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socket: make sure we warn loudly about symlinks we can't create
[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 "bpf-firewall.h"
33 #include "bus-error.h"
34 #include "bus-util.h"
35 #include "copy.h"
36 #include "dbus-socket.h"
37 #include "def.h"
38 #include "exit-status.h"
39 #include "fd-util.h"
40 #include "format-util.h"
41 #include "fs-util.h"
42 #include "in-addr-util.h"
43 #include "io-util.h"
44 #include "label.h"
45 #include "log.h"
46 #include "missing.h"
47 #include "mkdir.h"
48 #include "parse-util.h"
49 #include "path-util.h"
50 #include "process-util.h"
51 #include "selinux-util.h"
52 #include "signal-util.h"
53 #include "smack-util.h"
54 #include "socket.h"
55 #include "special.h"
56 #include "string-table.h"
57 #include "string-util.h"
58 #include "strv.h"
59 #include "unit-name.h"
60 #include "unit.h"
61 #include "user-util.h"
62
63 struct SocketPeer {
64 unsigned n_ref;
65
66 Socket *socket;
67 union sockaddr_union peer;
68 socklen_t peer_salen;
69 };
70
71 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
72 [SOCKET_DEAD] = UNIT_INACTIVE,
73 [SOCKET_START_PRE] = UNIT_ACTIVATING,
74 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
75 [SOCKET_START_POST] = UNIT_ACTIVATING,
76 [SOCKET_LISTENING] = UNIT_ACTIVE,
77 [SOCKET_RUNNING] = UNIT_ACTIVE,
78 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
79 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
80 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
81 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
82 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
83 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
84 [SOCKET_FAILED] = UNIT_FAILED
85 };
86
87 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
88 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
89
90 static void socket_init(Unit *u) {
91 Socket *s = SOCKET(u);
92
93 assert(u);
94 assert(u->load_state == UNIT_STUB);
95
96 s->backlog = SOMAXCONN;
97 s->timeout_usec = u->manager->default_timeout_start_usec;
98 s->directory_mode = 0755;
99 s->socket_mode = 0666;
100
101 s->max_connections = 64;
102
103 s->priority = -1;
104 s->ip_tos = -1;
105 s->ip_ttl = -1;
106 s->mark = -1;
107
108 s->exec_context.std_output = u->manager->default_std_output;
109 s->exec_context.std_error = u->manager->default_std_error;
110
111 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
112
113 s->trigger_limit.interval = USEC_INFINITY;
114 s->trigger_limit.burst = (unsigned) -1;
115 }
116
117 static void socket_unwatch_control_pid(Socket *s) {
118 assert(s);
119
120 if (s->control_pid <= 0)
121 return;
122
123 unit_unwatch_pid(UNIT(s), s->control_pid);
124 s->control_pid = 0;
125 }
126
127 static void socket_cleanup_fd_list(SocketPort *p) {
128 assert(p);
129
130 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
131 p->auxiliary_fds = mfree(p->auxiliary_fds);
132 p->n_auxiliary_fds = 0;
133 }
134
135 void socket_free_ports(Socket *s) {
136 SocketPort *p;
137
138 assert(s);
139
140 while ((p = s->ports)) {
141 LIST_REMOVE(port, s->ports, p);
142
143 sd_event_source_unref(p->event_source);
144
145 socket_cleanup_fd_list(p);
146 safe_close(p->fd);
147 free(p->path);
148 free(p);
149 }
150 }
151
152 static void socket_done(Unit *u) {
153 Socket *s = SOCKET(u);
154 SocketPeer *p;
155
156 assert(s);
157
158 socket_free_ports(s);
159
160 while ((p = set_steal_first(s->peers_by_address)))
161 p->socket = NULL;
162
163 s->peers_by_address = set_free(s->peers_by_address);
164
165 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
166 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
167 s->control_command = NULL;
168
169 dynamic_creds_unref(&s->dynamic_creds);
170
171 socket_unwatch_control_pid(s);
172
173 unit_ref_unset(&s->service);
174
175 s->tcp_congestion = mfree(s->tcp_congestion);
176 s->bind_to_device = mfree(s->bind_to_device);
177
178 s->smack = mfree(s->smack);
179 s->smack_ip_in = mfree(s->smack_ip_in);
180 s->smack_ip_out = mfree(s->smack_ip_out);
181
182 strv_free(s->symlinks);
183
184 s->user = mfree(s->user);
185 s->group = mfree(s->group);
186
187 s->fdname = mfree(s->fdname);
188
189 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
190 }
191
192 static int socket_arm_timer(Socket *s, usec_t usec) {
193 int r;
194
195 assert(s);
196
197 if (s->timer_event_source) {
198 r = sd_event_source_set_time(s->timer_event_source, usec);
199 if (r < 0)
200 return r;
201
202 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
203 }
204
205 if (usec == USEC_INFINITY)
206 return 0;
207
208 r = sd_event_add_time(
209 UNIT(s)->manager->event,
210 &s->timer_event_source,
211 CLOCK_MONOTONIC,
212 usec, 0,
213 socket_dispatch_timer, s);
214 if (r < 0)
215 return r;
216
217 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
218
219 return 0;
220 }
221
222 int socket_instantiate_service(Socket *s) {
223 _cleanup_free_ char *prefix = NULL, *name = NULL;
224 int r;
225 Unit *u;
226
227 assert(s);
228
229 /* This fills in s->service if it isn't filled in yet. For
230 * Accept=yes sockets we create the next connection service
231 * here. For Accept=no this is mostly a NOP since the service
232 * is figured out at load time anyway. */
233
234 if (UNIT_DEREF(s->service))
235 return 0;
236
237 if (!s->accept)
238 return 0;
239
240 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
241 if (r < 0)
242 return r;
243
244 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
245 return -ENOMEM;
246
247 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
248 if (r < 0)
249 return r;
250
251 unit_ref_set(&s->service, u);
252
253 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
254 }
255
256 static bool have_non_accept_socket(Socket *s) {
257 SocketPort *p;
258
259 assert(s);
260
261 if (!s->accept)
262 return true;
263
264 LIST_FOREACH(port, p, s->ports) {
265
266 if (p->type != SOCKET_SOCKET)
267 return true;
268
269 if (!socket_address_can_accept(&p->address))
270 return true;
271 }
272
273 return false;
274 }
275
276 static int socket_add_mount_links(Socket *s) {
277 SocketPort *p;
278 int r;
279
280 assert(s);
281
282 LIST_FOREACH(port, p, s->ports) {
283 const char *path = NULL;
284
285 if (p->type == SOCKET_SOCKET)
286 path = socket_address_get_path(&p->address);
287 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
288 path = p->path;
289
290 if (!path)
291 continue;
292
293 r = unit_require_mounts_for(UNIT(s), path);
294 if (r < 0)
295 return r;
296 }
297
298 return 0;
299 }
300
301 static int socket_add_device_link(Socket *s) {
302 char *t;
303
304 assert(s);
305
306 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
307 return 0;
308
309 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
310 return unit_add_node_link(UNIT(s), t, false, UNIT_BINDS_TO);
311 }
312
313 static int socket_add_default_dependencies(Socket *s) {
314 int r;
315 assert(s);
316
317 if (!UNIT(s)->default_dependencies)
318 return 0;
319
320 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true);
321 if (r < 0)
322 return r;
323
324 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
325 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
326 if (r < 0)
327 return r;
328 }
329
330 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
331 }
332
333 _pure_ static bool socket_has_exec(Socket *s) {
334 unsigned i;
335 assert(s);
336
337 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
338 if (s->exec_command[i])
339 return true;
340
341 return false;
342 }
343
344 static int socket_add_extras(Socket *s) {
345 Unit *u = UNIT(s);
346 int r;
347
348 assert(s);
349
350 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
351 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
352 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
353 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
354 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
355 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
356 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
357 * service starts are typical. */
358
359 if (s->trigger_limit.interval == USEC_INFINITY)
360 s->trigger_limit.interval = 2 * USEC_PER_SEC;
361
362 if (s->trigger_limit.burst == (unsigned) -1) {
363 if (s->accept)
364 s->trigger_limit.burst = 200;
365 else
366 s->trigger_limit.burst = 20;
367 }
368
369 if (have_non_accept_socket(s)) {
370
371 if (!UNIT_DEREF(s->service)) {
372 Unit *x;
373
374 r = unit_load_related_unit(u, ".service", &x);
375 if (r < 0)
376 return r;
377
378 unit_ref_set(&s->service, x);
379 }
380
381 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
382 if (r < 0)
383 return r;
384 }
385
386 r = socket_add_mount_links(s);
387 if (r < 0)
388 return r;
389
390 r = socket_add_device_link(s);
391 if (r < 0)
392 return r;
393
394 r = unit_patch_contexts(u);
395 if (r < 0)
396 return r;
397
398 if (socket_has_exec(s)) {
399 r = unit_add_exec_dependencies(u, &s->exec_context);
400 if (r < 0)
401 return r;
402 }
403
404 r = unit_set_default_slice(u);
405 if (r < 0)
406 return r;
407
408 r = socket_add_default_dependencies(s);
409 if (r < 0)
410 return r;
411
412 return 0;
413 }
414
415 static const char *socket_find_symlink_target(Socket *s) {
416 const char *found = NULL;
417 SocketPort *p;
418
419 LIST_FOREACH(port, p, s->ports) {
420 const char *f = NULL;
421
422 switch (p->type) {
423
424 case SOCKET_FIFO:
425 f = p->path;
426 break;
427
428 case SOCKET_SOCKET:
429 f = socket_address_get_path(&p->address);
430 break;
431
432 default:
433 break;
434 }
435
436 if (f) {
437 if (found)
438 return NULL;
439
440 found = f;
441 }
442 }
443
444 return found;
445 }
446
447 static int socket_verify(Socket *s) {
448 assert(s);
449
450 if (UNIT(s)->load_state != UNIT_LOADED)
451 return 0;
452
453 if (!s->ports) {
454 log_unit_error(UNIT(s), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
455 return -EINVAL;
456 }
457
458 if (s->accept && have_non_accept_socket(s)) {
459 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
460 return -EINVAL;
461 }
462
463 if (s->accept && s->max_connections <= 0) {
464 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
465 return -EINVAL;
466 }
467
468 if (s->accept && UNIT_DEREF(s->service)) {
469 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
470 return -EINVAL;
471 }
472
473 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
474 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
475 return -EINVAL;
476 }
477
478 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
479 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
480 return -EINVAL;
481 }
482
483 return 0;
484 }
485
486 static void peer_address_hash_func(const void *p, struct siphash *state) {
487 const SocketPeer *s = p;
488
489 assert(s);
490
491 if (s->peer.sa.sa_family == AF_INET)
492 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
493 else if (s->peer.sa.sa_family == AF_INET6)
494 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
495 else if (s->peer.sa.sa_family == AF_VSOCK)
496 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
497 else
498 assert_not_reached("Unknown address family.");
499 }
500
501 static int peer_address_compare_func(const void *a, const void *b) {
502 const SocketPeer *x = a, *y = b;
503
504 if (x->peer.sa.sa_family < y->peer.sa.sa_family)
505 return -1;
506 if (x->peer.sa.sa_family > y->peer.sa.sa_family)
507 return 1;
508
509 switch(x->peer.sa.sa_family) {
510 case AF_INET:
511 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
512 case AF_INET6:
513 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
514 case AF_VSOCK:
515 if (x->peer.vm.svm_cid < y->peer.vm.svm_cid)
516 return -1;
517 if (x->peer.vm.svm_cid > y->peer.vm.svm_cid)
518 return 1;
519 return 0;
520 }
521 assert_not_reached("Black sheep in the family!");
522 }
523
524 const struct hash_ops peer_address_hash_ops = {
525 .hash = peer_address_hash_func,
526 .compare = peer_address_compare_func
527 };
528
529 static int socket_load(Unit *u) {
530 Socket *s = SOCKET(u);
531 int r;
532
533 assert(u);
534 assert(u->load_state == UNIT_STUB);
535
536 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
537 if (r < 0)
538 return r;
539
540 r = unit_load_fragment_and_dropin(u);
541 if (r < 0)
542 return r;
543
544 if (u->load_state == UNIT_LOADED) {
545 /* This is a new unit? Then let's add in some extras */
546 r = socket_add_extras(s);
547 if (r < 0)
548 return r;
549 }
550
551 return socket_verify(s);
552 }
553
554 static SocketPeer *socket_peer_new(void) {
555 SocketPeer *p;
556
557 p = new0(SocketPeer, 1);
558 if (!p)
559 return NULL;
560
561 p->n_ref = 1;
562
563 return p;
564 }
565
566 SocketPeer *socket_peer_ref(SocketPeer *p) {
567 if (!p)
568 return NULL;
569
570 assert(p->n_ref > 0);
571 p->n_ref++;
572
573 return p;
574 }
575
576 SocketPeer *socket_peer_unref(SocketPeer *p) {
577 if (!p)
578 return NULL;
579
580 assert(p->n_ref > 0);
581
582 p->n_ref--;
583
584 if (p->n_ref > 0)
585 return NULL;
586
587 if (p->socket)
588 set_remove(p->socket->peers_by_address, p);
589
590 return mfree(p);
591 }
592
593 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
594 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
595 SocketPeer sa = {}, *i;
596 socklen_t salen = sizeof(sa.peer);
597 int r;
598
599 assert(fd >= 0);
600 assert(s);
601
602 r = getpeername(fd, &sa.peer.sa, &salen);
603 if (r < 0)
604 return log_error_errno(errno, "getpeername failed: %m");
605
606 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
607 *p = NULL;
608 return 0;
609 }
610
611 i = set_get(s->peers_by_address, &sa);
612 if (i) {
613 *p = socket_peer_ref(i);
614 return 1;
615 }
616
617 remote = socket_peer_new();
618 if (!remote)
619 return log_oom();
620
621 remote->peer = sa.peer;
622 remote->peer_salen = salen;
623
624 r = set_put(s->peers_by_address, remote);
625 if (r < 0)
626 return r;
627
628 remote->socket = s;
629
630 *p = remote;
631 remote = NULL;
632
633 return 1;
634 }
635
636 _const_ static const char* listen_lookup(int family, int type) {
637
638 if (family == AF_NETLINK)
639 return "ListenNetlink";
640
641 if (type == SOCK_STREAM)
642 return "ListenStream";
643 else if (type == SOCK_DGRAM)
644 return "ListenDatagram";
645 else if (type == SOCK_SEQPACKET)
646 return "ListenSequentialPacket";
647
648 assert_not_reached("Unknown socket type");
649 return NULL;
650 }
651
652 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
653 char time_string[FORMAT_TIMESPAN_MAX];
654 SocketExecCommand c;
655 Socket *s = SOCKET(u);
656 SocketPort *p;
657 const char *prefix2;
658
659 assert(s);
660 assert(f);
661
662 prefix = strempty(prefix);
663 prefix2 = strjoina(prefix, "\t");
664
665 fprintf(f,
666 "%sSocket State: %s\n"
667 "%sResult: %s\n"
668 "%sBindIPv6Only: %s\n"
669 "%sBacklog: %u\n"
670 "%sSocketMode: %04o\n"
671 "%sDirectoryMode: %04o\n"
672 "%sKeepAlive: %s\n"
673 "%sNoDelay: %s\n"
674 "%sFreeBind: %s\n"
675 "%sTransparent: %s\n"
676 "%sBroadcast: %s\n"
677 "%sPassCredentials: %s\n"
678 "%sPassSecurity: %s\n"
679 "%sTCPCongestion: %s\n"
680 "%sRemoveOnStop: %s\n"
681 "%sWritable: %s\n"
682 "%sFDName: %s\n"
683 "%sSELinuxContextFromNet: %s\n",
684 prefix, socket_state_to_string(s->state),
685 prefix, socket_result_to_string(s->result),
686 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
687 prefix, s->backlog,
688 prefix, s->socket_mode,
689 prefix, s->directory_mode,
690 prefix, yes_no(s->keep_alive),
691 prefix, yes_no(s->no_delay),
692 prefix, yes_no(s->free_bind),
693 prefix, yes_no(s->transparent),
694 prefix, yes_no(s->broadcast),
695 prefix, yes_no(s->pass_cred),
696 prefix, yes_no(s->pass_sec),
697 prefix, strna(s->tcp_congestion),
698 prefix, yes_no(s->remove_on_stop),
699 prefix, yes_no(s->writable),
700 prefix, socket_fdname(s),
701 prefix, yes_no(s->selinux_context_from_net));
702
703 if (s->control_pid > 0)
704 fprintf(f,
705 "%sControl PID: "PID_FMT"\n",
706 prefix, s->control_pid);
707
708 if (s->bind_to_device)
709 fprintf(f,
710 "%sBindToDevice: %s\n",
711 prefix, s->bind_to_device);
712
713 if (s->accept)
714 fprintf(f,
715 "%sAccepted: %u\n"
716 "%sNConnections: %u\n"
717 "%sMaxConnections: %u\n",
718 prefix, s->n_accepted,
719 prefix, s->n_connections,
720 prefix, s->max_connections);
721
722 if (s->priority >= 0)
723 fprintf(f,
724 "%sPriority: %i\n",
725 prefix, s->priority);
726
727 if (s->receive_buffer > 0)
728 fprintf(f,
729 "%sReceiveBuffer: %zu\n",
730 prefix, s->receive_buffer);
731
732 if (s->send_buffer > 0)
733 fprintf(f,
734 "%sSendBuffer: %zu\n",
735 prefix, s->send_buffer);
736
737 if (s->ip_tos >= 0)
738 fprintf(f,
739 "%sIPTOS: %i\n",
740 prefix, s->ip_tos);
741
742 if (s->ip_ttl >= 0)
743 fprintf(f,
744 "%sIPTTL: %i\n",
745 prefix, s->ip_ttl);
746
747 if (s->pipe_size > 0)
748 fprintf(f,
749 "%sPipeSize: %zu\n",
750 prefix, s->pipe_size);
751
752 if (s->mark >= 0)
753 fprintf(f,
754 "%sMark: %i\n",
755 prefix, s->mark);
756
757 if (s->mq_maxmsg > 0)
758 fprintf(f,
759 "%sMessageQueueMaxMessages: %li\n",
760 prefix, s->mq_maxmsg);
761
762 if (s->mq_msgsize > 0)
763 fprintf(f,
764 "%sMessageQueueMessageSize: %li\n",
765 prefix, s->mq_msgsize);
766
767 if (s->reuse_port)
768 fprintf(f,
769 "%sReusePort: %s\n",
770 prefix, yes_no(s->reuse_port));
771
772 if (s->smack)
773 fprintf(f,
774 "%sSmackLabel: %s\n",
775 prefix, s->smack);
776
777 if (s->smack_ip_in)
778 fprintf(f,
779 "%sSmackLabelIPIn: %s\n",
780 prefix, s->smack_ip_in);
781
782 if (s->smack_ip_out)
783 fprintf(f,
784 "%sSmackLabelIPOut: %s\n",
785 prefix, s->smack_ip_out);
786
787 if (!isempty(s->user) || !isempty(s->group))
788 fprintf(f,
789 "%sSocketUser: %s\n"
790 "%sSocketGroup: %s\n",
791 prefix, strna(s->user),
792 prefix, strna(s->group));
793
794 if (s->keep_alive_time > 0)
795 fprintf(f,
796 "%sKeepAliveTimeSec: %s\n",
797 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
798
799 if (s->keep_alive_interval)
800 fprintf(f,
801 "%sKeepAliveIntervalSec: %s\n",
802 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
803
804 if (s->keep_alive_cnt)
805 fprintf(f,
806 "%sKeepAliveProbes: %u\n",
807 prefix, s->keep_alive_cnt);
808
809 if (s->defer_accept)
810 fprintf(f,
811 "%sDeferAcceptSec: %s\n",
812 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
813
814 LIST_FOREACH(port, p, s->ports) {
815
816 if (p->type == SOCKET_SOCKET) {
817 const char *t;
818 int r;
819 char *k = NULL;
820
821 r = socket_address_print(&p->address, &k);
822 if (r < 0)
823 t = strerror(-r);
824 else
825 t = k;
826
827 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
828 free(k);
829 } else if (p->type == SOCKET_SPECIAL)
830 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
831 else if (p->type == SOCKET_USB_FUNCTION)
832 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
833 else if (p->type == SOCKET_MQUEUE)
834 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
835 else
836 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
837 }
838
839 fprintf(f,
840 "%sTriggerLimitIntervalSec: %s\n"
841 "%sTriggerLimitBurst: %u\n",
842 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
843 prefix, s->trigger_limit.burst);
844
845 exec_context_dump(&s->exec_context, f, prefix);
846 kill_context_dump(&s->kill_context, f, prefix);
847
848 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
849 if (!s->exec_command[c])
850 continue;
851
852 fprintf(f, "%s-> %s:\n",
853 prefix, socket_exec_command_to_string(c));
854
855 exec_command_dump_list(s->exec_command[c], f, prefix2);
856 }
857
858 cgroup_context_dump(&s->cgroup_context, f, prefix);
859 }
860
861 static int instance_from_socket(int fd, unsigned nr, char **instance) {
862 socklen_t l;
863 char *r;
864 union sockaddr_union local, remote;
865
866 assert(fd >= 0);
867 assert(instance);
868
869 l = sizeof(local);
870 if (getsockname(fd, &local.sa, &l) < 0)
871 return -errno;
872
873 l = sizeof(remote);
874 if (getpeername(fd, &remote.sa, &l) < 0)
875 return -errno;
876
877 switch (local.sa.sa_family) {
878
879 case AF_INET: {
880 uint32_t
881 a = be32toh(local.in.sin_addr.s_addr),
882 b = be32toh(remote.in.sin_addr.s_addr);
883
884 if (asprintf(&r,
885 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
886 nr,
887 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
888 be16toh(local.in.sin_port),
889 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
890 be16toh(remote.in.sin_port)) < 0)
891 return -ENOMEM;
892
893 break;
894 }
895
896 case AF_INET6: {
897 static const unsigned char ipv4_prefix[] = {
898 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
899 };
900
901 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
902 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
903 const uint8_t
904 *a = local.in6.sin6_addr.s6_addr+12,
905 *b = remote.in6.sin6_addr.s6_addr+12;
906
907 if (asprintf(&r,
908 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
909 nr,
910 a[0], a[1], a[2], a[3],
911 be16toh(local.in6.sin6_port),
912 b[0], b[1], b[2], b[3],
913 be16toh(remote.in6.sin6_port)) < 0)
914 return -ENOMEM;
915 } else {
916 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
917
918 if (asprintf(&r,
919 "%u-%s:%u-%s:%u",
920 nr,
921 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
922 be16toh(local.in6.sin6_port),
923 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
924 be16toh(remote.in6.sin6_port)) < 0)
925 return -ENOMEM;
926 }
927
928 break;
929 }
930
931 case AF_UNIX: {
932 struct ucred ucred;
933 int k;
934
935 k = getpeercred(fd, &ucred);
936 if (k >= 0) {
937 if (asprintf(&r,
938 "%u-"PID_FMT"-"UID_FMT,
939 nr, ucred.pid, ucred.uid) < 0)
940 return -ENOMEM;
941 } else if (k == -ENODATA) {
942 /* This handles the case where somebody is
943 * connecting from another pid/uid namespace
944 * (e.g. from outside of our container). */
945 if (asprintf(&r,
946 "%u-unknown",
947 nr) < 0)
948 return -ENOMEM;
949 } else
950 return k;
951
952 break;
953 }
954
955 case AF_VSOCK:
956 if (asprintf(&r,
957 "%u-%u:%u-%u:%u",
958 nr,
959 local.vm.svm_cid, local.vm.svm_port,
960 remote.vm.svm_cid, remote.vm.svm_port) < 0)
961 return -ENOMEM;
962
963 break;
964
965 default:
966 assert_not_reached("Unhandled socket type.");
967 }
968
969 *instance = r;
970 return 0;
971 }
972
973 static void socket_close_fds(Socket *s) {
974 SocketPort *p;
975 char **i;
976
977 assert(s);
978
979 LIST_FOREACH(port, p, s->ports) {
980 bool was_open;
981
982 was_open = p->fd >= 0;
983
984 p->event_source = sd_event_source_unref(p->event_source);
985 p->fd = safe_close(p->fd);
986 socket_cleanup_fd_list(p);
987
988 /* One little note: we should normally not delete any sockets in the file system here! After all some
989 * other process we spawned might still have a reference of this fd and wants to continue to use
990 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
991 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
992 * anyway, but only then. */
993
994 if (!was_open || !s->remove_on_stop)
995 continue;
996
997 switch (p->type) {
998
999 case SOCKET_FIFO:
1000 (void) unlink(p->path);
1001 break;
1002
1003 case SOCKET_MQUEUE:
1004 (void) mq_unlink(p->path);
1005 break;
1006
1007 case SOCKET_SOCKET:
1008 (void) socket_address_unlink(&p->address);
1009 break;
1010
1011 default:
1012 break;
1013 }
1014 }
1015
1016 if (s->remove_on_stop)
1017 STRV_FOREACH(i, s->symlinks)
1018 (void) unlink(*i);
1019 }
1020
1021 static void socket_apply_socket_options(Socket *s, int fd) {
1022 int r;
1023
1024 assert(s);
1025 assert(fd >= 0);
1026
1027 if (s->keep_alive) {
1028 int b = s->keep_alive;
1029 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
1030 log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
1031 }
1032
1033 if (s->keep_alive_time) {
1034 int value = s->keep_alive_time / USEC_PER_SEC;
1035 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
1036 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m");
1037 }
1038
1039 if (s->keep_alive_interval) {
1040 int value = s->keep_alive_interval / USEC_PER_SEC;
1041 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
1042 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m");
1043 }
1044
1045 if (s->keep_alive_cnt) {
1046 int value = s->keep_alive_cnt;
1047 if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
1048 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
1049 }
1050
1051 if (s->defer_accept) {
1052 int value = s->defer_accept / USEC_PER_SEC;
1053 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
1054 log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m");
1055 }
1056
1057 if (s->no_delay) {
1058 int b = s->no_delay;
1059
1060 if (s->socket_protocol == IPPROTO_SCTP) {
1061 if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &b, sizeof(b)) < 0)
1062 log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
1063 } else {
1064 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
1065 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
1066 }
1067 }
1068
1069 if (s->broadcast) {
1070 int one = 1;
1071 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
1072 log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
1073 }
1074
1075 if (s->pass_cred) {
1076 int one = 1;
1077 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
1078 log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
1079 }
1080
1081 if (s->pass_sec) {
1082 int one = 1;
1083 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
1084 log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
1085 }
1086
1087 if (s->priority >= 0)
1088 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
1089 log_unit_warning_errno(UNIT(s), errno, "SO_PRIORITY failed: %m");
1090
1091 if (s->receive_buffer > 0) {
1092 int value = (int) s->receive_buffer;
1093
1094 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
1095
1096 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
1097 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
1098 log_unit_warning_errno(UNIT(s), errno, "SO_RCVBUF failed: %m");
1099 }
1100
1101 if (s->send_buffer > 0) {
1102 int value = (int) s->send_buffer;
1103 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
1104 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
1105 log_unit_warning_errno(UNIT(s), errno, "SO_SNDBUF failed: %m");
1106 }
1107
1108 if (s->mark >= 0)
1109 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
1110 log_unit_warning_errno(UNIT(s), errno, "SO_MARK failed: %m");
1111
1112 if (s->ip_tos >= 0)
1113 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
1114 log_unit_warning_errno(UNIT(s), errno, "IP_TOS failed: %m");
1115
1116 if (s->ip_ttl >= 0) {
1117 int x;
1118
1119 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
1120
1121 if (socket_ipv6_is_supported())
1122 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
1123 else {
1124 x = -1;
1125 errno = EAFNOSUPPORT;
1126 }
1127
1128 if (r < 0 && x < 0)
1129 log_unit_warning_errno(UNIT(s), errno, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1130 }
1131
1132 if (s->tcp_congestion)
1133 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1134 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1135
1136 if (s->smack_ip_in) {
1137 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1138 if (r < 0)
1139 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1140 }
1141
1142 if (s->smack_ip_out) {
1143 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1144 if (r < 0)
1145 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1146 }
1147 }
1148
1149 static void socket_apply_fifo_options(Socket *s, int fd) {
1150 int r;
1151
1152 assert(s);
1153 assert(fd >= 0);
1154
1155 if (s->pipe_size > 0)
1156 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1157 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1158
1159 if (s->smack) {
1160 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1161 if (r < 0)
1162 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1163 }
1164 }
1165
1166 static int fifo_address_create(
1167 const char *path,
1168 mode_t directory_mode,
1169 mode_t socket_mode) {
1170
1171 _cleanup_close_ int fd = -1;
1172 mode_t old_mask;
1173 struct stat st;
1174 int r;
1175
1176 assert(path);
1177
1178 mkdir_parents_label(path, directory_mode);
1179
1180 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1181 if (r < 0)
1182 return r;
1183
1184 /* Enforce the right access mode for the fifo */
1185 old_mask = umask(~ socket_mode);
1186
1187 /* Include the original umask in our mask */
1188 (void) umask(~socket_mode | old_mask);
1189
1190 r = mkfifo(path, socket_mode);
1191 (void) umask(old_mask);
1192
1193 if (r < 0 && errno != EEXIST) {
1194 r = -errno;
1195 goto fail;
1196 }
1197
1198 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1199 if (fd < 0) {
1200 r = -errno;
1201 goto fail;
1202 }
1203
1204 mac_selinux_create_file_clear();
1205
1206 if (fstat(fd, &st) < 0) {
1207 r = -errno;
1208 goto fail;
1209 }
1210
1211 if (!S_ISFIFO(st.st_mode) ||
1212 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1213 st.st_uid != getuid() ||
1214 st.st_gid != getgid()) {
1215 r = -EEXIST;
1216 goto fail;
1217 }
1218
1219 r = fd;
1220 fd = -1;
1221
1222 return r;
1223
1224 fail:
1225 mac_selinux_create_file_clear();
1226 return r;
1227 }
1228
1229 static int special_address_create(const char *path, bool writable) {
1230 _cleanup_close_ int fd = -1;
1231 struct stat st;
1232 int r;
1233
1234 assert(path);
1235
1236 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1237 if (fd < 0)
1238 return -errno;
1239
1240 if (fstat(fd, &st) < 0)
1241 return -errno;
1242
1243 /* Check whether this is a /proc, /sys or /dev file or char device */
1244 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1245 return -EEXIST;
1246
1247 r = fd;
1248 fd = -1;
1249
1250 return r;
1251 }
1252
1253 static int usbffs_address_create(const char *path) {
1254 _cleanup_close_ int fd = -1;
1255 struct stat st;
1256 int r;
1257
1258 assert(path);
1259
1260 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1261 if (fd < 0)
1262 return -errno;
1263
1264 if (fstat(fd, &st) < 0)
1265 return -errno;
1266
1267 /* Check whether this is a regular file (ffs endpoint) */
1268 if (!S_ISREG(st.st_mode))
1269 return -EEXIST;
1270
1271 r = fd;
1272 fd = -1;
1273
1274 return r;
1275 }
1276
1277 static int mq_address_create(
1278 const char *path,
1279 mode_t mq_mode,
1280 long maxmsg,
1281 long msgsize) {
1282
1283 _cleanup_close_ int fd = -1;
1284 struct stat st;
1285 mode_t old_mask;
1286 struct mq_attr _attr, *attr = NULL;
1287 int r;
1288
1289 assert(path);
1290
1291 if (maxmsg > 0 && msgsize > 0) {
1292 _attr = (struct mq_attr) {
1293 .mq_flags = O_NONBLOCK,
1294 .mq_maxmsg = maxmsg,
1295 .mq_msgsize = msgsize,
1296 };
1297 attr = &_attr;
1298 }
1299
1300 /* Enforce the right access mode for the mq */
1301 old_mask = umask(~ mq_mode);
1302
1303 /* Include the original umask in our mask */
1304 (void) umask(~mq_mode | old_mask);
1305 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1306 (void) umask(old_mask);
1307
1308 if (fd < 0)
1309 return -errno;
1310
1311 if (fstat(fd, &st) < 0)
1312 return -errno;
1313
1314 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1315 st.st_uid != getuid() ||
1316 st.st_gid != getgid())
1317 return -EEXIST;
1318
1319 r = fd;
1320 fd = -1;
1321
1322 return r;
1323 }
1324
1325 static int socket_symlink(Socket *s) {
1326 const char *p;
1327 char **i;
1328 int r;
1329
1330 assert(s);
1331
1332 p = socket_find_symlink_target(s);
1333 if (!p)
1334 return 0;
1335
1336 STRV_FOREACH(i, s->symlinks) {
1337 r = symlink_idempotent(p, *i);
1338 if (r < 0)
1339 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1340 }
1341
1342 return 0;
1343 }
1344
1345 static int usbffs_write_descs(int fd, Service *s) {
1346 int r;
1347
1348 if (!s->usb_function_descriptors || !s->usb_function_strings)
1349 return -EINVAL;
1350
1351 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1352 if (r < 0)
1353 return r;
1354
1355 return copy_file_fd(s->usb_function_strings, fd, 0);
1356 }
1357
1358 static int usbffs_select_ep(const struct dirent *d) {
1359 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1360 }
1361
1362 static int usbffs_dispatch_eps(SocketPort *p) {
1363 _cleanup_free_ struct dirent **ent = NULL;
1364 int r, i, n, k;
1365
1366 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1367 if (r < 0)
1368 return -errno;
1369
1370 n = r;
1371 p->auxiliary_fds = new(int, n);
1372 if (!p->auxiliary_fds)
1373 return -ENOMEM;
1374
1375 p->n_auxiliary_fds = n;
1376
1377 k = 0;
1378 for (i = 0; i < n; ++i) {
1379 _cleanup_free_ char *ep = NULL;
1380
1381 ep = path_make_absolute(ent[i]->d_name, p->path);
1382 if (!ep)
1383 return -ENOMEM;
1384
1385 path_kill_slashes(ep);
1386
1387 r = usbffs_address_create(ep);
1388 if (r < 0)
1389 goto fail;
1390
1391 p->auxiliary_fds[k] = r;
1392
1393 ++k;
1394 free(ent[i]);
1395 }
1396
1397 return r;
1398
1399 fail:
1400 close_many(p->auxiliary_fds, k);
1401 p->auxiliary_fds = mfree(p->auxiliary_fds);
1402 p->n_auxiliary_fds = 0;
1403
1404 return r;
1405 }
1406
1407 static int socket_determine_selinux_label(Socket *s, char **ret) {
1408 ExecCommand *c;
1409 int r;
1410
1411 assert(s);
1412 assert(ret);
1413
1414 if (s->selinux_context_from_net) {
1415 /* If this is requested, get label from the network label */
1416
1417 r = mac_selinux_get_our_label(ret);
1418 if (r == -EOPNOTSUPP)
1419 goto no_label;
1420
1421 } else {
1422 /* Otherwise, get it from the executable we are about to start */
1423 r = socket_instantiate_service(s);
1424 if (r < 0)
1425 return r;
1426
1427 if (!UNIT_ISSET(s->service))
1428 goto no_label;
1429
1430 c = SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START];
1431 if (!c)
1432 goto no_label;
1433
1434 r = mac_selinux_get_create_label_from_exe(c->path, ret);
1435 if (r == -EPERM || r == -EOPNOTSUPP)
1436 goto no_label;
1437 }
1438
1439 return r;
1440
1441 no_label:
1442 *ret = NULL;
1443 return 0;
1444 }
1445
1446 static int socket_address_listen_do(
1447 Socket *s,
1448 const SocketAddress *address,
1449 const char *label) {
1450
1451 assert(s);
1452 assert(address);
1453
1454 return socket_address_listen(
1455 address,
1456 SOCK_CLOEXEC|SOCK_NONBLOCK,
1457 s->backlog,
1458 s->bind_ipv6_only,
1459 s->bind_to_device,
1460 s->reuse_port,
1461 s->free_bind,
1462 s->transparent,
1463 s->directory_mode,
1464 s->socket_mode,
1465 label);
1466 }
1467
1468 static int socket_address_listen_in_cgroup(
1469 Socket *s,
1470 const SocketAddress *address,
1471 const char *label) {
1472
1473 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1474 int fd, r;
1475 pid_t pid;
1476
1477 assert(s);
1478 assert(address);
1479
1480 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1481 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1482 * unit's cgroup for the purpose of BPF filtering and such. */
1483
1484 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1485 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1486
1487 r = bpf_firewall_supported();
1488 if (r < 0)
1489 return r;
1490 if (r == 0) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1491 goto shortcut;
1492
1493 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1494 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1495
1496 r = unit_fork_helper_process(UNIT(s), &pid);
1497 if (r < 0)
1498 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1499 if (r == 0) {
1500 /* Child */
1501
1502 pair[0] = safe_close(pair[0]);
1503
1504 fd = socket_address_listen_do(s, address, label);
1505 if (fd < 0) {
1506 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1507 _exit(EXIT_FAILURE);
1508 }
1509
1510 r = send_one_fd(pair[1], fd, 0);
1511 if (r < 0) {
1512 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1513 _exit(EXIT_FAILURE);
1514 }
1515
1516 _exit(EXIT_SUCCESS);
1517 }
1518
1519 pair[1] = safe_close(pair[1]);
1520 fd = receive_one_fd(pair[0], 0);
1521
1522 /* We synchronously wait for the helper, as it shouldn't be slow */
1523 r = wait_for_terminate_and_warn("listen-cgroup-helper", pid, false);
1524 if (r < 0) {
1525 safe_close(fd);
1526 return r;
1527 }
1528
1529 if (fd < 0)
1530 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1531
1532 return fd;
1533
1534 shortcut:
1535 fd = socket_address_listen_do(s, address, label);
1536 if (fd < 0)
1537 return log_error_errno(fd, "Failed to create listening socket: %m");
1538
1539 return fd;
1540 }
1541
1542 static int socket_open_fds(Socket *s) {
1543 _cleanup_(mac_selinux_freep) char *label = NULL;
1544 bool know_label = false;
1545 SocketPort *p;
1546 int r;
1547
1548 assert(s);
1549
1550 LIST_FOREACH(port, p, s->ports) {
1551
1552 if (p->fd >= 0)
1553 continue;
1554
1555 switch (p->type) {
1556
1557 case SOCKET_SOCKET:
1558
1559 if (!know_label) {
1560 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1561 * we need this and remember it for the rest. */
1562
1563 r = socket_determine_selinux_label(s, &label);
1564 if (r < 0)
1565 goto rollback;
1566
1567 know_label = true;
1568 }
1569
1570 /* Apply the socket protocol */
1571 switch (p->address.type) {
1572
1573 case SOCK_STREAM:
1574 case SOCK_SEQPACKET:
1575 if (s->socket_protocol == IPPROTO_SCTP)
1576 p->address.protocol = s->socket_protocol;
1577 break;
1578
1579 case SOCK_DGRAM:
1580 if (s->socket_protocol == IPPROTO_UDPLITE)
1581 p->address.protocol = s->socket_protocol;
1582 break;
1583 }
1584
1585 r = socket_address_listen_in_cgroup(s, &p->address, label);
1586 if (r < 0)
1587 goto rollback;
1588
1589 p->fd = r;
1590 socket_apply_socket_options(s, p->fd);
1591 socket_symlink(s);
1592 break;
1593
1594 case SOCKET_SPECIAL:
1595
1596 p->fd = special_address_create(p->path, s->writable);
1597 if (p->fd < 0) {
1598 r = p->fd;
1599 goto rollback;
1600 }
1601 break;
1602
1603 case SOCKET_FIFO:
1604
1605 p->fd = fifo_address_create(
1606 p->path,
1607 s->directory_mode,
1608 s->socket_mode);
1609 if (p->fd < 0) {
1610 r = p->fd;
1611 goto rollback;
1612 }
1613
1614 socket_apply_fifo_options(s, p->fd);
1615 socket_symlink(s);
1616 break;
1617
1618 case SOCKET_MQUEUE:
1619
1620 p->fd = mq_address_create(
1621 p->path,
1622 s->socket_mode,
1623 s->mq_maxmsg,
1624 s->mq_msgsize);
1625 if (p->fd < 0) {
1626 r = p->fd;
1627 goto rollback;
1628 }
1629 break;
1630
1631 case SOCKET_USB_FUNCTION: {
1632 _cleanup_free_ char *ep = NULL;
1633
1634 ep = path_make_absolute("ep0", p->path);
1635
1636 p->fd = usbffs_address_create(ep);
1637 if (p->fd < 0) {
1638 r = p->fd;
1639 goto rollback;
1640 }
1641
1642 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1643 if (r < 0)
1644 goto rollback;
1645
1646 r = usbffs_dispatch_eps(p);
1647 if (r < 0)
1648 goto rollback;
1649
1650 break;
1651 }
1652 default:
1653 assert_not_reached("Unknown port type");
1654 }
1655 }
1656
1657 return 0;
1658
1659 rollback:
1660 socket_close_fds(s);
1661 return r;
1662 }
1663
1664 static void socket_unwatch_fds(Socket *s) {
1665 SocketPort *p;
1666 int r;
1667
1668 assert(s);
1669
1670 LIST_FOREACH(port, p, s->ports) {
1671 if (p->fd < 0)
1672 continue;
1673
1674 if (!p->event_source)
1675 continue;
1676
1677 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1678 if (r < 0)
1679 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1680 }
1681 }
1682
1683 static int socket_watch_fds(Socket *s) {
1684 SocketPort *p;
1685 int r;
1686
1687 assert(s);
1688
1689 LIST_FOREACH(port, p, s->ports) {
1690 if (p->fd < 0)
1691 continue;
1692
1693 if (p->event_source) {
1694 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1695 if (r < 0)
1696 goto fail;
1697 } else {
1698 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1699 if (r < 0)
1700 goto fail;
1701
1702 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1703 }
1704 }
1705
1706 return 0;
1707
1708 fail:
1709 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1710 socket_unwatch_fds(s);
1711 return r;
1712 }
1713
1714 enum {
1715 SOCKET_OPEN_NONE,
1716 SOCKET_OPEN_SOME,
1717 SOCKET_OPEN_ALL,
1718 };
1719
1720 static int socket_check_open(Socket *s) {
1721 bool have_open = false, have_closed = false;
1722 SocketPort *p;
1723
1724 assert(s);
1725
1726 LIST_FOREACH(port, p, s->ports) {
1727 if (p->fd < 0)
1728 have_closed = true;
1729 else
1730 have_open = true;
1731
1732 if (have_open && have_closed)
1733 return SOCKET_OPEN_SOME;
1734 }
1735
1736 if (have_open)
1737 return SOCKET_OPEN_ALL;
1738
1739 return SOCKET_OPEN_NONE;
1740 }
1741
1742 static void socket_set_state(Socket *s, SocketState state) {
1743 SocketState old_state;
1744 assert(s);
1745
1746 old_state = s->state;
1747 s->state = state;
1748
1749 if (!IN_SET(state,
1750 SOCKET_START_PRE,
1751 SOCKET_START_CHOWN,
1752 SOCKET_START_POST,
1753 SOCKET_STOP_PRE,
1754 SOCKET_STOP_PRE_SIGTERM,
1755 SOCKET_STOP_PRE_SIGKILL,
1756 SOCKET_STOP_POST,
1757 SOCKET_FINAL_SIGTERM,
1758 SOCKET_FINAL_SIGKILL)) {
1759
1760 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1761 socket_unwatch_control_pid(s);
1762 s->control_command = NULL;
1763 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1764 }
1765
1766 if (state != SOCKET_LISTENING)
1767 socket_unwatch_fds(s);
1768
1769 if (!IN_SET(state,
1770 SOCKET_START_CHOWN,
1771 SOCKET_START_POST,
1772 SOCKET_LISTENING,
1773 SOCKET_RUNNING,
1774 SOCKET_STOP_PRE,
1775 SOCKET_STOP_PRE_SIGTERM,
1776 SOCKET_STOP_PRE_SIGKILL))
1777 socket_close_fds(s);
1778
1779 if (state != old_state)
1780 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1781
1782 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1783 }
1784
1785 static int socket_coldplug(Unit *u) {
1786 Socket *s = SOCKET(u);
1787 int r;
1788
1789 assert(s);
1790 assert(s->state == SOCKET_DEAD);
1791
1792 if (s->deserialized_state == s->state)
1793 return 0;
1794
1795 if (s->control_pid > 0 &&
1796 pid_is_unwaited(s->control_pid) &&
1797 IN_SET(s->deserialized_state,
1798 SOCKET_START_PRE,
1799 SOCKET_START_CHOWN,
1800 SOCKET_START_POST,
1801 SOCKET_STOP_PRE,
1802 SOCKET_STOP_PRE_SIGTERM,
1803 SOCKET_STOP_PRE_SIGKILL,
1804 SOCKET_STOP_POST,
1805 SOCKET_FINAL_SIGTERM,
1806 SOCKET_FINAL_SIGKILL)) {
1807
1808 r = unit_watch_pid(UNIT(s), s->control_pid);
1809 if (r < 0)
1810 return r;
1811
1812 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1813 if (r < 0)
1814 return r;
1815 }
1816
1817 if (IN_SET(s->deserialized_state,
1818 SOCKET_START_CHOWN,
1819 SOCKET_START_POST,
1820 SOCKET_LISTENING,
1821 SOCKET_RUNNING)) {
1822
1823 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1824 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1825 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1826 * and if there's a mismatch, warn loudly. */
1827
1828 r = socket_check_open(s);
1829 if (r == SOCKET_OPEN_NONE)
1830 log_unit_warning(UNIT(s),
1831 "Socket unit configuration has changed while unit has been running, "
1832 "no open socket file descriptor left. "
1833 "The socket unit is not functional until restarted.");
1834 else if (r == SOCKET_OPEN_SOME)
1835 log_unit_warning(UNIT(s),
1836 "Socket unit configuration has changed while unit has been running, "
1837 "and some socket file descriptors have not been opened yet. "
1838 "The socket unit is not fully functional until restarted.");
1839 }
1840
1841 if (s->deserialized_state == SOCKET_LISTENING) {
1842 r = socket_watch_fds(s);
1843 if (r < 0)
1844 return r;
1845 }
1846
1847 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED))
1848 (void) unit_setup_dynamic_creds(u);
1849
1850 socket_set_state(s, s->deserialized_state);
1851 return 0;
1852 }
1853
1854 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1855 pid_t pid;
1856 int r;
1857 ExecParameters exec_params = {
1858 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1859 .stdin_fd = -1,
1860 .stdout_fd = -1,
1861 .stderr_fd = -1,
1862 };
1863
1864 assert(s);
1865 assert(c);
1866 assert(_pid);
1867
1868 (void) unit_realize_cgroup(UNIT(s));
1869 if (s->reset_accounting) {
1870 (void) unit_reset_cpu_accounting(UNIT(s));
1871 (void) unit_reset_ip_accounting(UNIT(s));
1872 s->reset_accounting = false;
1873 }
1874
1875 r = unit_setup_exec_runtime(UNIT(s));
1876 if (r < 0)
1877 return r;
1878
1879 r = unit_setup_dynamic_creds(UNIT(s));
1880 if (r < 0)
1881 return r;
1882
1883 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1884 if (r < 0)
1885 return r;
1886
1887 manager_set_exec_params(UNIT(s)->manager, &exec_params);
1888 unit_set_exec_params(UNIT(s), &exec_params);
1889
1890 exec_params.argv = c->argv;
1891
1892 r = exec_spawn(UNIT(s),
1893 c,
1894 &s->exec_context,
1895 &exec_params,
1896 s->exec_runtime,
1897 &s->dynamic_creds,
1898 &pid);
1899 if (r < 0)
1900 return r;
1901
1902 r = unit_watch_pid(UNIT(s), pid);
1903 if (r < 0)
1904 /* FIXME: we need to do something here */
1905 return r;
1906
1907 *_pid = pid;
1908
1909 return 0;
1910 }
1911
1912 static int socket_chown(Socket *s, pid_t *_pid) {
1913 pid_t pid;
1914 int r;
1915
1916 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1917 if (r < 0)
1918 goto fail;
1919
1920 /* We have to resolve the user names out-of-process, hence
1921 * let's fork here. It's messy, but well, what can we do? */
1922
1923 r = unit_fork_helper_process(UNIT(s), &pid);
1924 if (r < 0)
1925 return r;
1926 if (r == 0) {
1927 uid_t uid = UID_INVALID;
1928 gid_t gid = GID_INVALID;
1929 SocketPort *p;
1930
1931 /* Child */
1932
1933 if (!isempty(s->user)) {
1934 const char *user = s->user;
1935
1936 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1937 if (r < 0) {
1938 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1939 _exit(EXIT_USER);
1940 }
1941 }
1942
1943 if (!isempty(s->group)) {
1944 const char *group = s->group;
1945
1946 r = get_group_creds(&group, &gid);
1947 if (r < 0) {
1948 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1949 _exit(EXIT_GROUP);
1950 }
1951 }
1952
1953 LIST_FOREACH(port, p, s->ports) {
1954 const char *path = NULL;
1955
1956 if (p->type == SOCKET_SOCKET)
1957 path = socket_address_get_path(&p->address);
1958 else if (p->type == SOCKET_FIFO)
1959 path = p->path;
1960
1961 if (!path)
1962 continue;
1963
1964 if (chown(path, uid, gid) < 0) {
1965 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1966 _exit(EXIT_CHOWN);
1967 }
1968 }
1969
1970 _exit(EXIT_SUCCESS);
1971 }
1972
1973 r = unit_watch_pid(UNIT(s), pid);
1974 if (r < 0)
1975 goto fail;
1976
1977 *_pid = pid;
1978 return 0;
1979
1980 fail:
1981 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1982 return r;
1983 }
1984
1985 static void socket_enter_dead(Socket *s, SocketResult f) {
1986 assert(s);
1987
1988 if (s->result == SOCKET_SUCCESS)
1989 s->result = f;
1990
1991 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1992
1993 exec_runtime_destroy(s->exec_runtime);
1994 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1995
1996 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1997
1998 unit_unref_uid_gid(UNIT(s), true);
1999
2000 dynamic_creds_destroy(&s->dynamic_creds);
2001 }
2002
2003 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2004
2005 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2006 int r;
2007 assert(s);
2008
2009 if (s->result == SOCKET_SUCCESS)
2010 s->result = f;
2011
2012 socket_unwatch_control_pid(s);
2013 s->control_command_id = SOCKET_EXEC_STOP_POST;
2014 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2015
2016 if (s->control_command) {
2017 r = socket_spawn(s, s->control_command, &s->control_pid);
2018 if (r < 0)
2019 goto fail;
2020
2021 socket_set_state(s, SOCKET_STOP_POST);
2022 } else
2023 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2024
2025 return;
2026
2027 fail:
2028 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2029 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2030 }
2031
2032 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2033 int r;
2034
2035 assert(s);
2036
2037 if (s->result == SOCKET_SUCCESS)
2038 s->result = f;
2039
2040 r = unit_kill_context(
2041 UNIT(s),
2042 &s->kill_context,
2043 (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ?
2044 KILL_KILL : KILL_TERMINATE,
2045 -1,
2046 s->control_pid,
2047 false);
2048 if (r < 0)
2049 goto fail;
2050
2051 if (r > 0) {
2052 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2053 if (r < 0)
2054 goto fail;
2055
2056 socket_set_state(s, state);
2057 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2058 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2059 else if (state == SOCKET_STOP_PRE_SIGKILL)
2060 socket_enter_stop_post(s, SOCKET_SUCCESS);
2061 else if (state == SOCKET_FINAL_SIGTERM)
2062 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2063 else
2064 socket_enter_dead(s, SOCKET_SUCCESS);
2065
2066 return;
2067
2068 fail:
2069 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2070
2071 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
2072 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2073 else
2074 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2075 }
2076
2077 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2078 int r;
2079 assert(s);
2080
2081 if (s->result == SOCKET_SUCCESS)
2082 s->result = f;
2083
2084 socket_unwatch_control_pid(s);
2085 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2086 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2087
2088 if (s->control_command) {
2089 r = socket_spawn(s, s->control_command, &s->control_pid);
2090 if (r < 0)
2091 goto fail;
2092
2093 socket_set_state(s, SOCKET_STOP_PRE);
2094 } else
2095 socket_enter_stop_post(s, SOCKET_SUCCESS);
2096
2097 return;
2098
2099 fail:
2100 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2101 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2102 }
2103
2104 static void socket_enter_listening(Socket *s) {
2105 int r;
2106 assert(s);
2107
2108 r = socket_watch_fds(s);
2109 if (r < 0) {
2110 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2111 goto fail;
2112 }
2113
2114 socket_set_state(s, SOCKET_LISTENING);
2115 return;
2116
2117 fail:
2118 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2119 }
2120
2121 static void socket_enter_start_post(Socket *s) {
2122 int r;
2123 assert(s);
2124
2125 socket_unwatch_control_pid(s);
2126 s->control_command_id = SOCKET_EXEC_START_POST;
2127 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2128
2129 if (s->control_command) {
2130 r = socket_spawn(s, s->control_command, &s->control_pid);
2131 if (r < 0) {
2132 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2133 goto fail;
2134 }
2135
2136 socket_set_state(s, SOCKET_START_POST);
2137 } else
2138 socket_enter_listening(s);
2139
2140 return;
2141
2142 fail:
2143 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2144 }
2145
2146 static void socket_enter_start_chown(Socket *s) {
2147 int r;
2148
2149 assert(s);
2150
2151 r = socket_open_fds(s);
2152 if (r < 0) {
2153 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2154 goto fail;
2155 }
2156
2157 if (!isempty(s->user) || !isempty(s->group)) {
2158
2159 socket_unwatch_control_pid(s);
2160 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2161 s->control_command = NULL;
2162
2163 r = socket_chown(s, &s->control_pid);
2164 if (r < 0) {
2165 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2166 goto fail;
2167 }
2168
2169 socket_set_state(s, SOCKET_START_CHOWN);
2170 } else
2171 socket_enter_start_post(s);
2172
2173 return;
2174
2175 fail:
2176 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2177 }
2178
2179 static void socket_enter_start_pre(Socket *s) {
2180 int r;
2181 assert(s);
2182
2183 socket_unwatch_control_pid(s);
2184 s->control_command_id = SOCKET_EXEC_START_PRE;
2185 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2186
2187 if (s->control_command) {
2188 r = socket_spawn(s, s->control_command, &s->control_pid);
2189 if (r < 0) {
2190 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2191 goto fail;
2192 }
2193
2194 socket_set_state(s, SOCKET_START_PRE);
2195 } else
2196 socket_enter_start_chown(s);
2197
2198 return;
2199
2200 fail:
2201 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2202 }
2203
2204 static void flush_ports(Socket *s) {
2205 SocketPort *p;
2206
2207 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2208 * anymore */
2209
2210 LIST_FOREACH(port, p, s->ports) {
2211 if (p->fd < 0)
2212 continue;
2213
2214 (void) flush_accept(p->fd);
2215 (void) flush_fd(p->fd);
2216 }
2217 }
2218
2219 static void socket_enter_running(Socket *s, int cfd) {
2220 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2221 int r;
2222
2223 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2224 * close it. */
2225
2226 assert(s);
2227
2228 /* We don't take connections anymore if we are supposed to shut down anyway */
2229 if (unit_stop_pending(UNIT(s))) {
2230
2231 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2232
2233 if (cfd >= 0)
2234 cfd = safe_close(cfd);
2235 else
2236 flush_ports(s);
2237
2238 return;
2239 }
2240
2241 if (!ratelimit_test(&s->trigger_limit)) {
2242 safe_close(cfd);
2243 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2244 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2245 return;
2246 }
2247
2248 if (cfd < 0) {
2249 Iterator i;
2250 Unit *other;
2251 bool pending = false;
2252
2253 /* If there's already a start pending don't bother to
2254 * do anything */
2255 SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2256 if (unit_active_or_pending(other)) {
2257 pending = true;
2258 break;
2259 }
2260
2261 if (!pending) {
2262 if (!UNIT_ISSET(s->service)) {
2263 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2264 r = -ENOENT;
2265 goto fail;
2266 }
2267
2268 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2269 if (r < 0)
2270 goto fail;
2271 }
2272
2273 socket_set_state(s, SOCKET_RUNNING);
2274 } else {
2275 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2276 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2277 Service *service;
2278
2279 if (s->n_connections >= s->max_connections) {
2280 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2281 s->n_connections);
2282 safe_close(cfd);
2283 return;
2284 }
2285
2286 if (s->max_connections_per_source > 0) {
2287 r = socket_acquire_peer(s, cfd, &p);
2288 if (r < 0) {
2289 safe_close(cfd);
2290 return;
2291 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2292 _cleanup_free_ char *t = NULL;
2293
2294 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2295
2296 log_unit_warning(UNIT(s),
2297 "Too many incoming connections (%u) from source %s, dropping connection.",
2298 p->n_ref, strnull(t));
2299 safe_close(cfd);
2300 return;
2301 }
2302 }
2303
2304 r = socket_instantiate_service(s);
2305 if (r < 0)
2306 goto fail;
2307
2308 r = instance_from_socket(cfd, s->n_accepted, &instance);
2309 if (r < 0) {
2310 if (r != -ENOTCONN)
2311 goto fail;
2312
2313 /* ENOTCONN is legitimate if TCP RST was received.
2314 * This connection is over, but the socket unit lives on. */
2315 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2316 safe_close(cfd);
2317 return;
2318 }
2319
2320 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2321 if (r < 0)
2322 goto fail;
2323
2324 r = unit_name_build(prefix, instance, ".service", &name);
2325 if (r < 0)
2326 goto fail;
2327
2328 r = unit_add_name(UNIT_DEREF(s->service), name);
2329 if (r < 0)
2330 goto fail;
2331
2332 service = SERVICE(UNIT_DEREF(s->service));
2333 unit_ref_unset(&s->service);
2334
2335 s->n_accepted++;
2336 unit_choose_id(UNIT(service), name);
2337
2338 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2339 if (r < 0)
2340 goto fail;
2341
2342 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2343 s->n_connections++;
2344
2345 service->peer = p; /* Pass ownership of the peer reference */
2346 p = NULL;
2347
2348 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2349 if (r < 0) {
2350 /* We failed to activate the new service, but it still exists. Let's make sure the service
2351 * closes and forgets the connection fd again, immediately. */
2352 service_close_socket_fd(service);
2353 goto fail;
2354 }
2355
2356 /* Notify clients about changed counters */
2357 unit_add_to_dbus_queue(UNIT(s));
2358 }
2359
2360 return;
2361
2362 fail:
2363 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2364 cfd >= 0 ? "template" : "non-template",
2365 bus_error_message(&error, r));
2366
2367 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2368 safe_close(cfd);
2369 }
2370
2371 static void socket_run_next(Socket *s) {
2372 int r;
2373
2374 assert(s);
2375 assert(s->control_command);
2376 assert(s->control_command->command_next);
2377
2378 socket_unwatch_control_pid(s);
2379
2380 s->control_command = s->control_command->command_next;
2381
2382 r = socket_spawn(s, s->control_command, &s->control_pid);
2383 if (r < 0)
2384 goto fail;
2385
2386 return;
2387
2388 fail:
2389 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2390
2391 if (s->state == SOCKET_START_POST)
2392 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2393 else if (s->state == SOCKET_STOP_POST)
2394 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2395 else
2396 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2397 }
2398
2399 static int socket_start(Unit *u) {
2400 Socket *s = SOCKET(u);
2401 int r;
2402
2403 assert(s);
2404
2405 /* We cannot fulfill this request right now, try again later
2406 * please! */
2407 if (IN_SET(s->state,
2408 SOCKET_STOP_PRE,
2409 SOCKET_STOP_PRE_SIGKILL,
2410 SOCKET_STOP_PRE_SIGTERM,
2411 SOCKET_STOP_POST,
2412 SOCKET_FINAL_SIGTERM,
2413 SOCKET_FINAL_SIGKILL))
2414 return -EAGAIN;
2415
2416 /* Already on it! */
2417 if (IN_SET(s->state,
2418 SOCKET_START_PRE,
2419 SOCKET_START_CHOWN,
2420 SOCKET_START_POST))
2421 return 0;
2422
2423 /* Cannot run this without the service being around */
2424 if (UNIT_ISSET(s->service)) {
2425 Service *service;
2426
2427 service = SERVICE(UNIT_DEREF(s->service));
2428
2429 if (UNIT(service)->load_state != UNIT_LOADED) {
2430 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2431 return -ENOENT;
2432 }
2433
2434 /* If the service is already active we cannot start the
2435 * socket */
2436 if (service->state != SERVICE_DEAD &&
2437 service->state != SERVICE_FAILED &&
2438 service->state != SERVICE_AUTO_RESTART) {
2439 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2440 return -EBUSY;
2441 }
2442 }
2443
2444 assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
2445
2446 r = unit_start_limit_test(u);
2447 if (r < 0) {
2448 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2449 return r;
2450 }
2451
2452 r = unit_acquire_invocation_id(u);
2453 if (r < 0)
2454 return r;
2455
2456 s->result = SOCKET_SUCCESS;
2457 s->reset_accounting = true;
2458
2459 socket_enter_start_pre(s);
2460 return 1;
2461 }
2462
2463 static int socket_stop(Unit *u) {
2464 Socket *s = SOCKET(u);
2465
2466 assert(s);
2467
2468 /* Already on it */
2469 if (IN_SET(s->state,
2470 SOCKET_STOP_PRE,
2471 SOCKET_STOP_PRE_SIGTERM,
2472 SOCKET_STOP_PRE_SIGKILL,
2473 SOCKET_STOP_POST,
2474 SOCKET_FINAL_SIGTERM,
2475 SOCKET_FINAL_SIGKILL))
2476 return 0;
2477
2478 /* If there's already something running we go directly into
2479 * kill mode. */
2480 if (IN_SET(s->state,
2481 SOCKET_START_PRE,
2482 SOCKET_START_CHOWN,
2483 SOCKET_START_POST)) {
2484 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2485 return -EAGAIN;
2486 }
2487
2488 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
2489
2490 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2491 return 1;
2492 }
2493
2494 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2495 Socket *s = SOCKET(u);
2496 SocketPort *p;
2497 int r;
2498
2499 assert(u);
2500 assert(f);
2501 assert(fds);
2502
2503 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2504 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2505 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
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, "control-pid")) {
2587 pid_t pid;
2588
2589 if (parse_pid(value, &pid) < 0)
2590 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2591 else
2592 s->control_pid = pid;
2593 } else if (streq(key, "control-command")) {
2594 SocketExecCommand id;
2595
2596 id = socket_exec_command_from_string(value);
2597 if (id < 0)
2598 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2599 else {
2600 s->control_command_id = id;
2601 s->control_command = s->exec_command[id];
2602 }
2603 } else if (streq(key, "fifo")) {
2604 int fd, skip = 0;
2605 SocketPort *p;
2606
2607 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2608 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2609 else
2610 LIST_FOREACH(port, p, s->ports)
2611 if (p->type == SOCKET_FIFO &&
2612 path_equal_or_files_same(p->path, value+skip, 0)) {
2613 socket_port_take_fd(p, fds, fd);
2614 break;
2615 }
2616
2617 } else if (streq(key, "special")) {
2618 int fd, skip = 0;
2619 SocketPort *p;
2620
2621 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2622 log_unit_debug(u, "Failed to parse special value: %s", value);
2623 else
2624 LIST_FOREACH(port, p, s->ports)
2625 if (p->type == SOCKET_SPECIAL &&
2626 path_equal_or_files_same(p->path, value+skip, 0)) {
2627 socket_port_take_fd(p, fds, fd);
2628 break;
2629 }
2630
2631 } else if (streq(key, "mqueue")) {
2632 int fd, skip = 0;
2633 SocketPort *p;
2634
2635 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2636 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2637 else
2638 LIST_FOREACH(port, p, s->ports)
2639 if (p->type == SOCKET_MQUEUE &&
2640 streq(p->path, value+skip)) {
2641 socket_port_take_fd(p, fds, fd);
2642 break;
2643 }
2644
2645 } else if (streq(key, "socket")) {
2646 int fd, type, skip = 0;
2647 SocketPort *p;
2648
2649 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2650 log_unit_debug(u, "Failed to parse socket value: %s", value);
2651 else
2652 LIST_FOREACH(port, p, s->ports)
2653 if (socket_address_is(&p->address, value+skip, type)) {
2654 socket_port_take_fd(p, fds, fd);
2655 break;
2656 }
2657
2658 } else if (streq(key, "netlink")) {
2659 int fd, skip = 0;
2660 SocketPort *p;
2661
2662 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2663 log_unit_debug(u, "Failed to parse socket value: %s", value);
2664 else
2665 LIST_FOREACH(port, p, s->ports)
2666 if (socket_address_is_netlink(&p->address, value+skip)) {
2667 socket_port_take_fd(p, fds, fd);
2668 break;
2669 }
2670
2671 } else if (streq(key, "ffs")) {
2672 int fd, skip = 0;
2673 SocketPort *p;
2674
2675 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2676 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2677 else
2678 LIST_FOREACH(port, p, s->ports)
2679 if (p->type == SOCKET_USB_FUNCTION &&
2680 path_equal_or_files_same(p->path, value+skip, 0)) {
2681 socket_port_take_fd(p, fds, fd);
2682 break;
2683 }
2684
2685 } else
2686 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2687
2688 return 0;
2689 }
2690
2691 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2692 Socket *s = SOCKET(u);
2693 SocketPort *p;
2694
2695 assert(u);
2696
2697 LIST_FOREACH(port, p, s->ports) {
2698 Iterator i;
2699 int fd;
2700
2701 if (p->type != SOCKET_SOCKET)
2702 continue;
2703
2704 if (p->fd >= 0)
2705 continue;
2706
2707 FDSET_FOREACH(fd, fds, i) {
2708 if (socket_address_matches_fd(&p->address, fd)) {
2709 p->fd = fdset_remove(fds, fd);
2710 s->deserialized_state = SOCKET_LISTENING;
2711 break;
2712 }
2713 }
2714 }
2715 }
2716
2717 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2718 assert(u);
2719
2720 return state_translation_table[SOCKET(u)->state];
2721 }
2722
2723 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2724 assert(u);
2725
2726 return socket_state_to_string(SOCKET(u)->state);
2727 }
2728
2729 const char* socket_port_type_to_string(SocketPort *p) {
2730
2731 assert(p);
2732
2733 switch (p->type) {
2734
2735 case SOCKET_SOCKET:
2736
2737 switch (p->address.type) {
2738
2739 case SOCK_STREAM:
2740 return "Stream";
2741
2742 case SOCK_DGRAM:
2743 return "Datagram";
2744
2745 case SOCK_SEQPACKET:
2746 return "SequentialPacket";
2747
2748 case SOCK_RAW:
2749 if (socket_address_family(&p->address) == AF_NETLINK)
2750 return "Netlink";
2751
2752 /* fall through */
2753 default:
2754 return NULL;
2755 }
2756
2757 case SOCKET_SPECIAL:
2758 return "Special";
2759
2760 case SOCKET_MQUEUE:
2761 return "MessageQueue";
2762
2763 case SOCKET_FIFO:
2764 return "FIFO";
2765
2766 case SOCKET_USB_FUNCTION:
2767 return "USBFunction";
2768
2769 default:
2770 return NULL;
2771 }
2772 }
2773
2774 _pure_ static bool socket_check_gc(Unit *u) {
2775 Socket *s = SOCKET(u);
2776
2777 assert(u);
2778
2779 return s->n_connections > 0;
2780 }
2781
2782 static int socket_accept_do(Socket *s, int fd) {
2783 int cfd;
2784
2785 assert(s);
2786 assert(fd >= 0);
2787
2788 for (;;) {
2789 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2790 if (cfd < 0) {
2791 if (errno == EINTR)
2792 continue;
2793
2794 return -errno;
2795 }
2796
2797 break;
2798 }
2799
2800 return cfd;
2801 }
2802
2803 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2804 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2805 int cfd, r;
2806 pid_t pid;
2807
2808 assert(s);
2809 assert(p);
2810 assert(fd >= 0);
2811
2812 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2813 * connection socket is also properly associated with the cgroup. */
2814
2815 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2816 goto shortcut;
2817
2818 r = bpf_firewall_supported();
2819 if (r < 0)
2820 return r;
2821 if (r == 0)
2822 goto shortcut;
2823
2824 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2825 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2826
2827 r = unit_fork_helper_process(UNIT(s), &pid);
2828 if (r < 0)
2829 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2830 if (r == 0) {
2831 /* Child */
2832
2833 pair[0] = safe_close(pair[0]);
2834
2835 cfd = socket_accept_do(s, fd);
2836 if (cfd < 0) {
2837 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2838 _exit(EXIT_FAILURE);
2839 }
2840
2841 r = send_one_fd(pair[1], cfd, 0);
2842 if (r < 0) {
2843 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2844 _exit(EXIT_FAILURE);
2845 }
2846
2847 _exit(EXIT_SUCCESS);
2848 }
2849
2850 pair[1] = safe_close(pair[1]);
2851 cfd = receive_one_fd(pair[0], 0);
2852
2853 /* We synchronously wait for the helper, as it shouldn't be slow */
2854 r = wait_for_terminate_and_warn("accept-cgroup-helper", pid, false);
2855 if (r < 0) {
2856 safe_close(cfd);
2857 return r;
2858 }
2859
2860 if (cfd < 0)
2861 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2862
2863 return cfd;
2864
2865 shortcut:
2866 cfd = socket_accept_do(s, fd);
2867 if (cfd < 0)
2868 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2869
2870 return cfd;
2871 }
2872
2873 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2874 SocketPort *p = userdata;
2875 int cfd = -1;
2876
2877 assert(p);
2878 assert(fd >= 0);
2879
2880 if (p->socket->state != SOCKET_LISTENING)
2881 return 0;
2882
2883 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2884
2885 if (revents != EPOLLIN) {
2886
2887 if (revents & EPOLLHUP)
2888 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.");
2889 else
2890 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2891 goto fail;
2892 }
2893
2894 if (p->socket->accept &&
2895 p->type == SOCKET_SOCKET &&
2896 socket_address_can_accept(&p->address)) {
2897
2898 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2899 if (cfd < 0)
2900 goto fail;
2901
2902 socket_apply_socket_options(p->socket, cfd);
2903 }
2904
2905 socket_enter_running(p->socket, cfd);
2906 return 0;
2907
2908 fail:
2909 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2910 return 0;
2911 }
2912
2913 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2914 Socket *s = SOCKET(u);
2915 SocketResult f;
2916
2917 assert(s);
2918 assert(pid >= 0);
2919
2920 if (pid != s->control_pid)
2921 return;
2922
2923 s->control_pid = 0;
2924
2925 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2926 f = SOCKET_SUCCESS;
2927 else if (code == CLD_EXITED)
2928 f = SOCKET_FAILURE_EXIT_CODE;
2929 else if (code == CLD_KILLED)
2930 f = SOCKET_FAILURE_SIGNAL;
2931 else if (code == CLD_DUMPED)
2932 f = SOCKET_FAILURE_CORE_DUMP;
2933 else
2934 assert_not_reached("Unknown sigchld code");
2935
2936 if (s->control_command) {
2937 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2938
2939 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2940 f = SOCKET_SUCCESS;
2941 }
2942
2943 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2944 "Control process exited, code=%s status=%i",
2945 sigchld_code_to_string(code), status);
2946
2947 if (s->result == SOCKET_SUCCESS)
2948 s->result = f;
2949
2950 if (s->control_command &&
2951 s->control_command->command_next &&
2952 f == SOCKET_SUCCESS) {
2953
2954 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2955 socket_run_next(s);
2956 } else {
2957 s->control_command = NULL;
2958 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2959
2960 /* No further commands for this step, so let's figure
2961 * out what to do next */
2962
2963 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2964
2965 switch (s->state) {
2966
2967 case SOCKET_START_PRE:
2968 if (f == SOCKET_SUCCESS)
2969 socket_enter_start_chown(s);
2970 else
2971 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2972 break;
2973
2974 case SOCKET_START_CHOWN:
2975 if (f == SOCKET_SUCCESS)
2976 socket_enter_start_post(s);
2977 else
2978 socket_enter_stop_pre(s, f);
2979 break;
2980
2981 case SOCKET_START_POST:
2982 if (f == SOCKET_SUCCESS)
2983 socket_enter_listening(s);
2984 else
2985 socket_enter_stop_pre(s, f);
2986 break;
2987
2988 case SOCKET_STOP_PRE:
2989 case SOCKET_STOP_PRE_SIGTERM:
2990 case SOCKET_STOP_PRE_SIGKILL:
2991 socket_enter_stop_post(s, f);
2992 break;
2993
2994 case SOCKET_STOP_POST:
2995 case SOCKET_FINAL_SIGTERM:
2996 case SOCKET_FINAL_SIGKILL:
2997 socket_enter_dead(s, f);
2998 break;
2999
3000 default:
3001 assert_not_reached("Uh, control process died at wrong time.");
3002 }
3003 }
3004
3005 /* Notify clients about changed exit status */
3006 unit_add_to_dbus_queue(u);
3007 }
3008
3009 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3010 Socket *s = SOCKET(userdata);
3011
3012 assert(s);
3013 assert(s->timer_event_source == source);
3014
3015 switch (s->state) {
3016
3017 case SOCKET_START_PRE:
3018 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3019 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3020 break;
3021
3022 case SOCKET_START_CHOWN:
3023 case SOCKET_START_POST:
3024 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3025 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3026 break;
3027
3028 case SOCKET_STOP_PRE:
3029 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3030 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3031 break;
3032
3033 case SOCKET_STOP_PRE_SIGTERM:
3034 if (s->kill_context.send_sigkill) {
3035 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3036 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3037 } else {
3038 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3039 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3040 }
3041 break;
3042
3043 case SOCKET_STOP_PRE_SIGKILL:
3044 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3045 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3046 break;
3047
3048 case SOCKET_STOP_POST:
3049 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3050 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3051 break;
3052
3053 case SOCKET_FINAL_SIGTERM:
3054 if (s->kill_context.send_sigkill) {
3055 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3056 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3057 } else {
3058 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3059 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3060 }
3061 break;
3062
3063 case SOCKET_FINAL_SIGKILL:
3064 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3065 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3066 break;
3067
3068 default:
3069 assert_not_reached("Timeout at wrong time.");
3070 }
3071
3072 return 0;
3073 }
3074
3075 int socket_collect_fds(Socket *s, int **fds) {
3076 int *rfds, k = 0, n = 0;
3077 SocketPort *p;
3078
3079 assert(s);
3080 assert(fds);
3081
3082 /* Called from the service code for requesting our fds */
3083
3084 LIST_FOREACH(port, p, s->ports) {
3085 if (p->fd >= 0)
3086 n++;
3087 n += p->n_auxiliary_fds;
3088 }
3089
3090 if (n <= 0) {
3091 *fds = NULL;
3092 return 0;
3093 }
3094
3095 rfds = new(int, n);
3096 if (!rfds)
3097 return -ENOMEM;
3098
3099 LIST_FOREACH(port, p, s->ports) {
3100 int i;
3101
3102 if (p->fd >= 0)
3103 rfds[k++] = p->fd;
3104 for (i = 0; i < p->n_auxiliary_fds; ++i)
3105 rfds[k++] = p->auxiliary_fds[i];
3106 }
3107
3108 assert(k == n);
3109
3110 *fds = rfds;
3111 return n;
3112 }
3113
3114 static void socket_reset_failed(Unit *u) {
3115 Socket *s = SOCKET(u);
3116
3117 assert(s);
3118
3119 if (s->state == SOCKET_FAILED)
3120 socket_set_state(s, SOCKET_DEAD);
3121
3122 s->result = SOCKET_SUCCESS;
3123 }
3124
3125 void socket_connection_unref(Socket *s) {
3126 assert(s);
3127
3128 /* The service is dead. Yay!
3129 *
3130 * This is strictly for one-instance-per-connection
3131 * services. */
3132
3133 assert(s->n_connections > 0);
3134 s->n_connections--;
3135
3136 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3137 }
3138
3139 static void socket_trigger_notify(Unit *u, Unit *other) {
3140 Socket *s = SOCKET(u);
3141
3142 assert(u);
3143 assert(other);
3144
3145 /* Filter out invocations with bogus state */
3146 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3147 return;
3148
3149 /* Don't propagate state changes from the service if we are already down */
3150 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3151 return;
3152
3153 /* We don't care for the service state if we are in Accept=yes mode */
3154 if (s->accept)
3155 return;
3156
3157 /* Propagate start limit hit state */
3158 if (other->start_limit_hit) {
3159 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3160 return;
3161 }
3162
3163 /* Don't propagate anything if there's still a job queued */
3164 if (other->job)
3165 return;
3166
3167 if (IN_SET(SERVICE(other)->state,
3168 SERVICE_DEAD, SERVICE_FAILED,
3169 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3170 SERVICE_AUTO_RESTART))
3171 socket_enter_listening(s);
3172
3173 if (SERVICE(other)->state == SERVICE_RUNNING)
3174 socket_set_state(s, SOCKET_RUNNING);
3175 }
3176
3177 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3178 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3179 }
3180
3181 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3182 Socket *s = SOCKET(u);
3183 usec_t t;
3184 int r;
3185
3186 if (!s->timer_event_source)
3187 return 0;
3188
3189 r = sd_event_source_get_time(s->timer_event_source, &t);
3190 if (r < 0)
3191 return r;
3192 if (t == USEC_INFINITY)
3193 return 0;
3194
3195 *timeout = t;
3196 return 1;
3197 }
3198
3199 char *socket_fdname(Socket *s) {
3200 assert(s);
3201
3202 /* Returns the name to use for $LISTEN_NAMES. If the user
3203 * didn't specify anything specifically, use the socket unit's
3204 * name as fallback. */
3205
3206 if (s->fdname)
3207 return s->fdname;
3208
3209 return UNIT(s)->id;
3210 }
3211
3212 static int socket_control_pid(Unit *u) {
3213 Socket *s = SOCKET(u);
3214
3215 assert(s);
3216
3217 return s->control_pid;
3218 }
3219
3220 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3221 [SOCKET_EXEC_START_PRE] = "StartPre",
3222 [SOCKET_EXEC_START_CHOWN] = "StartChown",
3223 [SOCKET_EXEC_START_POST] = "StartPost",
3224 [SOCKET_EXEC_STOP_PRE] = "StopPre",
3225 [SOCKET_EXEC_STOP_POST] = "StopPost"
3226 };
3227
3228 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3229
3230 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3231 [SOCKET_SUCCESS] = "success",
3232 [SOCKET_FAILURE_RESOURCES] = "resources",
3233 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3234 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3235 [SOCKET_FAILURE_SIGNAL] = "signal",
3236 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3237 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3238 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3239 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3240 };
3241
3242 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3243
3244 const UnitVTable socket_vtable = {
3245 .object_size = sizeof(Socket),
3246 .exec_context_offset = offsetof(Socket, exec_context),
3247 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3248 .kill_context_offset = offsetof(Socket, kill_context),
3249 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3250 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3251
3252 .sections =
3253 "Unit\0"
3254 "Socket\0"
3255 "Install\0",
3256 .private_section = "Socket",
3257
3258 .init = socket_init,
3259 .done = socket_done,
3260 .load = socket_load,
3261
3262 .coldplug = socket_coldplug,
3263
3264 .dump = socket_dump,
3265
3266 .start = socket_start,
3267 .stop = socket_stop,
3268
3269 .kill = socket_kill,
3270
3271 .get_timeout = socket_get_timeout,
3272
3273 .serialize = socket_serialize,
3274 .deserialize_item = socket_deserialize_item,
3275 .distribute_fds = socket_distribute_fds,
3276
3277 .active_state = socket_active_state,
3278 .sub_state_to_string = socket_sub_state_to_string,
3279
3280 .check_gc = socket_check_gc,
3281
3282 .sigchld_event = socket_sigchld_event,
3283
3284 .trigger_notify = socket_trigger_notify,
3285
3286 .reset_failed = socket_reset_failed,
3287
3288 .control_pid = socket_control_pid,
3289
3290 .bus_vtable = bus_socket_vtable,
3291 .bus_set_property = bus_socket_set_property,
3292 .bus_commit_properties = bus_socket_commit_properties,
3293
3294 .status_message_formats = {
3295 /*.starting_stopping = {
3296 [0] = "Starting socket %s...",
3297 [1] = "Stopping socket %s...",
3298 },*/
3299 .finished_start_job = {
3300 [JOB_DONE] = "Listening on %s.",
3301 [JOB_FAILED] = "Failed to listen on %s.",
3302 [JOB_TIMEOUT] = "Timed out starting %s.",
3303 },
3304 .finished_stop_job = {
3305 [JOB_DONE] = "Closed %s.",
3306 [JOB_FAILED] = "Failed stopping %s.",
3307 [JOB_TIMEOUT] = "Timed out stopping %s.",
3308 },
3309 },
3310 };
Unnamed repository; edit this file 'description' to name the repository.