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cgroup, unit, fragment parser: make use of new firewall functions
[thirdparty/systemd.git] / src / core / socket.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <arpa/inet.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <mqueue.h>
24 #include <netinet/tcp.h>
25 #include <signal.h>
26 #include <sys/epoll.h>
27 #include <sys/stat.h>
28 #include <unistd.h>
29 #include <linux/sctp.h>
30
31 #include "alloc-util.h"
32 #include "bus-error.h"
33 #include "bus-util.h"
34 #include "copy.h"
35 #include "dbus-socket.h"
36 #include "def.h"
37 #include "exit-status.h"
38 #include "fd-util.h"
39 #include "format-util.h"
40 #include "io-util.h"
41 #include "label.h"
42 #include "log.h"
43 #include "missing.h"
44 #include "mkdir.h"
45 #include "parse-util.h"
46 #include "path-util.h"
47 #include "process-util.h"
48 #include "selinux-util.h"
49 #include "signal-util.h"
50 #include "smack-util.h"
51 #include "socket.h"
52 #include "special.h"
53 #include "string-table.h"
54 #include "string-util.h"
55 #include "strv.h"
56 #include "unit-name.h"
57 #include "unit.h"
58 #include "user-util.h"
59 #include "in-addr-util.h"
60
61 struct SocketPeer {
62 unsigned n_ref;
63
64 Socket *socket;
65 union sockaddr_union peer;
66 socklen_t peer_salen;
67 };
68
69 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
70 [SOCKET_DEAD] = UNIT_INACTIVE,
71 [SOCKET_START_PRE] = UNIT_ACTIVATING,
72 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
73 [SOCKET_START_POST] = UNIT_ACTIVATING,
74 [SOCKET_LISTENING] = UNIT_ACTIVE,
75 [SOCKET_RUNNING] = UNIT_ACTIVE,
76 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
77 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
78 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
79 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
80 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
81 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
82 [SOCKET_FAILED] = UNIT_FAILED
83 };
84
85 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
86 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
87
88 static void socket_init(Unit *u) {
89 Socket *s = SOCKET(u);
90
91 assert(u);
92 assert(u->load_state == UNIT_STUB);
93
94 s->backlog = SOMAXCONN;
95 s->timeout_usec = u->manager->default_timeout_start_usec;
96 s->directory_mode = 0755;
97 s->socket_mode = 0666;
98
99 s->max_connections = 64;
100
101 s->priority = -1;
102 s->ip_tos = -1;
103 s->ip_ttl = -1;
104 s->mark = -1;
105
106 s->exec_context.std_output = u->manager->default_std_output;
107 s->exec_context.std_error = u->manager->default_std_error;
108
109 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
110
111 s->trigger_limit.interval = USEC_INFINITY;
112 s->trigger_limit.burst = (unsigned) -1;
113 }
114
115 static void socket_unwatch_control_pid(Socket *s) {
116 assert(s);
117
118 if (s->control_pid <= 0)
119 return;
120
121 unit_unwatch_pid(UNIT(s), s->control_pid);
122 s->control_pid = 0;
123 }
124
125 static void socket_cleanup_fd_list(SocketPort *p) {
126 assert(p);
127
128 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
129 p->auxiliary_fds = mfree(p->auxiliary_fds);
130 p->n_auxiliary_fds = 0;
131 }
132
133 void socket_free_ports(Socket *s) {
134 SocketPort *p;
135
136 assert(s);
137
138 while ((p = s->ports)) {
139 LIST_REMOVE(port, s->ports, p);
140
141 sd_event_source_unref(p->event_source);
142
143 socket_cleanup_fd_list(p);
144 safe_close(p->fd);
145 free(p->path);
146 free(p);
147 }
148 }
149
150 static void socket_done(Unit *u) {
151 Socket *s = SOCKET(u);
152 SocketPeer *p;
153
154 assert(s);
155
156 socket_free_ports(s);
157
158 while ((p = set_steal_first(s->peers_by_address)))
159 p->socket = NULL;
160
161 s->peers_by_address = set_free(s->peers_by_address);
162
163 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
164 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
165 s->control_command = NULL;
166
167 dynamic_creds_unref(&s->dynamic_creds);
168
169 socket_unwatch_control_pid(s);
170
171 unit_ref_unset(&s->service);
172
173 s->tcp_congestion = mfree(s->tcp_congestion);
174 s->bind_to_device = mfree(s->bind_to_device);
175
176 s->smack = mfree(s->smack);
177 s->smack_ip_in = mfree(s->smack_ip_in);
178 s->smack_ip_out = mfree(s->smack_ip_out);
179
180 strv_free(s->symlinks);
181
182 s->user = mfree(s->user);
183 s->group = mfree(s->group);
184
185 s->fdname = mfree(s->fdname);
186
187 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
188 }
189
190 static int socket_arm_timer(Socket *s, usec_t usec) {
191 int r;
192
193 assert(s);
194
195 if (s->timer_event_source) {
196 r = sd_event_source_set_time(s->timer_event_source, usec);
197 if (r < 0)
198 return r;
199
200 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
201 }
202
203 if (usec == USEC_INFINITY)
204 return 0;
205
206 r = sd_event_add_time(
207 UNIT(s)->manager->event,
208 &s->timer_event_source,
209 CLOCK_MONOTONIC,
210 usec, 0,
211 socket_dispatch_timer, s);
212 if (r < 0)
213 return r;
214
215 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
216
217 return 0;
218 }
219
220 int socket_instantiate_service(Socket *s) {
221 _cleanup_free_ char *prefix = NULL, *name = NULL;
222 int r;
223 Unit *u;
224
225 assert(s);
226
227 /* This fills in s->service if it isn't filled in yet. For
228 * Accept=yes sockets we create the next connection service
229 * here. For Accept=no this is mostly a NOP since the service
230 * is figured out at load time anyway. */
231
232 if (UNIT_DEREF(s->service))
233 return 0;
234
235 if (!s->accept)
236 return 0;
237
238 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
239 if (r < 0)
240 return r;
241
242 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
243 return -ENOMEM;
244
245 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
246 if (r < 0)
247 return r;
248
249 unit_ref_set(&s->service, u);
250
251 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
252 }
253
254 static bool have_non_accept_socket(Socket *s) {
255 SocketPort *p;
256
257 assert(s);
258
259 if (!s->accept)
260 return true;
261
262 LIST_FOREACH(port, p, s->ports) {
263
264 if (p->type != SOCKET_SOCKET)
265 return true;
266
267 if (!socket_address_can_accept(&p->address))
268 return true;
269 }
270
271 return false;
272 }
273
274 static int socket_add_mount_links(Socket *s) {
275 SocketPort *p;
276 int r;
277
278 assert(s);
279
280 LIST_FOREACH(port, p, s->ports) {
281 const char *path = NULL;
282
283 if (p->type == SOCKET_SOCKET)
284 path = socket_address_get_path(&p->address);
285 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
286 path = p->path;
287
288 if (!path)
289 continue;
290
291 r = unit_require_mounts_for(UNIT(s), path);
292 if (r < 0)
293 return r;
294 }
295
296 return 0;
297 }
298
299 static int socket_add_device_link(Socket *s) {
300 char *t;
301
302 assert(s);
303
304 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
305 return 0;
306
307 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
308 return unit_add_node_link(UNIT(s), t, false, UNIT_BINDS_TO);
309 }
310
311 static int socket_add_default_dependencies(Socket *s) {
312 int r;
313 assert(s);
314
315 if (!UNIT(s)->default_dependencies)
316 return 0;
317
318 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true);
319 if (r < 0)
320 return r;
321
322 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
323 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
324 if (r < 0)
325 return r;
326 }
327
328 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
329 }
330
331 _pure_ static bool socket_has_exec(Socket *s) {
332 unsigned i;
333 assert(s);
334
335 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
336 if (s->exec_command[i])
337 return true;
338
339 return false;
340 }
341
342 static int socket_add_extras(Socket *s) {
343 Unit *u = UNIT(s);
344 int r;
345
346 assert(s);
347
348 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
349 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
350 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
351 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
352 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
353 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
354 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
355 * service starts are typical. */
356
357 if (s->trigger_limit.interval == USEC_INFINITY)
358 s->trigger_limit.interval = 2 * USEC_PER_SEC;
359
360 if (s->trigger_limit.burst == (unsigned) -1) {
361 if (s->accept)
362 s->trigger_limit.burst = 200;
363 else
364 s->trigger_limit.burst = 20;
365 }
366
367 if (have_non_accept_socket(s)) {
368
369 if (!UNIT_DEREF(s->service)) {
370 Unit *x;
371
372 r = unit_load_related_unit(u, ".service", &x);
373 if (r < 0)
374 return r;
375
376 unit_ref_set(&s->service, x);
377 }
378
379 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
380 if (r < 0)
381 return r;
382 }
383
384 r = socket_add_mount_links(s);
385 if (r < 0)
386 return r;
387
388 r = socket_add_device_link(s);
389 if (r < 0)
390 return r;
391
392 r = unit_patch_contexts(u);
393 if (r < 0)
394 return r;
395
396 if (socket_has_exec(s)) {
397 r = unit_add_exec_dependencies(u, &s->exec_context);
398 if (r < 0)
399 return r;
400
401 r = unit_set_default_slice(u);
402 if (r < 0)
403 return r;
404 }
405
406 r = socket_add_default_dependencies(s);
407 if (r < 0)
408 return r;
409
410 return 0;
411 }
412
413 static const char *socket_find_symlink_target(Socket *s) {
414 const char *found = NULL;
415 SocketPort *p;
416
417 LIST_FOREACH(port, p, s->ports) {
418 const char *f = NULL;
419
420 switch (p->type) {
421
422 case SOCKET_FIFO:
423 f = p->path;
424 break;
425
426 case SOCKET_SOCKET:
427 f = socket_address_get_path(&p->address);
428 break;
429
430 default:
431 break;
432 }
433
434 if (f) {
435 if (found)
436 return NULL;
437
438 found = f;
439 }
440 }
441
442 return found;
443 }
444
445 static int socket_verify(Socket *s) {
446 assert(s);
447
448 if (UNIT(s)->load_state != UNIT_LOADED)
449 return 0;
450
451 if (!s->ports) {
452 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
453 return -EINVAL;
454 }
455
456 if (s->accept && have_non_accept_socket(s)) {
457 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
458 return -EINVAL;
459 }
460
461 if (s->accept && s->max_connections <= 0) {
462 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
463 return -EINVAL;
464 }
465
466 if (s->accept && UNIT_DEREF(s->service)) {
467 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
468 return -EINVAL;
469 }
470
471 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
472 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
473 return -EINVAL;
474 }
475
476 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
477 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
478 return -EINVAL;
479 }
480
481 return 0;
482 }
483
484 static void peer_address_hash_func(const void *p, struct siphash *state) {
485 const SocketPeer *s = p;
486
487 assert(s);
488
489 if (s->peer.sa.sa_family == AF_INET)
490 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
491 else if (s->peer.sa.sa_family == AF_INET6)
492 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
493 else if (s->peer.sa.sa_family == AF_VSOCK)
494 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
495 else
496 assert_not_reached("Unknown address family.");
497 }
498
499 static int peer_address_compare_func(const void *a, const void *b) {
500 const SocketPeer *x = a, *y = b;
501
502 if (x->peer.sa.sa_family < y->peer.sa.sa_family)
503 return -1;
504 if (x->peer.sa.sa_family > y->peer.sa.sa_family)
505 return 1;
506
507 switch(x->peer.sa.sa_family) {
508 case AF_INET:
509 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
510 case AF_INET6:
511 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
512 case AF_VSOCK:
513 if (x->peer.vm.svm_cid < y->peer.vm.svm_cid)
514 return -1;
515 if (x->peer.vm.svm_cid > y->peer.vm.svm_cid)
516 return 1;
517 return 0;
518 }
519 assert_not_reached("Black sheep in the family!");
520 }
521
522 const struct hash_ops peer_address_hash_ops = {
523 .hash = peer_address_hash_func,
524 .compare = peer_address_compare_func
525 };
526
527 static int socket_load(Unit *u) {
528 Socket *s = SOCKET(u);
529 int r;
530
531 assert(u);
532 assert(u->load_state == UNIT_STUB);
533
534 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
535 if (r < 0)
536 return r;
537
538 r = unit_load_fragment_and_dropin(u);
539 if (r < 0)
540 return r;
541
542 if (u->load_state == UNIT_LOADED) {
543 /* This is a new unit? Then let's add in some extras */
544 r = socket_add_extras(s);
545 if (r < 0)
546 return r;
547 }
548
549 return socket_verify(s);
550 }
551
552 static SocketPeer *socket_peer_new(void) {
553 SocketPeer *p;
554
555 p = new0(SocketPeer, 1);
556 if (!p)
557 return NULL;
558
559 p->n_ref = 1;
560
561 return p;
562 }
563
564 SocketPeer *socket_peer_ref(SocketPeer *p) {
565 if (!p)
566 return NULL;
567
568 assert(p->n_ref > 0);
569 p->n_ref++;
570
571 return p;
572 }
573
574 SocketPeer *socket_peer_unref(SocketPeer *p) {
575 if (!p)
576 return NULL;
577
578 assert(p->n_ref > 0);
579
580 p->n_ref--;
581
582 if (p->n_ref > 0)
583 return NULL;
584
585 if (p->socket)
586 set_remove(p->socket->peers_by_address, p);
587
588 return mfree(p);
589 }
590
591 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
592 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
593 SocketPeer sa = {}, *i;
594 socklen_t salen = sizeof(sa.peer);
595 int r;
596
597 assert(fd >= 0);
598 assert(s);
599
600 r = getpeername(fd, &sa.peer.sa, &salen);
601 if (r < 0)
602 return log_error_errno(errno, "getpeername failed: %m");
603
604 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
605 *p = NULL;
606 return 0;
607 }
608
609 i = set_get(s->peers_by_address, &sa);
610 if (i) {
611 *p = socket_peer_ref(i);
612 return 1;
613 }
614
615 remote = socket_peer_new();
616 if (!remote)
617 return log_oom();
618
619 remote->peer = sa.peer;
620 remote->peer_salen = salen;
621
622 r = set_put(s->peers_by_address, remote);
623 if (r < 0)
624 return r;
625
626 remote->socket = s;
627
628 *p = remote;
629 remote = NULL;
630
631 return 1;
632 }
633
634 _const_ static const char* listen_lookup(int family, int type) {
635
636 if (family == AF_NETLINK)
637 return "ListenNetlink";
638
639 if (type == SOCK_STREAM)
640 return "ListenStream";
641 else if (type == SOCK_DGRAM)
642 return "ListenDatagram";
643 else if (type == SOCK_SEQPACKET)
644 return "ListenSequentialPacket";
645
646 assert_not_reached("Unknown socket type");
647 return NULL;
648 }
649
650 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
651 char time_string[FORMAT_TIMESPAN_MAX];
652 SocketExecCommand c;
653 Socket *s = SOCKET(u);
654 SocketPort *p;
655 const char *prefix2;
656
657 assert(s);
658 assert(f);
659
660 prefix = strempty(prefix);
661 prefix2 = strjoina(prefix, "\t");
662
663 fprintf(f,
664 "%sSocket State: %s\n"
665 "%sResult: %s\n"
666 "%sBindIPv6Only: %s\n"
667 "%sBacklog: %u\n"
668 "%sSocketMode: %04o\n"
669 "%sDirectoryMode: %04o\n"
670 "%sKeepAlive: %s\n"
671 "%sNoDelay: %s\n"
672 "%sFreeBind: %s\n"
673 "%sTransparent: %s\n"
674 "%sBroadcast: %s\n"
675 "%sPassCredentials: %s\n"
676 "%sPassSecurity: %s\n"
677 "%sTCPCongestion: %s\n"
678 "%sRemoveOnStop: %s\n"
679 "%sWritable: %s\n"
680 "%sFDName: %s\n"
681 "%sSELinuxContextFromNet: %s\n",
682 prefix, socket_state_to_string(s->state),
683 prefix, socket_result_to_string(s->result),
684 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
685 prefix, s->backlog,
686 prefix, s->socket_mode,
687 prefix, s->directory_mode,
688 prefix, yes_no(s->keep_alive),
689 prefix, yes_no(s->no_delay),
690 prefix, yes_no(s->free_bind),
691 prefix, yes_no(s->transparent),
692 prefix, yes_no(s->broadcast),
693 prefix, yes_no(s->pass_cred),
694 prefix, yes_no(s->pass_sec),
695 prefix, strna(s->tcp_congestion),
696 prefix, yes_no(s->remove_on_stop),
697 prefix, yes_no(s->writable),
698 prefix, socket_fdname(s),
699 prefix, yes_no(s->selinux_context_from_net));
700
701 if (s->control_pid > 0)
702 fprintf(f,
703 "%sControl PID: "PID_FMT"\n",
704 prefix, s->control_pid);
705
706 if (s->bind_to_device)
707 fprintf(f,
708 "%sBindToDevice: %s\n",
709 prefix, s->bind_to_device);
710
711 if (s->accept)
712 fprintf(f,
713 "%sAccepted: %u\n"
714 "%sNConnections: %u\n"
715 "%sMaxConnections: %u\n",
716 prefix, s->n_accepted,
717 prefix, s->n_connections,
718 prefix, s->max_connections);
719
720 if (s->priority >= 0)
721 fprintf(f,
722 "%sPriority: %i\n",
723 prefix, s->priority);
724
725 if (s->receive_buffer > 0)
726 fprintf(f,
727 "%sReceiveBuffer: %zu\n",
728 prefix, s->receive_buffer);
729
730 if (s->send_buffer > 0)
731 fprintf(f,
732 "%sSendBuffer: %zu\n",
733 prefix, s->send_buffer);
734
735 if (s->ip_tos >= 0)
736 fprintf(f,
737 "%sIPTOS: %i\n",
738 prefix, s->ip_tos);
739
740 if (s->ip_ttl >= 0)
741 fprintf(f,
742 "%sIPTTL: %i\n",
743 prefix, s->ip_ttl);
744
745 if (s->pipe_size > 0)
746 fprintf(f,
747 "%sPipeSize: %zu\n",
748 prefix, s->pipe_size);
749
750 if (s->mark >= 0)
751 fprintf(f,
752 "%sMark: %i\n",
753 prefix, s->mark);
754
755 if (s->mq_maxmsg > 0)
756 fprintf(f,
757 "%sMessageQueueMaxMessages: %li\n",
758 prefix, s->mq_maxmsg);
759
760 if (s->mq_msgsize > 0)
761 fprintf(f,
762 "%sMessageQueueMessageSize: %li\n",
763 prefix, s->mq_msgsize);
764
765 if (s->reuse_port)
766 fprintf(f,
767 "%sReusePort: %s\n",
768 prefix, yes_no(s->reuse_port));
769
770 if (s->smack)
771 fprintf(f,
772 "%sSmackLabel: %s\n",
773 prefix, s->smack);
774
775 if (s->smack_ip_in)
776 fprintf(f,
777 "%sSmackLabelIPIn: %s\n",
778 prefix, s->smack_ip_in);
779
780 if (s->smack_ip_out)
781 fprintf(f,
782 "%sSmackLabelIPOut: %s\n",
783 prefix, s->smack_ip_out);
784
785 if (!isempty(s->user) || !isempty(s->group))
786 fprintf(f,
787 "%sSocketUser: %s\n"
788 "%sSocketGroup: %s\n",
789 prefix, strna(s->user),
790 prefix, strna(s->group));
791
792 if (s->keep_alive_time > 0)
793 fprintf(f,
794 "%sKeepAliveTimeSec: %s\n",
795 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
796
797 if (s->keep_alive_interval)
798 fprintf(f,
799 "%sKeepAliveIntervalSec: %s\n",
800 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
801
802 if (s->keep_alive_cnt)
803 fprintf(f,
804 "%sKeepAliveProbes: %u\n",
805 prefix, s->keep_alive_cnt);
806
807 if (s->defer_accept)
808 fprintf(f,
809 "%sDeferAcceptSec: %s\n",
810 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
811
812 LIST_FOREACH(port, p, s->ports) {
813
814 if (p->type == SOCKET_SOCKET) {
815 const char *t;
816 int r;
817 char *k = NULL;
818
819 r = socket_address_print(&p->address, &k);
820 if (r < 0)
821 t = strerror(-r);
822 else
823 t = k;
824
825 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
826 free(k);
827 } else if (p->type == SOCKET_SPECIAL)
828 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
829 else if (p->type == SOCKET_USB_FUNCTION)
830 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
831 else if (p->type == SOCKET_MQUEUE)
832 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
833 else
834 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
835 }
836
837 fprintf(f,
838 "%sTriggerLimitIntervalSec: %s\n"
839 "%sTriggerLimitBurst: %u\n",
840 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
841 prefix, s->trigger_limit.burst);
842
843 exec_context_dump(&s->exec_context, f, prefix);
844 kill_context_dump(&s->kill_context, f, prefix);
845
846 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
847 if (!s->exec_command[c])
848 continue;
849
850 fprintf(f, "%s-> %s:\n",
851 prefix, socket_exec_command_to_string(c));
852
853 exec_command_dump_list(s->exec_command[c], f, prefix2);
854 }
855
856 cgroup_context_dump(&s->cgroup_context, f, prefix);
857 }
858
859 static int instance_from_socket(int fd, unsigned nr, char **instance) {
860 socklen_t l;
861 char *r;
862 union sockaddr_union local, remote;
863
864 assert(fd >= 0);
865 assert(instance);
866
867 l = sizeof(local);
868 if (getsockname(fd, &local.sa, &l) < 0)
869 return -errno;
870
871 l = sizeof(remote);
872 if (getpeername(fd, &remote.sa, &l) < 0)
873 return -errno;
874
875 switch (local.sa.sa_family) {
876
877 case AF_INET: {
878 uint32_t
879 a = be32toh(local.in.sin_addr.s_addr),
880 b = be32toh(remote.in.sin_addr.s_addr);
881
882 if (asprintf(&r,
883 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
884 nr,
885 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
886 be16toh(local.in.sin_port),
887 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
888 be16toh(remote.in.sin_port)) < 0)
889 return -ENOMEM;
890
891 break;
892 }
893
894 case AF_INET6: {
895 static const unsigned char ipv4_prefix[] = {
896 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
897 };
898
899 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
900 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
901 const uint8_t
902 *a = local.in6.sin6_addr.s6_addr+12,
903 *b = remote.in6.sin6_addr.s6_addr+12;
904
905 if (asprintf(&r,
906 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
907 nr,
908 a[0], a[1], a[2], a[3],
909 be16toh(local.in6.sin6_port),
910 b[0], b[1], b[2], b[3],
911 be16toh(remote.in6.sin6_port)) < 0)
912 return -ENOMEM;
913 } else {
914 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
915
916 if (asprintf(&r,
917 "%u-%s:%u-%s:%u",
918 nr,
919 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
920 be16toh(local.in6.sin6_port),
921 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
922 be16toh(remote.in6.sin6_port)) < 0)
923 return -ENOMEM;
924 }
925
926 break;
927 }
928
929 case AF_UNIX: {
930 struct ucred ucred;
931 int k;
932
933 k = getpeercred(fd, &ucred);
934 if (k >= 0) {
935 if (asprintf(&r,
936 "%u-"PID_FMT"-"UID_FMT,
937 nr, ucred.pid, ucred.uid) < 0)
938 return -ENOMEM;
939 } else if (k == -ENODATA) {
940 /* This handles the case where somebody is
941 * connecting from another pid/uid namespace
942 * (e.g. from outside of our container). */
943 if (asprintf(&r,
944 "%u-unknown",
945 nr) < 0)
946 return -ENOMEM;
947 } else
948 return k;
949
950 break;
951 }
952
953 case AF_VSOCK:
954 if (asprintf(&r,
955 "%u-%u:%u-%u:%u",
956 nr,
957 local.vm.svm_cid, local.vm.svm_port,
958 remote.vm.svm_cid, remote.vm.svm_port) < 0)
959 return -ENOMEM;
960
961 break;
962
963 default:
964 assert_not_reached("Unhandled socket type.");
965 }
966
967 *instance = r;
968 return 0;
969 }
970
971 static void socket_close_fds(Socket *s) {
972 SocketPort *p;
973 char **i;
974
975 assert(s);
976
977 LIST_FOREACH(port, p, s->ports) {
978 bool was_open;
979
980 was_open = p->fd >= 0;
981
982 p->event_source = sd_event_source_unref(p->event_source);
983 p->fd = safe_close(p->fd);
984 socket_cleanup_fd_list(p);
985
986 /* One little note: we should normally not delete any sockets in the file system here! After all some
987 * other process we spawned might still have a reference of this fd and wants to continue to use
988 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
989 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
990 * anyway, but only then. */
991
992 if (!was_open || !s->remove_on_stop)
993 continue;
994
995 switch (p->type) {
996
997 case SOCKET_FIFO:
998 (void) unlink(p->path);
999 break;
1000
1001 case SOCKET_MQUEUE:
1002 (void) mq_unlink(p->path);
1003 break;
1004
1005 case SOCKET_SOCKET:
1006 (void) socket_address_unlink(&p->address);
1007 break;
1008
1009 default:
1010 break;
1011 }
1012 }
1013
1014 if (s->remove_on_stop)
1015 STRV_FOREACH(i, s->symlinks)
1016 (void) unlink(*i);
1017 }
1018
1019 static void socket_apply_socket_options(Socket *s, int fd) {
1020 int r;
1021
1022 assert(s);
1023 assert(fd >= 0);
1024
1025 if (s->keep_alive) {
1026 int b = s->keep_alive;
1027 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
1028 log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
1029 }
1030
1031 if (s->keep_alive_time) {
1032 int value = s->keep_alive_time / USEC_PER_SEC;
1033 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
1034 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m");
1035 }
1036
1037 if (s->keep_alive_interval) {
1038 int value = s->keep_alive_interval / USEC_PER_SEC;
1039 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
1040 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m");
1041 }
1042
1043 if (s->keep_alive_cnt) {
1044 int value = s->keep_alive_cnt;
1045 if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
1046 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
1047 }
1048
1049 if (s->defer_accept) {
1050 int value = s->defer_accept / USEC_PER_SEC;
1051 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
1052 log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m");
1053 }
1054
1055 if (s->no_delay) {
1056 int b = s->no_delay;
1057
1058 if (s->socket_protocol == IPPROTO_SCTP) {
1059 if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &b, sizeof(b)) < 0)
1060 log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
1061 } else {
1062 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
1063 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
1064 }
1065 }
1066
1067 if (s->broadcast) {
1068 int one = 1;
1069 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
1070 log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
1071 }
1072
1073 if (s->pass_cred) {
1074 int one = 1;
1075 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
1076 log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
1077 }
1078
1079 if (s->pass_sec) {
1080 int one = 1;
1081 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
1082 log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
1083 }
1084
1085 if (s->priority >= 0)
1086 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
1087 log_unit_warning_errno(UNIT(s), errno, "SO_PRIORITY failed: %m");
1088
1089 if (s->receive_buffer > 0) {
1090 int value = (int) s->receive_buffer;
1091
1092 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1093
1094 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
1095 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
1096 log_unit_warning_errno(UNIT(s), errno, "SO_RCVBUF failed: %m");
1097 }
1098
1099 if (s->send_buffer > 0) {
1100 int value = (int) s->send_buffer;
1101 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
1102 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
1103 log_unit_warning_errno(UNIT(s), errno, "SO_SNDBUF failed: %m");
1104 }
1105
1106 if (s->mark >= 0)
1107 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
1108 log_unit_warning_errno(UNIT(s), errno, "SO_MARK failed: %m");
1109
1110 if (s->ip_tos >= 0)
1111 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
1112 log_unit_warning_errno(UNIT(s), errno, "IP_TOS failed: %m");
1113
1114 if (s->ip_ttl >= 0) {
1115 int x;
1116
1117 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
1118
1119 if (socket_ipv6_is_supported())
1120 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
1121 else {
1122 x = -1;
1123 errno = EAFNOSUPPORT;
1124 }
1125
1126 if (r < 0 && x < 0)
1127 log_unit_warning_errno(UNIT(s), errno, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1128 }
1129
1130 if (s->tcp_congestion)
1131 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1132 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1133
1134 if (s->smack_ip_in) {
1135 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1136 if (r < 0)
1137 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1138 }
1139
1140 if (s->smack_ip_out) {
1141 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1142 if (r < 0)
1143 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1144 }
1145 }
1146
1147 static void socket_apply_fifo_options(Socket *s, int fd) {
1148 int r;
1149
1150 assert(s);
1151 assert(fd >= 0);
1152
1153 if (s->pipe_size > 0)
1154 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1155 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1156
1157 if (s->smack) {
1158 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1159 if (r < 0)
1160 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1161 }
1162 }
1163
1164 static int fifo_address_create(
1165 const char *path,
1166 mode_t directory_mode,
1167 mode_t socket_mode) {
1168
1169 _cleanup_close_ int fd = -1;
1170 mode_t old_mask;
1171 struct stat st;
1172 int r;
1173
1174 assert(path);
1175
1176 mkdir_parents_label(path, directory_mode);
1177
1178 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1179 if (r < 0)
1180 return r;
1181
1182 /* Enforce the right access mode for the fifo */
1183 old_mask = umask(~ socket_mode);
1184
1185 /* Include the original umask in our mask */
1186 (void) umask(~socket_mode | old_mask);
1187
1188 r = mkfifo(path, socket_mode);
1189 (void) umask(old_mask);
1190
1191 if (r < 0 && errno != EEXIST) {
1192 r = -errno;
1193 goto fail;
1194 }
1195
1196 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1197 if (fd < 0) {
1198 r = -errno;
1199 goto fail;
1200 }
1201
1202 mac_selinux_create_file_clear();
1203
1204 if (fstat(fd, &st) < 0) {
1205 r = -errno;
1206 goto fail;
1207 }
1208
1209 if (!S_ISFIFO(st.st_mode) ||
1210 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1211 st.st_uid != getuid() ||
1212 st.st_gid != getgid()) {
1213 r = -EEXIST;
1214 goto fail;
1215 }
1216
1217 r = fd;
1218 fd = -1;
1219
1220 return r;
1221
1222 fail:
1223 mac_selinux_create_file_clear();
1224 return r;
1225 }
1226
1227 static int special_address_create(const char *path, bool writable) {
1228 _cleanup_close_ int fd = -1;
1229 struct stat st;
1230 int r;
1231
1232 assert(path);
1233
1234 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1235 if (fd < 0)
1236 return -errno;
1237
1238 if (fstat(fd, &st) < 0)
1239 return -errno;
1240
1241 /* Check whether this is a /proc, /sys or /dev file or char device */
1242 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1243 return -EEXIST;
1244
1245 r = fd;
1246 fd = -1;
1247
1248 return r;
1249 }
1250
1251 static int usbffs_address_create(const char *path) {
1252 _cleanup_close_ int fd = -1;
1253 struct stat st;
1254 int r;
1255
1256 assert(path);
1257
1258 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1259 if (fd < 0)
1260 return -errno;
1261
1262 if (fstat(fd, &st) < 0)
1263 return -errno;
1264
1265 /* Check whether this is a regular file (ffs endpoint) */
1266 if (!S_ISREG(st.st_mode))
1267 return -EEXIST;
1268
1269 r = fd;
1270 fd = -1;
1271
1272 return r;
1273 }
1274
1275 static int mq_address_create(
1276 const char *path,
1277 mode_t mq_mode,
1278 long maxmsg,
1279 long msgsize) {
1280
1281 _cleanup_close_ int fd = -1;
1282 struct stat st;
1283 mode_t old_mask;
1284 struct mq_attr _attr, *attr = NULL;
1285 int r;
1286
1287 assert(path);
1288
1289 if (maxmsg > 0 && msgsize > 0) {
1290 _attr = (struct mq_attr) {
1291 .mq_flags = O_NONBLOCK,
1292 .mq_maxmsg = maxmsg,
1293 .mq_msgsize = msgsize,
1294 };
1295 attr = &_attr;
1296 }
1297
1298 /* Enforce the right access mode for the mq */
1299 old_mask = umask(~ mq_mode);
1300
1301 /* Include the original umask in our mask */
1302 (void) umask(~mq_mode | old_mask);
1303 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1304 (void) umask(old_mask);
1305
1306 if (fd < 0)
1307 return -errno;
1308
1309 if (fstat(fd, &st) < 0)
1310 return -errno;
1311
1312 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1313 st.st_uid != getuid() ||
1314 st.st_gid != getgid())
1315 return -EEXIST;
1316
1317 r = fd;
1318 fd = -1;
1319
1320 return r;
1321 }
1322
1323 static int socket_symlink(Socket *s) {
1324 const char *p;
1325 char **i;
1326
1327 assert(s);
1328
1329 p = socket_find_symlink_target(s);
1330 if (!p)
1331 return 0;
1332
1333 STRV_FOREACH(i, s->symlinks)
1334 symlink_label(p, *i);
1335
1336 return 0;
1337 }
1338
1339 static int usbffs_write_descs(int fd, Service *s) {
1340 int r;
1341
1342 if (!s->usb_function_descriptors || !s->usb_function_strings)
1343 return -EINVAL;
1344
1345 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1346 if (r < 0)
1347 return r;
1348
1349 return copy_file_fd(s->usb_function_strings, fd, 0);
1350 }
1351
1352 static int usbffs_select_ep(const struct dirent *d) {
1353 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1354 }
1355
1356 static int usbffs_dispatch_eps(SocketPort *p) {
1357 _cleanup_free_ struct dirent **ent = NULL;
1358 int r, i, n, k;
1359
1360 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1361 if (r < 0)
1362 return -errno;
1363
1364 n = r;
1365 p->auxiliary_fds = new(int, n);
1366 if (!p->auxiliary_fds)
1367 return -ENOMEM;
1368
1369 p->n_auxiliary_fds = n;
1370
1371 k = 0;
1372 for (i = 0; i < n; ++i) {
1373 _cleanup_free_ char *ep = NULL;
1374
1375 ep = path_make_absolute(ent[i]->d_name, p->path);
1376 if (!ep)
1377 return -ENOMEM;
1378
1379 path_kill_slashes(ep);
1380
1381 r = usbffs_address_create(ep);
1382 if (r < 0)
1383 goto fail;
1384
1385 p->auxiliary_fds[k] = r;
1386
1387 ++k;
1388 free(ent[i]);
1389 }
1390
1391 return r;
1392
1393 fail:
1394 close_many(p->auxiliary_fds, k);
1395 p->auxiliary_fds = mfree(p->auxiliary_fds);
1396 p->n_auxiliary_fds = 0;
1397
1398 return r;
1399 }
1400
1401 static int socket_determine_selinux_label(Socket *s, char **ret) {
1402 ExecCommand *c;
1403 int r;
1404
1405 assert(s);
1406 assert(ret);
1407
1408 if (s->selinux_context_from_net) {
1409 /* If this is requested, get label from the network label */
1410
1411 r = mac_selinux_get_our_label(ret);
1412 if (r == -EOPNOTSUPP)
1413 goto no_label;
1414
1415 } else {
1416 /* Otherwise, get it from the executable we are about to start */
1417 r = socket_instantiate_service(s);
1418 if (r < 0)
1419 return r;
1420
1421 if (!UNIT_ISSET(s->service))
1422 goto no_label;
1423
1424 c = SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START];
1425 if (!c)
1426 goto no_label;
1427
1428 r = mac_selinux_get_create_label_from_exe(c->path, ret);
1429 if (r == -EPERM || r == -EOPNOTSUPP)
1430 goto no_label;
1431 }
1432
1433 return r;
1434
1435 no_label:
1436 *ret = NULL;
1437 return 0;
1438 }
1439
1440 static int socket_open_fds(Socket *s) {
1441 _cleanup_(mac_selinux_freep) char *label = NULL;
1442 bool know_label = false;
1443 SocketPort *p;
1444 int r;
1445
1446 assert(s);
1447
1448 LIST_FOREACH(port, p, s->ports) {
1449
1450 if (p->fd >= 0)
1451 continue;
1452
1453 switch (p->type) {
1454
1455 case SOCKET_SOCKET:
1456
1457 if (!know_label) {
1458 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1459 * we need this and remember it for the rest. */
1460
1461 r = socket_determine_selinux_label(s, &label);
1462 if (r < 0)
1463 goto rollback;
1464
1465 know_label = true;
1466 }
1467
1468 /* Apply the socket protocol */
1469 switch (p->address.type) {
1470
1471 case SOCK_STREAM:
1472 case SOCK_SEQPACKET:
1473 if (s->socket_protocol == IPPROTO_SCTP)
1474 p->address.protocol = s->socket_protocol;
1475 break;
1476
1477 case SOCK_DGRAM:
1478 if (s->socket_protocol == IPPROTO_UDPLITE)
1479 p->address.protocol = s->socket_protocol;
1480 break;
1481 }
1482
1483 r = socket_address_listen(
1484 &p->address,
1485 SOCK_CLOEXEC|SOCK_NONBLOCK,
1486 s->backlog,
1487 s->bind_ipv6_only,
1488 s->bind_to_device,
1489 s->reuse_port,
1490 s->free_bind,
1491 s->transparent,
1492 s->directory_mode,
1493 s->socket_mode,
1494 label);
1495 if (r < 0)
1496 goto rollback;
1497
1498 p->fd = r;
1499 socket_apply_socket_options(s, p->fd);
1500 socket_symlink(s);
1501 break;
1502
1503 case SOCKET_SPECIAL:
1504
1505 p->fd = special_address_create(p->path, s->writable);
1506 if (p->fd < 0) {
1507 r = p->fd;
1508 goto rollback;
1509 }
1510 break;
1511
1512 case SOCKET_FIFO:
1513
1514 p->fd = fifo_address_create(
1515 p->path,
1516 s->directory_mode,
1517 s->socket_mode);
1518 if (p->fd < 0) {
1519 r = p->fd;
1520 goto rollback;
1521 }
1522
1523 socket_apply_fifo_options(s, p->fd);
1524 socket_symlink(s);
1525 break;
1526
1527 case SOCKET_MQUEUE:
1528
1529 p->fd = mq_address_create(
1530 p->path,
1531 s->socket_mode,
1532 s->mq_maxmsg,
1533 s->mq_msgsize);
1534 if (p->fd < 0) {
1535 r = p->fd;
1536 goto rollback;
1537 }
1538 break;
1539
1540 case SOCKET_USB_FUNCTION: {
1541 _cleanup_free_ char *ep = NULL;
1542
1543 ep = path_make_absolute("ep0", p->path);
1544
1545 p->fd = usbffs_address_create(ep);
1546 if (p->fd < 0) {
1547 r = p->fd;
1548 goto rollback;
1549 }
1550
1551 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1552 if (r < 0)
1553 goto rollback;
1554
1555 r = usbffs_dispatch_eps(p);
1556 if (r < 0)
1557 goto rollback;
1558
1559 break;
1560 }
1561 default:
1562 assert_not_reached("Unknown port type");
1563 }
1564 }
1565
1566 return 0;
1567
1568 rollback:
1569 socket_close_fds(s);
1570 return r;
1571 }
1572
1573 static void socket_unwatch_fds(Socket *s) {
1574 SocketPort *p;
1575 int r;
1576
1577 assert(s);
1578
1579 LIST_FOREACH(port, p, s->ports) {
1580 if (p->fd < 0)
1581 continue;
1582
1583 if (!p->event_source)
1584 continue;
1585
1586 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1587 if (r < 0)
1588 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1589 }
1590 }
1591
1592 static int socket_watch_fds(Socket *s) {
1593 SocketPort *p;
1594 int r;
1595
1596 assert(s);
1597
1598 LIST_FOREACH(port, p, s->ports) {
1599 if (p->fd < 0)
1600 continue;
1601
1602 if (p->event_source) {
1603 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1604 if (r < 0)
1605 goto fail;
1606 } else {
1607 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1608 if (r < 0)
1609 goto fail;
1610
1611 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1612 }
1613 }
1614
1615 return 0;
1616
1617 fail:
1618 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1619 socket_unwatch_fds(s);
1620 return r;
1621 }
1622
1623 enum {
1624 SOCKET_OPEN_NONE,
1625 SOCKET_OPEN_SOME,
1626 SOCKET_OPEN_ALL,
1627 };
1628
1629 static int socket_check_open(Socket *s) {
1630 bool have_open = false, have_closed = false;
1631 SocketPort *p;
1632
1633 assert(s);
1634
1635 LIST_FOREACH(port, p, s->ports) {
1636 if (p->fd < 0)
1637 have_closed = true;
1638 else
1639 have_open = true;
1640
1641 if (have_open && have_closed)
1642 return SOCKET_OPEN_SOME;
1643 }
1644
1645 if (have_open)
1646 return SOCKET_OPEN_ALL;
1647
1648 return SOCKET_OPEN_NONE;
1649 }
1650
1651 static void socket_set_state(Socket *s, SocketState state) {
1652 SocketState old_state;
1653 assert(s);
1654
1655 old_state = s->state;
1656 s->state = state;
1657
1658 if (!IN_SET(state,
1659 SOCKET_START_PRE,
1660 SOCKET_START_CHOWN,
1661 SOCKET_START_POST,
1662 SOCKET_STOP_PRE,
1663 SOCKET_STOP_PRE_SIGTERM,
1664 SOCKET_STOP_PRE_SIGKILL,
1665 SOCKET_STOP_POST,
1666 SOCKET_FINAL_SIGTERM,
1667 SOCKET_FINAL_SIGKILL)) {
1668
1669 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1670 socket_unwatch_control_pid(s);
1671 s->control_command = NULL;
1672 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1673 }
1674
1675 if (state != SOCKET_LISTENING)
1676 socket_unwatch_fds(s);
1677
1678 if (!IN_SET(state,
1679 SOCKET_START_CHOWN,
1680 SOCKET_START_POST,
1681 SOCKET_LISTENING,
1682 SOCKET_RUNNING,
1683 SOCKET_STOP_PRE,
1684 SOCKET_STOP_PRE_SIGTERM,
1685 SOCKET_STOP_PRE_SIGKILL))
1686 socket_close_fds(s);
1687
1688 if (state != old_state)
1689 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1690
1691 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1692 }
1693
1694 static int socket_coldplug(Unit *u) {
1695 Socket *s = SOCKET(u);
1696 int r;
1697
1698 assert(s);
1699 assert(s->state == SOCKET_DEAD);
1700
1701 if (s->deserialized_state == s->state)
1702 return 0;
1703
1704 if (s->control_pid > 0 &&
1705 pid_is_unwaited(s->control_pid) &&
1706 IN_SET(s->deserialized_state,
1707 SOCKET_START_PRE,
1708 SOCKET_START_CHOWN,
1709 SOCKET_START_POST,
1710 SOCKET_STOP_PRE,
1711 SOCKET_STOP_PRE_SIGTERM,
1712 SOCKET_STOP_PRE_SIGKILL,
1713 SOCKET_STOP_POST,
1714 SOCKET_FINAL_SIGTERM,
1715 SOCKET_FINAL_SIGKILL)) {
1716
1717 r = unit_watch_pid(UNIT(s), s->control_pid);
1718 if (r < 0)
1719 return r;
1720
1721 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1722 if (r < 0)
1723 return r;
1724 }
1725
1726 if (IN_SET(s->deserialized_state,
1727 SOCKET_START_CHOWN,
1728 SOCKET_START_POST,
1729 SOCKET_LISTENING,
1730 SOCKET_RUNNING)) {
1731
1732 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1733 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1734 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1735 * and if there's a mismatch, warn loudly. */
1736
1737 r = socket_check_open(s);
1738 if (r == SOCKET_OPEN_NONE)
1739 log_unit_warning(UNIT(s),
1740 "Socket unit configuration has changed while unit has been running, "
1741 "no open socket file descriptor left. "
1742 "The socket unit is not functional until restarted.");
1743 else if (r == SOCKET_OPEN_SOME)
1744 log_unit_warning(UNIT(s),
1745 "Socket unit configuration has changed while unit has been running, "
1746 "and some socket file descriptors have not been opened yet. "
1747 "The socket unit is not fully functional until restarted.");
1748 }
1749
1750 if (s->deserialized_state == SOCKET_LISTENING) {
1751 r = socket_watch_fds(s);
1752 if (r < 0)
1753 return r;
1754 }
1755
1756 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED))
1757 (void) unit_setup_dynamic_creds(u);
1758
1759 socket_set_state(s, s->deserialized_state);
1760 return 0;
1761 }
1762
1763 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1764 pid_t pid;
1765 int r;
1766 ExecParameters exec_params = {
1767 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1768 .stdin_fd = -1,
1769 .stdout_fd = -1,
1770 .stderr_fd = -1,
1771 };
1772
1773 assert(s);
1774 assert(c);
1775 assert(_pid);
1776
1777 (void) unit_realize_cgroup(UNIT(s));
1778 if (s->reset_accounting) {
1779 (void) unit_reset_cpu_accounting(UNIT(s));
1780 (void) unit_reset_ip_accounting(UNIT(s));
1781 s->reset_accounting = false;
1782 }
1783
1784 r = unit_setup_exec_runtime(UNIT(s));
1785 if (r < 0)
1786 return r;
1787
1788 r = unit_setup_dynamic_creds(UNIT(s));
1789 if (r < 0)
1790 return r;
1791
1792 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1793 if (r < 0)
1794 return r;
1795
1796 manager_set_exec_params(UNIT(s)->manager, &exec_params);
1797 unit_set_exec_params(UNIT(s), &exec_params);
1798
1799 exec_params.argv = c->argv;
1800
1801 r = exec_spawn(UNIT(s),
1802 c,
1803 &s->exec_context,
1804 &exec_params,
1805 s->exec_runtime,
1806 &s->dynamic_creds,
1807 &pid);
1808 if (r < 0)
1809 return r;
1810
1811 r = unit_watch_pid(UNIT(s), pid);
1812 if (r < 0)
1813 /* FIXME: we need to do something here */
1814 return r;
1815
1816 *_pid = pid;
1817
1818 return 0;
1819 }
1820
1821 static int socket_chown(Socket *s, pid_t *_pid) {
1822 pid_t pid;
1823 int r;
1824
1825 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1826 if (r < 0)
1827 goto fail;
1828
1829 /* We have to resolve the user names out-of-process, hence
1830 * let's fork here. It's messy, but well, what can we do? */
1831
1832 pid = fork();
1833 if (pid < 0)
1834 return -errno;
1835
1836 if (pid == 0) {
1837 SocketPort *p;
1838 uid_t uid = UID_INVALID;
1839 gid_t gid = GID_INVALID;
1840 int ret;
1841
1842 (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1);
1843 (void) ignore_signals(SIGPIPE, -1);
1844 log_forget_fds();
1845
1846 if (!isempty(s->user)) {
1847 const char *user = s->user;
1848
1849 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1850 if (r < 0) {
1851 ret = EXIT_USER;
1852 goto fail_child;
1853 }
1854 }
1855
1856 if (!isempty(s->group)) {
1857 const char *group = s->group;
1858
1859 r = get_group_creds(&group, &gid);
1860 if (r < 0) {
1861 ret = EXIT_GROUP;
1862 goto fail_child;
1863 }
1864 }
1865
1866 LIST_FOREACH(port, p, s->ports) {
1867 const char *path = NULL;
1868
1869 if (p->type == SOCKET_SOCKET)
1870 path = socket_address_get_path(&p->address);
1871 else if (p->type == SOCKET_FIFO)
1872 path = p->path;
1873
1874 if (!path)
1875 continue;
1876
1877 if (chown(path, uid, gid) < 0) {
1878 r = -errno;
1879 ret = EXIT_CHOWN;
1880 goto fail_child;
1881 }
1882 }
1883
1884 _exit(0);
1885
1886 fail_child:
1887 log_open();
1888 log_error_errno(r, "Failed to chown socket at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD));
1889
1890 _exit(ret);
1891 }
1892
1893 r = unit_watch_pid(UNIT(s), pid);
1894 if (r < 0)
1895 goto fail;
1896
1897 *_pid = pid;
1898 return 0;
1899
1900 fail:
1901 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1902 return r;
1903 }
1904
1905 static void socket_enter_dead(Socket *s, SocketResult f) {
1906 assert(s);
1907
1908 if (s->result == SOCKET_SUCCESS)
1909 s->result = f;
1910
1911 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1912
1913 exec_runtime_destroy(s->exec_runtime);
1914 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1915
1916 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1917
1918 unit_unref_uid_gid(UNIT(s), true);
1919
1920 dynamic_creds_destroy(&s->dynamic_creds);
1921 }
1922
1923 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1924
1925 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1926 int r;
1927 assert(s);
1928
1929 if (s->result == SOCKET_SUCCESS)
1930 s->result = f;
1931
1932 socket_unwatch_control_pid(s);
1933 s->control_command_id = SOCKET_EXEC_STOP_POST;
1934 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
1935
1936 if (s->control_command) {
1937 r = socket_spawn(s, s->control_command, &s->control_pid);
1938 if (r < 0)
1939 goto fail;
1940
1941 socket_set_state(s, SOCKET_STOP_POST);
1942 } else
1943 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1944
1945 return;
1946
1947 fail:
1948 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1949 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1950 }
1951
1952 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1953 int r;
1954
1955 assert(s);
1956
1957 if (s->result == SOCKET_SUCCESS)
1958 s->result = f;
1959
1960 r = unit_kill_context(
1961 UNIT(s),
1962 &s->kill_context,
1963 (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ?
1964 KILL_KILL : KILL_TERMINATE,
1965 -1,
1966 s->control_pid,
1967 false);
1968 if (r < 0)
1969 goto fail;
1970
1971 if (r > 0) {
1972 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1973 if (r < 0)
1974 goto fail;
1975
1976 socket_set_state(s, state);
1977 } else if (state == SOCKET_STOP_PRE_SIGTERM)
1978 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
1979 else if (state == SOCKET_STOP_PRE_SIGKILL)
1980 socket_enter_stop_post(s, SOCKET_SUCCESS);
1981 else if (state == SOCKET_FINAL_SIGTERM)
1982 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
1983 else
1984 socket_enter_dead(s, SOCKET_SUCCESS);
1985
1986 return;
1987
1988 fail:
1989 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1990
1991 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1992 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1993 else
1994 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1995 }
1996
1997 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1998 int r;
1999 assert(s);
2000
2001 if (s->result == SOCKET_SUCCESS)
2002 s->result = f;
2003
2004 socket_unwatch_control_pid(s);
2005 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2006 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2007
2008 if (s->control_command) {
2009 r = socket_spawn(s, s->control_command, &s->control_pid);
2010 if (r < 0)
2011 goto fail;
2012
2013 socket_set_state(s, SOCKET_STOP_PRE);
2014 } else
2015 socket_enter_stop_post(s, SOCKET_SUCCESS);
2016
2017 return;
2018
2019 fail:
2020 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2021 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2022 }
2023
2024 static void socket_enter_listening(Socket *s) {
2025 int r;
2026 assert(s);
2027
2028 r = socket_watch_fds(s);
2029 if (r < 0) {
2030 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2031 goto fail;
2032 }
2033
2034 socket_set_state(s, SOCKET_LISTENING);
2035 return;
2036
2037 fail:
2038 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2039 }
2040
2041 static void socket_enter_start_post(Socket *s) {
2042 int r;
2043 assert(s);
2044
2045 socket_unwatch_control_pid(s);
2046 s->control_command_id = SOCKET_EXEC_START_POST;
2047 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2048
2049 if (s->control_command) {
2050 r = socket_spawn(s, s->control_command, &s->control_pid);
2051 if (r < 0) {
2052 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2053 goto fail;
2054 }
2055
2056 socket_set_state(s, SOCKET_START_POST);
2057 } else
2058 socket_enter_listening(s);
2059
2060 return;
2061
2062 fail:
2063 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2064 }
2065
2066 static void socket_enter_start_chown(Socket *s) {
2067 int r;
2068
2069 assert(s);
2070
2071 r = socket_open_fds(s);
2072 if (r < 0) {
2073 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2074 goto fail;
2075 }
2076
2077 if (!isempty(s->user) || !isempty(s->group)) {
2078
2079 socket_unwatch_control_pid(s);
2080 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2081 s->control_command = NULL;
2082
2083 r = socket_chown(s, &s->control_pid);
2084 if (r < 0) {
2085 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2086 goto fail;
2087 }
2088
2089 socket_set_state(s, SOCKET_START_CHOWN);
2090 } else
2091 socket_enter_start_post(s);
2092
2093 return;
2094
2095 fail:
2096 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2097 }
2098
2099 static void socket_enter_start_pre(Socket *s) {
2100 int r;
2101 assert(s);
2102
2103 socket_unwatch_control_pid(s);
2104 s->control_command_id = SOCKET_EXEC_START_PRE;
2105 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2106
2107 if (s->control_command) {
2108 r = socket_spawn(s, s->control_command, &s->control_pid);
2109 if (r < 0) {
2110 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2111 goto fail;
2112 }
2113
2114 socket_set_state(s, SOCKET_START_PRE);
2115 } else
2116 socket_enter_start_chown(s);
2117
2118 return;
2119
2120 fail:
2121 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2122 }
2123
2124 static void flush_ports(Socket *s) {
2125 SocketPort *p;
2126
2127 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2128 * anymore */
2129
2130 LIST_FOREACH(port, p, s->ports) {
2131 if (p->fd < 0)
2132 continue;
2133
2134 (void) flush_accept(p->fd);
2135 (void) flush_fd(p->fd);
2136 }
2137 }
2138
2139 static void socket_enter_running(Socket *s, int cfd) {
2140 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2141 int r;
2142
2143 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2144 * close it. */
2145
2146 assert(s);
2147
2148 /* We don't take connections anymore if we are supposed to shut down anyway */
2149 if (unit_stop_pending(UNIT(s))) {
2150
2151 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2152
2153 if (cfd >= 0)
2154 cfd = safe_close(cfd);
2155 else
2156 flush_ports(s);
2157
2158 return;
2159 }
2160
2161 if (!ratelimit_test(&s->trigger_limit)) {
2162 safe_close(cfd);
2163 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2164 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2165 return;
2166 }
2167
2168 if (cfd < 0) {
2169 Iterator i;
2170 Unit *other;
2171 bool pending = false;
2172
2173 /* If there's already a start pending don't bother to
2174 * do anything */
2175 SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2176 if (unit_active_or_pending(other)) {
2177 pending = true;
2178 break;
2179 }
2180
2181 if (!pending) {
2182 if (!UNIT_ISSET(s->service)) {
2183 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2184 r = -ENOENT;
2185 goto fail;
2186 }
2187
2188 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2189 if (r < 0)
2190 goto fail;
2191 }
2192
2193 socket_set_state(s, SOCKET_RUNNING);
2194 } else {
2195 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2196 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2197 Service *service;
2198
2199 if (s->n_connections >= s->max_connections) {
2200 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2201 s->n_connections);
2202 safe_close(cfd);
2203 return;
2204 }
2205
2206 if (s->max_connections_per_source > 0) {
2207 r = socket_acquire_peer(s, cfd, &p);
2208 if (r < 0) {
2209 safe_close(cfd);
2210 return;
2211 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2212 _cleanup_free_ char *t = NULL;
2213
2214 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2215
2216 log_unit_warning(UNIT(s),
2217 "Too many incoming connections (%u) from source %s, dropping connection.",
2218 p->n_ref, strnull(t));
2219 safe_close(cfd);
2220 return;
2221 }
2222 }
2223
2224 r = socket_instantiate_service(s);
2225 if (r < 0)
2226 goto fail;
2227
2228 r = instance_from_socket(cfd, s->n_accepted, &instance);
2229 if (r < 0) {
2230 if (r != -ENOTCONN)
2231 goto fail;
2232
2233 /* ENOTCONN is legitimate if TCP RST was received.
2234 * This connection is over, but the socket unit lives on. */
2235 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2236 safe_close(cfd);
2237 return;
2238 }
2239
2240 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2241 if (r < 0)
2242 goto fail;
2243
2244 r = unit_name_build(prefix, instance, ".service", &name);
2245 if (r < 0)
2246 goto fail;
2247
2248 r = unit_add_name(UNIT_DEREF(s->service), name);
2249 if (r < 0)
2250 goto fail;
2251
2252 service = SERVICE(UNIT_DEREF(s->service));
2253 unit_ref_unset(&s->service);
2254
2255 s->n_accepted++;
2256 unit_choose_id(UNIT(service), name);
2257
2258 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2259 if (r < 0)
2260 goto fail;
2261
2262 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2263 s->n_connections++;
2264
2265 service->peer = p; /* Pass ownership of the peer reference */
2266 p = NULL;
2267
2268 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2269 if (r < 0) {
2270 /* We failed to activate the new service, but it still exists. Let's make sure the service
2271 * closes and forgets the connection fd again, immediately. */
2272 service_close_socket_fd(service);
2273 goto fail;
2274 }
2275
2276 /* Notify clients about changed counters */
2277 unit_add_to_dbus_queue(UNIT(s));
2278 }
2279
2280 return;
2281
2282 fail:
2283 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2284 cfd >= 0 ? "template" : "non-template",
2285 bus_error_message(&error, r));
2286
2287 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2288 safe_close(cfd);
2289 }
2290
2291 static void socket_run_next(Socket *s) {
2292 int r;
2293
2294 assert(s);
2295 assert(s->control_command);
2296 assert(s->control_command->command_next);
2297
2298 socket_unwatch_control_pid(s);
2299
2300 s->control_command = s->control_command->command_next;
2301
2302 r = socket_spawn(s, s->control_command, &s->control_pid);
2303 if (r < 0)
2304 goto fail;
2305
2306 return;
2307
2308 fail:
2309 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2310
2311 if (s->state == SOCKET_START_POST)
2312 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2313 else if (s->state == SOCKET_STOP_POST)
2314 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2315 else
2316 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2317 }
2318
2319 static int socket_start(Unit *u) {
2320 Socket *s = SOCKET(u);
2321 int r;
2322
2323 assert(s);
2324
2325 /* We cannot fulfill this request right now, try again later
2326 * please! */
2327 if (IN_SET(s->state,
2328 SOCKET_STOP_PRE,
2329 SOCKET_STOP_PRE_SIGKILL,
2330 SOCKET_STOP_PRE_SIGTERM,
2331 SOCKET_STOP_POST,
2332 SOCKET_FINAL_SIGTERM,
2333 SOCKET_FINAL_SIGKILL))
2334 return -EAGAIN;
2335
2336 /* Already on it! */
2337 if (IN_SET(s->state,
2338 SOCKET_START_PRE,
2339 SOCKET_START_CHOWN,
2340 SOCKET_START_POST))
2341 return 0;
2342
2343 /* Cannot run this without the service being around */
2344 if (UNIT_ISSET(s->service)) {
2345 Service *service;
2346
2347 service = SERVICE(UNIT_DEREF(s->service));
2348
2349 if (UNIT(service)->load_state != UNIT_LOADED) {
2350 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2351 return -ENOENT;
2352 }
2353
2354 /* If the service is already active we cannot start the
2355 * socket */
2356 if (service->state != SERVICE_DEAD &&
2357 service->state != SERVICE_FAILED &&
2358 service->state != SERVICE_AUTO_RESTART) {
2359 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2360 return -EBUSY;
2361 }
2362 }
2363
2364 assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
2365
2366 r = unit_start_limit_test(u);
2367 if (r < 0) {
2368 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2369 return r;
2370 }
2371
2372 r = unit_acquire_invocation_id(u);
2373 if (r < 0)
2374 return r;
2375
2376 s->result = SOCKET_SUCCESS;
2377 s->reset_accounting = true;
2378
2379 socket_enter_start_pre(s);
2380 return 1;
2381 }
2382
2383 static int socket_stop(Unit *u) {
2384 Socket *s = SOCKET(u);
2385
2386 assert(s);
2387
2388 /* Already on it */
2389 if (IN_SET(s->state,
2390 SOCKET_STOP_PRE,
2391 SOCKET_STOP_PRE_SIGTERM,
2392 SOCKET_STOP_PRE_SIGKILL,
2393 SOCKET_STOP_POST,
2394 SOCKET_FINAL_SIGTERM,
2395 SOCKET_FINAL_SIGKILL))
2396 return 0;
2397
2398 /* If there's already something running we go directly into
2399 * kill mode. */
2400 if (IN_SET(s->state,
2401 SOCKET_START_PRE,
2402 SOCKET_START_CHOWN,
2403 SOCKET_START_POST)) {
2404 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2405 return -EAGAIN;
2406 }
2407
2408 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
2409
2410 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2411 return 1;
2412 }
2413
2414 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2415 Socket *s = SOCKET(u);
2416 SocketPort *p;
2417 int r;
2418
2419 assert(u);
2420 assert(f);
2421 assert(fds);
2422
2423 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2424 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2425 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2426
2427 if (s->control_pid > 0)
2428 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2429
2430 if (s->control_command_id >= 0)
2431 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2432
2433 LIST_FOREACH(port, p, s->ports) {
2434 int copy;
2435
2436 if (p->fd < 0)
2437 continue;
2438
2439 copy = fdset_put_dup(fds, p->fd);
2440 if (copy < 0)
2441 return copy;
2442
2443 if (p->type == SOCKET_SOCKET) {
2444 _cleanup_free_ char *t = NULL;
2445
2446 r = socket_address_print(&p->address, &t);
2447 if (r < 0)
2448 return r;
2449
2450 if (socket_address_family(&p->address) == AF_NETLINK)
2451 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2452 else
2453 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2454
2455 } else if (p->type == SOCKET_SPECIAL)
2456 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2457 else if (p->type == SOCKET_MQUEUE)
2458 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2459 else if (p->type == SOCKET_USB_FUNCTION)
2460 unit_serialize_item_format(u, f, "ffs", "%i %s", copy, p->path);
2461 else {
2462 assert(p->type == SOCKET_FIFO);
2463 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2464 }
2465 }
2466
2467 return 0;
2468 }
2469
2470 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2471 safe_close(p->fd);
2472 p->fd = fdset_remove(fds, fd);
2473 }
2474
2475 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2476 Socket *s = SOCKET(u);
2477
2478 assert(u);
2479 assert(key);
2480 assert(value);
2481
2482 if (streq(key, "state")) {
2483 SocketState state;
2484
2485 state = socket_state_from_string(value);
2486 if (state < 0)
2487 log_unit_debug(u, "Failed to parse state value: %s", value);
2488 else
2489 s->deserialized_state = state;
2490 } else if (streq(key, "result")) {
2491 SocketResult f;
2492
2493 f = socket_result_from_string(value);
2494 if (f < 0)
2495 log_unit_debug(u, "Failed to parse result value: %s", value);
2496 else if (f != SOCKET_SUCCESS)
2497 s->result = f;
2498
2499 } else if (streq(key, "n-accepted")) {
2500 unsigned k;
2501
2502 if (safe_atou(value, &k) < 0)
2503 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2504 else
2505 s->n_accepted += k;
2506 } else if (streq(key, "control-pid")) {
2507 pid_t pid;
2508
2509 if (parse_pid(value, &pid) < 0)
2510 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2511 else
2512 s->control_pid = pid;
2513 } else if (streq(key, "control-command")) {
2514 SocketExecCommand id;
2515
2516 id = socket_exec_command_from_string(value);
2517 if (id < 0)
2518 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2519 else {
2520 s->control_command_id = id;
2521 s->control_command = s->exec_command[id];
2522 }
2523 } else if (streq(key, "fifo")) {
2524 int fd, skip = 0;
2525 SocketPort *p;
2526
2527 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2528 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2529 else
2530 LIST_FOREACH(port, p, s->ports)
2531 if (p->type == SOCKET_FIFO &&
2532 path_equal_or_files_same(p->path, value+skip, 0)) {
2533 socket_port_take_fd(p, fds, fd);
2534 break;
2535 }
2536
2537 } else if (streq(key, "special")) {
2538 int fd, skip = 0;
2539 SocketPort *p;
2540
2541 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2542 log_unit_debug(u, "Failed to parse special value: %s", value);
2543 else
2544 LIST_FOREACH(port, p, s->ports)
2545 if (p->type == SOCKET_SPECIAL &&
2546 path_equal_or_files_same(p->path, value+skip, 0)) {
2547 socket_port_take_fd(p, fds, fd);
2548 break;
2549 }
2550
2551 } else if (streq(key, "mqueue")) {
2552 int fd, skip = 0;
2553 SocketPort *p;
2554
2555 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2556 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2557 else
2558 LIST_FOREACH(port, p, s->ports)
2559 if (p->type == SOCKET_MQUEUE &&
2560 streq(p->path, value+skip)) {
2561 socket_port_take_fd(p, fds, fd);
2562 break;
2563 }
2564
2565 } else if (streq(key, "socket")) {
2566 int fd, type, skip = 0;
2567 SocketPort *p;
2568
2569 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2570 log_unit_debug(u, "Failed to parse socket value: %s", value);
2571 else
2572 LIST_FOREACH(port, p, s->ports)
2573 if (socket_address_is(&p->address, value+skip, type)) {
2574 socket_port_take_fd(p, fds, fd);
2575 break;
2576 }
2577
2578 } else if (streq(key, "netlink")) {
2579 int fd, skip = 0;
2580 SocketPort *p;
2581
2582 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2583 log_unit_debug(u, "Failed to parse socket value: %s", value);
2584 else
2585 LIST_FOREACH(port, p, s->ports)
2586 if (socket_address_is_netlink(&p->address, value+skip)) {
2587 socket_port_take_fd(p, fds, fd);
2588 break;
2589 }
2590
2591 } else if (streq(key, "ffs")) {
2592 int fd, skip = 0;
2593 SocketPort *p;
2594
2595 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2596 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2597 else
2598 LIST_FOREACH(port, p, s->ports)
2599 if (p->type == SOCKET_USB_FUNCTION &&
2600 path_equal_or_files_same(p->path, value+skip, 0)) {
2601 socket_port_take_fd(p, fds, fd);
2602 break;
2603 }
2604
2605 } else
2606 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2607
2608 return 0;
2609 }
2610
2611 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2612 Socket *s = SOCKET(u);
2613 SocketPort *p;
2614
2615 assert(u);
2616
2617 LIST_FOREACH(port, p, s->ports) {
2618 Iterator i;
2619 int fd;
2620
2621 if (p->type != SOCKET_SOCKET)
2622 continue;
2623
2624 if (p->fd >= 0)
2625 continue;
2626
2627 FDSET_FOREACH(fd, fds, i) {
2628 if (socket_address_matches_fd(&p->address, fd)) {
2629 p->fd = fdset_remove(fds, fd);
2630 s->deserialized_state = SOCKET_LISTENING;
2631 break;
2632 }
2633 }
2634 }
2635 }
2636
2637 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2638 assert(u);
2639
2640 return state_translation_table[SOCKET(u)->state];
2641 }
2642
2643 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2644 assert(u);
2645
2646 return socket_state_to_string(SOCKET(u)->state);
2647 }
2648
2649 const char* socket_port_type_to_string(SocketPort *p) {
2650
2651 assert(p);
2652
2653 switch (p->type) {
2654
2655 case SOCKET_SOCKET:
2656
2657 switch (p->address.type) {
2658
2659 case SOCK_STREAM:
2660 return "Stream";
2661
2662 case SOCK_DGRAM:
2663 return "Datagram";
2664
2665 case SOCK_SEQPACKET:
2666 return "SequentialPacket";
2667
2668 case SOCK_RAW:
2669 if (socket_address_family(&p->address) == AF_NETLINK)
2670 return "Netlink";
2671
2672 /* fall through */
2673 default:
2674 return NULL;
2675 }
2676
2677 case SOCKET_SPECIAL:
2678 return "Special";
2679
2680 case SOCKET_MQUEUE:
2681 return "MessageQueue";
2682
2683 case SOCKET_FIFO:
2684 return "FIFO";
2685
2686 case SOCKET_USB_FUNCTION:
2687 return "USBFunction";
2688
2689 default:
2690 return NULL;
2691 }
2692 }
2693
2694 _pure_ static bool socket_check_gc(Unit *u) {
2695 Socket *s = SOCKET(u);
2696
2697 assert(u);
2698
2699 return s->n_connections > 0;
2700 }
2701
2702 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2703 SocketPort *p = userdata;
2704 int cfd = -1;
2705
2706 assert(p);
2707 assert(fd >= 0);
2708
2709 if (p->socket->state != SOCKET_LISTENING)
2710 return 0;
2711
2712 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2713
2714 if (revents != EPOLLIN) {
2715
2716 if (revents & EPOLLHUP)
2717 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.");
2718 else
2719 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2720 goto fail;
2721 }
2722
2723 if (p->socket->accept &&
2724 p->type == SOCKET_SOCKET &&
2725 socket_address_can_accept(&p->address)) {
2726
2727 for (;;) {
2728
2729 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2730 if (cfd < 0) {
2731
2732 if (errno == EINTR)
2733 continue;
2734
2735 log_unit_error_errno(UNIT(p->socket), errno, "Failed to accept socket: %m");
2736 goto fail;
2737 }
2738
2739 break;
2740 }
2741
2742 socket_apply_socket_options(p->socket, cfd);
2743 }
2744
2745 socket_enter_running(p->socket, cfd);
2746 return 0;
2747
2748 fail:
2749 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2750 return 0;
2751 }
2752
2753 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2754 Socket *s = SOCKET(u);
2755 SocketResult f;
2756
2757 assert(s);
2758 assert(pid >= 0);
2759
2760 if (pid != s->control_pid)
2761 return;
2762
2763 s->control_pid = 0;
2764
2765 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2766 f = SOCKET_SUCCESS;
2767 else if (code == CLD_EXITED)
2768 f = SOCKET_FAILURE_EXIT_CODE;
2769 else if (code == CLD_KILLED)
2770 f = SOCKET_FAILURE_SIGNAL;
2771 else if (code == CLD_DUMPED)
2772 f = SOCKET_FAILURE_CORE_DUMP;
2773 else
2774 assert_not_reached("Unknown sigchld code");
2775
2776 if (s->control_command) {
2777 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2778
2779 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2780 f = SOCKET_SUCCESS;
2781 }
2782
2783 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2784 "Control process exited, code=%s status=%i",
2785 sigchld_code_to_string(code), status);
2786
2787 if (s->result == SOCKET_SUCCESS)
2788 s->result = f;
2789
2790 if (s->control_command &&
2791 s->control_command->command_next &&
2792 f == SOCKET_SUCCESS) {
2793
2794 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2795 socket_run_next(s);
2796 } else {
2797 s->control_command = NULL;
2798 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2799
2800 /* No further commands for this step, so let's figure
2801 * out what to do next */
2802
2803 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2804
2805 switch (s->state) {
2806
2807 case SOCKET_START_PRE:
2808 if (f == SOCKET_SUCCESS)
2809 socket_enter_start_chown(s);
2810 else
2811 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2812 break;
2813
2814 case SOCKET_START_CHOWN:
2815 if (f == SOCKET_SUCCESS)
2816 socket_enter_start_post(s);
2817 else
2818 socket_enter_stop_pre(s, f);
2819 break;
2820
2821 case SOCKET_START_POST:
2822 if (f == SOCKET_SUCCESS)
2823 socket_enter_listening(s);
2824 else
2825 socket_enter_stop_pre(s, f);
2826 break;
2827
2828 case SOCKET_STOP_PRE:
2829 case SOCKET_STOP_PRE_SIGTERM:
2830 case SOCKET_STOP_PRE_SIGKILL:
2831 socket_enter_stop_post(s, f);
2832 break;
2833
2834 case SOCKET_STOP_POST:
2835 case SOCKET_FINAL_SIGTERM:
2836 case SOCKET_FINAL_SIGKILL:
2837 socket_enter_dead(s, f);
2838 break;
2839
2840 default:
2841 assert_not_reached("Uh, control process died at wrong time.");
2842 }
2843 }
2844
2845 /* Notify clients about changed exit status */
2846 unit_add_to_dbus_queue(u);
2847 }
2848
2849 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
2850 Socket *s = SOCKET(userdata);
2851
2852 assert(s);
2853 assert(s->timer_event_source == source);
2854
2855 switch (s->state) {
2856
2857 case SOCKET_START_PRE:
2858 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
2859 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2860 break;
2861
2862 case SOCKET_START_CHOWN:
2863 case SOCKET_START_POST:
2864 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
2865 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
2866 break;
2867
2868 case SOCKET_STOP_PRE:
2869 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
2870 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2871 break;
2872
2873 case SOCKET_STOP_PRE_SIGTERM:
2874 if (s->kill_context.send_sigkill) {
2875 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
2876 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2877 } else {
2878 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
2879 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2880 }
2881 break;
2882
2883 case SOCKET_STOP_PRE_SIGKILL:
2884 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
2885 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2886 break;
2887
2888 case SOCKET_STOP_POST:
2889 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
2890 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2891 break;
2892
2893 case SOCKET_FINAL_SIGTERM:
2894 if (s->kill_context.send_sigkill) {
2895 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
2896 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2897 } else {
2898 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
2899 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2900 }
2901 break;
2902
2903 case SOCKET_FINAL_SIGKILL:
2904 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
2905 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2906 break;
2907
2908 default:
2909 assert_not_reached("Timeout at wrong time.");
2910 }
2911
2912 return 0;
2913 }
2914
2915 int socket_collect_fds(Socket *s, int **fds) {
2916 int *rfds, k = 0, n = 0;
2917 SocketPort *p;
2918
2919 assert(s);
2920 assert(fds);
2921
2922 /* Called from the service code for requesting our fds */
2923
2924 LIST_FOREACH(port, p, s->ports) {
2925 if (p->fd >= 0)
2926 n++;
2927 n += p->n_auxiliary_fds;
2928 }
2929
2930 if (n <= 0) {
2931 *fds = NULL;
2932 return 0;
2933 }
2934
2935 rfds = new(int, n);
2936 if (!rfds)
2937 return -ENOMEM;
2938
2939 LIST_FOREACH(port, p, s->ports) {
2940 int i;
2941
2942 if (p->fd >= 0)
2943 rfds[k++] = p->fd;
2944 for (i = 0; i < p->n_auxiliary_fds; ++i)
2945 rfds[k++] = p->auxiliary_fds[i];
2946 }
2947
2948 assert(k == n);
2949
2950 *fds = rfds;
2951 return n;
2952 }
2953
2954 static void socket_reset_failed(Unit *u) {
2955 Socket *s = SOCKET(u);
2956
2957 assert(s);
2958
2959 if (s->state == SOCKET_FAILED)
2960 socket_set_state(s, SOCKET_DEAD);
2961
2962 s->result = SOCKET_SUCCESS;
2963 }
2964
2965 void socket_connection_unref(Socket *s) {
2966 assert(s);
2967
2968 /* The service is dead. Yay!
2969 *
2970 * This is strictly for one-instance-per-connection
2971 * services. */
2972
2973 assert(s->n_connections > 0);
2974 s->n_connections--;
2975
2976 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
2977 }
2978
2979 static void socket_trigger_notify(Unit *u, Unit *other) {
2980 Socket *s = SOCKET(u);
2981
2982 assert(u);
2983 assert(other);
2984
2985 /* Filter out invocations with bogus state */
2986 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
2987 return;
2988
2989 /* Don't propagate state changes from the service if we are already down */
2990 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
2991 return;
2992
2993 /* We don't care for the service state if we are in Accept=yes mode */
2994 if (s->accept)
2995 return;
2996
2997 /* Propagate start limit hit state */
2998 if (other->start_limit_hit) {
2999 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3000 return;
3001 }
3002
3003 /* Don't propagate anything if there's still a job queued */
3004 if (other->job)
3005 return;
3006
3007 if (IN_SET(SERVICE(other)->state,
3008 SERVICE_DEAD, SERVICE_FAILED,
3009 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3010 SERVICE_AUTO_RESTART))
3011 socket_enter_listening(s);
3012
3013 if (SERVICE(other)->state == SERVICE_RUNNING)
3014 socket_set_state(s, SOCKET_RUNNING);
3015 }
3016
3017 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3018 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3019 }
3020
3021 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3022 Socket *s = SOCKET(u);
3023 usec_t t;
3024 int r;
3025
3026 if (!s->timer_event_source)
3027 return 0;
3028
3029 r = sd_event_source_get_time(s->timer_event_source, &t);
3030 if (r < 0)
3031 return r;
3032 if (t == USEC_INFINITY)
3033 return 0;
3034
3035 *timeout = t;
3036 return 1;
3037 }
3038
3039 char *socket_fdname(Socket *s) {
3040 assert(s);
3041
3042 /* Returns the name to use for $LISTEN_NAMES. If the user
3043 * didn't specify anything specifically, use the socket unit's
3044 * name as fallback. */
3045
3046 if (s->fdname)
3047 return s->fdname;
3048
3049 return UNIT(s)->id;
3050 }
3051
3052 static int socket_control_pid(Unit *u) {
3053 Socket *s = SOCKET(u);
3054
3055 assert(s);
3056
3057 return s->control_pid;
3058 }
3059
3060 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3061 [SOCKET_EXEC_START_PRE] = "StartPre",
3062 [SOCKET_EXEC_START_CHOWN] = "StartChown",
3063 [SOCKET_EXEC_START_POST] = "StartPost",
3064 [SOCKET_EXEC_STOP_PRE] = "StopPre",
3065 [SOCKET_EXEC_STOP_POST] = "StopPost"
3066 };
3067
3068 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3069
3070 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3071 [SOCKET_SUCCESS] = "success",
3072 [SOCKET_FAILURE_RESOURCES] = "resources",
3073 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3074 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3075 [SOCKET_FAILURE_SIGNAL] = "signal",
3076 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3077 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3078 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3079 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3080 };
3081
3082 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3083
3084 const UnitVTable socket_vtable = {
3085 .object_size = sizeof(Socket),
3086 .exec_context_offset = offsetof(Socket, exec_context),
3087 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3088 .kill_context_offset = offsetof(Socket, kill_context),
3089 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3090 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3091
3092 .sections =
3093 "Unit\0"
3094 "Socket\0"
3095 "Install\0",
3096 .private_section = "Socket",
3097
3098 .init = socket_init,
3099 .done = socket_done,
3100 .load = socket_load,
3101
3102 .coldplug = socket_coldplug,
3103
3104 .dump = socket_dump,
3105
3106 .start = socket_start,
3107 .stop = socket_stop,
3108
3109 .kill = socket_kill,
3110
3111 .get_timeout = socket_get_timeout,
3112
3113 .serialize = socket_serialize,
3114 .deserialize_item = socket_deserialize_item,
3115 .distribute_fds = socket_distribute_fds,
3116
3117 .active_state = socket_active_state,
3118 .sub_state_to_string = socket_sub_state_to_string,
3119
3120 .check_gc = socket_check_gc,
3121
3122 .sigchld_event = socket_sigchld_event,
3123
3124 .trigger_notify = socket_trigger_notify,
3125
3126 .reset_failed = socket_reset_failed,
3127
3128 .control_pid = socket_control_pid,
3129
3130 .bus_vtable = bus_socket_vtable,
3131 .bus_set_property = bus_socket_set_property,
3132 .bus_commit_properties = bus_socket_commit_properties,
3133
3134 .status_message_formats = {
3135 /*.starting_stopping = {
3136 [0] = "Starting socket %s...",
3137 [1] = "Stopping socket %s...",
3138 },*/
3139 .finished_start_job = {
3140 [JOB_DONE] = "Listening on %s.",
3141 [JOB_FAILED] = "Failed to listen on %s.",
3142 [JOB_TIMEOUT] = "Timed out starting %s.",
3143 },
3144 .finished_stop_job = {
3145 [JOB_DONE] = "Closed %s.",
3146 [JOB_FAILED] = "Failed stopping %s.",
3147 [JOB_TIMEOUT] = "Timed out stopping %s.",
3148 },
3149 },
3150 };
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