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[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 (void) 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 (void) mkdir_parents_label(*i, s->directory_mode);
1338
1339 r = symlink_idempotent(p, *i);
1340
1341 if (r == -EEXIST && s->remove_on_stop) {
1342 /* If there's already something where we want to create the symlink, and the destructive
1343 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1344 * again. */
1345
1346 if (unlink(*i) >= 0)
1347 r = symlink_idempotent(p, *i);
1348 }
1349
1350 if (r < 0)
1351 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", p, *i);
1352 }
1353
1354 return 0;
1355 }
1356
1357 static int usbffs_write_descs(int fd, Service *s) {
1358 int r;
1359
1360 if (!s->usb_function_descriptors || !s->usb_function_strings)
1361 return -EINVAL;
1362
1363 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1364 if (r < 0)
1365 return r;
1366
1367 return copy_file_fd(s->usb_function_strings, fd, 0);
1368 }
1369
1370 static int usbffs_select_ep(const struct dirent *d) {
1371 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1372 }
1373
1374 static int usbffs_dispatch_eps(SocketPort *p) {
1375 _cleanup_free_ struct dirent **ent = NULL;
1376 int r, i, n, k;
1377
1378 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1379 if (r < 0)
1380 return -errno;
1381
1382 n = r;
1383 p->auxiliary_fds = new(int, n);
1384 if (!p->auxiliary_fds)
1385 return -ENOMEM;
1386
1387 p->n_auxiliary_fds = n;
1388
1389 k = 0;
1390 for (i = 0; i < n; ++i) {
1391 _cleanup_free_ char *ep = NULL;
1392
1393 ep = path_make_absolute(ent[i]->d_name, p->path);
1394 if (!ep)
1395 return -ENOMEM;
1396
1397 path_kill_slashes(ep);
1398
1399 r = usbffs_address_create(ep);
1400 if (r < 0)
1401 goto fail;
1402
1403 p->auxiliary_fds[k] = r;
1404
1405 ++k;
1406 free(ent[i]);
1407 }
1408
1409 return r;
1410
1411 fail:
1412 close_many(p->auxiliary_fds, k);
1413 p->auxiliary_fds = mfree(p->auxiliary_fds);
1414 p->n_auxiliary_fds = 0;
1415
1416 return r;
1417 }
1418
1419 static int socket_determine_selinux_label(Socket *s, char **ret) {
1420 ExecCommand *c;
1421 int r;
1422
1423 assert(s);
1424 assert(ret);
1425
1426 if (s->selinux_context_from_net) {
1427 /* If this is requested, get label from the network label */
1428
1429 r = mac_selinux_get_our_label(ret);
1430 if (r == -EOPNOTSUPP)
1431 goto no_label;
1432
1433 } else {
1434 /* Otherwise, get it from the executable we are about to start */
1435 r = socket_instantiate_service(s);
1436 if (r < 0)
1437 return r;
1438
1439 if (!UNIT_ISSET(s->service))
1440 goto no_label;
1441
1442 c = SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START];
1443 if (!c)
1444 goto no_label;
1445
1446 r = mac_selinux_get_create_label_from_exe(c->path, ret);
1447 if (r == -EPERM || r == -EOPNOTSUPP)
1448 goto no_label;
1449 }
1450
1451 return r;
1452
1453 no_label:
1454 *ret = NULL;
1455 return 0;
1456 }
1457
1458 static int socket_address_listen_do(
1459 Socket *s,
1460 const SocketAddress *address,
1461 const char *label) {
1462
1463 assert(s);
1464 assert(address);
1465
1466 return socket_address_listen(
1467 address,
1468 SOCK_CLOEXEC|SOCK_NONBLOCK,
1469 s->backlog,
1470 s->bind_ipv6_only,
1471 s->bind_to_device,
1472 s->reuse_port,
1473 s->free_bind,
1474 s->transparent,
1475 s->directory_mode,
1476 s->socket_mode,
1477 label);
1478 }
1479
1480 static int socket_address_listen_in_cgroup(
1481 Socket *s,
1482 const SocketAddress *address,
1483 const char *label) {
1484
1485 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1486 int fd, r;
1487 pid_t pid;
1488
1489 assert(s);
1490 assert(address);
1491
1492 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
1493 * in which the socket is actually created. This way we ensure the socket is actually properly attached to the
1494 * unit's cgroup for the purpose of BPF filtering and such. */
1495
1496 if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
1497 goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
1498
1499 r = bpf_firewall_supported();
1500 if (r < 0)
1501 return r;
1502 if (r == 0) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1503 goto shortcut;
1504
1505 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1506 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1507
1508 r = unit_fork_helper_process(UNIT(s), &pid);
1509 if (r < 0)
1510 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1511 if (r == 0) {
1512 /* Child */
1513
1514 pair[0] = safe_close(pair[0]);
1515
1516 fd = socket_address_listen_do(s, address, label);
1517 if (fd < 0) {
1518 log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
1519 _exit(EXIT_FAILURE);
1520 }
1521
1522 r = send_one_fd(pair[1], fd, 0);
1523 if (r < 0) {
1524 log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
1525 _exit(EXIT_FAILURE);
1526 }
1527
1528 _exit(EXIT_SUCCESS);
1529 }
1530
1531 pair[1] = safe_close(pair[1]);
1532 fd = receive_one_fd(pair[0], 0);
1533
1534 /* We synchronously wait for the helper, as it shouldn't be slow */
1535 r = wait_for_terminate_and_warn("listen-cgroup-helper", pid, false);
1536 if (r < 0) {
1537 safe_close(fd);
1538 return r;
1539 }
1540
1541 if (fd < 0)
1542 return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
1543
1544 return fd;
1545
1546 shortcut:
1547 fd = socket_address_listen_do(s, address, label);
1548 if (fd < 0)
1549 return log_error_errno(fd, "Failed to create listening socket: %m");
1550
1551 return fd;
1552 }
1553
1554 static int socket_open_fds(Socket *s) {
1555 _cleanup_(mac_selinux_freep) char *label = NULL;
1556 bool know_label = false;
1557 SocketPort *p;
1558 int r;
1559
1560 assert(s);
1561
1562 LIST_FOREACH(port, p, s->ports) {
1563
1564 if (p->fd >= 0)
1565 continue;
1566
1567 switch (p->type) {
1568
1569 case SOCKET_SOCKET:
1570
1571 if (!know_label) {
1572 /* Figure out label, if we don't it know yet. We do it once, for the first socket where
1573 * we need this and remember it for the rest. */
1574
1575 r = socket_determine_selinux_label(s, &label);
1576 if (r < 0)
1577 goto rollback;
1578
1579 know_label = true;
1580 }
1581
1582 /* Apply the socket protocol */
1583 switch (p->address.type) {
1584
1585 case SOCK_STREAM:
1586 case SOCK_SEQPACKET:
1587 if (s->socket_protocol == IPPROTO_SCTP)
1588 p->address.protocol = s->socket_protocol;
1589 break;
1590
1591 case SOCK_DGRAM:
1592 if (s->socket_protocol == IPPROTO_UDPLITE)
1593 p->address.protocol = s->socket_protocol;
1594 break;
1595 }
1596
1597 r = socket_address_listen_in_cgroup(s, &p->address, label);
1598 if (r < 0)
1599 goto rollback;
1600
1601 p->fd = r;
1602 socket_apply_socket_options(s, p->fd);
1603 socket_symlink(s);
1604 break;
1605
1606 case SOCKET_SPECIAL:
1607
1608 p->fd = special_address_create(p->path, s->writable);
1609 if (p->fd < 0) {
1610 r = p->fd;
1611 goto rollback;
1612 }
1613 break;
1614
1615 case SOCKET_FIFO:
1616
1617 p->fd = fifo_address_create(
1618 p->path,
1619 s->directory_mode,
1620 s->socket_mode);
1621 if (p->fd < 0) {
1622 r = p->fd;
1623 goto rollback;
1624 }
1625
1626 socket_apply_fifo_options(s, p->fd);
1627 socket_symlink(s);
1628 break;
1629
1630 case SOCKET_MQUEUE:
1631
1632 p->fd = mq_address_create(
1633 p->path,
1634 s->socket_mode,
1635 s->mq_maxmsg,
1636 s->mq_msgsize);
1637 if (p->fd < 0) {
1638 r = p->fd;
1639 goto rollback;
1640 }
1641 break;
1642
1643 case SOCKET_USB_FUNCTION: {
1644 _cleanup_free_ char *ep = NULL;
1645
1646 ep = path_make_absolute("ep0", p->path);
1647
1648 p->fd = usbffs_address_create(ep);
1649 if (p->fd < 0) {
1650 r = p->fd;
1651 goto rollback;
1652 }
1653
1654 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1655 if (r < 0)
1656 goto rollback;
1657
1658 r = usbffs_dispatch_eps(p);
1659 if (r < 0)
1660 goto rollback;
1661
1662 break;
1663 }
1664 default:
1665 assert_not_reached("Unknown port type");
1666 }
1667 }
1668
1669 return 0;
1670
1671 rollback:
1672 socket_close_fds(s);
1673 return r;
1674 }
1675
1676 static void socket_unwatch_fds(Socket *s) {
1677 SocketPort *p;
1678 int r;
1679
1680 assert(s);
1681
1682 LIST_FOREACH(port, p, s->ports) {
1683 if (p->fd < 0)
1684 continue;
1685
1686 if (!p->event_source)
1687 continue;
1688
1689 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1690 if (r < 0)
1691 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1692 }
1693 }
1694
1695 static int socket_watch_fds(Socket *s) {
1696 SocketPort *p;
1697 int r;
1698
1699 assert(s);
1700
1701 LIST_FOREACH(port, p, s->ports) {
1702 if (p->fd < 0)
1703 continue;
1704
1705 if (p->event_source) {
1706 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1707 if (r < 0)
1708 goto fail;
1709 } else {
1710 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1711 if (r < 0)
1712 goto fail;
1713
1714 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1715 }
1716 }
1717
1718 return 0;
1719
1720 fail:
1721 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1722 socket_unwatch_fds(s);
1723 return r;
1724 }
1725
1726 enum {
1727 SOCKET_OPEN_NONE,
1728 SOCKET_OPEN_SOME,
1729 SOCKET_OPEN_ALL,
1730 };
1731
1732 static int socket_check_open(Socket *s) {
1733 bool have_open = false, have_closed = false;
1734 SocketPort *p;
1735
1736 assert(s);
1737
1738 LIST_FOREACH(port, p, s->ports) {
1739 if (p->fd < 0)
1740 have_closed = true;
1741 else
1742 have_open = true;
1743
1744 if (have_open && have_closed)
1745 return SOCKET_OPEN_SOME;
1746 }
1747
1748 if (have_open)
1749 return SOCKET_OPEN_ALL;
1750
1751 return SOCKET_OPEN_NONE;
1752 }
1753
1754 static void socket_set_state(Socket *s, SocketState state) {
1755 SocketState old_state;
1756 assert(s);
1757
1758 old_state = s->state;
1759 s->state = state;
1760
1761 if (!IN_SET(state,
1762 SOCKET_START_PRE,
1763 SOCKET_START_CHOWN,
1764 SOCKET_START_POST,
1765 SOCKET_STOP_PRE,
1766 SOCKET_STOP_PRE_SIGTERM,
1767 SOCKET_STOP_PRE_SIGKILL,
1768 SOCKET_STOP_POST,
1769 SOCKET_FINAL_SIGTERM,
1770 SOCKET_FINAL_SIGKILL)) {
1771
1772 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1773 socket_unwatch_control_pid(s);
1774 s->control_command = NULL;
1775 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1776 }
1777
1778 if (state != SOCKET_LISTENING)
1779 socket_unwatch_fds(s);
1780
1781 if (!IN_SET(state,
1782 SOCKET_START_CHOWN,
1783 SOCKET_START_POST,
1784 SOCKET_LISTENING,
1785 SOCKET_RUNNING,
1786 SOCKET_STOP_PRE,
1787 SOCKET_STOP_PRE_SIGTERM,
1788 SOCKET_STOP_PRE_SIGKILL))
1789 socket_close_fds(s);
1790
1791 if (state != old_state)
1792 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1793
1794 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1795 }
1796
1797 static int socket_coldplug(Unit *u) {
1798 Socket *s = SOCKET(u);
1799 int r;
1800
1801 assert(s);
1802 assert(s->state == SOCKET_DEAD);
1803
1804 if (s->deserialized_state == s->state)
1805 return 0;
1806
1807 if (s->control_pid > 0 &&
1808 pid_is_unwaited(s->control_pid) &&
1809 IN_SET(s->deserialized_state,
1810 SOCKET_START_PRE,
1811 SOCKET_START_CHOWN,
1812 SOCKET_START_POST,
1813 SOCKET_STOP_PRE,
1814 SOCKET_STOP_PRE_SIGTERM,
1815 SOCKET_STOP_PRE_SIGKILL,
1816 SOCKET_STOP_POST,
1817 SOCKET_FINAL_SIGTERM,
1818 SOCKET_FINAL_SIGKILL)) {
1819
1820 r = unit_watch_pid(UNIT(s), s->control_pid);
1821 if (r < 0)
1822 return r;
1823
1824 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1825 if (r < 0)
1826 return r;
1827 }
1828
1829 if (IN_SET(s->deserialized_state,
1830 SOCKET_START_CHOWN,
1831 SOCKET_START_POST,
1832 SOCKET_LISTENING,
1833 SOCKET_RUNNING)) {
1834
1835 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1836 * for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
1837 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1838 * and if there's a mismatch, warn loudly. */
1839
1840 r = socket_check_open(s);
1841 if (r == SOCKET_OPEN_NONE)
1842 log_unit_warning(UNIT(s),
1843 "Socket unit configuration has changed while unit has been running, "
1844 "no open socket file descriptor left. "
1845 "The socket unit is not functional until restarted.");
1846 else if (r == SOCKET_OPEN_SOME)
1847 log_unit_warning(UNIT(s),
1848 "Socket unit configuration has changed while unit has been running, "
1849 "and some socket file descriptors have not been opened yet. "
1850 "The socket unit is not fully functional until restarted.");
1851 }
1852
1853 if (s->deserialized_state == SOCKET_LISTENING) {
1854 r = socket_watch_fds(s);
1855 if (r < 0)
1856 return r;
1857 }
1858
1859 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED))
1860 (void) unit_setup_dynamic_creds(u);
1861
1862 socket_set_state(s, s->deserialized_state);
1863 return 0;
1864 }
1865
1866 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1867 pid_t pid;
1868 int r;
1869 ExecParameters exec_params = {
1870 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1871 .stdin_fd = -1,
1872 .stdout_fd = -1,
1873 .stderr_fd = -1,
1874 };
1875
1876 assert(s);
1877 assert(c);
1878 assert(_pid);
1879
1880 (void) unit_realize_cgroup(UNIT(s));
1881 if (s->reset_accounting) {
1882 (void) unit_reset_cpu_accounting(UNIT(s));
1883 (void) unit_reset_ip_accounting(UNIT(s));
1884 s->reset_accounting = false;
1885 }
1886
1887 r = unit_setup_exec_runtime(UNIT(s));
1888 if (r < 0)
1889 return r;
1890
1891 r = unit_setup_dynamic_creds(UNIT(s));
1892 if (r < 0)
1893 return r;
1894
1895 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1896 if (r < 0)
1897 return r;
1898
1899 manager_set_exec_params(UNIT(s)->manager, &exec_params);
1900 unit_set_exec_params(UNIT(s), &exec_params);
1901
1902 exec_params.argv = c->argv;
1903
1904 r = exec_spawn(UNIT(s),
1905 c,
1906 &s->exec_context,
1907 &exec_params,
1908 s->exec_runtime,
1909 &s->dynamic_creds,
1910 &pid);
1911 if (r < 0)
1912 return r;
1913
1914 r = unit_watch_pid(UNIT(s), pid);
1915 if (r < 0)
1916 /* FIXME: we need to do something here */
1917 return r;
1918
1919 *_pid = pid;
1920
1921 return 0;
1922 }
1923
1924 static int socket_chown(Socket *s, pid_t *_pid) {
1925 pid_t pid;
1926 int r;
1927
1928 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1929 if (r < 0)
1930 goto fail;
1931
1932 /* We have to resolve the user names out-of-process, hence
1933 * let's fork here. It's messy, but well, what can we do? */
1934
1935 r = unit_fork_helper_process(UNIT(s), &pid);
1936 if (r < 0)
1937 return r;
1938 if (r == 0) {
1939 uid_t uid = UID_INVALID;
1940 gid_t gid = GID_INVALID;
1941 SocketPort *p;
1942
1943 /* Child */
1944
1945 if (!isempty(s->user)) {
1946 const char *user = s->user;
1947
1948 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1949 if (r < 0) {
1950 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1951 _exit(EXIT_USER);
1952 }
1953 }
1954
1955 if (!isempty(s->group)) {
1956 const char *group = s->group;
1957
1958 r = get_group_creds(&group, &gid);
1959 if (r < 0) {
1960 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
1961 _exit(EXIT_GROUP);
1962 }
1963 }
1964
1965 LIST_FOREACH(port, p, s->ports) {
1966 const char *path = NULL;
1967
1968 if (p->type == SOCKET_SOCKET)
1969 path = socket_address_get_path(&p->address);
1970 else if (p->type == SOCKET_FIFO)
1971 path = p->path;
1972
1973 if (!path)
1974 continue;
1975
1976 if (chown(path, uid, gid) < 0) {
1977 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
1978 _exit(EXIT_CHOWN);
1979 }
1980 }
1981
1982 _exit(EXIT_SUCCESS);
1983 }
1984
1985 r = unit_watch_pid(UNIT(s), pid);
1986 if (r < 0)
1987 goto fail;
1988
1989 *_pid = pid;
1990 return 0;
1991
1992 fail:
1993 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1994 return r;
1995 }
1996
1997 static void socket_enter_dead(Socket *s, SocketResult f) {
1998 assert(s);
1999
2000 if (s->result == SOCKET_SUCCESS)
2001 s->result = f;
2002
2003 if (s->result != SOCKET_SUCCESS)
2004 log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
2005
2006 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2007
2008 exec_runtime_destroy(s->exec_runtime);
2009 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
2010
2011 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
2012
2013 unit_unref_uid_gid(UNIT(s), true);
2014
2015 dynamic_creds_destroy(&s->dynamic_creds);
2016 }
2017
2018 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2019
2020 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2021 int r;
2022 assert(s);
2023
2024 if (s->result == SOCKET_SUCCESS)
2025 s->result = f;
2026
2027 socket_unwatch_control_pid(s);
2028 s->control_command_id = SOCKET_EXEC_STOP_POST;
2029 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2030
2031 if (s->control_command) {
2032 r = socket_spawn(s, s->control_command, &s->control_pid);
2033 if (r < 0)
2034 goto fail;
2035
2036 socket_set_state(s, SOCKET_STOP_POST);
2037 } else
2038 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2039
2040 return;
2041
2042 fail:
2043 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2044 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2045 }
2046
2047 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2048 int r;
2049
2050 assert(s);
2051
2052 if (s->result == SOCKET_SUCCESS)
2053 s->result = f;
2054
2055 r = unit_kill_context(
2056 UNIT(s),
2057 &s->kill_context,
2058 (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ?
2059 KILL_KILL : KILL_TERMINATE,
2060 -1,
2061 s->control_pid,
2062 false);
2063 if (r < 0)
2064 goto fail;
2065
2066 if (r > 0) {
2067 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2068 if (r < 0)
2069 goto fail;
2070
2071 socket_set_state(s, state);
2072 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2073 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2074 else if (state == SOCKET_STOP_PRE_SIGKILL)
2075 socket_enter_stop_post(s, SOCKET_SUCCESS);
2076 else if (state == SOCKET_FINAL_SIGTERM)
2077 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2078 else
2079 socket_enter_dead(s, SOCKET_SUCCESS);
2080
2081 return;
2082
2083 fail:
2084 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2085
2086 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2087 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2088 else
2089 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2090 }
2091
2092 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2093 int r;
2094 assert(s);
2095
2096 if (s->result == SOCKET_SUCCESS)
2097 s->result = f;
2098
2099 socket_unwatch_control_pid(s);
2100 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2101 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2102
2103 if (s->control_command) {
2104 r = socket_spawn(s, s->control_command, &s->control_pid);
2105 if (r < 0)
2106 goto fail;
2107
2108 socket_set_state(s, SOCKET_STOP_PRE);
2109 } else
2110 socket_enter_stop_post(s, SOCKET_SUCCESS);
2111
2112 return;
2113
2114 fail:
2115 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2116 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2117 }
2118
2119 static void socket_enter_listening(Socket *s) {
2120 int r;
2121 assert(s);
2122
2123 r = socket_watch_fds(s);
2124 if (r < 0) {
2125 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2126 goto fail;
2127 }
2128
2129 socket_set_state(s, SOCKET_LISTENING);
2130 return;
2131
2132 fail:
2133 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2134 }
2135
2136 static void socket_enter_start_post(Socket *s) {
2137 int r;
2138 assert(s);
2139
2140 socket_unwatch_control_pid(s);
2141 s->control_command_id = SOCKET_EXEC_START_POST;
2142 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2143
2144 if (s->control_command) {
2145 r = socket_spawn(s, s->control_command, &s->control_pid);
2146 if (r < 0) {
2147 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2148 goto fail;
2149 }
2150
2151 socket_set_state(s, SOCKET_START_POST);
2152 } else
2153 socket_enter_listening(s);
2154
2155 return;
2156
2157 fail:
2158 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2159 }
2160
2161 static void socket_enter_start_chown(Socket *s) {
2162 int r;
2163
2164 assert(s);
2165
2166 r = socket_open_fds(s);
2167 if (r < 0) {
2168 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2169 goto fail;
2170 }
2171
2172 if (!isempty(s->user) || !isempty(s->group)) {
2173
2174 socket_unwatch_control_pid(s);
2175 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2176 s->control_command = NULL;
2177
2178 r = socket_chown(s, &s->control_pid);
2179 if (r < 0) {
2180 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2181 goto fail;
2182 }
2183
2184 socket_set_state(s, SOCKET_START_CHOWN);
2185 } else
2186 socket_enter_start_post(s);
2187
2188 return;
2189
2190 fail:
2191 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2192 }
2193
2194 static void socket_enter_start_pre(Socket *s) {
2195 int r;
2196 assert(s);
2197
2198 socket_unwatch_control_pid(s);
2199 s->control_command_id = SOCKET_EXEC_START_PRE;
2200 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2201
2202 if (s->control_command) {
2203 r = socket_spawn(s, s->control_command, &s->control_pid);
2204 if (r < 0) {
2205 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2206 goto fail;
2207 }
2208
2209 socket_set_state(s, SOCKET_START_PRE);
2210 } else
2211 socket_enter_start_chown(s);
2212
2213 return;
2214
2215 fail:
2216 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2217 }
2218
2219 static void flush_ports(Socket *s) {
2220 SocketPort *p;
2221
2222 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2223 * anymore */
2224
2225 LIST_FOREACH(port, p, s->ports) {
2226 if (p->fd < 0)
2227 continue;
2228
2229 (void) flush_accept(p->fd);
2230 (void) flush_fd(p->fd);
2231 }
2232 }
2233
2234 static void socket_enter_running(Socket *s, int cfd) {
2235 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2236 int r;
2237
2238 /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
2239 * close it. */
2240
2241 assert(s);
2242
2243 /* We don't take connections anymore if we are supposed to shut down anyway */
2244 if (unit_stop_pending(UNIT(s))) {
2245
2246 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2247
2248 if (cfd >= 0)
2249 cfd = safe_close(cfd);
2250 else
2251 flush_ports(s);
2252
2253 return;
2254 }
2255
2256 if (!ratelimit_test(&s->trigger_limit)) {
2257 safe_close(cfd);
2258 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2259 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2260 return;
2261 }
2262
2263 if (cfd < 0) {
2264 Iterator i;
2265 Unit *other;
2266 bool pending = false;
2267
2268 /* If there's already a start pending don't bother to
2269 * do anything */
2270 SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
2271 if (unit_active_or_pending(other)) {
2272 pending = true;
2273 break;
2274 }
2275
2276 if (!pending) {
2277 if (!UNIT_ISSET(s->service)) {
2278 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
2279 r = -ENOENT;
2280 goto fail;
2281 }
2282
2283 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL);
2284 if (r < 0)
2285 goto fail;
2286 }
2287
2288 socket_set_state(s, SOCKET_RUNNING);
2289 } else {
2290 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
2291 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2292 Service *service;
2293
2294 if (s->n_connections >= s->max_connections) {
2295 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2296 s->n_connections);
2297 safe_close(cfd);
2298 return;
2299 }
2300
2301 if (s->max_connections_per_source > 0) {
2302 r = socket_acquire_peer(s, cfd, &p);
2303 if (r < 0) {
2304 safe_close(cfd);
2305 return;
2306 } else if (r > 0 && p->n_ref > s->max_connections_per_source) {
2307 _cleanup_free_ char *t = NULL;
2308
2309 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2310
2311 log_unit_warning(UNIT(s),
2312 "Too many incoming connections (%u) from source %s, dropping connection.",
2313 p->n_ref, strnull(t));
2314 safe_close(cfd);
2315 return;
2316 }
2317 }
2318
2319 r = socket_instantiate_service(s);
2320 if (r < 0)
2321 goto fail;
2322
2323 r = instance_from_socket(cfd, s->n_accepted, &instance);
2324 if (r < 0) {
2325 if (r != -ENOTCONN)
2326 goto fail;
2327
2328 /* ENOTCONN is legitimate if TCP RST was received.
2329 * This connection is over, but the socket unit lives on. */
2330 log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
2331 safe_close(cfd);
2332 return;
2333 }
2334
2335 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
2336 if (r < 0)
2337 goto fail;
2338
2339 r = unit_name_build(prefix, instance, ".service", &name);
2340 if (r < 0)
2341 goto fail;
2342
2343 r = unit_add_name(UNIT_DEREF(s->service), name);
2344 if (r < 0)
2345 goto fail;
2346
2347 service = SERVICE(UNIT_DEREF(s->service));
2348 unit_ref_unset(&s->service);
2349
2350 s->n_accepted++;
2351 unit_choose_id(UNIT(service), name);
2352
2353 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
2354 if (r < 0)
2355 goto fail;
2356
2357 cfd = -1; /* We passed ownership of the fd to the service now. Forget it here. */
2358 s->n_connections++;
2359
2360 service->peer = p; /* Pass ownership of the peer reference */
2361 p = NULL;
2362
2363 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
2364 if (r < 0) {
2365 /* We failed to activate the new service, but it still exists. Let's make sure the service
2366 * closes and forgets the connection fd again, immediately. */
2367 service_close_socket_fd(service);
2368 goto fail;
2369 }
2370
2371 /* Notify clients about changed counters */
2372 unit_add_to_dbus_queue(UNIT(s));
2373 }
2374
2375 return;
2376
2377 fail:
2378 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2379 cfd >= 0 ? "template" : "non-template",
2380 bus_error_message(&error, r));
2381
2382 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2383 safe_close(cfd);
2384 }
2385
2386 static void socket_run_next(Socket *s) {
2387 int r;
2388
2389 assert(s);
2390 assert(s->control_command);
2391 assert(s->control_command->command_next);
2392
2393 socket_unwatch_control_pid(s);
2394
2395 s->control_command = s->control_command->command_next;
2396
2397 r = socket_spawn(s, s->control_command, &s->control_pid);
2398 if (r < 0)
2399 goto fail;
2400
2401 return;
2402
2403 fail:
2404 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2405
2406 if (s->state == SOCKET_START_POST)
2407 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2408 else if (s->state == SOCKET_STOP_POST)
2409 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2410 else
2411 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2412 }
2413
2414 static int socket_start(Unit *u) {
2415 Socket *s = SOCKET(u);
2416 int r;
2417
2418 assert(s);
2419
2420 /* We cannot fulfill this request right now, try again later
2421 * please! */
2422 if (IN_SET(s->state,
2423 SOCKET_STOP_PRE,
2424 SOCKET_STOP_PRE_SIGKILL,
2425 SOCKET_STOP_PRE_SIGTERM,
2426 SOCKET_STOP_POST,
2427 SOCKET_FINAL_SIGTERM,
2428 SOCKET_FINAL_SIGKILL))
2429 return -EAGAIN;
2430
2431 /* Already on it! */
2432 if (IN_SET(s->state,
2433 SOCKET_START_PRE,
2434 SOCKET_START_CHOWN,
2435 SOCKET_START_POST))
2436 return 0;
2437
2438 /* Cannot run this without the service being around */
2439 if (UNIT_ISSET(s->service)) {
2440 Service *service;
2441
2442 service = SERVICE(UNIT_DEREF(s->service));
2443
2444 if (UNIT(service)->load_state != UNIT_LOADED) {
2445 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
2446 return -ENOENT;
2447 }
2448
2449 /* If the service is already active we cannot start the
2450 * socket */
2451 if (service->state != SERVICE_DEAD &&
2452 service->state != SERVICE_FAILED &&
2453 service->state != SERVICE_AUTO_RESTART) {
2454 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
2455 return -EBUSY;
2456 }
2457 }
2458
2459 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2460
2461 r = unit_start_limit_test(u);
2462 if (r < 0) {
2463 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
2464 return r;
2465 }
2466
2467 r = unit_acquire_invocation_id(u);
2468 if (r < 0)
2469 return r;
2470
2471 s->result = SOCKET_SUCCESS;
2472 s->reset_accounting = true;
2473
2474 socket_enter_start_pre(s);
2475 return 1;
2476 }
2477
2478 static int socket_stop(Unit *u) {
2479 Socket *s = SOCKET(u);
2480
2481 assert(s);
2482
2483 /* Already on it */
2484 if (IN_SET(s->state,
2485 SOCKET_STOP_PRE,
2486 SOCKET_STOP_PRE_SIGTERM,
2487 SOCKET_STOP_PRE_SIGKILL,
2488 SOCKET_STOP_POST,
2489 SOCKET_FINAL_SIGTERM,
2490 SOCKET_FINAL_SIGKILL))
2491 return 0;
2492
2493 /* If there's already something running we go directly into
2494 * kill mode. */
2495 if (IN_SET(s->state,
2496 SOCKET_START_PRE,
2497 SOCKET_START_CHOWN,
2498 SOCKET_START_POST)) {
2499 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2500 return -EAGAIN;
2501 }
2502
2503 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2504
2505 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2506 return 1;
2507 }
2508
2509 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2510 Socket *s = SOCKET(u);
2511 SocketPort *p;
2512 int r;
2513
2514 assert(u);
2515 assert(f);
2516 assert(fds);
2517
2518 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2519 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2520 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2521
2522 if (s->control_pid > 0)
2523 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2524
2525 if (s->control_command_id >= 0)
2526 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2527
2528 LIST_FOREACH(port, p, s->ports) {
2529 int copy;
2530
2531 if (p->fd < 0)
2532 continue;
2533
2534 copy = fdset_put_dup(fds, p->fd);
2535 if (copy < 0)
2536 return copy;
2537
2538 if (p->type == SOCKET_SOCKET) {
2539 _cleanup_free_ char *t = NULL;
2540
2541 r = socket_address_print(&p->address, &t);
2542 if (r < 0)
2543 return r;
2544
2545 if (socket_address_family(&p->address) == AF_NETLINK)
2546 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2547 else
2548 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2549
2550 } else if (p->type == SOCKET_SPECIAL)
2551 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2552 else if (p->type == SOCKET_MQUEUE)
2553 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2554 else if (p->type == SOCKET_USB_FUNCTION)
2555 unit_serialize_item_format(u, f, "ffs", "%i %s", copy, p->path);
2556 else {
2557 assert(p->type == SOCKET_FIFO);
2558 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2559 }
2560 }
2561
2562 return 0;
2563 }
2564
2565 static void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
2566 safe_close(p->fd);
2567 p->fd = fdset_remove(fds, fd);
2568 }
2569
2570 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2571 Socket *s = SOCKET(u);
2572
2573 assert(u);
2574 assert(key);
2575 assert(value);
2576
2577 if (streq(key, "state")) {
2578 SocketState state;
2579
2580 state = socket_state_from_string(value);
2581 if (state < 0)
2582 log_unit_debug(u, "Failed to parse state value: %s", value);
2583 else
2584 s->deserialized_state = state;
2585 } else if (streq(key, "result")) {
2586 SocketResult f;
2587
2588 f = socket_result_from_string(value);
2589 if (f < 0)
2590 log_unit_debug(u, "Failed to parse result value: %s", value);
2591 else if (f != SOCKET_SUCCESS)
2592 s->result = f;
2593
2594 } else if (streq(key, "n-accepted")) {
2595 unsigned k;
2596
2597 if (safe_atou(value, &k) < 0)
2598 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2599 else
2600 s->n_accepted += k;
2601 } else if (streq(key, "control-pid")) {
2602 pid_t pid;
2603
2604 if (parse_pid(value, &pid) < 0)
2605 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2606 else
2607 s->control_pid = pid;
2608 } else if (streq(key, "control-command")) {
2609 SocketExecCommand id;
2610
2611 id = socket_exec_command_from_string(value);
2612 if (id < 0)
2613 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2614 else {
2615 s->control_command_id = id;
2616 s->control_command = s->exec_command[id];
2617 }
2618 } else if (streq(key, "fifo")) {
2619 int fd, skip = 0;
2620 SocketPort *p;
2621
2622 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2623 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2624 else
2625 LIST_FOREACH(port, p, s->ports)
2626 if (p->type == SOCKET_FIFO &&
2627 path_equal_or_files_same(p->path, value+skip, 0)) {
2628 socket_port_take_fd(p, fds, fd);
2629 break;
2630 }
2631
2632 } else if (streq(key, "special")) {
2633 int fd, skip = 0;
2634 SocketPort *p;
2635
2636 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2637 log_unit_debug(u, "Failed to parse special value: %s", value);
2638 else
2639 LIST_FOREACH(port, p, s->ports)
2640 if (p->type == SOCKET_SPECIAL &&
2641 path_equal_or_files_same(p->path, value+skip, 0)) {
2642 socket_port_take_fd(p, fds, fd);
2643 break;
2644 }
2645
2646 } else if (streq(key, "mqueue")) {
2647 int fd, skip = 0;
2648 SocketPort *p;
2649
2650 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2651 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2652 else
2653 LIST_FOREACH(port, p, s->ports)
2654 if (p->type == SOCKET_MQUEUE &&
2655 streq(p->path, value+skip)) {
2656 socket_port_take_fd(p, fds, fd);
2657 break;
2658 }
2659
2660 } else if (streq(key, "socket")) {
2661 int fd, type, skip = 0;
2662 SocketPort *p;
2663
2664 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2665 log_unit_debug(u, "Failed to parse socket value: %s", value);
2666 else
2667 LIST_FOREACH(port, p, s->ports)
2668 if (socket_address_is(&p->address, value+skip, type)) {
2669 socket_port_take_fd(p, fds, fd);
2670 break;
2671 }
2672
2673 } else if (streq(key, "netlink")) {
2674 int fd, skip = 0;
2675 SocketPort *p;
2676
2677 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2678 log_unit_debug(u, "Failed to parse socket value: %s", value);
2679 else
2680 LIST_FOREACH(port, p, s->ports)
2681 if (socket_address_is_netlink(&p->address, value+skip)) {
2682 socket_port_take_fd(p, fds, fd);
2683 break;
2684 }
2685
2686 } else if (streq(key, "ffs")) {
2687 int fd, skip = 0;
2688 SocketPort *p;
2689
2690 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2691 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2692 else
2693 LIST_FOREACH(port, p, s->ports)
2694 if (p->type == SOCKET_USB_FUNCTION &&
2695 path_equal_or_files_same(p->path, value+skip, 0)) {
2696 socket_port_take_fd(p, fds, fd);
2697 break;
2698 }
2699
2700 } else
2701 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2702
2703 return 0;
2704 }
2705
2706 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2707 Socket *s = SOCKET(u);
2708 SocketPort *p;
2709
2710 assert(u);
2711
2712 LIST_FOREACH(port, p, s->ports) {
2713 Iterator i;
2714 int fd;
2715
2716 if (p->type != SOCKET_SOCKET)
2717 continue;
2718
2719 if (p->fd >= 0)
2720 continue;
2721
2722 FDSET_FOREACH(fd, fds, i) {
2723 if (socket_address_matches_fd(&p->address, fd)) {
2724 p->fd = fdset_remove(fds, fd);
2725 s->deserialized_state = SOCKET_LISTENING;
2726 break;
2727 }
2728 }
2729 }
2730 }
2731
2732 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2733 assert(u);
2734
2735 return state_translation_table[SOCKET(u)->state];
2736 }
2737
2738 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2739 assert(u);
2740
2741 return socket_state_to_string(SOCKET(u)->state);
2742 }
2743
2744 const char* socket_port_type_to_string(SocketPort *p) {
2745
2746 assert(p);
2747
2748 switch (p->type) {
2749
2750 case SOCKET_SOCKET:
2751
2752 switch (p->address.type) {
2753
2754 case SOCK_STREAM:
2755 return "Stream";
2756
2757 case SOCK_DGRAM:
2758 return "Datagram";
2759
2760 case SOCK_SEQPACKET:
2761 return "SequentialPacket";
2762
2763 case SOCK_RAW:
2764 if (socket_address_family(&p->address) == AF_NETLINK)
2765 return "Netlink";
2766
2767 /* fall through */
2768 default:
2769 return NULL;
2770 }
2771
2772 case SOCKET_SPECIAL:
2773 return "Special";
2774
2775 case SOCKET_MQUEUE:
2776 return "MessageQueue";
2777
2778 case SOCKET_FIFO:
2779 return "FIFO";
2780
2781 case SOCKET_USB_FUNCTION:
2782 return "USBFunction";
2783
2784 default:
2785 return NULL;
2786 }
2787 }
2788
2789 _pure_ static bool socket_check_gc(Unit *u) {
2790 Socket *s = SOCKET(u);
2791
2792 assert(u);
2793
2794 return s->n_connections > 0;
2795 }
2796
2797 static int socket_accept_do(Socket *s, int fd) {
2798 int cfd;
2799
2800 assert(s);
2801 assert(fd >= 0);
2802
2803 for (;;) {
2804 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2805 if (cfd < 0) {
2806 if (errno == EINTR)
2807 continue;
2808
2809 return -errno;
2810 }
2811
2812 break;
2813 }
2814
2815 return cfd;
2816 }
2817
2818 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2819 _cleanup_close_pair_ int pair[2] = { -1, -1 };
2820 int cfd, r;
2821 pid_t pid;
2822
2823 assert(s);
2824 assert(p);
2825 assert(fd >= 0);
2826
2827 /* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
2828 * connection socket is also properly associated with the cgroup. */
2829
2830 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2831 goto shortcut;
2832
2833 r = bpf_firewall_supported();
2834 if (r < 0)
2835 return r;
2836 if (r == 0)
2837 goto shortcut;
2838
2839 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2840 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2841
2842 r = unit_fork_helper_process(UNIT(s), &pid);
2843 if (r < 0)
2844 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2845 if (r == 0) {
2846 /* Child */
2847
2848 pair[0] = safe_close(pair[0]);
2849
2850 cfd = socket_accept_do(s, fd);
2851 if (cfd < 0) {
2852 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2853 _exit(EXIT_FAILURE);
2854 }
2855
2856 r = send_one_fd(pair[1], cfd, 0);
2857 if (r < 0) {
2858 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
2859 _exit(EXIT_FAILURE);
2860 }
2861
2862 _exit(EXIT_SUCCESS);
2863 }
2864
2865 pair[1] = safe_close(pair[1]);
2866 cfd = receive_one_fd(pair[0], 0);
2867
2868 /* We synchronously wait for the helper, as it shouldn't be slow */
2869 r = wait_for_terminate_and_warn("accept-cgroup-helper", pid, false);
2870 if (r < 0) {
2871 safe_close(cfd);
2872 return r;
2873 }
2874
2875 if (cfd < 0)
2876 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
2877
2878 return cfd;
2879
2880 shortcut:
2881 cfd = socket_accept_do(s, fd);
2882 if (cfd < 0)
2883 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2884
2885 return cfd;
2886 }
2887
2888 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2889 SocketPort *p = userdata;
2890 int cfd = -1;
2891
2892 assert(p);
2893 assert(fd >= 0);
2894
2895 if (p->socket->state != SOCKET_LISTENING)
2896 return 0;
2897
2898 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2899
2900 if (revents != EPOLLIN) {
2901
2902 if (revents & EPOLLHUP)
2903 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.");
2904 else
2905 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2906 goto fail;
2907 }
2908
2909 if (p->socket->accept &&
2910 p->type == SOCKET_SOCKET &&
2911 socket_address_can_accept(&p->address)) {
2912
2913 cfd = socket_accept_in_cgroup(p->socket, p, fd);
2914 if (cfd < 0)
2915 goto fail;
2916
2917 socket_apply_socket_options(p->socket, cfd);
2918 }
2919
2920 socket_enter_running(p->socket, cfd);
2921 return 0;
2922
2923 fail:
2924 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2925 return 0;
2926 }
2927
2928 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2929 Socket *s = SOCKET(u);
2930 SocketResult f;
2931
2932 assert(s);
2933 assert(pid >= 0);
2934
2935 if (pid != s->control_pid)
2936 return;
2937
2938 s->control_pid = 0;
2939
2940 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
2941 f = SOCKET_SUCCESS;
2942 else if (code == CLD_EXITED)
2943 f = SOCKET_FAILURE_EXIT_CODE;
2944 else if (code == CLD_KILLED)
2945 f = SOCKET_FAILURE_SIGNAL;
2946 else if (code == CLD_DUMPED)
2947 f = SOCKET_FAILURE_CORE_DUMP;
2948 else
2949 assert_not_reached("Unknown sigchld code");
2950
2951 if (s->control_command) {
2952 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2953
2954 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
2955 f = SOCKET_SUCCESS;
2956 }
2957
2958 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2959 "Control process exited, code=%s status=%i",
2960 sigchld_code_to_string(code), status);
2961
2962 if (s->result == SOCKET_SUCCESS)
2963 s->result = f;
2964
2965 if (s->control_command &&
2966 s->control_command->command_next &&
2967 f == SOCKET_SUCCESS) {
2968
2969 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2970 socket_run_next(s);
2971 } else {
2972 s->control_command = NULL;
2973 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2974
2975 /* No further commands for this step, so let's figure
2976 * out what to do next */
2977
2978 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2979
2980 switch (s->state) {
2981
2982 case SOCKET_START_PRE:
2983 if (f == SOCKET_SUCCESS)
2984 socket_enter_start_chown(s);
2985 else
2986 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2987 break;
2988
2989 case SOCKET_START_CHOWN:
2990 if (f == SOCKET_SUCCESS)
2991 socket_enter_start_post(s);
2992 else
2993 socket_enter_stop_pre(s, f);
2994 break;
2995
2996 case SOCKET_START_POST:
2997 if (f == SOCKET_SUCCESS)
2998 socket_enter_listening(s);
2999 else
3000 socket_enter_stop_pre(s, f);
3001 break;
3002
3003 case SOCKET_STOP_PRE:
3004 case SOCKET_STOP_PRE_SIGTERM:
3005 case SOCKET_STOP_PRE_SIGKILL:
3006 socket_enter_stop_post(s, f);
3007 break;
3008
3009 case SOCKET_STOP_POST:
3010 case SOCKET_FINAL_SIGTERM:
3011 case SOCKET_FINAL_SIGKILL:
3012 socket_enter_dead(s, f);
3013 break;
3014
3015 default:
3016 assert_not_reached("Uh, control process died at wrong time.");
3017 }
3018 }
3019
3020 /* Notify clients about changed exit status */
3021 unit_add_to_dbus_queue(u);
3022 }
3023
3024 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3025 Socket *s = SOCKET(userdata);
3026
3027 assert(s);
3028 assert(s->timer_event_source == source);
3029
3030 switch (s->state) {
3031
3032 case SOCKET_START_PRE:
3033 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3034 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3035 break;
3036
3037 case SOCKET_START_CHOWN:
3038 case SOCKET_START_POST:
3039 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3040 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3041 break;
3042
3043 case SOCKET_STOP_PRE:
3044 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3045 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3046 break;
3047
3048 case SOCKET_STOP_PRE_SIGTERM:
3049 if (s->kill_context.send_sigkill) {
3050 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3051 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3052 } else {
3053 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3054 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3055 }
3056 break;
3057
3058 case SOCKET_STOP_PRE_SIGKILL:
3059 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3060 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3061 break;
3062
3063 case SOCKET_STOP_POST:
3064 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3065 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3066 break;
3067
3068 case SOCKET_FINAL_SIGTERM:
3069 if (s->kill_context.send_sigkill) {
3070 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3071 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3072 } else {
3073 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3074 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3075 }
3076 break;
3077
3078 case SOCKET_FINAL_SIGKILL:
3079 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3080 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3081 break;
3082
3083 default:
3084 assert_not_reached("Timeout at wrong time.");
3085 }
3086
3087 return 0;
3088 }
3089
3090 int socket_collect_fds(Socket *s, int **fds) {
3091 int *rfds, k = 0, n = 0;
3092 SocketPort *p;
3093
3094 assert(s);
3095 assert(fds);
3096
3097 /* Called from the service code for requesting our fds */
3098
3099 LIST_FOREACH(port, p, s->ports) {
3100 if (p->fd >= 0)
3101 n++;
3102 n += p->n_auxiliary_fds;
3103 }
3104
3105 if (n <= 0) {
3106 *fds = NULL;
3107 return 0;
3108 }
3109
3110 rfds = new(int, n);
3111 if (!rfds)
3112 return -ENOMEM;
3113
3114 LIST_FOREACH(port, p, s->ports) {
3115 int i;
3116
3117 if (p->fd >= 0)
3118 rfds[k++] = p->fd;
3119 for (i = 0; i < p->n_auxiliary_fds; ++i)
3120 rfds[k++] = p->auxiliary_fds[i];
3121 }
3122
3123 assert(k == n);
3124
3125 *fds = rfds;
3126 return n;
3127 }
3128
3129 static void socket_reset_failed(Unit *u) {
3130 Socket *s = SOCKET(u);
3131
3132 assert(s);
3133
3134 if (s->state == SOCKET_FAILED)
3135 socket_set_state(s, SOCKET_DEAD);
3136
3137 s->result = SOCKET_SUCCESS;
3138 }
3139
3140 void socket_connection_unref(Socket *s) {
3141 assert(s);
3142
3143 /* The service is dead. Yay!
3144 *
3145 * This is strictly for one-instance-per-connection
3146 * services. */
3147
3148 assert(s->n_connections > 0);
3149 s->n_connections--;
3150
3151 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3152 }
3153
3154 static void socket_trigger_notify(Unit *u, Unit *other) {
3155 Socket *s = SOCKET(u);
3156
3157 assert(u);
3158 assert(other);
3159
3160 /* Filter out invocations with bogus state */
3161 if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
3162 return;
3163
3164 /* Don't propagate state changes from the service if we are already down */
3165 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3166 return;
3167
3168 /* We don't care for the service state if we are in Accept=yes mode */
3169 if (s->accept)
3170 return;
3171
3172 /* Propagate start limit hit state */
3173 if (other->start_limit_hit) {
3174 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3175 return;
3176 }
3177
3178 /* Don't propagate anything if there's still a job queued */
3179 if (other->job)
3180 return;
3181
3182 if (IN_SET(SERVICE(other)->state,
3183 SERVICE_DEAD, SERVICE_FAILED,
3184 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3185 SERVICE_AUTO_RESTART))
3186 socket_enter_listening(s);
3187
3188 if (SERVICE(other)->state == SERVICE_RUNNING)
3189 socket_set_state(s, SOCKET_RUNNING);
3190 }
3191
3192 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3193 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
3194 }
3195
3196 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3197 Socket *s = SOCKET(u);
3198 usec_t t;
3199 int r;
3200
3201 if (!s->timer_event_source)
3202 return 0;
3203
3204 r = sd_event_source_get_time(s->timer_event_source, &t);
3205 if (r < 0)
3206 return r;
3207 if (t == USEC_INFINITY)
3208 return 0;
3209
3210 *timeout = t;
3211 return 1;
3212 }
3213
3214 char *socket_fdname(Socket *s) {
3215 assert(s);
3216
3217 /* Returns the name to use for $LISTEN_NAMES. If the user
3218 * didn't specify anything specifically, use the socket unit's
3219 * name as fallback. */
3220
3221 if (s->fdname)
3222 return s->fdname;
3223
3224 return UNIT(s)->id;
3225 }
3226
3227 static int socket_control_pid(Unit *u) {
3228 Socket *s = SOCKET(u);
3229
3230 assert(s);
3231
3232 return s->control_pid;
3233 }
3234
3235 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3236 [SOCKET_EXEC_START_PRE] = "StartPre",
3237 [SOCKET_EXEC_START_CHOWN] = "StartChown",
3238 [SOCKET_EXEC_START_POST] = "StartPost",
3239 [SOCKET_EXEC_STOP_PRE] = "StopPre",
3240 [SOCKET_EXEC_STOP_POST] = "StopPost"
3241 };
3242
3243 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3244
3245 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3246 [SOCKET_SUCCESS] = "success",
3247 [SOCKET_FAILURE_RESOURCES] = "resources",
3248 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3249 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3250 [SOCKET_FAILURE_SIGNAL] = "signal",
3251 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3252 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3253 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3254 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3255 };
3256
3257 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3258
3259 const UnitVTable socket_vtable = {
3260 .object_size = sizeof(Socket),
3261 .exec_context_offset = offsetof(Socket, exec_context),
3262 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3263 .kill_context_offset = offsetof(Socket, kill_context),
3264 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3265 .dynamic_creds_offset = offsetof(Socket, dynamic_creds),
3266
3267 .sections =
3268 "Unit\0"
3269 "Socket\0"
3270 "Install\0",
3271 .private_section = "Socket",
3272
3273 .init = socket_init,
3274 .done = socket_done,
3275 .load = socket_load,
3276
3277 .coldplug = socket_coldplug,
3278
3279 .dump = socket_dump,
3280
3281 .start = socket_start,
3282 .stop = socket_stop,
3283
3284 .kill = socket_kill,
3285
3286 .get_timeout = socket_get_timeout,
3287
3288 .serialize = socket_serialize,
3289 .deserialize_item = socket_deserialize_item,
3290 .distribute_fds = socket_distribute_fds,
3291
3292 .active_state = socket_active_state,
3293 .sub_state_to_string = socket_sub_state_to_string,
3294
3295 .check_gc = socket_check_gc,
3296
3297 .sigchld_event = socket_sigchld_event,
3298
3299 .trigger_notify = socket_trigger_notify,
3300
3301 .reset_failed = socket_reset_failed,
3302
3303 .control_pid = socket_control_pid,
3304
3305 .bus_vtable = bus_socket_vtable,
3306 .bus_set_property = bus_socket_set_property,
3307 .bus_commit_properties = bus_socket_commit_properties,
3308
3309 .status_message_formats = {
3310 /*.starting_stopping = {
3311 [0] = "Starting socket %s...",
3312 [1] = "Stopping socket %s...",
3313 },*/
3314 .finished_start_job = {
3315 [JOB_DONE] = "Listening on %s.",
3316 [JOB_FAILED] = "Failed to listen on %s.",
3317 [JOB_TIMEOUT] = "Timed out starting %s.",
3318 },
3319 .finished_stop_job = {
3320 [JOB_DONE] = "Closed %s.",
3321 [JOB_FAILED] = "Failed stopping %s.",
3322 [JOB_TIMEOUT] = "Timed out stopping %s.",
3323 },
3324 },
3325 };
Unnamed repository; edit this file 'description' to name the repository.