keep_alive) {
1017 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
1018 if (r < 0)
1019 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
1020 }
1021
1022 if (s->keep_alive_time > 0) {
1023 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
1024 if (r < 0)
1025 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
1026 }
1027
1028 if (s->keep_alive_interval > 0) {
1029 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
1030 if (r < 0)
1031 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
1032 }
1033
1034 if (s->keep_alive_cnt > 0) {
1035 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1036 if (r < 0)
1037 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1038 }
1039
1040 if (s->defer_accept > 0) {
1041 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1042 if (r < 0)
1043 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1044 }
1045
1046 if (s->no_delay) {
1047 if (s->socket_protocol == IPPROTO_SCTP) {
1048 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1049 if (r < 0)
1050 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1051 } else {
1052 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1053 if (r < 0)
1054 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1055 }
1056 }
1057
1058 if (s->broadcast) {
1059 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1060 if (r < 0)
1061 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1062 }
1063
1064 if (s->pass_cred) {
1065 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1066 if (r < 0)
1067 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1068 }
1069
1070 if (s->pass_sec) {
1071 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1072 if (r < 0)
1073 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1074 }
1075
1076 if (s->priority >= 0) {
1077 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1078 if (r < 0)
1079 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1080 }
1081
1082 if (s->receive_buffer > 0) {
1083 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1084 if (setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, s->receive_buffer) < 0) {
1085 r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, s->receive_buffer);
1086 if (r < 0)
1087 log_unit_warning_errno(UNIT(s), r, "SO_RCVBUF failed: %m");
1088 }
1089 }
1090
1091 if (s->send_buffer > 0) {
1092 if (setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, s->send_buffer) < 0) {
1093 r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, s->send_buffer);
1094 if (r < 0)
1095 log_unit_warning_errno(UNIT(s), r, "SO_SNDBUF failed: %m");
1096 }
1097 }
1098
1099 if (s->mark >= 0) {
1100 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1101 if (r < 0)
1102 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1103 }
1104
1105 if (s->ip_tos >= 0) {
1106 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1107 if (r < 0)
1108 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1109 }
1110
1111 if (s->ip_ttl >= 0) {
1112 int x;
1113
1114 r = setsockopt_int(fd, IPPROTO_IP, IP_TTL, s->ip_ttl);
1115
1116 if (socket_ipv6_is_supported())
1117 x = setsockopt_int(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, s->ip_ttl);
1118 else
1119 x = -EAFNOSUPPORT;
1120
1121 if (r < 0 && x < 0)
1122 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1123 }
1124
1125 if (s->tcp_congestion)
1126 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1127 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1128
1129 if (s->smack_ip_in) {
1130 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1131 if (r < 0)
1132 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1133 }
1134
1135 if (s->smack_ip_out) {
1136 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1137 if (r < 0)
1138 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1139 }
1140 }
1141
1142 static void socket_apply_fifo_options(Socket *s, int fd) {
1143 int r;
1144
1145 assert(s);
1146 assert(fd >= 0);
1147
1148 if (s->pipe_size > 0)
1149 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1150 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1151
1152 if (s->smack) {
1153 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1154 if (r < 0)
1155 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1156 }
1157 }
1158
1159 static int fifo_address_create(
1160 const char *path,
1161 mode_t directory_mode,
1162 mode_t socket_mode) {
1163
1164 _cleanup_close_ int fd = -1;
1165 mode_t old_mask;
1166 struct stat st;
1167 int r;
1168
1169 assert(path);
1170
1171 (void) mkdir_parents_label(path, directory_mode);
1172
1173 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1174 if (r < 0)
1175 return r;
1176
1177 /* Enforce the right access mode for the fifo */
1178 old_mask = umask(~socket_mode);
1179
1180 /* Include the original umask in our mask */
1181 (void) umask(~socket_mode | old_mask);
1182
1183 r = mkfifo(path, socket_mode);
1184 (void) umask(old_mask);
1185
1186 if (r < 0 && errno != EEXIST) {
1187 r = -errno;
1188 goto fail;
1189 }
1190
1191 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1192 if (fd < 0) {
1193 r = -errno;
1194 goto fail;
1195 }
1196
1197 mac_selinux_create_file_clear();
1198
1199 if (fstat(fd, &st) < 0) {
1200 r = -errno;
1201 goto fail;
1202 }
1203
1204 if (!S_ISFIFO(st.st_mode) ||
1205 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1206 st.st_uid != getuid() ||
1207 st.st_gid != getgid()) {
1208 r = -EEXIST;
1209 goto fail;
1210 }
1211
1212 return TAKE_FD(fd);
1213
1214 fail:
1215 mac_selinux_create_file_clear();
1216 return r;
1217 }
1218
1219 static int special_address_create(const char *path, bool writable) {
1220 _cleanup_close_ int fd = -1;
1221 struct stat st;
1222
1223 assert(path);
1224
1225 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1226 if (fd < 0)
1227 return -errno;
1228
1229 if (fstat(fd, &st) < 0)
1230 return -errno;
1231
1232 /* Check whether this is a /proc, /sys or /dev file or char device */
1233 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1234 return -EEXIST;
1235
1236 return TAKE_FD(fd);
1237 }
1238
1239 static int usbffs_address_create(const char *path) {
1240 _cleanup_close_ int fd = -1;
1241 struct stat st;
1242
1243 assert(path);
1244
1245 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1246 if (fd < 0)
1247 return -errno;
1248
1249 if (fstat(fd, &st) < 0)
1250 return -errno;
1251
1252 /* Check whether this is a regular file (ffs endpoint) */
1253 if (!S_ISREG(st.st_mode))
1254 return -EEXIST;
1255
1256 return TAKE_FD(fd);
1257 }
1258
1259 static int mq_address_create(
1260 const char *path,
1261 mode_t mq_mode,
1262 long maxmsg,
1263 long msgsize) {
1264
1265 _cleanup_close_ int fd = -1;
1266 struct stat st;
1267 mode_t old_mask;
1268 struct mq_attr _attr, *attr = NULL;
1269
1270 assert(path);
1271
1272 if (maxmsg > 0 && msgsize > 0) {
1273 _attr = (struct mq_attr) {
1274 .mq_flags = O_NONBLOCK,
1275 .mq_maxmsg = maxmsg,
1276 .mq_msgsize = msgsize,
1277 };
1278 attr = &_attr;
1279 }
1280
1281 /* Enforce the right access mode for the mq */
1282 old_mask = umask(~mq_mode);
1283
1284 /* Include the original umask in our mask */
1285 (void) umask(~mq_mode | old_mask);
1286 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1287 (void) umask(old_mask);
1288
1289 if (fd < 0)
1290 return -errno;
1291
1292 if (fstat(fd, &st) < 0)
1293 return -errno;
1294
1295 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1296 st.st_uid != getuid() ||
1297 st.st_gid != getgid())
1298 return -EEXIST;
1299
1300 return TAKE_FD(fd);
1301 }
1302
1303 static int socket_symlink(Socket *s) {
1304 const char *p;
1305 char **i;
1306 int r;
1307
1308 assert(s);
1309
1310 p = socket_find_symlink_target(s);
1311 if (!p)
1312 return 0;
1313
1314 STRV_FOREACH(i, s->symlinks) {
1315 (void) mkdir_parents_label(*i, s->directory_mode);
1316
1317 r = symlink_idempotent(p, *i, false);
1318
1319 if (r == -EEXIST && s->remove_on_stop) {
1320 /* If there's already something where we want to create the symlink, and the destructive
1321 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1322 * again. */
1323
1324 if (unlink(*i) >= 0)
1325 r = symlink_idempotent(p, *i, false);
1326 }
1327
1328 if (r < 0)
1329 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1330 }
1331
1332 return 0;
1333 }
1334
1335 static int usbffs_write_descs(int fd, Service *s) {
1336 int r;
1337
1338 if (!s->usb_function_descriptors || !s->usb_function_strings)
1339 return -EINVAL;
1340
1341 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1342 if (r < 0)
1343 return r;
1344
1345 return copy_file_fd(s->usb_function_strings, fd, 0);
1346 }
1347
1348 static int usbffs_select_ep(const struct dirent *d) {
1349 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1350 }
1351
1352 static int usbffs_dispatch_eps(SocketPort *p) {
1353 _cleanup_free_ struct dirent **ent = NULL;
1354 size_t n, k, i;
1355 int r;
1356
1357 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1358 if (r < 0)
1359 return -errno;
1360
1361 n = (size_t) r;
1362 p->auxiliary_fds = new(int, n);
1363 if (!p->auxiliary_fds) {
1364 r = -ENOMEM;
1365 goto clear;
1366 }
1367
1368 p->n_auxiliary_fds = n;
1369
1370 k = 0;
1371 for (i = 0; i < n; ++i) {
1372 _cleanup_free_ char *ep = NULL;
1373
1374 ep = path_make_absolute(ent[i]->d_name, p->path);
1375 if (!ep) {
1376 r = -ENOMEM;
1377 goto fail;
1378 }
1379
1380 path_simplify(ep, false);
1381
1382 r = usbffs_address_create(ep);
1383 if (r < 0)
1384 goto fail;
1385
1386 p->auxiliary_fds[k++] = r;
1387 }
1388
1389 r = 0;
1390 goto clear;
1391
1392 fail:
1393 close_many(p->auxiliary_fds, k);
1394 p->auxiliary_fds = mfree(p->auxiliary_fds);
1395 p->n_auxiliary_fds = 0;
1396
1397 clear:
1398 for (i = 0; i < n; ++i)
1399 free(ent[i]);
1400
1401 return r;
1402 }
1403
1404 static int socket_determine_selinux_label(Socket *s, char **ret) {
1405 Service *service;
1406 ExecCommand *c;
1407 _cleanup_free_ char *path = NULL;
1408 int r;
1409
1410 assert(s);
1411 assert(ret);
1412
1413 if (s->selinux_context_from_net) {
1414 /* If this is requested, get label from the network label */
1415
1416 r = mac_selinux_get_our_label(ret);
1417 if (r == -EOPNOTSUPP)
1418 goto no_label;
1419
1420 } else {
1421 /* Otherwise, get it from the executable we are about to start */
1422 r = socket_instantiate_service(s);
1423 if (r < 0)
1424 return r;
1425
1426 if (!UNIT_ISSET(s->service))
1427 goto no_label;
1428
1429 service = SERVICE(UNIT_DEREF(s->service));
1430 c = service->exec_command[SERVICE_EXEC_START];
1431 if (!c)
1432 goto no_label;
1433
1434 r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
1435 if (r < 0)
1436 goto no_label;
1437
1438 r = mac_selinux_get_create_label_from_exe(path, ret);
1439 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1440 goto no_label;
1441 }
1442
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 static int socket_address_listen_in_cgroup(
1473 Socket *s,
1474 const SocketAddress *address,
1475 const char *label) {
1476
1477 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1478 int fd, r;
1479 pid_t pid;
1480
1481 assert(s);
1482 assert(address);
1483
1484 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1485 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1486 * unit's cgroup for the purpose of BPF filtering and such. */
1487
1488 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1489 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1490
1491 r = bpf_firewall_supported();
1492 if (r < 0)
1493 return r;
1494 if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1495 goto shortcut;
1496
1497 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1498 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1499
1500 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1501 if (r < 0)
1502 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1503 if (r == 0) {
1504 /* Child */
1505
1506 pair[0] = safe_close(pair[0]);
1507
1508 fd = socket_address_listen_do(s, address, label);
1509 if (fd < 0) {
1510 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1511 _exit(EXIT_FAILURE);
1512 }
1513
1514 r = send_one_fd(pair[1], fd, 0);
1515 if (r < 0) {
1516 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1517 _exit(EXIT_FAILURE);
1518 }
1519
1520 _exit(EXIT_SUCCESS);
1521 }
1522
1523 pair[1] = safe_close(pair[1]);
1524 fd = receive_one_fd(pair[0], 0);
1525
1526 /* We synchronously wait for the helper, as it shouldn't be slow */
1527 r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
1528 if (r < 0) {
1529 safe_close(fd);
1530 return r;
1531 }
1532
1533 if (fd < 0)
1534 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1535
1536 return fd;
1537
1538 shortcut:
1539 fd = socket_address_listen_do(s, address, label);
1540 if (fd < 0)
1541 return log_error_errno(fd, "Failed to create listening socket: %m");
1542
1543 return fd;
1544 }
1545
1546 static int socket_open_fds(Socket *s) {
1547 _cleanup_(mac_selinux_freep) char *label = NULL;
1548 bool know_label = false;
1549 SocketPort *p;
1550 int r;
1551
1552 assert(s);
1553
1554 LIST_FOREACH(port, p, s->ports) {
1555
1556 if (p->fd >= 0)
1557 continue;
1558
1559 switch (p->type) {
1560
1561 case SOCKET_SOCKET:
1562
1563 if (!know_label) {
1564 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1565 * we need this and remember it for the rest. */
1566
1567 r = socket_determine_selinux_label(s, &label);
1568 if (r < 0)
1569 goto rollback;
1570
1571 know_label = true;
1572 }
1573
1574 /* Apply the socket protocol */
1575 switch (p->address.type) {
1576
1577 case SOCK_STREAM:
1578 case SOCK_SEQPACKET:
1579 if (s->socket_protocol == IPPROTO_SCTP)
1580 p->address.protocol = s->socket_protocol;
1581 break;
1582
1583 case SOCK_DGRAM:
1584 if (s->socket_protocol == IPPROTO_UDPLITE)
1585 p->address.protocol = s->socket_protocol;
1586 break;
1587 }
1588
1589 r = socket_address_listen_in_cgroup(s, &p->address, label);
1590 if (r < 0)
1591 goto rollback;
1592
1593 p->fd = r;
1594 socket_apply_socket_options(s, p->fd);
1595 socket_symlink(s);
1596 break;
1597
1598 case SOCKET_SPECIAL:
1599
1600 p->fd = special_address_create(p->path, s->writable);
1601 if (p->fd < 0) {
1602 r = p->fd;
1603 goto rollback;
1604 }
1605 break;
1606
1607 case SOCKET_FIFO:
1608
1609 p->fd = fifo_address_create(
1610 p->path,
1611 s->directory_mode,
1612 s->socket_mode);
1613 if (p->fd < 0) {
1614 r = p->fd;
1615 goto rollback;
1616 }
1617
1618 socket_apply_fifo_options(s, p->fd);
1619 socket_symlink(s);
1620 break;
1621
1622 case SOCKET_MQUEUE:
1623
1624 p->fd = mq_address_create(
1625 p->path,
1626 s->socket_mode,
1627 s->mq_maxmsg,
1628 s->mq_msgsize);
1629 if (p->fd < 0) {
1630 r = p->fd;
1631 goto rollback;
1632 }
1633 break;
1634
1635 case SOCKET_USB_FUNCTION: {
1636 _cleanup_free_ char *ep = NULL;
1637
1638 ep = path_make_absolute("ep0", p->path);
1639
1640 p->fd = usbffs_address_create(ep);
1641 if (p->fd < 0) {
1642 r = p->fd;
1643 goto rollback;
1644 }
1645
1646 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1647 if (r < 0)
1648 goto rollback;
1649
1650 r = usbffs_dispatch_eps(p);
1651 if (r < 0)
1652 goto rollback;
1653
1654 break;
1655 }
1656 default:
1657 assert_not_reached("Unknown port type");
1658 }
1659 }
1660
1661 return 0;
1662
1663 rollback:
1664 socket_close_fds(s);
1665 return r;
1666 }
1667
1668 static void socket_unwatch_fds(Socket *s) {
1669 SocketPort *p;
1670 int r;
1671
1672 assert(s);
1673
1674 LIST_FOREACH(port, p, s->ports) {
1675 if (p->fd < 0)
1676 continue;
1677
1678 if (!p->event_source)
1679 continue;
1680
1681 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1682 if (r < 0)
1683 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1684 }
1685 }
1686
1687 static int socket_watch_fds(Socket *s) {
1688 SocketPort *p;
1689 int r;
1690
1691 assert(s);
1692
1693 LIST_FOREACH(port, p, s->ports) {
1694 if (p->fd < 0)
1695 continue;
1696
1697 if (p->event_source) {
1698 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1699 if (r < 0)
1700 goto fail;
1701 } else {
1702 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1703 if (r < 0)
1704 goto fail;
1705
1706 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1707 }
1708 }
1709
1710 return 0;
1711
1712 fail:
1713 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1714 socket_unwatch_fds(s);
1715 return r;
1716 }
1717
1718 enum {
1719 SOCKET_OPEN_NONE,
1720 SOCKET_OPEN_SOME,
1721 SOCKET_OPEN_ALL,
1722 };
1723
1724 static int socket_check_open(Socket *s) {
1725 bool have_open = false, have_closed = false;
1726 SocketPort *p;
1727
1728 assert(s);
1729
1730 LIST_FOREACH(port, p, s->ports) {
1731 if (p->fd < 0)
1732 have_closed = true;
1733 else
1734 have_open = true;
1735
1736 if (have_open && have_closed)
1737 return SOCKET_OPEN_SOME;
1738 }
1739
1740 if (have_open)
1741 return SOCKET_OPEN_ALL;
1742
1743 return SOCKET_OPEN_NONE;
1744 }
1745
1746 static void socket_set_state(Socket *s, SocketState state) {
1747 SocketState old_state;
1748 assert(s);
1749
1750 old_state = s->state;
1751 s->state = state;
1752
1753 if (!IN_SET(state,
1754 SOCKET_START_PRE,
1755 SOCKET_START_CHOWN,
1756 SOCKET_START_POST,
1757 SOCKET_STOP_PRE,
1758 SOCKET_STOP_PRE_SIGTERM,
1759 SOCKET_STOP_PRE_SIGKILL,
1760 SOCKET_STOP_POST,
1761 SOCKET_FINAL_SIGTERM,
1762 SOCKET_FINAL_SIGKILL)) {
1763
1764 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1765 socket_unwatch_control_pid(s);
1766 s->control_command = NULL;
1767 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1768 }
1769
1770 if (state != SOCKET_LISTENING)
1771 socket_unwatch_fds(s);
1772
1773 if (!IN_SET(state,
1774 SOCKET_START_CHOWN,
1775 SOCKET_START_POST,
1776 SOCKET_LISTENING,
1777 SOCKET_RUNNING,
1778 SOCKET_STOP_PRE,
1779 SOCKET_STOP_PRE_SIGTERM,
1780 SOCKET_STOP_PRE_SIGKILL))
1781 socket_close_fds(s);
1782
1783 if (state != old_state)
1784 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1785
1786 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
1787 }
1788
1789 static int socket_coldplug(Unit *u) {
1790 Socket *s = SOCKET(u);
1791 int r;
1792
1793 assert(s);
1794 assert(s->state == SOCKET_DEAD);
1795
1796 if (s->deserialized_state == s->state)
1797 return 0;
1798
1799 if (s->control_pid > 0 &&
1800 pid_is_unwaited(s->control_pid) &&
1801 IN_SET(s->deserialized_state,
1802 SOCKET_START_PRE,
1803 SOCKET_START_CHOWN,
1804 SOCKET_START_POST,
1805 SOCKET_STOP_PRE,
1806 SOCKET_STOP_PRE_SIGTERM,
1807 SOCKET_STOP_PRE_SIGKILL,
1808 SOCKET_STOP_POST,
1809 SOCKET_FINAL_SIGTERM,
1810 SOCKET_FINAL_SIGKILL)) {
1811
1812 r = unit_watch_pid(UNIT(s), s->control_pid);
1813 if (r < 0)
1814 return r;
1815
1816 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1817 if (r < 0)
1818 return r;
1819 }
1820
1821 if (IN_SET(s->deserialized_state,
1822 SOCKET_START_CHOWN,
1823 SOCKET_START_POST,
1824 SOCKET_LISTENING,
1825 SOCKET_RUNNING)) {
1826
1827 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1828 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1829 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1830 * and if there's a mismatch, warn loudly. */
1831
1832 r = socket_check_open(s);
1833 if (r == SOCKET_OPEN_NONE)
1834 log_unit_warning(UNIT(s),
1835 "Socket unit configuration has changed while unit has been running, "
1836 "no open socket file descriptor left. "
1837 "The socket unit is not functional until restarted.");
1838 else if (r == SOCKET_OPEN_SOME)
1839 log_unit_warning(UNIT(s),
1840 "Socket unit configuration has changed while unit has been running, "
1841 "and some socket file descriptors have not been opened yet. "
1842 "The socket unit is not fully functional until restarted.");
1843 }
1844
1845 if (s->deserialized_state == SOCKET_LISTENING) {
1846 r = socket_watch_fds(s);
1847 if (r < 0)
1848 return r;
1849 }
1850
1851 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
1852 (void) unit_setup_dynamic_creds(u);
1853 (void) unit_setup_exec_runtime(u);
1854 }
1855
1856 socket_set_state(s, s->deserialized_state);
1857 return 0;
1858 }
1859
1860 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1861
1862 ExecParameters exec_params = {
1863 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1864 .stdin_fd = -1,
1865 .stdout_fd = -1,
1866 .stderr_fd = -1,
1867 .exec_fd = -1,
1868 };
1869 pid_t pid;
1870 int r;
1871
1872 assert(s);
1873 assert(c);
1874 assert(_pid);
1875
1876 r = unit_prepare_exec(UNIT(s));
1877 if (r < 0)
1878 return r;
1879
1880 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1881 if (r < 0)
1882 return r;
1883
1884 unit_set_exec_params(UNIT(s), &exec_params);
1885
1886 r = exec_spawn(UNIT(s),
1887 c,
1888 &s->exec_context,
1889 &exec_params,
1890 s->exec_runtime,
1891 &s->dynamic_creds,
1892 &pid);
1893 if (r < 0)
1894 return r;
1895
1896 r = unit_watch_pid(UNIT(s), pid);
1897 if (r < 0)
1898 /* FIXME: we need to do something here */
1899 return r;
1900
1901 *_pid = pid;
1902
1903 return 0;
1904 }
1905
1906 static int socket_chown(Socket *s, pid_t *_pid) {
1907 pid_t pid;
1908 int r;
1909
1910 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1911 if (r < 0)
1912 goto fail;
1913
1914 /* We have to resolve the user names out-of-process, hence
1915 * let's fork here. It's messy, but well, what can we do? */
1916
1917 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1918 if (r < 0)
1919 return r;
1920 if (r == 0) {
1921 uid_t uid = UID_INVALID;
1922 gid_t gid = GID_INVALID;
1923 SocketPort *p;
1924
1925 /* Child */
1926
1927 if (!isempty(s->user)) {
1928 const char *user = s->user;
1929
1930 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1931 if (r < 0) {
1932 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1933 _exit(EXIT_USER);
1934 }
1935 }
1936
1937 if (!isempty(s->group)) {
1938 const char *group = s->group;
1939
1940 r = get_group_creds(&group, &gid, 0);
1941 if (r < 0) {
1942 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1943 _exit(EXIT_GROUP);
1944 }
1945 }
1946
1947 LIST_FOREACH(port, p, s->ports) {
1948 const char *path = NULL;
1949
1950 if (p->type == SOCKET_SOCKET)
1951 path = socket_address_get_path(&p->address);
1952 else if (p->type == SOCKET_FIFO)
1953 path = p->path;
1954
1955 if (!path)
1956 continue;
1957
1958 if (chown(path, uid, gid) < 0) {
1959 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1960 _exit(EXIT_CHOWN);
1961 }
1962 }
1963
1964 _exit(EXIT_SUCCESS);
1965 }
1966
1967 r = unit_watch_pid(UNIT(s), pid);
1968 if (r < 0)
1969 goto fail;
1970
1971 *_pid = pid;
1972 return 0;
1973
1974 fail:
1975 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1976 return r;
1977 }
1978
1979 static void socket_enter_dead(Socket *s, SocketResult f) {
1980 assert(s);
1981
1982 if (s->result == SOCKET_SUCCESS)
1983 s->result = f;
1984
1985 if (s->result != SOCKET_SUCCESS)
1986 log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
1987
1988 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1989
1990 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1991
1992 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1993
1994 unit_unref_uid_gid(UNIT(s), true);
1995
1996 dynamic_creds_destroy(&s->dynamic_creds);
1997 }
1998
1999 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2000
2001 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2002 int r;
2003 assert(s);
2004
2005 if (s->result == SOCKET_SUCCESS)
2006 s->result = f;
2007
2008 socket_unwatch_control_pid(s);
2009 s->control_command_id = SOCKET_EXEC_STOP_POST;
2010 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2011
2012 if (s->control_command) {
2013 r = socket_spawn(s, s->control_command, &s->control_pid);
2014 if (r < 0)
2015 goto fail;
2016
2017 socket_set_state(s, SOCKET_STOP_POST);
2018 } else
2019 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2020
2021 return;
2022
2023 fail:
2024 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2025 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2026 }
2027
2028 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2029 int r;
2030
2031 assert(s);
2032
2033 if (s->result == SOCKET_SUCCESS)
2034 s->result = f;
2035
2036 r = unit_kill_context(
2037 UNIT(s),
2038 &s->kill_context,
2039 !IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_FINAL_SIGTERM) ?
2040 KILL_KILL : KILL_TERMINATE,
2041 -1,
2042 s->control_pid,
2043 false);
2044 if (r < 0)
2045 goto fail;
2046
2047 if (r > 0) {
2048 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2049 if (r < 0)
2050 goto fail;
2051
2052 socket_set_state(s, state);
2053 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2054 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2055 else if (state == SOCKET_STOP_PRE_SIGKILL)
2056 socket_enter_stop_post(s, SOCKET_SUCCESS);
2057 else if (state == SOCKET_FINAL_SIGTERM)
2058 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2059 else
2060 socket_enter_dead(s, SOCKET_SUCCESS);
2061
2062 return;
2063
2064 fail:
2065 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2066
2067 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2068 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2069 else
2070 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2071 }
2072
2073 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2074 int r;
2075 assert(s);
2076
2077 if (s->result == SOCKET_SUCCESS)
2078 s->result = f;
2079
2080 socket_unwatch_control_pid(s);
2081 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2082 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2083
2084 if (s->control_command) {
2085 r = socket_spawn(s, s->control_command, &s->control_pid);
2086 if (r < 0)
2087 goto fail;
2088
2089 socket_set_state(s, SOCKET_STOP_PRE);
2090 } else
2091 socket_enter_stop_post(s, SOCKET_SUCCESS);
2092
2093 return;
2094
2095 fail:
2096 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2097 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2098 }
2099
2100 static void socket_enter_listening(Socket *s) {
2101 int r;
2102 assert(s);
2103
2104 r = socket_watch_fds(s);
2105 if (r < 0) {
2106 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2107 goto fail;
2108 }
2109
2110 socket_set_state(s, SOCKET_LISTENING);
2111 return;
2112
2113 fail:
2114 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2115 }
2116
2117 static void socket_enter_start_post(Socket *s) {
2118 int r;
2119 assert(s);
2120
2121 socket_unwatch_control_pid(s);
2122 s->control_command_id = SOCKET_EXEC_START_POST;
2123 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2124
2125 if (s->control_command) {
2126 r = socket_spawn(s, s->control_command, &s->control_pid);
2127 if (r < 0) {
2128 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2129 goto fail;
2130 }
2131
2132 socket_set_state(s, SOCKET_START_POST);
2133 } else
2134 socket_enter_listening(s);
2135
2136 return;
2137
2138 fail:
2139 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2140 }
2141
2142 static void socket_enter_start_chown(Socket *s) {
2143 int r;
2144
2145 assert(s);
2146
2147 r = socket_open_fds(s);
2148 if (r < 0) {
2149 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2150 goto fail;
2151 }
2152
2153 if (!isempty(s->user) || !isempty(s->group)) {
2154
2155 socket_unwatch_control_pid(s);
2156 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2157 s->control_command = NULL;
2158
2159 r = socket_chown(s, &s->control_pid);
2160 if (r < 0) {
2161 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2162 goto fail;
2163 }
2164
2165 socket_set_state(s, SOCKET_START_CHOWN);
2166 } else
2167 socket_enter_start_post(s);
2168
2169 return;
2170
2171 fail:
2172 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2173 }
2174
2175 static void socket_enter_start_pre(Socket *s) {
2176 int r;
2177 assert(s);
2178
2179 socket_unwatch_control_pid(s);
2180
2181 unit_warn_leftover_processes(UNIT(s));
2182
2183 s->control_command_id = SOCKET_EXEC_START_PRE;
2184 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2185
2186 if (s->control_command) {
2187 r = socket_spawn(s, s->control_command, &s->control_pid);
2188 if (r < 0) {
2189 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2190 goto fail;
2191 }
2192
2193 socket_set_state(s, SOCKET_START_PRE);
2194 } else
2195 socket_enter_start_chown(s);
2196
2197 return;
2198
2199 fail:
2200 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2201 }
2202
2203 static void flush_ports(Socket *s) {
2204 SocketPort *p;
2205
2206 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2207 * anymore */
2208
2209 LIST_FOREACH(port, p, s->ports) {
2210 if (p->fd < 0)
2211 continue;
2212
2213 (void) flush_accept(p->fd);
2214 (void) flush_fd(p->fd);
2215 }
2216 }
2217
2218 static void socket_enter_running(Socket *s, int cfd) {
2219 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2220 int r;
2221
2222 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2223 * close it. */
2224
2225 assert(s);
2226
2227 /* We don't take connections anymore if we are supposed to shut down anyway */
2228 if (unit_stop_pending(UNIT(s))) {
2229
2230 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2231
2232 if (cfd >= 0)
2233 goto refuse;
2234 else
2235 flush_ports(s);
2236
2237 return;
2238 }
2239
2240 if (!ratelimit_below(&s->trigger_limit)) {
2241 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2242 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2243 goto refuse;
2244 }
2245
2246 if (cfd < 0) {
2247 bool pending = false;
2248 Unit *other;
2249 Iterator i;
2250 void *v;
2251
2252 /* If there's already a start pending don't bother to
2253 * do anything */
2254 HASHMAP_FOREACH_KEY(v, other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2255 if (unit_active_or_pending(other)) {
2256 pending = true;
2257 break;
2258 }
2259
2260 if (!pending) {
2261 if (!UNIT_ISSET(s->service)) {
2262 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2263 r = -ENOENT;
2264 goto fail;
2265 }
2266
2267 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2268 if (r < 0)
2269 goto fail;
2270 }
2271
2272 socket_set_state(s, SOCKET_RUNNING);
2273 } else {
2274 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2275 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2276 Service *service;
2277
2278 if (s->n_connections >= s->max_connections) {
2279 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2280 s->n_connections);
2281 goto refuse;
2282 }
2283
2284 if (s->max_connections_per_source > 0) {
2285 r = socket_acquire_peer(s, cfd, &p);
2286 if (r < 0) {
2287 goto refuse;
2288 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2289 _cleanup_free_ char *t = NULL;
2290
2291 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2292
2293 log_unit_warning(UNIT(s),
2294 "Too many incoming connections (%u) from source %s, dropping connection.",
2295 p->n_ref, strnull(t));
2296 goto refuse;
2297 }
2298 }
2299
2300 r = socket_instantiate_service(s);
2301 if (r < 0)
2302 goto fail;
2303
2304 r = instance_from_socket(cfd, s->n_accepted, &instance);
2305 if (r < 0) {
2306 if (r != -ENOTCONN)
2307 goto fail;
2308
2309 /* ENOTCONN is legitimate if TCP RST was received.
2310 * This connection is over, but the socket unit lives on. */
2311 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2312 goto refuse;
2313 }
2314
2315 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2316 if (r < 0)
2317 goto fail;
2318
2319 r = unit_name_build(prefix, instance, ".service", &name);
2320 if (r < 0)
2321 goto fail;
2322
2323 r = unit_add_name(UNIT_DEREF(s->service), name);
2324 if (r < 0)
2325 goto fail;
2326
2327 service = SERVICE(UNIT_DEREF(s->service));
2328 unit_ref_unset(&s->service);
2329
2330 s->n_accepted++;
2331 unit_choose_id(UNIT(service), name);
2332
2333 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2334 if (r < 0)
2335 goto fail;
2336
2337 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2338 s->n_connections++;
2339
2340 service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
2341
2342 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2343 if (r < 0) {
2344 /* We failed to activate the new service, but it still exists. Let's make sure the service
2345 * closes and forgets the connection fd again, immediately. */
2346 service_close_socket_fd(service);
2347 goto fail;
2348 }
2349
2350 /* Notify clients about changed counters */
2351 unit_add_to_dbus_queue(UNIT(s));
2352 }
2353
2354 return;
2355
2356 refuse:
2357 s->n_refused++;
2358 safe_close(cfd);
2359 return;
2360
2361 fail:
2362 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2363 cfd >= 0 ? "template" : "non-template",
2364 bus_error_message(&error, r));
2365
2366 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2367 safe_close(cfd);
2368 }
2369
2370 static void socket_run_next(Socket *s) {
2371 int r;
2372
2373 assert(s);
2374 assert(s->control_command);
2375 assert(s->control_command->command_next);
2376
2377 socket_unwatch_control_pid(s);
2378
2379 s->control_command = s->control_command->command_next;
2380
2381 r = socket_spawn(s, s->control_command, &s->control_pid);
2382 if (r < 0)
2383 goto fail;
2384
2385 return;
2386
2387 fail:
2388 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2389
2390 if (s->state == SOCKET_START_POST)
2391 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2392 else if (s->state == SOCKET_STOP_POST)
2393 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2394 else
2395 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2396 }
2397
2398 static int socket_start(Unit *u) {
2399 Socket *s = SOCKET(u);
2400 int r;
2401
2402 assert(s);
2403
2404 /* We cannot fulfill this request right now, try again later
2405 * please! */
2406 if (IN_SET(s->state,
2407 SOCKET_STOP_PRE,
2408 SOCKET_STOP_PRE_SIGKILL,
2409 SOCKET_STOP_PRE_SIGTERM,
2410 SOCKET_STOP_POST,
2411 SOCKET_FINAL_SIGTERM,
2412 SOCKET_FINAL_SIGKILL))
2413 return -EAGAIN;
2414
2415 /* Already on it! */
2416 if (IN_SET(s->state,
2417 SOCKET_START_PRE,
2418 SOCKET_START_CHOWN,
2419 SOCKET_START_POST))
2420 return 0;
2421
2422 /* Cannot run this without the service being around */
2423 if (UNIT_ISSET(s->service)) {
2424 Service *service;
2425
2426 service = SERVICE(UNIT_DEREF(s->service));
2427
2428 if (UNIT(service)->load_state != UNIT_LOADED) {
2429 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2430 return -ENOENT;
2431 }
2432
2433 /* If the service is already active we cannot start the
2434 * socket */
2435 if (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
2436 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2437 return -EBUSY;
2438 }
2439 }
2440
2441 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2442
2443 r = unit_start_limit_test(u);
2444 if (r < 0) {
2445 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2446 return r;
2447 }
2448
2449 r = unit_acquire_invocation_id(u);
2450 if (r < 0)
2451 return r;
2452
2453 s->result = SOCKET_SUCCESS;
2454 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2455
2456 u->reset_accounting = true;
2457
2458 socket_enter_start_pre(s);
2459 return 1;
2460 }
2461
2462 static int socket_stop(Unit *u) {
2463 Socket *s = SOCKET(u);
2464
2465 assert(s);
2466
2467 /* Already on it */
2468 if (IN_SET(s->state,
2469 SOCKET_STOP_PRE,
2470 SOCKET_STOP_PRE_SIGTERM,
2471 SOCKET_STOP_PRE_SIGKILL,
2472 SOCKET_STOP_POST,
2473 SOCKET_FINAL_SIGTERM,
2474 SOCKET_FINAL_SIGKILL))
2475 return 0;
2476
2477 /* If there's already something running we go directly into
2478 * kill mode. */
2479 if (IN_SET(s->state,
2480 SOCKET_START_PRE,
2481 SOCKET_START_CHOWN,
2482 SOCKET_START_POST)) {
2483 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2484 return -EAGAIN;
2485 }
2486
2487 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2488
2489 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2490 return 1;
2491 }
2492
2493 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2494 Socket *s = SOCKET(u);
2495 SocketPort *p;
2496 int r;
2497
2498 assert(u);
2499 assert(f);
2500 assert(fds);
2501
2502 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2503 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2504 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2505 unit_serialize_item_format(u, f, "n-refused", "%u", s->n_refused);
2506
2507 if (s->control_pid > 0)
2508 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2509
2510 if (s->control_command_id >= 0)
2511 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2512
2513 LIST_FOREACH(port, p, s->ports) {
2514 int copy;
2515
2516 if (p->fd < 0)
2517 continue;
2518
2519 copy = fdset_put_dup(fds, p->fd);
2520 if (copy < 0)
2521 return copy;
2522
2523 if (p->type == SOCKET_SOCKET) {
2524 _cleanup_free_ char *t = NULL;
2525
2526 r = socket_address_print(&p->address, &t);
2527 if (r < 0)
2528 return r;
2529
2530 if (socket_address_family(&p->address) == AF_NETLINK)
2531 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2532 else
2533 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2534
2535 } else if (p->type == SOCKET_SPECIAL)
2536 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2537 else if (p->type == SOCKET_MQUEUE)
2538 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2539 else if (p->type == SOCKET_USB_FUNCTION)
2540 unit_serialize_item_format(u, f, "ffs", "%i %s", copy, p->path);
2541 else {
2542 assert(p->type == SOCKET_FIFO);
2543 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2544 }
2545 }
2546
2547 return 0;
2548 }
2549
2550 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2551 safe_close(p->fd);
2552 p->fd = fdset_remove(fds, fd);
2553 }
2554
2555 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2556 Socket *s = SOCKET(u);
2557
2558 assert(u);
2559 assert(key);
2560 assert(value);
2561
2562 if (streq(key, "state")) {
2563 SocketState state;
2564
2565 state = socket_state_from_string(value);
2566 if (state < 0)
2567 log_unit_debug(u, "Failed to parse state value: %s", value);
2568 else
2569 s->deserialized_state = state;
2570 } else if (streq(key, "result")) {
2571 SocketResult f;
2572
2573 f = socket_result_from_string(value);
2574 if (f < 0)
2575 log_unit_debug(u, "Failed to parse result value: %s", value);
2576 else if (f != SOCKET_SUCCESS)
2577 s->result = f;
2578
2579 } else if (streq(key, "n-accepted")) {
2580 unsigned k;
2581
2582 if (safe_atou(value, &k) < 0)
2583 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2584 else
2585 s->n_accepted += k;
2586 } else if (streq(key, "n-refused")) {
2587 unsigned k;
2588
2589 if (safe_atou(value, &k) < 0)
2590 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2591 else
2592 s->n_refused += k;
2593 } else if (streq(key, "control-pid")) {
2594 pid_t pid;
2595
2596 if (parse_pid(value, &pid) < 0)
2597 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2598 else
2599 s->control_pid = pid;
2600 } else if (streq(key, "control-command")) {
2601 SocketExecCommand id;
2602
2603 id = socket_exec_command_from_string(value);
2604 if (id < 0)
2605 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2606 else {
2607 s->control_command_id = id;
2608 s->control_command = s->exec_command[id];
2609 }
2610 } else if (streq(key, "fifo")) {
2611 int fd, skip = 0;
2612 SocketPort *p;
2613
2614 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2615 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2616 else
2617 LIST_FOREACH(port, p, s->ports)
2618 if (p->type == SOCKET_FIFO &&
2619 path_equal_or_files_same(p->path, value+skip, 0)) {
2620 socket_port_take_fd(p, fds, fd);
2621 break;
2622 }
2623
2624 } else if (streq(key, "special")) {
2625 int fd, skip = 0;
2626 SocketPort *p;
2627
2628 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2629 log_unit_debug(u, "Failed to parse special value: %s", value);
2630 else
2631 LIST_FOREACH(port, p, s->ports)
2632 if (p->type == SOCKET_SPECIAL &&
2633 path_equal_or_files_same(p->path, value+skip, 0)) {
2634 socket_port_take_fd(p, fds, fd);
2635 break;
2636 }
2637
2638 } else if (streq(key, "mqueue")) {
2639 int fd, skip = 0;
2640 SocketPort *p;
2641
2642 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2643 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2644 else
2645 LIST_FOREACH(port, p, s->ports)
2646 if (p->type == SOCKET_MQUEUE &&
2647 streq(p->path, value+skip)) {
2648 socket_port_take_fd(p, fds, fd);
2649 break;
2650 }
2651
2652 } else if (streq(key, "socket")) {
2653 int fd, type, skip = 0;
2654 SocketPort *p;
2655
2656 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2657 log_unit_debug(u, "Failed to parse socket value: %s", value);
2658 else
2659 LIST_FOREACH(port, p, s->ports)
2660 if (socket_address_is(&p->address, value+skip, type)) {
2661 socket_port_take_fd(p, fds, fd);
2662 break;
2663 }
2664
2665 } else if (streq(key, "netlink")) {
2666 int fd, skip = 0;
2667 SocketPort *p;
2668
2669 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2670 log_unit_debug(u, "Failed to parse socket value: %s", value);
2671 else
2672 LIST_FOREACH(port, p, s->ports)
2673 if (socket_address_is_netlink(&p->address, value+skip)) {
2674 socket_port_take_fd(p, fds, fd);
2675 break;
2676 }
2677
2678 } else if (streq(key, "ffs")) {
2679 int fd, skip = 0;
2680 SocketPort *p;
2681
2682 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2683 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2684 else
2685 LIST_FOREACH(port, p, s->ports)
2686 if (p->type == SOCKET_USB_FUNCTION &&
2687 path_equal_or_files_same(p->path, value+skip, 0)) {
2688 socket_port_take_fd(p, fds, fd);
2689 break;
2690 }
2691
2692 } else
2693 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2694
2695 return 0;
2696 }
2697
2698 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2699 Socket *s = SOCKET(u);
2700 SocketPort *p;
2701
2702 assert(u);
2703
2704 LIST_FOREACH(port, p, s->ports) {
2705 Iterator i;
2706 int fd;
2707
2708 if (p->type != SOCKET_SOCKET)
2709 continue;
2710
2711 if (p->fd >= 0)
2712 continue;
2713
2714 FDSET_FOREACH(fd, fds, i) {
2715 if (socket_address_matches_fd(&p->address, fd)) {
2716 p->fd = fdset_remove(fds, fd);
2717 s->deserialized_state = SOCKET_LISTENING;
2718 break;
2719 }
2720 }
2721 }
2722 }
2723
2724 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2725 assert(u);
2726
2727 return state_translation_table[SOCKET(u)->state];
2728 }
2729
2730 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2731 assert(u);
2732
2733 return socket_state_to_string(SOCKET(u)->state);
2734 }
2735
2736 const char* socket_port_type_to_string(SocketPort *p) {
2737
2738 assert(p);
2739
2740 switch (p->type) {
2741
2742 case SOCKET_SOCKET:
2743
2744 switch (p->address.type) {
2745
2746 case SOCK_STREAM:
2747 return "Stream";
2748
2749 case SOCK_DGRAM:
2750 return "Datagram";
2751
2752 case SOCK_SEQPACKET:
2753 return "SequentialPacket";
2754
2755 case SOCK_RAW:
2756 if (socket_address_family(&p->address) == AF_NETLINK)
2757 return "Netlink";
2758
2759 _fallthrough_;
2760 default:
2761 return NULL;
2762 }
2763
2764 case SOCKET_SPECIAL:
2765 return "Special";
2766
2767 case SOCKET_MQUEUE:
2768 return "MessageQueue";
2769
2770 case SOCKET_FIFO:
2771 return "FIFO";
2772
2773 case SOCKET_USB_FUNCTION:
2774 return "USBFunction";
2775
2776 default:
2777 return NULL;
2778 }
2779 }
2780
2781 SocketType socket_port_type_from_string(const char *s) {
2782 assert(s);
2783
2784 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2785 return SOCKET_SOCKET;
2786 else if (streq(s, "Special"))
2787 return SOCKET_SPECIAL;
2788 else if (streq(s, "MessageQueue"))
2789 return SOCKET_MQUEUE;
2790 else if (streq(s, "FIFO"))
2791 return SOCKET_FIFO;
2792 else if (streq(s, "USBFunction"))
2793 return SOCKET_USB_FUNCTION;
2794 else
2795 return _SOCKET_TYPE_INVALID;
2796 }
2797
2798 _pure_ static bool socket_may_gc(Unit *u) {
2799 Socket *s = SOCKET(u);
2800
2801 assert(u);
2802
2803 return s->n_connections == 0;
2804 }
2805
2806 static int socket_accept_do(Socket *s, int fd) {
2807 int cfd;
2808
2809 assert(s);
2810 assert(fd >= 0);
2811
2812 for (;;) {
2813 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2814 if (cfd < 0) {
2815 if (errno == EINTR)
2816 continue;
2817
2818 return -errno;
2819 }
2820
2821 break;
2822 }
2823
2824 return cfd;
2825 }
2826
2827 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2828 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2829 int cfd, r;
2830 pid_t pid;
2831
2832 assert(s);
2833 assert(p);
2834 assert(fd >= 0);
2835
2836 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2837 * connection socket is also properly associated with the cgroup. */
2838
2839 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2840 goto shortcut;
2841
2842 r = bpf_firewall_supported();
2843 if (r < 0)
2844 return r;
2845 if (r == BPF_FIREWALL_UNSUPPORTED)
2846 goto shortcut;
2847
2848 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2849 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2850
2851 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2852 if (r < 0)
2853 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2854 if (r == 0) {
2855 /* Child */
2856
2857 pair[0] = safe_close(pair[0]);
2858
2859 cfd = socket_accept_do(s, fd);
2860 if (cfd < 0) {
2861 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2862 _exit(EXIT_FAILURE);
2863 }
2864
2865 r = send_one_fd(pair[1], cfd, 0);
2866 if (r < 0) {
2867 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2868 _exit(EXIT_FAILURE);
2869 }
2870
2871 _exit(EXIT_SUCCESS);
2872 }
2873
2874 pair[1] = safe_close(pair[1]);
2875 cfd = receive_one_fd(pair[0], 0);
2876
2877 /* We synchronously wait for the helper, as it shouldn't be slow */
2878 r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
2879 if (r < 0) {
2880 safe_close(cfd);
2881 return r;
2882 }
2883
2884 if (cfd < 0)
2885 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2886
2887 return cfd;
2888
2889 shortcut:
2890 cfd = socket_accept_do(s, fd);
2891 if (cfd < 0)
2892 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2893
2894 return cfd;
2895 }
2896
2897 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2898 SocketPort *p = userdata;
2899 int cfd = -1;
2900
2901 assert(p);
2902 assert(fd >= 0);
2903
2904 if (p->socket->state != SOCKET_LISTENING)
2905 return 0;
2906
2907 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2908
2909 if (revents != EPOLLIN) {
2910
2911 if (revents & EPOLLHUP)
2912 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.");
2913 else
2914 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2915 goto fail;
2916 }
2917
2918 if (p->socket->accept &&
2919 p->type == SOCKET_SOCKET &&
2920 socket_address_can_accept(&p->address)) {
2921
2922 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2923 if (cfd < 0)
2924 goto fail;
2925
2926 socket_apply_socket_options(p->socket, cfd);
2927 }
2928
2929 socket_enter_running(p->socket, cfd);
2930 return 0;
2931
2932 fail:
2933 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2934 return 0;
2935 }
2936
2937 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2938 Socket *s = SOCKET(u);
2939 SocketResult f;
2940
2941 assert(s);
2942 assert(pid >= 0);
2943
2944 if (pid != s->control_pid)
2945 return;
2946
2947 s->control_pid = 0;
2948
2949 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2950 f = SOCKET_SUCCESS;
2951 else if (code == CLD_EXITED)
2952 f = SOCKET_FAILURE_EXIT_CODE;
2953 else if (code == CLD_KILLED)
2954 f = SOCKET_FAILURE_SIGNAL;
2955 else if (code == CLD_DUMPED)
2956 f = SOCKET_FAILURE_CORE_DUMP;
2957 else
2958 assert_not_reached("Unknown sigchld code");
2959
2960 if (s->control_command) {
2961 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2962
2963 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2964 f = SOCKET_SUCCESS;
2965 }
2966
2967 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2968 "Control process exited, code=%s status=%i",
2969 sigchld_code_to_string(code), status);
2970
2971 if (s->result == SOCKET_SUCCESS)
2972 s->result = f;
2973
2974 if (s->control_command &&
2975 s->control_command->command_next &&
2976 f == SOCKET_SUCCESS) {
2977
2978 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2979 socket_run_next(s);
2980 } else {
2981 s->control_command = NULL;
2982 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2983
2984 /* No further commands for this step, so let's figure
2985 * out what to do next */
2986
2987 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2988
2989 switch (s->state) {
2990
2991 case SOCKET_START_PRE:
2992 if (f == SOCKET_SUCCESS)
2993 socket_enter_start_chown(s);
2994 else
2995 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2996 break;
2997
2998 case SOCKET_START_CHOWN:
2999 if (f == SOCKET_SUCCESS)
3000 socket_enter_start_post(s);
3001 else
3002 socket_enter_stop_pre(s, f);
3003 break;
3004
3005 case SOCKET_START_POST:
3006 if (f == SOCKET_SUCCESS)
3007 socket_enter_listening(s);
3008 else
3009 socket_enter_stop_pre(s, f);
3010 break;
3011
3012 case SOCKET_STOP_PRE:
3013 case SOCKET_STOP_PRE_SIGTERM:
3014 case SOCKET_STOP_PRE_SIGKILL:
3015 socket_enter_stop_post(s, f);
3016 break;
3017
3018 case SOCKET_STOP_POST:
3019 case SOCKET_FINAL_SIGTERM:
3020 case SOCKET_FINAL_SIGKILL:
3021 socket_enter_dead(s, f);
3022 break;
3023
3024 default:
3025 assert_not_reached("Uh, control process died at wrong time.");
3026 }
3027 }
3028
3029 /* Notify clients about changed exit status */
3030 unit_add_to_dbus_queue(u);
3031 }
3032
3033 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3034 Socket *s = SOCKET(userdata);
3035
3036 assert(s);
3037 assert(s->timer_event_source == source);
3038
3039 switch (s->state) {
3040
3041 case SOCKET_START_PRE:
3042 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3043 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3044 break;
3045
3046 case SOCKET_START_CHOWN:
3047 case SOCKET_START_POST:
3048 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3049 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3050 break;
3051
3052 case SOCKET_STOP_PRE:
3053 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3054 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3055 break;
3056
3057 case SOCKET_STOP_PRE_SIGTERM:
3058 if (s->kill_context.send_sigkill) {
3059 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3060 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3061 } else {
3062 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3063 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3064 }
3065 break;
3066
3067 case SOCKET_STOP_PRE_SIGKILL:
3068 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3069 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3070 break;
3071
3072 case SOCKET_STOP_POST:
3073 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3074 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3075 break;
3076
3077 case SOCKET_FINAL_SIGTERM:
3078 if (s->kill_context.send_sigkill) {
3079 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3080 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3081 } else {
3082 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3083 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3084 }
3085 break;
3086
3087 case SOCKET_FINAL_SIGKILL:
3088 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3089 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3090 break;
3091
3092 default:
3093 assert_not_reached("Timeout at wrong time.");
3094 }
3095
3096 return 0;
3097 }
3098
3099 int socket_collect_fds(Socket *s, int **fds) {
3100 size_t k = 0, n = 0;
3101 SocketPort *p;
3102 int *rfds;
3103
3104 assert(s);
3105 assert(fds);
3106
3107 /* Called from the service code for requesting our fds */
3108
3109 LIST_FOREACH(port, p, s->ports) {
3110 if (p->fd >= 0)
3111 n++;
3112 n += p->n_auxiliary_fds;
3113 }
3114
3115 if (n <= 0) {
3116 *fds = NULL;
3117 return 0;
3118 }
3119
3120 rfds = new(int, n);
3121 if (!rfds)
3122 return -ENOMEM;
3123
3124 LIST_FOREACH(port, p, s->ports) {
3125 size_t i;
3126
3127 if (p->fd >= 0)
3128 rfds[k++] = p->fd;
3129 for (i = 0; i < p->n_auxiliary_fds; ++i)
3130 rfds[k++] = p->auxiliary_fds[i];
3131 }
3132
3133 assert(k == n);
3134
3135 *fds = rfds;
3136 return (int) n;
3137 }
3138
3139 static void socket_reset_failed(Unit *u) {
3140 Socket *s = SOCKET(u);
3141
3142 assert(s);
3143
3144 if (s->state == SOCKET_FAILED)
3145 socket_set_state(s, SOCKET_DEAD);
3146
3147 s->result = SOCKET_SUCCESS;
3148 }
3149
3150 void socket_connection_unref(Socket *s) {
3151 assert(s);
3152
3153 /* The service is dead. Yay!
3154 *
3155 * This is strictly for one-instance-per-connection
3156 * services. */
3157
3158 assert(s->n_connections > 0);
3159 s->n_connections--;
3160
3161 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3162 }
3163
3164 static void socket_trigger_notify(Unit *u, Unit *other) {
3165 Socket *s = SOCKET(u);
3166
3167 assert(u);
3168 assert(other);
3169
3170 /* Filter out invocations with bogus state */
3171 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3172 return;
3173
3174 /* Don't propagate state changes from the service if we are already down */
3175 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3176 return;
3177
3178 /* We don't care for the service state if we are in Accept=yes mode */
3179 if (s->accept)
3180 return;
3181
3182 /* Propagate start limit hit state */
3183 if (other->start_limit_hit) {
3184 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3185 return;
3186 }
3187
3188 /* Don't propagate anything if there's still a job queued */
3189 if (other->job)
3190 return;
3191
3192 if (IN_SET(SERVICE(other)->state,
3193 SERVICE_DEAD, SERVICE_FAILED,
3194 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3195 SERVICE_AUTO_RESTART))
3196 socket_enter_listening(s);
3197
3198 if (SERVICE(other)->state == SERVICE_RUNNING)
3199 socket_set_state(s, SOCKET_RUNNING);
3200 }
3201
3202 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3203 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3204 }
3205
3206 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3207 Socket *s = SOCKET(u);
3208 usec_t t;
3209 int r;
3210
3211 if (!s->timer_event_source)
3212 return 0;
3213
3214 r = sd_event_source_get_time(s->timer_event_source, &t);
3215 if (r < 0)
3216 return r;
3217 if (t == USEC_INFINITY)
3218 return 0;
3219
3220 *timeout = t;
3221 return 1;
3222 }
3223
3224 char *socket_fdname(Socket *s) {
3225 assert(s);
3226
3227 /* Returns the name to use for $LISTEN_NAMES. If the user
3228 * didn't specify anything specifically, use the socket unit's
3229 * name as fallback. */
3230
3231 return s->fdname ?: UNIT(s)->id;
3232 }
3233
3234 static int socket_control_pid(Unit *u) {
3235 Socket *s = SOCKET(u);
3236
3237 assert(s);
3238
3239 return s->control_pid;
3240 }
3241
3242 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3243 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3244 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3245 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3246 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3247 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3248 };
3249
3250 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3251
3252 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3253 [SOCKET_SUCCESS] = "success",
3254 [SOCKET_FAILURE_RESOURCES] = "resources",
3255 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3256 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3257 [SOCKET_FAILURE_SIGNAL] = "signal",
3258 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3259 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3260 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3261 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3262 };
3263
3264 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3265
3266 const UnitVTable socket_vtable = {
3267 .object_size = sizeof(Socket),
3268 .exec_context_offset = offsetof(Socket, exec_context),
3269 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3270 .kill_context_offset = offsetof(Socket, kill_context),
3271 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3272 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3273
3274 .sections =
3275 "Unit\0"
3276 "Socket\0"
3277 "Install\0",
3278 .private_section = "Socket",
3279
3280 .can_transient = true,
3281
3282 .init = socket_init,
3283 .done = socket_done,
3284 .load = socket_load,
3285
3286 .coldplug = socket_coldplug,
3287
3288 .dump = socket_dump,
3289
3290 .start = socket_start,
3291 .stop = socket_stop,
3292
3293 .kill = socket_kill,
3294
3295 .get_timeout = socket_get_timeout,
3296
3297 .serialize = socket_serialize,
3298 .deserialize_item = socket_deserialize_item,
3299 .distribute_fds = socket_distribute_fds,
3300
3301 .active_state = socket_active_state,
3302 .sub_state_to_string = socket_sub_state_to_string,
3303
3304 .may_gc = socket_may_gc,
3305
3306 .sigchld_event = socket_sigchld_event,
3307
3308 .trigger_notify = socket_trigger_notify,
3309
3310 .reset_failed = socket_reset_failed,
3311
3312 .control_pid = socket_control_pid,
3313
3314 .bus_vtable = bus_socket_vtable,
3315 .bus_set_property = bus_socket_set_property,
3316 .bus_commit_properties = bus_socket_commit_properties,
3317
3318 .status_message_formats = {
3319 /*.starting_stopping = {
3320 [0] = "Starting socket %s...",
3321 [1] = "Stopping socket %s...",
3322 },*/
3323 .finished_start_job = {
3324 [JOB_DONE] = "Listening on %s.",
3325 [JOB_FAILED] = "Failed to listen on %s.",
3326 [JOB_TIMEOUT] = "Timed out starting %s.",
3327 },
3328 .finished_stop_job = {
3329 [JOB_DONE] = "Closed %s.",
3330 [JOB_FAILED] = "Failed stopping %s.",
3331 [JOB_TIMEOUT] = "Timed out stopping %s.",
3332 },
3333 },
3334 };
Unnamed repository; edit this file 'description' to name the repository.