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units: make sure the file system is writable before we write utmp data
[thirdparty/systemd.git] / src / socket.c
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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
5cb5a6ff 2
a7334b09
LP		 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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
83c60c9f
LP		 22#include <sys/types.h>
23#include <sys/stat.h>
24#include <unistd.h>
25#include <errno.h>
26#include <fcntl.h>
f94ea366 27#include <sys/epoll.h>
034c6ed7 28#include <signal.h>
4f2d528d 29#include <arpa/inet.h>
83c60c9f 30
87f0e418 31#include "unit.h"
5cb5a6ff 32#include "socket.h"
cebf8b20 33#include "netinet/tcp.h"
83c60c9f 34#include "log.h"
23a177ef
LP		 35#include "load-dropin.h"
36#include "load-fragment.h"
9e2f7c11 37#include "strv.h"
4f2d528d 38#include "unit-name.h"
4139c1b2 39#include "dbus-socket.h"
4fd5948e 40#include "missing.h"
a40eb732 41#include "special.h"
398ef8ba 42#include "bus-errors.h"
e51bc1a2 43#include "label.h"
83c60c9f 44
acbb0225 45static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
87f0e418
LP		 46 [SOCKET_DEAD] = UNIT_INACTIVE,
47 [SOCKET_START_PRE] = UNIT_ACTIVATING,
48 [SOCKET_START_POST] = UNIT_ACTIVATING,
49 [SOCKET_LISTENING] = UNIT_ACTIVE,
50 [SOCKET_RUNNING] = UNIT_ACTIVE,
51 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
52 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
53 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
54 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
80876c20
LP		 55 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
56 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
fdf20a31 57 [SOCKET_FAILED] = UNIT_FAILED
83c60c9f 58};
5cb5a6ff 59
a16e1123
LP		 60static void socket_init(Unit *u) {
61 Socket *s = SOCKET(u);
62
63 assert(u);
64 assert(u->meta.load_state == UNIT_STUB);
65
a16e1123
LP		 66 s->backlog = SOMAXCONN;
67 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
68 s->directory_mode = 0755;
69 s->socket_mode = 0666;
70
6cf6bbc2
LP		 71 s->max_connections = 64;
72
4fd5948e 73 s->priority = -1;
4fd5948e
LP		 74 s->ip_tos = -1;
75 s->ip_ttl = -1;
4fd5948e 76 s->mark = -1;
4fd5948e 77
a16e1123
LP		 78 exec_context_init(&s->exec_context);
79
80 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
81}
acbb0225 82
5e94833f
LP		 83static void socket_unwatch_control_pid(Socket *s) {
84 assert(s);
85
86 if (s->control_pid <= 0)
87 return;
88
89 unit_unwatch_pid(UNIT(s), s->control_pid);
90 s->control_pid = 0;
91}
92
87f0e418
LP		 93static void socket_done(Unit *u) {
94 Socket *s = SOCKET(u);
034c6ed7 95 SocketPort *p;
6cf6bbc2 96 Meta *i;
034c6ed7
LP		 97
98 assert(s);
99
100 while ((p = s->ports)) {
101 LIST_REMOVE(SocketPort, port, s->ports, p);
102
a16e1123
LP		 103 if (p->fd >= 0) {
104 unit_unwatch_fd(UNIT(s), &p->fd_watch);
105 close_nointr_nofail(p->fd);
106 }
107
034c6ed7
LP		 108 free(p->path);
109 free(p);
110 }
111
112 exec_context_done(&s->exec_context);
e537352b 113 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
034c6ed7
LP		 114 s->control_command = NULL;
115
5e94833f 116 socket_unwatch_control_pid(s);
034c6ed7
LP		 117
118 s->service = NULL;
119
cebf8b20
TT		 120 free(s->tcp_congestion);
121 s->tcp_congestion = NULL;
122
acbb0225 123 free(s->bind_to_device);
e537352b 124 s->bind_to_device = NULL;
acbb0225
LP		 125
126 unit_unwatch_timer(u, &s->timer_watch);
6cf6bbc2
LP		 127
128 /* Make sure no service instance refers to us anymore. */
129 LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
130 Service *service = (Service *) i;
131
132 if (service->socket == s)
133 service->socket = NULL;
134 }
5cb5a6ff
LP		 135}
136
b15bdda8
LP		 137static int socket_instantiate_service(Socket *s) {
138 char *prefix, *name;
139 int r;
140 Unit *u;
141
142 assert(s);
143
144 /* This fills in s->service if it isn't filled in yet. For
145 * Accept=yes sockets we create the next connection service
146 * here. For Accept=no this is mostly a NOP since the service
147 * is figured out at load time anyway. */
148
149 if (s->service)
150 return 0;
151
152 assert(s->accept);
153
154 if (!(prefix = unit_name_to_prefix(s->meta.id)))
155 return -ENOMEM;
156
157 r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
158 free(prefix);
159
160 if (r < 0)
161 return -ENOMEM;
162
163 r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
164 free(name);
165
166 if (r < 0)
167 return r;
168
6c073082 169 u->meta.no_gc = true;
b15bdda8
LP		 170 s->service = SERVICE(u);
171 return 0;
172}
173
4f2d528d
LP		 174static bool have_non_accept_socket(Socket *s) {
175 SocketPort *p;
176
177 assert(s);
178
179 if (!s->accept)
180 return true;
181
dd5ad9d4
LP		 182 LIST_FOREACH(port, p, s->ports) {
183
184 if (p->type != SOCKET_SOCKET)
185 return true;
186
4f2d528d
LP		 187 if (!socket_address_can_accept(&p->address))
188 return true;
dd5ad9d4 189 }
4f2d528d
LP		 190
191 return false;
192}
193
194static int socket_verify(Socket *s) {
195 assert(s);
196
4cd1fbcc 197 if (s->meta.load_state != UNIT_LOADED)
4f2d528d
LP		 198 return 0;
199
200 if (!s->ports) {
4cd1fbcc 201 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
4f2d528d
LP		 202 return -EINVAL;
203 }
204
0009d2a6
LP		 205 if (s->accept && have_non_accept_socket(s)) {
206 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
207 return -EINVAL;
208 }
209
6cf6bbc2 210 if (s->accept && s->max_connections <= 0) {
4d0e5dbd
LP		 211 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
212 return -EINVAL;
213 }
214
2e22afe9 215 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
4d0e5dbd 216 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
6cf6bbc2
LP		 217 return -EINVAL;
218 }
219
4f2d528d
LP		 220 return 0;
221}
222
6e2ef85b
LP		 223static bool socket_needs_mount(Socket *s, const char *prefix) {
224 SocketPort *p;
225
226 assert(s);
227
228 LIST_FOREACH(port, p, s->ports) {
229
230 if (p->type == SOCKET_SOCKET) {
231 if (socket_address_needs_mount(&p->address, prefix))
232 return true;
233 } else {
234 assert(p->type == SOCKET_FIFO);
235 if (path_startswith(p->path, prefix))
236 return true;
237 }
238 }
239
240 return false;
241}
242
243int socket_add_one_mount_link(Socket *s, Mount *m) {
244 int r;
245
246 assert(s);
247 assert(m);
248
249 if (s->meta.load_state != UNIT_LOADED ||
250 m->meta.load_state != UNIT_LOADED)
251 return 0;
252
253 if (!socket_needs_mount(s, m->where))
254 return 0;
255
2c966c03 256 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
6e2ef85b
LP		 257 return r;
258
259 return 0;
260}
261
262static int socket_add_mount_links(Socket *s) {
263 Meta *other;
264 int r;
265
266 assert(s);
267
268 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
269 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
270 return r;
271
272 return 0;
273}
274
275static int socket_add_device_link(Socket *s) {
276 char *t;
277 int r;
278
279 assert(s);
280
281 if (!s->bind_to_device)
282 return 0;
283
284 if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
285 return -ENOMEM;
286
287 r = unit_add_node_link(UNIT(s), t, false);
288 free(t);
289
290 return r;
291}
292
a40eb732
LP		 293static int socket_add_default_dependencies(Socket *s) {
294 int r;
295 assert(s);
296
297 if (s->meta.manager->running_as == MANAGER_SYSTEM)
298 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
299 return r;
300
69dd2852 301 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
a40eb732
LP		 302}
303
e537352b
LP		 304static int socket_load(Unit *u) {
305 Socket *s = SOCKET(u);
306 int r;
44d8db9e 307
e537352b
LP		 308 assert(u);
309 assert(u->meta.load_state == UNIT_STUB);
44d8db9e 310
e537352b 311 if ((r = unit_load_fragment_and_dropin(u)) < 0)
23a177ef 312 return r;
44d8db9e 313
23a177ef 314 /* This is a new unit? Then let's add in some extras */
e537352b 315 if (u->meta.load_state == UNIT_LOADED) {
44d8db9e 316
4f2d528d 317 if (have_non_accept_socket(s)) {
25366e09 318 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
4f2d528d 319 return r;
23a177ef 320
701cc384 321 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
4f2d528d
LP		 322 return r;
323 }
44d8db9e 324
6e2ef85b
LP		 325 if ((r = socket_add_mount_links(s)) < 0)
326 return r;
327
328 if ((r = socket_add_device_link(s)) < 0)
329 return r;
330
23a177ef
LP		 331 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
332 return r;
333
334 if ((r = unit_add_default_cgroup(u)) < 0)
335 return r;
a40eb732
LP		 336
337 if (s->meta.default_dependencies)
338 if ((r = socket_add_default_dependencies(s)) < 0)
339 return r;
23a177ef
LP		 340 }
341
4f2d528d 342 return socket_verify(s);
44d8db9e
LP		 343}
344
542563ba
LP		 345static const char* listen_lookup(int type) {
346
347 if (type == SOCK_STREAM)
348 return "ListenStream";
349 else if (type == SOCK_DGRAM)
350 return "ListenDatagram";
351 else if (type == SOCK_SEQPACKET)
352 return "ListenSequentialPacket";
353
034c6ed7 354 assert_not_reached("Unknown socket type");
542563ba
LP		 355 return NULL;
356}
357
87f0e418 358static void socket_dump(Unit *u, FILE *f, const char *prefix) {
5cb5a6ff 359
5cb5a6ff 360 SocketExecCommand c;
87f0e418 361 Socket *s = SOCKET(u);
542563ba 362 SocketPort *p;
82ba9f08
LP		 363 const char *prefix2;
364 char *p2;
5cb5a6ff
LP		 365
366 assert(s);
fa068367 367 assert(f);
5cb5a6ff 368
82ba9f08
LP		 369 p2 = strappend(prefix, "\t");
370 prefix2 = p2 ? p2 : prefix;
c43d20a0 371
5cb5a6ff
LP		 372 fprintf(f,
373 "%sSocket State: %s\n"
542563ba 374 "%sBindIPv6Only: %s\n"
b5a0699f
LP		 375 "%sBacklog: %u\n"
376 "%sSocketMode: %04o\n"
4fd5948e
LP		 377 "%sDirectoryMode: %04o\n"
378 "%sKeepAlive: %s\n"
cebf8b20
TT		 379 "%sFreeBind: %s\n"
380 "%sTCPCongestion: %s\n",
a16e1123 381 prefix, socket_state_to_string(s->state),
c0120d99 382 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
b5a0699f
LP		 383 prefix, s->backlog,
384 prefix, s->socket_mode,
4fd5948e
LP		 385 prefix, s->directory_mode,
386 prefix, yes_no(s->keep_alive),
cebf8b20
TT		 387 prefix, yes_no(s->free_bind),
388 prefix, s->tcp_congestion);
542563ba 389
70123e68
LP		 390 if (s->control_pid > 0)
391 fprintf(f,
bb00e604
LP		 392 "%sControl PID: %lu\n",
393 prefix, (unsigned long) s->control_pid);
70123e68 394
acbb0225
LP		 395 if (s->bind_to_device)
396 fprintf(f,
397 "%sBindToDevice: %s\n",
398 prefix, s->bind_to_device);
399
4f2d528d
LP		 400 if (s->accept)
401 fprintf(f,
6cf6bbc2
LP		 402 "%sAccepted: %u\n"
403 "%sNConnections: %u\n"
404 "%sMaxConnections: %u\n",
405 prefix, s->n_accepted,
406 prefix, s->n_connections,
407 prefix, s->max_connections);
4f2d528d 408
4fd5948e
LP		 409 if (s->priority >= 0)
410 fprintf(f,
411 "%sPriority: %i\n",
412 prefix, s->priority);
413
414 if (s->receive_buffer > 0)
415 fprintf(f,
416 "%sReceiveBuffer: %zu\n",
417 prefix, s->receive_buffer);
418
419 if (s->send_buffer > 0)
420 fprintf(f,
421 "%sSendBuffer: %zu\n",
422 prefix, s->send_buffer);
423
424 if (s->ip_tos >= 0)
425 fprintf(f,
426 "%sIPTOS: %i\n",
427 prefix, s->ip_tos);
428
429 if (s->ip_ttl >= 0)
430 fprintf(f,
431 "%sIPTTL: %i\n",
432 prefix, s->ip_ttl);
433
434 if (s->pipe_size > 0)
435 fprintf(f,
436 "%sPipeSize: %zu\n",
437 prefix, s->pipe_size);
438
439 if (s->mark >= 0)
440 fprintf(f,
441 "%sMark: %i\n",
442 prefix, s->mark);
443
034c6ed7 444 LIST_FOREACH(port, p, s->ports) {
5cb5a6ff 445
542563ba
LP		 446 if (p->type == SOCKET_SOCKET) {
447 const char *t;
448 int r;
e364ad06 449 char *k = NULL;
542563ba
LP		 450
451 if ((r = socket_address_print(&p->address, &k)) < 0)
452 t = strerror(-r);
453 else
454 t = k;
455
e364ad06 456 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t);
542563ba
LP		 457 free(k);
458 } else
459 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
460 }
5cb5a6ff
LP		 461
462 exec_context_dump(&s->exec_context, f, prefix);
463
e537352b 464 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
c43d20a0
LP		 465 if (!s->exec_command[c])
466 continue;
5cb5a6ff 467
40d50879 468 fprintf(f, "%s-> %s:\n",
a16e1123 469 prefix, socket_exec_command_to_string(c));
c43d20a0
LP		 470
471 exec_command_dump_list(s->exec_command[c], f, prefix2);
5cb5a6ff 472 }
c43d20a0 473
82ba9f08 474 free(p2);
5cb5a6ff
LP		 475}
476
4f2d528d
LP		 477static int instance_from_socket(int fd, unsigned nr, char **instance) {
478 socklen_t l;
479 char *r;
480 union {
481 struct sockaddr sa;
482 struct sockaddr_un un;
483 struct sockaddr_in in;
484 struct sockaddr_in6 in6;
485 struct sockaddr_storage storage;
486 } local, remote;
487
488 assert(fd >= 0);
489 assert(instance);
490
491 l = sizeof(local);
492 if (getsockname(fd, &local.sa, &l) < 0)
493 return -errno;
494
495 l = sizeof(remote);
496 if (getpeername(fd, &remote.sa, &l) < 0)
497 return -errno;
498
499 switch (local.sa.sa_family) {
500
501 case AF_INET: {
502 uint32_t
503 a = ntohl(local.in.sin_addr.s_addr),
504 b = ntohl(remote.in.sin_addr.s_addr);
505
506 if (asprintf(&r,
b15bdda8 507 "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
4f2d528d
LP		 508 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
509 ntohs(local.in.sin_port),
510 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
511 ntohs(remote.in.sin_port)) < 0)
512 return -ENOMEM;
513
514 break;
515 }
516
517 case AF_INET6: {
2b061f5a
LP		 518 static const char ipv4_prefix[] = {
519 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
520 };
521
522 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
523 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
524 const uint8_t
525 *a = local.in6.sin6_addr.s6_addr+12,
526 *b = remote.in6.sin6_addr.s6_addr+12;
527
528 if (asprintf(&r,
b15bdda8 529 "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
2b061f5a
LP		 530 a[0], a[1], a[2], a[3],
531 ntohs(local.in6.sin6_port),
532 b[0], b[1], b[2], b[3],
533 ntohs(remote.in6.sin6_port)) < 0)
534 return -ENOMEM;
535 } else {
536 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
537
538 if (asprintf(&r,
b15bdda8 539 "%s:%u-%s:%u",
2b061f5a
LP		 540 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
541 ntohs(local.in6.sin6_port),
542 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
543 ntohs(remote.in6.sin6_port)) < 0)
544 return -ENOMEM;
545 }
4f2d528d
LP		 546
547 break;
548 }
549
550 case AF_UNIX: {
551 struct ucred ucred;
552
553 l = sizeof(ucred);
554 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
555 return -errno;
556
557 if (asprintf(&r,
bb00e604 558 "%u-%lu-%lu",
4f2d528d 559 nr,
bb00e604
LP		 560 (unsigned long) ucred.pid,
561 (unsigned long) ucred.uid) < 0)
4f2d528d
LP		 562 return -ENOMEM;
563
564 break;
565 }
566
567 default:
568 assert_not_reached("Unhandled socket type.");
569 }
570
571 *instance = r;
572 return 0;
573}
574
034c6ed7 575static void socket_close_fds(Socket *s) {
83c60c9f
LP		 576 SocketPort *p;
577
578 assert(s);
579
034c6ed7 580 LIST_FOREACH(port, p, s->ports) {
83c60c9f
LP		 581 if (p->fd < 0)
582 continue;
583
acbb0225 584 unit_unwatch_fd(UNIT(s), &p->fd_watch);
a16e1123
LP		 585 close_nointr_nofail(p->fd);
586
587 /* One little note: we should never delete any sockets
588 * in the file system here! After all some other
589 * process we spawned might still have a reference of
590 * this fd and wants to continue to use it. Therefore
591 * we delete sockets in the file system before we
592 * create a new one, not after we stopped using
593 * one! */
9152c765 594
83c60c9f
LP		 595 p->fd = -1;
596 }
597}
598
4fd5948e
LP		 599static void socket_apply_socket_options(Socket *s, int fd) {
600 assert(s);
601 assert(fd >= 0);
602
603 if (s->keep_alive) {
604 int b = s->keep_alive;
605 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
606 log_warning("SO_KEEPALIVE failed: %m");
607 }
608
609 if (s->priority >= 0)
610 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
611 log_warning("SO_PRIORITY failed: %m");
612
613 if (s->receive_buffer > 0) {
614 int value = (int) s->receive_buffer;
615 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
616 log_warning("SO_RCVBUF failed: %m");
617 }
618
619 if (s->send_buffer > 0) {
620 int value = (int) s->send_buffer;
621 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
622 log_warning("SO_SNDBUF failed: %m");
623 }
624
625 if (s->mark >= 0)
626 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
627 log_warning("SO_MARK failed: %m");
628
629 if (s->ip_tos >= 0)
630 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
631 log_warning("IP_TOS failed: %m");
632
46925ac5
LP		 633 if (s->ip_ttl >= 0) {
634 int r, x;
635
636 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
637 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
638
639 if (r < 0 && x < 0)
640 log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
641 }
cebf8b20
TT		 642
643 if (s->tcp_congestion)
644 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
645 log_warning("TCP_CONGESTION failed: %m");
4fd5948e
LP		 646}
647
b15bdda8 648static void socket_apply_fifo_options(Socket *s, int fd) {
4fd5948e
LP		 649 assert(s);
650 assert(fd >= 0);
651
652 if (s->pipe_size > 0)
653 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
654 log_warning("F_SETPIPE_SZ: %m");
655}
656
7a58bfa4 657
b15bdda8
LP		 658static int fifo_address_create(
659 const char *path,
660 mode_t directory_mode,
661 mode_t socket_mode,
b15bdda8
LP		 662 int *_fd) {
663
7a58bfa4 664 int fd = -1, r = 0;
b15bdda8
LP		 665 struct stat st;
666 mode_t old_mask;
667
668 assert(path);
669 assert(_fd);
670
671 mkdir_parents(path, directory_mode);
672
c4e2ceae 673 if ((r = label_fifofile_set(path)) < 0)
56cf987f 674 goto fail;
b15bdda8
LP		 675
676 /* Enforce the right access mode for the fifo */
677 old_mask = umask(~ socket_mode);
678
679 /* Include the original umask in our mask */
680 umask(~socket_mode | old_mask);
681
682 r = mkfifo(path, socket_mode);
683 umask(old_mask);
684
685 if (r < 0) {
686 r = -errno;
687 goto fail;
688 }
689
690 if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
691 r = -errno;
692 goto fail;
693 }
694
56cf987f 695 label_file_clear();
7a58bfa4 696
b15bdda8
LP		 697 if (fstat(fd, &st) < 0) {
698 r = -errno;
699 goto fail;
700 }
701
702 if (!S_ISFIFO(st.st_mode) ||
de0200fc 703 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
b15bdda8
LP		 704 st.st_uid != getuid() ||
705 st.st_gid != getgid()) {
706
707 r = -EEXIST;
708 goto fail;
709 }
710
711 *_fd = fd;
712 return 0;
713
714fail:
56cf987f
DW		 715 label_file_clear();
716
b15bdda8
LP		 717 if (fd >= 0)
718 close_nointr_nofail(fd);
719
720 return r;
721}
722
034c6ed7 723static int socket_open_fds(Socket *s) {
83c60c9f
LP		 724 SocketPort *p;
725 int r;
56cf987f 726 char *label = NULL;
049f8642 727 bool know_label = false;
83c60c9f
LP		 728
729 assert(s);
730
034c6ed7 731 LIST_FOREACH(port, p, s->ports) {
83c60c9f 732
034c6ed7
LP		 733 if (p->fd >= 0)
734 continue;
83c60c9f
LP		 735
736 if (p->type == SOCKET_SOCKET) {
737
049f8642
LP		 738 if (!know_label) {
739
740 if ((r = socket_instantiate_service(s)) < 0)
741 return r;
742
743 if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
744 return r;
745
746 know_label = true;
747 }
748
b5a0699f
LP		 749 if ((r = socket_address_listen(
750 &p->address,
751 s->backlog,
752 s->bind_ipv6_only,
753 s->bind_to_device,
4fd5948e 754 s->free_bind,
b5a0699f
LP		 755 s->directory_mode,
756 s->socket_mode,
56cf987f 757 label,
b5a0699f 758 &p->fd)) < 0)
83c60c9f
LP		 759 goto rollback;
760
4fd5948e
LP		 761 socket_apply_socket_options(s, p->fd);
762
b15bdda8 763 } else if (p->type == SOCKET_FIFO) {
83c60c9f 764
b15bdda8
LP		 765 if ((r = fifo_address_create(
766 p->path,
767 s->directory_mode,
768 s->socket_mode,
b15bdda8 769 &p->fd)) < 0)
83c60c9f 770 goto rollback;
83c60c9f 771
b15bdda8 772 socket_apply_fifo_options(s, p->fd);
83c60c9f 773
b15bdda8
LP		 774 } else
775 assert_not_reached("Unknown port type");
034c6ed7
LP		 776 }
777
56cf987f 778 label_free(label);
034c6ed7
LP		 779 return 0;
780
781rollback:
782 socket_close_fds(s);
56cf987f 783 label_free(label);
034c6ed7
LP		 784 return r;
785}
786
787static void socket_unwatch_fds(Socket *s) {
788 SocketPort *p;
9152c765 789
034c6ed7
LP		 790 assert(s);
791
792 LIST_FOREACH(port, p, s->ports) {
793 if (p->fd < 0)
794 continue;
795
acbb0225 796 unit_unwatch_fd(UNIT(s), &p->fd_watch);
83c60c9f 797 }
034c6ed7
LP		 798}
799
800static int socket_watch_fds(Socket *s) {
801 SocketPort *p;
802 int r;
803
804 assert(s);
83c60c9f 805
034c6ed7
LP		 806 LIST_FOREACH(port, p, s->ports) {
807 if (p->fd < 0)
808 continue;
809
cabab516 810 p->fd_watch.socket_accept =
4f2d528d 811 s->accept &&
dd5ad9d4 812 p->type == SOCKET_SOCKET &&
4f2d528d
LP		 813 socket_address_can_accept(&p->address);
814
f94ea366 815 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
034c6ed7
LP		 816 goto fail;
817 }
83c60c9f 818
542563ba 819 return 0;
83c60c9f 820
034c6ed7
LP		 821fail:
822 socket_unwatch_fds(s);
823 return r;
824}
825
826static void socket_set_state(Socket *s, SocketState state) {
827 SocketState old_state;
828 assert(s);
829
830 old_state = s->state;
831 s->state = state;
832
833 if (state != SOCKET_START_PRE &&
834 state != SOCKET_START_POST &&
835 state != SOCKET_STOP_PRE &&
836 state != SOCKET_STOP_PRE_SIGTERM &&
837 state != SOCKET_STOP_PRE_SIGKILL &&
838 state != SOCKET_STOP_POST &&
80876c20
LP		 839 state != SOCKET_FINAL_SIGTERM &&
840 state != SOCKET_FINAL_SIGKILL) {
acbb0225 841 unit_unwatch_timer(UNIT(s), &s->timer_watch);
5e94833f 842 socket_unwatch_control_pid(s);
034c6ed7 843 s->control_command = NULL;
a16e1123 844 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
e537352b 845 }
034c6ed7 846
a16e1123
LP		 847 if (state != SOCKET_LISTENING)
848 socket_unwatch_fds(s);
849
034c6ed7
LP		 850 if (state != SOCKET_START_POST &&
851 state != SOCKET_LISTENING &&
852 state != SOCKET_RUNNING &&
853 state != SOCKET_STOP_PRE &&
854 state != SOCKET_STOP_PRE_SIGTERM &&
855 state != SOCKET_STOP_PRE_SIGKILL)
856 socket_close_fds(s);
857
e537352b 858 if (state != old_state)
40d50879 859 log_debug("%s changed %s -> %s",
a16e1123
LP		 860 s->meta.id,
861 socket_state_to_string(old_state),
862 socket_state_to_string(state));
acbb0225
LP		 863
864 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
034c6ed7
LP		 865}
866
a16e1123
LP		 867static int socket_coldplug(Unit *u) {
868 Socket *s = SOCKET(u);
869 int r;
870
871 assert(s);
872 assert(s->state == SOCKET_DEAD);
873
874 if (s->deserialized_state != s->state) {
875
876 if (s->deserialized_state == SOCKET_START_PRE ||
877 s->deserialized_state == SOCKET_START_POST ||
878 s->deserialized_state == SOCKET_STOP_PRE ||
879 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
880 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
881 s->deserialized_state == SOCKET_STOP_POST ||
882 s->deserialized_state == SOCKET_FINAL_SIGTERM ||
883 s->deserialized_state == SOCKET_FINAL_SIGKILL) {
884
885 if (s->control_pid <= 0)
886 return -EBADMSG;
887
888 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
889 return r;
890
891 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
892 return r;
893 }
894
895 if (s->deserialized_state == SOCKET_START_POST ||
896 s->deserialized_state == SOCKET_LISTENING ||
897 s->deserialized_state == SOCKET_RUNNING ||
898 s->deserialized_state == SOCKET_STOP_PRE ||
899 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
900 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
901 if ((r = socket_open_fds(s)) < 0)
902 return r;
903
904 if (s->deserialized_state == SOCKET_LISTENING)
905 if ((r = socket_watch_fds(s)) < 0)
906 return r;
907
908 socket_set_state(s, s->deserialized_state);
909 }
910
911 return 0;
912}
913
e537352b 914static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
034c6ed7
LP		 915 pid_t pid;
916 int r;
9e2f7c11 917 char **argv;
034c6ed7
LP		 918
919 assert(s);
920 assert(c);
921 assert(_pid);
922
e537352b
LP		 923 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
924 goto fail;
034c6ed7 925
9e2f7c11
LP		 926 if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
927 r = -ENOMEM;
928 goto fail;
929 }
930
931 r = exec_spawn(c,
932 argv,
933 &s->exec_context,
934 NULL, 0,
1137a57c 935 s->meta.manager->environment,
9e2f7c11
LP		 936 true,
937 true,
1e3ad081 938 true,
4cd1fbcc
LP		 939 s->meta.manager->confirm_spawn,
940 s->meta.cgroup_bondings,
9e2f7c11
LP		 941 &pid);
942
943 strv_free(argv);
944 if (r < 0)
034c6ed7
LP		 945 goto fail;
946
87f0e418 947 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
034c6ed7
LP		 948 /* FIXME: we need to do something here */
949 goto fail;
83c60c9f 950
034c6ed7
LP		 951 *_pid = pid;
952
953 return 0;
954
955fail:
e537352b 956 unit_unwatch_timer(UNIT(s), &s->timer_watch);
83c60c9f
LP		 957
958 return r;
542563ba
LP		 959}
960
034c6ed7
LP		 961static void socket_enter_dead(Socket *s, bool success) {
962 assert(s);
963
964 if (!success)
965 s->failure = true;
966
fdf20a31 967 socket_set_state(s, s->failure ? SOCKET_FAILED : SOCKET_DEAD);
034c6ed7
LP		 968}
969
80876c20
LP		 970static void socket_enter_signal(Socket *s, SocketState state, bool success);
971
034c6ed7
LP		 972static void socket_enter_stop_post(Socket *s, bool success) {
973 int r;
974 assert(s);
975
976 if (!success)
977 s->failure = true;
978
5e94833f
LP		 979 socket_unwatch_control_pid(s);
980
a16e1123
LP		 981 s->control_command_id = SOCKET_EXEC_STOP_POST;
982
80876c20 983 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
e537352b 984 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
034c6ed7
LP		 985 goto fail;
986
80876c20
LP		 987 socket_set_state(s, SOCKET_STOP_POST);
988 } else
989 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
034c6ed7
LP		 990
991 return;
992
993fail:
6cf6bbc2 994 log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
80876c20 995 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
034c6ed7
LP		 996}
997
998static void socket_enter_signal(Socket *s, SocketState state, bool success) {
999 int r;
ca949c9d
LP		 1000 Set *pid_set = NULL;
1001 bool wait_for_exit = false;
034c6ed7
LP		 1002
1003 assert(s);
1004
1005 if (!success)
1006 s->failure = true;
1007
2e22afe9
LP		 1008 if (s->exec_context.kill_mode != KILL_NONE) {
1009 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
034c6ed7 1010
ca949c9d
LP		 1011 if (s->control_pid > 0) {
1012 if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
1013 -s->control_pid :
1014 s->control_pid, sig) < 0 && errno != ESRCH)
50159e6a 1015
ca949c9d
LP		 1016 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
1017 else
1018 wait_for_exit = true;
034c6ed7 1019 }
50159e6a 1020
ca949c9d
LP		 1021 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1022
1023 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
1024 r = -ENOMEM;
50159e6a
LP		 1025 goto fail;
1026 }
ca949c9d
LP		 1027
1028 /* Exclude the control pid from being killed via the cgroup */
1029 if (s->control_pid > 0)
1030 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
1031 goto fail;
1032
1033 if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) {
1034 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1035 log_warning("Failed to kill control group: %s", strerror(-r));
1036 } else if (r > 0)
1037 wait_for_exit = true;
1038
1039 set_free(pid_set);
1040 }
d6ea93e3 1041 }
034c6ed7 1042
ca949c9d 1043 if (wait_for_exit) {
80876c20
LP		 1044 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1045 goto fail;
d6ea93e3 1046
80876c20
LP		 1047 socket_set_state(s, state);
1048 } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1049 socket_enter_stop_post(s, true);
1050 else
034c6ed7
LP		 1051 socket_enter_dead(s, true);
1052
1053 return;
1054
1055fail:
9e2f7c11 1056 log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
034c6ed7
LP		 1057
1058 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1059 socket_enter_stop_post(s, false);
1060 else
1061 socket_enter_dead(s, false);
ca949c9d
LP		 1062
1063 if (pid_set)
1064 set_free(pid_set);
034c6ed7
LP		 1065}
1066
1067static void socket_enter_stop_pre(Socket *s, bool success) {
1068 int r;
1069 assert(s);
1070
1071 if (!success)
1072 s->failure = true;
1073
5e94833f
LP		 1074 socket_unwatch_control_pid(s);
1075
a16e1123
LP		 1076 s->control_command_id = SOCKET_EXEC_STOP_PRE;
1077
80876c20 1078 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
e537352b 1079 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
034c6ed7
LP		 1080 goto fail;
1081
80876c20
LP		 1082 socket_set_state(s, SOCKET_STOP_PRE);
1083 } else
034c6ed7
LP		 1084 socket_enter_stop_post(s, true);
1085
1086 return;
1087
1088fail:
6cf6bbc2 1089 log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
034c6ed7
LP		 1090 socket_enter_stop_post(s, false);
1091}
1092
e9af15c3
LP		 1093static void socket_enter_listening(Socket *s) {
1094 int r;
1095 assert(s);
1096
1097 if ((r = socket_watch_fds(s)) < 0) {
9e2f7c11 1098 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
e9af15c3
LP		 1099 goto fail;
1100 }
1101
1102 socket_set_state(s, SOCKET_LISTENING);
1103 return;
1104
1105fail:
1106 socket_enter_stop_pre(s, false);
1107}
1108
034c6ed7
LP		 1109static void socket_enter_start_post(Socket *s) {
1110 int r;
1111 assert(s);
1112
e9af15c3 1113 if ((r = socket_open_fds(s)) < 0) {
9e2f7c11 1114 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
034c6ed7
LP		 1115 goto fail;
1116 }
1117
5e94833f
LP		 1118 socket_unwatch_control_pid(s);
1119
a16e1123
LP		 1120 s->control_command_id = SOCKET_EXEC_START_POST;
1121
80876c20 1122 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
e537352b 1123 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
6cf6bbc2 1124 log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
034c6ed7
LP		 1125 goto fail;
1126 }
1127
80876c20
LP		 1128 socket_set_state(s, SOCKET_START_POST);
1129 } else
e9af15c3 1130 socket_enter_listening(s);
034c6ed7
LP		 1131
1132 return;
1133
1134fail:
1135 socket_enter_stop_pre(s, false);
1136}
1137
1138static void socket_enter_start_pre(Socket *s) {
1139 int r;
1140 assert(s);
1141
5e94833f
LP		 1142 socket_unwatch_control_pid(s);
1143
a16e1123
LP		 1144 s->control_command_id = SOCKET_EXEC_START_PRE;
1145
80876c20 1146 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
e537352b 1147 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
034c6ed7
LP		 1148 goto fail;
1149
80876c20
LP		 1150 socket_set_state(s, SOCKET_START_PRE);
1151 } else
034c6ed7
LP		 1152 socket_enter_start_post(s);
1153
1154 return;
1155
1156fail:
6cf6bbc2 1157 log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
034c6ed7
LP		 1158 socket_enter_dead(s, false);
1159}
1160
4f2d528d 1161static void socket_enter_running(Socket *s, int cfd) {
034c6ed7 1162 int r;
398ef8ba 1163 DBusError error;
034c6ed7
LP		 1164
1165 assert(s);
398ef8ba 1166 dbus_error_init(&error);
034c6ed7 1167
ba3e67a7
LP		 1168 /* We don't take connections anymore if we are supposed to
1169 * shut down anyway */
18ffdfda 1170 if (unit_pending_inactive(UNIT(s))) {
7c610628
LP		 1171 if (cfd >= 0)
1172 close_nointr_nofail(cfd);
1173 else {
1174 /* Flush all sockets by closing and reopening them */
1175 socket_close_fds(s);
1176
1177 if ((r = socket_watch_fds(s)) < 0) {
1178 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1179 socket_enter_stop_pre(s, false);
1180 }
1181 }
1182
ba3e67a7
LP		 1183 return;
1184 }
1185
4f2d528d 1186 if (cfd < 0) {
398ef8ba 1187 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
4f2d528d
LP		 1188 goto fail;
1189
1190 socket_set_state(s, SOCKET_RUNNING);
1191 } else {
b4f10a5e 1192 char *prefix, *instance = NULL, *name;
b15bdda8 1193 Service *service;
4f2d528d 1194
6cf6bbc2
LP		 1195 if (s->n_connections >= s->max_connections) {
1196 log_warning("Too many incoming connections (%u)", s->n_connections);
1197 close_nointr_nofail(cfd);
1198 return;
1199 }
1200
b15bdda8
LP		 1201 if ((r = socket_instantiate_service(s)) < 0)
1202 goto fail;
1203
1204 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
4f2d528d
LP		 1205 goto fail;
1206
4cd1fbcc 1207 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
4f2d528d
LP		 1208 free(instance);
1209 r = -ENOMEM;
1210 goto fail;
1211 }
1212
1213 name = unit_name_build(prefix, instance, ".service");
1214 free(prefix);
1215 free(instance);
1216
b6dbbe1c 1217 if (!name) {
4f2d528d 1218 r = -ENOMEM;
b6dbbe1c
LP		 1219 goto fail;
1220 }
4f2d528d 1221
b15bdda8
LP		 1222 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1223 free(name);
4f2d528d 1224 goto fail;
b15bdda8
LP		 1225 }
1226
1227 service = s->service;
1228 s->service = NULL;
1229 s->n_accepted ++;
4f2d528d 1230
6c073082
LP		 1231 service->meta.no_gc = false;
1232
b15bdda8
LP		 1233 unit_choose_id(UNIT(service), name);
1234 free(name);
1235
1236 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
4f2d528d
LP		 1237 goto fail;
1238
1239 cfd = -1;
6cf6bbc2
LP		 1240 s->n_connections ++;
1241
b15bdda8 1242 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
4f2d528d 1243 goto fail;
c4e2ceae
LP		 1244
1245 /* Notify clients about changed counters */
1246 unit_add_to_dbus_queue(UNIT(s));
4f2d528d 1247 }
034c6ed7 1248
034c6ed7
LP		 1249 return;
1250
1251fail:
398ef8ba 1252 log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
80876c20 1253 socket_enter_stop_pre(s, false);
4f2d528d
LP		 1254
1255 if (cfd >= 0)
1256 close_nointr_nofail(cfd);
398ef8ba
LP		 1257
1258 dbus_error_free(&error);
034c6ed7
LP		 1259}
1260
1261static void socket_run_next(Socket *s, bool success) {
1262 int r;
1263
1264 assert(s);
1265 assert(s->control_command);
1266 assert(s->control_command->command_next);
1267
1268 if (!success)
1269 s->failure = true;
1270
5e94833f
LP		 1271 socket_unwatch_control_pid(s);
1272
034c6ed7
LP		 1273 s->control_command = s->control_command->command_next;
1274
e537352b 1275 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
034c6ed7
LP		 1276 goto fail;
1277
1278 return;
1279
1280fail:
6cf6bbc2 1281 log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
80876c20
LP		 1282
1283 if (s->state == SOCKET_START_POST)
1284 socket_enter_stop_pre(s, false);
034c6ed7
LP		 1285 else if (s->state == SOCKET_STOP_POST)
1286 socket_enter_dead(s, false);
1287 else
80876c20 1288 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
034c6ed7
LP		 1289}
1290
87f0e418
LP		 1291static int socket_start(Unit *u) {
1292 Socket *s = SOCKET(u);
83c60c9f
LP		 1293
1294 assert(s);
1295
034c6ed7
LP		 1296 /* We cannot fulfill this request right now, try again later
1297 * please! */
1298 if (s->state == SOCKET_STOP_PRE ||
1299 s->state == SOCKET_STOP_PRE_SIGKILL ||
1300 s->state == SOCKET_STOP_PRE_SIGTERM ||
1301 s->state == SOCKET_STOP_POST ||
80876c20
LP		 1302 s->state == SOCKET_FINAL_SIGTERM ||
1303 s->state == SOCKET_FINAL_SIGKILL)
034c6ed7
LP		 1304 return -EAGAIN;
1305
83c60c9f
LP		 1306 if (s->state == SOCKET_START_PRE ||
1307 s->state == SOCKET_START_POST)
034c6ed7 1308 return 0;
83c60c9f 1309
034c6ed7 1310 /* Cannot run this without the service being around */
4f2d528d
LP		 1311 if (s->service) {
1312 if (s->service->meta.load_state != UNIT_LOADED)
1313 return -ENOENT;
1314
1315 /* If the service is alredy actvie we cannot start the
1316 * socket */
1317 if (s->service->state != SERVICE_DEAD &&
fdf20a31 1318 s->service->state != SERVICE_FAILED &&
4f2d528d
LP		 1319 s->service->state != SERVICE_AUTO_RESTART)
1320 return -EBUSY;
1321 }
e537352b 1322
fdf20a31 1323 assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
83c60c9f 1324
034c6ed7
LP		 1325 s->failure = false;
1326 socket_enter_start_pre(s);
1327 return 0;
1328}
83c60c9f 1329
87f0e418
LP		 1330static int socket_stop(Unit *u) {
1331 Socket *s = SOCKET(u);
034c6ed7
LP		 1332
1333 assert(s);
1334
e537352b
LP		 1335 /* Already on it */
1336 if (s->state == SOCKET_STOP_PRE ||
1337 s->state == SOCKET_STOP_PRE_SIGTERM ||
1338 s->state == SOCKET_STOP_PRE_SIGKILL ||
1339 s->state == SOCKET_STOP_POST ||
80876c20 1340 s->state == SOCKET_FINAL_SIGTERM ||
3f6c78dc 1341 s->state == SOCKET_FINAL_SIGKILL)
e537352b
LP		 1342 return 0;
1343
3f6c78dc
LP		 1344 /* If there's already something running we go directly into
1345 * kill mode. */
1346 if (s->state == SOCKET_START_PRE ||
1347 s->state == SOCKET_START_POST) {
1348 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1349 return -EAGAIN;
1350 }
1351
034c6ed7 1352 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
83c60c9f 1353
034c6ed7 1354 socket_enter_stop_pre(s, true);
542563ba
LP		 1355 return 0;
1356}
1357
a16e1123
LP		 1358static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1359 Socket *s = SOCKET(u);
1360 SocketPort *p;
1361 int r;
1362
1363 assert(u);
1364 assert(f);
1365 assert(fds);
1366
1367 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1368 unit_serialize_item(u, f, "failure", yes_no(s->failure));
1369 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1370
1371 if (s->control_pid > 0)
5925dd3c 1372 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
a16e1123
LP		 1373
1374 if (s->control_command_id >= 0)
1375 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1376
1377 LIST_FOREACH(port, p, s->ports) {
1378 int copy;
1379
1380 if (p->fd < 0)
1381 continue;
1382
1383 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1384 return copy;
1385
1386 if (p->type == SOCKET_SOCKET) {
1387 char *t;
1388
1389 if ((r = socket_address_print(&p->address, &t)) < 0)
1390 return r;
1391
27ca8d7a 1392 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
a16e1123
LP		 1393 free(t);
1394 } else {
1395 assert(p->type == SOCKET_FIFO);
1396 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1397 }
1398 }
1399
1400 return 0;
1401}
1402
1403static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1404 Socket *s = SOCKET(u);
a16e1123
LP		 1405
1406 assert(u);
1407 assert(key);
1408 assert(value);
1409 assert(fds);
1410
1411 if (streq(key, "state")) {
1412 SocketState state;
1413
1414 if ((state = socket_state_from_string(value)) < 0)
1415 log_debug("Failed to parse state value %s", value);
1416 else
1417 s->deserialized_state = state;
1418 } else if (streq(key, "failure")) {
1419 int b;
1420
1421 if ((b = parse_boolean(value)) < 0)
1422 log_debug("Failed to parse failure value %s", value);
1423 else
1424 s->failure = b || s->failure;
1425
1426 } else if (streq(key, "n-accepted")) {
1427 unsigned k;
1428
e364ad06 1429 if (safe_atou(value, &k) < 0)
a16e1123
LP		 1430 log_debug("Failed to parse n-accepted value %s", value);
1431 else
1432 s->n_accepted += k;
1433 } else if (streq(key, "control-pid")) {
5925dd3c 1434 pid_t pid;
a16e1123 1435
e364ad06 1436 if (parse_pid(value, &pid) < 0)
a16e1123
LP		 1437 log_debug("Failed to parse control-pid value %s", value);
1438 else
5925dd3c 1439 s->control_pid = pid;
a16e1123
LP		 1440 } else if (streq(key, "control-command")) {
1441 SocketExecCommand id;
1442
1443 if ((id = socket_exec_command_from_string(value)) < 0)
1444 log_debug("Failed to parse exec-command value %s", value);
1445 else {
1446 s->control_command_id = id;
1447 s->control_command = s->exec_command[id];
1448 }
1449 } else if (streq(key, "fifo")) {
1450 int fd, skip = 0;
1451 SocketPort *p;
1452
1453 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1454 log_debug("Failed to parse fifo value %s", value);
1455 else {
1456
1457 LIST_FOREACH(port, p, s->ports)
1458 if (streq(p->path, value+skip))
1459 break;
1460
1461 if (p) {
1462 if (p->fd >= 0)
1463 close_nointr_nofail(p->fd);
1464 p->fd = fdset_remove(fds, fd);
1465 }
1466 }
1467
1468 } else if (streq(key, "socket")) {
27ca8d7a 1469 int fd, type, skip = 0;
a16e1123
LP		 1470 SocketPort *p;
1471
27ca8d7a 1472 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
a16e1123
LP		 1473 log_debug("Failed to parse socket value %s", value);
1474 else {
1475
1476 LIST_FOREACH(port, p, s->ports)
27ca8d7a 1477 if (socket_address_is(&p->address, value+skip, type))
a16e1123
LP		 1478 break;
1479
1480 if (p) {
1481 if (p->fd >= 0)
1482 close_nointr_nofail(p->fd);
1483 p->fd = fdset_remove(fds, fd);
1484 }
1485 }
1486
1487 } else
1488 log_debug("Unknown serialization key '%s'", key);
1489
1490 return 0;
1491}
1492
87f0e418
LP		 1493static UnitActiveState socket_active_state(Unit *u) {
1494 assert(u);
5cb5a6ff 1495
acbb0225 1496 return state_translation_table[SOCKET(u)->state];
5cb5a6ff
LP		 1497}
1498
10a94420
LP		 1499static const char *socket_sub_state_to_string(Unit *u) {
1500 assert(u);
1501
a16e1123 1502 return socket_state_to_string(SOCKET(u)->state);
10a94420
LP		 1503}
1504
6cf6bbc2
LP		 1505static bool socket_check_gc(Unit *u) {
1506 Socket *s = SOCKET(u);
1507
1508 assert(u);
1509
1510 return s->n_connections > 0;
1511}
1512
acbb0225 1513static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
87f0e418 1514 Socket *s = SOCKET(u);
4f2d528d 1515 int cfd = -1;
9152c765 1516
034c6ed7 1517 assert(s);
8d567588 1518 assert(fd >= 0);
9152c765 1519
871d7de4
LP		 1520 if (s->state != SOCKET_LISTENING)
1521 return;
1522
9e2f7c11 1523 log_debug("Incoming traffic on %s", u->meta.id);
9152c765 1524
4f2d528d
LP		 1525 if (events != EPOLLIN) {
1526 log_error("Got invalid poll event on socket.");
8d567588 1527 goto fail;
4f2d528d
LP		 1528 }
1529
cabab516 1530 if (w->socket_accept) {
4f2d528d
LP		 1531 for (;;) {
1532
1533 if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1534
1535 if (errno == EINTR)
1536 continue;
1537
1538 log_error("Failed to accept socket: %m");
8d567588 1539 goto fail;
4f2d528d
LP		 1540 }
1541
1542 break;
1543 }
4fd5948e
LP		 1544
1545 socket_apply_socket_options(s, cfd);
4f2d528d 1546 }
9152c765 1547
4f2d528d 1548 socket_enter_running(s, cfd);
8d567588
LP		 1549 return;
1550
1551fail:
1552 socket_enter_stop_pre(s, false);
9152c765
LP		 1553}
1554
87f0e418
LP		 1555static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1556 Socket *s = SOCKET(u);
034c6ed7 1557 bool success;
5cb5a6ff
LP		 1558
1559 assert(s);
034c6ed7 1560 assert(pid >= 0);
5cb5a6ff 1561
8c47c732
LP		 1562 if (pid != s->control_pid)
1563 return;
542563ba 1564
034c6ed7
LP		 1565 s->control_pid = 0;
1566
8c47c732 1567 success = is_clean_exit(code, status);
8c47c732 1568
b708e7ce 1569 if (s->control_command) {
b58b4116 1570 exec_status_exit(&s->control_command->exec_status, pid, code, status);
a16e1123 1571
b708e7ce
LP		 1572 if (s->control_command->ignore)
1573 success = true;
1574 }
1575
92abbefb
LP		 1576 log_full(success ? LOG_DEBUG : LOG_NOTICE,
1577 "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
b708e7ce 1578 s->failure = s->failure || !success;
034c6ed7 1579
a16e1123
LP		 1580 if (s->control_command && s->control_command->command_next && success) {
1581 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
034c6ed7 1582 socket_run_next(s, success);
acbb0225 1583 } else {
a16e1123
LP		 1584 s->control_command = NULL;
1585 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1586
034c6ed7
LP		 1587 /* No further commands for this step, so let's figure
1588 * out what to do next */
5cb5a6ff 1589
a16e1123 1590 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
acbb0225 1591
034c6ed7
LP		 1592 switch (s->state) {
1593
1594 case SOCKET_START_PRE:
1595 if (success)
acbb0225 1596 socket_enter_start_post(s);
034c6ed7 1597 else
80876c20 1598 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
034c6ed7
LP		 1599 break;
1600
1601 case SOCKET_START_POST:
1602 if (success)
e9af15c3 1603 socket_enter_listening(s);
034c6ed7
LP		 1604 else
1605 socket_enter_stop_pre(s, false);
1606 break;
1607
1608 case SOCKET_STOP_PRE:
1609 case SOCKET_STOP_PRE_SIGTERM:
1610 case SOCKET_STOP_PRE_SIGKILL:
1611 socket_enter_stop_post(s, success);
1612 break;
1613
1614 case SOCKET_STOP_POST:
80876c20
LP		 1615 case SOCKET_FINAL_SIGTERM:
1616 case SOCKET_FINAL_SIGKILL:
034c6ed7
LP		 1617 socket_enter_dead(s, success);
1618 break;
1619
1620 default:
1621 assert_not_reached("Uh, control process died at wrong time.");
1622 }
1623 }
c4e2ceae
LP		 1624
1625 /* Notify clients about changed exit status */
1626 unit_add_to_dbus_queue(u);
034c6ed7 1627}
5cb5a6ff 1628
acbb0225 1629static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
87f0e418 1630 Socket *s = SOCKET(u);
5cb5a6ff 1631
034c6ed7
LP		 1632 assert(s);
1633 assert(elapsed == 1);
acbb0225 1634 assert(w == &s->timer_watch);
034c6ed7
LP		 1635
1636 switch (s->state) {
1637
1638 case SOCKET_START_PRE:
9e2f7c11 1639 log_warning("%s starting timed out. Terminating.", u->meta.id);
80876c20
LP		 1640 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1641
034c6ed7 1642 case SOCKET_START_POST:
9e2f7c11 1643 log_warning("%s starting timed out. Stopping.", u->meta.id);
034c6ed7
LP		 1644 socket_enter_stop_pre(s, false);
1645 break;
1646
1647 case SOCKET_STOP_PRE:
9e2f7c11 1648 log_warning("%s stopping timed out. Terminating.", u->meta.id);
034c6ed7
LP		 1649 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1650 break;
1651
1652 case SOCKET_STOP_PRE_SIGTERM:
9e2f7c11 1653 log_warning("%s stopping timed out. Killing.", u->meta.id);
034c6ed7
LP		 1654 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1655 break;
1656
1657 case SOCKET_STOP_PRE_SIGKILL:
9e2f7c11 1658 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
034c6ed7
LP		 1659 socket_enter_stop_post(s, false);
1660 break;
1661
1662 case SOCKET_STOP_POST:
9e2f7c11 1663 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
80876c20 1664 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
034c6ed7
LP		 1665 break;
1666
80876c20 1667 case SOCKET_FINAL_SIGTERM:
9e2f7c11 1668 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
80876c20 1669 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
034c6ed7
LP		 1670 break;
1671
80876c20 1672 case SOCKET_FINAL_SIGKILL:
fdf20a31 1673 log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
034c6ed7
LP		 1674 socket_enter_dead(s, false);
1675 break;
1676
1677 default:
1678 assert_not_reached("Timeout at wrong time.");
1679 }
5cb5a6ff
LP		 1680}
1681
44d8db9e
LP		 1682int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1683 int *rfds;
1684 unsigned rn_fds, k;
1685 SocketPort *p;
1686
1687 assert(s);
1688 assert(fds);
1689 assert(n_fds);
1690
1691 /* Called from the service code for requesting our fds */
1692
1693 rn_fds = 0;
1694 LIST_FOREACH(port, p, s->ports)
1695 if (p->fd >= 0)
1696 rn_fds++;
1697
e364ad06 1698 if (!(rfds = new(int, rn_fds)))
44d8db9e
LP		 1699 return -ENOMEM;
1700
1701 k = 0;
1702 LIST_FOREACH(port, p, s->ports)
1703 if (p->fd >= 0)
1704 rfds[k++] = p->fd;
1705
1706 assert(k == rn_fds);
1707
1708 *fds = rfds;
1709 *n_fds = rn_fds;
1710
1711 return 0;
1712}
1713
ceee3d82
LP		 1714void socket_notify_service_dead(Socket *s) {
1715 assert(s);
1716
6cf6bbc2
LP		 1717 /* The service is dead. Dang!
1718 *
1719 * This is strictly for one-instance-for-all-connections
1720 * services. */
ceee3d82
LP		 1721
1722 if (s->state == SOCKET_RUNNING) {
9e2f7c11 1723 log_debug("%s got notified about service death.", s->meta.id);
ceee3d82
LP		 1724 socket_enter_listening(s);
1725 }
1726}
1727
6cf6bbc2
LP		 1728void socket_connection_unref(Socket *s) {
1729 assert(s);
1730
1731 /* The service is dead. Yay!
1732 *
1733 * This is strictly for one-onstance-per-connection
1734 * services. */
1735
1736 assert(s->n_connections > 0);
1737 s->n_connections--;
1738
1739 log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1740}
1741
fdf20a31 1742static void socket_reset_failed(Unit *u) {
5632e374
LP		 1743 Socket *s = SOCKET(u);
1744
1745 assert(s);
1746
fdf20a31 1747 if (s->state == SOCKET_FAILED)
5632e374
LP		 1748 socket_set_state(s, SOCKET_DEAD);
1749
1750 s->failure = false;
1751}
1752
a16e1123
LP		 1753static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1754 [SOCKET_DEAD] = "dead",
1755 [SOCKET_START_PRE] = "start-pre",
1756 [SOCKET_START_POST] = "start-post",
1757 [SOCKET_LISTENING] = "listening",
1758 [SOCKET_RUNNING] = "running",
1759 [SOCKET_STOP_PRE] = "stop-pre",
1760 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1761 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1762 [SOCKET_STOP_POST] = "stop-post",
1763 [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1764 [SOCKET_FINAL_SIGKILL] = "final-sigkill",
fdf20a31 1765 [SOCKET_FAILED] = "failed"
a16e1123
LP		 1766};
1767
1768DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1769
1770static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1771 [SOCKET_EXEC_START_PRE] = "StartPre",
1772 [SOCKET_EXEC_START_POST] = "StartPost",
1773 [SOCKET_EXEC_STOP_PRE] = "StopPre",
1774 [SOCKET_EXEC_STOP_POST] = "StopPost"
1775};
1776
1777DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1778
87f0e418 1779const UnitVTable socket_vtable = {
5cb5a6ff
LP		 1780 .suffix = ".socket",
1781
034c6ed7
LP		 1782 .init = socket_init,
1783 .done = socket_done,
a16e1123
LP		 1784 .load = socket_load,
1785
1786 .coldplug = socket_coldplug,
034c6ed7 1787
5cb5a6ff
LP		 1788 .dump = socket_dump,
1789
542563ba
LP		 1790 .start = socket_start,
1791 .stop = socket_stop,
5cb5a6ff 1792
a16e1123
LP		 1793 .serialize = socket_serialize,
1794 .deserialize_item = socket_deserialize_item,
1795
5cb5a6ff 1796 .active_state = socket_active_state,
10a94420 1797 .sub_state_to_string = socket_sub_state_to_string,
5cb5a6ff 1798
6cf6bbc2
LP		 1799 .check_gc = socket_check_gc,
1800
9152c765 1801 .fd_event = socket_fd_event,
034c6ed7 1802 .sigchld_event = socket_sigchld_event,
4139c1b2
LP		 1803 .timer_event = socket_timer_event,
1804
fdf20a31 1805 .reset_failed = socket_reset_failed,
5632e374 1806
c4e2ceae
LP		 1807 .bus_interface = "org.freedesktop.systemd1.Socket",
1808 .bus_message_handler = bus_socket_message_handler,
1809 .bus_invalidating_properties = bus_socket_invalidating_properties
5cb5a6ff 1810};
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