]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/socket.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #29122 from yuwata/network-allow-multiple-ipv6-null-addresses
[thirdparty/systemd.git] / src / core / socket.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <arpa/inet.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <mqueue.h>
7 #include <netinet/tcp.h>
8 #include <sys/epoll.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <linux/sctp.h>
12
13 #include "alloc-util.h"
14 #include "bpf-firewall.h"
15 #include "bus-error.h"
16 #include "bus-util.h"
17 #include "chase.h"
18 #include "constants.h"
19 #include "copy.h"
20 #include "dbus-socket.h"
21 #include "dbus-unit.h"
22 #include "errno-list.h"
23 #include "exit-status.h"
24 #include "fd-util.h"
25 #include "format-util.h"
26 #include "in-addr-util.h"
27 #include "io-util.h"
28 #include "ip-protocol-list.h"
29 #include "label-util.h"
30 #include "log.h"
31 #include "mkdir-label.h"
32 #include "parse-util.h"
33 #include "path-util.h"
34 #include "process-util.h"
35 #include "selinux-util.h"
36 #include "serialize.h"
37 #include "service.h"
38 #include "signal-util.h"
39 #include "smack-util.h"
40 #include "socket.h"
41 #include "socket-netlink.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48 #include "user-util.h"
49
50 struct SocketPeer {
51 unsigned n_ref;
52
53 Socket *socket;
54 union sockaddr_union peer;
55 socklen_t peer_salen;
56 };
57
58 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
59 [SOCKET_DEAD] = UNIT_INACTIVE,
60 [SOCKET_START_PRE] = UNIT_ACTIVATING,
61 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
62 [SOCKET_START_POST] = UNIT_ACTIVATING,
63 [SOCKET_LISTENING] = UNIT_ACTIVE,
64 [SOCKET_RUNNING] = UNIT_ACTIVE,
65 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
66 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
67 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
68 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
69 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
70 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
71 [SOCKET_FAILED] = UNIT_FAILED,
72 [SOCKET_CLEANING] = UNIT_MAINTENANCE,
73 };
74
75 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
76 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
77 static void flush_ports(Socket *s);
78
79 static void socket_init(Unit *u) {
80 Socket *s = SOCKET(u);
81
82 assert(u);
83 assert(u->load_state == UNIT_STUB);
84
85 s->backlog = SOMAXCONN_DELUXE;
86 s->timeout_usec = u->manager->defaults.timeout_start_usec;
87 s->directory_mode = 0755;
88 s->socket_mode = 0666;
89
90 s->max_connections = 64;
91
92 s->priority = -1;
93 s->ip_tos = -1;
94 s->ip_ttl = -1;
95 s->mark = -1;
96
97 s->exec_context.std_output = u->manager->defaults.std_output;
98 s->exec_context.std_error = u->manager->defaults.std_error;
99
100 s->control_pid = PIDREF_NULL;
101 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
102
103 s->trigger_limit.interval = USEC_INFINITY;
104 s->trigger_limit.burst = UINT_MAX;
105
106 s->poll_limit_interval = USEC_INFINITY;
107 s->poll_limit_burst = UINT_MAX;
108 }
109
110 static void socket_unwatch_control_pid(Socket *s) {
111 assert(s);
112
113 if (!pidref_is_set(&s->control_pid))
114 return;
115
116 unit_unwatch_pid(UNIT(s), s->control_pid.pid);
117 pidref_done(&s->control_pid);
118 }
119
120 static void socket_cleanup_fd_list(SocketPort *p) {
121 assert(p);
122
123 close_many(p->auxiliary_fds, p->n_auxiliary_fds);
124 p->auxiliary_fds = mfree(p->auxiliary_fds);
125 p->n_auxiliary_fds = 0;
126 }
127
128 SocketPort *socket_port_free(SocketPort *p) {
129 if (!p)
130 return NULL;
131
132 sd_event_source_unref(p->event_source);
133
134 socket_cleanup_fd_list(p);
135 safe_close(p->fd);
136 free(p->path);
137
138 return mfree(p);
139 }
140
141 void socket_free_ports(Socket *s) {
142 assert(s);
143
144 LIST_CLEAR(port, s->ports, socket_port_free);
145 }
146
147 static void socket_done(Unit *u) {
148 Socket *s = SOCKET(u);
149 SocketPeer *p;
150
151 assert(s);
152
153 socket_free_ports(s);
154
155 while ((p = set_steal_first(s->peers_by_address)))
156 p->socket = NULL;
157
158 s->peers_by_address = set_free(s->peers_by_address);
159
160 s->exec_runtime = exec_runtime_free(s->exec_runtime);
161 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
162 s->control_command = NULL;
163
164 socket_unwatch_control_pid(s);
165
166 unit_ref_unset(&s->service);
167
168 s->tcp_congestion = mfree(s->tcp_congestion);
169 s->bind_to_device = mfree(s->bind_to_device);
170
171 s->smack = mfree(s->smack);
172 s->smack_ip_in = mfree(s->smack_ip_in);
173 s->smack_ip_out = mfree(s->smack_ip_out);
174
175 strv_free(s->symlinks);
176
177 s->user = mfree(s->user);
178 s->group = mfree(s->group);
179
180 s->fdname = mfree(s->fdname);
181
182 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
183 }
184
185 static int socket_arm_timer(Socket *s, usec_t usec) {
186 int r;
187
188 assert(s);
189
190 if (s->timer_event_source) {
191 r = sd_event_source_set_time(s->timer_event_source, usec);
192 if (r < 0)
193 return r;
194
195 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
196 }
197
198 if (usec == USEC_INFINITY)
199 return 0;
200
201 r = sd_event_add_time(
202 UNIT(s)->manager->event,
203 &s->timer_event_source,
204 CLOCK_MONOTONIC,
205 usec, 0,
206 socket_dispatch_timer, s);
207 if (r < 0)
208 return r;
209
210 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
211
212 return 0;
213 }
214
215 static bool have_non_accept_socket(Socket *s) {
216 assert(s);
217
218 if (!s->accept)
219 return true;
220
221 LIST_FOREACH(port, p, s->ports) {
222
223 if (p->type != SOCKET_SOCKET)
224 return true;
225
226 if (!socket_address_can_accept(&p->address))
227 return true;
228 }
229
230 return false;
231 }
232
233 static int socket_add_mount_dependencies(Socket *s) {
234 int r;
235
236 assert(s);
237
238 LIST_FOREACH(port, p, s->ports) {
239 const char *path = NULL;
240
241 if (p->type == SOCKET_SOCKET)
242 path = socket_address_get_path(&p->address);
243 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
244 path = p->path;
245
246 if (!path)
247 continue;
248
249 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
250 if (r < 0)
251 return r;
252 }
253
254 return 0;
255 }
256
257 static int socket_add_device_dependencies(Socket *s) {
258 char *t;
259
260 assert(s);
261
262 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
263 return 0;
264
265 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
266 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
267 }
268
269 static int socket_add_default_dependencies(Socket *s) {
270 int r;
271 assert(s);
272
273 if (!UNIT(s)->default_dependencies)
274 return 0;
275
276 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
277 if (r < 0)
278 return r;
279
280 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
281 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
282 if (r < 0)
283 return r;
284 }
285
286 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
287 }
288
289 static bool socket_has_exec(Socket *s) {
290 unsigned i;
291 assert(s);
292
293 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
294 if (s->exec_command[i])
295 return true;
296
297 return false;
298 }
299
300 static int socket_add_extras(Socket *s) {
301 Unit *u = UNIT(s);
302 int r;
303
304 assert(s);
305
306 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
307 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
308 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
309 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
310 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
311 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
312 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
313 * service starts are typical.
314 *
315 * For the poll limit we follow a similar rule, but use 3/4th of the trigger limit parameters, to
316 * trigger this earlier. */
317
318 if (s->trigger_limit.interval == USEC_INFINITY)
319 s->trigger_limit.interval = 2 * USEC_PER_SEC;
320 if (s->trigger_limit.burst == UINT_MAX)
321 s->trigger_limit.burst = s->accept ? 200 : 20;
322
323 if (s->poll_limit_interval == USEC_INFINITY)
324 s->poll_limit_interval = 2 * USEC_PER_SEC;
325 if (s->poll_limit_burst == UINT_MAX)
326 s->poll_limit_burst = s->accept ? 150 : 15;
327
328 if (have_non_accept_socket(s)) {
329
330 if (!UNIT_DEREF(s->service)) {
331 Unit *x;
332
333 r = unit_load_related_unit(u, ".service", &x);
334 if (r < 0)
335 return r;
336
337 unit_ref_set(&s->service, u, x);
338 }
339
340 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
341 if (r < 0)
342 return r;
343 }
344
345 r = socket_add_mount_dependencies(s);
346 if (r < 0)
347 return r;
348
349 r = socket_add_device_dependencies(s);
350 if (r < 0)
351 return r;
352
353 r = unit_patch_contexts(u);
354 if (r < 0)
355 return r;
356
357 if (socket_has_exec(s)) {
358 r = unit_add_exec_dependencies(u, &s->exec_context);
359 if (r < 0)
360 return r;
361 }
362
363 r = unit_set_default_slice(u);
364 if (r < 0)
365 return r;
366
367 r = socket_add_default_dependencies(s);
368 if (r < 0)
369 return r;
370
371 return 0;
372 }
373
374 static const char *socket_find_symlink_target(Socket *s) {
375 const char *found = NULL;
376
377 LIST_FOREACH(port, p, s->ports) {
378 const char *f = NULL;
379
380 switch (p->type) {
381
382 case SOCKET_FIFO:
383 f = p->path;
384 break;
385
386 case SOCKET_SOCKET:
387 f = socket_address_get_path(&p->address);
388 break;
389
390 default:
391 break;
392 }
393
394 if (f) {
395 if (found)
396 return NULL;
397
398 found = f;
399 }
400 }
401
402 return found;
403 }
404
405 static int socket_verify(Socket *s) {
406 assert(s);
407 assert(UNIT(s)->load_state == UNIT_LOADED);
408
409 if (!s->ports)
410 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
411
412 if (s->accept && have_non_accept_socket(s))
413 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
414
415 if (s->accept && s->max_connections <= 0)
416 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
417
418 if (s->accept && UNIT_DEREF(s->service))
419 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
420
421 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
422 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
423
424 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
425 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
426
427 return 0;
428 }
429
430 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
431 assert(s);
432
433 if (s->peer.sa.sa_family == AF_INET)
434 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
435 else if (s->peer.sa.sa_family == AF_INET6)
436 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
437 else if (s->peer.sa.sa_family == AF_VSOCK)
438 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
439 else
440 assert_not_reached();
441 }
442
443 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
444 int r;
445
446 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
447 if (r != 0)
448 return r;
449
450 switch (x->peer.sa.sa_family) {
451 case AF_INET:
452 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
453 case AF_INET6:
454 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
455 case AF_VSOCK:
456 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
457 }
458 assert_not_reached();
459 }
460
461 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
462
463 static int socket_load(Unit *u) {
464 Socket *s = SOCKET(u);
465 int r;
466
467 assert(u);
468 assert(u->load_state == UNIT_STUB);
469
470 r = unit_load_fragment_and_dropin(u, true);
471 if (r < 0)
472 return r;
473
474 if (u->load_state != UNIT_LOADED)
475 return 0;
476
477 /* This is a new unit? Then let's add in some extras */
478 r = socket_add_extras(s);
479 if (r < 0)
480 return r;
481
482 return socket_verify(s);
483 }
484
485 static SocketPeer *socket_peer_new(void) {
486 SocketPeer *p;
487
488 p = new(SocketPeer, 1);
489 if (!p)
490 return NULL;
491
492 *p = (SocketPeer) {
493 .n_ref = 1,
494 };
495 return p;
496 }
497
498 static SocketPeer *socket_peer_free(SocketPeer *p) {
499 assert(p);
500
501 if (p->socket)
502 set_remove(p->socket->peers_by_address, p);
503
504 return mfree(p);
505 }
506
507 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
508
509 int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
510 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
511 SocketPeer sa = {
512 .peer_salen = sizeof(union sockaddr_union),
513 }, *i;
514 int r;
515
516 assert(fd >= 0);
517 assert(s);
518
519 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
520 return log_unit_error_errno(UNIT(s), errno, "getpeername failed: %m");
521
522 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
523 *p = NULL;
524 return 0;
525 }
526
527 r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
528 if (r < 0)
529 return r;
530
531 i = set_get(s->peers_by_address, &sa);
532 if (i) {
533 *p = socket_peer_ref(i);
534 return 1;
535 }
536
537 remote = socket_peer_new();
538 if (!remote)
539 return log_oom();
540
541 remote->peer = sa.peer;
542 remote->peer_salen = sa.peer_salen;
543
544 r = set_put(s->peers_by_address, remote);
545 if (r < 0)
546 return r;
547
548 remote->socket = s;
549
550 *p = TAKE_PTR(remote);
551 return 1;
552 }
553
554 static const char* listen_lookup(int family, int type) {
555
556 if (family == AF_NETLINK)
557 return "ListenNetlink";
558
559 if (type == SOCK_STREAM)
560 return "ListenStream";
561 else if (type == SOCK_DGRAM)
562 return "ListenDatagram";
563 else if (type == SOCK_SEQPACKET)
564 return "ListenSequentialPacket";
565
566 assert_not_reached();
567 return NULL;
568 }
569
570 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
571 Socket *s = SOCKET(u);
572 const char *prefix2, *str;
573
574 assert(s);
575 assert(f);
576
577 prefix = strempty(prefix);
578 prefix2 = strjoina(prefix, "\t");
579
580 fprintf(f,
581 "%sSocket State: %s\n"
582 "%sResult: %s\n"
583 "%sClean Result: %s\n"
584 "%sBindIPv6Only: %s\n"
585 "%sBacklog: %u\n"
586 "%sSocketMode: %04o\n"
587 "%sDirectoryMode: %04o\n"
588 "%sKeepAlive: %s\n"
589 "%sNoDelay: %s\n"
590 "%sFreeBind: %s\n"
591 "%sTransparent: %s\n"
592 "%sBroadcast: %s\n"
593 "%sPassCredentials: %s\n"
594 "%sPassSecurity: %s\n"
595 "%sPassPacketInfo: %s\n"
596 "%sTCPCongestion: %s\n"
597 "%sRemoveOnStop: %s\n"
598 "%sWritable: %s\n"
599 "%sFileDescriptorName: %s\n"
600 "%sSELinuxContextFromNet: %s\n",
601 prefix, socket_state_to_string(s->state),
602 prefix, socket_result_to_string(s->result),
603 prefix, socket_result_to_string(s->clean_result),
604 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
605 prefix, s->backlog,
606 prefix, s->socket_mode,
607 prefix, s->directory_mode,
608 prefix, yes_no(s->keep_alive),
609 prefix, yes_no(s->no_delay),
610 prefix, yes_no(s->free_bind),
611 prefix, yes_no(s->transparent),
612 prefix, yes_no(s->broadcast),
613 prefix, yes_no(s->pass_cred),
614 prefix, yes_no(s->pass_sec),
615 prefix, yes_no(s->pass_pktinfo),
616 prefix, strna(s->tcp_congestion),
617 prefix, yes_no(s->remove_on_stop),
618 prefix, yes_no(s->writable),
619 prefix, socket_fdname(s),
620 prefix, yes_no(s->selinux_context_from_net));
621
622 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
623 fprintf(f,
624 "%sTimestamping: %s\n",
625 prefix, socket_timestamping_to_string(s->timestamping));
626
627 if (pidref_is_set(&s->control_pid))
628 fprintf(f,
629 "%sControl PID: "PID_FMT"\n",
630 prefix, s->control_pid.pid);
631
632 if (s->bind_to_device)
633 fprintf(f,
634 "%sBindToDevice: %s\n",
635 prefix, s->bind_to_device);
636
637 if (s->accept)
638 fprintf(f,
639 "%sAccepted: %u\n"
640 "%sNConnections: %u\n"
641 "%sMaxConnections: %u\n"
642 "%sMaxConnectionsPerSource: %u\n",
643 prefix, s->n_accepted,
644 prefix, s->n_connections,
645 prefix, s->max_connections,
646 prefix, s->max_connections_per_source);
647 else
648 fprintf(f,
649 "%sFlushPending: %s\n",
650 prefix, yes_no(s->flush_pending));
651
652
653 if (s->priority >= 0)
654 fprintf(f,
655 "%sPriority: %i\n",
656 prefix, s->priority);
657
658 if (s->receive_buffer > 0)
659 fprintf(f,
660 "%sReceiveBuffer: %zu\n",
661 prefix, s->receive_buffer);
662
663 if (s->send_buffer > 0)
664 fprintf(f,
665 "%sSendBuffer: %zu\n",
666 prefix, s->send_buffer);
667
668 if (s->ip_tos >= 0)
669 fprintf(f,
670 "%sIPTOS: %i\n",
671 prefix, s->ip_tos);
672
673 if (s->ip_ttl >= 0)
674 fprintf(f,
675 "%sIPTTL: %i\n",
676 prefix, s->ip_ttl);
677
678 if (s->pipe_size > 0)
679 fprintf(f,
680 "%sPipeSize: %zu\n",
681 prefix, s->pipe_size);
682
683 if (s->mark >= 0)
684 fprintf(f,
685 "%sMark: %i\n",
686 prefix, s->mark);
687
688 if (s->mq_maxmsg > 0)
689 fprintf(f,
690 "%sMessageQueueMaxMessages: %li\n",
691 prefix, s->mq_maxmsg);
692
693 if (s->mq_msgsize > 0)
694 fprintf(f,
695 "%sMessageQueueMessageSize: %li\n",
696 prefix, s->mq_msgsize);
697
698 if (s->reuse_port)
699 fprintf(f,
700 "%sReusePort: %s\n",
701 prefix, yes_no(s->reuse_port));
702
703 if (s->smack)
704 fprintf(f,
705 "%sSmackLabel: %s\n",
706 prefix, s->smack);
707
708 if (s->smack_ip_in)
709 fprintf(f,
710 "%sSmackLabelIPIn: %s\n",
711 prefix, s->smack_ip_in);
712
713 if (s->smack_ip_out)
714 fprintf(f,
715 "%sSmackLabelIPOut: %s\n",
716 prefix, s->smack_ip_out);
717
718 if (!isempty(s->user) || !isempty(s->group))
719 fprintf(f,
720 "%sSocketUser: %s\n"
721 "%sSocketGroup: %s\n",
722 prefix, strna(s->user),
723 prefix, strna(s->group));
724
725 if (timestamp_is_set(s->keep_alive_time))
726 fprintf(f,
727 "%sKeepAliveTimeSec: %s\n",
728 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
729
730 if (s->keep_alive_interval > 0)
731 fprintf(f,
732 "%sKeepAliveIntervalSec: %s\n",
733 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
734
735 if (s->keep_alive_cnt > 0)
736 fprintf(f,
737 "%sKeepAliveProbes: %u\n",
738 prefix, s->keep_alive_cnt);
739
740 if (s->defer_accept > 0)
741 fprintf(f,
742 "%sDeferAcceptSec: %s\n",
743 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
744
745 LIST_FOREACH(port, p, s->ports) {
746
747 switch (p->type) {
748 case SOCKET_SOCKET: {
749 _cleanup_free_ char *k = NULL;
750 int r;
751
752 r = socket_address_print(&p->address, &k);
753 if (r < 0) {
754 errno = -r;
755 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
756 } else
757 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
758 break;
759 }
760 case SOCKET_SPECIAL:
761 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
762 break;
763 case SOCKET_USB_FUNCTION:
764 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
765 break;
766 case SOCKET_MQUEUE:
767 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
768 break;
769 default:
770 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
771 }
772 }
773
774 fprintf(f,
775 "%sTriggerLimitIntervalSec: %s\n"
776 "%sTriggerLimitBurst: %u\n"
777 "%sPollLimitIntervalSec: %s\n"
778 "%sPollLimitBurst: %u\n",
779 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
780 prefix, s->trigger_limit.burst,
781 prefix, FORMAT_TIMESPAN(s->poll_limit_interval, USEC_PER_SEC),
782 prefix, s->poll_limit_burst);
783
784 str = ip_protocol_to_name(s->socket_protocol);
785 if (str)
786 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
787
788 if (!strv_isempty(s->symlinks)) {
789 fprintf(f, "%sSymlinks:", prefix);
790 STRV_FOREACH(q, s->symlinks)
791 fprintf(f, " %s", *q);
792
793 fprintf(f, "\n");
794 }
795
796 fprintf(f,
797 "%sTimeoutSec: %s\n",
798 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
799
800 exec_context_dump(&s->exec_context, f, prefix);
801 kill_context_dump(&s->kill_context, f, prefix);
802
803 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
804 if (!s->exec_command[c])
805 continue;
806
807 fprintf(f, "%s-> %s:\n",
808 prefix, socket_exec_command_to_string(c));
809
810 exec_command_dump_list(s->exec_command[c], f, prefix2);
811 }
812
813 cgroup_context_dump(UNIT(s), f, prefix);
814 }
815
816 static int instance_from_socket(int fd, unsigned nr, char **instance) {
817 socklen_t l;
818 char *r;
819 union sockaddr_union local, remote;
820
821 assert(fd >= 0);
822 assert(instance);
823
824 l = sizeof(local);
825 if (getsockname(fd, &local.sa, &l) < 0)
826 return -errno;
827
828 l = sizeof(remote);
829 if (getpeername(fd, &remote.sa, &l) < 0)
830 return -errno;
831
832 switch (local.sa.sa_family) {
833
834 case AF_INET: {
835 uint32_t
836 a = be32toh(local.in.sin_addr.s_addr),
837 b = be32toh(remote.in.sin_addr.s_addr);
838
839 if (asprintf(&r,
840 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
841 nr,
842 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
843 be16toh(local.in.sin_port),
844 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
845 be16toh(remote.in.sin_port)) < 0)
846 return -ENOMEM;
847
848 break;
849 }
850
851 case AF_INET6: {
852 static const unsigned char ipv4_prefix[] = {
853 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
854 };
855
856 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
857 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
858 const uint8_t
859 *a = local.in6.sin6_addr.s6_addr+12,
860 *b = remote.in6.sin6_addr.s6_addr+12;
861
862 if (asprintf(&r,
863 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
864 nr,
865 a[0], a[1], a[2], a[3],
866 be16toh(local.in6.sin6_port),
867 b[0], b[1], b[2], b[3],
868 be16toh(remote.in6.sin6_port)) < 0)
869 return -ENOMEM;
870 } else {
871 if (asprintf(&r,
872 "%u-%s:%u-%s:%u",
873 nr,
874 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
875 be16toh(local.in6.sin6_port),
876 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
877 be16toh(remote.in6.sin6_port)) < 0)
878 return -ENOMEM;
879 }
880
881 break;
882 }
883
884 case AF_UNIX: {
885 struct ucred ucred;
886 int k;
887
888 k = getpeercred(fd, &ucred);
889 if (k >= 0) {
890 if (asprintf(&r,
891 "%u-"PID_FMT"-"UID_FMT,
892 nr, ucred.pid, ucred.uid) < 0)
893 return -ENOMEM;
894 } else if (k == -ENODATA) {
895 /* This handles the case where somebody is
896 * connecting from another pid/uid namespace
897 * (e.g. from outside of our container). */
898 if (asprintf(&r,
899 "%u-unknown",
900 nr) < 0)
901 return -ENOMEM;
902 } else
903 return k;
904
905 break;
906 }
907
908 case AF_VSOCK:
909 if (asprintf(&r,
910 "%u-%u:%u-%u:%u",
911 nr,
912 local.vm.svm_cid, local.vm.svm_port,
913 remote.vm.svm_cid, remote.vm.svm_port) < 0)
914 return -ENOMEM;
915
916 break;
917
918 default:
919 assert_not_reached();
920 }
921
922 *instance = r;
923 return 0;
924 }
925
926 static void socket_close_fds(Socket *s) {
927 assert(s);
928
929 LIST_FOREACH(port, p, s->ports) {
930 bool was_open;
931
932 was_open = p->fd >= 0;
933
934 p->event_source = sd_event_source_disable_unref(p->event_source);
935 p->fd = safe_close(p->fd);
936 socket_cleanup_fd_list(p);
937
938 /* One little note: we should normally not delete any sockets in the file system here! After all some
939 * other process we spawned might still have a reference of this fd and wants to continue to use
940 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
941 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
942 * anyway, but only then. */
943
944 if (!was_open || !s->remove_on_stop)
945 continue;
946
947 switch (p->type) {
948
949 case SOCKET_FIFO:
950 (void) unlink(p->path);
951 break;
952
953 case SOCKET_MQUEUE:
954 (void) mq_unlink(p->path);
955 break;
956
957 case SOCKET_SOCKET:
958 (void) socket_address_unlink(&p->address);
959 break;
960
961 default:
962 break;
963 }
964 }
965
966 if (s->remove_on_stop)
967 STRV_FOREACH(i, s->symlinks)
968 (void) unlink(*i);
969
970 /* Note that we don't return NULL here, since s has not been freed. */
971 }
972
973 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
974 int r;
975
976 assert(s);
977 assert(p);
978 assert(fd >= 0);
979
980 if (s->keep_alive) {
981 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
982 if (r < 0)
983 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
984 }
985
986 if (timestamp_is_set(s->keep_alive_time)) {
987 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
988 if (r < 0)
989 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
990 }
991
992 if (s->keep_alive_interval > 0) {
993 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
994 if (r < 0)
995 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
996 }
997
998 if (s->keep_alive_cnt > 0) {
999 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
1000 if (r < 0)
1001 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
1002 }
1003
1004 if (s->defer_accept > 0) {
1005 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
1006 if (r < 0)
1007 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
1008 }
1009
1010 if (s->no_delay) {
1011 if (s->socket_protocol == IPPROTO_SCTP) {
1012 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
1013 if (r < 0)
1014 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
1015 } else {
1016 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
1017 if (r < 0)
1018 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
1019 }
1020 }
1021
1022 if (s->broadcast) {
1023 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
1024 if (r < 0)
1025 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
1026 }
1027
1028 if (s->pass_cred) {
1029 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1030 if (r < 0)
1031 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1032 }
1033
1034 if (s->pass_sec) {
1035 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1036 if (r < 0)
1037 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1038 }
1039
1040 if (s->pass_pktinfo) {
1041 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1042 if (r < 0)
1043 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1044 }
1045
1046 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1047 r = setsockopt_int(fd, SOL_SOCKET,
1048 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1049 true);
1050 if (r < 0)
1051 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1052 }
1053
1054 if (s->priority >= 0) {
1055 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1056 if (r < 0)
1057 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1058 }
1059
1060 if (s->receive_buffer > 0) {
1061 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1062 if (r < 0)
1063 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1064 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1065 }
1066
1067 if (s->send_buffer > 0) {
1068 r = fd_set_sndbuf(fd, s->send_buffer, false);
1069 if (r < 0)
1070 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1071 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1072 }
1073
1074 if (s->mark >= 0) {
1075 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1076 if (r < 0)
1077 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1078 }
1079
1080 if (s->ip_tos >= 0) {
1081 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1082 if (r < 0)
1083 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1084 }
1085
1086 if (s->ip_ttl >= 0) {
1087 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1088 if (r < 0)
1089 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1090 }
1091
1092 if (s->tcp_congestion)
1093 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1094 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1095
1096 if (s->smack_ip_in) {
1097 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1098 if (r < 0)
1099 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1100 }
1101
1102 if (s->smack_ip_out) {
1103 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1104 if (r < 0)
1105 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1106 }
1107 }
1108
1109 static void socket_apply_fifo_options(Socket *s, int fd) {
1110 int r;
1111
1112 assert(s);
1113 assert(fd >= 0);
1114
1115 if (s->pipe_size > 0)
1116 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1117 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1118
1119 if (s->smack) {
1120 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1121 if (r < 0)
1122 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1123 }
1124 }
1125
1126 static int fifo_address_create(
1127 const char *path,
1128 mode_t directory_mode,
1129 mode_t socket_mode) {
1130
1131 _cleanup_close_ int fd = -EBADF;
1132 mode_t old_mask;
1133 struct stat st;
1134 int r;
1135
1136 assert(path);
1137
1138 (void) mkdir_parents_label(path, directory_mode);
1139
1140 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1141 if (r < 0)
1142 return r;
1143
1144 /* Enforce the right access mode for the fifo */
1145 old_mask = umask(~socket_mode);
1146
1147 /* Include the original umask in our mask */
1148 (void) umask(~socket_mode | old_mask);
1149
1150 r = mkfifo(path, socket_mode);
1151 (void) umask(old_mask);
1152
1153 if (r < 0 && errno != EEXIST) {
1154 r = -errno;
1155 goto fail;
1156 }
1157
1158 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1159 if (fd < 0) {
1160 r = -errno;
1161 goto fail;
1162 }
1163
1164 mac_selinux_create_file_clear();
1165
1166 if (fstat(fd, &st) < 0) {
1167 r = -errno;
1168 goto fail;
1169 }
1170
1171 if (!S_ISFIFO(st.st_mode) ||
1172 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1173 st.st_uid != getuid() ||
1174 st.st_gid != getgid()) {
1175 r = -EEXIST;
1176 goto fail;
1177 }
1178
1179 return TAKE_FD(fd);
1180
1181 fail:
1182 mac_selinux_create_file_clear();
1183 return r;
1184 }
1185
1186 static int special_address_create(const char *path, bool writable) {
1187 _cleanup_close_ int fd = -EBADF;
1188 struct stat st;
1189
1190 assert(path);
1191
1192 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1193 if (fd < 0)
1194 return -errno;
1195
1196 if (fstat(fd, &st) < 0)
1197 return -errno;
1198
1199 /* Check whether this is a /proc, /sys or /dev file or char device */
1200 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1201 return -EEXIST;
1202
1203 return TAKE_FD(fd);
1204 }
1205
1206 static int usbffs_address_create(const char *path) {
1207 _cleanup_close_ int fd = -EBADF;
1208 struct stat st;
1209
1210 assert(path);
1211
1212 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1213 if (fd < 0)
1214 return -errno;
1215
1216 if (fstat(fd, &st) < 0)
1217 return -errno;
1218
1219 /* Check whether this is a regular file (ffs endpoint) */
1220 if (!S_ISREG(st.st_mode))
1221 return -EEXIST;
1222
1223 return TAKE_FD(fd);
1224 }
1225
1226 static int mq_address_create(
1227 const char *path,
1228 mode_t mq_mode,
1229 long maxmsg,
1230 long msgsize) {
1231
1232 _cleanup_close_ int fd = -EBADF;
1233 struct stat st;
1234 mode_t old_mask;
1235 struct mq_attr _attr, *attr = NULL;
1236
1237 assert(path);
1238
1239 if (maxmsg > 0 && msgsize > 0) {
1240 _attr = (struct mq_attr) {
1241 .mq_flags = O_NONBLOCK,
1242 .mq_maxmsg = maxmsg,
1243 .mq_msgsize = msgsize,
1244 };
1245 attr = &_attr;
1246 }
1247
1248 /* Enforce the right access mode for the mq */
1249 old_mask = umask(~mq_mode);
1250
1251 /* Include the original umask in our mask */
1252 (void) umask(~mq_mode | old_mask);
1253 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1254 (void) umask(old_mask);
1255
1256 if (fd < 0)
1257 return -errno;
1258
1259 if (fstat(fd, &st) < 0)
1260 return -errno;
1261
1262 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1263 st.st_uid != getuid() ||
1264 st.st_gid != getgid())
1265 return -EEXIST;
1266
1267 return TAKE_FD(fd);
1268 }
1269
1270 static int socket_symlink(Socket *s) {
1271 const char *p;
1272 int r;
1273
1274 assert(s);
1275
1276 p = socket_find_symlink_target(s);
1277 if (!p)
1278 return 0;
1279
1280 STRV_FOREACH(i, s->symlinks) {
1281 (void) mkdir_parents_label(*i, s->directory_mode);
1282
1283 r = symlink_idempotent(p, *i, false);
1284
1285 if (r == -EEXIST && s->remove_on_stop) {
1286 /* If there's already something where we want to create the symlink, and the destructive
1287 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1288 * again. */
1289
1290 if (unlink(*i) >= 0)
1291 r = symlink_idempotent(p, *i, false);
1292 }
1293
1294 if (r < 0)
1295 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1296 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1297 }
1298
1299 return 0;
1300 }
1301
1302 static int usbffs_write_descs(int fd, Service *s) {
1303 int r;
1304
1305 if (!s->usb_function_descriptors || !s->usb_function_strings)
1306 return -EINVAL;
1307
1308 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1309 if (r < 0)
1310 return r;
1311
1312 return copy_file_fd(s->usb_function_strings, fd, 0);
1313 }
1314
1315 static int usbffs_select_ep(const struct dirent *d) {
1316 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1317 }
1318
1319 static int usbffs_dispatch_eps(SocketPort *p) {
1320 _cleanup_free_ struct dirent **ent = NULL;
1321 size_t n, k;
1322 int r;
1323
1324 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1325 if (r < 0)
1326 return -errno;
1327
1328 n = (size_t) r;
1329 p->auxiliary_fds = new(int, n);
1330 if (!p->auxiliary_fds) {
1331 r = -ENOMEM;
1332 goto clear;
1333 }
1334
1335 p->n_auxiliary_fds = n;
1336
1337 k = 0;
1338 for (size_t i = 0; i < n; ++i) {
1339 _cleanup_free_ char *ep = NULL;
1340
1341 ep = path_make_absolute(ent[i]->d_name, p->path);
1342 if (!ep) {
1343 r = -ENOMEM;
1344 goto fail;
1345 }
1346
1347 path_simplify(ep);
1348
1349 r = usbffs_address_create(ep);
1350 if (r < 0)
1351 goto fail;
1352
1353 p->auxiliary_fds[k++] = r;
1354 }
1355
1356 r = 0;
1357 goto clear;
1358
1359 fail:
1360 close_many(p->auxiliary_fds, k);
1361 p->auxiliary_fds = mfree(p->auxiliary_fds);
1362 p->n_auxiliary_fds = 0;
1363
1364 clear:
1365 free_many((void**) ent, n);
1366 return r;
1367 }
1368
1369 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1370 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1371 *
1372 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1373 * instance name.
1374 */
1375
1376 if (UNIT_ISSET(s->service)) {
1377 *ret = UNIT_DEREF(s->service);
1378 return 0;
1379 }
1380
1381 if (!s->accept)
1382 return -ENODATA;
1383
1384 /* Build the instance name and load the unit */
1385 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1386 int r;
1387
1388 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1389 if (r < 0)
1390 return r;
1391
1392 if (cfd >= 0) {
1393 r = instance_from_socket(cfd, s->n_accepted, &instance);
1394 if (r < 0) {
1395 if (ERRNO_IS_DISCONNECT(r))
1396 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1397 * different errors. This connection is over, but the socket unit lives on. */
1398 return log_unit_debug_errno(UNIT(s), r,
1399 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1400 errno_to_name(r));
1401 return r;
1402 }
1403 }
1404
1405 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1406 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1407 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1408 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1409 if (r < 0)
1410 return r;
1411
1412 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1413 }
1414
1415 static int socket_determine_selinux_label(Socket *s, char **ret) {
1416 int r;
1417
1418 assert(s);
1419 assert(ret);
1420
1421 Unit *service;
1422 ExecCommand *c;
1423 const char *exec_context;
1424 _cleanup_free_ char *path = NULL;
1425
1426 r = socket_load_service_unit(s, -1, &service);
1427 if (r == -ENODATA)
1428 goto no_label;
1429 if (r < 0)
1430 return r;
1431
1432 exec_context = SERVICE(service)->exec_context.selinux_context;
1433 if (exec_context) {
1434 char *con;
1435
1436 con = strdup(exec_context);
1437 if (!con)
1438 return -ENOMEM;
1439
1440 *ret = TAKE_PTR(con);
1441 return 0;
1442 }
1443
1444 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1445 if (!c)
1446 goto no_label;
1447
1448 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1449 if (r < 0)
1450 goto no_label;
1451
1452 r = mac_selinux_get_create_label_from_exe(path, ret);
1453 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1454 goto no_label;
1455 return r;
1456
1457 no_label:
1458 *ret = NULL;
1459 return 0;
1460 }
1461
1462 static int socket_address_listen_do(
1463 Socket *s,
1464 const SocketAddress *address,
1465 const char *label) {
1466
1467 assert(s);
1468 assert(address);
1469
1470 return socket_address_listen(
1471 address,
1472 SOCK_CLOEXEC|SOCK_NONBLOCK,
1473 s->backlog,
1474 s->bind_ipv6_only,
1475 s->bind_to_device,
1476 s->reuse_port,
1477 s->free_bind,
1478 s->transparent,
1479 s->directory_mode,
1480 s->socket_mode,
1481 label);
1482 }
1483
1484 #define log_address_error_errno(u, address, error, fmt) \
1485 ({ \
1486 _cleanup_free_ char *_t = NULL; \
1487 \
1488 (void) socket_address_print(address, &_t); \
1489 log_unit_error_errno(u, error, fmt, strna(_t)); \
1490 })
1491
1492 static int fork_needed(const SocketAddress *address, const ExecContext *context) {
1493 int r;
1494
1495 assert(address);
1496 assert(context);
1497
1498 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1499
1500 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1501 r = bpf_firewall_supported();
1502 if (r < 0)
1503 return r;
1504 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1505 return true;
1506 }
1507
1508 return exec_needs_network_namespace(context);
1509 }
1510
1511 static int socket_address_listen_in_cgroup(
1512 Socket *s,
1513 const SocketAddress *address,
1514 const char *label) {
1515
1516 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1517 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1518 int fd, r;
1519
1520 assert(s);
1521 assert(address);
1522
1523 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1524 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1525 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1526 * such. */
1527
1528 r = fork_needed(address, &s->exec_context);
1529 if (r < 0)
1530 return r;
1531 if (r == 0) {
1532 /* Shortcut things... */
1533 fd = socket_address_listen_do(s, address, label);
1534 if (fd < 0)
1535 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1536
1537 return fd;
1538 }
1539
1540 r = unit_setup_exec_runtime(UNIT(s));
1541 if (r < 0)
1542 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1543
1544 if (s->exec_context.network_namespace_path &&
1545 s->exec_runtime &&
1546 s->exec_runtime->shared &&
1547 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1548 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1549 if (r < 0)
1550 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1551 }
1552
1553 if (s->exec_context.ipc_namespace_path &&
1554 s->exec_runtime &&
1555 s->exec_runtime->shared &&
1556 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1557 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1558 if (r < 0)
1559 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1560 }
1561
1562 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1563 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1564
1565 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1566 if (r < 0)
1567 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1568 if (r == 0) {
1569 /* Child */
1570
1571 pair[0] = safe_close(pair[0]);
1572
1573 if (exec_needs_network_namespace(&s->exec_context) &&
1574 s->exec_runtime &&
1575 s->exec_runtime->shared &&
1576 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1577
1578 if (ns_type_supported(NAMESPACE_NET)) {
1579 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1580 if (r < 0) {
1581 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1582 _exit(EXIT_NETWORK);
1583 }
1584 } else if (s->exec_context.network_namespace_path) {
1585 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1586 _exit(EXIT_NETWORK);
1587 } else
1588 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1589 }
1590
1591 fd = socket_address_listen_do(s, address, label);
1592 if (fd < 0) {
1593 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1594 _exit(EXIT_FAILURE);
1595 }
1596
1597 r = send_one_fd(pair[1], fd, 0);
1598 if (r < 0) {
1599 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1600 _exit(EXIT_FAILURE);
1601 }
1602
1603 _exit(EXIT_SUCCESS);
1604 }
1605
1606 pair[1] = safe_close(pair[1]);
1607 fd = receive_one_fd(pair[0], 0);
1608
1609 /* We synchronously wait for the helper, as it shouldn't be slow */
1610 r = wait_for_terminate_and_check("(sd-listen)", pid.pid, WAIT_LOG_ABNORMAL);
1611 if (r < 0) {
1612 safe_close(fd);
1613 return r;
1614 }
1615
1616 if (fd < 0)
1617 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1618
1619 return fd;
1620 }
1621
1622 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1623
1624 static int socket_open_fds(Socket *orig_s) {
1625 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1626 _cleanup_(mac_selinux_freep) char *label = NULL;
1627 bool know_label = false;
1628 int r;
1629
1630 assert(s);
1631
1632 LIST_FOREACH(port, p, s->ports) {
1633
1634 if (p->fd >= 0)
1635 continue;
1636
1637 switch (p->type) {
1638
1639 case SOCKET_SOCKET:
1640
1641 if (!know_label) {
1642 /* Figure out the label, if we don't it know yet. We do it once for the first
1643 * socket where we need this and remember it for the rest. */
1644
1645 r = socket_determine_selinux_label(s, &label);
1646 if (r < 0)
1647 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1648
1649 know_label = true;
1650 }
1651
1652 /* Apply the socket protocol */
1653 switch (p->address.type) {
1654
1655 case SOCK_STREAM:
1656 case SOCK_SEQPACKET:
1657 if (s->socket_protocol == IPPROTO_SCTP)
1658 p->address.protocol = s->socket_protocol;
1659 break;
1660
1661 case SOCK_DGRAM:
1662 if (s->socket_protocol == IPPROTO_UDPLITE)
1663 p->address.protocol = s->socket_protocol;
1664 break;
1665 }
1666
1667 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1668 if (p->fd < 0)
1669 return p->fd;
1670
1671 socket_apply_socket_options(s, p, p->fd);
1672 socket_symlink(s);
1673 break;
1674
1675 case SOCKET_SPECIAL:
1676
1677 p->fd = special_address_create(p->path, s->writable);
1678 if (p->fd < 0)
1679 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1680 break;
1681
1682 case SOCKET_FIFO:
1683
1684 p->fd = fifo_address_create(
1685 p->path,
1686 s->directory_mode,
1687 s->socket_mode);
1688 if (p->fd < 0)
1689 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1690
1691 socket_apply_fifo_options(s, p->fd);
1692 socket_symlink(s);
1693 break;
1694
1695 case SOCKET_MQUEUE:
1696
1697 p->fd = mq_address_create(
1698 p->path,
1699 s->socket_mode,
1700 s->mq_maxmsg,
1701 s->mq_msgsize);
1702 if (p->fd < 0)
1703 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1704 break;
1705
1706 case SOCKET_USB_FUNCTION: {
1707 _cleanup_free_ char *ep = NULL;
1708
1709 ep = path_make_absolute("ep0", p->path);
1710 if (!ep)
1711 return -ENOMEM;
1712
1713 p->fd = usbffs_address_create(ep);
1714 if (p->fd < 0)
1715 return p->fd;
1716
1717 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1718 if (r < 0)
1719 return r;
1720
1721 r = usbffs_dispatch_eps(p);
1722 if (r < 0)
1723 return r;
1724
1725 break;
1726 }
1727 default:
1728 assert_not_reached();
1729 }
1730 }
1731
1732 s = NULL;
1733 return 0;
1734 }
1735
1736 static void socket_unwatch_fds(Socket *s) {
1737 int r;
1738
1739 assert(s);
1740
1741 LIST_FOREACH(port, p, s->ports) {
1742 if (p->fd < 0)
1743 continue;
1744
1745 if (!p->event_source)
1746 continue;
1747
1748 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1749 if (r < 0)
1750 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1751 }
1752 }
1753
1754 static int socket_watch_fds(Socket *s) {
1755 int r;
1756
1757 assert(s);
1758
1759 LIST_FOREACH(port, p, s->ports) {
1760 if (p->fd < 0)
1761 continue;
1762
1763 if (p->event_source) {
1764 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1765 if (r < 0)
1766 goto fail;
1767 } else {
1768 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1769 if (r < 0)
1770 goto fail;
1771
1772 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1773 }
1774
1775 r = sd_event_source_set_ratelimit(p->event_source, s->poll_limit_interval, s->poll_limit_burst);
1776 if (r < 0)
1777 log_unit_debug_errno(UNIT(s), r, "Failed to set poll limit on I/O event source, ignoring: %m");
1778 }
1779
1780 return 0;
1781
1782 fail:
1783 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1784 socket_unwatch_fds(s);
1785 return r;
1786 }
1787
1788 enum {
1789 SOCKET_OPEN_NONE,
1790 SOCKET_OPEN_SOME,
1791 SOCKET_OPEN_ALL,
1792 };
1793
1794 static int socket_check_open(Socket *s) {
1795 bool have_open = false, have_closed = false;
1796
1797 assert(s);
1798
1799 LIST_FOREACH(port, p, s->ports) {
1800 if (p->fd < 0)
1801 have_closed = true;
1802 else
1803 have_open = true;
1804
1805 if (have_open && have_closed)
1806 return SOCKET_OPEN_SOME;
1807 }
1808
1809 if (have_open)
1810 return SOCKET_OPEN_ALL;
1811
1812 return SOCKET_OPEN_NONE;
1813 }
1814
1815 static void socket_set_state(Socket *s, SocketState state) {
1816 SocketState old_state;
1817 assert(s);
1818
1819 if (s->state != state)
1820 bus_unit_send_pending_change_signal(UNIT(s), false);
1821
1822 old_state = s->state;
1823 s->state = state;
1824
1825 if (!IN_SET(state,
1826 SOCKET_START_PRE,
1827 SOCKET_START_CHOWN,
1828 SOCKET_START_POST,
1829 SOCKET_STOP_PRE,
1830 SOCKET_STOP_PRE_SIGTERM,
1831 SOCKET_STOP_PRE_SIGKILL,
1832 SOCKET_STOP_POST,
1833 SOCKET_FINAL_SIGTERM,
1834 SOCKET_FINAL_SIGKILL,
1835 SOCKET_CLEANING)) {
1836
1837 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1838 socket_unwatch_control_pid(s);
1839 s->control_command = NULL;
1840 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1841 }
1842
1843 if (state != SOCKET_LISTENING)
1844 socket_unwatch_fds(s);
1845
1846 if (!IN_SET(state,
1847 SOCKET_START_CHOWN,
1848 SOCKET_START_POST,
1849 SOCKET_LISTENING,
1850 SOCKET_RUNNING,
1851 SOCKET_STOP_PRE,
1852 SOCKET_STOP_PRE_SIGTERM,
1853 SOCKET_STOP_PRE_SIGKILL,
1854 SOCKET_CLEANING))
1855 socket_close_fds(s);
1856
1857 if (state != old_state)
1858 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1859
1860 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1861 }
1862
1863 static int socket_coldplug(Unit *u) {
1864 Socket *s = SOCKET(u);
1865 int r;
1866
1867 assert(s);
1868 assert(s->state == SOCKET_DEAD);
1869
1870 if (s->deserialized_state == s->state)
1871 return 0;
1872
1873 if (pidref_is_set(&s->control_pid) &&
1874 pid_is_unwaited(s->control_pid.pid) &&
1875 IN_SET(s->deserialized_state,
1876 SOCKET_START_PRE,
1877 SOCKET_START_CHOWN,
1878 SOCKET_START_POST,
1879 SOCKET_STOP_PRE,
1880 SOCKET_STOP_PRE_SIGTERM,
1881 SOCKET_STOP_PRE_SIGKILL,
1882 SOCKET_STOP_POST,
1883 SOCKET_FINAL_SIGTERM,
1884 SOCKET_FINAL_SIGKILL,
1885 SOCKET_CLEANING)) {
1886
1887 r = unit_watch_pid(UNIT(s), s->control_pid.pid, /* exclusive= */ false);
1888 if (r < 0)
1889 return r;
1890
1891 r = socket_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1892 if (r < 0)
1893 return r;
1894 }
1895
1896 if (IN_SET(s->deserialized_state,
1897 SOCKET_START_CHOWN,
1898 SOCKET_START_POST,
1899 SOCKET_LISTENING,
1900 SOCKET_RUNNING)) {
1901
1902 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1903 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1904 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1905 * and if there's a mismatch, warn loudly. */
1906
1907 r = socket_check_open(s);
1908 if (r == SOCKET_OPEN_NONE)
1909 log_unit_warning(UNIT(s),
1910 "Socket unit configuration has changed while unit has been running, "
1911 "no open socket file descriptor left. "
1912 "The socket unit is not functional until restarted.");
1913 else if (r == SOCKET_OPEN_SOME)
1914 log_unit_warning(UNIT(s),
1915 "Socket unit configuration has changed while unit has been running, "
1916 "and some socket file descriptors have not been opened yet. "
1917 "The socket unit is not fully functional until restarted.");
1918 }
1919
1920 if (s->deserialized_state == SOCKET_LISTENING) {
1921 r = socket_watch_fds(s);
1922 if (r < 0)
1923 return r;
1924 }
1925
1926 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1927 (void) unit_setup_exec_runtime(u);
1928
1929 socket_set_state(s, s->deserialized_state);
1930 return 0;
1931 }
1932
1933 static int socket_spawn(Socket *s, ExecCommand *c, PidRef *ret_pid) {
1934
1935 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1936 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1937 .stdin_fd = -EBADF,
1938 .stdout_fd = -EBADF,
1939 .stderr_fd = -EBADF,
1940 .exec_fd = -EBADF,
1941 };
1942 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1943 pid_t pid;
1944 int r;
1945
1946 assert(s);
1947 assert(c);
1948 assert(ret_pid);
1949
1950 r = unit_prepare_exec(UNIT(s));
1951 if (r < 0)
1952 return r;
1953
1954 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1955 if (r < 0)
1956 return r;
1957
1958 r = unit_set_exec_params(UNIT(s), &exec_params);
1959 if (r < 0)
1960 return r;
1961
1962 r = exec_spawn(UNIT(s),
1963 c,
1964 &s->exec_context,
1965 &exec_params,
1966 s->exec_runtime,
1967 &s->cgroup_context,
1968 &pid);
1969 if (r < 0)
1970 return r;
1971
1972 r = pidref_set_pid(&pidref, pid);
1973 if (r < 0)
1974 return r;
1975
1976 r = unit_watch_pid(UNIT(s), pidref.pid, /* exclusive= */ true);
1977 if (r < 0)
1978 return r;
1979
1980 *ret_pid = TAKE_PIDREF(pidref);
1981 return 0;
1982 }
1983
1984 static int socket_chown(Socket *s, PidRef *ret_pid) {
1985 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1986 int r;
1987
1988 assert(s);
1989
1990 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
1991 if (r < 0)
1992 return r;
1993
1994 /* We have to resolve the user names out-of-process, hence
1995 * let's fork here. It's messy, but well, what can we do? */
1996
1997 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1998 if (r < 0)
1999 return r;
2000 if (r == 0) {
2001 uid_t uid = UID_INVALID;
2002 gid_t gid = GID_INVALID;
2003
2004 /* Child */
2005
2006 if (!isempty(s->user)) {
2007 const char *user = s->user;
2008
2009 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
2010 if (r < 0) {
2011 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
2012 _exit(EXIT_USER);
2013 }
2014 }
2015
2016 if (!isempty(s->group)) {
2017 const char *group = s->group;
2018
2019 r = get_group_creds(&group, &gid, 0);
2020 if (r < 0) {
2021 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2022 _exit(EXIT_GROUP);
2023 }
2024 }
2025
2026 LIST_FOREACH(port, p, s->ports) {
2027 const char *path = NULL;
2028
2029 if (p->type == SOCKET_SOCKET)
2030 path = socket_address_get_path(&p->address);
2031 else if (p->type == SOCKET_FIFO)
2032 path = p->path;
2033
2034 if (!path)
2035 continue;
2036
2037 if (chown(path, uid, gid) < 0) {
2038 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2039 _exit(EXIT_CHOWN);
2040 }
2041 }
2042
2043 _exit(EXIT_SUCCESS);
2044 }
2045
2046 r = unit_watch_pid(UNIT(s), pid.pid, /* exclusive= */ true);
2047 if (r < 0)
2048 return r;
2049
2050 *ret_pid = TAKE_PIDREF(pid);
2051 return 0;
2052 }
2053
2054 static void socket_enter_dead(Socket *s, SocketResult f) {
2055 assert(s);
2056
2057 if (s->result == SOCKET_SUCCESS)
2058 s->result = f;
2059
2060 if (s->result == SOCKET_SUCCESS)
2061 unit_log_success(UNIT(s));
2062 else
2063 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2064
2065 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2066
2067 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2068
2069 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2070
2071 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2072
2073 unit_unref_uid_gid(UNIT(s), true);
2074 }
2075
2076 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2077
2078 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2079 int r;
2080 assert(s);
2081
2082 if (s->result == SOCKET_SUCCESS)
2083 s->result = f;
2084
2085 socket_unwatch_control_pid(s);
2086 s->control_command_id = SOCKET_EXEC_STOP_POST;
2087 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2088
2089 if (s->control_command) {
2090 pidref_done(&s->control_pid);
2091
2092 r = socket_spawn(s, s->control_command, &s->control_pid);
2093 if (r < 0)
2094 goto fail;
2095
2096 socket_set_state(s, SOCKET_STOP_POST);
2097 } else
2098 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2099
2100 return;
2101
2102 fail:
2103 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
2104 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2105 }
2106
2107 static int state_to_kill_operation(Socket *s, SocketState state) {
2108 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2109 return KILL_RESTART;
2110
2111 if (state == SOCKET_FINAL_SIGTERM)
2112 return KILL_TERMINATE;
2113
2114 return KILL_KILL;
2115 }
2116
2117 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2118 int r;
2119
2120 assert(s);
2121
2122 if (s->result == SOCKET_SUCCESS)
2123 s->result = f;
2124
2125 r = unit_kill_context(
2126 UNIT(s),
2127 &s->kill_context,
2128 state_to_kill_operation(s, state),
2129 /* main_pid= */ NULL,
2130 &s->control_pid,
2131 /* main_pid_alien= */ false);
2132 if (r < 0)
2133 goto fail;
2134
2135 if (r > 0) {
2136 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
2137 if (r < 0)
2138 goto fail;
2139
2140 socket_set_state(s, state);
2141 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2142 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2143 else if (state == SOCKET_STOP_PRE_SIGKILL)
2144 socket_enter_stop_post(s, SOCKET_SUCCESS);
2145 else if (state == SOCKET_FINAL_SIGTERM)
2146 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2147 else
2148 socket_enter_dead(s, SOCKET_SUCCESS);
2149
2150 return;
2151
2152 fail:
2153 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2154
2155 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2156 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2157 else
2158 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2159 }
2160
2161 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2162 int r;
2163 assert(s);
2164
2165 if (s->result == SOCKET_SUCCESS)
2166 s->result = f;
2167
2168 socket_unwatch_control_pid(s);
2169 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2170 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2171
2172 if (s->control_command) {
2173 pidref_done(&s->control_pid);
2174
2175 r = socket_spawn(s, s->control_command, &s->control_pid);
2176 if (r < 0)
2177 goto fail;
2178
2179 socket_set_state(s, SOCKET_STOP_PRE);
2180 } else
2181 socket_enter_stop_post(s, SOCKET_SUCCESS);
2182
2183 return;
2184
2185 fail:
2186 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
2187 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2188 }
2189
2190 static void socket_enter_listening(Socket *s) {
2191 int r;
2192 assert(s);
2193
2194 if (!s->accept && s->flush_pending) {
2195 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2196 flush_ports(s);
2197 }
2198
2199 r = socket_watch_fds(s);
2200 if (r < 0) {
2201 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2202 goto fail;
2203 }
2204
2205 socket_set_state(s, SOCKET_LISTENING);
2206 return;
2207
2208 fail:
2209 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2210 }
2211
2212 static void socket_enter_start_post(Socket *s) {
2213 int r;
2214 assert(s);
2215
2216 socket_unwatch_control_pid(s);
2217 s->control_command_id = SOCKET_EXEC_START_POST;
2218 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2219
2220 if (s->control_command) {
2221 pidref_done(&s->control_pid);
2222
2223 r = socket_spawn(s, s->control_command, &s->control_pid);
2224 if (r < 0) {
2225 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
2226 goto fail;
2227 }
2228
2229 socket_set_state(s, SOCKET_START_POST);
2230 } else
2231 socket_enter_listening(s);
2232
2233 return;
2234
2235 fail:
2236 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2237 }
2238
2239 static void socket_enter_start_chown(Socket *s) {
2240 int r;
2241
2242 assert(s);
2243
2244 r = socket_open_fds(s);
2245 if (r < 0) {
2246 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2247 goto fail;
2248 }
2249
2250 if (!isempty(s->user) || !isempty(s->group)) {
2251
2252 socket_unwatch_control_pid(s);
2253 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2254 s->control_command = NULL;
2255
2256 r = socket_chown(s, &s->control_pid);
2257 if (r < 0) {
2258 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
2259 goto fail;
2260 }
2261
2262 socket_set_state(s, SOCKET_START_CHOWN);
2263 } else
2264 socket_enter_start_post(s);
2265
2266 return;
2267
2268 fail:
2269 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2270 }
2271
2272 static void socket_enter_start_pre(Socket *s) {
2273 int r;
2274 assert(s);
2275
2276 socket_unwatch_control_pid(s);
2277
2278 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2279
2280 s->control_command_id = SOCKET_EXEC_START_PRE;
2281 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2282
2283 if (s->control_command) {
2284 pidref_done(&s->control_pid);
2285
2286 r = socket_spawn(s, s->control_command, &s->control_pid);
2287 if (r < 0) {
2288 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2289 goto fail;
2290 }
2291
2292 socket_set_state(s, SOCKET_START_PRE);
2293 } else
2294 socket_enter_start_chown(s);
2295
2296 return;
2297
2298 fail:
2299 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2300 }
2301
2302 static void flush_ports(Socket *s) {
2303 assert(s);
2304
2305 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2306 * anymore */
2307
2308 LIST_FOREACH(port, p, s->ports) {
2309 if (p->fd < 0)
2310 continue;
2311
2312 (void) flush_accept(p->fd);
2313 (void) flush_fd(p->fd);
2314 }
2315 }
2316
2317 static void socket_enter_running(Socket *s, int cfd_in) {
2318 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2319 * somewhere or close it. */
2320 _cleanup_close_ int cfd = cfd_in;
2321
2322 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2323 int r;
2324
2325 assert(s);
2326
2327 /* We don't take connections anymore if we are supposed to shut down anyway */
2328 if (unit_stop_pending(UNIT(s))) {
2329
2330 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2331
2332 if (cfd >= 0)
2333 goto refuse;
2334
2335 flush_ports(s);
2336 return;
2337 }
2338
2339 if (!ratelimit_below(&s->trigger_limit)) {
2340 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2341 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2342 goto refuse;
2343 }
2344
2345 if (cfd < 0) {
2346 bool pending = false;
2347 Unit *other;
2348
2349 /* If there's already a start pending don't bother to do anything */
2350 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2351 if (unit_active_or_pending(other)) {
2352 pending = true;
2353 break;
2354 }
2355
2356 if (!pending) {
2357 if (!UNIT_ISSET(s->service)) {
2358 r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2359 "Service to activate vanished, refusing activation.");
2360 goto fail;
2361 }
2362
2363 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2364 if (r < 0)
2365 goto fail;
2366 }
2367
2368 socket_set_state(s, SOCKET_RUNNING);
2369 } else {
2370 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2371 Unit *service;
2372
2373 if (s->n_connections >= s->max_connections) {
2374 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2375 s->n_connections);
2376 goto refuse;
2377 }
2378
2379 if (s->max_connections_per_source > 0) {
2380 r = socket_acquire_peer(s, cfd, &p);
2381 if (r < 0) {
2382 if (ERRNO_IS_DISCONNECT(r))
2383 return;
2384 /* We didn't have enough resources to acquire peer information, let's fail. */
2385 goto fail;
2386 }
2387 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2388 _cleanup_free_ char *t = NULL;
2389
2390 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2391
2392 log_unit_warning(UNIT(s),
2393 "Too many incoming connections (%u) from source %s, dropping connection.",
2394 p->n_ref, strnull(t));
2395 goto refuse;
2396 }
2397 }
2398
2399 r = socket_load_service_unit(s, cfd, &service);
2400 if (r < 0) {
2401 if (ERRNO_IS_DISCONNECT(r))
2402 return;
2403 goto fail;
2404 }
2405
2406 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2407 false, UNIT_DEPENDENCY_IMPLICIT);
2408 if (r < 0)
2409 goto fail;
2410
2411 s->n_accepted++;
2412
2413 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2414 if (r < 0) {
2415 if (ERRNO_IS_DISCONNECT(r))
2416 return;
2417 goto fail;
2418 }
2419
2420 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2421 s->n_connections++;
2422
2423 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2424 if (r < 0) {
2425 /* We failed to activate the new service, but it still exists. Let's make sure the
2426 * service closes and forgets the connection fd again, immediately. */
2427 service_release_socket_fd(SERVICE(service));
2428 goto fail;
2429 }
2430
2431 /* Notify clients about changed counters */
2432 unit_add_to_dbus_queue(UNIT(s));
2433 }
2434
2435 TAKE_FD(cfd);
2436 return;
2437
2438 refuse:
2439 s->n_refused++;
2440 return;
2441
2442 fail:
2443 if (ERRNO_IS_RESOURCE(r))
2444 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2445 bus_error_message(&error, r));
2446 else
2447 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2448 cfd >= 0 ? "template" : "non-template",
2449 bus_error_message(&error, r));
2450
2451 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2452 }
2453
2454 static void socket_run_next(Socket *s) {
2455 int r;
2456
2457 assert(s);
2458 assert(s->control_command);
2459 assert(s->control_command->command_next);
2460
2461 socket_unwatch_control_pid(s);
2462
2463 s->control_command = s->control_command->command_next;
2464
2465 pidref_done(&s->control_pid);
2466
2467 r = socket_spawn(s, s->control_command, &s->control_pid);
2468 if (r < 0)
2469 goto fail;
2470
2471 return;
2472
2473 fail:
2474 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
2475
2476 if (s->state == SOCKET_START_POST)
2477 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2478 else if (s->state == SOCKET_STOP_POST)
2479 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2480 else
2481 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2482 }
2483
2484 static int socket_start(Unit *u) {
2485 Socket *s = SOCKET(u);
2486 int r;
2487
2488 assert(s);
2489
2490 /* We cannot fulfill this request right now, try again later
2491 * please! */
2492 if (IN_SET(s->state,
2493 SOCKET_STOP_PRE,
2494 SOCKET_STOP_PRE_SIGKILL,
2495 SOCKET_STOP_PRE_SIGTERM,
2496 SOCKET_STOP_POST,
2497 SOCKET_FINAL_SIGTERM,
2498 SOCKET_FINAL_SIGKILL,
2499 SOCKET_CLEANING))
2500 return -EAGAIN;
2501
2502 /* Already on it! */
2503 if (IN_SET(s->state,
2504 SOCKET_START_PRE,
2505 SOCKET_START_CHOWN,
2506 SOCKET_START_POST))
2507 return 0;
2508
2509 /* Cannot run this without the service being around */
2510 if (UNIT_ISSET(s->service)) {
2511 Service *service;
2512
2513 service = SERVICE(UNIT_DEREF(s->service));
2514
2515 if (UNIT(service)->load_state != UNIT_LOADED)
2516 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT),
2517 "Socket service %s not loaded, refusing.", UNIT(service)->id);
2518
2519 /* If the service is already active we cannot start the
2520 * socket */
2521 if (!IN_SET(service->state,
2522 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
2523 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
2524 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY),
2525 "Socket service %s already active, refusing.", UNIT(service)->id);
2526 }
2527
2528 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2529
2530 r = unit_acquire_invocation_id(u);
2531 if (r < 0)
2532 return r;
2533
2534 s->result = SOCKET_SUCCESS;
2535 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2536
2537 u->reset_accounting = true;
2538
2539 socket_enter_start_pre(s);
2540 return 1;
2541 }
2542
2543 static int socket_stop(Unit *u) {
2544 Socket *s = SOCKET(u);
2545
2546 assert(s);
2547
2548 /* Already on it */
2549 if (IN_SET(s->state,
2550 SOCKET_STOP_PRE,
2551 SOCKET_STOP_PRE_SIGTERM,
2552 SOCKET_STOP_PRE_SIGKILL,
2553 SOCKET_STOP_POST,
2554 SOCKET_FINAL_SIGTERM,
2555 SOCKET_FINAL_SIGKILL))
2556 return 0;
2557
2558 /* If there's already something running we go directly into
2559 * kill mode. */
2560 if (IN_SET(s->state,
2561 SOCKET_START_PRE,
2562 SOCKET_START_CHOWN,
2563 SOCKET_START_POST)) {
2564 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2565 return -EAGAIN;
2566 }
2567
2568 /* If we are currently cleaning, then abort it, brutally. */
2569 if (s->state == SOCKET_CLEANING) {
2570 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2571 return 0;
2572 }
2573
2574 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2575
2576 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2577 return 1;
2578 }
2579
2580 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2581 Socket *s = SOCKET(u);
2582 int r;
2583
2584 assert(u);
2585 assert(f);
2586 assert(fds);
2587
2588 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2589 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2590 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2591 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2592
2593 if (pidref_is_set(&s->control_pid))
2594 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid.pid);
2595
2596 if (s->control_command_id >= 0)
2597 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2598
2599 LIST_FOREACH(port, p, s->ports) {
2600 int copy;
2601
2602 if (p->fd < 0)
2603 continue;
2604
2605 copy = fdset_put_dup(fds, p->fd);
2606 if (copy < 0)
2607 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2608
2609 if (p->type == SOCKET_SOCKET) {
2610 _cleanup_free_ char *t = NULL;
2611
2612 r = socket_address_print(&p->address, &t);
2613 if (r < 0)
2614 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2615
2616 if (socket_address_family(&p->address) == AF_NETLINK)
2617 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2618 else
2619 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2620 } else if (p->type == SOCKET_SPECIAL)
2621 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2622 else if (p->type == SOCKET_MQUEUE)
2623 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2624 else if (p->type == SOCKET_USB_FUNCTION)
2625 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2626 else {
2627 assert(p->type == SOCKET_FIFO);
2628 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2629 }
2630 }
2631
2632 return 0;
2633 }
2634
2635 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2636 Socket *s = SOCKET(u);
2637 int r;
2638
2639 assert(u);
2640 assert(key);
2641 assert(value);
2642
2643 if (streq(key, "state")) {
2644 SocketState state;
2645
2646 state = socket_state_from_string(value);
2647 if (state < 0)
2648 log_unit_debug(u, "Failed to parse state value: %s", value);
2649 else
2650 s->deserialized_state = state;
2651 } else if (streq(key, "result")) {
2652 SocketResult f;
2653
2654 f = socket_result_from_string(value);
2655 if (f < 0)
2656 log_unit_debug(u, "Failed to parse result value: %s", value);
2657 else if (f != SOCKET_SUCCESS)
2658 s->result = f;
2659
2660 } else if (streq(key, "n-accepted")) {
2661 unsigned k;
2662
2663 if (safe_atou(value, &k) < 0)
2664 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2665 else
2666 s->n_accepted += k;
2667 } else if (streq(key, "n-refused")) {
2668 unsigned k;
2669
2670 if (safe_atou(value, &k) < 0)
2671 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2672 else
2673 s->n_refused += k;
2674 } else if (streq(key, "control-pid")) {
2675 pidref_done(&s->control_pid);
2676 r = pidref_set_pidstr(&s->control_pid, value);
2677 if (r < 0)
2678 log_debug_errno(r, "Failed to pin control PID '%s', ignoring: %m", value);
2679 } else if (streq(key, "control-command")) {
2680 SocketExecCommand id;
2681
2682 id = socket_exec_command_from_string(value);
2683 if (id < 0)
2684 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2685 else {
2686 s->control_command_id = id;
2687 s->control_command = s->exec_command[id];
2688 }
2689 } else if (streq(key, "fifo")) {
2690 _cleanup_free_ char *fdv = NULL;
2691 bool found = false;
2692 int fd;
2693
2694 r = extract_first_word(&value, &fdv, NULL, 0);
2695 if (r <= 0) {
2696 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2697 return 0;
2698 }
2699
2700 fd = parse_fd(fdv);
2701 if (fd < 0 || !fdset_contains(fds, fd)) {
2702 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2703 return 0;
2704 }
2705
2706 LIST_FOREACH(port, p, s->ports)
2707 if (p->fd < 0 &&
2708 p->type == SOCKET_FIFO &&
2709 path_equal_or_inode_same(p->path, value, 0)) {
2710 p->fd = fdset_remove(fds, fd);
2711 found = true;
2712 break;
2713 }
2714 if (!found)
2715 log_unit_debug(u, "No matching fifo socket found: %s", value);
2716
2717 } else if (streq(key, "special")) {
2718 _cleanup_free_ char *fdv = NULL;
2719 bool found = false;
2720 int fd;
2721
2722 r = extract_first_word(&value, &fdv, NULL, 0);
2723 if (r <= 0) {
2724 log_unit_debug(u, "Failed to parse special value: %s", value);
2725 return 0;
2726 }
2727
2728 fd = parse_fd(fdv);
2729 if (fd < 0 || !fdset_contains(fds, fd)) {
2730 log_unit_debug(u, "Invalid special value: %s", fdv);
2731 return 0;
2732 }
2733
2734 LIST_FOREACH(port, p, s->ports)
2735 if (p->fd < 0 &&
2736 p->type == SOCKET_SPECIAL &&
2737 path_equal_or_inode_same(p->path, value, 0)) {
2738 p->fd = fdset_remove(fds, fd);
2739 found = true;
2740 break;
2741 }
2742 if (!found)
2743 log_unit_debug(u, "No matching special socket found: %s", value);
2744
2745 } else if (streq(key, "mqueue")) {
2746 _cleanup_free_ char *fdv = NULL;
2747 bool found = false;
2748 int fd;
2749
2750 r = extract_first_word(&value, &fdv, NULL, 0);
2751 if (r <= 0) {
2752 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2753 return 0;
2754 }
2755
2756 fd = parse_fd(fdv);
2757 if (fd < 0 || !fdset_contains(fds, fd)) {
2758 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2759 return 0;
2760 }
2761
2762 LIST_FOREACH(port, p, s->ports)
2763 if (p->fd < 0 &&
2764 p->type == SOCKET_MQUEUE &&
2765 streq(p->path, value)) {
2766 p->fd = fdset_remove(fds, fd);
2767 found = true;
2768 break;
2769 }
2770 if (!found)
2771 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2772
2773 } else if (streq(key, "socket")) {
2774 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2775 bool found = false;
2776 int fd, type;
2777
2778 r = extract_first_word(&value, &fdv, NULL, 0);
2779 if (r <= 0) {
2780 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2781 return 0;
2782 }
2783
2784 fd = parse_fd(fdv);
2785 if (fd < 0 || !fdset_contains(fds, fd)) {
2786 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2787 return 0;
2788 }
2789
2790 r = extract_first_word(&value, &typev, NULL, 0);
2791 if (r <= 0) {
2792 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2793 return 0;
2794 }
2795
2796 if (safe_atoi(typev, &type) < 0 || type < 0) {
2797 log_unit_debug(u, "Invalid socket type: %s", typev);
2798 return 0;
2799 }
2800
2801 LIST_FOREACH(port, p, s->ports)
2802 if (p->fd < 0 &&
2803 socket_address_is(&p->address, value, type)) {
2804 p->fd = fdset_remove(fds, fd);
2805 found = true;
2806 break;
2807 }
2808 if (!found)
2809 log_unit_debug(u, "No matching %s socket found: %s",
2810 socket_address_type_to_string(type), value);
2811
2812 } else if (streq(key, "netlink")) {
2813 _cleanup_free_ char *fdv = NULL;
2814 bool found = false;
2815 int fd;
2816
2817 r = extract_first_word(&value, &fdv, NULL, 0);
2818 if (r <= 0) {
2819 log_unit_debug(u, "Failed to parse socket value: %s", value);
2820 return 0;
2821 }
2822
2823 fd = parse_fd(fdv);
2824 if (fd < 0 || !fdset_contains(fds, fd)) {
2825 log_unit_debug(u, "Invalid socket value: %s", fdv);
2826 return 0;
2827 }
2828
2829 LIST_FOREACH(port, p, s->ports)
2830 if (p->fd < 0 &&
2831 socket_address_is_netlink(&p->address, value)) {
2832 p->fd = fdset_remove(fds, fd);
2833 found = true;
2834 break;
2835 }
2836 if (!found)
2837 log_unit_debug(u, "No matching netlink socket found: %s", value);
2838
2839 } else if (streq(key, "ffs")) {
2840 _cleanup_free_ char *fdv = NULL;
2841 bool found = false;
2842 int fd;
2843
2844 r = extract_first_word(&value, &fdv, NULL, 0);
2845 if (r <= 0) {
2846 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2847 return 0;
2848 }
2849
2850 fd = parse_fd(fdv);
2851 if (fd < 0 || !fdset_contains(fds, fd)) {
2852 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2853 return 0;
2854 }
2855
2856 LIST_FOREACH(port, p, s->ports)
2857 if (p->fd < 0 &&
2858 p->type == SOCKET_USB_FUNCTION &&
2859 path_equal_or_inode_same(p->path, value, 0)) {
2860 p->fd = fdset_remove(fds, fd);
2861 found = true;
2862 break;
2863 }
2864 if (!found)
2865 log_unit_debug(u, "No matching ffs socket found: %s", value);
2866
2867 } else
2868 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2869
2870 return 0;
2871 }
2872
2873 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2874 Socket *s = SOCKET(u);
2875
2876 assert(u);
2877
2878 LIST_FOREACH(port, p, s->ports) {
2879 int fd;
2880
2881 if (p->type != SOCKET_SOCKET)
2882 continue;
2883
2884 if (p->fd >= 0)
2885 continue;
2886
2887 FDSET_FOREACH(fd, fds) {
2888 if (socket_address_matches_fd(&p->address, fd)) {
2889 p->fd = fdset_remove(fds, fd);
2890 s->deserialized_state = SOCKET_LISTENING;
2891 break;
2892 }
2893 }
2894 }
2895 }
2896
2897 static UnitActiveState socket_active_state(Unit *u) {
2898 assert(u);
2899
2900 return state_translation_table[SOCKET(u)->state];
2901 }
2902
2903 static const char *socket_sub_state_to_string(Unit *u) {
2904 assert(u);
2905
2906 return socket_state_to_string(SOCKET(u)->state);
2907 }
2908
2909 const char* socket_port_type_to_string(SocketPort *p) {
2910
2911 assert(p);
2912
2913 switch (p->type) {
2914
2915 case SOCKET_SOCKET:
2916
2917 switch (p->address.type) {
2918
2919 case SOCK_STREAM:
2920 return "Stream";
2921
2922 case SOCK_DGRAM:
2923 return "Datagram";
2924
2925 case SOCK_SEQPACKET:
2926 return "SequentialPacket";
2927
2928 case SOCK_RAW:
2929 if (socket_address_family(&p->address) == AF_NETLINK)
2930 return "Netlink";
2931
2932 _fallthrough_;
2933 default:
2934 return NULL;
2935 }
2936
2937 case SOCKET_SPECIAL:
2938 return "Special";
2939
2940 case SOCKET_MQUEUE:
2941 return "MessageQueue";
2942
2943 case SOCKET_FIFO:
2944 return "FIFO";
2945
2946 case SOCKET_USB_FUNCTION:
2947 return "USBFunction";
2948
2949 default:
2950 return NULL;
2951 }
2952 }
2953
2954 SocketType socket_port_type_from_string(const char *s) {
2955 assert(s);
2956
2957 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2958 return SOCKET_SOCKET;
2959 else if (streq(s, "Special"))
2960 return SOCKET_SPECIAL;
2961 else if (streq(s, "MessageQueue"))
2962 return SOCKET_MQUEUE;
2963 else if (streq(s, "FIFO"))
2964 return SOCKET_FIFO;
2965 else if (streq(s, "USBFunction"))
2966 return SOCKET_USB_FUNCTION;
2967 else
2968 return _SOCKET_TYPE_INVALID;
2969 }
2970
2971 static bool socket_may_gc(Unit *u) {
2972 Socket *s = SOCKET(u);
2973
2974 assert(u);
2975
2976 return s->n_connections == 0;
2977 }
2978
2979 static int socket_accept_do(Socket *s, int fd) {
2980 int cfd;
2981
2982 assert(s);
2983 assert(fd >= 0);
2984
2985 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2986 if (cfd < 0)
2987 /* Convert transient network errors into clean and well-defined EAGAIN */
2988 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2989
2990 return cfd;
2991 }
2992
2993 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2994 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
2995 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2996 int cfd, r;
2997
2998 assert(s);
2999 assert(p);
3000 assert(fd >= 0);
3001
3002 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
3003 * connection socket is also properly associated with the cgroup. */
3004
3005 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
3006 goto shortcut;
3007
3008 r = bpf_firewall_supported();
3009 if (r < 0)
3010 return r;
3011 if (r == BPF_FIREWALL_UNSUPPORTED)
3012 goto shortcut;
3013
3014 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
3015 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
3016
3017 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
3018 if (r < 0)
3019 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
3020 if (r == 0) {
3021 /* Child */
3022
3023 pair[0] = safe_close(pair[0]);
3024
3025 cfd = socket_accept_do(s, fd);
3026 if (cfd == -EAGAIN) /* spurious accept() */
3027 _exit(EXIT_SUCCESS);
3028 if (cfd < 0) {
3029 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3030 _exit(EXIT_FAILURE);
3031 }
3032
3033 r = send_one_fd(pair[1], cfd, 0);
3034 if (r < 0) {
3035 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3036 _exit(EXIT_FAILURE);
3037 }
3038
3039 _exit(EXIT_SUCCESS);
3040 }
3041
3042 pair[1] = safe_close(pair[1]);
3043 cfd = receive_one_fd(pair[0], 0);
3044
3045 /* We synchronously wait for the helper, as it shouldn't be slow */
3046 r = wait_for_terminate_and_check("(sd-accept)", pid.pid, WAIT_LOG_ABNORMAL);
3047 if (r < 0) {
3048 safe_close(cfd);
3049 return r;
3050 }
3051
3052 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3053 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3054 if (cfd == -EIO)
3055 return -EAGAIN;
3056 if (cfd < 0)
3057 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3058
3059 return cfd;
3060
3061 shortcut:
3062 cfd = socket_accept_do(s, fd);
3063 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3064 return -EAGAIN;
3065 if (cfd < 0)
3066 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3067
3068 return cfd;
3069 }
3070
3071 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3072 SocketPort *p = ASSERT_PTR(userdata);
3073 int cfd = -EBADF;
3074
3075 assert(fd >= 0);
3076
3077 if (p->socket->state != SOCKET_LISTENING)
3078 return 0;
3079
3080 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3081
3082 if (revents != EPOLLIN) {
3083 if (revents & EPOLLHUP)
3084 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.");
3085 else
3086 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3087 goto fail;
3088 }
3089
3090 if (p->socket->accept &&
3091 p->type == SOCKET_SOCKET &&
3092 socket_address_can_accept(&p->address)) {
3093
3094 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3095 if (cfd == -EAGAIN) /* Spurious accept() */
3096 return 0;
3097 if (cfd < 0)
3098 goto fail;
3099
3100 socket_apply_socket_options(p->socket, p, cfd);
3101 }
3102
3103 socket_enter_running(p->socket, cfd);
3104 return 0;
3105
3106 fail:
3107 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3108 return 0;
3109 }
3110
3111 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3112 Socket *s = SOCKET(u);
3113 SocketResult f;
3114
3115 assert(s);
3116 assert(pid >= 0);
3117
3118 if (pid != s->control_pid.pid)
3119 return;
3120
3121 pidref_done(&s->control_pid);
3122
3123 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3124 f = SOCKET_SUCCESS;
3125 else if (code == CLD_EXITED)
3126 f = SOCKET_FAILURE_EXIT_CODE;
3127 else if (code == CLD_KILLED)
3128 f = SOCKET_FAILURE_SIGNAL;
3129 else if (code == CLD_DUMPED)
3130 f = SOCKET_FAILURE_CORE_DUMP;
3131 else
3132 assert_not_reached();
3133
3134 if (s->control_command) {
3135 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3136
3137 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3138 f = SOCKET_SUCCESS;
3139 }
3140
3141 unit_log_process_exit(
3142 u,
3143 "Control process",
3144 socket_exec_command_to_string(s->control_command_id),
3145 f == SOCKET_SUCCESS,
3146 code, status);
3147
3148 if (s->result == SOCKET_SUCCESS)
3149 s->result = f;
3150
3151 if (s->control_command &&
3152 s->control_command->command_next &&
3153 f == SOCKET_SUCCESS) {
3154
3155 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3156 socket_run_next(s);
3157 } else {
3158 s->control_command = NULL;
3159 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3160
3161 /* No further commands for this step, so let's figure
3162 * out what to do next */
3163
3164 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3165
3166 switch (s->state) {
3167
3168 case SOCKET_START_PRE:
3169 if (f == SOCKET_SUCCESS)
3170 socket_enter_start_chown(s);
3171 else
3172 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3173 break;
3174
3175 case SOCKET_START_CHOWN:
3176 if (f == SOCKET_SUCCESS)
3177 socket_enter_start_post(s);
3178 else
3179 socket_enter_stop_pre(s, f);
3180 break;
3181
3182 case SOCKET_START_POST:
3183 if (f == SOCKET_SUCCESS)
3184 socket_enter_listening(s);
3185 else
3186 socket_enter_stop_pre(s, f);
3187 break;
3188
3189 case SOCKET_STOP_PRE:
3190 case SOCKET_STOP_PRE_SIGTERM:
3191 case SOCKET_STOP_PRE_SIGKILL:
3192 socket_enter_stop_post(s, f);
3193 break;
3194
3195 case SOCKET_STOP_POST:
3196 case SOCKET_FINAL_SIGTERM:
3197 case SOCKET_FINAL_SIGKILL:
3198 socket_enter_dead(s, f);
3199 break;
3200
3201 case SOCKET_CLEANING:
3202
3203 if (s->clean_result == SOCKET_SUCCESS)
3204 s->clean_result = f;
3205
3206 socket_enter_dead(s, SOCKET_SUCCESS);
3207 break;
3208
3209 default:
3210 assert_not_reached();
3211 }
3212 }
3213
3214 /* Notify clients about changed exit status */
3215 unit_add_to_dbus_queue(u);
3216 }
3217
3218 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3219 Socket *s = SOCKET(userdata);
3220
3221 assert(s);
3222 assert(s->timer_event_source == source);
3223
3224 switch (s->state) {
3225
3226 case SOCKET_START_PRE:
3227 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3228 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3229 break;
3230
3231 case SOCKET_START_CHOWN:
3232 case SOCKET_START_POST:
3233 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3234 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3235 break;
3236
3237 case SOCKET_STOP_PRE:
3238 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3239 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3240 break;
3241
3242 case SOCKET_STOP_PRE_SIGTERM:
3243 if (s->kill_context.send_sigkill) {
3244 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3245 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3246 } else {
3247 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3248 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3249 }
3250 break;
3251
3252 case SOCKET_STOP_PRE_SIGKILL:
3253 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3254 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3255 break;
3256
3257 case SOCKET_STOP_POST:
3258 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3259 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3260 break;
3261
3262 case SOCKET_FINAL_SIGTERM:
3263 if (s->kill_context.send_sigkill) {
3264 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3265 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3266 } else {
3267 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3268 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3269 }
3270 break;
3271
3272 case SOCKET_FINAL_SIGKILL:
3273 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3274 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3275 break;
3276
3277 case SOCKET_CLEANING:
3278 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3279
3280 if (s->clean_result == SOCKET_SUCCESS)
3281 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3282
3283 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3284 break;
3285
3286 default:
3287 assert_not_reached();
3288 }
3289
3290 return 0;
3291 }
3292
3293 int socket_collect_fds(Socket *s, int **fds) {
3294 size_t k = 0, n = 0;
3295 int *rfds;
3296
3297 assert(s);
3298 assert(fds);
3299
3300 /* Called from the service code for requesting our fds */
3301
3302 LIST_FOREACH(port, p, s->ports) {
3303 if (p->fd >= 0)
3304 n++;
3305 n += p->n_auxiliary_fds;
3306 }
3307
3308 if (n <= 0) {
3309 *fds = NULL;
3310 return 0;
3311 }
3312
3313 rfds = new(int, n);
3314 if (!rfds)
3315 return -ENOMEM;
3316
3317 LIST_FOREACH(port, p, s->ports) {
3318 if (p->fd >= 0)
3319 rfds[k++] = p->fd;
3320 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3321 rfds[k++] = p->auxiliary_fds[i];
3322 }
3323
3324 assert(k == n);
3325
3326 *fds = rfds;
3327 return (int) n;
3328 }
3329
3330 static void socket_reset_failed(Unit *u) {
3331 Socket *s = SOCKET(u);
3332
3333 assert(s);
3334
3335 if (s->state == SOCKET_FAILED)
3336 socket_set_state(s, SOCKET_DEAD);
3337
3338 s->result = SOCKET_SUCCESS;
3339 s->clean_result = SOCKET_SUCCESS;
3340 }
3341
3342 void socket_connection_unref(Socket *s) {
3343 assert(s);
3344
3345 /* The service is dead. Yay!
3346 *
3347 * This is strictly for one-instance-per-connection
3348 * services. */
3349
3350 assert(s->n_connections > 0);
3351 s->n_connections--;
3352
3353 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3354 }
3355
3356 static void socket_trigger_notify(Unit *u, Unit *other) {
3357 Socket *s = SOCKET(u);
3358
3359 assert(u);
3360 assert(other);
3361
3362 /* Filter out invocations with bogus state */
3363 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3364 assert(other->type == UNIT_SERVICE);
3365
3366 /* Don't propagate state changes from the service if we are already down */
3367 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3368 return;
3369
3370 /* We don't care for the service state if we are in Accept=yes mode */
3371 if (s->accept)
3372 return;
3373
3374 /* Propagate start limit hit state */
3375 if (other->start_limit_hit) {
3376 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3377 return;
3378 }
3379
3380 /* Don't propagate anything if there's still a job queued */
3381 if (other->job)
3382 return;
3383
3384 if (IN_SET(SERVICE(other)->state,
3385 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3386 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3387 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
3388 socket_enter_listening(s);
3389
3390 if (SERVICE(other)->state == SERVICE_RUNNING)
3391 socket_set_state(s, SOCKET_RUNNING);
3392 }
3393
3394 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3395 Socket *s = SOCKET(u);
3396 usec_t t;
3397 int r;
3398
3399 if (!s->timer_event_source)
3400 return 0;
3401
3402 r = sd_event_source_get_time(s->timer_event_source, &t);
3403 if (r < 0)
3404 return r;
3405 if (t == USEC_INFINITY)
3406 return 0;
3407
3408 *timeout = t;
3409 return 1;
3410 }
3411
3412 char *socket_fdname(Socket *s) {
3413 assert(s);
3414
3415 /* Returns the name to use for $LISTEN_NAMES. If the user
3416 * didn't specify anything specifically, use the socket unit's
3417 * name as fallback. */
3418
3419 return s->fdname ?: UNIT(s)->id;
3420 }
3421
3422 static PidRef *socket_control_pid(Unit *u) {
3423 return &ASSERT_PTR(SOCKET(u))->control_pid;
3424 }
3425
3426 static int socket_clean(Unit *u, ExecCleanMask mask) {
3427 _cleanup_strv_free_ char **l = NULL;
3428 Socket *s = SOCKET(u);
3429 int r;
3430
3431 assert(s);
3432 assert(mask != 0);
3433
3434 if (s->state != SOCKET_DEAD)
3435 return -EBUSY;
3436
3437 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3438 if (r < 0)
3439 return r;
3440
3441 if (strv_isempty(l))
3442 return -EUNATCH;
3443
3444 socket_unwatch_control_pid(s);
3445 s->clean_result = SOCKET_SUCCESS;
3446 s->control_command = NULL;
3447 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3448
3449 r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec));
3450 if (r < 0)
3451 goto fail;
3452
3453 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3454 if (r < 0)
3455 goto fail;
3456
3457 socket_set_state(s, SOCKET_CLEANING);
3458 return 0;
3459
3460 fail:
3461 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
3462 s->clean_result = SOCKET_FAILURE_RESOURCES;
3463 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3464 return r;
3465 }
3466
3467 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3468 Socket *s = SOCKET(u);
3469
3470 assert(s);
3471
3472 return exec_context_get_clean_mask(&s->exec_context, ret);
3473 }
3474
3475 static int socket_can_start(Unit *u) {
3476 Socket *s = SOCKET(u);
3477 int r;
3478
3479 assert(s);
3480
3481 r = unit_test_start_limit(u);
3482 if (r < 0) {
3483 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3484 return r;
3485 }
3486
3487 return 1;
3488 }
3489
3490 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3491 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3492 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3493 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3494 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3495 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3496 };
3497
3498 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3499
3500 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3501 [SOCKET_SUCCESS] = "success",
3502 [SOCKET_FAILURE_RESOURCES] = "resources",
3503 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3504 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3505 [SOCKET_FAILURE_SIGNAL] = "signal",
3506 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3507 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3508 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3509 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3510 };
3511
3512 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3513
3514 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3515 [SOCKET_TIMESTAMPING_OFF] = "off",
3516 [SOCKET_TIMESTAMPING_US] = "us",
3517 [SOCKET_TIMESTAMPING_NS] = "ns",
3518 };
3519
3520 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3521
3522 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3523 SocketTimestamping t;
3524 int r;
3525
3526 if (!p)
3527 return _SOCKET_TIMESTAMPING_INVALID;
3528
3529 t = socket_timestamping_from_string(p);
3530 if (t >= 0)
3531 return t;
3532
3533 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3534 * too. */
3535 if (streq(p, "nsec"))
3536 return SOCKET_TIMESTAMPING_NS;
3537 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3538 return SOCKET_TIMESTAMPING_US;
3539
3540 r = parse_boolean(p);
3541 if (r < 0)
3542 return _SOCKET_TIMESTAMPING_INVALID;
3543
3544 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3545 }
3546
3547 const UnitVTable socket_vtable = {
3548 .object_size = sizeof(Socket),
3549 .exec_context_offset = offsetof(Socket, exec_context),
3550 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3551 .kill_context_offset = offsetof(Socket, kill_context),
3552 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3553
3554 .sections =
3555 "Unit\0"
3556 "Socket\0"
3557 "Install\0",
3558 .private_section = "Socket",
3559
3560 .can_transient = true,
3561 .can_trigger = true,
3562 .can_fail = true,
3563
3564 .init = socket_init,
3565 .done = socket_done,
3566 .load = socket_load,
3567
3568 .coldplug = socket_coldplug,
3569
3570 .dump = socket_dump,
3571
3572 .start = socket_start,
3573 .stop = socket_stop,
3574
3575 .clean = socket_clean,
3576 .can_clean = socket_can_clean,
3577
3578 .get_timeout = socket_get_timeout,
3579
3580 .serialize = socket_serialize,
3581 .deserialize_item = socket_deserialize_item,
3582 .distribute_fds = socket_distribute_fds,
3583
3584 .active_state = socket_active_state,
3585 .sub_state_to_string = socket_sub_state_to_string,
3586
3587 .will_restart = unit_will_restart_default,
3588
3589 .may_gc = socket_may_gc,
3590
3591 .sigchld_event = socket_sigchld_event,
3592
3593 .trigger_notify = socket_trigger_notify,
3594
3595 .reset_failed = socket_reset_failed,
3596
3597 .control_pid = socket_control_pid,
3598
3599 .bus_set_property = bus_socket_set_property,
3600 .bus_commit_properties = bus_socket_commit_properties,
3601
3602 .status_message_formats = {
3603 .finished_start_job = {
3604 [JOB_DONE] = "Listening on %s.",
3605 [JOB_FAILED] = "Failed to listen on %s.",
3606 [JOB_TIMEOUT] = "Timed out starting %s.",
3607 },
3608 .finished_stop_job = {
3609 [JOB_DONE] = "Closed %s.",
3610 [JOB_FAILED] = "Failed stopping %s.",
3611 [JOB_TIMEOUT] = "Timed out stopping %s.",
3612 },
3613 },
3614
3615 .can_start = socket_can_start,
3616 };
Unnamed repository; edit this file 'description' to name the repository.