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>
33 #include "netinet/tcp.h"
35 #include "load-dropin.h"
36 #include "load-fragment.h"
38 #include "unit-name.h"
39 #include "dbus-socket.h"
42 #include "bus-errors.h"
44 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
45 [SOCKET_DEAD] = UNIT_INACTIVE,
46 [SOCKET_START_PRE] = UNIT_ACTIVATING,
47 [SOCKET_START_POST] = UNIT_ACTIVATING,
48 [SOCKET_LISTENING] = UNIT_ACTIVE,
49 [SOCKET_RUNNING] = UNIT_ACTIVE,
50 [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
51 [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
52 [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
53 [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
54 [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
55 [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
56 [SOCKET_MAINTENANCE] = UNIT_MAINTENANCE
59 static void socket_init(Unit *u) {
60 Socket *s = SOCKET(u);
63 assert(u->meta.load_state == UNIT_STUB);
65 s->backlog = SOMAXCONN;
66 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
67 s->directory_mode = 0755;
68 s->socket_mode = 0666;
70 s->max_connections = 64;
77 exec_context_init(&s->exec_context);
79 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
82 static void socket_unwatch_control_pid(Socket *s) {
85 if (s->control_pid <= 0)
88 unit_unwatch_pid(UNIT(s), s->control_pid);
92 static void socket_done(Unit *u) {
93 Socket *s = SOCKET(u);
99 while ((p = s->ports)) {
100 LIST_REMOVE(SocketPort, port, s->ports, p);
103 unit_unwatch_fd(UNIT(s), &p->fd_watch);
104 close_nointr_nofail(p->fd);
111 exec_context_done(&s->exec_context);
112 exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
113 s->control_command = NULL;
115 socket_unwatch_control_pid(s);
119 free(s->tcp_congestion);
120 s->tcp_congestion = NULL;
122 free(s->bind_to_device);
123 s->bind_to_device = NULL;
125 unit_unwatch_timer(u, &s->timer_watch);
127 /* Make sure no service instance refers to us anymore. */
128 LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
129 Service *service = (Service *) i;
131 if (service->socket == s)
132 service->socket = NULL;
136 static int socket_instantiate_service(Socket *s) {
143 /* This fills in s->service if it isn't filled in yet. For
144 * Accept=yes sockets we create the next connection service
145 * here. For Accept=no this is mostly a NOP since the service
146 * is figured out at load time anyway. */
153 if (!(prefix = unit_name_to_prefix(s->meta.id)))
156 r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
162 r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
168 s->service = SERVICE(u);
172 static bool have_non_accept_socket(Socket *s) {
180 LIST_FOREACH(port, p, s->ports) {
182 if (p->type != SOCKET_SOCKET)
185 if (!socket_address_can_accept(&p->address))
192 static int socket_verify(Socket *s) {
195 if (s->meta.load_state != UNIT_LOADED)
199 log_error("%s lacks Listen setting. Refusing.", s->meta.id);
203 if (s->accept && have_non_accept_socket(s)) {
204 log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
208 if (s->accept && s->max_connections <= 0) {
209 log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
213 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
214 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
221 static bool socket_needs_mount(Socket *s, const char *prefix) {
226 LIST_FOREACH(port, p, s->ports) {
228 if (p->type == SOCKET_SOCKET) {
229 if (socket_address_needs_mount(&p->address, prefix))
232 assert(p->type == SOCKET_FIFO);
233 if (path_startswith(p->path, prefix))
241 int socket_add_one_mount_link(Socket *s, Mount *m) {
247 if (s->meta.load_state != UNIT_LOADED ||
248 m->meta.load_state != UNIT_LOADED)
251 if (!socket_needs_mount(s, m->where))
254 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
260 static int socket_add_mount_links(Socket *s) {
266 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
267 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
273 static int socket_add_device_link(Socket *s) {
279 if (!s->bind_to_device)
282 if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
285 r = unit_add_node_link(UNIT(s), t, false);
291 static int socket_add_default_dependencies(Socket *s) {
295 if (s->meta.manager->running_as == MANAGER_SYSTEM)
296 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
299 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
302 static int socket_load(Unit *u) {
303 Socket *s = SOCKET(u);
307 assert(u->meta.load_state == UNIT_STUB);
309 if ((r = unit_load_fragment_and_dropin(u)) < 0)
312 /* This is a new unit? Then let's add in some extras */
313 if (u->meta.load_state == UNIT_LOADED) {
315 if (have_non_accept_socket(s)) {
316 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
319 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
323 if ((r = socket_add_mount_links(s)) < 0)
326 if ((r = socket_add_device_link(s)) < 0)
329 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
332 if ((r = unit_add_default_cgroup(u)) < 0)
335 if (s->meta.default_dependencies)
336 if ((r = socket_add_default_dependencies(s)) < 0)
340 return socket_verify(s);
343 static const char* listen_lookup(int type) {
345 if (type == SOCK_STREAM)
346 return "ListenStream";
347 else if (type == SOCK_DGRAM)
348 return "ListenDatagram";
349 else if (type == SOCK_SEQPACKET)
350 return "ListenSequentialPacket";
352 assert_not_reached("Unknown socket type");
356 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
359 Socket *s = SOCKET(u);
367 p2 = strappend(prefix, "\t");
368 prefix2 = p2 ? p2 : prefix;
371 "%sSocket State: %s\n"
372 "%sBindIPv6Only: %s\n"
374 "%sSocketMode: %04o\n"
375 "%sDirectoryMode: %04o\n"
378 "%sTCPCongestion: %s\n",
379 prefix, socket_state_to_string(s->state),
380 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
382 prefix, s->socket_mode,
383 prefix, s->directory_mode,
384 prefix, yes_no(s->keep_alive),
385 prefix, yes_no(s->free_bind),
386 prefix, s->tcp_congestion);
388 if (s->control_pid > 0)
390 "%sControl PID: %lu\n",
391 prefix, (unsigned long) s->control_pid);
393 if (s->bind_to_device)
395 "%sBindToDevice: %s\n",
396 prefix, s->bind_to_device);
401 "%sNConnections: %u\n"
402 "%sMaxConnections: %u\n",
403 prefix, s->n_accepted,
404 prefix, s->n_connections,
405 prefix, s->max_connections);
407 if (s->priority >= 0)
410 prefix, s->priority);
412 if (s->receive_buffer > 0)
414 "%sReceiveBuffer: %zu\n",
415 prefix, s->receive_buffer);
417 if (s->send_buffer > 0)
419 "%sSendBuffer: %zu\n",
420 prefix, s->send_buffer);
432 if (s->pipe_size > 0)
435 prefix, s->pipe_size);
442 LIST_FOREACH(port, p, s->ports) {
444 if (p->type == SOCKET_SOCKET) {
449 if ((r = socket_address_print(&p->address, &k)) < 0)
454 fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
457 fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
460 exec_context_dump(&s->exec_context, f, prefix);
462 for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
463 if (!s->exec_command[c])
466 fprintf(f, "%s-> %s:\n",
467 prefix, socket_exec_command_to_string(c));
469 exec_command_dump_list(s->exec_command[c], f, prefix2);
475 static int instance_from_socket(int fd, unsigned nr, char **instance) {
480 struct sockaddr_un un;
481 struct sockaddr_in in;
482 struct sockaddr_in6 in6;
483 struct sockaddr_storage storage;
490 if (getsockname(fd, &local.sa, &l) < 0)
494 if (getpeername(fd, &remote.sa, &l) < 0)
497 switch (local.sa.sa_family) {
501 a = ntohl(local.in.sin_addr.s_addr),
502 b = ntohl(remote.in.sin_addr.s_addr);
505 "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
506 a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
507 ntohs(local.in.sin_port),
508 b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
509 ntohs(remote.in.sin_port)) < 0)
516 static const char ipv4_prefix[] = {
517 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
520 if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
521 memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
523 *a = local.in6.sin6_addr.s6_addr+12,
524 *b = remote.in6.sin6_addr.s6_addr+12;
527 "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
528 a[0], a[1], a[2], a[3],
529 ntohs(local.in6.sin6_port),
530 b[0], b[1], b[2], b[3],
531 ntohs(remote.in6.sin6_port)) < 0)
534 char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
538 inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
539 ntohs(local.in6.sin6_port),
540 inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
541 ntohs(remote.in6.sin6_port)) < 0)
552 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
558 (unsigned long) ucred.pid,
559 (unsigned long) ucred.uid) < 0)
566 assert_not_reached("Unhandled socket type.");
573 static void socket_close_fds(Socket *s) {
578 LIST_FOREACH(port, p, s->ports) {
582 unit_unwatch_fd(UNIT(s), &p->fd_watch);
583 close_nointr_nofail(p->fd);
585 /* One little note: we should never delete any sockets
586 * in the file system here! After all some other
587 * process we spawned might still have a reference of
588 * this fd and wants to continue to use it. Therefore
589 * we delete sockets in the file system before we
590 * create a new one, not after we stopped using
597 static void socket_apply_socket_options(Socket *s, int fd) {
602 int b = s->keep_alive;
603 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
604 log_warning("SO_KEEPALIVE failed: %m");
607 if (s->priority >= 0)
608 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
609 log_warning("SO_PRIORITY failed: %m");
611 if (s->receive_buffer > 0) {
612 int value = (int) s->receive_buffer;
613 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
614 log_warning("SO_RCVBUF failed: %m");
617 if (s->send_buffer > 0) {
618 int value = (int) s->send_buffer;
619 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
620 log_warning("SO_SNDBUF failed: %m");
624 if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
625 log_warning("SO_MARK failed: %m");
628 if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
629 log_warning("IP_TOS failed: %m");
631 if (s->ip_ttl >= 0) {
634 r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
635 x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
638 log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
641 if (s->tcp_congestion)
642 if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
643 log_warning("TCP_CONGESTION failed: %m");
646 static void socket_apply_fifo_options(Socket *s, int fd) {
650 if (s->pipe_size > 0)
651 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
652 log_warning("F_SETPIPE_SZ: %m");
656 static int fifo_address_create(
658 mode_t directory_mode,
670 mkdir_parents(path, directory_mode);
672 if ((r = label_fifofile_set(label, path)) < 0)
675 /* Enforce the right access mode for the fifo */
676 old_mask = umask(~ socket_mode);
678 /* Include the original umask in our mask */
679 umask(~socket_mode | old_mask);
681 r = mkfifo(path, socket_mode);
689 if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
696 if (fstat(fd, &st) < 0) {
701 if (!S_ISFIFO(st.st_mode) ||
702 (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
703 st.st_uid != getuid() ||
704 st.st_gid != getgid()) {
717 close_nointr_nofail(fd);
722 static int socket_open_fds(Socket *s) {
729 if ((r = socket_instantiate_service(s)) < 0)
732 if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0)
735 LIST_FOREACH(port, p, s->ports) {
740 if (p->type == SOCKET_SOCKET) {
742 if ((r = socket_address_listen(
754 socket_apply_socket_options(s, p->fd);
756 } else if (p->type == SOCKET_FIFO) {
758 if ((r = fifo_address_create(
766 socket_apply_fifo_options(s, p->fd);
769 assert_not_reached("Unknown port type");
781 static void socket_unwatch_fds(Socket *s) {
786 LIST_FOREACH(port, p, s->ports) {
790 unit_unwatch_fd(UNIT(s), &p->fd_watch);
794 static int socket_watch_fds(Socket *s) {
800 LIST_FOREACH(port, p, s->ports) {
804 p->fd_watch.socket_accept =
806 p->type == SOCKET_SOCKET &&
807 socket_address_can_accept(&p->address);
809 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
816 socket_unwatch_fds(s);
820 static void socket_set_state(Socket *s, SocketState state) {
821 SocketState old_state;
824 old_state = s->state;
827 if (state != SOCKET_START_PRE &&
828 state != SOCKET_START_POST &&
829 state != SOCKET_STOP_PRE &&
830 state != SOCKET_STOP_PRE_SIGTERM &&
831 state != SOCKET_STOP_PRE_SIGKILL &&
832 state != SOCKET_STOP_POST &&
833 state != SOCKET_FINAL_SIGTERM &&
834 state != SOCKET_FINAL_SIGKILL) {
835 unit_unwatch_timer(UNIT(s), &s->timer_watch);
836 socket_unwatch_control_pid(s);
837 s->control_command = NULL;
838 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
841 if (state != SOCKET_LISTENING)
842 socket_unwatch_fds(s);
844 if (state != SOCKET_START_POST &&
845 state != SOCKET_LISTENING &&
846 state != SOCKET_RUNNING &&
847 state != SOCKET_STOP_PRE &&
848 state != SOCKET_STOP_PRE_SIGTERM &&
849 state != SOCKET_STOP_PRE_SIGKILL)
852 if (state != old_state)
853 log_debug("%s changed %s -> %s",
855 socket_state_to_string(old_state),
856 socket_state_to_string(state));
858 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
861 static int socket_coldplug(Unit *u) {
862 Socket *s = SOCKET(u);
866 assert(s->state == SOCKET_DEAD);
868 if (s->deserialized_state != s->state) {
870 if (s->deserialized_state == SOCKET_START_PRE ||
871 s->deserialized_state == SOCKET_START_POST ||
872 s->deserialized_state == SOCKET_STOP_PRE ||
873 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
874 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
875 s->deserialized_state == SOCKET_STOP_POST ||
876 s->deserialized_state == SOCKET_FINAL_SIGTERM ||
877 s->deserialized_state == SOCKET_FINAL_SIGKILL) {
879 if (s->control_pid <= 0)
882 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
885 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
889 if (s->deserialized_state == SOCKET_START_POST ||
890 s->deserialized_state == SOCKET_LISTENING ||
891 s->deserialized_state == SOCKET_RUNNING ||
892 s->deserialized_state == SOCKET_STOP_PRE ||
893 s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
894 s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
895 if ((r = socket_open_fds(s)) < 0)
898 if (s->deserialized_state == SOCKET_LISTENING)
899 if ((r = socket_watch_fds(s)) < 0)
902 socket_set_state(s, s->deserialized_state);
908 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
917 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
920 if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
929 s->meta.manager->environment,
933 s->meta.manager->confirm_spawn,
934 s->meta.cgroup_bondings,
941 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
942 /* FIXME: we need to do something here */
950 unit_unwatch_timer(UNIT(s), &s->timer_watch);
955 static void socket_enter_dead(Socket *s, bool success) {
961 socket_set_state(s, s->failure ? SOCKET_MAINTENANCE : SOCKET_DEAD);
964 static void socket_enter_signal(Socket *s, SocketState state, bool success);
966 static void socket_enter_stop_post(Socket *s, bool success) {
973 socket_unwatch_control_pid(s);
975 s->control_command_id = SOCKET_EXEC_STOP_POST;
977 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
978 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
981 socket_set_state(s, SOCKET_STOP_POST);
983 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
988 log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
989 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
992 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
1001 if (s->exec_context.kill_mode != KILL_NONE) {
1002 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
1004 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
1006 if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
1007 if (r != -EAGAIN && r != -ESRCH)
1013 if (!sent && s->control_pid > 0)
1014 if (kill(s->exec_context.kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
1020 if (sent && s->control_pid > 0) {
1021 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1024 socket_set_state(s, state);
1025 } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1026 socket_enter_stop_post(s, true);
1028 socket_enter_dead(s, true);
1033 log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
1035 if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
1036 socket_enter_stop_post(s, false);
1038 socket_enter_dead(s, false);
1041 static void socket_enter_stop_pre(Socket *s, bool success) {
1048 socket_unwatch_control_pid(s);
1050 s->control_command_id = SOCKET_EXEC_STOP_PRE;
1052 if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
1053 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1056 socket_set_state(s, SOCKET_STOP_PRE);
1058 socket_enter_stop_post(s, true);
1063 log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
1064 socket_enter_stop_post(s, false);
1067 static void socket_enter_listening(Socket *s) {
1071 if ((r = socket_watch_fds(s)) < 0) {
1072 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1076 socket_set_state(s, SOCKET_LISTENING);
1080 socket_enter_stop_pre(s, false);
1083 static void socket_enter_start_post(Socket *s) {
1087 if ((r = socket_open_fds(s)) < 0) {
1088 log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
1092 socket_unwatch_control_pid(s);
1094 s->control_command_id = SOCKET_EXEC_START_POST;
1096 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
1097 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
1098 log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
1102 socket_set_state(s, SOCKET_START_POST);
1104 socket_enter_listening(s);
1109 socket_enter_stop_pre(s, false);
1112 static void socket_enter_start_pre(Socket *s) {
1116 socket_unwatch_control_pid(s);
1118 s->control_command_id = SOCKET_EXEC_START_PRE;
1120 if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
1121 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1124 socket_set_state(s, SOCKET_START_PRE);
1126 socket_enter_start_post(s);
1131 log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
1132 socket_enter_dead(s, false);
1135 static void socket_enter_running(Socket *s, int cfd) {
1140 dbus_error_init(&error);
1142 /* We don't take connections anymore if we are supposed to
1143 * shut down anyway */
1144 if (s->meta.job && s->meta.job->type == JOB_STOP) {
1146 close_nointr_nofail(cfd);
1148 /* Flush all sockets by closing and reopening them */
1149 socket_close_fds(s);
1151 if ((r = socket_watch_fds(s)) < 0) {
1152 log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
1153 socket_enter_stop_pre(s, false);
1161 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
1164 socket_set_state(s, SOCKET_RUNNING);
1166 char *prefix, *instance = NULL, *name;
1169 if (s->n_connections >= s->max_connections) {
1170 log_warning("Too many incoming connections (%u)", s->n_connections);
1171 close_nointr_nofail(cfd);
1175 if ((r = socket_instantiate_service(s)) < 0)
1178 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
1181 if (!(prefix = unit_name_to_prefix(s->meta.id))) {
1187 name = unit_name_build(prefix, instance, ".service");
1196 if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
1201 service = s->service;
1205 unit_choose_id(UNIT(service), name);
1208 if ((r = service_set_socket_fd(service, cfd, s)) < 0)
1212 s->n_connections ++;
1214 if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
1221 log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
1222 socket_enter_stop_pre(s, false);
1225 close_nointr_nofail(cfd);
1227 dbus_error_free(&error);
1230 static void socket_run_next(Socket *s, bool success) {
1234 assert(s->control_command);
1235 assert(s->control_command->command_next);
1240 socket_unwatch_control_pid(s);
1242 s->control_command = s->control_command->command_next;
1244 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
1250 log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
1252 if (s->state == SOCKET_START_POST)
1253 socket_enter_stop_pre(s, false);
1254 else if (s->state == SOCKET_STOP_POST)
1255 socket_enter_dead(s, false);
1257 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1260 static int socket_start(Unit *u) {
1261 Socket *s = SOCKET(u);
1265 /* We cannot fulfill this request right now, try again later
1267 if (s->state == SOCKET_STOP_PRE ||
1268 s->state == SOCKET_STOP_PRE_SIGKILL ||
1269 s->state == SOCKET_STOP_PRE_SIGTERM ||
1270 s->state == SOCKET_STOP_POST ||
1271 s->state == SOCKET_FINAL_SIGTERM ||
1272 s->state == SOCKET_FINAL_SIGKILL)
1275 if (s->state == SOCKET_START_PRE ||
1276 s->state == SOCKET_START_POST)
1279 /* Cannot run this without the service being around */
1281 if (s->service->meta.load_state != UNIT_LOADED)
1284 /* If the service is alredy actvie we cannot start the
1286 if (s->service->state != SERVICE_DEAD &&
1287 s->service->state != SERVICE_MAINTENANCE &&
1288 s->service->state != SERVICE_AUTO_RESTART)
1292 assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTENANCE);
1295 socket_enter_start_pre(s);
1299 static int socket_stop(Unit *u) {
1300 Socket *s = SOCKET(u);
1305 if (s->state == SOCKET_STOP_PRE ||
1306 s->state == SOCKET_STOP_PRE_SIGTERM ||
1307 s->state == SOCKET_STOP_PRE_SIGKILL ||
1308 s->state == SOCKET_STOP_POST ||
1309 s->state == SOCKET_FINAL_SIGTERM ||
1310 s->state == SOCKET_FINAL_SIGKILL)
1313 /* If there's already something running we go directly into
1315 if (s->state == SOCKET_START_PRE ||
1316 s->state == SOCKET_START_POST) {
1317 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, true);
1321 assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
1323 socket_enter_stop_pre(s, true);
1327 static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
1328 Socket *s = SOCKET(u);
1336 unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
1337 unit_serialize_item(u, f, "failure", yes_no(s->failure));
1338 unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
1340 if (s->control_pid > 0)
1341 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
1343 if (s->control_command_id >= 0)
1344 unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
1346 LIST_FOREACH(port, p, s->ports) {
1352 if ((copy = fdset_put_dup(fds, p->fd)) < 0)
1355 if (p->type == SOCKET_SOCKET) {
1358 if ((r = socket_address_print(&p->address, &t)) < 0)
1361 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
1364 assert(p->type == SOCKET_FIFO);
1365 unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
1372 static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1373 Socket *s = SOCKET(u);
1381 if (streq(key, "state")) {
1384 if ((state = socket_state_from_string(value)) < 0)
1385 log_debug("Failed to parse state value %s", value);
1387 s->deserialized_state = state;
1388 } else if (streq(key, "failure")) {
1391 if ((b = parse_boolean(value)) < 0)
1392 log_debug("Failed to parse failure value %s", value);
1394 s->failure = b || s->failure;
1396 } else if (streq(key, "n-accepted")) {
1399 if ((r = safe_atou(value, &k)) < 0)
1400 log_debug("Failed to parse n-accepted value %s", value);
1403 } else if (streq(key, "control-pid")) {
1406 if ((r = parse_pid(value, &pid)) < 0)
1407 log_debug("Failed to parse control-pid value %s", value);
1409 s->control_pid = pid;
1410 } else if (streq(key, "control-command")) {
1411 SocketExecCommand id;
1413 if ((id = socket_exec_command_from_string(value)) < 0)
1414 log_debug("Failed to parse exec-command value %s", value);
1416 s->control_command_id = id;
1417 s->control_command = s->exec_command[id];
1419 } else if (streq(key, "fifo")) {
1423 if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
1424 log_debug("Failed to parse fifo value %s", value);
1427 LIST_FOREACH(port, p, s->ports)
1428 if (streq(p->path, value+skip))
1433 close_nointr_nofail(p->fd);
1434 p->fd = fdset_remove(fds, fd);
1438 } else if (streq(key, "socket")) {
1439 int fd, type, skip = 0;
1442 if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
1443 log_debug("Failed to parse socket value %s", value);
1446 LIST_FOREACH(port, p, s->ports)
1447 if (socket_address_is(&p->address, value+skip, type))
1452 close_nointr_nofail(p->fd);
1453 p->fd = fdset_remove(fds, fd);
1458 log_debug("Unknown serialization key '%s'", key);
1463 static UnitActiveState socket_active_state(Unit *u) {
1466 return state_translation_table[SOCKET(u)->state];
1469 static const char *socket_sub_state_to_string(Unit *u) {
1472 return socket_state_to_string(SOCKET(u)->state);
1475 static bool socket_check_gc(Unit *u) {
1476 Socket *s = SOCKET(u);
1480 return s->n_connections > 0;
1483 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
1484 Socket *s = SOCKET(u);
1490 if (s->state != SOCKET_LISTENING)
1493 log_debug("Incoming traffic on %s", u->meta.id);
1495 if (events != EPOLLIN) {
1496 log_error("Got invalid poll event on socket.");
1500 if (w->socket_accept) {
1503 if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
1508 log_error("Failed to accept socket: %m");
1515 socket_apply_socket_options(s, cfd);
1518 socket_enter_running(s, cfd);
1522 socket_enter_stop_pre(s, false);
1525 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1526 Socket *s = SOCKET(u);
1532 if (pid != s->control_pid)
1537 success = is_clean_exit(code, status);
1539 if (s->control_command) {
1540 exec_status_exit(&s->control_command->exec_status, pid, code, status);
1542 if (s->control_command->ignore)
1546 log_full(success ? LOG_DEBUG : LOG_NOTICE,
1547 "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1548 s->failure = s->failure || !success;
1550 if (s->control_command && s->control_command->command_next && success) {
1551 log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
1552 socket_run_next(s, success);
1554 s->control_command = NULL;
1555 s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
1557 /* No further commands for this step, so let's figure
1558 * out what to do next */
1560 log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
1564 case SOCKET_START_PRE:
1566 socket_enter_start_post(s);
1568 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1571 case SOCKET_START_POST:
1573 socket_enter_listening(s);
1575 socket_enter_stop_pre(s, false);
1578 case SOCKET_STOP_PRE:
1579 case SOCKET_STOP_PRE_SIGTERM:
1580 case SOCKET_STOP_PRE_SIGKILL:
1581 socket_enter_stop_post(s, success);
1584 case SOCKET_STOP_POST:
1585 case SOCKET_FINAL_SIGTERM:
1586 case SOCKET_FINAL_SIGKILL:
1587 socket_enter_dead(s, success);
1591 assert_not_reached("Uh, control process died at wrong time.");
1596 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1597 Socket *s = SOCKET(u);
1600 assert(elapsed == 1);
1601 assert(w == &s->timer_watch);
1605 case SOCKET_START_PRE:
1606 log_warning("%s starting timed out. Terminating.", u->meta.id);
1607 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1609 case SOCKET_START_POST:
1610 log_warning("%s starting timed out. Stopping.", u->meta.id);
1611 socket_enter_stop_pre(s, false);
1614 case SOCKET_STOP_PRE:
1615 log_warning("%s stopping timed out. Terminating.", u->meta.id);
1616 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
1619 case SOCKET_STOP_PRE_SIGTERM:
1620 log_warning("%s stopping timed out. Killing.", u->meta.id);
1621 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
1624 case SOCKET_STOP_PRE_SIGKILL:
1625 log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
1626 socket_enter_stop_post(s, false);
1629 case SOCKET_STOP_POST:
1630 log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
1631 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
1634 case SOCKET_FINAL_SIGTERM:
1635 log_warning("%s stopping timed out (2). Killing.", u->meta.id);
1636 socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
1639 case SOCKET_FINAL_SIGKILL:
1640 log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
1641 socket_enter_dead(s, false);
1645 assert_not_reached("Timeout at wrong time.");
1649 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
1658 /* Called from the service code for requesting our fds */
1661 LIST_FOREACH(port, p, s->ports)
1665 if (!(rfds = new(int, rn_fds)) < 0)
1669 LIST_FOREACH(port, p, s->ports)
1673 assert(k == rn_fds);
1681 void socket_notify_service_dead(Socket *s) {
1684 /* The service is dead. Dang!
1686 * This is strictly for one-instance-for-all-connections
1689 if (s->state == SOCKET_RUNNING) {
1690 log_debug("%s got notified about service death.", s->meta.id);
1691 socket_enter_listening(s);
1695 void socket_connection_unref(Socket *s) {
1698 /* The service is dead. Yay!
1700 * This is strictly for one-onstance-per-connection
1703 assert(s->n_connections > 0);
1706 log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
1709 static void socket_reset_maintenance(Unit *u) {
1710 Socket *s = SOCKET(u);
1714 if (s->state == SOCKET_MAINTENANCE)
1715 socket_set_state(s, SOCKET_DEAD);
1720 static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
1721 [SOCKET_DEAD] = "dead",
1722 [SOCKET_START_PRE] = "start-pre",
1723 [SOCKET_START_POST] = "start-post",
1724 [SOCKET_LISTENING] = "listening",
1725 [SOCKET_RUNNING] = "running",
1726 [SOCKET_STOP_PRE] = "stop-pre",
1727 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
1728 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
1729 [SOCKET_STOP_POST] = "stop-post",
1730 [SOCKET_FINAL_SIGTERM] = "final-sigterm",
1731 [SOCKET_FINAL_SIGKILL] = "final-sigkill",
1732 [SOCKET_MAINTENANCE] = "maintenance"
1735 DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
1737 static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
1738 [SOCKET_EXEC_START_PRE] = "StartPre",
1739 [SOCKET_EXEC_START_POST] = "StartPost",
1740 [SOCKET_EXEC_STOP_PRE] = "StopPre",
1741 [SOCKET_EXEC_STOP_POST] = "StopPost"
1744 DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
1746 const UnitVTable socket_vtable = {
1747 .suffix = ".socket",
1749 .init = socket_init,
1750 .done = socket_done,
1751 .load = socket_load,
1753 .coldplug = socket_coldplug,
1755 .dump = socket_dump,
1757 .start = socket_start,
1758 .stop = socket_stop,
1760 .serialize = socket_serialize,
1761 .deserialize_item = socket_deserialize_item,
1763 .active_state = socket_active_state,
1764 .sub_state_to_string = socket_sub_state_to_string,
1766 .check_gc = socket_check_gc,
1768 .fd_event = socket_fd_event,
1769 .sigchld_event = socket_sigchld_event,
1770 .timer_event = socket_timer_event,
1772 .reset_maintenance = socket_reset_maintenance,
1774 .bus_message_handler = bus_socket_message_handler