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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 "socket.h"
51
52 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
53 [SOCKET_DEAD] = UNIT_INACTIVE,
54 [SOCKET_START_PRE] = UNIT_ACTIVATING,
55 [SOCKET_START_CHOWN] = UNIT_ACTIVATING,
56 [SOCKET_START_POST] = UNIT_ACTIVATING,
57 [SOCKET_LISTENING] = UNIT_ACTIVE,
58 [SOCKET_RUNNING] = UNIT_ACTIVE,
59 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
60 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
61 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
62 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
63 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
64 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
65 [SOCKET_FAILED] = UNIT_FAILED
66 };
67
68 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
69 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
70
71 static void socket_init(Unit *u) {
72 Socket *s = SOCKET(u);
73
74 assert(u);
75 assert(u->load_state == UNIT_STUB);
76
77 s->backlog = SOMAXCONN;
78 s->timeout_usec = u->manager->default_timeout_start_usec;
79 s->directory_mode = 0755;
80 s->socket_mode = 0666;
81
82 s->max_connections = 64;
83
84 s->priority = -1;
85 s->ip_tos = -1;
86 s->ip_ttl = -1;
87 s->mark = -1;
88
89 s->exec_context.std_output = u->manager->default_std_output;
90 s->exec_context.std_error = u->manager->default_std_error;
91
92 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
93 }
94
95 static void socket_unwatch_control_pid(Socket *s) {
96 assert(s);
97
98 if (s->control_pid <= 0)
99 return;
100
101 unit_unwatch_pid(UNIT(s), s->control_pid);
102 s->control_pid = 0;
103 }
104
105 void socket_free_ports(Socket *s) {
106 SocketPort *p;
107
108 assert(s);
109
110 while ((p = s->ports)) {
111 LIST_REMOVE(port, s->ports, p);
112
113 sd_event_source_unref(p->event_source);
114
115 safe_close(p->fd);
116 free(p->path);
117 free(p);
118 }
119 }
120
121 static void socket_done(Unit *u) {
122 Socket *s = SOCKET(u);
123
124 assert(s);
125
126 socket_free_ports(s);
127
128 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
129 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
130 s->control_command = NULL;
131
132 socket_unwatch_control_pid(s);
133
134 unit_ref_unset(&s->service);
135
136 free(s->tcp_congestion);
137 s->tcp_congestion = NULL;
138
139 free(s->bind_to_device);
140 s->bind_to_device = NULL;
141
142 free(s->smack);
143 free(s->smack_ip_in);
144 free(s->smack_ip_out);
145
146 strv_free(s->symlinks);
147
148 free(s->user);
149 free(s->group);
150
151 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
152 }
153
154 static int socket_arm_timer(Socket *s) {
155 int r;
156
157 assert(s);
158
159 if (s->timeout_usec <= 0) {
160 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
161 return 0;
162 }
163
164 if (s->timer_event_source) {
165 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
166 if (r < 0)
167 return r;
168
169 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
170 }
171
172 return sd_event_add_time(
173 UNIT(s)->manager->event,
174 &s->timer_event_source,
175 CLOCK_MONOTONIC,
176 now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
177 socket_dispatch_timer, s);
178 }
179
180 int socket_instantiate_service(Socket *s) {
181 _cleanup_free_ char *prefix = NULL, *name = NULL;
182 int r;
183 Unit *u;
184
185 assert(s);
186
187 /* This fills in s->service if it isn't filled in yet. For
188 * Accept=yes sockets we create the next connection service
189 * here. For Accept=no this is mostly a NOP since the service
190 * is figured out at load time anyway. */
191
192 if (UNIT_DEREF(s->service) || !s->accept)
193 return 0;
194
195 prefix = unit_name_to_prefix(UNIT(s)->id);
196 if (!prefix)
197 return -ENOMEM;
198
199 if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
200 return -ENOMEM;
201
202 r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
203 if (r < 0)
204 return r;
205
206 u->no_gc = true;
207 unit_ref_set(&s->service, u);
208
209 return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
210 }
211
212 static bool have_non_accept_socket(Socket *s) {
213 SocketPort *p;
214
215 assert(s);
216
217 if (!s->accept)
218 return true;
219
220 LIST_FOREACH(port, p, s->ports) {
221
222 if (p->type != SOCKET_SOCKET)
223 return true;
224
225 if (!socket_address_can_accept(&p->address))
226 return true;
227 }
228
229 return false;
230 }
231
232 static int socket_add_mount_links(Socket *s) {
233 SocketPort *p;
234 int r;
235
236 assert(s);
237
238 LIST_FOREACH(port, p, s->ports) {
239 const char *path = NULL;
240
241 if (p->type == SOCKET_SOCKET)
242 path = socket_address_get_path(&p->address);
243 else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL)
244 path = p->path;
245
246 if (!path)
247 continue;
248
249 r = unit_require_mounts_for(UNIT(s), path);
250 if (r < 0)
251 return r;
252 }
253
254 return 0;
255 }
256
257 static int socket_add_device_link(Socket *s) {
258 char *t;
259
260 assert(s);
261
262 if (!s->bind_to_device || streq(s->bind_to_device, "lo"))
263 return 0;
264
265 t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device);
266 return unit_add_node_link(UNIT(s), t, false);
267 }
268
269 static int socket_add_default_dependencies(Socket *s) {
270 int r;
271 assert(s);
272
273 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true);
274 if (r < 0)
275 return r;
276
277 if (UNIT(s)->manager->running_as == SYSTEMD_SYSTEM) {
278 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
279 if (r < 0)
280 return r;
281 }
282
283 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
284 }
285
286 _pure_ static bool socket_has_exec(Socket *s) {
287 unsigned i;
288 assert(s);
289
290 for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
291 if (s->exec_command[i])
292 return true;
293
294 return false;
295 }
296
297 static int socket_add_extras(Socket *s) {
298 Unit *u = UNIT(s);
299 int r;
300
301 assert(s);
302
303 if (have_non_accept_socket(s)) {
304
305 if (!UNIT_DEREF(s->service)) {
306 Unit *x;
307
308 r = unit_load_related_unit(u, ".service", &x);
309 if (r < 0)
310 return r;
311
312 unit_ref_set(&s->service, x);
313 }
314
315 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
316 if (r < 0)
317 return r;
318 }
319
320 r = socket_add_mount_links(s);
321 if (r < 0)
322 return r;
323
324 r = socket_add_device_link(s);
325 if (r < 0)
326 return r;
327
328 r = unit_patch_contexts(u);
329 if (r < 0)
330 return r;
331
332 if (socket_has_exec(s)) {
333 r = unit_add_exec_dependencies(u, &s->exec_context);
334 if (r < 0)
335 return r;
336
337 r = unit_add_default_slice(u, &s->cgroup_context);
338 if (r < 0)
339 return r;
340 }
341
342 if (u->default_dependencies) {
343 r = socket_add_default_dependencies(s);
344 if (r < 0)
345 return r;
346 }
347
348 return 0;
349 }
350
351 static const char *socket_find_symlink_target(Socket *s) {
352 const char *found = NULL;
353 SocketPort *p;
354
355 LIST_FOREACH(port, p, s->ports) {
356 const char *f = NULL;
357
358 switch (p->type) {
359
360 case SOCKET_FIFO:
361 f = p->path;
362 break;
363
364 case SOCKET_SOCKET:
365 if (p->address.sockaddr.un.sun_path[0] != 0)
366 f = p->address.sockaddr.un.sun_path;
367 break;
368
369 default:
370 break;
371 }
372
373 if (f) {
374 if (found)
375 return NULL;
376
377 found = f;
378 }
379 }
380
381 return found;
382 }
383
384 static int socket_verify(Socket *s) {
385 assert(s);
386
387 if (UNIT(s)->load_state != UNIT_LOADED)
388 return 0;
389
390 if (!s->ports) {
391 log_unit_error(UNIT(s)->id, "%s lacks Listen setting. Refusing.", UNIT(s)->id);
392 return -EINVAL;
393 }
394
395 if (s->accept && have_non_accept_socket(s)) {
396 log_unit_error(UNIT(s)->id, "%s configured for accepting sockets, but sockets are non-accepting. Refusing.",
397 UNIT(s)->id);
398 return -EINVAL;
399 }
400
401 if (s->accept && s->max_connections <= 0) {
402 log_unit_error(UNIT(s)->id, "%s's MaxConnection setting too small. Refusing.", UNIT(s)->id);
403 return -EINVAL;
404 }
405
406 if (s->accept && UNIT_DEREF(s->service)) {
407 log_unit_error(UNIT(s)->id, "Explicit service configuration for accepting sockets not supported on %s. Refusing.", UNIT(s)->id);
408 return -EINVAL;
409 }
410
411 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
412 log_unit_error(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id);
413 return -EINVAL;
414 }
415
416 if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) {
417 log_unit_error(UNIT(s)->id, "%s has symlinks set but none or more than one node in the file system. Refusing.", UNIT(s)->id);
418 return -EINVAL;
419 }
420
421 return 0;
422 }
423
424 static int socket_load(Unit *u) {
425 Socket *s = SOCKET(u);
426 int r;
427
428 assert(u);
429 assert(u->load_state == UNIT_STUB);
430
431 r = unit_load_fragment_and_dropin(u);
432 if (r < 0)
433 return r;
434
435 if (u->load_state == UNIT_LOADED) {
436 /* This is a new unit? Then let's add in some extras */
437 r = socket_add_extras(s);
438 if (r < 0)
439 return r;
440 }
441
442 return socket_verify(s);
443 }
444
445 _const_ static const char* listen_lookup(int family, int type) {
446
447 if (family == AF_NETLINK)
448 return "ListenNetlink";
449
450 if (type == SOCK_STREAM)
451 return "ListenStream";
452 else if (type == SOCK_DGRAM)
453 return "ListenDatagram";
454 else if (type == SOCK_SEQPACKET)
455 return "ListenSequentialPacket";
456
457 assert_not_reached("Unknown socket type");
458 return NULL;
459 }
460
461 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
462 char time_string[FORMAT_TIMESPAN_MAX];
463 SocketExecCommand c;
464 Socket *s = SOCKET(u);
465 SocketPort *p;
466 const char *prefix2;
467
468 assert(s);
469 assert(f);
470
471 prefix = strempty(prefix);
472 prefix2 = strjoina(prefix, "\t");
473
474 fprintf(f,
475 "%sSocket State: %s\n"
476 "%sResult: %s\n"
477 "%sBindIPv6Only: %s\n"
478 "%sBacklog: %u\n"
479 "%sSocketMode: %04o\n"
480 "%sDirectoryMode: %04o\n"
481 "%sKeepAlive: %s\n"
482 "%sNoDelay: %s\n"
483 "%sFreeBind: %s\n"
484 "%sTransparent: %s\n"
485 "%sBroadcast: %s\n"
486 "%sPassCredentials: %s\n"
487 "%sPassSecurity: %s\n"
488 "%sTCPCongestion: %s\n"
489 "%sRemoveOnStop: %s\n"
490 "%sSELinuxContextFromNet: %s\n",
491 prefix, socket_state_to_string(s->state),
492 prefix, socket_result_to_string(s->result),
493 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
494 prefix, s->backlog,
495 prefix, s->socket_mode,
496 prefix, s->directory_mode,
497 prefix, yes_no(s->keep_alive),
498 prefix, yes_no(s->no_delay),
499 prefix, yes_no(s->free_bind),
500 prefix, yes_no(s->transparent),
501 prefix, yes_no(s->broadcast),
502 prefix, yes_no(s->pass_cred),
503 prefix, yes_no(s->pass_sec),
504 prefix, strna(s->tcp_congestion),
505 prefix, yes_no(s->remove_on_stop),
506 prefix, yes_no(s->selinux_context_from_net));
507
508 if (s->control_pid > 0)
509 fprintf(f,
510 "%sControl PID: "PID_FMT"\n",
511 prefix, s->control_pid);
512
513 if (s->bind_to_device)
514 fprintf(f,
515 "%sBindToDevice: %s\n",
516 prefix, s->bind_to_device);
517
518 if (s->accept)
519 fprintf(f,
520 "%sAccepted: %u\n"
521 "%sNConnections: %u\n"
522 "%sMaxConnections: %u\n",
523 prefix, s->n_accepted,
524 prefix, s->n_connections,
525 prefix, s->max_connections);
526
527 if (s->priority >= 0)
528 fprintf(f,
529 "%sPriority: %i\n",
530 prefix, s->priority);
531
532 if (s->receive_buffer > 0)
533 fprintf(f,
534 "%sReceiveBuffer: %zu\n",
535 prefix, s->receive_buffer);
536
537 if (s->send_buffer > 0)
538 fprintf(f,
539 "%sSendBuffer: %zu\n",
540 prefix, s->send_buffer);
541
542 if (s->ip_tos >= 0)
543 fprintf(f,
544 "%sIPTOS: %i\n",
545 prefix, s->ip_tos);
546
547 if (s->ip_ttl >= 0)
548 fprintf(f,
549 "%sIPTTL: %i\n",
550 prefix, s->ip_ttl);
551
552 if (s->pipe_size > 0)
553 fprintf(f,
554 "%sPipeSize: %zu\n",
555 prefix, s->pipe_size);
556
557 if (s->mark >= 0)
558 fprintf(f,
559 "%sMark: %i\n",
560 prefix, s->mark);
561
562 if (s->mq_maxmsg > 0)
563 fprintf(f,
564 "%sMessageQueueMaxMessages: %li\n",
565 prefix, s->mq_maxmsg);
566
567 if (s->mq_msgsize > 0)
568 fprintf(f,
569 "%sMessageQueueMessageSize: %li\n",
570 prefix, s->mq_msgsize);
571
572 if (s->reuse_port)
573 fprintf(f,
574 "%sReusePort: %s\n",
575 prefix, yes_no(s->reuse_port));
576
577 if (s->smack)
578 fprintf(f,
579 "%sSmackLabel: %s\n",
580 prefix, s->smack);
581
582 if (s->smack_ip_in)
583 fprintf(f,
584 "%sSmackLabelIPIn: %s\n",
585 prefix, s->smack_ip_in);
586
587 if (s->smack_ip_out)
588 fprintf(f,
589 "%sSmackLabelIPOut: %s\n",
590 prefix, s->smack_ip_out);
591
592 if (!isempty(s->user) || !isempty(s->group))
593 fprintf(f,
594 "%sOwnerUser: %s\n"
595 "%sOwnerGroup: %s\n",
596 prefix, strna(s->user),
597 prefix, strna(s->group));
598
599 if (s->keep_alive_time > 0)
600 fprintf(f,
601 "%sKeepAliveTimeSec: %s\n",
602 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC));
603
604 if (s->keep_alive_interval)
605 fprintf(f,
606 "%sKeepAliveIntervalSec: %s\n",
607 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC));
608
609 if (s->keep_alive_cnt)
610 fprintf(f,
611 "%sKeepAliveProbes: %u\n",
612 prefix, s->keep_alive_cnt);
613
614 if (s->defer_accept)
615 fprintf(f,
616 "%sDeferAcceptSec: %s\n",
617 prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC));
618
619 LIST_FOREACH(port, p, s->ports) {
620
621 if (p->type == SOCKET_SOCKET) {
622 const char *t;
623 int r;
624 char *k = NULL;
625
626 if ((r = socket_address_print(&p->address, &k)) < 0)
627 t = strerror(-r);
628 else
629 t = k;
630
631 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
632 free(k);
633 } else if (p->type == SOCKET_SPECIAL)
634 fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
635 else if (p->type == SOCKET_MQUEUE)
636 fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
637 else
638 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
639 }
640
641 exec_context_dump(&s->exec_context, f, prefix);
642 kill_context_dump(&s->kill_context, f, prefix);
643
644 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
645 if (!s->exec_command[c])
646 continue;
647
648 fprintf(f, "%s-> %s:\n",
649 prefix, socket_exec_command_to_string(c));
650
651 exec_command_dump_list(s->exec_command[c], f, prefix2);
652 }
653 }
654
655 static int instance_from_socket(int fd, unsigned nr, char **instance) {
656 socklen_t l;
657 char *r;
658 union sockaddr_union local, remote;
659
660 assert(fd >= 0);
661 assert(instance);
662
663 l = sizeof(local);
664 if (getsockname(fd, &local.sa, &l) < 0)
665 return -errno;
666
667 l = sizeof(remote);
668 if (getpeername(fd, &remote.sa, &l) < 0)
669 return -errno;
670
671 switch (local.sa.sa_family) {
672
673 case AF_INET: {
674 uint32_t
675 a = ntohl(local.in.sin_addr.s_addr),
676 b = ntohl(remote.in.sin_addr.s_addr);
677
678 if (asprintf(&r,
679 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
680 nr,
681 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
682 ntohs(local.in.sin_port),
683 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
684 ntohs(remote.in.sin_port)) < 0)
685 return -ENOMEM;
686
687 break;
688 }
689
690 case AF_INET6: {
691 static const unsigned char ipv4_prefix[] = {
692 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
693 };
694
695 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
696 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
697 const uint8_t
698 *a = local.in6.sin6_addr.s6_addr+12,
699 *b = remote.in6.sin6_addr.s6_addr+12;
700
701 if (asprintf(&r,
702 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
703 nr,
704 a[0], a[1], a[2], a[3],
705 ntohs(local.in6.sin6_port),
706 b[0], b[1], b[2], b[3],
707 ntohs(remote.in6.sin6_port)) < 0)
708 return -ENOMEM;
709 } else {
710 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
711
712 if (asprintf(&r,
713 "%u-%s:%u-%s:%u",
714 nr,
715 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
716 ntohs(local.in6.sin6_port),
717 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
718 ntohs(remote.in6.sin6_port)) < 0)
719 return -ENOMEM;
720 }
721
722 break;
723 }
724
725 case AF_UNIX: {
726 struct ucred ucred;
727 int k;
728
729 k = getpeercred(fd, &ucred);
730 if (k >= 0) {
731 if (asprintf(&r,
732 "%u-"PID_FMT"-"UID_FMT,
733 nr, ucred.pid, ucred.uid) < 0)
734 return -ENOMEM;
735 } else if (k == -ENODATA) {
736 /* This handles the case where somebody is
737 * connecting from another pid/uid namespace
738 * (e.g. from outside of our container). */
739 if (asprintf(&r,
740 "%u-unknown",
741 nr) < 0)
742 return -ENOMEM;
743 } else
744 return k;
745
746 break;
747 }
748
749 default:
750 assert_not_reached("Unhandled socket type.");
751 }
752
753 *instance = r;
754 return 0;
755 }
756
757 static void socket_close_fds(Socket *s) {
758 SocketPort *p;
759 char **i;
760
761 assert(s);
762
763 LIST_FOREACH(port, p, s->ports) {
764
765 p->event_source = sd_event_source_unref(p->event_source);
766
767 if (p->fd < 0)
768 continue;
769
770 p->fd = safe_close(p->fd);
771
772 /* One little note: we should normally not delete any
773 * sockets in the file system here! After all some
774 * other process we spawned might still have a
775 * reference of this fd and wants to continue to use
776 * it. Therefore we delete sockets in the file system
777 * before we create a new one, not after we stopped
778 * using one! */
779
780 if (s->remove_on_stop) {
781 switch (p->type) {
782
783 case SOCKET_FIFO:
784 unlink(p->path);
785 break;
786
787 case SOCKET_MQUEUE:
788 mq_unlink(p->path);
789 break;
790
791 case SOCKET_SOCKET:
792 socket_address_unlink(&p->address);
793 break;
794
795 default:
796 break;
797 }
798 }
799 }
800
801 if (s->remove_on_stop)
802 STRV_FOREACH(i, s->symlinks)
803 unlink(*i);
804 }
805
806 static void socket_apply_socket_options(Socket *s, int fd) {
807 int r;
808
809 assert(s);
810 assert(fd >= 0);
811
812 if (s->keep_alive) {
813 int b = s->keep_alive;
814 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
815 log_unit_warning(UNIT(s)->id, "SO_KEEPALIVE failed: %m");
816 }
817
818 if (s->keep_alive_time) {
819 int value = s->keep_alive_time / USEC_PER_SEC;
820 if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
821 log_unit_warning(UNIT(s)->id, "TCP_KEEPIDLE failed: %m");
822 }
823
824 if (s->keep_alive_interval) {
825 int value = s->keep_alive_interval / USEC_PER_SEC;
826 if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
827 log_unit_warning(UNIT(s)->id, "TCP_KEEPINTVL failed: %m");
828 }
829
830 if (s->keep_alive_cnt) {
831 int value = s->keep_alive_cnt;
832 if (setsockopt(fd, SOL_SOCKET, TCP_KEEPCNT, &value, sizeof(value)) < 0)
833 log_unit_warning(UNIT(s)->id, "TCP_KEEPCNT failed: %m");
834 }
835
836 if (s->defer_accept) {
837 int value = s->defer_accept / USEC_PER_SEC;
838 if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0)
839 log_unit_warning(UNIT(s)->id, "TCP_DEFER_ACCEPT failed: %m");
840 }
841
842 if (s->no_delay) {
843 int b = s->no_delay;
844 if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
845 log_unit_warning(UNIT(s)->id, "TCP_NODELAY failed: %m");
846 }
847
848 if (s->broadcast) {
849 int one = 1;
850 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
851 log_unit_warning(UNIT(s)->id, "SO_BROADCAST failed: %m");
852 }
853
854 if (s->pass_cred) {
855 int one = 1;
856 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
857 log_unit_warning(UNIT(s)->id, "SO_PASSCRED failed: %m");
858 }
859
860 if (s->pass_sec) {
861 int one = 1;
862 if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
863 log_unit_warning(UNIT(s)->id, "SO_PASSSEC failed: %m");
864 }
865
866 if (s->priority >= 0)
867 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
868 log_unit_warning(UNIT(s)->id, "SO_PRIORITY failed: %m");
869
870 if (s->receive_buffer > 0) {
871 int value = (int) s->receive_buffer;
872
873 /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
874
875 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
876 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
877 log_unit_warning(UNIT(s)->id, "SO_RCVBUF failed: %m");
878 }
879
880 if (s->send_buffer > 0) {
881 int value = (int) s->send_buffer;
882 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
883 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
884 log_unit_warning(UNIT(s)->id, "SO_SNDBUF failed: %m");
885 }
886
887 if (s->mark >= 0)
888 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
889 log_unit_warning(UNIT(s)->id, "SO_MARK failed: %m");
890
891 if (s->ip_tos >= 0)
892 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
893 log_unit_warning(UNIT(s)->id, "IP_TOS failed: %m");
894
895 if (s->ip_ttl >= 0) {
896 int x;
897
898 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
899
900 if (socket_ipv6_is_supported())
901 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
902 else {
903 x = -1;
904 errno = EAFNOSUPPORT;
905 }
906
907 if (r < 0 && x < 0)
908 log_unit_warning(UNIT(s)->id,
909 "IP_TTL/IPV6_UNICAST_HOPS failed: %m");
910 }
911
912 if (s->tcp_congestion)
913 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
914 log_unit_warning(UNIT(s)->id, "TCP_CONGESTION failed: %m");
915
916 if (s->reuse_port) {
917 int b = s->reuse_port;
918 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &b, sizeof(b)) < 0)
919 log_unit_warning(UNIT(s)->id, "SO_REUSEPORT failed: %m");
920 }
921
922 if (s->smack_ip_in) {
923 r = mac_smack_apply_ip_in_fd(fd, s->smack_ip_in);
924 if (r < 0)
925 log_unit_error_errno(UNIT(s)->id, r, "mac_smack_apply_ip_in_fd: %m");
926 }
927
928 if (s->smack_ip_out) {
929 r = mac_smack_apply_ip_out_fd(fd, s->smack_ip_out);
930 if (r < 0)
931 log_unit_error_errno(UNIT(s)->id, 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(UNIT(s)->id, "F_SETPIPE_SZ: %m");
944
945 if (s->smack) {
946 r = mac_smack_apply_fd(fd, s->smack);
947 if (r < 0)
948 log_unit_error_errno(UNIT(s)->id, 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 if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
986 r = -errno;
987 goto fail;
988 }
989
990 mac_selinux_create_file_clear();
991
992 if (fstat(fd, &st) < 0) {
993 r = -errno;
994 goto fail;
995 }
996
997 if (!S_ISFIFO(st.st_mode) ||
998 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
999 st.st_uid != getuid() ||
1000 st.st_gid != getgid()) {
1001
1002 r = -EEXIST;
1003 goto fail;
1004 }
1005
1006 *_fd = fd;
1007 return 0;
1008
1009 fail:
1010 mac_selinux_create_file_clear();
1011 safe_close(fd);
1012
1013 return r;
1014 }
1015
1016 static int special_address_create(
1017 const char *path,
1018 int *_fd) {
1019
1020 int fd = -1, r = 0;
1021 struct stat st;
1022
1023 assert(path);
1024 assert(_fd);
1025
1026 fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
1027 if (fd < 0) {
1028 r = -errno;
1029 goto fail;
1030 }
1031
1032 if (fstat(fd, &st) < 0) {
1033 r = -errno;
1034 goto fail;
1035 }
1036
1037 /* Check whether this is a /proc, /sys or /dev file or char device */
1038 if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
1039 r = -EEXIST;
1040 goto fail;
1041 }
1042
1043 *_fd = fd;
1044 return 0;
1045
1046 fail:
1047 safe_close(fd);
1048
1049 return r;
1050 }
1051
1052 static int mq_address_create(
1053 const char *path,
1054 mode_t mq_mode,
1055 long maxmsg,
1056 long msgsize,
1057 int *_fd) {
1058
1059 int fd = -1, r = 0;
1060 struct stat st;
1061 mode_t old_mask;
1062 struct mq_attr _attr, *attr = NULL;
1063
1064 assert(path);
1065 assert(_fd);
1066
1067 if (maxmsg > 0 && msgsize > 0) {
1068 zero(_attr);
1069 _attr.mq_flags = O_NONBLOCK;
1070 _attr.mq_maxmsg = maxmsg;
1071 _attr.mq_msgsize = msgsize;
1072 attr = &_attr;
1073 }
1074
1075 /* Enforce the right access mode for the mq */
1076 old_mask = umask(~ mq_mode);
1077
1078 /* Include the original umask in our mask */
1079 umask(~mq_mode | old_mask);
1080 fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
1081 umask(old_mask);
1082
1083 if (fd < 0) {
1084 r = -errno;
1085 goto fail;
1086 }
1087
1088 if (fstat(fd, &st) < 0) {
1089 r = -errno;
1090 goto fail;
1091 }
1092
1093 if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
1094 st.st_uid != getuid() ||
1095 st.st_gid != getgid()) {
1096
1097 r = -EEXIST;
1098 goto fail;
1099 }
1100
1101 *_fd = fd;
1102 return 0;
1103
1104 fail:
1105 safe_close(fd);
1106 return r;
1107 }
1108
1109 static int socket_symlink(Socket *s) {
1110 const char *p;
1111 char **i;
1112
1113 assert(s);
1114
1115 p = socket_find_symlink_target(s);
1116 if (!p)
1117 return 0;
1118
1119 STRV_FOREACH(i, s->symlinks)
1120 symlink_label(p, *i);
1121
1122 return 0;
1123 }
1124
1125 static int socket_open_fds(Socket *s) {
1126 SocketPort *p;
1127 int r;
1128 char *label = NULL;
1129 bool know_label = false;
1130
1131 assert(s);
1132
1133 LIST_FOREACH(port, p, s->ports) {
1134
1135 if (p->fd >= 0)
1136 continue;
1137
1138 if (p->type == SOCKET_SOCKET) {
1139
1140 if (!know_label) {
1141 /* Figure out label, if we don't it know
1142 * yet. We do it once, for the first
1143 * socket where we need this and
1144 * remember it for the rest. */
1145
1146 if (s->selinux_context_from_net) {
1147 /* Get it from the network label */
1148
1149 r = mac_selinux_get_our_label(&label);
1150 if (r < 0 && r != -EOPNOTSUPP)
1151 goto rollback;
1152
1153 } else {
1154 /* Get it from the executable we are about to start */
1155
1156 r = socket_instantiate_service(s);
1157 if (r < 0)
1158 goto rollback;
1159
1160 if (UNIT_ISSET(s->service) &&
1161 SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
1162 r = mac_selinux_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
1163 if (r < 0 && r != -EPERM && r != -EOPNOTSUPP)
1164 goto rollback;
1165 }
1166 }
1167
1168 know_label = true;
1169 }
1170
1171 r = socket_address_listen(
1172 &p->address,
1173 SOCK_CLOEXEC|SOCK_NONBLOCK,
1174 s->backlog,
1175 s->bind_ipv6_only,
1176 s->bind_to_device,
1177 s->free_bind,
1178 s->transparent,
1179 s->directory_mode,
1180 s->socket_mode,
1181 label);
1182 if (r < 0)
1183 goto rollback;
1184
1185 p->fd = r;
1186 socket_apply_socket_options(s, p->fd);
1187 socket_symlink(s);
1188
1189 } else if (p->type == SOCKET_SPECIAL) {
1190
1191 r = special_address_create(
1192 p->path,
1193 &p->fd);
1194 if (r < 0)
1195 goto rollback;
1196
1197 } else if (p->type == SOCKET_FIFO) {
1198
1199 r = fifo_address_create(
1200 p->path,
1201 s->directory_mode,
1202 s->socket_mode,
1203 &p->fd);
1204 if (r < 0)
1205 goto rollback;
1206
1207 socket_apply_fifo_options(s, p->fd);
1208 socket_symlink(s);
1209
1210 } else if (p->type == SOCKET_MQUEUE) {
1211
1212 r = mq_address_create(
1213 p->path,
1214 s->socket_mode,
1215 s->mq_maxmsg,
1216 s->mq_msgsize,
1217 &p->fd);
1218 if (r < 0)
1219 goto rollback;
1220 } else
1221 assert_not_reached("Unknown port type");
1222 }
1223
1224 mac_selinux_free(label);
1225 return 0;
1226
1227 rollback:
1228 socket_close_fds(s);
1229 mac_selinux_free(label);
1230
1231 return r;
1232 }
1233
1234 static void socket_unwatch_fds(Socket *s) {
1235 SocketPort *p;
1236 int r;
1237
1238 assert(s);
1239
1240 LIST_FOREACH(port, p, s->ports) {
1241 if (p->fd < 0)
1242 continue;
1243
1244 if (!p->event_source)
1245 continue;
1246
1247 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF);
1248 if (r < 0)
1249 log_unit_debug(UNIT(s)->id, "Failed to disable event source.");
1250 }
1251 }
1252
1253 static int socket_watch_fds(Socket *s) {
1254 SocketPort *p;
1255 int r;
1256
1257 assert(s);
1258
1259 LIST_FOREACH(port, p, s->ports) {
1260 if (p->fd < 0)
1261 continue;
1262
1263 if (p->event_source)
1264 r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
1265 else
1266 r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
1267
1268 if (r < 0) {
1269 log_unit_warning_errno(UNIT(s)->id, r, "Failed to watch listening fds: %m");
1270 goto fail;
1271 }
1272 }
1273
1274 return 0;
1275
1276 fail:
1277 socket_unwatch_fds(s);
1278 return r;
1279 }
1280
1281 static void socket_set_state(Socket *s, SocketState state) {
1282 SocketState old_state;
1283 assert(s);
1284
1285 old_state = s->state;
1286 s->state = state;
1287
1288 if (!IN_SET(state,
1289 SOCKET_START_PRE,
1290 SOCKET_START_CHOWN,
1291 SOCKET_START_POST,
1292 SOCKET_STOP_PRE,
1293 SOCKET_STOP_PRE_SIGTERM,
1294 SOCKET_STOP_PRE_SIGKILL,
1295 SOCKET_STOP_POST,
1296 SOCKET_FINAL_SIGTERM,
1297 SOCKET_FINAL_SIGKILL)) {
1298
1299 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1300 socket_unwatch_control_pid(s);
1301 s->control_command = NULL;
1302 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1303 }
1304
1305 if (state != SOCKET_LISTENING)
1306 socket_unwatch_fds(s);
1307
1308 if (!IN_SET(state,
1309 SOCKET_START_CHOWN,
1310 SOCKET_START_POST,
1311 SOCKET_LISTENING,
1312 SOCKET_RUNNING,
1313 SOCKET_STOP_PRE,
1314 SOCKET_STOP_PRE_SIGTERM,
1315 SOCKET_STOP_PRE_SIGKILL))
1316 socket_close_fds(s);
1317
1318 if (state != old_state)
1319 log_unit_debug(UNIT(s)->id, "%s changed %s -> %s",
1320 UNIT(s)->id, socket_state_to_string(old_state), socket_state_to_string(state));
1321
1322 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
1323 }
1324
1325 static int socket_coldplug(Unit *u) {
1326 Socket *s = SOCKET(u);
1327 int r;
1328
1329 assert(s);
1330 assert(s->state == SOCKET_DEAD);
1331
1332 if (s->deserialized_state == s->state)
1333 return 0;
1334
1335 if (IN_SET(s->deserialized_state,
1336 SOCKET_START_PRE,
1337 SOCKET_START_CHOWN,
1338 SOCKET_START_POST,
1339 SOCKET_STOP_PRE,
1340 SOCKET_STOP_PRE_SIGTERM,
1341 SOCKET_STOP_PRE_SIGKILL,
1342 SOCKET_STOP_POST,
1343 SOCKET_FINAL_SIGTERM,
1344 SOCKET_FINAL_SIGKILL)) {
1345
1346 if (s->control_pid <= 0)
1347 return -EBADMSG;
1348
1349 r = unit_watch_pid(UNIT(s), s->control_pid);
1350 if (r < 0)
1351 return r;
1352
1353 r = socket_arm_timer(s);
1354 if (r < 0)
1355 return r;
1356 }
1357
1358 if (IN_SET(s->deserialized_state,
1359 SOCKET_START_CHOWN,
1360 SOCKET_START_POST,
1361 SOCKET_LISTENING,
1362 SOCKET_RUNNING,
1363 SOCKET_STOP_PRE,
1364 SOCKET_STOP_PRE_SIGTERM,
1365 SOCKET_STOP_PRE_SIGKILL)) {
1366 r = socket_open_fds(s);
1367 if (r < 0)
1368 return r;
1369 }
1370
1371 if (s->deserialized_state == SOCKET_LISTENING) {
1372 r = socket_watch_fds(s);
1373 if (r < 0)
1374 return r;
1375 }
1376
1377 socket_set_state(s, s->deserialized_state);
1378 return 0;
1379 }
1380
1381 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
1382 _cleanup_free_ char **argv = NULL;
1383 pid_t pid;
1384 int r;
1385 ExecParameters exec_params = {
1386 .apply_permissions = true,
1387 .apply_chroot = true,
1388 .apply_tty_stdin = true,
1389 };
1390
1391 assert(s);
1392 assert(c);
1393 assert(_pid);
1394
1395 unit_realize_cgroup(UNIT(s));
1396
1397 r = unit_setup_exec_runtime(UNIT(s));
1398 if (r < 0)
1399 goto fail;
1400
1401 r = socket_arm_timer(s);
1402 if (r < 0)
1403 goto fail;
1404
1405 r = unit_full_printf_strv(UNIT(s), c->argv, &argv);
1406 if (r < 0)
1407 goto fail;
1408
1409 exec_params.argv = argv;
1410 exec_params.environment = UNIT(s)->manager->environment;
1411 exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
1412 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
1413 exec_params.cgroup_path = UNIT(s)->cgroup_path;
1414 exec_params.cgroup_delegate = s->cgroup_context.delegate;
1415 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
1416 exec_params.unit_id = UNIT(s)->id;
1417
1418 r = exec_spawn(c,
1419 &s->exec_context,
1420 &exec_params,
1421 s->exec_runtime,
1422 &pid);
1423 if (r < 0)
1424 goto fail;
1425
1426 r = unit_watch_pid(UNIT(s), pid);
1427 if (r < 0)
1428 /* FIXME: we need to do something here */
1429 goto fail;
1430
1431 *_pid = pid;
1432 return 0;
1433
1434 fail:
1435 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1436 return r;
1437 }
1438
1439 static int socket_chown(Socket *s, pid_t *_pid) {
1440 pid_t pid;
1441 int r;
1442
1443 r = socket_arm_timer(s);
1444 if (r < 0)
1445 goto fail;
1446
1447 /* We have to resolve the user names out-of-process, hence
1448 * let's fork here. It's messy, but well, what can we do? */
1449
1450 pid = fork();
1451 if (pid < 0)
1452 return -errno;
1453
1454 if (pid == 0) {
1455 SocketPort *p;
1456 uid_t uid = UID_INVALID;
1457 gid_t gid = GID_INVALID;
1458 int ret;
1459
1460 default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1);
1461 ignore_signals(SIGPIPE, -1);
1462 log_forget_fds();
1463
1464 if (!isempty(s->user)) {
1465 const char *user = s->user;
1466
1467 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1468 if (r < 0) {
1469 ret = EXIT_USER;
1470 goto fail_child;
1471 }
1472 }
1473
1474 if (!isempty(s->group)) {
1475 const char *group = s->group;
1476
1477 r = get_group_creds(&group, &gid);
1478 if (r < 0) {
1479 ret = EXIT_GROUP;
1480 goto fail_child;
1481 }
1482 }
1483
1484 LIST_FOREACH(port, p, s->ports) {
1485 const char *path = NULL;
1486
1487 if (p->type == SOCKET_SOCKET)
1488 path = socket_address_get_path(&p->address);
1489 else if (p->type == SOCKET_FIFO)
1490 path = p->path;
1491
1492 if (!path)
1493 continue;
1494
1495 if (chown(path, uid, gid) < 0) {
1496 r = -errno;
1497 ret = EXIT_CHOWN;
1498 goto fail_child;
1499 }
1500 }
1501
1502 _exit(0);
1503
1504 fail_child:
1505 log_open();
1506 log_error_errno(r, "Failed to chown socket at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD));
1507
1508 _exit(ret);
1509 }
1510
1511 r = unit_watch_pid(UNIT(s), pid);
1512 if (r < 0)
1513 goto fail;
1514
1515 *_pid = pid;
1516 return 0;
1517
1518 fail:
1519 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1520 return r;
1521 }
1522
1523 static void socket_enter_dead(Socket *s, SocketResult f) {
1524 assert(s);
1525
1526 if (f != SOCKET_SUCCESS)
1527 s->result = f;
1528
1529 exec_runtime_destroy(s->exec_runtime);
1530 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1531
1532 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
1533
1534 socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
1535 }
1536
1537 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
1538
1539 static void socket_enter_stop_post(Socket *s, SocketResult f) {
1540 int r;
1541 assert(s);
1542
1543 if (f != SOCKET_SUCCESS)
1544 s->result = f;
1545
1546 socket_unwatch_control_pid(s);
1547 s->control_command_id = SOCKET_EXEC_STOP_POST;
1548 s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST];
1549
1550 if (s->control_command) {
1551 r = socket_spawn(s, s->control_command, &s->control_pid);
1552 if (r < 0)
1553 goto fail;
1554
1555 socket_set_state(s, SOCKET_STOP_POST);
1556 } else
1557 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
1558
1559 return;
1560
1561 fail:
1562 log_unit_warning(UNIT(s)->id,
1563 "%s failed to run 'stop-post' task: %s",
1564 UNIT(s)->id, strerror(-r));
1565 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1566 }
1567
1568 static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
1569 int r;
1570
1571 assert(s);
1572
1573 if (f != SOCKET_SUCCESS)
1574 s->result = f;
1575
1576 r = unit_kill_context(
1577 UNIT(s),
1578 &s->kill_context,
1579 (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ?
1580 KILL_KILL : KILL_TERMINATE,
1581 -1,
1582 s->control_pid,
1583 false);
1584 if (r < 0)
1585 goto fail;
1586
1587 if (r > 0) {
1588 r = socket_arm_timer(s);
1589 if (r < 0)
1590 goto fail;
1591
1592 socket_set_state(s, state);
1593 } else if (state == SOCKET_STOP_PRE_SIGTERM)
1594 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
1595 else if (state == SOCKET_STOP_PRE_SIGKILL)
1596 socket_enter_stop_post(s, SOCKET_SUCCESS);
1597 else if (state == SOCKET_FINAL_SIGTERM)
1598 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
1599 else
1600 socket_enter_dead(s, SOCKET_SUCCESS);
1601
1602 return;
1603
1604 fail:
1605 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);
1606
1607 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1608 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1609 else
1610 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1611 }
1612
1613 static void socket_enter_stop_pre(Socket *s, SocketResult f) {
1614 int r;
1615 assert(s);
1616
1617 if (f != SOCKET_SUCCESS)
1618 s->result = f;
1619
1620 socket_unwatch_control_pid(s);
1621 s->control_command_id = SOCKET_EXEC_STOP_PRE;
1622 s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE];
1623
1624 if (s->control_command) {
1625 r = socket_spawn(s, s->control_command, &s->control_pid);
1626 if (r < 0)
1627 goto fail;
1628
1629 socket_set_state(s, SOCKET_STOP_PRE);
1630 } else
1631 socket_enter_stop_post(s, SOCKET_SUCCESS);
1632
1633 return;
1634
1635 fail:
1636 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'stop-pre' task: %m", UNIT(s)->id);
1637 socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
1638 }
1639
1640 static void socket_enter_listening(Socket *s) {
1641 int r;
1642 assert(s);
1643
1644 r = socket_watch_fds(s);
1645 if (r < 0) {
1646 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to watch sockets: %m", UNIT(s)->id);
1647 goto fail;
1648 }
1649
1650 socket_set_state(s, SOCKET_LISTENING);
1651 return;
1652
1653 fail:
1654 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1655 }
1656
1657 static void socket_enter_start_post(Socket *s) {
1658 int r;
1659 assert(s);
1660
1661 socket_unwatch_control_pid(s);
1662 s->control_command_id = SOCKET_EXEC_START_POST;
1663 s->control_command = s->exec_command[SOCKET_EXEC_START_POST];
1664
1665 if (s->control_command) {
1666 r = socket_spawn(s, s->control_command, &s->control_pid);
1667 if (r < 0) {
1668 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'start-post' task: %m", UNIT(s)->id);
1669 goto fail;
1670 }
1671
1672 socket_set_state(s, SOCKET_START_POST);
1673 } else
1674 socket_enter_listening(s);
1675
1676 return;
1677
1678 fail:
1679 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1680 }
1681
1682 static void socket_enter_start_chown(Socket *s) {
1683 int r;
1684
1685 assert(s);
1686
1687 r = socket_open_fds(s);
1688 if (r < 0) {
1689 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to listen on sockets: %m", UNIT(s)->id);
1690 goto fail;
1691 }
1692
1693 if (!isempty(s->user) || !isempty(s->group)) {
1694
1695 socket_unwatch_control_pid(s);
1696 s->control_command_id = SOCKET_EXEC_START_CHOWN;
1697 s->control_command = NULL;
1698
1699 r = socket_chown(s, &s->control_pid);
1700 if (r < 0) {
1701 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to fork 'start-chown' task: %m", UNIT(s)->id);
1702 goto fail;
1703 }
1704
1705 socket_set_state(s, SOCKET_START_CHOWN);
1706 } else
1707 socket_enter_start_post(s);
1708
1709 return;
1710
1711 fail:
1712 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1713 }
1714
1715 static void socket_enter_start_pre(Socket *s) {
1716 int r;
1717 assert(s);
1718
1719 socket_unwatch_control_pid(s);
1720 s->control_command_id = SOCKET_EXEC_START_PRE;
1721 s->control_command = s->exec_command[SOCKET_EXEC_START_PRE];
1722
1723 if (s->control_command) {
1724 r = socket_spawn(s, s->control_command, &s->control_pid);
1725 if (r < 0) {
1726 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'start-pre' task: %m", UNIT(s)->id);
1727 goto fail;
1728 }
1729
1730 socket_set_state(s, SOCKET_START_PRE);
1731 } else
1732 socket_enter_start_chown(s);
1733
1734 return;
1735
1736 fail:
1737 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1738 }
1739
1740 static void socket_enter_running(Socket *s, int cfd) {
1741 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1742 int r;
1743
1744 assert(s);
1745
1746 /* We don't take connections anymore if we are supposed to
1747 * shut down anyway */
1748 if (unit_stop_pending(UNIT(s))) {
1749
1750 log_unit_debug(UNIT(s)->id, "Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
1751
1752 if (cfd >= 0)
1753 safe_close(cfd);
1754 else {
1755 /* Flush all sockets by closing and reopening them */
1756 socket_close_fds(s);
1757
1758 r = socket_open_fds(s);
1759 if (r < 0) {
1760 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to listen on sockets: %m", UNIT(s)->id);
1761 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1762 return;
1763 }
1764
1765 r = socket_watch_fds(s);
1766 if (r < 0) {
1767 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to watch sockets: %m", UNIT(s)->id);
1768 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1769 }
1770 }
1771
1772 return;
1773 }
1774
1775 if (cfd < 0) {
1776 Iterator i;
1777 Unit *other;
1778 bool pending = false;
1779
1780 /* If there's already a start pending don't bother to
1781 * do anything */
1782 SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
1783 if (unit_active_or_pending(other)) {
1784 pending = true;
1785 break;
1786 }
1787
1788 if (!pending) {
1789 if (!UNIT_ISSET(s->service)) {
1790 log_unit_error(UNIT(s)->id, "%s: service to activate vanished, refusing activation.", UNIT(s)->id);
1791 r = -ENOENT;
1792 goto fail;
1793 }
1794
1795 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
1796 if (r < 0)
1797 goto fail;
1798 }
1799
1800 socket_set_state(s, SOCKET_RUNNING);
1801 } else {
1802 _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL;
1803 Service *service;
1804
1805 if (s->n_connections >= s->max_connections) {
1806 log_unit_warning(UNIT(s)->id, "%s: Too many incoming connections (%u)", UNIT(s)->id, s->n_connections);
1807 safe_close(cfd);
1808 return;
1809 }
1810
1811 r = socket_instantiate_service(s);
1812 if (r < 0)
1813 goto fail;
1814
1815 r = instance_from_socket(cfd, s->n_accepted, &instance);
1816 if (r < 0) {
1817 if (r != -ENOTCONN)
1818 goto fail;
1819
1820 /* ENOTCONN is legitimate if TCP RST was received.
1821 * This connection is over, but the socket unit lives on. */
1822 safe_close(cfd);
1823 return;
1824 }
1825
1826 prefix = unit_name_to_prefix(UNIT(s)->id);
1827 if (!prefix) {
1828 r = -ENOMEM;
1829 goto fail;
1830 }
1831
1832 name = unit_name_build(prefix, instance, ".service");
1833 if (!name) {
1834 r = -ENOMEM;
1835 goto fail;
1836 }
1837
1838 r = unit_add_name(UNIT_DEREF(s->service), name);
1839 if (r < 0)
1840 goto fail;
1841
1842 service = SERVICE(UNIT_DEREF(s->service));
1843 unit_ref_unset(&s->service);
1844 s->n_accepted ++;
1845
1846 UNIT(service)->no_gc = false;
1847
1848 unit_choose_id(UNIT(service), name);
1849
1850 r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
1851 if (r < 0)
1852 goto fail;
1853
1854 cfd = -1;
1855 s->n_connections ++;
1856
1857 r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
1858 if (r < 0)
1859 goto fail;
1860
1861 /* Notify clients about changed counters */
1862 unit_add_to_dbus_queue(UNIT(s));
1863 }
1864
1865 return;
1866
1867 fail:
1868 log_unit_warning(UNIT(s)->id, "%s failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
1869 UNIT(s)->id, cfd >= 0 ? "template" : "non-template",
1870 bus_error_message(&error, r));
1871
1872 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1873 safe_close(cfd);
1874 }
1875
1876 static void socket_run_next(Socket *s) {
1877 int r;
1878
1879 assert(s);
1880 assert(s->control_command);
1881 assert(s->control_command->command_next);
1882
1883 socket_unwatch_control_pid(s);
1884
1885 s->control_command = s->control_command->command_next;
1886
1887 r = socket_spawn(s, s->control_command, &s->control_pid);
1888 if (r < 0)
1889 goto fail;
1890
1891 return;
1892
1893 fail:
1894 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run next task: %m", UNIT(s)->id);
1895
1896 if (s->state == SOCKET_START_POST)
1897 socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
1898 else if (s->state == SOCKET_STOP_POST)
1899 socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
1900 else
1901 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
1902 }
1903
1904 static int socket_start(Unit *u) {
1905 Socket *s = SOCKET(u);
1906
1907 assert(s);
1908
1909 /* We cannot fulfill this request right now, try again later
1910 * please! */
1911 if (IN_SET(s->state,
1912 SOCKET_STOP_PRE,
1913 SOCKET_STOP_PRE_SIGKILL,
1914 SOCKET_STOP_PRE_SIGTERM,
1915 SOCKET_STOP_POST,
1916 SOCKET_FINAL_SIGTERM,
1917 SOCKET_FINAL_SIGKILL))
1918 return -EAGAIN;
1919
1920 /* Already on it! */
1921 if (IN_SET(s->state,
1922 SOCKET_START_PRE,
1923 SOCKET_START_CHOWN,
1924 SOCKET_START_POST))
1925 return 0;
1926
1927 /* Cannot run this without the service being around */
1928 if (UNIT_ISSET(s->service)) {
1929 Service *service;
1930
1931 service = SERVICE(UNIT_DEREF(s->service));
1932
1933 if (UNIT(service)->load_state != UNIT_LOADED) {
1934 log_unit_error(u->id, "Socket service %s not loaded, refusing.", UNIT(service)->id);
1935 return -ENOENT;
1936 }
1937
1938 /* If the service is already active we cannot start the
1939 * socket */
1940 if (service->state != SERVICE_DEAD &&
1941 service->state != SERVICE_FAILED &&
1942 service->state != SERVICE_AUTO_RESTART) {
1943 log_unit_error(u->id, "Socket service %s already active, refusing.", UNIT(service)->id);
1944 return -EBUSY;
1945 }
1946 }
1947
1948 assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
1949
1950 s->result = SOCKET_SUCCESS;
1951 socket_enter_start_pre(s);
1952
1953 return 1;
1954 }
1955
1956 static int socket_stop(Unit *u) {
1957 Socket *s = SOCKET(u);
1958
1959 assert(s);
1960
1961 /* Already on it */
1962 if (IN_SET(s->state,
1963 SOCKET_STOP_PRE,
1964 SOCKET_STOP_PRE_SIGTERM,
1965 SOCKET_STOP_PRE_SIGKILL,
1966 SOCKET_STOP_POST,
1967 SOCKET_FINAL_SIGTERM,
1968 SOCKET_FINAL_SIGKILL))
1969 return 0;
1970
1971 /* If there's already something running we go directly into
1972 * kill mode. */
1973 if (IN_SET(s->state,
1974 SOCKET_START_PRE,
1975 SOCKET_START_CHOWN,
1976 SOCKET_START_POST)) {
1977 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
1978 return -EAGAIN;
1979 }
1980
1981 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1982
1983 socket_enter_stop_pre(s, SOCKET_SUCCESS);
1984 return 1;
1985 }
1986
1987 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1988 Socket *s = SOCKET(u);
1989 SocketPort *p;
1990 int r;
1991
1992 assert(u);
1993 assert(f);
1994 assert(fds);
1995
1996 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1997 unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
1998 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1999
2000 if (s->control_pid > 0)
2001 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
2002
2003 if (s->control_command_id >= 0)
2004 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
2005
2006 LIST_FOREACH(port, p, s->ports) {
2007 int copy;
2008
2009 if (p->fd < 0)
2010 continue;
2011
2012 copy = fdset_put_dup(fds, p->fd);
2013 if (copy < 0)
2014 return copy;
2015
2016 if (p->type == SOCKET_SOCKET) {
2017 _cleanup_free_ char *t = NULL;
2018
2019 r = socket_address_print(&p->address, &t);
2020 if (r < 0)
2021 return r;
2022
2023 if (socket_address_family(&p->address) == AF_NETLINK)
2024 unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
2025 else
2026 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
2027
2028 } else if (p->type == SOCKET_SPECIAL)
2029 unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
2030 else if (p->type == SOCKET_MQUEUE)
2031 unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
2032 else {
2033 assert(p->type == SOCKET_FIFO);
2034 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
2035 }
2036 }
2037
2038 return 0;
2039 }
2040
2041 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2042 Socket *s = SOCKET(u);
2043
2044 assert(u);
2045 assert(key);
2046 assert(value);
2047
2048 if (streq(key, "state")) {
2049 SocketState state;
2050
2051 state = socket_state_from_string(value);
2052 if (state < 0)
2053 log_unit_debug(u->id, "Failed to parse state value %s", value);
2054 else
2055 s->deserialized_state = state;
2056 } else if (streq(key, "result")) {
2057 SocketResult f;
2058
2059 f = socket_result_from_string(value);
2060 if (f < 0)
2061 log_unit_debug(u->id, "Failed to parse result value %s", value);
2062 else if (f != SOCKET_SUCCESS)
2063 s->result = f;
2064
2065 } else if (streq(key, "n-accepted")) {
2066 unsigned k;
2067
2068 if (safe_atou(value, &k) < 0)
2069 log_unit_debug(u->id, "Failed to parse n-accepted value %s", value);
2070 else
2071 s->n_accepted += k;
2072 } else if (streq(key, "control-pid")) {
2073 pid_t pid;
2074
2075 if (parse_pid(value, &pid) < 0)
2076 log_unit_debug(u->id, "Failed to parse control-pid value %s", value);
2077 else
2078 s->control_pid = pid;
2079 } else if (streq(key, "control-command")) {
2080 SocketExecCommand id;
2081
2082 id = socket_exec_command_from_string(value);
2083 if (id < 0)
2084 log_unit_debug(u->id, "Failed to parse exec-command value %s", value);
2085 else {
2086 s->control_command_id = id;
2087 s->control_command = s->exec_command[id];
2088 }
2089 } else if (streq(key, "fifo")) {
2090 int fd, skip = 0;
2091 SocketPort *p;
2092
2093 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2094 log_unit_debug(u->id, "Failed to parse fifo value %s", value);
2095 else {
2096
2097 LIST_FOREACH(port, p, s->ports)
2098 if (p->type == SOCKET_FIFO &&
2099 path_equal_or_files_same(p->path, value+skip))
2100 break;
2101
2102 if (p) {
2103 safe_close(p->fd);
2104 p->fd = fdset_remove(fds, fd);
2105 }
2106 }
2107
2108 } else if (streq(key, "special")) {
2109 int fd, skip = 0;
2110 SocketPort *p;
2111
2112 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2113 log_unit_debug(u->id, "Failed to parse special value %s", value);
2114 else {
2115
2116 LIST_FOREACH(port, p, s->ports)
2117 if (p->type == SOCKET_SPECIAL &&
2118 path_equal_or_files_same(p->path, value+skip))
2119 break;
2120
2121 if (p) {
2122 safe_close(p->fd);
2123 p->fd = fdset_remove(fds, fd);
2124 }
2125 }
2126
2127 } else if (streq(key, "mqueue")) {
2128 int fd, skip = 0;
2129 SocketPort *p;
2130
2131 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2132 log_unit_debug(u->id, "Failed to parse mqueue value %s", value);
2133 else {
2134
2135 LIST_FOREACH(port, p, s->ports)
2136 if (p->type == SOCKET_MQUEUE &&
2137 streq(p->path, value+skip))
2138 break;
2139
2140 if (p) {
2141 safe_close(p->fd);
2142 p->fd = fdset_remove(fds, fd);
2143 }
2144 }
2145
2146 } else if (streq(key, "socket")) {
2147 int fd, type, skip = 0;
2148 SocketPort *p;
2149
2150 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
2151 log_unit_debug(u->id, "Failed to parse socket value %s", value);
2152 else {
2153
2154 LIST_FOREACH(port, p, s->ports)
2155 if (socket_address_is(&p->address, value+skip, type))
2156 break;
2157
2158 if (p) {
2159 safe_close(p->fd);
2160 p->fd = fdset_remove(fds, fd);
2161 }
2162 }
2163
2164 } else if (streq(key, "netlink")) {
2165 int fd, skip = 0;
2166 SocketPort *p;
2167
2168 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
2169 log_unit_debug(u->id, "Failed to parse socket value %s", value);
2170 else {
2171
2172 LIST_FOREACH(port, p, s->ports)
2173 if (socket_address_is_netlink(&p->address, value+skip))
2174 break;
2175
2176 if (p) {
2177 safe_close(p->fd);
2178 p->fd = fdset_remove(fds, fd);
2179 }
2180 }
2181 } else
2182 log_unit_debug(UNIT(s)->id, "Unknown serialization key '%s'", key);
2183
2184 return 0;
2185 }
2186
2187 static int socket_distribute_fds(Unit *u, FDSet *fds) {
2188 Socket *s = SOCKET(u);
2189 SocketPort *p;
2190
2191 assert(u);
2192
2193 LIST_FOREACH(port, p, s->ports) {
2194 Iterator i;
2195 int fd;
2196
2197 if (p->type != SOCKET_SOCKET)
2198 continue;
2199
2200 if (p->fd >= 0)
2201 continue;
2202
2203 FDSET_FOREACH(fd, fds, i) {
2204 if (socket_address_matches_fd(&p->address, fd)) {
2205 p->fd = fdset_remove(fds, fd);
2206 s->deserialized_state = SOCKET_LISTENING;
2207 break;
2208 }
2209 }
2210 }
2211
2212 return 0;
2213 }
2214
2215 _pure_ static UnitActiveState socket_active_state(Unit *u) {
2216 assert(u);
2217
2218 return state_translation_table[SOCKET(u)->state];
2219 }
2220
2221 _pure_ static const char *socket_sub_state_to_string(Unit *u) {
2222 assert(u);
2223
2224 return socket_state_to_string(SOCKET(u)->state);
2225 }
2226
2227 const char* socket_port_type_to_string(SocketPort *p) {
2228
2229 assert(p);
2230
2231 switch (p->type) {
2232
2233 case SOCKET_SOCKET:
2234
2235 switch (p->address.type) {
2236
2237 case SOCK_STREAM:
2238 return "Stream";
2239
2240 case SOCK_DGRAM:
2241 return "Datagram";
2242
2243 case SOCK_SEQPACKET:
2244 return "SequentialPacket";
2245
2246 case SOCK_RAW:
2247 if (socket_address_family(&p->address) == AF_NETLINK)
2248 return "Netlink";
2249
2250 default:
2251 return NULL;
2252 }
2253
2254 case SOCKET_SPECIAL:
2255 return "Special";
2256
2257 case SOCKET_MQUEUE:
2258 return "MessageQueue";
2259
2260 case SOCKET_FIFO:
2261 return "FIFO";
2262
2263 default:
2264 return NULL;
2265 }
2266 }
2267
2268 _pure_ static bool socket_check_gc(Unit *u) {
2269 Socket *s = SOCKET(u);
2270
2271 assert(u);
2272
2273 return s->n_connections > 0;
2274 }
2275
2276 static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2277 SocketPort *p = userdata;
2278 int cfd = -1;
2279
2280 assert(p);
2281 assert(fd >= 0);
2282
2283 if (p->socket->state != SOCKET_LISTENING)
2284 return 0;
2285
2286 log_unit_debug(UNIT(p->socket)->id, "Incoming traffic on %s", UNIT(p->socket)->id);
2287
2288 if (revents != EPOLLIN) {
2289
2290 if (revents & EPOLLHUP)
2291 log_unit_error(UNIT(p->socket)->id, "%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.",
2292 UNIT(p->socket)->id);
2293 else
2294 log_unit_error(UNIT(p->socket)->id, "%s: Got unexpected poll event (0x%x) on socket.",
2295 UNIT(p->socket)->id, revents);
2296
2297 goto fail;
2298 }
2299
2300 if (p->socket->accept &&
2301 p->type == SOCKET_SOCKET &&
2302 socket_address_can_accept(&p->address)) {
2303
2304 for (;;) {
2305
2306 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
2307 if (cfd < 0) {
2308
2309 if (errno == EINTR)
2310 continue;
2311
2312 log_unit_error(UNIT(p->socket)->id,
2313 "Failed to accept socket: %m");
2314 goto fail;
2315 }
2316
2317 break;
2318 }
2319
2320 socket_apply_socket_options(p->socket, cfd);
2321 }
2322
2323 socket_enter_running(p->socket, cfd);
2324 return 0;
2325
2326 fail:
2327 socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES);
2328 return 0;
2329 }
2330
2331 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2332 Socket *s = SOCKET(u);
2333 SocketResult f;
2334
2335 assert(s);
2336 assert(pid >= 0);
2337
2338 if (pid != s->control_pid)
2339 return;
2340
2341 s->control_pid = 0;
2342
2343 if (is_clean_exit(code, status, NULL))
2344 f = SOCKET_SUCCESS;
2345 else if (code == CLD_EXITED)
2346 f = SOCKET_FAILURE_EXIT_CODE;
2347 else if (code == CLD_KILLED)
2348 f = SOCKET_FAILURE_SIGNAL;
2349 else if (code == CLD_DUMPED)
2350 f = SOCKET_FAILURE_CORE_DUMP;
2351 else
2352 assert_not_reached("Unknown sigchld code");
2353
2354 if (s->control_command) {
2355 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
2356
2357 if (s->control_command->ignore)
2358 f = SOCKET_SUCCESS;
2359 }
2360
2361 log_unit_full(u->id,
2362 f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
2363 "%s control process exited, code=%s status=%i",
2364 u->id, sigchld_code_to_string(code), status);
2365
2366 if (f != SOCKET_SUCCESS)
2367 s->result = f;
2368
2369 if (s->control_command &&
2370 s->control_command->command_next &&
2371 f == SOCKET_SUCCESS) {
2372
2373 log_unit_debug(u->id,
2374 "%s running next command for state %s",
2375 u->id, 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->id,
2385 "%s got final SIGCHLD for state %s",
2386 u->id, socket_state_to_string(s->state));
2387
2388 switch (s->state) {
2389
2390 case SOCKET_START_PRE:
2391 if (f == SOCKET_SUCCESS)
2392 socket_enter_start_chown(s);
2393 else
2394 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
2395 break;
2396
2397 case SOCKET_START_CHOWN:
2398 if (f == SOCKET_SUCCESS)
2399 socket_enter_start_post(s);
2400 else
2401 socket_enter_stop_pre(s, f);
2402 break;
2403
2404 case SOCKET_START_POST:
2405 if (f == SOCKET_SUCCESS)
2406 socket_enter_listening(s);
2407 else
2408 socket_enter_stop_pre(s, f);
2409 break;
2410
2411 case SOCKET_STOP_PRE:
2412 case SOCKET_STOP_PRE_SIGTERM:
2413 case SOCKET_STOP_PRE_SIGKILL:
2414 socket_enter_stop_post(s, f);
2415 break;
2416
2417 case SOCKET_STOP_POST:
2418 case SOCKET_FINAL_SIGTERM:
2419 case SOCKET_FINAL_SIGKILL:
2420 socket_enter_dead(s, f);
2421 break;
2422
2423 default:
2424 assert_not_reached("Uh, control process died at wrong time.");
2425 }
2426 }
2427
2428 /* Notify clients about changed exit status */
2429 unit_add_to_dbus_queue(u);
2430 }
2431
2432 static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
2433 Socket *s = SOCKET(userdata);
2434
2435 assert(s);
2436 assert(s->timer_event_source == source);
2437
2438 switch (s->state) {
2439
2440 case SOCKET_START_PRE:
2441 log_unit_warning(UNIT(s)->id, "%s starting timed out. Terminating.", UNIT(s)->id);
2442 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2443 break;
2444
2445 case SOCKET_START_CHOWN:
2446 case SOCKET_START_POST:
2447 log_unit_warning(UNIT(s)->id, "%s starting timed out. Stopping.", UNIT(s)->id);
2448 socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
2449 break;
2450
2451 case SOCKET_STOP_PRE:
2452 log_unit_warning(UNIT(s)->id, "%s stopping timed out. Terminating.", UNIT(s)->id);
2453 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2454 break;
2455
2456 case SOCKET_STOP_PRE_SIGTERM:
2457 if (s->kill_context.send_sigkill) {
2458 log_unit_warning(UNIT(s)->id, "%s stopping timed out. Killing.", UNIT(s)->id);
2459 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2460 } else {
2461 log_unit_warning(UNIT(s)->id, "%s stopping timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
2462 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2463 }
2464 break;
2465
2466 case SOCKET_STOP_PRE_SIGKILL:
2467 log_unit_warning(UNIT(s)->id, "%s still around after SIGKILL. Ignoring.", UNIT(s)->id);
2468 socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
2469 break;
2470
2471 case SOCKET_STOP_POST:
2472 log_unit_warning(UNIT(s)->id, "%s stopping timed out (2). Terminating.", UNIT(s)->id);
2473 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
2474 break;
2475
2476 case SOCKET_FINAL_SIGTERM:
2477 if (s->kill_context.send_sigkill) {
2478 log_unit_warning(UNIT(s)->id, "%s stopping timed out (2). Killing.", UNIT(s)->id);
2479 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
2480 } else {
2481 log_unit_warning(UNIT(s)->id, "%s stopping timed out (2). Skipping SIGKILL. Ignoring.", UNIT(s)->id);
2482 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2483 }
2484 break;
2485
2486 case SOCKET_FINAL_SIGKILL:
2487 log_unit_warning(UNIT(s)->id, "%s still around after SIGKILL (2). Entering failed mode.", UNIT(s)->id);
2488 socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
2489 break;
2490
2491 default:
2492 assert_not_reached("Timeout at wrong time.");
2493 }
2494
2495 return 0;
2496 }
2497
2498 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
2499 int *rfds;
2500 unsigned rn_fds, k;
2501 SocketPort *p;
2502
2503 assert(s);
2504 assert(fds);
2505 assert(n_fds);
2506
2507 /* Called from the service code for requesting our fds */
2508
2509 rn_fds = 0;
2510 LIST_FOREACH(port, p, s->ports)
2511 if (p->fd >= 0)
2512 rn_fds++;
2513
2514 if (rn_fds <= 0) {
2515 *fds = NULL;
2516 *n_fds = 0;
2517 return 0;
2518 }
2519
2520 if (!(rfds = new(int, rn_fds)))
2521 return -ENOMEM;
2522
2523 k = 0;
2524 LIST_FOREACH(port, p, s->ports)
2525 if (p->fd >= 0)
2526 rfds[k++] = p->fd;
2527
2528 assert(k == rn_fds);
2529
2530 *fds = rfds;
2531 *n_fds = rn_fds;
2532
2533 return 0;
2534 }
2535
2536 static void socket_reset_failed(Unit *u) {
2537 Socket *s = SOCKET(u);
2538
2539 assert(s);
2540
2541 if (s->state == SOCKET_FAILED)
2542 socket_set_state(s, SOCKET_DEAD);
2543
2544 s->result = SOCKET_SUCCESS;
2545 }
2546
2547 static void socket_notify_service_dead(Socket *s, bool failed_permanent) {
2548 assert(s);
2549
2550 /* The service is dead. Dang!
2551 *
2552 * This is strictly for one-instance-for-all-connections
2553 * services. */
2554
2555 if (s->state == SOCKET_RUNNING) {
2556 log_unit_debug(UNIT(s)->id, "%s got notified about service death (failed permanently: %s)", UNIT(s)->id, yes_no(failed_permanent));
2557 if (failed_permanent)
2558 socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_FAILED_PERMANENT);
2559 else
2560 socket_enter_listening(s);
2561 }
2562 }
2563
2564 void socket_connection_unref(Socket *s) {
2565 assert(s);
2566
2567 /* The service is dead. Yay!
2568 *
2569 * This is strictly for one-instance-per-connection
2570 * services. */
2571
2572 assert(s->n_connections > 0);
2573 s->n_connections--;
2574
2575 log_unit_debug(UNIT(s)->id, "%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
2576 }
2577
2578 static void socket_trigger_notify(Unit *u, Unit *other) {
2579 Socket *s = SOCKET(u);
2580 Service *se;
2581
2582 assert(u);
2583 assert(other);
2584
2585 /* Don't propagate state changes from the service if we are
2586 already down or accepting connections */
2587 if ((s->state != SOCKET_RUNNING &&
2588 s->state != SOCKET_LISTENING) ||
2589 s->accept)
2590 return;
2591
2592 if (other->load_state != UNIT_LOADED ||
2593 other->type != UNIT_SERVICE)
2594 return;
2595
2596 se = SERVICE(other);
2597
2598 if (se->state == SERVICE_FAILED)
2599 socket_notify_service_dead(s, se->result == SERVICE_FAILURE_START_LIMIT);
2600
2601 if (se->state == SERVICE_DEAD ||
2602 se->state == SERVICE_FINAL_SIGTERM ||
2603 se->state == SERVICE_FINAL_SIGKILL ||
2604 se->state == SERVICE_AUTO_RESTART)
2605 socket_notify_service_dead(s, false);
2606
2607 if (se->state == SERVICE_RUNNING)
2608 socket_set_state(s, SOCKET_RUNNING);
2609 }
2610
2611 static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
2612 return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error);
2613 }
2614
2615 static int socket_get_timeout(Unit *u, uint64_t *timeout) {
2616 Socket *s = SOCKET(u);
2617 int r;
2618
2619 if (!s->timer_event_source)
2620 return 0;
2621
2622 r = sd_event_source_get_time(s->timer_event_source, timeout);
2623 if (r < 0)
2624 return r;
2625
2626 return 1;
2627 }
2628
2629 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
2630 [SOCKET_DEAD] = "dead",
2631 [SOCKET_START_PRE] = "start-pre",
2632 [SOCKET_START_CHOWN] = "start-chown",
2633 [SOCKET_START_POST] = "start-post",
2634 [SOCKET_LISTENING] = "listening",
2635 [SOCKET_RUNNING] = "running",
2636 [SOCKET_STOP_PRE] = "stop-pre",
2637 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
2638 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
2639 [SOCKET_STOP_POST] = "stop-post",
2640 [SOCKET_FINAL_SIGTERM] = "final-sigterm",
2641 [SOCKET_FINAL_SIGKILL] = "final-sigkill",
2642 [SOCKET_FAILED] = "failed"
2643 };
2644
2645 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
2646
2647 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
2648 [SOCKET_EXEC_START_PRE] = "StartPre",
2649 [SOCKET_EXEC_START_CHOWN] = "StartChown",
2650 [SOCKET_EXEC_START_POST] = "StartPost",
2651 [SOCKET_EXEC_STOP_PRE] = "StopPre",
2652 [SOCKET_EXEC_STOP_POST] = "StopPost"
2653 };
2654
2655 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
2656
2657 static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
2658 [SOCKET_SUCCESS] = "success",
2659 [SOCKET_FAILURE_RESOURCES] = "resources",
2660 [SOCKET_FAILURE_TIMEOUT] = "timeout",
2661 [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
2662 [SOCKET_FAILURE_SIGNAL] = "signal",
2663 [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
2664 [SOCKET_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent"
2665 };
2666
2667 DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
2668
2669 const UnitVTable socket_vtable = {
2670 .object_size = sizeof(Socket),
2671 .exec_context_offset = offsetof(Socket, exec_context),
2672 .cgroup_context_offset = offsetof(Socket, cgroup_context),
2673 .kill_context_offset = offsetof(Socket, kill_context),
2674 .exec_runtime_offset = offsetof(Socket, exec_runtime),
2675
2676 .sections =
2677 "Unit\0"
2678 "Socket\0"
2679 "Install\0",
2680 .private_section = "Socket",
2681
2682 .init = socket_init,
2683 .done = socket_done,
2684 .load = socket_load,
2685
2686 .coldplug = socket_coldplug,
2687
2688 .dump = socket_dump,
2689
2690 .start = socket_start,
2691 .stop = socket_stop,
2692
2693 .kill = socket_kill,
2694
2695 .get_timeout = socket_get_timeout,
2696
2697 .serialize = socket_serialize,
2698 .deserialize_item = socket_deserialize_item,
2699 .distribute_fds = socket_distribute_fds,
2700
2701 .active_state = socket_active_state,
2702 .sub_state_to_string = socket_sub_state_to_string,
2703
2704 .check_gc = socket_check_gc,
2705
2706 .sigchld_event = socket_sigchld_event,
2707
2708 .trigger_notify = socket_trigger_notify,
2709
2710 .reset_failed = socket_reset_failed,
2711
2712 .bus_interface = "org.freedesktop.systemd1.Socket",
2713 .bus_vtable = bus_socket_vtable,
2714 .bus_set_property = bus_socket_set_property,
2715 .bus_commit_properties = bus_socket_commit_properties,
2716
2717 .status_message_formats = {
2718 /*.starting_stopping = {
2719 [0] = "Starting socket %s...",
2720 [1] = "Stopping socket %s...",
2721 },*/
2722 .finished_start_job = {
2723 [JOB_DONE] = "Listening on %s.",
2724 [JOB_FAILED] = "Failed to listen on %s.",
2725 [JOB_DEPENDENCY] = "Dependency failed for %s.",
2726 [JOB_TIMEOUT] = "Timed out starting %s.",
2727 },
2728 .finished_stop_job = {
2729 [JOB_DONE] = "Closed %s.",
2730 [JOB_FAILED] = "Failed stopping %s.",
2731 [JOB_TIMEOUT] = "Timed out stopping %s.",
2732 },
2733 },
2734 };
Unnamed repository; edit this file 'description' to name the repository.