1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
22 #include <sys/types.h>
27 #include <sys/epoll.h>
29 #include <arpa/inet.h>
34 #include "load-dropin.h"
35 #include "load-fragment.h"
37 #include "unit-name.h"
38 #include "dbus-socket.h"
41 #include "bus-errors.h"
43 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
44 [SOCKET_DEAD] = UNIT_INACTIVE,
45 [SOCKET_START_PRE] = UNIT_ACTIVATING,
46 [SOCKET_START_POST] = UNIT_ACTIVATING,
47 [SOCKET_LISTENING] = UNIT_ACTIVE,
48 [SOCKET_RUNNING] = UNIT_ACTIVE,
49 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
50 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
51 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
52 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
53 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
54 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
55 [SOCKET_MAINTENANCE] = UNIT_MAINTENANCE
58 static void socket_init(Unit *u) {
59 Socket *s = SOCKET(u);
62 assert(u->meta.load_state == UNIT_STUB);
64 s->backlog = SOMAXCONN;
65 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
66 s->directory_mode = 0755;
67 s->socket_mode = 0666;
69 s->max_connections = 64;
76 exec_context_init(&s->exec_context);
78 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
81 static void socket_unwatch_control_pid(Socket *s) {
84 if (s->control_pid <= 0)
87 unit_unwatch_pid(UNIT(s), s->control_pid);
91 static void socket_done(Unit *u) {
92 Socket *s = SOCKET(u);
98 while ((p = s->ports)) {
99 LIST_REMOVE(SocketPort, port, s->ports, p);
102 unit_unwatch_fd(UNIT(s), &p->fd_watch);
103 close_nointr_nofail(p->fd);
110 exec_context_done(&s->exec_context);
111 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
112 s->control_command = NULL;
114 socket_unwatch_control_pid(s);
118 free(s->bind_to_device);
119 s->bind_to_device = NULL;
121 unit_unwatch_timer(u, &s->timer_watch);
123 /* Make sure no service instance refers to us anymore. */
124 LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
125 Service *service = (Service *) i;
127 if (service->socket == s)
128 service->socket = NULL;
132 static bool have_non_accept_socket(Socket *s) {
140 LIST_FOREACH(port, p, s->ports) {
142 if (p->type != SOCKET_SOCKET)
145 if (!socket_address_can_accept(&p->address))
152 static int socket_verify(Socket *s) {
155 if (s->meta.load_state != UNIT_LOADED)
159 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
163 if (s->accept && s->max_connections <= 0) {
164 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
168 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
169 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
176 static bool socket_needs_mount(Socket *s, const char *prefix) {
181 LIST_FOREACH(port, p, s->ports) {
183 if (p->type == SOCKET_SOCKET) {
184 if (socket_address_needs_mount(&p->address, prefix))
187 assert(p->type == SOCKET_FIFO);
188 if (path_startswith(p->path, prefix))
196 int socket_add_one_mount_link(Socket *s, Mount *m) {
202 if (s->meta.load_state != UNIT_LOADED ||
203 m->meta.load_state != UNIT_LOADED)
206 if (!socket_needs_mount(s, m->where))
209 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
215 static int socket_add_mount_links(Socket *s) {
221 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
222 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
228 static int socket_add_device_link(Socket *s) {
234 if (!s->bind_to_device)
237 if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
240 r = unit_add_node_link(UNIT(s), t, false);
246 static int socket_add_default_dependencies(Socket *s) {
250 if (s->meta.manager->running_as == MANAGER_SYSTEM)
251 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
254 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
257 static int socket_load(Unit *u) {
258 Socket *s = SOCKET(u);
262 assert(u->meta.load_state == UNIT_STUB);
264 if ((r = unit_load_fragment_and_dropin(u)) < 0)
267 /* This is a new unit? Then let's add in some extras */
268 if (u->meta.load_state == UNIT_LOADED) {
270 if (have_non_accept_socket(s)) {
271 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
274 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
278 if ((r = socket_add_mount_links(s)) < 0)
281 if ((r = socket_add_device_link(s)) < 0)
284 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
287 if ((r = unit_add_default_cgroup(u)) < 0)
290 if (s->meta.default_dependencies)
291 if ((r = socket_add_default_dependencies(s)) < 0)
295 return socket_verify(s);
298 static const char* listen_lookup(int type) {
300 if (type == SOCK_STREAM)
301 return "ListenStream";
302 else if (type == SOCK_DGRAM)
303 return "ListenDatagram";
304 else if (type == SOCK_SEQPACKET)
305 return "ListenSequentialPacket";
307 assert_not_reached("Unknown socket type");
311 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
314 Socket *s = SOCKET(u);
322 p2 = strappend(prefix, "\t");
323 prefix2 = p2 ? p2 : prefix;
326 "%sSocket State: %s\n"
327 "%sBindIPv6Only: %s\n"
329 "%sSocketMode: %04o\n"
330 "%sDirectoryMode: %04o\n"
333 prefix, socket_state_to_string(s->state),
334 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
336 prefix, s->socket_mode,
337 prefix, s->directory_mode,
338 prefix, yes_no(s->keep_alive),
339 prefix, yes_no(s->free_bind));
341 if (s->control_pid > 0)
343 "%sControl PID: %lu\n",
344 prefix, (unsigned long) s->control_pid);
346 if (s->bind_to_device)
348 "%sBindToDevice: %s\n",
349 prefix, s->bind_to_device);
354 "%sNConnections: %u\n"
355 "%sMaxConnections: %u\n",
356 prefix, s->n_accepted,
357 prefix, s->n_connections,
358 prefix, s->max_connections);
360 if (s->priority >= 0)
363 prefix, s->priority);
365 if (s->receive_buffer > 0)
367 "%sReceiveBuffer: %zu\n",
368 prefix, s->receive_buffer);
370 if (s->send_buffer > 0)
372 "%sSendBuffer: %zu\n",
373 prefix, s->send_buffer);
385 if (s->pipe_size > 0)
388 prefix, s->pipe_size);
395 LIST_FOREACH(port, p, s->ports) {
397 if (p->type == SOCKET_SOCKET) {
402 if ((r = socket_address_print(&p->address, &k)) < 0)
407 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
410 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
413 exec_context_dump(&s->exec_context, f, prefix);
415 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
416 if (!s->exec_command[c])
419 fprintf(f, "%s-> %s:\n",
420 prefix, socket_exec_command_to_string(c));
422 exec_command_dump_list(s->exec_command[c], f, prefix2);
428 static int instance_from_socket(int fd, unsigned nr, char **instance) {
433 struct sockaddr_un un;
434 struct sockaddr_in in;
435 struct sockaddr_in6 in6;
436 struct sockaddr_storage storage;
443 if (getsockname(fd, &local.sa, &l) < 0)
447 if (getpeername(fd, &remote.sa, &l) < 0)
450 switch (local.sa.sa_family) {
454 a = ntohl(local.in.sin_addr.s_addr),
455 b = ntohl(remote.in.sin_addr.s_addr);
458 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
460 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
461 ntohs(local.in.sin_port),
462 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
463 ntohs(remote.in.sin_port)) < 0)
470 static const char ipv4_prefix[] = {
471 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
474 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
475 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
477 *a = local.in6.sin6_addr.s6_addr+12,
478 *b = remote.in6.sin6_addr.s6_addr+12;
481 "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
483 a[0], a[1], a[2], a[3],
484 ntohs(local.in6.sin6_port),
485 b[0], b[1], b[2], b[3],
486 ntohs(remote.in6.sin6_port)) < 0)
489 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
494 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
495 ntohs(local.in6.sin6_port),
496 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
497 ntohs(remote.in6.sin6_port)) < 0)
508 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
514 (unsigned long) ucred.pid,
515 (unsigned long) ucred.uid) < 0)
522 assert_not_reached("Unhandled socket type.");
529 static void socket_close_fds(Socket *s) {
534 LIST_FOREACH(port, p, s->ports) {
538 unit_unwatch_fd(UNIT(s), &p->fd_watch);
539 close_nointr_nofail(p->fd);
541 /* One little note: we should never delete any sockets
542 * in the file system here! After all some other
543 * process we spawned might still have a reference of
544 * this fd and wants to continue to use it. Therefore
545 * we delete sockets in the file system before we
546 * create a new one, not after we stopped using
553 static void socket_apply_socket_options(Socket *s, int fd) {
558 int b = s->keep_alive;
559 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
560 log_warning("SO_KEEPALIVE failed: %m");
563 if (s->priority >= 0)
564 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
565 log_warning("SO_PRIORITY failed: %m");
567 if (s->receive_buffer > 0) {
568 int value = (int) s->receive_buffer;
569 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
570 log_warning("SO_RCVBUF failed: %m");
573 if (s->send_buffer > 0) {
574 int value = (int) s->send_buffer;
575 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
576 log_warning("SO_SNDBUF failed: %m");
580 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
581 log_warning("SO_MARK failed: %m");
584 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
585 log_warning("IP_TOS failed: %m");
587 if (s->ip_ttl >= 0) {
590 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
591 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
594 log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
598 static void socket_apply_pipe_options(Socket *s, int fd) {
602 if (s->pipe_size > 0)
603 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
604 log_warning("F_SETPIPE_SZ: %m");
607 static int socket_open_fds(Socket *s) {
613 LIST_FOREACH(port, p, s->ports) {
618 if (p->type == SOCKET_SOCKET) {
620 if ((r = socket_address_listen(
631 socket_apply_socket_options(s, p->fd);
635 assert(p->type == SOCKET_FIFO);
637 mkdir_parents(p->path, s->directory_mode);
639 if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
644 if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
649 if (fstat(p->fd, &st) < 0) {
654 /* FIXME verify user, access mode */
656 if (!S_ISFIFO(st.st_mode)) {
661 socket_apply_pipe_options(s, p->fd);
672 static void socket_unwatch_fds(Socket *s) {
677 LIST_FOREACH(port, p, s->ports) {
681 unit_unwatch_fd(UNIT(s), &p->fd_watch);
685 static int socket_watch_fds(Socket *s) {
691 LIST_FOREACH(port, p, s->ports) {
695 p->fd_watch.socket_accept =
697 p->type == SOCKET_SOCKET &&
698 socket_address_can_accept(&p->address);
700 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
707 socket_unwatch_fds(s);
711 static void socket_set_state(Socket *s, SocketState state) {
712 SocketState old_state;
715 old_state = s->state;
718 if (state != SOCKET_START_PRE &&
719 state != SOCKET_START_POST &&
720 state != SOCKET_STOP_PRE &&
721 state != SOCKET_STOP_PRE_SIGTERM &&
722 state != SOCKET_STOP_PRE_SIGKILL &&
723 state != SOCKET_STOP_POST &&
724 state != SOCKET_FINAL_SIGTERM &&
725 state != SOCKET_FINAL_SIGKILL) {
726 unit_unwatch_timer(UNIT(s), &s->timer_watch);
727 socket_unwatch_control_pid(s);
728 s->control_command = NULL;
729 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
732 if (state != SOCKET_LISTENING)
733 socket_unwatch_fds(s);
735 if (state != SOCKET_START_POST &&
736 state != SOCKET_LISTENING &&
737 state != SOCKET_RUNNING &&
738 state != SOCKET_STOP_PRE &&
739 state != SOCKET_STOP_PRE_SIGTERM &&
740 state != SOCKET_STOP_PRE_SIGKILL)
743 if (state != old_state)
744 log_debug("%s changed %s -> %s",
746 socket_state_to_string(old_state),
747 socket_state_to_string(state));
749 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
752 static int socket_coldplug(Unit *u) {
753 Socket *s = SOCKET(u);
757 assert(s->state == SOCKET_DEAD);
759 if (s->deserialized_state != s->state) {
761 if (s->deserialized_state == SOCKET_START_PRE ||
762 s->deserialized_state == SOCKET_START_POST ||
763 s->deserialized_state == SOCKET_STOP_PRE ||
764 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
765 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
766 s->deserialized_state == SOCKET_STOP_POST ||
767 s->deserialized_state == SOCKET_FINAL_SIGTERM ||
768 s->deserialized_state == SOCKET_FINAL_SIGKILL) {
770 if (s->control_pid <= 0)
773 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
776 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
780 if (s->deserialized_state == SOCKET_START_POST ||
781 s->deserialized_state == SOCKET_LISTENING ||
782 s->deserialized_state == SOCKET_RUNNING ||
783 s->deserialized_state == SOCKET_STOP_PRE ||
784 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
785 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
786 if ((r = socket_open_fds(s)) < 0)
789 if (s->deserialized_state == SOCKET_LISTENING)
790 if ((r = socket_watch_fds(s)) < 0)
793 socket_set_state(s, s->deserialized_state);
799 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
808 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
811 if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
820 s->meta.manager->environment,
824 s->meta.manager->confirm_spawn,
825 s->meta.cgroup_bondings,
832 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
833 /* FIXME: we need to do something here */
841 unit_unwatch_timer(UNIT(s), &s->timer_watch);
846 static void socket_enter_dead(Socket *s, bool success) {
852 socket_set_state(s, s->failure ? SOCKET_MAINTENANCE : SOCKET_DEAD);
855 static void socket_enter_signal(Socket *s, SocketState state, bool success);
857 static void socket_enter_stop_post(Socket *s, bool success) {
864 socket_unwatch_control_pid(s);
866 s->control_command_id = SOCKET_EXEC_STOP_POST;
868 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
869 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
872 socket_set_state(s, SOCKET_STOP_POST);
874 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
879 log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
880 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
883 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
892 if (s->exec_context.kill_mode != KILL_NONE) {
893 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
895 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
897 if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
898 if (r != -EAGAIN && r != -ESRCH)
904 if (!sent && s->control_pid > 0)
905 if (kill(s->exec_context.kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
911 if (sent && s->control_pid > 0) {
912 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
915 socket_set_state(s, state);
916 } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
917 socket_enter_stop_post(s, true);
919 socket_enter_dead(s, true);
924 log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
926 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
927 socket_enter_stop_post(s, false);
929 socket_enter_dead(s, false);
932 static void socket_enter_stop_pre(Socket *s, bool success) {
939 socket_unwatch_control_pid(s);
941 s->control_command_id = SOCKET_EXEC_STOP_PRE;
943 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
944 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
947 socket_set_state(s, SOCKET_STOP_PRE);
949 socket_enter_stop_post(s, true);
954 log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
955 socket_enter_stop_post(s, false);
958 static void socket_enter_listening(Socket *s) {
962 if ((r = socket_watch_fds(s)) < 0) {
963 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
967 socket_set_state(s, SOCKET_LISTENING);
971 socket_enter_stop_pre(s, false);
974 static void socket_enter_start_post(Socket *s) {
978 if ((r = socket_open_fds(s)) < 0) {
979 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
983 socket_unwatch_control_pid(s);
985 s->control_command_id = SOCKET_EXEC_START_POST;
987 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
988 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
989 log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
993 socket_set_state(s, SOCKET_START_POST);
995 socket_enter_listening(s);
1000 socket_enter_stop_pre(s, false);
1003 static void socket_enter_start_pre(Socket *s) {
1007 socket_unwatch_control_pid(s);
1009 s->control_command_id = SOCKET_EXEC_START_PRE;
1011 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1012 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1015 socket_set_state(s, SOCKET_START_PRE);
1017 socket_enter_start_post(s);
1022 log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1023 socket_enter_dead(s, false);
1026 static void socket_enter_running(Socket *s, int cfd) {
1031 dbus_error_init(&error);
1033 /* We don't take connections anymore if we are supposed to
1034 * shut down anyway */
1035 if (s->meta.job && s->meta.job->type == JOB_STOP) {
1036 close_nointr_nofail(cfd);
1041 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1044 socket_set_state(s, SOCKET_RUNNING);
1047 char *prefix, *instance = NULL, *name;
1049 if (s->n_connections >= s->max_connections) {
1050 log_warning("Too many incoming connections (%u)", s->n_connections);
1051 close_nointr_nofail(cfd);
1055 if ((r = instance_from_socket(cfd, s->n_accepted++, &instance)) < 0)
1058 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1064 name = unit_name_build(prefix, instance, ".service");
1073 r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
1079 if ((r = service_set_socket_fd(SERVICE(u), cfd, s)) < 0)
1084 s->n_connections ++;
1086 if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, &error, NULL)) < 0)
1093 log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1094 socket_enter_stop_pre(s, false);
1097 close_nointr_nofail(cfd);
1099 dbus_error_free(&error);
1102 static void socket_run_next(Socket *s, bool success) {
1106 assert(s->control_command);
1107 assert(s->control_command->command_next);
1112 socket_unwatch_control_pid(s);
1114 s->control_command = s->control_command->command_next;
1116 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1122 log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1124 if (s->state == SOCKET_START_POST)
1125 socket_enter_stop_pre(s, false);
1126 else if (s->state == SOCKET_STOP_POST)
1127 socket_enter_dead(s, false);
1129 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1132 static int socket_start(Unit *u) {
1133 Socket *s = SOCKET(u);
1137 /* We cannot fulfill this request right now, try again later
1139 if (s->state == SOCKET_STOP_PRE ||
1140 s->state == SOCKET_STOP_PRE_SIGKILL ||
1141 s->state == SOCKET_STOP_PRE_SIGTERM ||
1142 s->state == SOCKET_STOP_POST ||
1143 s->state == SOCKET_FINAL_SIGTERM ||
1144 s->state == SOCKET_FINAL_SIGKILL)
1147 if (s->state == SOCKET_START_PRE ||
1148 s->state == SOCKET_START_POST)
1151 /* Cannot run this without the service being around */
1153 if (s->service->meta.load_state != UNIT_LOADED)
1156 /* If the service is alredy actvie we cannot start the
1158 if (s->service->state != SERVICE_DEAD &&
1159 s->service->state != SERVICE_MAINTENANCE &&
1160 s->service->state != SERVICE_AUTO_RESTART)
1164 assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTENANCE);
1167 socket_enter_start_pre(s);
1171 static int socket_stop(Unit *u) {
1172 Socket *s = SOCKET(u);
1177 if (s->state == SOCKET_STOP_PRE ||
1178 s->state == SOCKET_STOP_PRE_SIGTERM ||
1179 s->state == SOCKET_STOP_PRE_SIGKILL ||
1180 s->state == SOCKET_STOP_POST ||
1181 s->state == SOCKET_FINAL_SIGTERM ||
1182 s->state == SOCKET_FINAL_SIGKILL)
1185 /* If there's already something running we go directly into
1187 if (s->state == SOCKET_START_PRE ||
1188 s->state == SOCKET_START_POST) {
1189 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1193 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1195 socket_enter_stop_pre(s, true);
1199 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1200 Socket *s = SOCKET(u);
1208 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1209 unit_serialize_item(u, f, "failure", yes_no(s->failure));
1210 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1212 if (s->control_pid > 0)
1213 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1215 if (s->control_command_id >= 0)
1216 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1218 LIST_FOREACH(port, p, s->ports) {
1224 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1227 if (p->type == SOCKET_SOCKET) {
1230 if ((r = socket_address_print(&p->address, &t)) < 0)
1233 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1236 assert(p->type == SOCKET_FIFO);
1237 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1244 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1245 Socket *s = SOCKET(u);
1253 if (streq(key, "state")) {
1256 if ((state = socket_state_from_string(value)) < 0)
1257 log_debug("Failed to parse state value %s", value);
1259 s->deserialized_state = state;
1260 } else if (streq(key, "failure")) {
1263 if ((b = parse_boolean(value)) < 0)
1264 log_debug("Failed to parse failure value %s", value);
1266 s->failure = b || s->failure;
1268 } else if (streq(key, "n-accepted")) {
1271 if ((r = safe_atou(value, &k)) < 0)
1272 log_debug("Failed to parse n-accepted value %s", value);
1275 } else if (streq(key, "control-pid")) {
1278 if ((r = parse_pid(value, &pid)) < 0)
1279 log_debug("Failed to parse control-pid value %s", value);
1281 s->control_pid = pid;
1282 } else if (streq(key, "control-command")) {
1283 SocketExecCommand id;
1285 if ((id = socket_exec_command_from_string(value)) < 0)
1286 log_debug("Failed to parse exec-command value %s", value);
1288 s->control_command_id = id;
1289 s->control_command = s->exec_command[id];
1291 } else if (streq(key, "fifo")) {
1295 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1296 log_debug("Failed to parse fifo value %s", value);
1299 LIST_FOREACH(port, p, s->ports)
1300 if (streq(p->path, value+skip))
1305 close_nointr_nofail(p->fd);
1306 p->fd = fdset_remove(fds, fd);
1310 } else if (streq(key, "socket")) {
1311 int fd, type, skip = 0;
1314 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1315 log_debug("Failed to parse socket value %s", value);
1318 LIST_FOREACH(port, p, s->ports)
1319 if (socket_address_is(&p->address, value+skip, type))
1324 close_nointr_nofail(p->fd);
1325 p->fd = fdset_remove(fds, fd);
1330 log_debug("Unknown serialization key '%s'", key);
1335 static UnitActiveState socket_active_state(Unit *u) {
1338 return state_translation_table[SOCKET(u)->state];
1341 static const char *socket_sub_state_to_string(Unit *u) {
1344 return socket_state_to_string(SOCKET(u)->state);
1347 static bool socket_check_gc(Unit *u) {
1348 Socket *s = SOCKET(u);
1352 return s->n_connections > 0;
1355 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1356 Socket *s = SOCKET(u);
1362 if (s->state != SOCKET_LISTENING)
1365 log_debug("Incoming traffic on %s", u->meta.id);
1367 if (events != EPOLLIN) {
1368 log_error("Got invalid poll event on socket.");
1372 if (w->socket_accept) {
1375 if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1380 log_error("Failed to accept socket: %m");
1387 socket_apply_socket_options(s, cfd);
1390 socket_enter_running(s, cfd);
1394 socket_enter_stop_pre(s, false);
1397 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1398 Socket *s = SOCKET(u);
1404 if (pid != s->control_pid)
1409 success = is_clean_exit(code, status);
1411 if (s->control_command) {
1412 exec_status_exit(&s->control_command->exec_status, pid, code, status);
1414 if (s->control_command->ignore)
1418 log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1419 s->failure = s->failure || !success;
1421 if (s->control_command && s->control_command->command_next && success) {
1422 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1423 socket_run_next(s, success);
1425 s->control_command = NULL;
1426 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1428 /* No further commands for this step, so let's figure
1429 * out what to do next */
1431 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1435 case SOCKET_START_PRE:
1437 socket_enter_start_post(s);
1439 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1442 case SOCKET_START_POST:
1444 socket_enter_listening(s);
1446 socket_enter_stop_pre(s, false);
1449 case SOCKET_STOP_PRE:
1450 case SOCKET_STOP_PRE_SIGTERM:
1451 case SOCKET_STOP_PRE_SIGKILL:
1452 socket_enter_stop_post(s, success);
1455 case SOCKET_STOP_POST:
1456 case SOCKET_FINAL_SIGTERM:
1457 case SOCKET_FINAL_SIGKILL:
1458 socket_enter_dead(s, success);
1462 assert_not_reached("Uh, control process died at wrong time.");
1467 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1468 Socket *s = SOCKET(u);
1471 assert(elapsed == 1);
1472 assert(w == &s->timer_watch);
1476 case SOCKET_START_PRE:
1477 log_warning("%s starting timed out. Terminating.", u->meta.id);
1478 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1480 case SOCKET_START_POST:
1481 log_warning("%s starting timed out. Stopping.", u->meta.id);
1482 socket_enter_stop_pre(s, false);
1485 case SOCKET_STOP_PRE:
1486 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1487 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1490 case SOCKET_STOP_PRE_SIGTERM:
1491 log_warning("%s stopping timed out. Killing.", u->meta.id);
1492 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1495 case SOCKET_STOP_PRE_SIGKILL:
1496 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1497 socket_enter_stop_post(s, false);
1500 case SOCKET_STOP_POST:
1501 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1502 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1505 case SOCKET_FINAL_SIGTERM:
1506 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1507 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1510 case SOCKET_FINAL_SIGKILL:
1511 log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
1512 socket_enter_dead(s, false);
1516 assert_not_reached("Timeout at wrong time.");
1520 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1529 /* Called from the service code for requesting our fds */
1532 LIST_FOREACH(port, p, s->ports)
1536 if (!(rfds = new(int, rn_fds)) < 0)
1540 LIST_FOREACH(port, p, s->ports)
1544 assert(k == rn_fds);
1552 void socket_notify_service_dead(Socket *s) {
1555 /* The service is dead. Dang!
1557 * This is strictly for one-instance-for-all-connections
1560 if (s->state == SOCKET_RUNNING) {
1561 log_debug("%s got notified about service death.", s->meta.id);
1562 socket_enter_listening(s);
1566 void socket_connection_unref(Socket *s) {
1569 /* The service is dead. Yay!
1571 * This is strictly for one-onstance-per-connection
1574 assert(s->n_connections > 0);
1577 log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1580 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1581 [SOCKET_DEAD] = "dead",
1582 [SOCKET_START_PRE] = "start-pre",
1583 [SOCKET_START_POST] = "start-post",
1584 [SOCKET_LISTENING] = "listening",
1585 [SOCKET_RUNNING] = "running",
1586 [SOCKET_STOP_PRE] = "stop-pre",
1587 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1588 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1589 [SOCKET_STOP_POST] = "stop-post",
1590 [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1591 [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1592 [SOCKET_MAINTENANCE] = "maintenance"
1595 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1597 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1598 [SOCKET_EXEC_START_PRE] = "StartPre",
1599 [SOCKET_EXEC_START_POST] = "StartPost",
1600 [SOCKET_EXEC_STOP_PRE] = "StopPre",
1601 [SOCKET_EXEC_STOP_POST] = "StopPost"
1604 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1606 const UnitVTable socket_vtable = {
1607 .suffix = ".socket",
1609 .init = socket_init,
1610 .done = socket_done,
1611 .load = socket_load,
1613 .coldplug = socket_coldplug,
1615 .dump = socket_dump,
1617 .start = socket_start,
1618 .stop = socket_stop,
1620 .serialize = socket_serialize,
1621 .deserialize_item = socket_deserialize_item,
1623 .active_state = socket_active_state,
1624 .sub_state_to_string = socket_sub_state_to_string,
1626 .check_gc = socket_check_gc,
1628 .fd_event = socket_fd_event,
1629 .sigchld_event = socket_sigchld_event,
1630 .timer_event = socket_timer_event,
1632 .bus_message_handler = bus_socket_message_handler