]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/socket.c
projects / thirdparty / systemd.git / blob
? search:


91951460656516fae2b919566f4d699fa8f830b5
[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, bool relative, usec_t usec) {
186 assert(s);
187
188 return unit_arm_timer(UNIT(s), &s->timer_event_source, relative, usec, socket_dispatch_timer);
189 }
190
191 static bool have_non_accept_socket(Socket *s) {
192 assert(s);
193
194 if (!s->accept)
195 return true;
196
197 LIST_FOREACH(port, p, s->ports) {
198
199 if (p->type != SOCKET_SOCKET)
200 return true;
201
202 if (!socket_address_can_accept(&p->address))
203 return true;
204 }
205
206 return false;
207 }
208
209 static int socket_add_mount_dependencies(Socket *s) {
210 int r;
211
212 assert(s);
213
214 LIST_FOREACH(port, p, s->ports) {
215 const char *path = NULL;
216
217 if (p->type == SOCKET_SOCKET)
218 path = socket_address_get_path(&p->address);
219 else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION))
220 path = p->path;
221
222 if (!path)
223 continue;
224
225 r = unit_require_mounts_for(UNIT(s), path, UNIT_DEPENDENCY_FILE);
226 if (r < 0)
227 return r;
228 }
229
230 return 0;
231 }
232
233 static int socket_add_device_dependencies(Socket *s) {
234 char *t;
235
236 assert(s);
237
238 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
239 return 0;
240
241 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
242 return unit_add_node_dependency(UNIT(s), t, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
243 }
244
245 static int socket_add_default_dependencies(Socket *s) {
246 int r;
247 assert(s);
248
249 if (!UNIT(s)->default_dependencies)
250 return 0;
251
252 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
253 if (r < 0)
254 return r;
255
256 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
257 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
258 if (r < 0)
259 return r;
260 }
261
262 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
263 }
264
265 static bool socket_has_exec(Socket *s) {
266 unsigned i;
267 assert(s);
268
269 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
270 if (s->exec_command[i])
271 return true;
272
273 return false;
274 }
275
276 static int socket_add_extras(Socket *s) {
277 Unit *u = UNIT(s);
278 int r;
279
280 assert(s);
281
282 /* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
283 * in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
284 * ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
285 * and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
286 * off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
287 * process whatever is queued in one go, and thus should normally never have to be started frequently. This is
288 * different for Accept=yes where each connection is processed by a new service instance, and thus frequent
289 * service starts are typical.
290 *
291 * For the poll limit we follow a similar rule, but use 3/4th of the trigger limit parameters, to
292 * trigger this earlier. */
293
294 if (s->trigger_limit.interval == USEC_INFINITY)
295 s->trigger_limit.interval = 2 * USEC_PER_SEC;
296 if (s->trigger_limit.burst == UINT_MAX)
297 s->trigger_limit.burst = s->accept ? 200 : 20;
298
299 if (s->poll_limit_interval == USEC_INFINITY)
300 s->poll_limit_interval = 2 * USEC_PER_SEC;
301 if (s->poll_limit_burst == UINT_MAX)
302 s->poll_limit_burst = s->accept ? 150 : 15;
303
304 if (have_non_accept_socket(s)) {
305
306 if (!UNIT_DEREF(s->service)) {
307 Unit *x;
308
309 r = unit_load_related_unit(u, ".service", &x);
310 if (r < 0)
311 return r;
312
313 unit_ref_set(&s->service, u, x);
314 }
315
316 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
317 if (r < 0)
318 return r;
319 }
320
321 r = socket_add_mount_dependencies(s);
322 if (r < 0)
323 return r;
324
325 r = socket_add_device_dependencies(s);
326 if (r < 0)
327 return r;
328
329 r = unit_patch_contexts(u);
330 if (r < 0)
331 return r;
332
333 if (socket_has_exec(s)) {
334 r = unit_add_exec_dependencies(u, &s->exec_context);
335 if (r < 0)
336 return r;
337 }
338
339 r = unit_set_default_slice(u);
340 if (r < 0)
341 return r;
342
343 r = socket_add_default_dependencies(s);
344 if (r < 0)
345 return r;
346
347 return 0;
348 }
349
350 static const char *socket_find_symlink_target(Socket *s) {
351 const char *found = NULL;
352
353 LIST_FOREACH(port, p, s->ports) {
354 const char *f = NULL;
355
356 switch (p->type) {
357
358 case SOCKET_FIFO:
359 f = p->path;
360 break;
361
362 case SOCKET_SOCKET:
363 f = socket_address_get_path(&p->address);
364 break;
365
366 default:
367 break;
368 }
369
370 if (f) {
371 if (found)
372 return NULL;
373
374 found = f;
375 }
376 }
377
378 return found;
379 }
380
381 static int socket_verify(Socket *s) {
382 assert(s);
383 assert(UNIT(s)->load_state == UNIT_LOADED);
384
385 if (!s->ports)
386 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
387
388 if (s->accept && have_non_accept_socket(s))
389 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
390
391 if (s->accept && s->max_connections <= 0)
392 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "MaxConnection= setting too small. Refusing.");
393
394 if (s->accept && UNIT_DEREF(s->service))
395 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Explicit service configuration for accepting socket units not supported. Refusing.");
396
397 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
398 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
399
400 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s))
401 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.");
402
403 return 0;
404 }
405
406 static void peer_address_hash_func(const SocketPeer *s, struct siphash *state) {
407 assert(s);
408
409 if (s->peer.sa.sa_family == AF_INET)
410 siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
411 else if (s->peer.sa.sa_family == AF_INET6)
412 siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
413 else if (s->peer.sa.sa_family == AF_VSOCK)
414 siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
415 else
416 assert_not_reached();
417 }
418
419 static int peer_address_compare_func(const SocketPeer *x, const SocketPeer *y) {
420 int r;
421
422 r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
423 if (r != 0)
424 return r;
425
426 switch (x->peer.sa.sa_family) {
427 case AF_INET:
428 return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
429 case AF_INET6:
430 return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
431 case AF_VSOCK:
432 return CMP(x->peer.vm.svm_cid, y->peer.vm.svm_cid);
433 }
434 assert_not_reached();
435 }
436
437 DEFINE_PRIVATE_HASH_OPS(peer_address_hash_ops, SocketPeer, peer_address_hash_func, peer_address_compare_func);
438
439 static int socket_load(Unit *u) {
440 Socket *s = SOCKET(u);
441 int r;
442
443 assert(u);
444 assert(u->load_state == UNIT_STUB);
445
446 r = unit_load_fragment_and_dropin(u, true);
447 if (r < 0)
448 return r;
449
450 if (u->load_state != UNIT_LOADED)
451 return 0;
452
453 /* This is a new unit? Then let's add in some extras */
454 r = socket_add_extras(s);
455 if (r < 0)
456 return r;
457
458 return socket_verify(s);
459 }
460
461 static SocketPeer *socket_peer_new(void) {
462 SocketPeer *p;
463
464 p = new(SocketPeer, 1);
465 if (!p)
466 return NULL;
467
468 *p = (SocketPeer) {
469 .n_ref = 1,
470 };
471 return p;
472 }
473
474 static SocketPeer *socket_peer_free(SocketPeer *p) {
475 assert(p);
476
477 if (p->socket)
478 set_remove(p->socket->peers_by_address, p);
479
480 return mfree(p);
481 }
482
483 DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
484
485 int socket_acquire_peer(Socket *s, int fd, SocketPeer **ret) {
486 _cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
487 SocketPeer sa = {
488 .peer_salen = sizeof(union sockaddr_union),
489 }, *i;
490 int r;
491
492 assert(fd >= 0);
493 assert(s);
494 assert(ret);
495
496 if (getpeername(fd, &sa.peer.sa, &sa.peer_salen) < 0)
497 return log_unit_error_errno(UNIT(s), errno, "getpeername() failed: %m");
498
499 if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
500 *ret = NULL;
501 return 0;
502 }
503
504 i = set_get(s->peers_by_address, &sa);
505 if (i) {
506 *ret = socket_peer_ref(i);
507 return 1;
508 }
509
510 remote = socket_peer_new();
511 if (!remote)
512 return log_oom();
513
514 remote->peer = sa.peer;
515 remote->peer_salen = sa.peer_salen;
516
517 r = set_ensure_put(&s->peers_by_address, &peer_address_hash_ops, remote);
518 if (r < 0)
519 return log_unit_error_errno(UNIT(s), r, "Failed to insert peer info into hash table: %m");
520
521 remote->socket = s;
522
523 *ret = TAKE_PTR(remote);
524 return 1;
525 }
526
527 static const char* listen_lookup(int family, int type) {
528
529 if (family == AF_NETLINK)
530 return "ListenNetlink";
531
532 if (type == SOCK_STREAM)
533 return "ListenStream";
534 else if (type == SOCK_DGRAM)
535 return "ListenDatagram";
536 else if (type == SOCK_SEQPACKET)
537 return "ListenSequentialPacket";
538
539 assert_not_reached();
540 return NULL;
541 }
542
543 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
544 Socket *s = SOCKET(u);
545 const char *prefix2, *str;
546
547 assert(s);
548 assert(f);
549
550 prefix = strempty(prefix);
551 prefix2 = strjoina(prefix, "\t");
552
553 fprintf(f,
554 "%sSocket State: %s\n"
555 "%sResult: %s\n"
556 "%sClean Result: %s\n"
557 "%sBindIPv6Only: %s\n"
558 "%sBacklog: %u\n"
559 "%sSocketMode: %04o\n"
560 "%sDirectoryMode: %04o\n"
561 "%sKeepAlive: %s\n"
562 "%sNoDelay: %s\n"
563 "%sFreeBind: %s\n"
564 "%sTransparent: %s\n"
565 "%sBroadcast: %s\n"
566 "%sPassCredentials: %s\n"
567 "%sPassSecurity: %s\n"
568 "%sPassPacketInfo: %s\n"
569 "%sTCPCongestion: %s\n"
570 "%sRemoveOnStop: %s\n"
571 "%sWritable: %s\n"
572 "%sFileDescriptorName: %s\n"
573 "%sSELinuxContextFromNet: %s\n",
574 prefix, socket_state_to_string(s->state),
575 prefix, socket_result_to_string(s->result),
576 prefix, socket_result_to_string(s->clean_result),
577 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
578 prefix, s->backlog,
579 prefix, s->socket_mode,
580 prefix, s->directory_mode,
581 prefix, yes_no(s->keep_alive),
582 prefix, yes_no(s->no_delay),
583 prefix, yes_no(s->free_bind),
584 prefix, yes_no(s->transparent),
585 prefix, yes_no(s->broadcast),
586 prefix, yes_no(s->pass_cred),
587 prefix, yes_no(s->pass_sec),
588 prefix, yes_no(s->pass_pktinfo),
589 prefix, strna(s->tcp_congestion),
590 prefix, yes_no(s->remove_on_stop),
591 prefix, yes_no(s->writable),
592 prefix, socket_fdname(s),
593 prefix, yes_no(s->selinux_context_from_net));
594
595 if (s->timestamping != SOCKET_TIMESTAMPING_OFF)
596 fprintf(f,
597 "%sTimestamping: %s\n",
598 prefix, socket_timestamping_to_string(s->timestamping));
599
600 if (pidref_is_set(&s->control_pid))
601 fprintf(f,
602 "%sControl PID: "PID_FMT"\n",
603 prefix, s->control_pid.pid);
604
605 if (s->bind_to_device)
606 fprintf(f,
607 "%sBindToDevice: %s\n",
608 prefix, s->bind_to_device);
609
610 if (s->accept)
611 fprintf(f,
612 "%sAccepted: %u\n"
613 "%sNConnections: %u\n"
614 "%sMaxConnections: %u\n"
615 "%sMaxConnectionsPerSource: %u\n",
616 prefix, s->n_accepted,
617 prefix, s->n_connections,
618 prefix, s->max_connections,
619 prefix, s->max_connections_per_source);
620 else
621 fprintf(f,
622 "%sFlushPending: %s\n",
623 prefix, yes_no(s->flush_pending));
624
625
626 if (s->priority >= 0)
627 fprintf(f,
628 "%sPriority: %i\n",
629 prefix, s->priority);
630
631 if (s->receive_buffer > 0)
632 fprintf(f,
633 "%sReceiveBuffer: %zu\n",
634 prefix, s->receive_buffer);
635
636 if (s->send_buffer > 0)
637 fprintf(f,
638 "%sSendBuffer: %zu\n",
639 prefix, s->send_buffer);
640
641 if (s->ip_tos >= 0)
642 fprintf(f,
643 "%sIPTOS: %i\n",
644 prefix, s->ip_tos);
645
646 if (s->ip_ttl >= 0)
647 fprintf(f,
648 "%sIPTTL: %i\n",
649 prefix, s->ip_ttl);
650
651 if (s->pipe_size > 0)
652 fprintf(f,
653 "%sPipeSize: %zu\n",
654 prefix, s->pipe_size);
655
656 if (s->mark >= 0)
657 fprintf(f,
658 "%sMark: %i\n",
659 prefix, s->mark);
660
661 if (s->mq_maxmsg > 0)
662 fprintf(f,
663 "%sMessageQueueMaxMessages: %li\n",
664 prefix, s->mq_maxmsg);
665
666 if (s->mq_msgsize > 0)
667 fprintf(f,
668 "%sMessageQueueMessageSize: %li\n",
669 prefix, s->mq_msgsize);
670
671 if (s->reuse_port)
672 fprintf(f,
673 "%sReusePort: %s\n",
674 prefix, yes_no(s->reuse_port));
675
676 if (s->smack)
677 fprintf(f,
678 "%sSmackLabel: %s\n",
679 prefix, s->smack);
680
681 if (s->smack_ip_in)
682 fprintf(f,
683 "%sSmackLabelIPIn: %s\n",
684 prefix, s->smack_ip_in);
685
686 if (s->smack_ip_out)
687 fprintf(f,
688 "%sSmackLabelIPOut: %s\n",
689 prefix, s->smack_ip_out);
690
691 if (!isempty(s->user) || !isempty(s->group))
692 fprintf(f,
693 "%sSocketUser: %s\n"
694 "%sSocketGroup: %s\n",
695 prefix, strna(s->user),
696 prefix, strna(s->group));
697
698 if (timestamp_is_set(s->keep_alive_time))
699 fprintf(f,
700 "%sKeepAliveTimeSec: %s\n",
701 prefix, FORMAT_TIMESPAN(s->keep_alive_time, USEC_PER_SEC));
702
703 if (s->keep_alive_interval > 0)
704 fprintf(f,
705 "%sKeepAliveIntervalSec: %s\n",
706 prefix, FORMAT_TIMESPAN(s->keep_alive_interval, USEC_PER_SEC));
707
708 if (s->keep_alive_cnt > 0)
709 fprintf(f,
710 "%sKeepAliveProbes: %u\n",
711 prefix, s->keep_alive_cnt);
712
713 if (s->defer_accept > 0)
714 fprintf(f,
715 "%sDeferAcceptSec: %s\n",
716 prefix, FORMAT_TIMESPAN(s->defer_accept, USEC_PER_SEC));
717
718 LIST_FOREACH(port, p, s->ports) {
719
720 switch (p->type) {
721 case SOCKET_SOCKET: {
722 _cleanup_free_ char *k = NULL;
723 int r;
724
725 r = socket_address_print(&p->address, &k);
726 if (r < 0) {
727 errno = -r;
728 fprintf(f, "%s%s: %m\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type));
729 } else
730 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), k);
731 break;
732 }
733 case SOCKET_SPECIAL:
734 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
735 break;
736 case SOCKET_USB_FUNCTION:
737 fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
738 break;
739 case SOCKET_MQUEUE:
740 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
741 break;
742 default:
743 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
744 }
745 }
746
747 fprintf(f,
748 "%sTriggerLimitIntervalSec: %s\n"
749 "%sTriggerLimitBurst: %u\n"
750 "%sPollLimitIntervalSec: %s\n"
751 "%sPollLimitBurst: %u\n",
752 prefix, FORMAT_TIMESPAN(s->trigger_limit.interval, USEC_PER_SEC),
753 prefix, s->trigger_limit.burst,
754 prefix, FORMAT_TIMESPAN(s->poll_limit_interval, USEC_PER_SEC),
755 prefix, s->poll_limit_burst);
756
757 str = ip_protocol_to_name(s->socket_protocol);
758 if (str)
759 fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
760
761 if (!strv_isempty(s->symlinks)) {
762 fprintf(f, "%sSymlinks:", prefix);
763 STRV_FOREACH(q, s->symlinks)
764 fprintf(f, " %s", *q);
765
766 fprintf(f, "\n");
767 }
768
769 fprintf(f,
770 "%sTimeoutSec: %s\n",
771 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
772
773 exec_context_dump(&s->exec_context, f, prefix);
774 kill_context_dump(&s->kill_context, f, prefix);
775
776 for (SocketExecCommand c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
777 if (!s->exec_command[c])
778 continue;
779
780 fprintf(f, "%s-> %s:\n",
781 prefix, socket_exec_command_to_string(c));
782
783 exec_command_dump_list(s->exec_command[c], f, prefix2);
784 }
785
786 cgroup_context_dump(UNIT(s), f, prefix);
787 }
788
789 static int instance_from_socket(int fd, unsigned nr, char **instance) {
790 socklen_t l;
791 char *r;
792 union sockaddr_union local, remote;
793
794 assert(fd >= 0);
795 assert(instance);
796
797 l = sizeof(local);
798 if (getsockname(fd, &local.sa, &l) < 0)
799 return -errno;
800
801 l = sizeof(remote);
802 if (getpeername(fd, &remote.sa, &l) < 0)
803 return -errno;
804
805 switch (local.sa.sa_family) {
806
807 case AF_INET: {
808 uint32_t
809 a = be32toh(local.in.sin_addr.s_addr),
810 b = be32toh(remote.in.sin_addr.s_addr);
811
812 if (asprintf(&r,
813 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
814 nr,
815 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
816 be16toh(local.in.sin_port),
817 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
818 be16toh(remote.in.sin_port)) < 0)
819 return -ENOMEM;
820
821 break;
822 }
823
824 case AF_INET6: {
825 static const unsigned char ipv4_prefix[] = {
826 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
827 };
828
829 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
830 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
831 const uint8_t
832 *a = local.in6.sin6_addr.s6_addr+12,
833 *b = remote.in6.sin6_addr.s6_addr+12;
834
835 if (asprintf(&r,
836 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
837 nr,
838 a[0], a[1], a[2], a[3],
839 be16toh(local.in6.sin6_port),
840 b[0], b[1], b[2], b[3],
841 be16toh(remote.in6.sin6_port)) < 0)
842 return -ENOMEM;
843 } else {
844 if (asprintf(&r,
845 "%u-%s:%u-%s:%u",
846 nr,
847 IN6_ADDR_TO_STRING(&local.in6.sin6_addr),
848 be16toh(local.in6.sin6_port),
849 IN6_ADDR_TO_STRING(&remote.in6.sin6_addr),
850 be16toh(remote.in6.sin6_port)) < 0)
851 return -ENOMEM;
852 }
853
854 break;
855 }
856
857 case AF_UNIX: {
858 struct ucred ucred;
859 int k;
860
861 k = getpeercred(fd, &ucred);
862 if (k >= 0) {
863 if (asprintf(&r,
864 "%u-"PID_FMT"-"UID_FMT,
865 nr, ucred.pid, ucred.uid) < 0)
866 return -ENOMEM;
867 } else if (k == -ENODATA) {
868 /* This handles the case where somebody is
869 * connecting from another pid/uid namespace
870 * (e.g. from outside of our container). */
871 if (asprintf(&r,
872 "%u-unknown",
873 nr) < 0)
874 return -ENOMEM;
875 } else
876 return k;
877
878 break;
879 }
880
881 case AF_VSOCK:
882 if (asprintf(&r,
883 "%u-%u:%u-%u:%u",
884 nr,
885 local.vm.svm_cid, local.vm.svm_port,
886 remote.vm.svm_cid, remote.vm.svm_port) < 0)
887 return -ENOMEM;
888
889 break;
890
891 default:
892 assert_not_reached();
893 }
894
895 *instance = r;
896 return 0;
897 }
898
899 static void socket_close_fds(Socket *s) {
900 assert(s);
901
902 LIST_FOREACH(port, p, s->ports) {
903 bool was_open;
904
905 was_open = p->fd >= 0;
906
907 p->event_source = sd_event_source_disable_unref(p->event_source);
908 p->fd = safe_close(p->fd);
909 socket_cleanup_fd_list(p);
910
911 /* One little note: we should normally not delete any sockets in the file system here! After all some
912 * other process we spawned might still have a reference of this fd and wants to continue to use
913 * it. Therefore we normally delete sockets in the file system before we create a new one, not after we
914 * stopped using one! That all said, if the user explicitly requested this, we'll delete them here
915 * anyway, but only then. */
916
917 if (!was_open || !s->remove_on_stop)
918 continue;
919
920 switch (p->type) {
921
922 case SOCKET_FIFO:
923 (void) unlink(p->path);
924 break;
925
926 case SOCKET_MQUEUE:
927 (void) mq_unlink(p->path);
928 break;
929
930 case SOCKET_SOCKET:
931 (void) socket_address_unlink(&p->address);
932 break;
933
934 default:
935 break;
936 }
937 }
938
939 if (s->remove_on_stop)
940 STRV_FOREACH(i, s->symlinks)
941 (void) unlink(*i);
942
943 /* Note that we don't return NULL here, since s has not been freed. */
944 }
945
946 static void socket_apply_socket_options(Socket *s, SocketPort *p, int fd) {
947 int r;
948
949 assert(s);
950 assert(p);
951 assert(fd >= 0);
952
953 if (s->keep_alive) {
954 r = setsockopt_int(fd, SOL_SOCKET, SO_KEEPALIVE, true);
955 if (r < 0)
956 log_unit_warning_errno(UNIT(s), r, "SO_KEEPALIVE failed: %m");
957 }
958
959 if (timestamp_is_set(s->keep_alive_time)) {
960 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPIDLE, s->keep_alive_time / USEC_PER_SEC);
961 if (r < 0)
962 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPIDLE failed: %m");
963 }
964
965 if (s->keep_alive_interval > 0) {
966 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPINTVL, s->keep_alive_interval / USEC_PER_SEC);
967 if (r < 0)
968 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPINTVL failed: %m");
969 }
970
971 if (s->keep_alive_cnt > 0) {
972 r = setsockopt_int(fd, SOL_TCP, TCP_KEEPCNT, s->keep_alive_cnt);
973 if (r < 0)
974 log_unit_warning_errno(UNIT(s), r, "TCP_KEEPCNT failed: %m");
975 }
976
977 if (s->defer_accept > 0) {
978 r = setsockopt_int(fd, SOL_TCP, TCP_DEFER_ACCEPT, s->defer_accept / USEC_PER_SEC);
979 if (r < 0)
980 log_unit_warning_errno(UNIT(s), r, "TCP_DEFER_ACCEPT failed: %m");
981 }
982
983 if (s->no_delay) {
984 if (s->socket_protocol == IPPROTO_SCTP) {
985 r = setsockopt_int(fd, SOL_SCTP, SCTP_NODELAY, true);
986 if (r < 0)
987 log_unit_warning_errno(UNIT(s), r, "SCTP_NODELAY failed: %m");
988 } else {
989 r = setsockopt_int(fd, SOL_TCP, TCP_NODELAY, true);
990 if (r < 0)
991 log_unit_warning_errno(UNIT(s), r, "TCP_NODELAY failed: %m");
992 }
993 }
994
995 if (s->broadcast) {
996 r = setsockopt_int(fd, SOL_SOCKET, SO_BROADCAST, true);
997 if (r < 0)
998 log_unit_warning_errno(UNIT(s), r, "SO_BROADCAST failed: %m");
999 }
1000
1001 if (s->pass_cred) {
1002 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1003 if (r < 0)
1004 log_unit_warning_errno(UNIT(s), r, "SO_PASSCRED failed: %m");
1005 }
1006
1007 if (s->pass_sec) {
1008 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSSEC, true);
1009 if (r < 0)
1010 log_unit_warning_errno(UNIT(s), r, "SO_PASSSEC failed: %m");
1011 }
1012
1013 if (s->pass_pktinfo) {
1014 r = socket_set_recvpktinfo(fd, socket_address_family(&p->address), true);
1015 if (r < 0)
1016 log_unit_warning_errno(UNIT(s), r, "Failed to enable packet info socket option: %m");
1017 }
1018
1019 if (s->timestamping != SOCKET_TIMESTAMPING_OFF) {
1020 r = setsockopt_int(fd, SOL_SOCKET,
1021 s->timestamping == SOCKET_TIMESTAMPING_NS ? SO_TIMESTAMPNS : SO_TIMESTAMP,
1022 true);
1023 if (r < 0)
1024 log_unit_warning_errno(UNIT(s), r, "Failed to enable timestamping socket option, ignoring: %m");
1025 }
1026
1027 if (s->priority >= 0) {
1028 r = setsockopt_int(fd, SOL_SOCKET, SO_PRIORITY, s->priority);
1029 if (r < 0)
1030 log_unit_warning_errno(UNIT(s), r, "SO_PRIORITY failed: %m");
1031 }
1032
1033 if (s->receive_buffer > 0) {
1034 r = fd_set_rcvbuf(fd, s->receive_buffer, false);
1035 if (r < 0)
1036 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1037 "SO_RCVBUF/SO_RCVBUFFORCE failed: %m");
1038 }
1039
1040 if (s->send_buffer > 0) {
1041 r = fd_set_sndbuf(fd, s->send_buffer, false);
1042 if (r < 0)
1043 log_unit_full_errno(UNIT(s), ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_WARNING, r,
1044 "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
1045 }
1046
1047 if (s->mark >= 0) {
1048 r = setsockopt_int(fd, SOL_SOCKET, SO_MARK, s->mark);
1049 if (r < 0)
1050 log_unit_warning_errno(UNIT(s), r, "SO_MARK failed: %m");
1051 }
1052
1053 if (s->ip_tos >= 0) {
1054 r = setsockopt_int(fd, IPPROTO_IP, IP_TOS, s->ip_tos);
1055 if (r < 0)
1056 log_unit_warning_errno(UNIT(s), r, "IP_TOS failed: %m");
1057 }
1058
1059 if (s->ip_ttl >= 0) {
1060 r = socket_set_ttl(fd, socket_address_family(&p->address), s->ip_ttl);
1061 if (r < 0)
1062 log_unit_warning_errno(UNIT(s), r, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
1063 }
1064
1065 if (s->tcp_congestion)
1066 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
1067 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
1068
1069 if (s->smack_ip_in) {
1070 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
1071 if (r < 0)
1072 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
1073 }
1074
1075 if (s->smack_ip_out) {
1076 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
1077 if (r < 0)
1078 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
1079 }
1080 }
1081
1082 static void socket_apply_fifo_options(Socket *s, int fd) {
1083 int r;
1084
1085 assert(s);
1086 assert(fd >= 0);
1087
1088 if (s->pipe_size > 0)
1089 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
1090 log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m");
1091
1092 if (s->smack) {
1093 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
1094 if (r < 0)
1095 log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m");
1096 }
1097 }
1098
1099 static int fifo_address_create(
1100 const char *path,
1101 mode_t directory_mode,
1102 mode_t socket_mode) {
1103
1104 _cleanup_close_ int fd = -EBADF;
1105 mode_t old_mask;
1106 struct stat st;
1107 int r;
1108
1109 assert(path);
1110
1111 (void) mkdir_parents_label(path, directory_mode);
1112
1113 r = mac_selinux_create_file_prepare(path, S_IFIFO);
1114 if (r < 0)
1115 return r;
1116
1117 /* Enforce the right access mode for the fifo */
1118 old_mask = umask(~socket_mode);
1119
1120 /* Include the original umask in our mask */
1121 (void) umask(~socket_mode | old_mask);
1122
1123 r = mkfifo(path, socket_mode);
1124 (void) umask(old_mask);
1125
1126 if (r < 0 && errno != EEXIST) {
1127 r = -errno;
1128 goto fail;
1129 }
1130
1131 fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
1132 if (fd < 0) {
1133 r = -errno;
1134 goto fail;
1135 }
1136
1137 mac_selinux_create_file_clear();
1138
1139 if (fstat(fd, &st) < 0) {
1140 r = -errno;
1141 goto fail;
1142 }
1143
1144 if (!S_ISFIFO(st.st_mode) ||
1145 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1146 st.st_uid != getuid() ||
1147 st.st_gid != getgid()) {
1148 r = -EEXIST;
1149 goto fail;
1150 }
1151
1152 return TAKE_FD(fd);
1153
1154 fail:
1155 mac_selinux_create_file_clear();
1156 return r;
1157 }
1158
1159 static int special_address_create(const char *path, bool writable) {
1160 _cleanup_close_ int fd = -EBADF;
1161 struct stat st;
1162
1163 assert(path);
1164
1165 fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1166 if (fd < 0)
1167 return -errno;
1168
1169 if (fstat(fd, &st) < 0)
1170 return -errno;
1171
1172 /* Check whether this is a /proc, /sys or /dev file or char device */
1173 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode))
1174 return -EEXIST;
1175
1176 return TAKE_FD(fd);
1177 }
1178
1179 static int usbffs_address_create(const char *path) {
1180 _cleanup_close_ int fd = -EBADF;
1181 struct stat st;
1182
1183 assert(path);
1184
1185 fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1186 if (fd < 0)
1187 return -errno;
1188
1189 if (fstat(fd, &st) < 0)
1190 return -errno;
1191
1192 /* Check whether this is a regular file (ffs endpoint) */
1193 if (!S_ISREG(st.st_mode))
1194 return -EEXIST;
1195
1196 return TAKE_FD(fd);
1197 }
1198
1199 static int mq_address_create(
1200 const char *path,
1201 mode_t mq_mode,
1202 long maxmsg,
1203 long msgsize) {
1204
1205 _cleanup_close_ int fd = -EBADF;
1206 struct stat st;
1207 mode_t old_mask;
1208 struct mq_attr _attr, *attr = NULL;
1209
1210 assert(path);
1211
1212 if (maxmsg > 0 && msgsize > 0) {
1213 _attr = (struct mq_attr) {
1214 .mq_flags = O_NONBLOCK,
1215 .mq_maxmsg = maxmsg,
1216 .mq_msgsize = msgsize,
1217 };
1218 attr = &_attr;
1219 }
1220
1221 /* Enforce the right access mode for the mq */
1222 old_mask = umask(~mq_mode);
1223
1224 /* Include the original umask in our mask */
1225 (void) umask(~mq_mode | old_mask);
1226 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1227 (void) umask(old_mask);
1228
1229 if (fd < 0)
1230 return -errno;
1231
1232 if (fstat(fd, &st) < 0)
1233 return -errno;
1234
1235 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1236 st.st_uid != getuid() ||
1237 st.st_gid != getgid())
1238 return -EEXIST;
1239
1240 return TAKE_FD(fd);
1241 }
1242
1243 static int socket_symlink(Socket *s) {
1244 const char *p;
1245 int r;
1246
1247 assert(s);
1248
1249 p = socket_find_symlink_target(s);
1250 if (!p)
1251 return 0;
1252
1253 STRV_FOREACH(i, s->symlinks) {
1254 (void) mkdir_parents_label(*i, s->directory_mode);
1255
1256 r = symlink_idempotent(p, *i, false);
1257
1258 if (r == -EEXIST && s->remove_on_stop) {
1259 /* If there's already something where we want to create the symlink, and the destructive
1260 * RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
1261 * again. */
1262
1263 if (unlink(*i) >= 0)
1264 r = symlink_idempotent(p, *i, false);
1265 }
1266
1267 if (r < 0)
1268 log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s %s %s, ignoring: %m",
1269 p, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *i);
1270 }
1271
1272 return 0;
1273 }
1274
1275 static int usbffs_write_descs(int fd, Service *s) {
1276 int r;
1277
1278 if (!s->usb_function_descriptors || !s->usb_function_strings)
1279 return -EINVAL;
1280
1281 r = copy_file_fd(s->usb_function_descriptors, fd, 0);
1282 if (r < 0)
1283 return r;
1284
1285 return copy_file_fd(s->usb_function_strings, fd, 0);
1286 }
1287
1288 static int usbffs_select_ep(const struct dirent *d) {
1289 return d->d_name[0] != '.' && !streq(d->d_name, "ep0");
1290 }
1291
1292 static int usbffs_dispatch_eps(SocketPort *p) {
1293 _cleanup_free_ struct dirent **ent = NULL;
1294 size_t n, k;
1295 int r;
1296
1297 r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
1298 if (r < 0)
1299 return -errno;
1300
1301 n = (size_t) r;
1302 p->auxiliary_fds = new(int, n);
1303 if (!p->auxiliary_fds) {
1304 r = -ENOMEM;
1305 goto clear;
1306 }
1307
1308 p->n_auxiliary_fds = n;
1309
1310 k = 0;
1311 for (size_t i = 0; i < n; ++i) {
1312 _cleanup_free_ char *ep = NULL;
1313
1314 ep = path_make_absolute(ent[i]->d_name, p->path);
1315 if (!ep) {
1316 r = -ENOMEM;
1317 goto fail;
1318 }
1319
1320 path_simplify(ep);
1321
1322 r = usbffs_address_create(ep);
1323 if (r < 0)
1324 goto fail;
1325
1326 p->auxiliary_fds[k++] = r;
1327 }
1328
1329 r = 0;
1330 goto clear;
1331
1332 fail:
1333 close_many(p->auxiliary_fds, k);
1334 p->auxiliary_fds = mfree(p->auxiliary_fds);
1335 p->n_auxiliary_fds = 0;
1336
1337 clear:
1338 free_many((void**) ent, n);
1339 return r;
1340 }
1341
1342 int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
1343 /* Figure out what the unit that will be used to handle the connections on the socket looks like.
1344 *
1345 * If cfd < 0, then we don't have a connection yet. In case of Accept=yes sockets, use a fake
1346 * instance name.
1347 */
1348
1349 if (UNIT_ISSET(s->service)) {
1350 *ret = UNIT_DEREF(s->service);
1351 return 0;
1352 }
1353
1354 if (!s->accept)
1355 return -ENODATA;
1356
1357 /* Build the instance name and load the unit */
1358 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1359 int r;
1360
1361 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1362 if (r < 0)
1363 return r;
1364
1365 if (cfd >= 0) {
1366 r = instance_from_socket(cfd, s->n_accepted, &instance);
1367 if (r < 0) {
1368 if (ERRNO_IS_DISCONNECT(r))
1369 /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
1370 * different errors. This connection is over, but the socket unit lives on. */
1371 return log_unit_debug_errno(UNIT(s), r,
1372 "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
1373 errno_to_name(r));
1374 return r;
1375 }
1376 }
1377
1378 /* For accepting sockets, we don't know how the instance will be called until we get a connection and
1379 * can figure out what the peer name is. So let's use "internal" as the instance to make it clear
1380 * that this is not an actual peer name. We use "unknown" when we cannot figure out the peer. */
1381 r = unit_name_build(prefix, instance ?: "internal", ".service", &name);
1382 if (r < 0)
1383 return r;
1384
1385 return manager_load_unit(UNIT(s)->manager, name, NULL, NULL, ret);
1386 }
1387
1388 static int socket_determine_selinux_label(Socket *s, char **ret) {
1389 int r;
1390
1391 assert(s);
1392 assert(ret);
1393
1394 Unit *service;
1395 ExecCommand *c;
1396 const char *exec_context;
1397 _cleanup_free_ char *path = NULL;
1398
1399 r = socket_load_service_unit(s, -1, &service);
1400 if (r == -ENODATA)
1401 goto no_label;
1402 if (r < 0)
1403 return r;
1404
1405 exec_context = SERVICE(service)->exec_context.selinux_context;
1406 if (exec_context) {
1407 char *con;
1408
1409 con = strdup(exec_context);
1410 if (!con)
1411 return -ENOMEM;
1412
1413 *ret = TAKE_PTR(con);
1414 return 0;
1415 }
1416
1417 c = SERVICE(service)->exec_command[SERVICE_EXEC_START];
1418 if (!c)
1419 goto no_label;
1420
1421 r = chase(c->path, SERVICE(service)->exec_context.root_directory, CHASE_PREFIX_ROOT, &path, NULL);
1422 if (r < 0)
1423 goto no_label;
1424
1425 r = mac_selinux_get_create_label_from_exe(path, ret);
1426 if (IN_SET(r, -EPERM, -EOPNOTSUPP))
1427 goto no_label;
1428 return r;
1429
1430 no_label:
1431 *ret = NULL;
1432 return 0;
1433 }
1434
1435 static int socket_address_listen_do(
1436 Socket *s,
1437 const SocketAddress *address,
1438 const char *label) {
1439
1440 assert(s);
1441 assert(address);
1442
1443 return socket_address_listen(
1444 address,
1445 SOCK_CLOEXEC|SOCK_NONBLOCK,
1446 s->backlog,
1447 s->bind_ipv6_only,
1448 s->bind_to_device,
1449 s->reuse_port,
1450 s->free_bind,
1451 s->transparent,
1452 s->directory_mode,
1453 s->socket_mode,
1454 label);
1455 }
1456
1457 #define log_address_error_errno(u, address, error, fmt) \
1458 ({ \
1459 _cleanup_free_ char *_t = NULL; \
1460 \
1461 (void) socket_address_print(address, &_t); \
1462 log_unit_error_errno(u, error, fmt, strna(_t)); \
1463 })
1464
1465 static int fork_needed(const SocketAddress *address, Socket *s) {
1466 int r;
1467
1468 assert(address);
1469 assert(s);
1470
1471 /* Check if we need to do the cgroup or netns stuff. If not we can do things much simpler. */
1472
1473 /* If there are any NFTSet= directives with cgroup source, we need the cgroup */
1474 Unit *u = UNIT(s);
1475 CGroupContext *c = unit_get_cgroup_context(u);
1476 if (c)
1477 FOREACH_ARRAY(nft_set, c->nft_set_context.sets, c->nft_set_context.n_sets)
1478 if (nft_set->source == NFT_SET_SOURCE_CGROUP)
1479 return true;
1480
1481 if (IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6)) {
1482 r = bpf_firewall_supported();
1483 if (r < 0)
1484 return r;
1485 if (r != BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
1486 return true;
1487 }
1488
1489 return exec_needs_network_namespace(&s->exec_context);
1490 }
1491
1492 static int socket_address_listen_in_cgroup(
1493 Socket *s,
1494 const SocketAddress *address,
1495 const char *label) {
1496
1497 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1498 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
1499 int fd, r;
1500
1501 assert(s);
1502 assert(address);
1503
1504 /* This is a wrapper around socket_address_listen(), that forks off a helper process inside the
1505 * socket's cgroup and network namespace in which the socket is actually created. This way we ensure
1506 * the socket is actually properly attached to the unit's cgroup for the purpose of BPF filtering and
1507 * such. */
1508
1509 r = fork_needed(address, s);
1510 if (r < 0)
1511 return r;
1512 if (r == 0) {
1513 /* Shortcut things... */
1514 fd = socket_address_listen_do(s, address, label);
1515 if (fd < 0)
1516 return log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1517
1518 return fd;
1519 }
1520
1521 r = unit_setup_exec_runtime(UNIT(s));
1522 if (r < 0)
1523 return log_unit_error_errno(UNIT(s), r, "Failed acquire runtime: %m");
1524
1525 if (s->exec_context.network_namespace_path &&
1526 s->exec_runtime &&
1527 s->exec_runtime->shared &&
1528 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1529 r = open_shareable_ns_path(s->exec_runtime->shared->netns_storage_socket, s->exec_context.network_namespace_path, CLONE_NEWNET);
1530 if (r < 0)
1531 return log_unit_error_errno(UNIT(s), r, "Failed to open network namespace path %s: %m", s->exec_context.network_namespace_path);
1532 }
1533
1534 if (s->exec_context.ipc_namespace_path &&
1535 s->exec_runtime &&
1536 s->exec_runtime->shared &&
1537 s->exec_runtime->shared->ipcns_storage_socket[0] >= 0) {
1538 r = open_shareable_ns_path(s->exec_runtime->shared->ipcns_storage_socket, s->exec_context.ipc_namespace_path, CLONE_NEWIPC);
1539 if (r < 0)
1540 return log_unit_error_errno(UNIT(s), r, "Failed to open IPC namespace path %s: %m", s->exec_context.ipc_namespace_path);
1541 }
1542
1543 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
1544 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
1545
1546 r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
1547 if (r < 0)
1548 return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
1549 if (r == 0) {
1550 /* Child */
1551
1552 pair[0] = safe_close(pair[0]);
1553
1554 if (exec_needs_network_namespace(&s->exec_context) &&
1555 s->exec_runtime &&
1556 s->exec_runtime->shared &&
1557 s->exec_runtime->shared->netns_storage_socket[0] >= 0) {
1558
1559 if (ns_type_supported(NAMESPACE_NET)) {
1560 r = setup_shareable_ns(s->exec_runtime->shared->netns_storage_socket, CLONE_NEWNET);
1561 if (r < 0) {
1562 log_unit_error_errno(UNIT(s), r, "Failed to join network namespace: %m");
1563 _exit(EXIT_NETWORK);
1564 }
1565 } else if (s->exec_context.network_namespace_path) {
1566 log_unit_error(UNIT(s), "Network namespace path configured but network namespaces not supported.");
1567 _exit(EXIT_NETWORK);
1568 } else
1569 log_unit_warning(UNIT(s), "PrivateNetwork=yes is configured, but the kernel does not support network namespaces, ignoring.");
1570 }
1571
1572 fd = socket_address_listen_do(s, address, label);
1573 if (fd < 0) {
1574 log_address_error_errno(UNIT(s), address, fd, "Failed to create listening socket (%s): %m");
1575 _exit(EXIT_FAILURE);
1576 }
1577
1578 r = send_one_fd(pair[1], fd, 0);
1579 if (r < 0) {
1580 log_address_error_errno(UNIT(s), address, r, "Failed to send listening socket (%s) to parent: %m");
1581 _exit(EXIT_FAILURE);
1582 }
1583
1584 _exit(EXIT_SUCCESS);
1585 }
1586
1587 pair[1] = safe_close(pair[1]);
1588 fd = receive_one_fd(pair[0], 0);
1589
1590 /* We synchronously wait for the helper, as it shouldn't be slow */
1591 r = wait_for_terminate_and_check("(sd-listen)", pid.pid, WAIT_LOG_ABNORMAL);
1592 if (r < 0) {
1593 safe_close(fd);
1594 return r;
1595 }
1596
1597 if (fd < 0)
1598 return log_address_error_errno(UNIT(s), address, fd, "Failed to receive listening socket (%s): %m");
1599
1600 return fd;
1601 }
1602
1603 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(Socket *, socket_close_fds, NULL);
1604
1605 static int socket_open_fds(Socket *orig_s) {
1606 _cleanup_(socket_close_fdsp) Socket *s = orig_s;
1607 _cleanup_(mac_selinux_freep) char *label = NULL;
1608 bool know_label = false;
1609 int r;
1610
1611 assert(s);
1612
1613 LIST_FOREACH(port, p, s->ports) {
1614
1615 if (p->fd >= 0)
1616 continue;
1617
1618 switch (p->type) {
1619
1620 case SOCKET_SOCKET:
1621
1622 if (!know_label) {
1623 /* Figure out the label, if we don't it know yet. We do it once for the first
1624 * socket where we need this and remember it for the rest. */
1625
1626 r = socket_determine_selinux_label(s, &label);
1627 if (r < 0)
1628 return log_unit_error_errno(UNIT(s), r, "Failed to determine SELinux label: %m");
1629
1630 know_label = true;
1631 }
1632
1633 /* Apply the socket protocol */
1634 switch (p->address.type) {
1635
1636 case SOCK_STREAM:
1637 case SOCK_SEQPACKET:
1638 if (s->socket_protocol == IPPROTO_SCTP)
1639 p->address.protocol = s->socket_protocol;
1640 break;
1641
1642 case SOCK_DGRAM:
1643 if (s->socket_protocol == IPPROTO_UDPLITE)
1644 p->address.protocol = s->socket_protocol;
1645 break;
1646 }
1647
1648 p->fd = socket_address_listen_in_cgroup(s, &p->address, label);
1649 if (p->fd < 0)
1650 return p->fd;
1651
1652 socket_apply_socket_options(s, p, p->fd);
1653 socket_symlink(s);
1654 break;
1655
1656 case SOCKET_SPECIAL:
1657
1658 p->fd = special_address_create(p->path, s->writable);
1659 if (p->fd < 0)
1660 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open special file %s: %m", p->path);
1661 break;
1662
1663 case SOCKET_FIFO:
1664
1665 p->fd = fifo_address_create(
1666 p->path,
1667 s->directory_mode,
1668 s->socket_mode);
1669 if (p->fd < 0)
1670 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open FIFO %s: %m", p->path);
1671
1672 socket_apply_fifo_options(s, p->fd);
1673 socket_symlink(s);
1674 break;
1675
1676 case SOCKET_MQUEUE:
1677
1678 p->fd = mq_address_create(
1679 p->path,
1680 s->socket_mode,
1681 s->mq_maxmsg,
1682 s->mq_msgsize);
1683 if (p->fd < 0)
1684 return log_unit_error_errno(UNIT(s), p->fd, "Failed to open message queue %s: %m", p->path);
1685 break;
1686
1687 case SOCKET_USB_FUNCTION: {
1688 _cleanup_free_ char *ep = NULL;
1689
1690 ep = path_make_absolute("ep0", p->path);
1691 if (!ep)
1692 return -ENOMEM;
1693
1694 p->fd = usbffs_address_create(ep);
1695 if (p->fd < 0)
1696 return p->fd;
1697
1698 r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service)));
1699 if (r < 0)
1700 return r;
1701
1702 r = usbffs_dispatch_eps(p);
1703 if (r < 0)
1704 return r;
1705
1706 break;
1707 }
1708 default:
1709 assert_not_reached();
1710 }
1711 }
1712
1713 s = NULL;
1714 return 0;
1715 }
1716
1717 static void socket_unwatch_fds(Socket *s) {
1718 int r;
1719
1720 assert(s);
1721
1722 LIST_FOREACH(port, p, s->ports) {
1723 if (p->fd < 0)
1724 continue;
1725
1726 if (!p->event_source)
1727 continue;
1728
1729 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1730 if (r < 0)
1731 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1732 }
1733 }
1734
1735 static int socket_watch_fds(Socket *s) {
1736 int r;
1737
1738 assert(s);
1739
1740 LIST_FOREACH(port, p, s->ports) {
1741 if (p->fd < 0)
1742 continue;
1743
1744 if (p->event_source) {
1745 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1746 if (r < 0)
1747 goto fail;
1748 } else {
1749 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1750 if (r < 0)
1751 goto fail;
1752
1753 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1754 }
1755
1756 r = sd_event_source_set_ratelimit(p->event_source, s->poll_limit_interval, s->poll_limit_burst);
1757 if (r < 0)
1758 log_unit_debug_errno(UNIT(s), r, "Failed to set poll limit on I/O event source, ignoring: %m");
1759 }
1760
1761 return 0;
1762
1763 fail:
1764 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1765 socket_unwatch_fds(s);
1766 return r;
1767 }
1768
1769 enum {
1770 SOCKET_OPEN_NONE,
1771 SOCKET_OPEN_SOME,
1772 SOCKET_OPEN_ALL,
1773 };
1774
1775 static int socket_check_open(Socket *s) {
1776 bool have_open = false, have_closed = false;
1777
1778 assert(s);
1779
1780 LIST_FOREACH(port, p, s->ports) {
1781 if (p->fd < 0)
1782 have_closed = true;
1783 else
1784 have_open = true;
1785
1786 if (have_open && have_closed)
1787 return SOCKET_OPEN_SOME;
1788 }
1789
1790 if (have_open)
1791 return SOCKET_OPEN_ALL;
1792
1793 return SOCKET_OPEN_NONE;
1794 }
1795
1796 static void socket_set_state(Socket *s, SocketState state) {
1797 SocketState old_state;
1798 assert(s);
1799
1800 if (s->state != state)
1801 bus_unit_send_pending_change_signal(UNIT(s), false);
1802
1803 old_state = s->state;
1804 s->state = state;
1805
1806 if (!IN_SET(state,
1807 SOCKET_START_PRE,
1808 SOCKET_START_CHOWN,
1809 SOCKET_START_POST,
1810 SOCKET_STOP_PRE,
1811 SOCKET_STOP_PRE_SIGTERM,
1812 SOCKET_STOP_PRE_SIGKILL,
1813 SOCKET_STOP_POST,
1814 SOCKET_FINAL_SIGTERM,
1815 SOCKET_FINAL_SIGKILL,
1816 SOCKET_CLEANING)) {
1817
1818 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1819 socket_unwatch_control_pid(s);
1820 s->control_command = NULL;
1821 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1822 }
1823
1824 if (state != SOCKET_LISTENING)
1825 socket_unwatch_fds(s);
1826
1827 if (!IN_SET(state,
1828 SOCKET_START_CHOWN,
1829 SOCKET_START_POST,
1830 SOCKET_LISTENING,
1831 SOCKET_RUNNING,
1832 SOCKET_STOP_PRE,
1833 SOCKET_STOP_PRE_SIGTERM,
1834 SOCKET_STOP_PRE_SIGKILL,
1835 SOCKET_CLEANING))
1836 socket_close_fds(s);
1837
1838 if (state != old_state)
1839 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1840
1841 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
1842 }
1843
1844 static int socket_coldplug(Unit *u) {
1845 Socket *s = SOCKET(u);
1846 int r;
1847
1848 assert(s);
1849 assert(s->state == SOCKET_DEAD);
1850
1851 if (s->deserialized_state == s->state)
1852 return 0;
1853
1854 if (pidref_is_set(&s->control_pid) &&
1855 pid_is_unwaited(s->control_pid.pid) &&
1856 IN_SET(s->deserialized_state,
1857 SOCKET_START_PRE,
1858 SOCKET_START_CHOWN,
1859 SOCKET_START_POST,
1860 SOCKET_STOP_PRE,
1861 SOCKET_STOP_PRE_SIGTERM,
1862 SOCKET_STOP_PRE_SIGKILL,
1863 SOCKET_STOP_POST,
1864 SOCKET_FINAL_SIGTERM,
1865 SOCKET_FINAL_SIGKILL,
1866 SOCKET_CLEANING)) {
1867
1868 r = unit_watch_pid(UNIT(s), s->control_pid.pid, /* exclusive= */ false);
1869 if (r < 0)
1870 return r;
1871
1872 r = socket_arm_timer(s, /* relative= */ false, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
1873 if (r < 0)
1874 return r;
1875 }
1876
1877 if (IN_SET(s->deserialized_state,
1878 SOCKET_START_CHOWN,
1879 SOCKET_START_POST,
1880 SOCKET_LISTENING,
1881 SOCKET_RUNNING)) {
1882
1883 /* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
1884 * for. However, this is problematic, as we won't traverse through the SOCKET_START_CHOWN state for
1885 * them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
1886 * and if there's a mismatch, warn loudly. */
1887
1888 r = socket_check_open(s);
1889 if (r == SOCKET_OPEN_NONE)
1890 log_unit_warning(UNIT(s),
1891 "Socket unit configuration has changed while unit has been running, "
1892 "no open socket file descriptor left. "
1893 "The socket unit is not functional until restarted.");
1894 else if (r == SOCKET_OPEN_SOME)
1895 log_unit_warning(UNIT(s),
1896 "Socket unit configuration has changed while unit has been running, "
1897 "and some socket file descriptors have not been opened yet. "
1898 "The socket unit is not fully functional until restarted.");
1899 }
1900
1901 if (s->deserialized_state == SOCKET_LISTENING) {
1902 r = socket_watch_fds(s);
1903 if (r < 0)
1904 return r;
1905 }
1906
1907 if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED, SOCKET_CLEANING))
1908 (void) unit_setup_exec_runtime(u);
1909
1910 socket_set_state(s, s->deserialized_state);
1911 return 0;
1912 }
1913
1914 static int socket_spawn(Socket *s, ExecCommand *c, PidRef *ret_pid) {
1915
1916 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1917 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
1918 .stdin_fd = -EBADF,
1919 .stdout_fd = -EBADF,
1920 .stderr_fd = -EBADF,
1921 .exec_fd = -EBADF,
1922 };
1923 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1924 pid_t pid;
1925 int r;
1926
1927 assert(s);
1928 assert(c);
1929 assert(ret_pid);
1930
1931 r = unit_prepare_exec(UNIT(s));
1932 if (r < 0)
1933 return r;
1934
1935 r = socket_arm_timer(s, /* relative= */ true, s->timeout_usec);
1936 if (r < 0)
1937 return r;
1938
1939 r = unit_set_exec_params(UNIT(s), &exec_params);
1940 if (r < 0)
1941 return r;
1942
1943 r = exec_spawn(UNIT(s),
1944 c,
1945 &s->exec_context,
1946 &exec_params,
1947 s->exec_runtime,
1948 &s->cgroup_context,
1949 &pid);
1950 if (r < 0)
1951 return r;
1952
1953 r = pidref_set_pid(&pidref, pid);
1954 if (r < 0)
1955 return r;
1956
1957 r = unit_watch_pid(UNIT(s), pidref.pid, /* exclusive= */ true);
1958 if (r < 0)
1959 return r;
1960
1961 *ret_pid = TAKE_PIDREF(pidref);
1962 return 0;
1963 }
1964
1965 static int socket_chown(Socket *s, PidRef *ret_pid) {
1966 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
1967 int r;
1968
1969 assert(s);
1970
1971 r = socket_arm_timer(s, /* relative= */ true, s->timeout_usec);
1972 if (r < 0)
1973 return r;
1974
1975 /* We have to resolve the user names out-of-process, hence
1976 * let's fork here. It's messy, but well, what can we do? */
1977
1978 r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
1979 if (r < 0)
1980 return r;
1981 if (r == 0) {
1982 uid_t uid = UID_INVALID;
1983 gid_t gid = GID_INVALID;
1984
1985 /* Child */
1986
1987 if (!isempty(s->user)) {
1988 const char *user = s->user;
1989
1990 r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
1991 if (r < 0) {
1992 log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
1993 _exit(EXIT_USER);
1994 }
1995 }
1996
1997 if (!isempty(s->group)) {
1998 const char *group = s->group;
1999
2000 r = get_group_creds(&group, &gid, 0);
2001 if (r < 0) {
2002 log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
2003 _exit(EXIT_GROUP);
2004 }
2005 }
2006
2007 LIST_FOREACH(port, p, s->ports) {
2008 const char *path = NULL;
2009
2010 if (p->type == SOCKET_SOCKET)
2011 path = socket_address_get_path(&p->address);
2012 else if (p->type == SOCKET_FIFO)
2013 path = p->path;
2014
2015 if (!path)
2016 continue;
2017
2018 if (chown(path, uid, gid) < 0) {
2019 log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
2020 _exit(EXIT_CHOWN);
2021 }
2022 }
2023
2024 _exit(EXIT_SUCCESS);
2025 }
2026
2027 r = unit_watch_pid(UNIT(s), pid.pid, /* exclusive= */ true);
2028 if (r < 0)
2029 return r;
2030
2031 *ret_pid = TAKE_PIDREF(pid);
2032 return 0;
2033 }
2034
2035 static void socket_enter_dead(Socket *s, SocketResult f) {
2036 assert(s);
2037
2038 if (s->result == SOCKET_SUCCESS)
2039 s->result = f;
2040
2041 if (s->result == SOCKET_SUCCESS)
2042 unit_log_success(UNIT(s));
2043 else
2044 unit_log_failure(UNIT(s), socket_result_to_string(s->result));
2045
2046 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
2047
2048 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
2049
2050 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
2051
2052 unit_destroy_runtime_data(UNIT(s), &s->exec_context);
2053
2054 unit_unref_uid_gid(UNIT(s), true);
2055 }
2056
2057 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
2058
2059 static void socket_enter_stop_post(Socket *s, SocketResult f) {
2060 int r;
2061 assert(s);
2062
2063 if (s->result == SOCKET_SUCCESS)
2064 s->result = f;
2065
2066 socket_unwatch_control_pid(s);
2067 s->control_command_id = SOCKET_EXEC_STOP_POST;
2068 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
2069
2070 if (s->control_command) {
2071 pidref_done(&s->control_pid);
2072
2073 r = socket_spawn(s, s->control_command, &s->control_pid);
2074 if (r < 0) {
2075 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'stop-post' task: %m");
2076 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2077 return;
2078 }
2079
2080 socket_set_state(s, SOCKET_STOP_POST);
2081 } else
2082 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
2083 }
2084
2085 static int state_to_kill_operation(Socket *s, SocketState state) {
2086 if (state == SOCKET_STOP_PRE_SIGTERM && unit_has_job_type(UNIT(s), JOB_RESTART))
2087 return KILL_RESTART;
2088
2089 if (state == SOCKET_FINAL_SIGTERM)
2090 return KILL_TERMINATE;
2091
2092 return KILL_KILL;
2093 }
2094
2095 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
2096 int r;
2097
2098 assert(s);
2099
2100 if (s->result == SOCKET_SUCCESS)
2101 s->result = f;
2102
2103 r = unit_kill_context(
2104 UNIT(s),
2105 &s->kill_context,
2106 state_to_kill_operation(s, state),
2107 /* main_pid= */ NULL,
2108 &s->control_pid,
2109 /* main_pid_alien= */ false);
2110 if (r < 0) {
2111 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
2112 goto fail;
2113 }
2114
2115 if (r > 0) {
2116 r = socket_arm_timer(s, /* relative= */ true, s->timeout_usec);
2117 if (r < 0) {
2118 log_unit_warning_errno(UNIT(s), r, "Failed to install timer: %m");
2119 goto fail;
2120 }
2121
2122 socket_set_state(s, state);
2123 } else if (state == SOCKET_STOP_PRE_SIGTERM)
2124 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
2125 else if (state == SOCKET_STOP_PRE_SIGKILL)
2126 socket_enter_stop_post(s, SOCKET_SUCCESS);
2127 else if (state == SOCKET_FINAL_SIGTERM)
2128 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2129 else
2130 socket_enter_dead(s, SOCKET_SUCCESS);
2131
2132 return;
2133
2134 fail:
2135 if (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL))
2136 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2137 else
2138 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2139 }
2140
2141 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
2142 int r;
2143 assert(s);
2144
2145 if (s->result == SOCKET_SUCCESS)
2146 s->result = f;
2147
2148 socket_unwatch_control_pid(s);
2149 s->control_command_id = SOCKET_EXEC_STOP_PRE;
2150 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
2151
2152 if (s->control_command) {
2153 pidref_done(&s->control_pid);
2154
2155 r = socket_spawn(s, s->control_command, &s->control_pid);
2156 if (r < 0) {
2157 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'stop-pre' task: %m");
2158 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
2159 return;
2160 }
2161
2162 socket_set_state(s, SOCKET_STOP_PRE);
2163 } else
2164 socket_enter_stop_post(s, SOCKET_SUCCESS);
2165 }
2166
2167 static void socket_enter_listening(Socket *s) {
2168 int r;
2169 assert(s);
2170
2171 if (!s->accept && s->flush_pending) {
2172 log_unit_debug(UNIT(s), "Flushing socket before listening.");
2173 flush_ports(s);
2174 }
2175
2176 r = socket_watch_fds(s);
2177 if (r < 0) {
2178 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
2179 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2180 return;
2181 }
2182
2183 socket_set_state(s, SOCKET_LISTENING);
2184 }
2185
2186 static void socket_enter_start_post(Socket *s) {
2187 int r;
2188 assert(s);
2189
2190 socket_unwatch_control_pid(s);
2191 s->control_command_id = SOCKET_EXEC_START_POST;
2192 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
2193
2194 if (s->control_command) {
2195 pidref_done(&s->control_pid);
2196
2197 r = socket_spawn(s, s->control_command, &s->control_pid);
2198 if (r < 0) {
2199 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'start-post' task: %m");
2200 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2201 return;
2202 }
2203
2204 socket_set_state(s, SOCKET_START_POST);
2205 } else
2206 socket_enter_listening(s);
2207 }
2208
2209 static void socket_enter_start_chown(Socket *s) {
2210 int r;
2211
2212 assert(s);
2213
2214 r = socket_open_fds(s);
2215 if (r < 0) {
2216 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
2217 goto fail;
2218 }
2219
2220 if (!isempty(s->user) || !isempty(s->group)) {
2221
2222 socket_unwatch_control_pid(s);
2223 s->control_command_id = SOCKET_EXEC_START_CHOWN;
2224 s->control_command = NULL;
2225
2226 r = socket_chown(s, &s->control_pid);
2227 if (r < 0) {
2228 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'start-chown' task: %m");
2229 goto fail;
2230 }
2231
2232 socket_set_state(s, SOCKET_START_CHOWN);
2233 } else
2234 socket_enter_start_post(s);
2235
2236 return;
2237
2238 fail:
2239 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2240 }
2241
2242 static void socket_enter_start_pre(Socket *s) {
2243 int r;
2244 assert(s);
2245
2246 socket_unwatch_control_pid(s);
2247
2248 unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
2249
2250 s->control_command_id = SOCKET_EXEC_START_PRE;
2251 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
2252
2253 if (s->control_command) {
2254 pidref_done(&s->control_pid);
2255
2256 r = socket_spawn(s, s->control_command, &s->control_pid);
2257 if (r < 0) {
2258 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'start-pre' task: %m");
2259 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2260 return;
2261 }
2262
2263 socket_set_state(s, SOCKET_START_PRE);
2264 } else
2265 socket_enter_start_chown(s);
2266 }
2267
2268 static void flush_ports(Socket *s) {
2269 assert(s);
2270
2271 /* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
2272 * anymore */
2273
2274 LIST_FOREACH(port, p, s->ports) {
2275 if (p->fd < 0)
2276 continue;
2277
2278 (void) flush_accept(p->fd);
2279 (void) flush_fd(p->fd);
2280 }
2281 }
2282
2283 static void socket_enter_running(Socket *s, int cfd_in) {
2284 /* Note that this call takes possession of the connection fd passed. It either has to assign it
2285 * somewhere or close it. */
2286 _cleanup_close_ int cfd = cfd_in;
2287
2288 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2289 int r;
2290
2291 assert(s);
2292
2293 /* We don't take connections anymore if we are supposed to shut down anyway */
2294 if (unit_stop_pending(UNIT(s))) {
2295
2296 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
2297
2298 if (cfd >= 0)
2299 goto refuse;
2300
2301 flush_ports(s);
2302 return;
2303 }
2304
2305 if (!ratelimit_below(&s->trigger_limit)) {
2306 log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
2307 socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
2308 goto refuse;
2309 }
2310
2311 if (cfd < 0) { /* Accept=no case */
2312 bool pending = false;
2313 Unit *other;
2314
2315 /* If there's already a start pending don't bother to do anything */
2316 UNIT_FOREACH_DEPENDENCY(other, UNIT(s), UNIT_ATOM_TRIGGERS)
2317 if (unit_active_or_pending(other)) {
2318 pending = true;
2319 break;
2320 }
2321
2322 if (!pending) {
2323 if (!UNIT_ISSET(s->service)) {
2324 r = log_unit_warning_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
2325 "Service to activate vanished, refusing activation.");
2326 goto fail;
2327 }
2328
2329 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, NULL, &error, NULL);
2330 if (r < 0)
2331 goto queue_error;
2332 }
2333
2334 socket_set_state(s, SOCKET_RUNNING);
2335 } else { /* Accept=yes case */
2336 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
2337 Unit *service;
2338
2339 if (s->n_connections >= s->max_connections) {
2340 log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
2341 s->n_connections);
2342 goto refuse;
2343 }
2344
2345 if (s->max_connections_per_source > 0) {
2346 r = socket_acquire_peer(s, cfd, &p);
2347 if (r < 0) {
2348 if (ERRNO_IS_DISCONNECT(r))
2349 return;
2350 /* We didn't have enough resources to acquire peer information, let's fail. */
2351 goto fail;
2352 }
2353 if (r > 0 && p->n_ref > s->max_connections_per_source) {
2354 _cleanup_free_ char *t = NULL;
2355
2356 (void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
2357
2358 log_unit_warning(UNIT(s),
2359 "Too many incoming connections (%u) from source %s, dropping connection.",
2360 p->n_ref, strnull(t));
2361 goto refuse;
2362 }
2363 }
2364
2365 r = socket_load_service_unit(s, cfd, &service);
2366 if (r < 0) {
2367 if (ERRNO_IS_DISCONNECT(r))
2368 return;
2369
2370 log_unit_warning_errno(UNIT(s), r, "Failed to load connection service unit: %m");
2371 goto fail;
2372 }
2373
2374 r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
2375 false, UNIT_DEPENDENCY_IMPLICIT);
2376 if (r < 0) {
2377 log_unit_warning_errno(UNIT(s), r, "Failed to add Before=/Triggers= dependencies on connection unit: %m");
2378 goto fail;
2379 }
2380
2381 s->n_accepted++;
2382
2383 r = service_set_socket_fd(SERVICE(service), cfd, s, p, s->selinux_context_from_net);
2384 if (r < 0) {
2385 if (ERRNO_IS_DISCONNECT(r))
2386 return;
2387
2388 log_unit_warning_errno(UNIT(s), r, "Failed to set socket on service: %m");
2389 goto fail;
2390 }
2391
2392 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
2393 s->n_connections++;
2394
2395 r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
2396 if (r < 0) {
2397 /* We failed to activate the new service, but it still exists. Let's make sure the
2398 * service closes and forgets the connection fd again, immediately. */
2399 service_release_socket_fd(SERVICE(service));
2400 goto queue_error;
2401 }
2402
2403 /* Notify clients about changed counters */
2404 unit_add_to_dbus_queue(UNIT(s));
2405 }
2406
2407 return;
2408
2409 refuse:
2410 s->n_refused++;
2411 return;
2412
2413 queue_error:
2414 if (ERRNO_IS_RESOURCE(r))
2415 log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
2416 bus_error_message(&error, r));
2417 else
2418 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
2419 cfd >= 0 ? "template" : "non-template",
2420 bus_error_message(&error, r));
2421
2422 fail:
2423 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2424 }
2425
2426 static void socket_run_next(Socket *s) {
2427 int r;
2428
2429 assert(s);
2430 assert(s->control_command);
2431 assert(s->control_command->command_next);
2432
2433 socket_unwatch_control_pid(s);
2434
2435 s->control_command = s->control_command->command_next;
2436
2437 pidref_done(&s->control_pid);
2438
2439 r = socket_spawn(s, s->control_command, &s->control_pid);
2440 if (r < 0) {
2441 log_unit_warning_errno(UNIT(s), r, "Failed to spawn next task: %m");
2442
2443 if (s->state == SOCKET_START_POST)
2444 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
2445 else if (s->state == SOCKET_STOP_POST)
2446 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
2447 else
2448 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
2449 }
2450 }
2451
2452 static int socket_start(Unit *u) {
2453 Socket *s = SOCKET(u);
2454 int r;
2455
2456 assert(s);
2457
2458 /* We cannot fulfill this request right now, try again later
2459 * please! */
2460 if (IN_SET(s->state,
2461 SOCKET_STOP_PRE,
2462 SOCKET_STOP_PRE_SIGKILL,
2463 SOCKET_STOP_PRE_SIGTERM,
2464 SOCKET_STOP_POST,
2465 SOCKET_FINAL_SIGTERM,
2466 SOCKET_FINAL_SIGKILL,
2467 SOCKET_CLEANING))
2468 return -EAGAIN;
2469
2470 /* Already on it! */
2471 if (IN_SET(s->state,
2472 SOCKET_START_PRE,
2473 SOCKET_START_CHOWN,
2474 SOCKET_START_POST))
2475 return 0;
2476
2477 /* Cannot run this without the service being around */
2478 if (UNIT_ISSET(s->service)) {
2479 Service *service;
2480
2481 service = SERVICE(UNIT_DEREF(s->service));
2482
2483 if (UNIT(service)->load_state != UNIT_LOADED)
2484 return log_unit_error_errno(u, SYNTHETIC_ERRNO(ENOENT),
2485 "Socket service %s not loaded, refusing.", UNIT(service)->id);
2486
2487 /* If the service is already active we cannot start the
2488 * socket */
2489 if (!IN_SET(service->state,
2490 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
2491 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
2492 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY),
2493 "Socket service %s already active, refusing.", UNIT(service)->id);
2494 }
2495
2496 assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
2497
2498 r = unit_acquire_invocation_id(u);
2499 if (r < 0)
2500 return r;
2501
2502 s->result = SOCKET_SUCCESS;
2503 exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
2504
2505 u->reset_accounting = true;
2506
2507 socket_enter_start_pre(s);
2508 return 1;
2509 }
2510
2511 static int socket_stop(Unit *u) {
2512 Socket *s = SOCKET(u);
2513
2514 assert(s);
2515
2516 /* Already on it */
2517 if (IN_SET(s->state,
2518 SOCKET_STOP_PRE,
2519 SOCKET_STOP_PRE_SIGTERM,
2520 SOCKET_STOP_PRE_SIGKILL,
2521 SOCKET_STOP_POST,
2522 SOCKET_FINAL_SIGTERM,
2523 SOCKET_FINAL_SIGKILL))
2524 return 0;
2525
2526 /* If there's already something running we go directly into
2527 * kill mode. */
2528 if (IN_SET(s->state,
2529 SOCKET_START_PRE,
2530 SOCKET_START_CHOWN,
2531 SOCKET_START_POST)) {
2532 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
2533 return -EAGAIN;
2534 }
2535
2536 /* If we are currently cleaning, then abort it, brutally. */
2537 if (s->state == SOCKET_CLEANING) {
2538 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
2539 return 0;
2540 }
2541
2542 assert(IN_SET(s->state, SOCKET_LISTENING, SOCKET_RUNNING));
2543
2544 socket_enter_stop_pre(s, SOCKET_SUCCESS);
2545 return 1;
2546 }
2547
2548 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
2549 Socket *s = SOCKET(u);
2550 int r;
2551
2552 assert(u);
2553 assert(f);
2554 assert(fds);
2555
2556 (void) serialize_item(f, "state", socket_state_to_string(s->state));
2557 (void) serialize_item(f, "result", socket_result_to_string(s->result));
2558 (void) serialize_item_format(f, "n-accepted", "%u", s->n_accepted);
2559 (void) serialize_item_format(f, "n-refused", "%u", s->n_refused);
2560
2561 if (pidref_is_set(&s->control_pid))
2562 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid.pid);
2563
2564 if (s->control_command_id >= 0)
2565 (void) serialize_item(f, "control-command", socket_exec_command_to_string(s->control_command_id));
2566
2567 LIST_FOREACH(port, p, s->ports) {
2568 int copy;
2569
2570 if (p->fd < 0)
2571 continue;
2572
2573 copy = fdset_put_dup(fds, p->fd);
2574 if (copy < 0)
2575 return log_unit_warning_errno(u, copy, "Failed to serialize socket fd: %m");
2576
2577 if (p->type == SOCKET_SOCKET) {
2578 _cleanup_free_ char *t = NULL;
2579
2580 r = socket_address_print(&p->address, &t);
2581 if (r < 0)
2582 return log_unit_error_errno(u, r, "Failed to format socket address: %m");
2583
2584 if (socket_address_family(&p->address) == AF_NETLINK)
2585 (void) serialize_item_format(f, "netlink", "%i %s", copy, t);
2586 else
2587 (void) serialize_item_format(f, "socket", "%i %i %s", copy, p->address.type, t);
2588 } else if (p->type == SOCKET_SPECIAL)
2589 (void) serialize_item_format(f, "special", "%i %s", copy, p->path);
2590 else if (p->type == SOCKET_MQUEUE)
2591 (void) serialize_item_format(f, "mqueue", "%i %s", copy, p->path);
2592 else if (p->type == SOCKET_USB_FUNCTION)
2593 (void) serialize_item_format(f, "ffs", "%i %s", copy, p->path);
2594 else {
2595 assert(p->type == SOCKET_FIFO);
2596 (void) serialize_item_format(f, "fifo", "%i %s", copy, p->path);
2597 }
2598 }
2599
2600 return 0;
2601 }
2602
2603 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2604 Socket *s = SOCKET(u);
2605 int r;
2606
2607 assert(u);
2608 assert(key);
2609 assert(value);
2610
2611 if (streq(key, "state")) {
2612 SocketState state;
2613
2614 state = socket_state_from_string(value);
2615 if (state < 0)
2616 log_unit_debug(u, "Failed to parse state value: %s", value);
2617 else
2618 s->deserialized_state = state;
2619 } else if (streq(key, "result")) {
2620 SocketResult f;
2621
2622 f = socket_result_from_string(value);
2623 if (f < 0)
2624 log_unit_debug(u, "Failed to parse result value: %s", value);
2625 else if (f != SOCKET_SUCCESS)
2626 s->result = f;
2627
2628 } else if (streq(key, "n-accepted")) {
2629 unsigned k;
2630
2631 if (safe_atou(value, &k) < 0)
2632 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2633 else
2634 s->n_accepted += k;
2635 } else if (streq(key, "n-refused")) {
2636 unsigned k;
2637
2638 if (safe_atou(value, &k) < 0)
2639 log_unit_debug(u, "Failed to parse n-refused value: %s", value);
2640 else
2641 s->n_refused += k;
2642 } else if (streq(key, "control-pid")) {
2643 pidref_done(&s->control_pid);
2644 r = pidref_set_pidstr(&s->control_pid, value);
2645 if (r < 0)
2646 log_debug_errno(r, "Failed to pin control PID '%s', ignoring: %m", value);
2647 } else if (streq(key, "control-command")) {
2648 SocketExecCommand id;
2649
2650 id = socket_exec_command_from_string(value);
2651 if (id < 0)
2652 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2653 else {
2654 s->control_command_id = id;
2655 s->control_command = s->exec_command[id];
2656 }
2657 } else if (streq(key, "fifo")) {
2658 _cleanup_free_ char *fdv = NULL;
2659 bool found = false;
2660 int fd;
2661
2662 r = extract_first_word(&value, &fdv, NULL, 0);
2663 if (r <= 0) {
2664 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2665 return 0;
2666 }
2667
2668 fd = parse_fd(fdv);
2669 if (fd < 0 || !fdset_contains(fds, fd)) {
2670 log_unit_debug(u, "Invalid fifo value: %s", fdv);
2671 return 0;
2672 }
2673
2674 LIST_FOREACH(port, p, s->ports)
2675 if (p->fd < 0 &&
2676 p->type == SOCKET_FIFO &&
2677 path_equal_or_inode_same(p->path, value, 0)) {
2678 p->fd = fdset_remove(fds, fd);
2679 found = true;
2680 break;
2681 }
2682 if (!found)
2683 log_unit_debug(u, "No matching fifo socket found: %s", value);
2684
2685 } else if (streq(key, "special")) {
2686 _cleanup_free_ char *fdv = NULL;
2687 bool found = false;
2688 int fd;
2689
2690 r = extract_first_word(&value, &fdv, NULL, 0);
2691 if (r <= 0) {
2692 log_unit_debug(u, "Failed to parse special value: %s", value);
2693 return 0;
2694 }
2695
2696 fd = parse_fd(fdv);
2697 if (fd < 0 || !fdset_contains(fds, fd)) {
2698 log_unit_debug(u, "Invalid special value: %s", fdv);
2699 return 0;
2700 }
2701
2702 LIST_FOREACH(port, p, s->ports)
2703 if (p->fd < 0 &&
2704 p->type == SOCKET_SPECIAL &&
2705 path_equal_or_inode_same(p->path, value, 0)) {
2706 p->fd = fdset_remove(fds, fd);
2707 found = true;
2708 break;
2709 }
2710 if (!found)
2711 log_unit_debug(u, "No matching special socket found: %s", value);
2712
2713 } else if (streq(key, "mqueue")) {
2714 _cleanup_free_ char *fdv = NULL;
2715 bool found = false;
2716 int fd;
2717
2718 r = extract_first_word(&value, &fdv, NULL, 0);
2719 if (r <= 0) {
2720 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2721 return 0;
2722 }
2723
2724 fd = parse_fd(fdv);
2725 if (fd < 0 || !fdset_contains(fds, fd)) {
2726 log_unit_debug(u, "Invalid mqueue value: %s", fdv);
2727 return 0;
2728 }
2729
2730 LIST_FOREACH(port, p, s->ports)
2731 if (p->fd < 0 &&
2732 p->type == SOCKET_MQUEUE &&
2733 streq(p->path, value)) {
2734 p->fd = fdset_remove(fds, fd);
2735 found = true;
2736 break;
2737 }
2738 if (!found)
2739 log_unit_debug(u, "No matching mqueue socket found: %s", value);
2740
2741 } else if (streq(key, "socket")) {
2742 _cleanup_free_ char *fdv = NULL, *typev = NULL;
2743 bool found = false;
2744 int fd, type;
2745
2746 r = extract_first_word(&value, &fdv, NULL, 0);
2747 if (r <= 0) {
2748 log_unit_debug(u, "Failed to parse socket fd from value: %s", value);
2749 return 0;
2750 }
2751
2752 fd = parse_fd(fdv);
2753 if (fd < 0 || !fdset_contains(fds, fd)) {
2754 log_unit_debug(u, "Invalid socket fd: %s", fdv);
2755 return 0;
2756 }
2757
2758 r = extract_first_word(&value, &typev, NULL, 0);
2759 if (r <= 0) {
2760 log_unit_debug(u, "Failed to parse socket type from value: %s", value);
2761 return 0;
2762 }
2763
2764 if (safe_atoi(typev, &type) < 0 || type < 0) {
2765 log_unit_debug(u, "Invalid socket type: %s", typev);
2766 return 0;
2767 }
2768
2769 LIST_FOREACH(port, p, s->ports)
2770 if (p->fd < 0 &&
2771 socket_address_is(&p->address, value, type)) {
2772 p->fd = fdset_remove(fds, fd);
2773 found = true;
2774 break;
2775 }
2776 if (!found)
2777 log_unit_debug(u, "No matching %s socket found: %s",
2778 socket_address_type_to_string(type), value);
2779
2780 } else if (streq(key, "netlink")) {
2781 _cleanup_free_ char *fdv = NULL;
2782 bool found = false;
2783 int fd;
2784
2785 r = extract_first_word(&value, &fdv, NULL, 0);
2786 if (r <= 0) {
2787 log_unit_debug(u, "Failed to parse socket value: %s", value);
2788 return 0;
2789 }
2790
2791 fd = parse_fd(fdv);
2792 if (fd < 0 || !fdset_contains(fds, fd)) {
2793 log_unit_debug(u, "Invalid socket value: %s", fdv);
2794 return 0;
2795 }
2796
2797 LIST_FOREACH(port, p, s->ports)
2798 if (p->fd < 0 &&
2799 socket_address_is_netlink(&p->address, value)) {
2800 p->fd = fdset_remove(fds, fd);
2801 found = true;
2802 break;
2803 }
2804 if (!found)
2805 log_unit_debug(u, "No matching netlink socket found: %s", value);
2806
2807 } else if (streq(key, "ffs")) {
2808 _cleanup_free_ char *fdv = NULL;
2809 bool found = false;
2810 int fd;
2811
2812 r = extract_first_word(&value, &fdv, NULL, 0);
2813 if (r <= 0) {
2814 log_unit_debug(u, "Failed to parse ffs value: %s", value);
2815 return 0;
2816 }
2817
2818 fd = parse_fd(fdv);
2819 if (fd < 0 || !fdset_contains(fds, fd)) {
2820 log_unit_debug(u, "Invalid ffs value: %s", fdv);
2821 return 0;
2822 }
2823
2824 LIST_FOREACH(port, p, s->ports)
2825 if (p->fd < 0 &&
2826 p->type == SOCKET_USB_FUNCTION &&
2827 path_equal_or_inode_same(p->path, value, 0)) {
2828 p->fd = fdset_remove(fds, fd);
2829 found = true;
2830 break;
2831 }
2832 if (!found)
2833 log_unit_debug(u, "No matching ffs socket found: %s", value);
2834
2835 } else
2836 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2837
2838 return 0;
2839 }
2840
2841 static void socket_distribute_fds(Unit *u, FDSet *fds) {
2842 Socket *s = SOCKET(u);
2843
2844 assert(u);
2845
2846 LIST_FOREACH(port, p, s->ports) {
2847 int fd;
2848
2849 if (p->type != SOCKET_SOCKET)
2850 continue;
2851
2852 if (p->fd >= 0)
2853 continue;
2854
2855 FDSET_FOREACH(fd, fds) {
2856 if (socket_address_matches_fd(&p->address, fd)) {
2857 p->fd = fdset_remove(fds, fd);
2858 s->deserialized_state = SOCKET_LISTENING;
2859 break;
2860 }
2861 }
2862 }
2863 }
2864
2865 static UnitActiveState socket_active_state(Unit *u) {
2866 assert(u);
2867
2868 return state_translation_table[SOCKET(u)->state];
2869 }
2870
2871 static const char *socket_sub_state_to_string(Unit *u) {
2872 assert(u);
2873
2874 return socket_state_to_string(SOCKET(u)->state);
2875 }
2876
2877 const char* socket_port_type_to_string(SocketPort *p) {
2878
2879 assert(p);
2880
2881 switch (p->type) {
2882
2883 case SOCKET_SOCKET:
2884
2885 switch (p->address.type) {
2886
2887 case SOCK_STREAM:
2888 return "Stream";
2889
2890 case SOCK_DGRAM:
2891 return "Datagram";
2892
2893 case SOCK_SEQPACKET:
2894 return "SequentialPacket";
2895
2896 case SOCK_RAW:
2897 if (socket_address_family(&p->address) == AF_NETLINK)
2898 return "Netlink";
2899
2900 _fallthrough_;
2901 default:
2902 return NULL;
2903 }
2904
2905 case SOCKET_SPECIAL:
2906 return "Special";
2907
2908 case SOCKET_MQUEUE:
2909 return "MessageQueue";
2910
2911 case SOCKET_FIFO:
2912 return "FIFO";
2913
2914 case SOCKET_USB_FUNCTION:
2915 return "USBFunction";
2916
2917 default:
2918 return NULL;
2919 }
2920 }
2921
2922 SocketType socket_port_type_from_string(const char *s) {
2923 assert(s);
2924
2925 if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
2926 return SOCKET_SOCKET;
2927 else if (streq(s, "Special"))
2928 return SOCKET_SPECIAL;
2929 else if (streq(s, "MessageQueue"))
2930 return SOCKET_MQUEUE;
2931 else if (streq(s, "FIFO"))
2932 return SOCKET_FIFO;
2933 else if (streq(s, "USBFunction"))
2934 return SOCKET_USB_FUNCTION;
2935 else
2936 return _SOCKET_TYPE_INVALID;
2937 }
2938
2939 static bool socket_may_gc(Unit *u) {
2940 Socket *s = SOCKET(u);
2941
2942 assert(u);
2943
2944 return s->n_connections == 0;
2945 }
2946
2947 static int socket_accept_do(Socket *s, int fd) {
2948 int cfd;
2949
2950 assert(s);
2951 assert(fd >= 0);
2952
2953 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2954 if (cfd < 0)
2955 /* Convert transient network errors into clean and well-defined EAGAIN */
2956 return ERRNO_IS_ACCEPT_AGAIN(errno) ? -EAGAIN : -errno;
2957
2958 return cfd;
2959 }
2960
2961 static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
2962 _cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
2963 _cleanup_close_pair_ int pair[2] = PIPE_EBADF;
2964 int cfd, r;
2965
2966 assert(s);
2967 assert(p);
2968 assert(fd >= 0);
2969
2970 /* Similar to socket_address_listen_in_cgroup(), but for accept() rather than socket(): make sure that any
2971 * connection socket is also properly associated with the cgroup. */
2972
2973 if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
2974 goto shortcut;
2975
2976 r = bpf_firewall_supported();
2977 if (r < 0)
2978 return r;
2979 if (r == BPF_FIREWALL_UNSUPPORTED)
2980 goto shortcut;
2981
2982 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
2983 return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
2984
2985 r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
2986 if (r < 0)
2987 return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
2988 if (r == 0) {
2989 /* Child */
2990
2991 pair[0] = safe_close(pair[0]);
2992
2993 cfd = socket_accept_do(s, fd);
2994 if (cfd == -EAGAIN) /* spurious accept() */
2995 _exit(EXIT_SUCCESS);
2996 if (cfd < 0) {
2997 log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
2998 _exit(EXIT_FAILURE);
2999 }
3000
3001 r = send_one_fd(pair[1], cfd, 0);
3002 if (r < 0) {
3003 log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
3004 _exit(EXIT_FAILURE);
3005 }
3006
3007 _exit(EXIT_SUCCESS);
3008 }
3009
3010 pair[1] = safe_close(pair[1]);
3011 cfd = receive_one_fd(pair[0], 0);
3012
3013 /* We synchronously wait for the helper, as it shouldn't be slow */
3014 r = wait_for_terminate_and_check("(sd-accept)", pid.pid, WAIT_LOG_ABNORMAL);
3015 if (r < 0) {
3016 safe_close(cfd);
3017 return r;
3018 }
3019
3020 /* If we received no fd, we got EIO here. If this happens with a process exit code of EXIT_SUCCESS
3021 * this is a spurious accept(), let's convert that back to EAGAIN here. */
3022 if (cfd == -EIO)
3023 return -EAGAIN;
3024 if (cfd < 0)
3025 return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
3026
3027 return cfd;
3028
3029 shortcut:
3030 cfd = socket_accept_do(s, fd);
3031 if (cfd == -EAGAIN) /* spurious accept(), skip it silently */
3032 return -EAGAIN;
3033 if (cfd < 0)
3034 return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
3035
3036 return cfd;
3037 }
3038
3039 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3040 SocketPort *p = ASSERT_PTR(userdata);
3041 int cfd = -EBADF;
3042
3043 assert(fd >= 0);
3044
3045 if (p->socket->state != SOCKET_LISTENING)
3046 return 0;
3047
3048 log_unit_debug(UNIT(p->socket), "Incoming traffic");
3049
3050 if (revents != EPOLLIN) {
3051 if (revents & EPOLLHUP)
3052 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.");
3053 else
3054 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
3055 goto fail;
3056 }
3057
3058 if (p->socket->accept &&
3059 p->type == SOCKET_SOCKET &&
3060 socket_address_can_accept(&p->address)) {
3061
3062 cfd = socket_accept_in_cgroup(p->socket, p, fd);
3063 if (cfd == -EAGAIN) /* Spurious accept() */
3064 return 0;
3065 if (cfd < 0)
3066 goto fail;
3067
3068 socket_apply_socket_options(p->socket, p, cfd);
3069 }
3070
3071 socket_enter_running(p->socket, cfd);
3072 return 0;
3073
3074 fail:
3075 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
3076 return 0;
3077 }
3078
3079 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3080 Socket *s = SOCKET(u);
3081 SocketResult f;
3082
3083 assert(s);
3084 assert(pid >= 0);
3085
3086 if (pid != s->control_pid.pid)
3087 return;
3088
3089 pidref_done(&s->control_pid);
3090
3091 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
3092 f = SOCKET_SUCCESS;
3093 else if (code == CLD_EXITED)
3094 f = SOCKET_FAILURE_EXIT_CODE;
3095 else if (code == CLD_KILLED)
3096 f = SOCKET_FAILURE_SIGNAL;
3097 else if (code == CLD_DUMPED)
3098 f = SOCKET_FAILURE_CORE_DUMP;
3099 else
3100 assert_not_reached();
3101
3102 if (s->control_command) {
3103 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3104
3105 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3106 f = SOCKET_SUCCESS;
3107 }
3108
3109 unit_log_process_exit(
3110 u,
3111 "Control process",
3112 socket_exec_command_to_string(s->control_command_id),
3113 f == SOCKET_SUCCESS,
3114 code, status);
3115
3116 if (s->result == SOCKET_SUCCESS)
3117 s->result = f;
3118
3119 if (s->control_command &&
3120 s->control_command->command_next &&
3121 f == SOCKET_SUCCESS) {
3122
3123 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
3124 socket_run_next(s);
3125 } else {
3126 s->control_command = NULL;
3127 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3128
3129 /* No further commands for this step, so let's figure
3130 * out what to do next */
3131
3132 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
3133
3134 switch (s->state) {
3135
3136 case SOCKET_START_PRE:
3137 if (f == SOCKET_SUCCESS)
3138 socket_enter_start_chown(s);
3139 else
3140 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
3141 break;
3142
3143 case SOCKET_START_CHOWN:
3144 if (f == SOCKET_SUCCESS)
3145 socket_enter_start_post(s);
3146 else
3147 socket_enter_stop_pre(s, f);
3148 break;
3149
3150 case SOCKET_START_POST:
3151 if (f == SOCKET_SUCCESS)
3152 socket_enter_listening(s);
3153 else
3154 socket_enter_stop_pre(s, f);
3155 break;
3156
3157 case SOCKET_STOP_PRE:
3158 case SOCKET_STOP_PRE_SIGTERM:
3159 case SOCKET_STOP_PRE_SIGKILL:
3160 socket_enter_stop_post(s, f);
3161 break;
3162
3163 case SOCKET_STOP_POST:
3164 case SOCKET_FINAL_SIGTERM:
3165 case SOCKET_FINAL_SIGKILL:
3166 socket_enter_dead(s, f);
3167 break;
3168
3169 case SOCKET_CLEANING:
3170
3171 if (s->clean_result == SOCKET_SUCCESS)
3172 s->clean_result = f;
3173
3174 socket_enter_dead(s, SOCKET_SUCCESS);
3175 break;
3176
3177 default:
3178 assert_not_reached();
3179 }
3180 }
3181
3182 /* Notify clients about changed exit status */
3183 unit_add_to_dbus_queue(u);
3184 }
3185
3186 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3187 Socket *s = SOCKET(userdata);
3188
3189 assert(s);
3190 assert(s->timer_event_source == source);
3191
3192 switch (s->state) {
3193
3194 case SOCKET_START_PRE:
3195 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
3196 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3197 break;
3198
3199 case SOCKET_START_CHOWN:
3200 case SOCKET_START_POST:
3201 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
3202 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
3203 break;
3204
3205 case SOCKET_STOP_PRE:
3206 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3207 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3208 break;
3209
3210 case SOCKET_STOP_PRE_SIGTERM:
3211 if (s->kill_context.send_sigkill) {
3212 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
3213 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3214 } else {
3215 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
3216 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3217 }
3218 break;
3219
3220 case SOCKET_STOP_PRE_SIGKILL:
3221 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3222 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
3223 break;
3224
3225 case SOCKET_STOP_POST:
3226 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
3227 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
3228 break;
3229
3230 case SOCKET_FINAL_SIGTERM:
3231 if (s->kill_context.send_sigkill) {
3232 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
3233 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
3234 } else {
3235 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
3236 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3237 }
3238 break;
3239
3240 case SOCKET_FINAL_SIGKILL:
3241 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
3242 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
3243 break;
3244
3245 case SOCKET_CLEANING:
3246 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
3247
3248 if (s->clean_result == SOCKET_SUCCESS)
3249 s->clean_result = SOCKET_FAILURE_TIMEOUT;
3250
3251 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, 0);
3252 break;
3253
3254 default:
3255 assert_not_reached();
3256 }
3257
3258 return 0;
3259 }
3260
3261 int socket_collect_fds(Socket *s, int **fds) {
3262 size_t k = 0, n = 0;
3263 int *rfds;
3264
3265 assert(s);
3266 assert(fds);
3267
3268 /* Called from the service code for requesting our fds */
3269
3270 LIST_FOREACH(port, p, s->ports) {
3271 if (p->fd >= 0)
3272 n++;
3273 n += p->n_auxiliary_fds;
3274 }
3275
3276 if (n <= 0) {
3277 *fds = NULL;
3278 return 0;
3279 }
3280
3281 rfds = new(int, n);
3282 if (!rfds)
3283 return -ENOMEM;
3284
3285 LIST_FOREACH(port, p, s->ports) {
3286 if (p->fd >= 0)
3287 rfds[k++] = p->fd;
3288 for (size_t i = 0; i < p->n_auxiliary_fds; ++i)
3289 rfds[k++] = p->auxiliary_fds[i];
3290 }
3291
3292 assert(k == n);
3293
3294 *fds = rfds;
3295 return (int) n;
3296 }
3297
3298 static void socket_reset_failed(Unit *u) {
3299 Socket *s = SOCKET(u);
3300
3301 assert(s);
3302
3303 if (s->state == SOCKET_FAILED)
3304 socket_set_state(s, SOCKET_DEAD);
3305
3306 s->result = SOCKET_SUCCESS;
3307 s->clean_result = SOCKET_SUCCESS;
3308 }
3309
3310 void socket_connection_unref(Socket *s) {
3311 assert(s);
3312
3313 /* The service is dead. Yay!
3314 *
3315 * This is strictly for one-instance-per-connection
3316 * services. */
3317
3318 assert(s->n_connections > 0);
3319 s->n_connections--;
3320
3321 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
3322 }
3323
3324 static void socket_trigger_notify(Unit *u, Unit *other) {
3325 Socket *s = SOCKET(u);
3326
3327 assert(u);
3328 assert(other);
3329
3330 /* Filter out invocations with bogus state */
3331 assert(UNIT_IS_LOAD_COMPLETE(other->load_state));
3332 assert(other->type == UNIT_SERVICE);
3333
3334 /* Don't propagate state changes from the service if we are already down */
3335 if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
3336 return;
3337
3338 /* We don't care for the service state if we are in Accept=yes mode */
3339 if (s->accept)
3340 return;
3341
3342 /* Propagate start limit hit state */
3343 if (other->start_limit_hit) {
3344 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
3345 return;
3346 }
3347
3348 /* Don't propagate anything if there's still a job queued */
3349 if (other->job)
3350 return;
3351
3352 if (IN_SET(SERVICE(other)->state,
3353 SERVICE_DEAD, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED, SERVICE_FAILED_BEFORE_AUTO_RESTART,
3354 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
3355 SERVICE_AUTO_RESTART, SERVICE_AUTO_RESTART_QUEUED))
3356 socket_enter_listening(s);
3357
3358 if (SERVICE(other)->state == SERVICE_RUNNING)
3359 socket_set_state(s, SOCKET_RUNNING);
3360 }
3361
3362 static int socket_get_timeout(Unit *u, usec_t *timeout) {
3363 Socket *s = SOCKET(u);
3364 usec_t t;
3365 int r;
3366
3367 if (!s->timer_event_source)
3368 return 0;
3369
3370 r = sd_event_source_get_time(s->timer_event_source, &t);
3371 if (r < 0)
3372 return r;
3373 if (t == USEC_INFINITY)
3374 return 0;
3375
3376 *timeout = t;
3377 return 1;
3378 }
3379
3380 char *socket_fdname(Socket *s) {
3381 assert(s);
3382
3383 /* Returns the name to use for $LISTEN_NAMES. If the user
3384 * didn't specify anything specifically, use the socket unit's
3385 * name as fallback. */
3386
3387 return s->fdname ?: UNIT(s)->id;
3388 }
3389
3390 static PidRef *socket_control_pid(Unit *u) {
3391 return &ASSERT_PTR(SOCKET(u))->control_pid;
3392 }
3393
3394 static int socket_clean(Unit *u, ExecCleanMask mask) {
3395 _cleanup_strv_free_ char **l = NULL;
3396 Socket *s = SOCKET(u);
3397 int r;
3398
3399 assert(s);
3400 assert(mask != 0);
3401
3402 if (s->state != SOCKET_DEAD)
3403 return -EBUSY;
3404
3405 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
3406 if (r < 0)
3407 return r;
3408
3409 if (strv_isempty(l))
3410 return -EUNATCH;
3411
3412 socket_unwatch_control_pid(s);
3413 s->clean_result = SOCKET_SUCCESS;
3414 s->control_command = NULL;
3415 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
3416
3417 r = socket_arm_timer(s, /* relative= */ true, s->exec_context.timeout_clean_usec);
3418 if (r < 0) {
3419 log_unit_warning_errno(u, r, "Failed to install timer: %m");
3420 goto fail;
3421 }
3422
3423 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
3424 if (r < 0) {
3425 log_unit_warning_errno(u, r, "Failed to spawn cleaning task: %m");
3426 goto fail;
3427 }
3428
3429 socket_set_state(s, SOCKET_CLEANING);
3430 return 0;
3431
3432 fail:
3433 s->clean_result = SOCKET_FAILURE_RESOURCES;
3434 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
3435 return r;
3436 }
3437
3438 static int socket_can_clean(Unit *u, ExecCleanMask *ret) {
3439 Socket *s = SOCKET(u);
3440
3441 assert(s);
3442
3443 return exec_context_get_clean_mask(&s->exec_context, ret);
3444 }
3445
3446 static int socket_can_start(Unit *u) {
3447 Socket *s = SOCKET(u);
3448 int r;
3449
3450 assert(s);
3451
3452 r = unit_test_start_limit(u);
3453 if (r < 0) {
3454 socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
3455 return r;
3456 }
3457
3458 return 1;
3459 }
3460
3461 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
3462 [SOCKET_EXEC_START_PRE] = "ExecStartPre",
3463 [SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
3464 [SOCKET_EXEC_START_POST] = "ExecStartPost",
3465 [SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
3466 [SOCKET_EXEC_STOP_POST] = "ExecStopPost"
3467 };
3468
3469 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
3470
3471 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
3472 [SOCKET_SUCCESS] = "success",
3473 [SOCKET_FAILURE_RESOURCES] = "resources",
3474 [SOCKET_FAILURE_TIMEOUT] = "timeout",
3475 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
3476 [SOCKET_FAILURE_SIGNAL] = "signal",
3477 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
3478 [SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
3479 [SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
3480 [SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
3481 };
3482
3483 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
3484
3485 static const char* const socket_timestamping_table[_SOCKET_TIMESTAMPING_MAX] = {
3486 [SOCKET_TIMESTAMPING_OFF] = "off",
3487 [SOCKET_TIMESTAMPING_US] = "us",
3488 [SOCKET_TIMESTAMPING_NS] = "ns",
3489 };
3490
3491 DEFINE_STRING_TABLE_LOOKUP(socket_timestamping, SocketTimestamping);
3492
3493 SocketTimestamping socket_timestamping_from_string_harder(const char *p) {
3494 SocketTimestamping t;
3495 int r;
3496
3497 if (!p)
3498 return _SOCKET_TIMESTAMPING_INVALID;
3499
3500 t = socket_timestamping_from_string(p);
3501 if (t >= 0)
3502 return t;
3503
3504 /* Let's alternatively support the various other aliases parse_time() accepts for ns and µs here,
3505 * too. */
3506 if (streq(p, "nsec"))
3507 return SOCKET_TIMESTAMPING_NS;
3508 if (STR_IN_SET(p, "usec", "µs", "μs")) /* Accept both small greek letter mu + micro sign unicode codepoints */
3509 return SOCKET_TIMESTAMPING_US;
3510
3511 r = parse_boolean(p);
3512 if (r < 0)
3513 return _SOCKET_TIMESTAMPING_INVALID;
3514
3515 return r ? SOCKET_TIMESTAMPING_NS : SOCKET_TIMESTAMPING_OFF; /* If boolean yes, default to ns accuracy */
3516 }
3517
3518 const UnitVTable socket_vtable = {
3519 .object_size = sizeof(Socket),
3520 .exec_context_offset = offsetof(Socket, exec_context),
3521 .cgroup_context_offset = offsetof(Socket, cgroup_context),
3522 .kill_context_offset = offsetof(Socket, kill_context),
3523 .exec_runtime_offset = offsetof(Socket, exec_runtime),
3524
3525 .sections =
3526 "Unit\0"
3527 "Socket\0"
3528 "Install\0",
3529 .private_section = "Socket",
3530
3531 .can_transient = true,
3532 .can_trigger = true,
3533 .can_fail = true,
3534
3535 .init = socket_init,
3536 .done = socket_done,
3537 .load = socket_load,
3538
3539 .coldplug = socket_coldplug,
3540
3541 .dump = socket_dump,
3542
3543 .start = socket_start,
3544 .stop = socket_stop,
3545
3546 .clean = socket_clean,
3547 .can_clean = socket_can_clean,
3548
3549 .get_timeout = socket_get_timeout,
3550
3551 .serialize = socket_serialize,
3552 .deserialize_item = socket_deserialize_item,
3553 .distribute_fds = socket_distribute_fds,
3554
3555 .active_state = socket_active_state,
3556 .sub_state_to_string = socket_sub_state_to_string,
3557
3558 .will_restart = unit_will_restart_default,
3559
3560 .may_gc = socket_may_gc,
3561
3562 .sigchld_event = socket_sigchld_event,
3563
3564 .trigger_notify = socket_trigger_notify,
3565
3566 .reset_failed = socket_reset_failed,
3567
3568 .control_pid = socket_control_pid,
3569
3570 .bus_set_property = bus_socket_set_property,
3571 .bus_commit_properties = bus_socket_commit_properties,
3572
3573 .status_message_formats = {
3574 .finished_start_job = {
3575 [JOB_DONE] = "Listening on %s.",
3576 [JOB_FAILED] = "Failed to listen on %s.",
3577 [JOB_TIMEOUT] = "Timed out starting %s.",
3578 },
3579 .finished_stop_job = {
3580 [JOB_DONE] = "Closed %s.",
3581 [JOB_FAILED] = "Failed stopping %s.",
3582 [JOB_TIMEOUT] = "Timed out stopping %s.",
3583 },
3584 },
3585
3586 .can_start = socket_can_start,
3587 };
Unnamed repository; edit this file 'description' to name the repository.