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