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Merge pull request #1210 from poettering/import-fixes
[thirdparty/systemd.git] / src / core / socket.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <sys/stat.h>
23 #include <unistd.h>
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <sys/epoll.h>
27 #include <signal.h>
28 #include <arpa/inet.h>
29 #include <netinet/tcp.h>
30 #include <mqueue.h>
31
32 #include "sd-event.h"
33 #include "log.h"
34 #include "strv.h"
35 #include "mkdir.h"
36 #include "path-util.h"
37 #include "unit-name.h"
38 #include "unit-printf.h"
39 #include "missing.h"
40 #include "special.h"
41 #include "label.h"
42 #include "exit-status.h"
43 #include "def.h"
44 #include "smack-util.h"
45 #include "bus-util.h"
46 #include "bus-error.h"
47 #include "selinux-util.h"
48 #include "dbus-socket.h"
49 #include "unit.h"
50 #include "formats-util.h"
51 #include "signal-util.h"
52 #include "socket.h"
53
54 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
55 [SOCKET_DEAD] = UNIT_INACTIVE,
56 [SOCKET_START_PRE] = UNIT_ACTIVATING,
57 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
58 [SOCKET_START_POST] = UNIT_ACTIVATING,
59 [SOCKET_LISTENING] = UNIT_ACTIVE,
60 [SOCKET_RUNNING] = UNIT_ACTIVE,
61 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
62 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
63 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
64 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
65 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
66 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
67 [SOCKET_FAILED] = UNIT_FAILED
68 };
69
70 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
71 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
72
73 static void socket_init(Unit *u) {
74 Socket *s = SOCKET(u);
75
76 assert(u);
77 assert(u->load_state == UNIT_STUB);
78
79 s->backlog = SOMAXCONN;
80 s->timeout_usec = u->manager->default_timeout_start_usec;
81 s->directory_mode = 0755;
82 s->socket_mode = 0666;
83
84 s->max_connections = 64;
85
86 s->priority = -1;
87 s->ip_tos = -1;
88 s->ip_ttl = -1;
89 s->mark = -1;
90
91 s->exec_context.std_output = u->manager->default_std_output;
92 s->exec_context.std_error = u->manager->default_std_error;
93
94 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
95 }
96
97 static void socket_unwatch_control_pid(Socket *s) {
98 assert(s);
99
100 if (s->control_pid <= 0)
101 return;
102
103 unit_unwatch_pid(UNIT(s), s->control_pid);
104 s->control_pid = 0;
105 }
106
107 void socket_free_ports(Socket *s) {
108 SocketPort *p;
109
110 assert(s);
111
112 while ((p = s->ports)) {
113 LIST_REMOVE(port, s->ports, p);
114
115 sd_event_source_unref(p->event_source);
116
117 safe_close(p->fd);
118 free(p->path);
119 free(p);
120 }
121 }
122
123 static void socket_done(Unit *u) {
124 Socket *s = SOCKET(u);
125
126 assert(s);
127
128 socket_free_ports(s);
129
130 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
131 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
132 s->control_command = NULL;
133
134 socket_unwatch_control_pid(s);
135
136 unit_ref_unset(&s->service);
137
138 s->tcp_congestion = mfree(s->tcp_congestion);
139 s->bind_to_device = mfree(s->bind_to_device);
140
141 free(s->smack);
142 free(s->smack_ip_in);
143 free(s->smack_ip_out);
144
145 strv_free(s->symlinks);
146
147 free(s->user);
148 free(s->group);
149
150 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
151 }
152
153 static int socket_arm_timer(Socket *s) {
154 int r;
155
156 assert(s);
157
158 if (s->timeout_usec <= 0) {
159 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
160 return 0;
161 }
162
163 if (s->timer_event_source) {
164 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
165 if (r < 0)
166 return r;
167
168 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
169 }
170
171 r = sd_event_add_time(
172 UNIT(s)->manager->event,
173 &s->timer_event_source,
174 CLOCK_MONOTONIC,
175 now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
176 socket_dispatch_timer, s);
177 if (r < 0)
178 return r;
179
180 (void) sd_event_source_set_description(s->timer_event_source, "socket-timer");
181
182 return 0;
183 }
184
185 int socket_instantiate_service(Socket *s) {
186 _cleanup_free_ char *prefix = NULL, *name = NULL;
187 int r;
188 Unit *u;
189
190 assert(s);
191
192 /* This fills in s->service if it isn't filled in yet. For
193 * Accept=yes sockets we create the next connection service
194 * here. For Accept=no this is mostly a NOP since the service
195 * is figured out at load time anyway. */
196
197 if (UNIT_DEREF(s->service))
198 return 0;
199
200 if (!s->accept)
201 return 0;
202
203 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
204 if (r < 0)
205 return r;
206
207 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
208 return -ENOMEM;
209
210 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
211 if (r < 0)
212 return r;
213
214 u->no_gc = true;
215 unit_ref_set(&s->service, u);
216
217 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
218 }
219
220 static bool have_non_accept_socket(Socket *s) {
221 SocketPort *p;
222
223 assert(s);
224
225 if (!s->accept)
226 return true;
227
228 LIST_FOREACH(port, p, s->ports) {
229
230 if (p->type != SOCKET_SOCKET)
231 return true;
232
233 if (!socket_address_can_accept(&p->address))
234 return true;
235 }
236
237 return false;
238 }
239
240 static int socket_add_mount_links(Socket *s) {
241 SocketPort *p;
242 int r;
243
244 assert(s);
245
246 LIST_FOREACH(port, p, s->ports) {
247 const char *path = NULL;
248
249 if (p->type == SOCKET_SOCKET)
250 path = socket_address_get_path(&p->address);
251 else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL)
252 path = p->path;
253
254 if (!path)
255 continue;
256
257 r = unit_require_mounts_for(UNIT(s), path);
258 if (r < 0)
259 return r;
260 }
261
262 return 0;
263 }
264
265 static int socket_add_device_link(Socket *s) {
266 char *t;
267
268 assert(s);
269
270 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
271 return 0;
272
273 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
274 return unit_add_node_link(UNIT(s), t, false);
275 }
276
277 static int socket_add_default_dependencies(Socket *s) {
278 int r;
279 assert(s);
280
281 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true);
282 if (r < 0)
283 return r;
284
285 if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
286 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
287 if (r < 0)
288 return r;
289 }
290
291 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
292 }
293
294 _pure_ static bool socket_has_exec(Socket *s) {
295 unsigned i;
296 assert(s);
297
298 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
299 if (s->exec_command[i])
300 return true;
301
302 return false;
303 }
304
305 static int socket_add_extras(Socket *s) {
306 Unit *u = UNIT(s);
307 int r;
308
309 assert(s);
310
311 if (have_non_accept_socket(s)) {
312
313 if (!UNIT_DEREF(s->service)) {
314 Unit *x;
315
316 r = unit_load_related_unit(u, ".service", &x);
317 if (r < 0)
318 return r;
319
320 unit_ref_set(&s->service, x);
321 }
322
323 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
324 if (r < 0)
325 return r;
326 }
327
328 r = socket_add_mount_links(s);
329 if (r < 0)
330 return r;
331
332 r = socket_add_device_link(s);
333 if (r < 0)
334 return r;
335
336 r = unit_patch_contexts(u);
337 if (r < 0)
338 return r;
339
340 if (socket_has_exec(s)) {
341 r = unit_add_exec_dependencies(u, &s->exec_context);
342 if (r < 0)
343 return r;
344
345 r = unit_set_default_slice(u);
346 if (r < 0)
347 return r;
348 }
349
350 if (u->default_dependencies) {
351 r = socket_add_default_dependencies(s);
352 if (r < 0)
353 return r;
354 }
355
356 return 0;
357 }
358
359 static const char *socket_find_symlink_target(Socket *s) {
360 const char *found = NULL;
361 SocketPort *p;
362
363 LIST_FOREACH(port, p, s->ports) {
364 const char *f = NULL;
365
366 switch (p->type) {
367
368 case SOCKET_FIFO:
369 f = p->path;
370 break;
371
372 case SOCKET_SOCKET:
373 if (p->address.sockaddr.un.sun_path[0] != 0)
374 f = p->address.sockaddr.un.sun_path;
375 break;
376
377 default:
378 break;
379 }
380
381 if (f) {
382 if (found)
383 return NULL;
384
385 found = f;
386 }
387 }
388
389 return found;
390 }
391
392 static int socket_verify(Socket *s) {
393 assert(s);
394
395 if (UNIT(s)->load_state != UNIT_LOADED)
396 return 0;
397
398 if (!s->ports) {
399 log_unit_error(UNIT(s), "Unit lacks Listen setting. Refusing.");
400 return -EINVAL;
401 }
402
403 if (s->accept && have_non_accept_socket(s)) {
404 log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing.");
405 return -EINVAL;
406 }
407
408 if (s->accept && s->max_connections <= 0) {
409 log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
410 return -EINVAL;
411 }
412
413 if (s->accept && UNIT_DEREF(s->service)) {
414 log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
415 return -EINVAL;
416 }
417
418 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
419 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing.");
420 return -EINVAL;
421 }
422
423 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
424 log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing.");
425 return -EINVAL;
426 }
427
428 return 0;
429 }
430
431 static int socket_load(Unit *u) {
432 Socket *s = SOCKET(u);
433 int r;
434
435 assert(u);
436 assert(u->load_state == UNIT_STUB);
437
438 r = unit_load_fragment_and_dropin(u);
439 if (r < 0)
440 return r;
441
442 if (u->load_state == UNIT_LOADED) {
443 /* This is a new unit? Then let's add in some extras */
444 r = socket_add_extras(s);
445 if (r < 0)
446 return r;
447 }
448
449 return socket_verify(s);
450 }
451
452 _const_ static const char* listen_lookup(int family, int type) {
453
454 if (family == AF_NETLINK)
455 return "ListenNetlink";
456
457 if (type == SOCK_STREAM)
458 return "ListenStream";
459 else if (type == SOCK_DGRAM)
460 return "ListenDatagram";
461 else if (type == SOCK_SEQPACKET)
462 return "ListenSequentialPacket";
463
464 assert_not_reached("Unknown socket type");
465 return NULL;
466 }
467
468 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
469 char time_string[FORMAT_TIMESPAN_MAX];
470 SocketExecCommand c;
471 Socket *s = SOCKET(u);
472 SocketPort *p;
473 const char *prefix2;
474
475 assert(s);
476 assert(f);
477
478 prefix = strempty(prefix);
479 prefix2 = strjoina(prefix, "\t");
480
481 fprintf(f,
482 "%sSocket State: %s\n"
483 "%sResult: %s\n"
484 "%sBindIPv6Only: %s\n"
485 "%sBacklog: %u\n"
486 "%sSocketMode: %04o\n"
487 "%sDirectoryMode: %04o\n"
488 "%sKeepAlive: %s\n"
489 "%sNoDelay: %s\n"
490 "%sFreeBind: %s\n"
491 "%sTransparent: %s\n"
492 "%sBroadcast: %s\n"
493 "%sPassCredentials: %s\n"
494 "%sPassSecurity: %s\n"
495 "%sTCPCongestion: %s\n"
496 "%sRemoveOnStop: %s\n"
497 "%sSELinuxContextFromNet: %s\n",
498 prefix, socket_state_to_string(s->state),
499 prefix, socket_result_to_string(s->result),
500 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
501 prefix, s->backlog,
502 prefix, s->socket_mode,
503 prefix, s->directory_mode,
504 prefix, yes_no(s->keep_alive),
505 prefix, yes_no(s->no_delay),
506 prefix, yes_no(s->free_bind),
507 prefix, yes_no(s->transparent),
508 prefix, yes_no(s->broadcast),
509 prefix, yes_no(s->pass_cred),
510 prefix, yes_no(s->pass_sec),
511 prefix, strna(s->tcp_congestion),
512 prefix, yes_no(s->remove_on_stop),
513 prefix, yes_no(s->selinux_context_from_net));
514
515 if (s->control_pid > 0)
516 fprintf(f,
517 "%sControl PID: "PID_FMT"\n",
518 prefix, s->control_pid);
519
520 if (s->bind_to_device)
521 fprintf(f,
522 "%sBindToDevice: %s\n",
523 prefix, s->bind_to_device);
524
525 if (s->accept)
526 fprintf(f,
527 "%sAccepted: %u\n"
528 "%sNConnections: %u\n"
529 "%sMaxConnections: %u\n",
530 prefix, s->n_accepted,
531 prefix, s->n_connections,
532 prefix, s->max_connections);
533
534 if (s->priority >= 0)
535 fprintf(f,
536 "%sPriority: %i\n",
537 prefix, s->priority);
538
539 if (s->receive_buffer > 0)
540 fprintf(f,
541 "%sReceiveBuffer: %zu\n",
542 prefix, s->receive_buffer);
543
544 if (s->send_buffer > 0)
545 fprintf(f,
546 "%sSendBuffer: %zu\n",
547 prefix, s->send_buffer);
548
549 if (s->ip_tos >= 0)
550 fprintf(f,
551 "%sIPTOS: %i\n",
552 prefix, s->ip_tos);
553
554 if (s->ip_ttl >= 0)
555 fprintf(f,
556 "%sIPTTL: %i\n",
557 prefix, s->ip_ttl);
558
559 if (s->pipe_size > 0)
560 fprintf(f,
561 "%sPipeSize: %zu\n",
562 prefix, s->pipe_size);
563
564 if (s->mark >= 0)
565 fprintf(f,
566 "%sMark: %i\n",
567 prefix, s->mark);
568
569 if (s->mq_maxmsg > 0)
570 fprintf(f,
571 "%sMessageQueueMaxMessages: %li\n",
572 prefix, s->mq_maxmsg);
573
574 if (s->mq_msgsize > 0)
575 fprintf(f,
576 "%sMessageQueueMessageSize: %li\n",
577 prefix, s->mq_msgsize);
578
579 if (s->reuse_port)
580 fprintf(f,
581 "%sReusePort: %s\n",
582 prefix, yes_no(s->reuse_port));
583
584 if (s->smack)
585 fprintf(f,
586 "%sSmackLabel: %s\n",
587 prefix, s->smack);
588
589 if (s->smack_ip_in)
590 fprintf(f,
591 "%sSmackLabelIPIn: %s\n",
592 prefix, s->smack_ip_in);
593
594 if (s->smack_ip_out)
595 fprintf(f,
596 "%sSmackLabelIPOut: %s\n",
597 prefix, s->smack_ip_out);
598
599 if (!isempty(s->user) || !isempty(s->group))
600 fprintf(f,
601 "%sOwnerUser: %s\n"
602 "%sOwnerGroup: %s\n",
603 prefix, strna(s->user),
604 prefix, strna(s->group));
605
606 if (s->keep_alive_time > 0)
607 fprintf(f,
608 "%sKeepAliveTimeSec: %s\n",
609 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
610
611 if (s->keep_alive_interval)
612 fprintf(f,
613 "%sKeepAliveIntervalSec: %s\n",
614 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
615
616 if (s->keep_alive_cnt)
617 fprintf(f,
618 "%sKeepAliveProbes: %u\n",
619 prefix, s->keep_alive_cnt);
620
621 if (s->defer_accept)
622 fprintf(f,
623 "%sDeferAcceptSec: %s\n",
624 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
625
626 LIST_FOREACH(port, p, s->ports) {
627
628 if (p->type == SOCKET_SOCKET) {
629 const char *t;
630 int r;
631 char *k = NULL;
632
633 if ((r = socket_address_print(&p->address, &k)) < 0)
634 t = strerror(-r);
635 else
636 t = k;
637
638 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
639 free(k);
640 } else if (p->type == SOCKET_SPECIAL)
641 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
642 else if (p->type == SOCKET_MQUEUE)
643 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
644 else
645 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
646 }
647
648 exec_context_dump(&s->exec_context, f, prefix);
649 kill_context_dump(&s->kill_context, f, prefix);
650
651 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
652 if (!s->exec_command[c])
653 continue;
654
655 fprintf(f, "%s-> %s:\n",
656 prefix, socket_exec_command_to_string(c));
657
658 exec_command_dump_list(s->exec_command[c], f, prefix2);
659 }
660 }
661
662 static int instance_from_socket(int fd, unsigned nr, char **instance) {
663 socklen_t l;
664 char *r;
665 union sockaddr_union local, remote;
666
667 assert(fd >= 0);
668 assert(instance);
669
670 l = sizeof(local);
671 if (getsockname(fd, &local.sa, &l) < 0)
672 return -errno;
673
674 l = sizeof(remote);
675 if (getpeername(fd, &remote.sa, &l) < 0)
676 return -errno;
677
678 switch (local.sa.sa_family) {
679
680 case AF_INET: {
681 uint32_t
682 a = ntohl(local.in.sin_addr.s_addr),
683 b = ntohl(remote.in.sin_addr.s_addr);
684
685 if (asprintf(&r,
686 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
687 nr,
688 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
689 ntohs(local.in.sin_port),
690 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
691 ntohs(remote.in.sin_port)) < 0)
692 return -ENOMEM;
693
694 break;
695 }
696
697 case AF_INET6: {
698 static const unsigned char ipv4_prefix[] = {
699 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
700 };
701
702 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
703 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
704 const uint8_t
705 *a = local.in6.sin6_addr.s6_addr+12,
706 *b = remote.in6.sin6_addr.s6_addr+12;
707
708 if (asprintf(&r,
709 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
710 nr,
711 a[0], a[1], a[2], a[3],
712 ntohs(local.in6.sin6_port),
713 b[0], b[1], b[2], b[3],
714 ntohs(remote.in6.sin6_port)) < 0)
715 return -ENOMEM;
716 } else {
717 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
718
719 if (asprintf(&r,
720 "%u-%s:%u-%s:%u",
721 nr,
722 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
723 ntohs(local.in6.sin6_port),
724 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
725 ntohs(remote.in6.sin6_port)) < 0)
726 return -ENOMEM;
727 }
728
729 break;
730 }
731
732 case AF_UNIX: {
733 struct ucred ucred;
734 int k;
735
736 k = getpeercred(fd, &ucred);
737 if (k >= 0) {
738 if (asprintf(&r,
739 "%u-"PID_FMT"-"UID_FMT,
740 nr, ucred.pid, ucred.uid) < 0)
741 return -ENOMEM;
742 } else if (k == -ENODATA) {
743 /* This handles the case where somebody is
744 * connecting from another pid/uid namespace
745 * (e.g. from outside of our container). */
746 if (asprintf(&r,
747 "%u-unknown",
748 nr) < 0)
749 return -ENOMEM;
750 } else
751 return k;
752
753 break;
754 }
755
756 default:
757 assert_not_reached("Unhandled socket type.");
758 }
759
760 *instance = r;
761 return 0;
762 }
763
764 static void socket_close_fds(Socket *s) {
765 SocketPort *p;
766 char **i;
767
768 assert(s);
769
770 LIST_FOREACH(port, p, s->ports) {
771
772 p->event_source = sd_event_source_unref(p->event_source);
773
774 if (p->fd < 0)
775 continue;
776
777 p->fd = safe_close(p->fd);
778
779 /* One little note: we should normally not delete any
780 * sockets in the file system here! After all some
781 * other process we spawned might still have a
782 * reference of this fd and wants to continue to use
783 * it. Therefore we delete sockets in the file system
784 * before we create a new one, not after we stopped
785 * using one! */
786
787 if (s->remove_on_stop) {
788 switch (p->type) {
789
790 case SOCKET_FIFO:
791 unlink(p->path);
792 break;
793
794 case SOCKET_MQUEUE:
795 mq_unlink(p->path);
796 break;
797
798 case SOCKET_SOCKET:
799 socket_address_unlink(&p->address);
800 break;
801
802 default:
803 break;
804 }
805 }
806 }
807
808 if (s->remove_on_stop)
809 STRV_FOREACH(i, s->symlinks)
810 unlink(*i);
811 }
812
813 static void socket_apply_socket_options(Socket *s, int fd) {
814 int r;
815
816 assert(s);
817 assert(fd >= 0);
818
819 if (s->keep_alive) {
820 int b = s->keep_alive;
821 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
822 log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
823 }
824
825 if (s->keep_alive_time) {
826 int value = s->keep_alive_time / USEC_PER_SEC;
827 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
828 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m");
829 }
830
831 if (s->keep_alive_interval) {
832 int value = s->keep_alive_interval / USEC_PER_SEC;
833 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
834 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m");
835 }
836
837 if (s->keep_alive_cnt) {
838 int value = s->keep_alive_cnt;
839 if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
840 log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
841 }
842
843 if (s->defer_accept) {
844 int value = s->defer_accept / USEC_PER_SEC;
845 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
846 log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m");
847 }
848
849 if (s->no_delay) {
850 int b = s->no_delay;
851 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
852 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
853 }
854
855 if (s->broadcast) {
856 int one = 1;
857 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
858 log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
859 }
860
861 if (s->pass_cred) {
862 int one = 1;
863 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
864 log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
865 }
866
867 if (s->pass_sec) {
868 int one = 1;
869 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
870 log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
871 }
872
873 if (s->priority >= 0)
874 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
875 log_unit_warning_errno(UNIT(s), errno, "SO_PRIORITY failed: %m");
876
877 if (s->receive_buffer > 0) {
878 int value = (int) s->receive_buffer;
879
880 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
881
882 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
883 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
884 log_unit_warning_errno(UNIT(s), errno, "SO_RCVBUF failed: %m");
885 }
886
887 if (s->send_buffer > 0) {
888 int value = (int) s->send_buffer;
889 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
890 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
891 log_unit_warning_errno(UNIT(s), errno, "SO_SNDBUF failed: %m");
892 }
893
894 if (s->mark >= 0)
895 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
896 log_unit_warning_errno(UNIT(s), errno, "SO_MARK failed: %m");
897
898 if (s->ip_tos >= 0)
899 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
900 log_unit_warning_errno(UNIT(s), errno, "IP_TOS failed: %m");
901
902 if (s->ip_ttl >= 0) {
903 int x;
904
905 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
906
907 if (socket_ipv6_is_supported())
908 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
909 else {
910 x = -1;
911 errno = EAFNOSUPPORT;
912 }
913
914 if (r < 0 && x < 0)
915 log_unit_warning_errno(UNIT(s), errno, "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
916 }
917
918 if (s->tcp_congestion)
919 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
920 log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
921
922 if (s->smack_ip_in) {
923 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in);
924 if (r < 0)
925 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m");
926 }
927
928 if (s->smack_ip_out) {
929 r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out);
930 if (r < 0)
931 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m");
932 }
933 }
934
935 static void socket_apply_fifo_options(Socket *s, int fd) {
936 int r;
937
938 assert(s);
939 assert(fd >= 0);
940
941 if (s->pipe_size > 0)
942 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
943 log_unit_warning_errno(UNIT(s), errno, "F_SETPIPE_SZ: %m");
944
945 if (s->smack) {
946 r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack);
947 if (r < 0)
948 log_unit_error_errno(UNIT(s), r, "mac_smack_apply_fd: %m");
949 }
950 }
951
952 static int fifo_address_create(
953 const char *path,
954 mode_t directory_mode,
955 mode_t socket_mode,
956 int *_fd) {
957
958 int fd = -1, r = 0;
959 struct stat st;
960 mode_t old_mask;
961
962 assert(path);
963 assert(_fd);
964
965 mkdir_parents_label(path, directory_mode);
966
967 r = mac_selinux_create_file_prepare(path, S_IFIFO);
968 if (r < 0)
969 goto fail;
970
971 /* Enforce the right access mode for the fifo */
972 old_mask = umask(~ socket_mode);
973
974 /* Include the original umask in our mask */
975 umask(~socket_mode | old_mask);
976
977 r = mkfifo(path, socket_mode);
978 umask(old_mask);
979
980 if (r < 0 && errno != EEXIST) {
981 r = -errno;
982 goto fail;
983 }
984
985 fd = open(path,
986 O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
987 if (fd < 0) {
988 r = -errno;
989 goto fail;
990 }
991
992 mac_selinux_create_file_clear();
993
994 if (fstat(fd, &st) < 0) {
995 r = -errno;
996 goto fail;
997 }
998
999 if (!S_ISFIFO(st.st_mode) ||
1000 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
1001 st.st_uid != getuid() ||
1002 st.st_gid != getgid()) {
1003
1004 r = -EEXIST;
1005 goto fail;
1006 }
1007
1008 *_fd = fd;
1009 return 0;
1010
1011 fail:
1012 mac_selinux_create_file_clear();
1013 safe_close(fd);
1014
1015 return r;
1016 }
1017
1018 static int special_address_create(
1019 const char *path,
1020 int *_fd) {
1021
1022 int fd = -1, r = 0;
1023 struct stat st;
1024
1025 assert(path);
1026 assert(_fd);
1027
1028 fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1029 if (fd < 0) {
1030 r = -errno;
1031 goto fail;
1032 }
1033
1034 if (fstat(fd, &st) < 0) {
1035 r = -errno;
1036 goto fail;
1037 }
1038
1039 /* Check whether this is a /proc, /sys or /dev file or char device */
1040 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
1041 r = -EEXIST;
1042 goto fail;
1043 }
1044
1045 *_fd = fd;
1046 return 0;
1047
1048 fail:
1049 safe_close(fd);
1050
1051 return r;
1052 }
1053
1054 static int mq_address_create(
1055 const char *path,
1056 mode_t mq_mode,
1057 long maxmsg,
1058 long msgsize,
1059 int *_fd) {
1060
1061 int fd = -1, r = 0;
1062 struct stat st;
1063 mode_t old_mask;
1064 struct mq_attr _attr, *attr = NULL;
1065
1066 assert(path);
1067 assert(_fd);
1068
1069 if (maxmsg > 0 && msgsize > 0) {
1070 zero(_attr);
1071 _attr.mq_flags = O_NONBLOCK;
1072 _attr.mq_maxmsg = maxmsg;
1073 _attr.mq_msgsize = msgsize;
1074 attr = &_attr;
1075 }
1076
1077 /* Enforce the right access mode for the mq */
1078 old_mask = umask(~ mq_mode);
1079
1080 /* Include the original umask in our mask */
1081 umask(~mq_mode | old_mask);
1082 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1083 umask(old_mask);
1084
1085 if (fd < 0) {
1086 r = -errno;
1087 goto fail;
1088 }
1089
1090 if (fstat(fd, &st) < 0) {
1091 r = -errno;
1092 goto fail;
1093 }
1094
1095 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1096 st.st_uid != getuid() ||
1097 st.st_gid != getgid()) {
1098
1099 r = -EEXIST;
1100 goto fail;
1101 }
1102
1103 *_fd = fd;
1104 return 0;
1105
1106 fail:
1107 safe_close(fd);
1108 return r;
1109 }
1110
1111 static int socket_symlink(Socket *s) {
1112 const char *p;
1113 char **i;
1114
1115 assert(s);
1116
1117 p = socket_find_symlink_target(s);
1118 if (!p)
1119 return 0;
1120
1121 STRV_FOREACH(i, s->symlinks)
1122 symlink_label(p, *i);
1123
1124 return 0;
1125 }
1126
1127 static int socket_open_fds(Socket *s) {
1128 SocketPort *p;
1129 int r;
1130 char *label = NULL;
1131 bool know_label = false;
1132
1133 assert(s);
1134
1135 LIST_FOREACH(port, p, s->ports) {
1136
1137 if (p->fd >= 0)
1138 continue;
1139
1140 if (p->type == SOCKET_SOCKET) {
1141
1142 if (!know_label) {
1143 /* Figure out label, if we don't it know
1144 * yet. We do it once, for the first
1145 * socket where we need this and
1146 * remember it for the rest. */
1147
1148 if (s->selinux_context_from_net) {
1149 /* Get it from the network label */
1150
1151 r = mac_selinux_get_our_label(&label);
1152 if (r < 0 && r != -EOPNOTSUPP)
1153 goto rollback;
1154
1155 } else {
1156 /* Get it from the executable we are about to start */
1157
1158 r = socket_instantiate_service(s);
1159 if (r < 0)
1160 goto rollback;
1161
1162 if (UNIT_ISSET(s->service) &&
1163 SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
1164 r = mac_selinux_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
1165 if (r < 0 && r != -EPERM && r != -EOPNOTSUPP)
1166 goto rollback;
1167 }
1168 }
1169
1170 know_label = true;
1171 }
1172
1173 r = socket_address_listen(
1174 &p->address,
1175 SOCK_CLOEXEC|SOCK_NONBLOCK,
1176 s->backlog,
1177 s->bind_ipv6_only,
1178 s->bind_to_device,
1179 s->reuse_port,
1180 s->free_bind,
1181 s->transparent,
1182 s->directory_mode,
1183 s->socket_mode,
1184 label);
1185 if (r < 0)
1186 goto rollback;
1187
1188 p->fd = r;
1189 socket_apply_socket_options(s, p->fd);
1190 socket_symlink(s);
1191
1192 } else if (p->type == SOCKET_SPECIAL) {
1193
1194 r = special_address_create(
1195 p->path,
1196 &p->fd);
1197 if (r < 0)
1198 goto rollback;
1199
1200 } else if (p->type == SOCKET_FIFO) {
1201
1202 r = fifo_address_create(
1203 p->path,
1204 s->directory_mode,
1205 s->socket_mode,
1206 &p->fd);
1207 if (r < 0)
1208 goto rollback;
1209
1210 socket_apply_fifo_options(s, p->fd);
1211 socket_symlink(s);
1212
1213 } else if (p->type == SOCKET_MQUEUE) {
1214
1215 r = mq_address_create(
1216 p->path,
1217 s->socket_mode,
1218 s->mq_maxmsg,
1219 s->mq_msgsize,
1220 &p->fd);
1221 if (r < 0)
1222 goto rollback;
1223 } else
1224 assert_not_reached("Unknown port type");
1225 }
1226
1227 mac_selinux_free(label);
1228 return 0;
1229
1230 rollback:
1231 socket_close_fds(s);
1232 mac_selinux_free(label);
1233
1234 return r;
1235 }
1236
1237 static void socket_unwatch_fds(Socket *s) {
1238 SocketPort *p;
1239 int r;
1240
1241 assert(s);
1242
1243 LIST_FOREACH(port, p, s->ports) {
1244 if (p->fd < 0)
1245 continue;
1246
1247 if (!p->event_source)
1248 continue;
1249
1250 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1251 if (r < 0)
1252 log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m");
1253 }
1254 }
1255
1256 static int socket_watch_fds(Socket *s) {
1257 SocketPort *p;
1258 int r;
1259
1260 assert(s);
1261
1262 LIST_FOREACH(port, p, s->ports) {
1263 if (p->fd < 0)
1264 continue;
1265
1266 if (p->event_source) {
1267 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1268 if (r < 0)
1269 goto fail;
1270 } else {
1271 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1272 if (r < 0)
1273 goto fail;
1274
1275 (void) sd_event_source_set_description(p->event_source, "socket-port-io");
1276 }
1277 }
1278
1279 return 0;
1280
1281 fail:
1282 log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m");
1283 socket_unwatch_fds(s);
1284 return r;
1285 }
1286
1287 static void socket_set_state(Socket *s, SocketState state) {
1288 SocketState old_state;
1289 assert(s);
1290
1291 old_state = s->state;
1292 s->state = state;
1293
1294 if (!IN_SET(state,
1295 SOCKET_START_PRE,
1296 SOCKET_START_CHOWN,
1297 SOCKET_START_POST,
1298 SOCKET_STOP_PRE,
1299 SOCKET_STOP_PRE_SIGTERM,
1300 SOCKET_STOP_PRE_SIGKILL,
1301 SOCKET_STOP_POST,
1302 SOCKET_FINAL_SIGTERM,
1303 SOCKET_FINAL_SIGKILL)) {
1304
1305 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1306 socket_unwatch_control_pid(s);
1307 s->control_command = NULL;
1308 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1309 }
1310
1311 if (state != SOCKET_LISTENING)
1312 socket_unwatch_fds(s);
1313
1314 if (!IN_SET(state,
1315 SOCKET_START_CHOWN,
1316 SOCKET_START_POST,
1317 SOCKET_LISTENING,
1318 SOCKET_RUNNING,
1319 SOCKET_STOP_PRE,
1320 SOCKET_STOP_PRE_SIGTERM,
1321 SOCKET_STOP_PRE_SIGKILL))
1322 socket_close_fds(s);
1323
1324 if (state != old_state)
1325 log_unit_debug(UNIT(s), "Changed %s -> %s", socket_state_to_string(old_state), socket_state_to_string(state));
1326
1327 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1328 }
1329
1330 static int socket_coldplug(Unit *u) {
1331 Socket *s = SOCKET(u);
1332 int r;
1333
1334 assert(s);
1335 assert(s->state == SOCKET_DEAD);
1336
1337 if (s->deserialized_state == s->state)
1338 return 0;
1339
1340 if (IN_SET(s->deserialized_state,
1341 SOCKET_START_PRE,
1342 SOCKET_START_CHOWN,
1343 SOCKET_START_POST,
1344 SOCKET_STOP_PRE,
1345 SOCKET_STOP_PRE_SIGTERM,
1346 SOCKET_STOP_PRE_SIGKILL,
1347 SOCKET_STOP_POST,
1348 SOCKET_FINAL_SIGTERM,
1349 SOCKET_FINAL_SIGKILL)) {
1350
1351 if (s->control_pid <= 0)
1352 return -EBADMSG;
1353
1354 r = unit_watch_pid(UNIT(s), s->control_pid);
1355 if (r < 0)
1356 return r;
1357
1358 r = socket_arm_timer(s);
1359 if (r < 0)
1360 return r;
1361 }
1362
1363 if (IN_SET(s->deserialized_state,
1364 SOCKET_START_CHOWN,
1365 SOCKET_START_POST,
1366 SOCKET_LISTENING,
1367 SOCKET_RUNNING,
1368 SOCKET_STOP_PRE,
1369 SOCKET_STOP_PRE_SIGTERM,
1370 SOCKET_STOP_PRE_SIGKILL)) {
1371 r = socket_open_fds(s);
1372 if (r < 0)
1373 return r;
1374 }
1375
1376 if (s->deserialized_state == SOCKET_LISTENING) {
1377 r = socket_watch_fds(s);
1378 if (r < 0)
1379 return r;
1380 }
1381
1382 socket_set_state(s, s->deserialized_state);
1383 return 0;
1384 }
1385
1386 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1387 _cleanup_free_ char **argv = NULL;
1388 pid_t pid;
1389 int r;
1390 ExecParameters exec_params = {
1391 .apply_permissions = true,
1392 .apply_chroot = true,
1393 .apply_tty_stdin = true,
1394 .bus_endpoint_fd = -1,
1395 };
1396
1397 assert(s);
1398 assert(c);
1399 assert(_pid);
1400
1401 (void) unit_realize_cgroup(UNIT(s));
1402 if (s->reset_cpu_usage) {
1403 (void) unit_reset_cpu_usage(UNIT(s));
1404 s->reset_cpu_usage = false;
1405 }
1406
1407 r = unit_setup_exec_runtime(UNIT(s));
1408 if (r < 0)
1409 goto fail;
1410
1411 r = socket_arm_timer(s);
1412 if (r < 0)
1413 goto fail;
1414
1415 r = unit_full_printf_strv(UNIT(s), c->argv, &argv);
1416 if (r < 0)
1417 goto fail;
1418
1419 exec_params.argv = argv;
1420 exec_params.environment = UNIT(s)->manager->environment;
1421 exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
1422 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
1423 exec_params.cgroup_path = UNIT(s)->cgroup_path;
1424 exec_params.cgroup_delegate = s->cgroup_context.delegate;
1425 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
1426
1427 r = exec_spawn(UNIT(s),
1428 c,
1429 &s->exec_context,
1430 &exec_params,
1431 s->exec_runtime,
1432 &pid);
1433 if (r < 0)
1434 goto fail;
1435
1436 r = unit_watch_pid(UNIT(s), pid);
1437 if (r < 0)
1438 /* FIXME: we need to do something here */
1439 goto fail;
1440
1441 *_pid = pid;
1442 return 0;
1443
1444 fail:
1445 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1446 return r;
1447 }
1448
1449 static int socket_chown(Socket *s, pid_t *_pid) {
1450 pid_t pid;
1451 int r;
1452
1453 r = socket_arm_timer(s);
1454 if (r < 0)
1455 goto fail;
1456
1457 /* We have to resolve the user names out-of-process, hence
1458 * let's fork here. It's messy, but well, what can we do? */
1459
1460 pid = fork();
1461 if (pid < 0)
1462 return -errno;
1463
1464 if (pid == 0) {
1465 SocketPort *p;
1466 uid_t uid = UID_INVALID;
1467 gid_t gid = GID_INVALID;
1468 int ret;
1469
1470 (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1);
1471 (void) ignore_signals(SIGPIPE, -1);
1472 log_forget_fds();
1473
1474 if (!isempty(s->user)) {
1475 const char *user = s->user;
1476
1477 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1478 if (r < 0) {
1479 ret = EXIT_USER;
1480 goto fail_child;
1481 }
1482 }
1483
1484 if (!isempty(s->group)) {
1485 const char *group = s->group;
1486
1487 r = get_group_creds(&group, &gid);
1488 if (r < 0) {
1489 ret = EXIT_GROUP;
1490 goto fail_child;
1491 }
1492 }
1493
1494 LIST_FOREACH(port, p, s->ports) {
1495 const char *path = NULL;
1496
1497 if (p->type == SOCKET_SOCKET)
1498 path = socket_address_get_path(&p->address);
1499 else if (p->type == SOCKET_FIFO)
1500 path = p->path;
1501
1502 if (!path)
1503 continue;
1504
1505 if (chown(path, uid, gid) < 0) {
1506 r = -errno;
1507 ret = EXIT_CHOWN;
1508 goto fail_child;
1509 }
1510 }
1511
1512 _exit(0);
1513
1514 fail_child:
1515 log_open();
1516 log_error_errno(r, "Failed to chown socket at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD));
1517
1518 _exit(ret);
1519 }
1520
1521 r = unit_watch_pid(UNIT(s), pid);
1522 if (r < 0)
1523 goto fail;
1524
1525 *_pid = pid;
1526 return 0;
1527
1528 fail:
1529 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1530 return r;
1531 }
1532
1533 static void socket_enter_dead(Socket *s, SocketResult f) {
1534 assert(s);
1535
1536 if (f != SOCKET_SUCCESS)
1537 s->result = f;
1538
1539 exec_runtime_destroy(s->exec_runtime);
1540 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1541
1542 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
1543
1544 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1545 }
1546
1547 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1548
1549 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1550 int r;
1551 assert(s);
1552
1553 if (f != SOCKET_SUCCESS)
1554 s->result = f;
1555
1556 socket_unwatch_control_pid(s);
1557 s->control_command_id = SOCKET_EXEC_STOP_POST;
1558 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
1559
1560 if (s->control_command) {
1561 r = socket_spawn(s, s->control_command, &s->control_pid);
1562 if (r < 0)
1563 goto fail;
1564
1565 socket_set_state(s, SOCKET_STOP_POST);
1566 } else
1567 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1568
1569 return;
1570
1571 fail:
1572 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1573 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1574 }
1575
1576 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1577 int r;
1578
1579 assert(s);
1580
1581 if (f != SOCKET_SUCCESS)
1582 s->result = f;
1583
1584 r = unit_kill_context(
1585 UNIT(s),
1586 &s->kill_context,
1587 (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ?
1588 KILL_KILL : KILL_TERMINATE,
1589 -1,
1590 s->control_pid,
1591 false);
1592 if (r < 0)
1593 goto fail;
1594
1595 if (r > 0) {
1596 r = socket_arm_timer(s);
1597 if (r < 0)
1598 goto fail;
1599
1600 socket_set_state(s, state);
1601 } else if (state == SOCKET_STOP_PRE_SIGTERM)
1602 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
1603 else if (state == SOCKET_STOP_PRE_SIGKILL)
1604 socket_enter_stop_post(s, SOCKET_SUCCESS);
1605 else if (state == SOCKET_FINAL_SIGTERM)
1606 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
1607 else
1608 socket_enter_dead(s, SOCKET_SUCCESS);
1609
1610 return;
1611
1612 fail:
1613 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1614
1615 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1616 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1617 else
1618 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1619 }
1620
1621 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1622 int r;
1623 assert(s);
1624
1625 if (f != SOCKET_SUCCESS)
1626 s->result = f;
1627
1628 socket_unwatch_control_pid(s);
1629 s->control_command_id = SOCKET_EXEC_STOP_PRE;
1630 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
1631
1632 if (s->control_command) {
1633 r = socket_spawn(s, s->control_command, &s->control_pid);
1634 if (r < 0)
1635 goto fail;
1636
1637 socket_set_state(s, SOCKET_STOP_PRE);
1638 } else
1639 socket_enter_stop_post(s, SOCKET_SUCCESS);
1640
1641 return;
1642
1643 fail:
1644 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m");
1645 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1646 }
1647
1648 static void socket_enter_listening(Socket *s) {
1649 int r;
1650 assert(s);
1651
1652 r = socket_watch_fds(s);
1653 if (r < 0) {
1654 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
1655 goto fail;
1656 }
1657
1658 socket_set_state(s, SOCKET_LISTENING);
1659 return;
1660
1661 fail:
1662 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1663 }
1664
1665 static void socket_enter_start_post(Socket *s) {
1666 int r;
1667 assert(s);
1668
1669 socket_unwatch_control_pid(s);
1670 s->control_command_id = SOCKET_EXEC_START_POST;
1671 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
1672
1673 if (s->control_command) {
1674 r = socket_spawn(s, s->control_command, &s->control_pid);
1675 if (r < 0) {
1676 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
1677 goto fail;
1678 }
1679
1680 socket_set_state(s, SOCKET_START_POST);
1681 } else
1682 socket_enter_listening(s);
1683
1684 return;
1685
1686 fail:
1687 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1688 }
1689
1690 static void socket_enter_start_chown(Socket *s) {
1691 int r;
1692
1693 assert(s);
1694
1695 r = socket_open_fds(s);
1696 if (r < 0) {
1697 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
1698 goto fail;
1699 }
1700
1701 if (!isempty(s->user) || !isempty(s->group)) {
1702
1703 socket_unwatch_control_pid(s);
1704 s->control_command_id = SOCKET_EXEC_START_CHOWN;
1705 s->control_command = NULL;
1706
1707 r = socket_chown(s, &s->control_pid);
1708 if (r < 0) {
1709 log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m");
1710 goto fail;
1711 }
1712
1713 socket_set_state(s, SOCKET_START_CHOWN);
1714 } else
1715 socket_enter_start_post(s);
1716
1717 return;
1718
1719 fail:
1720 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1721 }
1722
1723 static void socket_enter_start_pre(Socket *s) {
1724 int r;
1725 assert(s);
1726
1727 socket_unwatch_control_pid(s);
1728 s->control_command_id = SOCKET_EXEC_START_PRE;
1729 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
1730
1731 if (s->control_command) {
1732 r = socket_spawn(s, s->control_command, &s->control_pid);
1733 if (r < 0) {
1734 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
1735 goto fail;
1736 }
1737
1738 socket_set_state(s, SOCKET_START_PRE);
1739 } else
1740 socket_enter_start_chown(s);
1741
1742 return;
1743
1744 fail:
1745 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1746 }
1747
1748 static void socket_enter_running(Socket *s, int cfd) {
1749 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1750 int r;
1751
1752 assert(s);
1753
1754 /* We don't take connections anymore if we are supposed to
1755 * shut down anyway */
1756 if (unit_stop_pending(UNIT(s))) {
1757
1758 log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled.");
1759
1760 if (cfd >= 0)
1761 safe_close(cfd);
1762 else {
1763 /* Flush all sockets by closing and reopening them */
1764 socket_close_fds(s);
1765
1766 r = socket_open_fds(s);
1767 if (r < 0) {
1768 log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m");
1769 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1770 return;
1771 }
1772
1773 r = socket_watch_fds(s);
1774 if (r < 0) {
1775 log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m");
1776 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1777 }
1778 }
1779
1780 return;
1781 }
1782
1783 if (cfd < 0) {
1784 Iterator i;
1785 Unit *other;
1786 bool pending = false;
1787
1788 /* If there's already a start pending don't bother to
1789 * do anything */
1790 SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
1791 if (unit_active_or_pending(other)) {
1792 pending = true;
1793 break;
1794 }
1795
1796 if (!pending) {
1797 if (!UNIT_ISSET(s->service)) {
1798 log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
1799 r = -ENOENT;
1800 goto fail;
1801 }
1802
1803 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
1804 if (r < 0)
1805 goto fail;
1806 }
1807
1808 socket_set_state(s, SOCKET_RUNNING);
1809 } else {
1810 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1811 Service *service;
1812
1813 if (s->n_connections >= s->max_connections) {
1814 log_unit_warning(UNIT(s), "Too many incoming connections (%u)", s->n_connections);
1815 safe_close(cfd);
1816 return;
1817 }
1818
1819 r = socket_instantiate_service(s);
1820 if (r < 0)
1821 goto fail;
1822
1823 r = instance_from_socket(cfd, s->n_accepted, &instance);
1824 if (r < 0) {
1825 if (r != -ENOTCONN)
1826 goto fail;
1827
1828 /* ENOTCONN is legitimate if TCP RST was received.
1829 * This connection is over, but the socket unit lives on. */
1830 safe_close(cfd);
1831 return;
1832 }
1833
1834 r = unit_name_to_prefix(UNIT(s)->id, &prefix);
1835 if (r < 0)
1836 goto fail;
1837
1838 r = unit_name_build(prefix, instance, ".service", &name);
1839 if (r < 0)
1840 goto fail;
1841
1842 r = unit_add_name(UNIT_DEREF(s->service), name);
1843 if (r < 0)
1844 goto fail;
1845
1846 service = SERVICE(UNIT_DEREF(s->service));
1847 unit_ref_unset(&s->service);
1848 s->n_accepted ++;
1849
1850 UNIT(service)->no_gc = false;
1851
1852 unit_choose_id(UNIT(service), name);
1853
1854 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
1855 if (r < 0)
1856 goto fail;
1857
1858 cfd = -1;
1859 s->n_connections ++;
1860
1861 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
1862 if (r < 0)
1863 goto fail;
1864
1865 /* Notify clients about changed counters */
1866 unit_add_to_dbus_queue(UNIT(s));
1867 }
1868
1869 return;
1870
1871 fail:
1872 log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
1873 cfd >= 0 ? "template" : "non-template",
1874 bus_error_message(&error, r));
1875
1876 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1877 safe_close(cfd);
1878 }
1879
1880 static void socket_run_next(Socket *s) {
1881 int r;
1882
1883 assert(s);
1884 assert(s->control_command);
1885 assert(s->control_command->command_next);
1886
1887 socket_unwatch_control_pid(s);
1888
1889 s->control_command = s->control_command->command_next;
1890
1891 r = socket_spawn(s, s->control_command, &s->control_pid);
1892 if (r < 0)
1893 goto fail;
1894
1895 return;
1896
1897 fail:
1898 log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m");
1899
1900 if (s->state == SOCKET_START_POST)
1901 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1902 else if (s->state == SOCKET_STOP_POST)
1903 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1904 else
1905 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1906 }
1907
1908 static int socket_start(Unit *u) {
1909 Socket *s = SOCKET(u);
1910
1911 assert(s);
1912
1913 /* We cannot fulfill this request right now, try again later
1914 * please! */
1915 if (IN_SET(s->state,
1916 SOCKET_STOP_PRE,
1917 SOCKET_STOP_PRE_SIGKILL,
1918 SOCKET_STOP_PRE_SIGTERM,
1919 SOCKET_STOP_POST,
1920 SOCKET_FINAL_SIGTERM,
1921 SOCKET_FINAL_SIGKILL))
1922 return -EAGAIN;
1923
1924 /* Already on it! */
1925 if (IN_SET(s->state,
1926 SOCKET_START_PRE,
1927 SOCKET_START_CHOWN,
1928 SOCKET_START_POST))
1929 return 0;
1930
1931 /* Cannot run this without the service being around */
1932 if (UNIT_ISSET(s->service)) {
1933 Service *service;
1934
1935 service = SERVICE(UNIT_DEREF(s->service));
1936
1937 if (UNIT(service)->load_state != UNIT_LOADED) {
1938 log_unit_error(u, "Socket service %s not loaded, refusing.", UNIT(service)->id);
1939 return -ENOENT;
1940 }
1941
1942 /* If the service is already active we cannot start the
1943 * socket */
1944 if (service->state != SERVICE_DEAD &&
1945 service->state != SERVICE_FAILED &&
1946 service->state != SERVICE_AUTO_RESTART) {
1947 log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
1948 return -EBUSY;
1949 }
1950 }
1951
1952 assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1953
1954 s->result = SOCKET_SUCCESS;
1955 s->reset_cpu_usage = true;
1956
1957 socket_enter_start_pre(s);
1958
1959 return 1;
1960 }
1961
1962 static int socket_stop(Unit *u) {
1963 Socket *s = SOCKET(u);
1964
1965 assert(s);
1966
1967 /* Already on it */
1968 if (IN_SET(s->state,
1969 SOCKET_STOP_PRE,
1970 SOCKET_STOP_PRE_SIGTERM,
1971 SOCKET_STOP_PRE_SIGKILL,
1972 SOCKET_STOP_POST,
1973 SOCKET_FINAL_SIGTERM,
1974 SOCKET_FINAL_SIGKILL))
1975 return 0;
1976
1977 /* If there's already something running we go directly into
1978 * kill mode. */
1979 if (IN_SET(s->state,
1980 SOCKET_START_PRE,
1981 SOCKET_START_CHOWN,
1982 SOCKET_START_POST)) {
1983 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
1984 return -EAGAIN;
1985 }
1986
1987 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1988
1989 socket_enter_stop_pre(s, SOCKET_SUCCESS);
1990 return 1;
1991 }
1992
1993 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1994 Socket *s = SOCKET(u);
1995 SocketPort *p;
1996 int r;
1997
1998 assert(u);
1999 assert(f);
2000 assert(fds);
2001
2002 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
2003 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
2004 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
2005
2006 if (s->control_pid > 0)
2007 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2008
2009 if (s->control_command_id >= 0)
2010 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2011
2012 LIST_FOREACH(port, p, s->ports) {
2013 int copy;
2014
2015 if (p->fd < 0)
2016 continue;
2017
2018 copy = fdset_put_dup(fds, p->fd);
2019 if (copy < 0)
2020 return copy;
2021
2022 if (p->type == SOCKET_SOCKET) {
2023 _cleanup_free_ char *t = NULL;
2024
2025 r = socket_address_print(&p->address, &t);
2026 if (r < 0)
2027 return r;
2028
2029 if (socket_address_family(&p->address) == AF_NETLINK)
2030 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2031 else
2032 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2033
2034 } else if (p->type == SOCKET_SPECIAL)
2035 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2036 else if (p->type == SOCKET_MQUEUE)
2037 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2038 else {
2039 assert(p->type == SOCKET_FIFO);
2040 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2041 }
2042 }
2043
2044 return 0;
2045 }
2046
2047 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2048 Socket *s = SOCKET(u);
2049
2050 assert(u);
2051 assert(key);
2052 assert(value);
2053
2054 if (streq(key, "state")) {
2055 SocketState state;
2056
2057 state = socket_state_from_string(value);
2058 if (state < 0)
2059 log_unit_debug(u, "Failed to parse state value: %s", value);
2060 else
2061 s->deserialized_state = state;
2062 } else if (streq(key, "result")) {
2063 SocketResult f;
2064
2065 f = socket_result_from_string(value);
2066 if (f < 0)
2067 log_unit_debug(u, "Failed to parse result value: %s", value);
2068 else if (f != SOCKET_SUCCESS)
2069 s->result = f;
2070
2071 } else if (streq(key, "n-accepted")) {
2072 unsigned k;
2073
2074 if (safe_atou(value, &k) < 0)
2075 log_unit_debug(u, "Failed to parse n-accepted value: %s", value);
2076 else
2077 s->n_accepted += k;
2078 } else if (streq(key, "control-pid")) {
2079 pid_t pid;
2080
2081 if (parse_pid(value, &pid) < 0)
2082 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2083 else
2084 s->control_pid = pid;
2085 } else if (streq(key, "control-command")) {
2086 SocketExecCommand id;
2087
2088 id = socket_exec_command_from_string(value);
2089 if (id < 0)
2090 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
2091 else {
2092 s->control_command_id = id;
2093 s->control_command = s->exec_command[id];
2094 }
2095 } else if (streq(key, "fifo")) {
2096 int fd, skip = 0;
2097 SocketPort *p;
2098
2099 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2100 log_unit_debug(u, "Failed to parse fifo value: %s", value);
2101 else {
2102
2103 LIST_FOREACH(port, p, s->ports)
2104 if (p->type == SOCKET_FIFO &&
2105 path_equal_or_files_same(p->path, value+skip))
2106 break;
2107
2108 if (p) {
2109 safe_close(p->fd);
2110 p->fd = fdset_remove(fds, fd);
2111 }
2112 }
2113
2114 } else if (streq(key, "special")) {
2115 int fd, skip = 0;
2116 SocketPort *p;
2117
2118 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2119 log_unit_debug(u, "Failed to parse special value: %s", value);
2120 else {
2121
2122 LIST_FOREACH(port, p, s->ports)
2123 if (p->type == SOCKET_SPECIAL &&
2124 path_equal_or_files_same(p->path, value+skip))
2125 break;
2126
2127 if (p) {
2128 safe_close(p->fd);
2129 p->fd = fdset_remove(fds, fd);
2130 }
2131 }
2132
2133 } else if (streq(key, "mqueue")) {
2134 int fd, skip = 0;
2135 SocketPort *p;
2136
2137 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2138 log_unit_debug(u, "Failed to parse mqueue value: %s", value);
2139 else {
2140
2141 LIST_FOREACH(port, p, s->ports)
2142 if (p->type == SOCKET_MQUEUE &&
2143 streq(p->path, value+skip))
2144 break;
2145
2146 if (p) {
2147 safe_close(p->fd);
2148 p->fd = fdset_remove(fds, fd);
2149 }
2150 }
2151
2152 } else if (streq(key, "socket")) {
2153 int fd, type, skip = 0;
2154 SocketPort *p;
2155
2156 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2157 log_unit_debug(u, "Failed to parse socket value: %s", value);
2158 else {
2159
2160 LIST_FOREACH(port, p, s->ports)
2161 if (socket_address_is(&p->address, value+skip, type))
2162 break;
2163
2164 if (p) {
2165 safe_close(p->fd);
2166 p->fd = fdset_remove(fds, fd);
2167 }
2168 }
2169
2170 } else if (streq(key, "netlink")) {
2171 int fd, skip = 0;
2172 SocketPort *p;
2173
2174 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2175 log_unit_debug(u, "Failed to parse socket value: %s", value);
2176 else {
2177
2178 LIST_FOREACH(port, p, s->ports)
2179 if (socket_address_is_netlink(&p->address, value+skip))
2180 break;
2181
2182 if (p) {
2183 safe_close(p->fd);
2184 p->fd = fdset_remove(fds, fd);
2185 }
2186 }
2187 } else
2188 log_unit_debug(UNIT(s), "Unknown serialization key: %s", key);
2189
2190 return 0;
2191 }
2192
2193 static int socket_distribute_fds(Unit *u, FDSet *fds) {
2194 Socket *s = SOCKET(u);
2195 SocketPort *p;
2196
2197 assert(u);
2198
2199 LIST_FOREACH(port, p, s->ports) {
2200 Iterator i;
2201 int fd;
2202
2203 if (p->type != SOCKET_SOCKET)
2204 continue;
2205
2206 if (p->fd >= 0)
2207 continue;
2208
2209 FDSET_FOREACH(fd, fds, i) {
2210 if (socket_address_matches_fd(&p->address, fd)) {
2211 p->fd = fdset_remove(fds, fd);
2212 s->deserialized_state = SOCKET_LISTENING;
2213 break;
2214 }
2215 }
2216 }
2217
2218 return 0;
2219 }
2220
2221 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2222 assert(u);
2223
2224 return state_translation_table[SOCKET(u)->state];
2225 }
2226
2227 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2228 assert(u);
2229
2230 return socket_state_to_string(SOCKET(u)->state);
2231 }
2232
2233 const char* socket_port_type_to_string(SocketPort *p) {
2234
2235 assert(p);
2236
2237 switch (p->type) {
2238
2239 case SOCKET_SOCKET:
2240
2241 switch (p->address.type) {
2242
2243 case SOCK_STREAM:
2244 return "Stream";
2245
2246 case SOCK_DGRAM:
2247 return "Datagram";
2248
2249 case SOCK_SEQPACKET:
2250 return "SequentialPacket";
2251
2252 case SOCK_RAW:
2253 if (socket_address_family(&p->address) == AF_NETLINK)
2254 return "Netlink";
2255
2256 default:
2257 return NULL;
2258 }
2259
2260 case SOCKET_SPECIAL:
2261 return "Special";
2262
2263 case SOCKET_MQUEUE:
2264 return "MessageQueue";
2265
2266 case SOCKET_FIFO:
2267 return "FIFO";
2268
2269 default:
2270 return NULL;
2271 }
2272 }
2273
2274 _pure_ static bool socket_check_gc(Unit *u) {
2275 Socket *s = SOCKET(u);
2276
2277 assert(u);
2278
2279 return s->n_connections > 0;
2280 }
2281
2282 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2283 SocketPort *p = userdata;
2284 int cfd = -1;
2285
2286 assert(p);
2287 assert(fd >= 0);
2288
2289 if (p->socket->state != SOCKET_LISTENING)
2290 return 0;
2291
2292 log_unit_debug(UNIT(p->socket), "Incoming traffic");
2293
2294 if (revents != EPOLLIN) {
2295
2296 if (revents & EPOLLHUP)
2297 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.");
2298 else
2299 log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents);
2300
2301 goto fail;
2302 }
2303
2304 if (p->socket->accept &&
2305 p->type == SOCKET_SOCKET &&
2306 socket_address_can_accept(&p->address)) {
2307
2308 for (;;) {
2309
2310 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2311 if (cfd < 0) {
2312
2313 if (errno == EINTR)
2314 continue;
2315
2316 log_unit_error_errno(UNIT(p->socket), errno, "Failed to accept socket: %m");
2317 goto fail;
2318 }
2319
2320 break;
2321 }
2322
2323 socket_apply_socket_options(p->socket, cfd);
2324 }
2325
2326 socket_enter_running(p->socket, cfd);
2327 return 0;
2328
2329 fail:
2330 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2331 return 0;
2332 }
2333
2334 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2335 Socket *s = SOCKET(u);
2336 SocketResult f;
2337
2338 assert(s);
2339 assert(pid >= 0);
2340
2341 if (pid != s->control_pid)
2342 return;
2343
2344 s->control_pid = 0;
2345
2346 if (is_clean_exit(code, status, NULL))
2347 f = SOCKET_SUCCESS;
2348 else if (code == CLD_EXITED)
2349 f = SOCKET_FAILURE_EXIT_CODE;
2350 else if (code == CLD_KILLED)
2351 f = SOCKET_FAILURE_SIGNAL;
2352 else if (code == CLD_DUMPED)
2353 f = SOCKET_FAILURE_CORE_DUMP;
2354 else
2355 assert_not_reached("Unknown sigchld code");
2356
2357 if (s->control_command) {
2358 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2359
2360 if (s->control_command->ignore)
2361 f = SOCKET_SUCCESS;
2362 }
2363
2364 log_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
2365 "Control process exited, code=%s status=%i",
2366 sigchld_code_to_string(code), status);
2367
2368 if (f != SOCKET_SUCCESS)
2369 s->result = f;
2370
2371 if (s->control_command &&
2372 s->control_command->command_next &&
2373 f == SOCKET_SUCCESS) {
2374
2375 log_unit_debug(u, "Running next command for state %s", socket_state_to_string(s->state));
2376 socket_run_next(s);
2377 } else {
2378 s->control_command = NULL;
2379 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
2380
2381 /* No further commands for this step, so let's figure
2382 * out what to do next */
2383
2384 log_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state));
2385
2386 switch (s->state) {
2387
2388 case SOCKET_START_PRE:
2389 if (f == SOCKET_SUCCESS)
2390 socket_enter_start_chown(s);
2391 else
2392 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2393 break;
2394
2395 case SOCKET_START_CHOWN:
2396 if (f == SOCKET_SUCCESS)
2397 socket_enter_start_post(s);
2398 else
2399 socket_enter_stop_pre(s, f);
2400 break;
2401
2402 case SOCKET_START_POST:
2403 if (f == SOCKET_SUCCESS)
2404 socket_enter_listening(s);
2405 else
2406 socket_enter_stop_pre(s, f);
2407 break;
2408
2409 case SOCKET_STOP_PRE:
2410 case SOCKET_STOP_PRE_SIGTERM:
2411 case SOCKET_STOP_PRE_SIGKILL:
2412 socket_enter_stop_post(s, f);
2413 break;
2414
2415 case SOCKET_STOP_POST:
2416 case SOCKET_FINAL_SIGTERM:
2417 case SOCKET_FINAL_SIGKILL:
2418 socket_enter_dead(s, f);
2419 break;
2420
2421 default:
2422 assert_not_reached("Uh, control process died at wrong time.");
2423 }
2424 }
2425
2426 /* Notify clients about changed exit status */
2427 unit_add_to_dbus_queue(u);
2428 }
2429
2430 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
2431 Socket *s = SOCKET(userdata);
2432
2433 assert(s);
2434 assert(s->timer_event_source == source);
2435
2436 switch (s->state) {
2437
2438 case SOCKET_START_PRE:
2439 log_unit_warning(UNIT(s), "Starting timed out. Terminating.");
2440 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2441 break;
2442
2443 case SOCKET_START_CHOWN:
2444 case SOCKET_START_POST:
2445 log_unit_warning(UNIT(s), "Starting timed out. Stopping.");
2446 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
2447 break;
2448
2449 case SOCKET_STOP_PRE:
2450 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
2451 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2452 break;
2453
2454 case SOCKET_STOP_PRE_SIGTERM:
2455 if (s->kill_context.send_sigkill) {
2456 log_unit_warning(UNIT(s), "Stopping timed out. Killing.");
2457 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2458 } else {
2459 log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring.");
2460 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2461 }
2462 break;
2463
2464 case SOCKET_STOP_PRE_SIGKILL:
2465 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
2466 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2467 break;
2468
2469 case SOCKET_STOP_POST:
2470 log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating.");
2471 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2472 break;
2473
2474 case SOCKET_FINAL_SIGTERM:
2475 if (s->kill_context.send_sigkill) {
2476 log_unit_warning(UNIT(s), "Stopping timed out (2). Killing.");
2477 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2478 } else {
2479 log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring.");
2480 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2481 }
2482 break;
2483
2484 case SOCKET_FINAL_SIGKILL:
2485 log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode.");
2486 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2487 break;
2488
2489 default:
2490 assert_not_reached("Timeout at wrong time.");
2491 }
2492
2493 return 0;
2494 }
2495
2496 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
2497 int *rfds;
2498 unsigned rn_fds, k;
2499 SocketPort *p;
2500
2501 assert(s);
2502 assert(fds);
2503 assert(n_fds);
2504
2505 /* Called from the service code for requesting our fds */
2506
2507 rn_fds = 0;
2508 LIST_FOREACH(port, p, s->ports)
2509 if (p->fd >= 0)
2510 rn_fds++;
2511
2512 if (rn_fds <= 0) {
2513 *fds = NULL;
2514 *n_fds = 0;
2515 return 0;
2516 }
2517
2518 rfds = new(int, rn_fds);
2519 if (!rfds)
2520 return -ENOMEM;
2521
2522 k = 0;
2523 LIST_FOREACH(port, p, s->ports)
2524 if (p->fd >= 0)
2525 rfds[k++] = p->fd;
2526
2527 assert(k == rn_fds);
2528
2529 *fds = rfds;
2530 *n_fds = rn_fds;
2531
2532 return 0;
2533 }
2534
2535 static void socket_reset_failed(Unit *u) {
2536 Socket *s = SOCKET(u);
2537
2538 assert(s);
2539
2540 if (s->state == SOCKET_FAILED)
2541 socket_set_state(s, SOCKET_DEAD);
2542
2543 s->result = SOCKET_SUCCESS;
2544 }
2545
2546 static void socket_notify_service_dead(Socket *s, bool failed_permanent) {
2547 assert(s);
2548
2549 /* The service is dead. Dang!
2550 *
2551 * This is strictly for one-instance-for-all-connections
2552 * services. */
2553
2554 if (s->state == SOCKET_RUNNING) {
2555 log_unit_debug(UNIT(s), "Got notified about service death (failed permanently: %s)", yes_no(failed_permanent));
2556 if (failed_permanent)
2557 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_FAILED_PERMANENT);
2558 else
2559 socket_enter_listening(s);
2560 }
2561 }
2562
2563 void socket_connection_unref(Socket *s) {
2564 assert(s);
2565
2566 /* The service is dead. Yay!
2567 *
2568 * This is strictly for one-instance-per-connection
2569 * services. */
2570
2571 assert(s->n_connections > 0);
2572 s->n_connections--;
2573
2574 log_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections);
2575 }
2576
2577 static void socket_trigger_notify(Unit *u, Unit *other) {
2578 Socket *s = SOCKET(u);
2579 Service *se;
2580
2581 assert(u);
2582 assert(other);
2583
2584 /* Don't propagate state changes from the service if we are
2585 already down or accepting connections */
2586 if ((s->state != SOCKET_RUNNING &&
2587 s->state != SOCKET_LISTENING) ||
2588 s->accept)
2589 return;
2590
2591 if (other->load_state != UNIT_LOADED ||
2592 other->type != UNIT_SERVICE)
2593 return;
2594
2595 se = SERVICE(other);
2596
2597 if (se->state == SERVICE_FAILED)
2598 socket_notify_service_dead(s, se->result == SERVICE_FAILURE_START_LIMIT);
2599
2600 if (se->state == SERVICE_DEAD ||
2601 se->state == SERVICE_FINAL_SIGTERM ||
2602 se->state == SERVICE_FINAL_SIGKILL ||
2603 se->state == SERVICE_AUTO_RESTART)
2604 socket_notify_service_dead(s, false);
2605
2606 if (se->state == SERVICE_RUNNING)
2607 socket_set_state(s, SOCKET_RUNNING);
2608 }
2609
2610 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
2611 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
2612 }
2613
2614 static int socket_get_timeout(Unit *u, uint64_t *timeout) {
2615 Socket *s = SOCKET(u);
2616 int r;
2617
2618 if (!s->timer_event_source)
2619 return 0;
2620
2621 r = sd_event_source_get_time(s->timer_event_source, timeout);
2622 if (r < 0)
2623 return r;
2624
2625 return 1;
2626 }
2627
2628 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2629 [SOCKET_DEAD] = "dead",
2630 [SOCKET_START_PRE] = "start-pre",
2631 [SOCKET_START_CHOWN] = "start-chown",
2632 [SOCKET_START_POST] = "start-post",
2633 [SOCKET_LISTENING] = "listening",
2634 [SOCKET_RUNNING] = "running",
2635 [SOCKET_STOP_PRE] = "stop-pre",
2636 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2637 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2638 [SOCKET_STOP_POST] = "stop-post",
2639 [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2640 [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2641 [SOCKET_FAILED] = "failed"
2642 };
2643
2644 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2645
2646 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2647 [SOCKET_EXEC_START_PRE] = "StartPre",
2648 [SOCKET_EXEC_START_CHOWN] = "StartChown",
2649 [SOCKET_EXEC_START_POST] = "StartPost",
2650 [SOCKET_EXEC_STOP_PRE] = "StopPre",
2651 [SOCKET_EXEC_STOP_POST] = "StopPost"
2652 };
2653
2654 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2655
2656 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
2657 [SOCKET_SUCCESS] = "success",
2658 [SOCKET_FAILURE_RESOURCES] = "resources",
2659 [SOCKET_FAILURE_TIMEOUT] = "timeout",
2660 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
2661 [SOCKET_FAILURE_SIGNAL] = "signal",
2662 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
2663 [SOCKET_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent"
2664 };
2665
2666 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
2667
2668 const UnitVTable socket_vtable = {
2669 .object_size = sizeof(Socket),
2670 .exec_context_offset = offsetof(Socket, exec_context),
2671 .cgroup_context_offset = offsetof(Socket, cgroup_context),
2672 .kill_context_offset = offsetof(Socket, kill_context),
2673 .exec_runtime_offset = offsetof(Socket, exec_runtime),
2674
2675 .sections =
2676 "Unit\0"
2677 "Socket\0"
2678 "Install\0",
2679 .private_section = "Socket",
2680
2681 .init = socket_init,
2682 .done = socket_done,
2683 .load = socket_load,
2684
2685 .coldplug = socket_coldplug,
2686
2687 .dump = socket_dump,
2688
2689 .start = socket_start,
2690 .stop = socket_stop,
2691
2692 .kill = socket_kill,
2693
2694 .get_timeout = socket_get_timeout,
2695
2696 .serialize = socket_serialize,
2697 .deserialize_item = socket_deserialize_item,
2698 .distribute_fds = socket_distribute_fds,
2699
2700 .active_state = socket_active_state,
2701 .sub_state_to_string = socket_sub_state_to_string,
2702
2703 .check_gc = socket_check_gc,
2704
2705 .sigchld_event = socket_sigchld_event,
2706
2707 .trigger_notify = socket_trigger_notify,
2708
2709 .reset_failed = socket_reset_failed,
2710
2711 .bus_vtable = bus_socket_vtable,
2712 .bus_set_property = bus_socket_set_property,
2713 .bus_commit_properties = bus_socket_commit_properties,
2714
2715 .status_message_formats = {
2716 /*.starting_stopping = {
2717 [0] = "Starting socket %s...",
2718 [1] = "Stopping socket %s...",
2719 },*/
2720 .finished_start_job = {
2721 [JOB_DONE] = "Listening on %s.",
2722 [JOB_FAILED] = "Failed to listen on %s.",
2723 [JOB_TIMEOUT] = "Timed out starting %s.",
2724 },
2725 .finished_stop_job = {
2726 [JOB_DONE] = "Closed %s.",
2727 [JOB_FAILED] = "Failed stopping %s.",
2728 [JOB_TIMEOUT] = "Timed out stopping %s.",
2729 },
2730 },
2731 };
Unnamed repository; edit this file 'description' to name the repository.