1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2013 Lennart Poettering
15 //#include <sys/wait.h>
20 #include "alloc-util.h"
21 #include "bus-container.h"
22 #include "bus-control.h"
23 #include "bus-internal.h"
24 #include "bus-kernel.h"
25 #include "bus-label.h"
26 #include "bus-message.h"
27 #include "bus-objects.h"
28 #include "bus-protocol.h"
30 #include "bus-socket.h"
31 #include "bus-track.h"
34 #include "cgroup-util.h"
37 #include "hexdecoct.h"
38 #include "hostname-util.h"
41 #include "parse-util.h"
42 //#include "process-util.h"
43 #include "string-util.h"
47 /// Additional includes needed by elogind
48 #include "process-util.h"
50 #define log_debug_bus_message(m) \
52 sd_bus_message *_mm = (m); \
53 log_debug("Got message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s", \
54 bus_message_type_to_string(_mm->header->type), \
55 strna(sd_bus_message_get_sender(_mm)), \
56 strna(sd_bus_message_get_destination(_mm)), \
57 strna(sd_bus_message_get_path(_mm)), \
58 strna(sd_bus_message_get_interface(_mm)), \
59 strna(sd_bus_message_get_member(_mm)), \
60 BUS_MESSAGE_COOKIE(_mm), \
62 strna(_mm->root_container.signature), \
63 strna(_mm->error.name), \
64 strna(_mm->error.message)); \
67 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
68 static void bus_detach_io_events(sd_bus *b);
69 static void bus_detach_inotify_event(sd_bus *b);
71 static thread_local sd_bus *default_system_bus = NULL;
72 static thread_local sd_bus *default_user_bus = NULL;
73 static thread_local sd_bus *default_starter_bus = NULL;
75 static sd_bus **bus_choose_default(int (**bus_open)(sd_bus **)) {
78 /* Let's try our best to reuse another cached connection. If
79 * the starter bus type is set, connect via our normal
80 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
81 * we can share the connection with the user/system default
84 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
86 if (streq(e, "system")) {
88 *bus_open = sd_bus_open_system;
89 return &default_system_bus;
90 } else if (STR_IN_SET(e, "user", "session")) {
92 *bus_open = sd_bus_open_user;
93 return &default_user_bus;
97 /* No type is specified, so we have not other option than to
98 * use the starter address if it is set. */
99 e = secure_getenv("DBUS_STARTER_ADDRESS");
102 *bus_open = sd_bus_open;
103 return &default_starter_bus;
106 /* Finally, if nothing is set use the cached connection for
109 if (cg_pid_get_owner_uid(0, NULL) >= 0) {
111 *bus_open = sd_bus_open_user;
112 return &default_user_bus;
115 *bus_open = sd_bus_open_system;
116 return &default_system_bus;
120 sd_bus *bus_resolve(sd_bus *bus) {
121 switch ((uintptr_t) bus) {
122 case (uintptr_t) SD_BUS_DEFAULT:
123 return *(bus_choose_default(NULL));
124 case (uintptr_t) SD_BUS_DEFAULT_USER:
125 return default_user_bus;
126 case (uintptr_t) SD_BUS_DEFAULT_SYSTEM:
127 return default_system_bus;
133 void bus_close_io_fds(sd_bus *b) {
136 bus_detach_io_events(b);
138 if (b->input_fd != b->output_fd)
139 safe_close(b->output_fd);
140 b->output_fd = b->input_fd = safe_close(b->input_fd);
143 void bus_close_inotify_fd(sd_bus *b) {
146 bus_detach_inotify_event(b);
148 b->inotify_fd = safe_close(b->inotify_fd);
149 b->inotify_watches = mfree(b->inotify_watches);
150 b->n_inotify_watches = 0;
153 static void bus_reset_queues(sd_bus *b) {
156 while (b->rqueue_size > 0)
157 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
159 b->rqueue = mfree(b->rqueue);
160 b->rqueue_allocated = 0;
162 while (b->wqueue_size > 0)
163 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
165 b->wqueue = mfree(b->wqueue);
166 b->wqueue_allocated = 0;
169 static void bus_free(sd_bus *b) {
173 assert(!b->track_queue);
176 b->state = BUS_CLOSED;
178 sd_bus_detach_event(b);
180 while ((s = b->slots)) {
181 /* At this point only floating slots can still be
182 * around, because the non-floating ones keep a
183 * reference to the bus, and we thus couldn't be
184 * destructing right now... We forcibly disconnect the
185 * slots here, so that they still can be referenced by
186 * apps, but are dead. */
189 bus_slot_disconnect(s);
190 sd_bus_slot_unref(s);
193 if (b->default_bus_ptr)
194 *b->default_bus_ptr = NULL;
197 bus_close_inotify_fd(b);
202 free(b->unique_name);
203 free(b->auth_buffer);
206 free(b->cgroup_root);
207 free(b->description);
208 free(b->patch_sender);
211 strv_free(b->exec_argv);
213 close_many(b->fds, b->n_fds);
218 ordered_hashmap_free_free(b->reply_callbacks);
219 prioq_free(b->reply_callbacks_prioq);
221 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
222 bus_match_free(&b->match_callbacks);
224 hashmap_free_free(b->vtable_methods);
225 hashmap_free_free(b->vtable_properties);
227 assert(hashmap_isempty(b->nodes));
228 hashmap_free(b->nodes);
232 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
237 _public_ int sd_bus_new(sd_bus **ret) {
240 assert_return(ret, -EINVAL);
246 r->n_ref = REFCNT_INIT;
247 r->input_fd = r->output_fd = -1;
249 r->message_version = 1;
250 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
252 r->original_pid = getpid_cached();
253 r->n_groups = (size_t) -1;
255 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
257 /* We guarantee that wqueue always has space for at least one
259 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
268 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
271 assert_return(bus, -EINVAL);
272 assert_return(bus = bus_resolve(bus), -ENOPKG);
273 assert_return(bus->state == BUS_UNSET, -EPERM);
274 assert_return(address, -EINVAL);
275 assert_return(!bus_pid_changed(bus), -ECHILD);
281 return free_and_replace(bus->address, a);
284 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
285 assert_return(bus, -EINVAL);
286 assert_return(bus = bus_resolve(bus), -ENOPKG);
287 assert_return(bus->state == BUS_UNSET, -EPERM);
288 assert_return(input_fd >= 0, -EBADF);
289 assert_return(output_fd >= 0, -EBADF);
290 assert_return(!bus_pid_changed(bus), -ECHILD);
292 bus->input_fd = input_fd;
293 bus->output_fd = output_fd;
297 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
300 assert_return(bus, -EINVAL);
301 assert_return(bus = bus_resolve(bus), -ENOPKG);
302 assert_return(bus->state == BUS_UNSET, -EPERM);
303 assert_return(path, -EINVAL);
304 assert_return(!strv_isempty(argv), -EINVAL);
305 assert_return(!bus_pid_changed(bus), -ECHILD);
317 free_and_replace(bus->exec_path, p);
319 strv_free(bus->exec_argv);
325 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
326 assert_return(bus, -EINVAL);
327 assert_return(bus = bus_resolve(bus), -ENOPKG);
328 assert_return(bus->state == BUS_UNSET, -EPERM);
329 assert_return(!bus->patch_sender, -EPERM);
330 assert_return(!bus_pid_changed(bus), -ECHILD);
332 bus->bus_client = !!b;
336 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
337 assert_return(bus, -EINVAL);
338 assert_return(bus = bus_resolve(bus), -ENOPKG);
339 assert_return(bus->state == BUS_UNSET, -EPERM);
340 assert_return(!bus_pid_changed(bus), -ECHILD);
342 bus->is_monitor = !!b;
346 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
347 assert_return(bus, -EINVAL);
348 assert_return(bus = bus_resolve(bus), -ENOPKG);
349 assert_return(bus->state == BUS_UNSET, -EPERM);
350 assert_return(!bus_pid_changed(bus), -ECHILD);
352 bus->accept_fd = !!b;
356 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
357 assert_return(bus, -EINVAL);
358 assert_return(bus = bus_resolve(bus), -ENOPKG);
359 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
360 assert_return(!bus_pid_changed(bus), -ECHILD);
362 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
363 * replies, and maybe one day classic D-Bus learns this too */
364 bus->attach_timestamp = !!b;
369 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
370 assert_return(bus, -EINVAL);
371 assert_return(bus = bus_resolve(bus), -ENOPKG);
372 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
373 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
374 assert_return(!bus_pid_changed(bus), -ECHILD);
376 SET_FLAG(bus->creds_mask, mask, b);
378 /* The well knowns we need unconditionally, so that matches can work */
379 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
384 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
385 assert_return(bus, -EINVAL);
386 assert_return(bus = bus_resolve(bus), -ENOPKG);
387 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
388 assert_return(bus->state == BUS_UNSET, -EPERM);
389 assert_return(!bus_pid_changed(bus), -ECHILD);
391 bus->is_server = !!b;
392 bus->server_id = server_id;
396 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
397 assert_return(bus, -EINVAL);
398 assert_return(bus = bus_resolve(bus), -ENOPKG);
399 assert_return(bus->state == BUS_UNSET, -EPERM);
400 assert_return(!bus_pid_changed(bus), -ECHILD);
402 bus->anonymous_auth = !!b;
406 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
407 assert_return(bus, -EINVAL);
408 assert_return(bus = bus_resolve(bus), -ENOPKG);
409 assert_return(bus->state == BUS_UNSET, -EPERM);
410 assert_return(!bus_pid_changed(bus), -ECHILD);
416 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
417 assert_return(bus, -EINVAL);
418 assert_return(bus = bus_resolve(bus), -ENOPKG);
419 assert_return(bus->state == BUS_UNSET, -EPERM);
420 assert_return(!bus_pid_changed(bus), -ECHILD);
422 return free_and_strdup(&bus->description, description);
425 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
426 assert_return(bus, -EINVAL);
427 assert_return(bus = bus_resolve(bus), -ENOPKG);
428 assert_return(!bus_pid_changed(bus), -ECHILD);
430 bus->allow_interactive_authorization = !!b;
434 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
435 assert_return(bus, -EINVAL);
436 assert_return(bus = bus_resolve(bus), -ENOPKG);
437 assert_return(!bus_pid_changed(bus), -ECHILD);
439 return bus->allow_interactive_authorization;
442 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
443 assert_return(bus, -EINVAL);
444 assert_return(bus = bus_resolve(bus), -ENOPKG);
445 assert_return(bus->state == BUS_UNSET, -EPERM);
446 assert_return(!bus_pid_changed(bus), -ECHILD);
448 bus->watch_bind = !!b;
452 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
453 assert_return(bus, -EINVAL);
454 assert_return(bus = bus_resolve(bus), -ENOPKG);
455 assert_return(!bus_pid_changed(bus), -ECHILD);
457 return bus->watch_bind;
460 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
461 assert_return(bus, -EINVAL);
462 assert_return(bus = bus_resolve(bus), -ENOPKG);
463 assert_return(bus->state == BUS_UNSET, -EPERM);
464 assert_return(!bus_pid_changed(bus), -ECHILD);
466 bus->connected_signal = !!b;
470 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
471 assert_return(bus, -EINVAL);
472 assert_return(bus = bus_resolve(bus), -ENOPKG);
473 assert_return(!bus_pid_changed(bus), -ECHILD);
475 return bus->connected_signal;
478 static int synthesize_connected_signal(sd_bus *bus) {
479 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
484 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
485 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
486 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
488 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
489 * that works independently from whether we connected to a full bus or just a direct connection. */
491 if (!bus->connected_signal)
494 r = sd_bus_message_new_signal(
497 "/org/freedesktop/DBus/Local",
498 "org.freedesktop.DBus.Local",
503 bus_message_set_sender_local(bus, m);
505 r = bus_seal_synthetic_message(bus, m);
509 r = bus_rqueue_make_room(bus);
513 /* Insert at the very front */
514 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
515 bus->rqueue[0] = TAKE_PTR(m);
521 void bus_set_state(sd_bus *bus, enum bus_state state) {
523 static const char * const table[_BUS_STATE_MAX] = {
524 [BUS_UNSET] = "UNSET",
525 [BUS_WATCH_BIND] = "WATCH_BIND",
526 [BUS_OPENING] = "OPENING",
527 [BUS_AUTHENTICATING] = "AUTHENTICATING",
528 [BUS_HELLO] = "HELLO",
529 [BUS_RUNNING] = "RUNNING",
530 [BUS_CLOSING] = "CLOSING",
531 [BUS_CLOSED] = "CLOSED",
535 assert(state < _BUS_STATE_MAX);
537 if (state == bus->state)
540 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
544 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
553 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
555 r = sd_bus_message_get_errno(reply);
559 r = sd_bus_message_read(reply, "s", &s);
563 if (!service_name_is_valid(s) || s[0] != ':')
570 free_and_replace(bus->unique_name, t);
572 if (bus->state == BUS_HELLO) {
573 bus_set_state(bus, BUS_RUNNING);
575 r = synthesize_connected_signal(bus);
583 static int bus_send_hello(sd_bus *bus) {
584 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
589 if (!bus->bus_client)
592 r = sd_bus_message_new_method_call(
595 "org.freedesktop.DBus",
596 "/org/freedesktop/DBus",
597 "org.freedesktop.DBus",
602 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
605 int bus_start_running(sd_bus *bus) {
606 struct reply_callback *c;
612 assert(bus->state < BUS_HELLO);
614 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
615 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
616 * adding a fixed value to all entries should not alter the internal order. */
618 n = now(CLOCK_MONOTONIC);
619 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
620 if (c->timeout_usec == 0)
623 c->timeout_usec = usec_add(n, c->timeout_usec);
626 if (bus->bus_client) {
627 bus_set_state(bus, BUS_HELLO);
631 bus_set_state(bus, BUS_RUNNING);
633 r = synthesize_connected_signal(bus);
640 static int parse_address_key(const char **p, const char *key, char **value) {
641 size_t l, n = 0, allocated = 0;
642 _cleanup_free_ char *r = NULL;
651 if (strncmp(*p, key, l) != 0)
664 while (!IN_SET(*a, ';', ',', 0)) {
678 c = (char) ((x << 4) | y);
685 if (!GREEDY_REALLOC(r, allocated, n + 2))
703 free_and_replace(*value, r);
708 static void skip_address_key(const char **p) {
712 *p += strcspn(*p, ",");
718 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
719 _cleanup_free_ char *path = NULL, *abstract = NULL;
728 while (!IN_SET(**p, 0, ';')) {
729 r = parse_address_key(p, "guid", guid);
735 r = parse_address_key(p, "path", &path);
741 r = parse_address_key(p, "abstract", &abstract);
750 if (!path && !abstract)
753 if (path && abstract)
758 if (l > sizeof(b->sockaddr.un.sun_path))
761 b->sockaddr.un.sun_family = AF_UNIX;
762 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
763 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
764 } else if (abstract) {
765 l = strlen(abstract);
766 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
769 b->sockaddr.un.sun_family = AF_UNIX;
770 b->sockaddr.un.sun_path[0] = 0;
771 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
772 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
780 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
781 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
783 struct addrinfo *result, hints = {
784 .ai_socktype = SOCK_STREAM,
785 .ai_flags = AI_ADDRCONFIG,
793 while (!IN_SET(**p, 0, ';')) {
794 r = parse_address_key(p, "guid", guid);
800 r = parse_address_key(p, "host", &host);
806 r = parse_address_key(p, "port", &port);
812 r = parse_address_key(p, "family", &family);
825 if (streq(family, "ipv4"))
826 hints.ai_family = AF_INET;
827 else if (streq(family, "ipv6"))
828 hints.ai_family = AF_INET6;
833 r = getaddrinfo(host, port, &hints, &result);
837 return -EADDRNOTAVAIL;
839 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
840 b->sockaddr_size = result->ai_addrlen;
842 freeaddrinfo(result);
849 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
851 unsigned n_argv = 0, j;
853 size_t allocated = 0;
861 while (!IN_SET(**p, 0, ';')) {
862 r = parse_address_key(p, "guid", guid);
868 r = parse_address_key(p, "path", &path);
874 if (startswith(*p, "argv")) {
878 ul = strtoul(*p + 4, (char**) p, 10);
879 if (errno > 0 || **p != '=' || ul > 256) {
887 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
895 r = parse_address_key(p, NULL, argv + ul);
910 /* Make sure there are no holes in the array, with the
911 * exception of argv[0] */
912 for (j = 1; j < n_argv; j++)
918 if (argv && argv[0] == NULL) {
919 argv[0] = strdup(path);
934 for (j = 0; j < n_argv; j++)
942 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
943 _cleanup_free_ char *machine = NULL, *pid = NULL;
951 while (!IN_SET(**p, 0, ';')) {
952 r = parse_address_key(p, "guid", guid);
958 r = parse_address_key(p, "machine", &machine);
964 r = parse_address_key(p, "pid", &pid);
973 if (!machine == !pid)
977 if (!machine_name_is_valid(machine))
980 free_and_replace(b->machine, machine);
982 b->machine = mfree(b->machine);
986 r = parse_pid(pid, &b->nspid);
992 b->sockaddr.un.sun_family = AF_UNIX;
993 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
994 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
995 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
1001 static void bus_reset_parsed_address(sd_bus *b) {
1005 b->sockaddr_size = 0;
1006 b->exec_argv = strv_free(b->exec_argv);
1007 b->exec_path = mfree(b->exec_path);
1008 b->server_id = SD_ID128_NULL;
1009 b->machine = mfree(b->machine);
1013 static int bus_parse_next_address(sd_bus *b) {
1014 _cleanup_free_ char *guid = NULL;
1022 if (b->address[b->address_index] == 0)
1025 bus_reset_parsed_address(b);
1027 a = b->address + b->address_index;
1036 if (startswith(a, "unix:")) {
1039 r = parse_unix_address(b, &a, &guid);
1044 } else if (startswith(a, "tcp:")) {
1047 r = parse_tcp_address(b, &a, &guid);
1053 } else if (startswith(a, "unixexec:")) {
1056 r = parse_exec_address(b, &a, &guid);
1062 } else if (startswith(a, "x-machine-unix:")) {
1065 r = parse_container_unix_address(b, &a, &guid);
1078 r = sd_id128_from_string(guid, &b->server_id);
1083 b->address_index = a - b->address;
1087 static void bus_kill_exec(sd_bus *bus) {
1088 if (pid_is_valid(bus->busexec_pid) > 0) {
1089 sigterm_wait(bus->busexec_pid);
1090 bus->busexec_pid = 0;
1094 static int bus_start_address(sd_bus *b) {
1100 bus_close_io_fds(b);
1101 bus_close_inotify_fd(b);
1105 /* If you provide multiple different bus-addresses, we
1106 * try all of them in order and use the first one that
1110 r = bus_socket_exec(b);
1111 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1112 r = bus_container_connect_socket(b);
1113 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1114 r = bus_socket_connect(b);
1121 q = bus_attach_io_events(b);
1125 q = bus_attach_inotify_event(b);
1132 b->last_connect_error = -r;
1135 r = bus_parse_next_address(b);
1139 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1143 int bus_next_address(sd_bus *b) {
1146 bus_reset_parsed_address(b);
1147 return bus_start_address(b);
1150 static int bus_start_fd(sd_bus *b) {
1155 assert(b->input_fd >= 0);
1156 assert(b->output_fd >= 0);
1158 r = fd_nonblock(b->input_fd, true);
1162 r = fd_cloexec(b->input_fd, true);
1166 if (b->input_fd != b->output_fd) {
1167 r = fd_nonblock(b->output_fd, true);
1171 r = fd_cloexec(b->output_fd, true);
1176 if (fstat(b->input_fd, &st) < 0)
1179 return bus_socket_take_fd(b);
1182 _public_ int sd_bus_start(sd_bus *bus) {
1185 assert_return(bus, -EINVAL);
1186 assert_return(bus = bus_resolve(bus), -ENOPKG);
1187 assert_return(bus->state == BUS_UNSET, -EPERM);
1188 assert_return(!bus_pid_changed(bus), -ECHILD);
1190 bus_set_state(bus, BUS_OPENING);
1192 if (bus->is_server && bus->bus_client)
1195 if (bus->input_fd >= 0)
1196 r = bus_start_fd(bus);
1197 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1198 r = bus_start_address(bus);
1207 return bus_send_hello(bus);
1210 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1215 assert_return(ret, -EINVAL);
1217 /* Let's connect to the starter bus if it is set, and
1218 * otherwise to the bus that is appropropriate for the scope
1219 * we are running in */
1221 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1223 if (streq(e, "system"))
1224 return sd_bus_open_system_with_description(ret, description);
1225 #if 0 /// elogind does not support systemd user instances
1226 else if (STR_IN_SET(e, "session", "user"))
1228 return sd_bus_open_user_with_description(ret, description);
1231 e = secure_getenv("DBUS_STARTER_ADDRESS");
1233 #if 0 /// elogind does not support systemd user instances
1234 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1235 return sd_bus_open_user_with_description(ret, description);
1238 return sd_bus_open_system_with_description(ret, description);
1245 r = sd_bus_set_address(b, e);
1249 b->bus_client = true;
1251 /* We don't know whether the bus is trusted or not, so better
1252 * be safe, and authenticate everything */
1254 b->is_local = false;
1255 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1257 r = sd_bus_start(b);
1269 _public_ int sd_bus_open(sd_bus **ret) {
1270 return sd_bus_open_with_description(ret, NULL);
1273 int bus_set_address_system(sd_bus *b) {
1277 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1279 return sd_bus_set_address(b, e);
1281 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1284 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1288 assert_return(ret, -EINVAL);
1295 r = sd_bus_set_description(b, description);
1300 r = bus_set_address_system(b);
1304 b->bus_client = true;
1305 b->is_system = true;
1307 /* Let's do per-method access control on the system bus. We
1308 * need the caller's UID and capability set for that. */
1310 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1313 r = sd_bus_start(b);
1325 _public_ int sd_bus_open_system(sd_bus **ret) {
1326 return sd_bus_open_system_with_description(ret, NULL);
1329 #if 0 /// elogind can not open/use a user bus
1330 int bus_set_address_user(sd_bus *b) {
1332 _cleanup_free_ char *ee = NULL, *s = NULL;
1336 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1338 return sd_bus_set_address(b, e);
1340 e = secure_getenv("XDG_RUNTIME_DIR");
1344 ee = bus_address_escape(e);
1348 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1351 b->address = TAKE_PTR(s);
1357 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1358 #if 0 /// elogind does not support user buses
1362 assert_return(ret, -EINVAL);
1369 r = sd_bus_set_description(b, description);
1374 r = bus_set_address_user(b);
1378 b->bus_client = true;
1381 /* We don't do any per-method access control on the user
1386 r = sd_bus_start(b);
1398 _public_ int sd_bus_open_user(sd_bus **ret) {
1399 return sd_bus_open_user_with_description(ret, NULL);
1401 return sd_bus_open_system(ret);
1405 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1406 _cleanup_free_ char *e = NULL;
1407 char *m = NULL, *c = NULL, *a;
1412 /* Let's see if we shall enter some container */
1413 m = strchr(host, ':');
1417 /* Let's make sure this is not a port of some kind,
1418 * and is a valid machine name. */
1419 if (!in_charset(m, DIGITS) && machine_name_is_valid(m)) {
1422 /* Cut out the host part */
1423 t = strndupa(host, m - host - 1);
1424 e = bus_address_escape(t);
1428 c = strjoina(",argv5=--machine=", m);
1433 e = bus_address_escape(host);
1438 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=elogind-stdio-bridge", c);
1442 return free_and_replace(b->address, a);
1445 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1449 assert_return(host, -EINVAL);
1450 assert_return(ret, -EINVAL);
1452 r = sd_bus_new(&bus);
1456 r = bus_set_address_system_remote(bus, host);
1460 bus->bus_client = true;
1461 bus->trusted = false;
1462 bus->is_system = true;
1463 bus->is_local = false;
1465 r = sd_bus_start(bus);
1477 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1478 _cleanup_free_ char *e = NULL;
1484 e = bus_address_escape(machine);
1488 a = strjoin("x-machine-unix:machine=", e);
1492 return free_and_replace(b->address, a);
1495 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1499 assert_return(machine, -EINVAL);
1500 assert_return(ret, -EINVAL);
1501 assert_return(machine_name_is_valid(machine), -EINVAL);
1503 r = sd_bus_new(&bus);
1507 r = bus_set_address_system_machine(bus, machine);
1511 bus->bus_client = true;
1512 bus->trusted = false;
1513 bus->is_system = true;
1514 bus->is_local = false;
1516 r = sd_bus_start(bus);
1528 _public_ void sd_bus_close(sd_bus *bus) {
1532 if (bus->state == BUS_CLOSED)
1534 if (bus_pid_changed(bus))
1537 /* Don't leave ssh hanging around */
1540 bus_set_state(bus, BUS_CLOSED);
1542 sd_bus_detach_event(bus);
1544 /* Drop all queued messages so that they drop references to
1545 * the bus object and the bus may be freed */
1546 bus_reset_queues(bus);
1548 bus_close_io_fds(bus);
1549 bus_close_inotify_fd(bus);
1552 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1557 /* Have to do this before flush() to prevent hang */
1563 return sd_bus_unref(bus);
1566 void bus_enter_closing(sd_bus *bus) {
1569 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1572 bus_set_state(bus, BUS_CLOSING);
1575 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1580 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1585 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1591 i = REFCNT_DEC(bus->n_ref);
1599 _public_ int sd_bus_is_open(sd_bus *bus) {
1601 assert_return(bus, -EINVAL);
1602 assert_return(bus = bus_resolve(bus), -ENOPKG);
1603 assert_return(!bus_pid_changed(bus), -ECHILD);
1605 return BUS_IS_OPEN(bus->state);
1608 _public_ int sd_bus_is_ready(sd_bus *bus) {
1609 assert_return(bus, -EINVAL);
1610 assert_return(bus = bus_resolve(bus), -ENOPKG);
1611 assert_return(!bus_pid_changed(bus), -ECHILD);
1613 return bus->state == BUS_RUNNING;
1616 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1619 assert_return(bus, -EINVAL);
1620 assert_return(bus = bus_resolve(bus), -ENOPKG);
1621 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1622 assert_return(!bus_pid_changed(bus), -ECHILD);
1624 if (bus->is_monitor)
1627 if (type == SD_BUS_TYPE_UNIX_FD) {
1628 if (!bus->accept_fd)
1631 r = bus_ensure_running(bus);
1635 return bus->can_fds;
1638 return bus_type_is_valid(type);
1641 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1644 assert_return(bus, -EINVAL);
1645 assert_return(bus = bus_resolve(bus), -ENOPKG);
1646 assert_return(id, -EINVAL);
1647 assert_return(!bus_pid_changed(bus), -ECHILD);
1649 r = bus_ensure_running(bus);
1653 *id = bus->server_id;
1657 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1664 /* If we copy the same message to multiple
1665 * destinations, avoid using the same cookie
1667 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1672 timeout = BUS_DEFAULT_TIMEOUT;
1674 if (!m->sender && b->patch_sender) {
1675 r = sd_bus_message_set_sender(m, b->patch_sender);
1680 return sd_bus_message_seal(m, ++b->cookie, timeout);
1683 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1684 bool remarshal = false;
1688 /* wrong packet version */
1689 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1692 /* wrong packet endianness */
1693 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1696 return remarshal ? bus_message_remarshal(b, m) : 0;
1699 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1703 /* Fake some timestamps, if they were requested, and not
1704 * already initialized */
1705 if (b->attach_timestamp) {
1706 if (m->realtime <= 0)
1707 m->realtime = now(CLOCK_REALTIME);
1709 if (m->monotonic <= 0)
1710 m->monotonic = now(CLOCK_MONOTONIC);
1713 /* The bus specification says the serial number cannot be 0,
1714 * hence let's fill something in for synthetic messages. Since
1715 * synthetic messages might have a fake sender and we don't
1716 * want to interfere with the real sender's serial numbers we
1717 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1718 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1719 * even though kdbus can do 64bit. */
1720 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1723 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1729 r = bus_socket_write_message(bus, m, idx);
1733 if (*idx >= BUS_MESSAGE_SIZE(m))
1734 log_debug("Sent message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s",
1735 bus_message_type_to_string(m->header->type),
1736 strna(sd_bus_message_get_sender(m)),
1737 strna(sd_bus_message_get_destination(m)),
1738 strna(sd_bus_message_get_path(m)),
1739 strna(sd_bus_message_get_interface(m)),
1740 strna(sd_bus_message_get_member(m)),
1741 BUS_MESSAGE_COOKIE(m),
1743 strna(m->root_container.signature),
1744 strna(m->error.name),
1745 strna(m->error.message));
1750 static int dispatch_wqueue(sd_bus *bus) {
1754 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1756 while (bus->wqueue_size > 0) {
1758 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1762 /* Didn't do anything this time */
1764 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1765 /* Fully written. Let's drop the entry from
1768 * This isn't particularly optimized, but
1769 * well, this is supposed to be our worst-case
1770 * buffer only, and the socket buffer is
1771 * supposed to be our primary buffer, and if
1772 * it got full, then all bets are off
1776 sd_bus_message_unref(bus->wqueue[0]);
1777 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1787 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1790 return bus_socket_read_message(bus);
1793 int bus_rqueue_make_room(sd_bus *bus) {
1796 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1799 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1805 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1810 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1812 /* Note that the priority logic is only available on kdbus,
1813 * where the rqueue is unused. We check the rqueue here
1814 * anyway, because it's simple... */
1817 if (bus->rqueue_size > 0) {
1818 /* Dispatch a queued message */
1820 *m = bus->rqueue[0];
1822 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1826 /* Try to read a new message */
1827 r = bus_read_message(bus, hint_priority, priority);
1837 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1838 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1841 assert_return(m, -EINVAL);
1846 assert_return(!bus_pid_changed(bus), -ECHILD);
1848 if (!BUS_IS_OPEN(bus->state))
1852 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1859 /* If the cookie number isn't kept, then we know that no reply
1861 if (!cookie && !m->sealed)
1862 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1864 r = bus_seal_message(bus, m, 0);
1868 /* Remarshall if we have to. This will possibly unref the
1869 * message and place a replacement in m */
1870 r = bus_remarshal_message(bus, &m);
1874 /* If this is a reply and no reply was requested, then let's
1875 * suppress this, if we can */
1879 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1882 r = bus_write_message(bus, m, &idx);
1884 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1885 bus_enter_closing(bus);
1892 if (idx < BUS_MESSAGE_SIZE(m)) {
1893 /* Wasn't fully written. So let's remember how
1894 * much was written. Note that the first entry
1895 * of the wqueue array is always allocated so
1896 * that we always can remember how much was
1898 bus->wqueue[0] = sd_bus_message_ref(m);
1899 bus->wqueue_size = 1;
1904 /* Just append it to the queue. */
1906 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1909 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1912 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1917 *cookie = BUS_MESSAGE_COOKIE(m);
1922 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1925 assert_return(m, -EINVAL);
1930 assert_return(!bus_pid_changed(bus), -ECHILD);
1932 if (!BUS_IS_OPEN(bus->state))
1935 if (!streq_ptr(m->destination, destination)) {
1940 r = sd_bus_message_set_destination(m, destination);
1945 return sd_bus_send(bus, m, cookie);
1948 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1951 if (usec == (uint64_t) -1)
1954 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1955 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1956 * relative timestamp, and afterwards the absolute one. */
1958 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1961 return now(CLOCK_MONOTONIC) + usec;
1964 static int timeout_compare(const void *a, const void *b) {
1965 const struct reply_callback *x = a, *y = b;
1967 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1970 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1973 if (x->timeout_usec < y->timeout_usec)
1976 if (x->timeout_usec > y->timeout_usec)
1982 _public_ int sd_bus_call_async(
1986 sd_bus_message_handler_t callback,
1990 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1991 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1994 assert_return(m, -EINVAL);
1995 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1996 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
2001 assert_return(!bus_pid_changed(bus), -ECHILD);
2003 if (!BUS_IS_OPEN(bus->state))
2006 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
2007 if (!callback && !slot && !m->sealed)
2008 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
2010 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
2014 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
2018 r = bus_seal_message(bus, m, usec);
2022 r = bus_remarshal_message(bus, &m);
2026 if (slot || callback) {
2027 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2031 s->reply_callback.callback = callback;
2033 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2034 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2036 s->reply_callback.cookie = 0;
2040 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2041 if (s->reply_callback.timeout_usec != 0) {
2042 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2044 s->reply_callback.timeout_usec = 0;
2050 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2061 int bus_ensure_running(sd_bus *bus) {
2066 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2068 if (bus->state == BUS_RUNNING)
2072 r = sd_bus_process(bus, NULL);
2075 if (bus->state == BUS_RUNNING)
2080 r = sd_bus_wait(bus, (uint64_t) -1);
2086 _public_ int sd_bus_call(
2090 sd_bus_error *error,
2091 sd_bus_message **reply) {
2093 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2099 bus_assert_return(m, -EINVAL, error);
2100 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2101 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2102 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2107 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2109 if (!BUS_IS_OPEN(bus->state)) {
2114 r = bus_ensure_running(bus);
2118 i = bus->rqueue_size;
2120 r = bus_seal_message(bus, m, usec);
2124 r = bus_remarshal_message(bus, &m);
2128 r = sd_bus_send(bus, m, &cookie);
2132 timeout = calc_elapse(bus, m->timeout);
2137 while (i < bus->rqueue_size) {
2138 sd_bus_message *incoming = NULL;
2140 incoming = bus->rqueue[i];
2142 if (incoming->reply_cookie == cookie) {
2143 /* Found a match! */
2145 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2147 log_debug_bus_message(incoming);
2149 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2151 if (incoming->n_fds <= 0 || bus->accept_fd) {
2155 sd_bus_message_unref(incoming);
2160 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2161 sd_bus_message_unref(incoming);
2164 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2165 r = sd_bus_error_copy(error, &incoming->error);
2166 sd_bus_message_unref(incoming);
2173 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2176 streq(bus->unique_name, incoming->sender)) {
2178 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2181 /* Our own message? Somebody is trying
2182 * to send its own client a message,
2183 * let's not dead-lock, let's fail
2186 sd_bus_message_unref(incoming);
2191 /* Try to read more, right-away */
2195 r = bus_read_message(bus, false, 0);
2197 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2198 bus_enter_closing(bus);
2210 n = now(CLOCK_MONOTONIC);
2218 left = (uint64_t) -1;
2220 r = bus_poll(bus, true, left);
2228 r = dispatch_wqueue(bus);
2230 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2231 bus_enter_closing(bus);
2240 return sd_bus_error_set_errno(error, r);
2243 _public_ int sd_bus_get_fd(sd_bus *bus) {
2245 assert_return(bus, -EINVAL);
2246 assert_return(bus = bus_resolve(bus), -ENOPKG);
2247 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2248 assert_return(!bus_pid_changed(bus), -ECHILD);
2250 if (bus->state == BUS_CLOSED)
2253 if (bus->inotify_fd >= 0)
2254 return bus->inotify_fd;
2256 if (bus->input_fd >= 0)
2257 return bus->input_fd;
2262 _public_ int sd_bus_get_events(sd_bus *bus) {
2265 assert_return(bus, -EINVAL);
2266 assert_return(bus = bus_resolve(bus), -ENOPKG);
2267 assert_return(!bus_pid_changed(bus), -ECHILD);
2269 switch (bus->state) {
2275 case BUS_WATCH_BIND:
2283 case BUS_AUTHENTICATING:
2284 if (bus_socket_auth_needs_write(bus))
2292 if (bus->rqueue_size <= 0)
2294 if (bus->wqueue_size > 0)
2302 assert_not_reached("Unknown state");
2308 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2309 struct reply_callback *c;
2311 assert_return(bus, -EINVAL);
2312 assert_return(bus = bus_resolve(bus), -ENOPKG);
2313 assert_return(timeout_usec, -EINVAL);
2314 assert_return(!bus_pid_changed(bus), -ECHILD);
2316 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2319 if (bus->track_queue) {
2324 switch (bus->state) {
2326 case BUS_AUTHENTICATING:
2327 *timeout_usec = bus->auth_timeout;
2332 if (bus->rqueue_size > 0) {
2337 c = prioq_peek(bus->reply_callbacks_prioq);
2339 *timeout_usec = (uint64_t) -1;
2343 if (c->timeout_usec == 0) {
2344 *timeout_usec = (uint64_t) -1;
2348 *timeout_usec = c->timeout_usec;
2355 case BUS_WATCH_BIND:
2357 *timeout_usec = (uint64_t) -1;
2361 assert_not_reached("Unknown or unexpected stat");
2365 static int process_timeout(sd_bus *bus) {
2366 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2367 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2368 struct reply_callback *c;
2375 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2377 c = prioq_peek(bus->reply_callbacks_prioq);
2381 n = now(CLOCK_MONOTONIC);
2382 if (c->timeout_usec > n)
2385 r = bus_message_new_synthetic_error(
2388 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2393 r = bus_seal_synthetic_message(bus, m);
2397 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2398 c->timeout_usec = 0;
2400 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2403 slot = container_of(c, sd_bus_slot, reply_callback);
2405 bus->iteration_counter++;
2407 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2409 bus->current_message = m;
2410 bus->current_slot = sd_bus_slot_ref(slot);
2411 bus->current_handler = c->callback;
2412 bus->current_userdata = slot->userdata;
2413 r = c->callback(m, slot->userdata, &error_buffer);
2414 bus->current_userdata = NULL;
2415 bus->current_handler = NULL;
2416 bus->current_slot = NULL;
2417 bus->current_message = NULL;
2419 if (slot->floating) {
2420 bus_slot_disconnect(slot);
2421 sd_bus_slot_unref(slot);
2424 sd_bus_slot_unref(slot);
2426 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2427 * and ignore the callback handler's return value. */
2431 return bus_maybe_reply_error(m, r, &error_buffer);
2434 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2438 if (bus->state != BUS_HELLO)
2441 /* Let's make sure the first message on the bus is the HELLO
2442 * reply. But note that we don't actually parse the message
2443 * here (we leave that to the usual handling), we just verify
2444 * we don't let any earlier msg through. */
2446 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2449 if (m->reply_cookie != 1)
2455 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2456 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2457 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2458 struct reply_callback *c;
2466 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2469 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2472 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2478 slot = container_of(c, sd_bus_slot, reply_callback);
2480 if (m->n_fds > 0 && !bus->accept_fd) {
2482 /* If the reply contained a file descriptor which we
2483 * didn't want we pass an error instead. */
2485 r = bus_message_new_synthetic_error(
2488 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2493 /* Copy over original timestamp */
2494 synthetic_reply->realtime = m->realtime;
2495 synthetic_reply->monotonic = m->monotonic;
2496 synthetic_reply->seqnum = m->seqnum;
2498 r = bus_seal_synthetic_message(bus, synthetic_reply);
2502 m = synthetic_reply;
2504 r = sd_bus_message_rewind(m, true);
2509 if (c->timeout_usec != 0) {
2510 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2511 c->timeout_usec = 0;
2514 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2516 bus->current_slot = sd_bus_slot_ref(slot);
2517 bus->current_handler = c->callback;
2518 bus->current_userdata = slot->userdata;
2519 r = c->callback(m, slot->userdata, &error_buffer);
2520 bus->current_userdata = NULL;
2521 bus->current_handler = NULL;
2522 bus->current_slot = NULL;
2524 if (slot->floating) {
2525 bus_slot_disconnect(slot);
2526 sd_bus_slot_unref(slot);
2529 sd_bus_slot_unref(slot);
2531 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2532 * ignore the callback handler's return value. */
2536 return bus_maybe_reply_error(m, r, &error_buffer);
2539 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2540 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2541 struct filter_callback *l;
2548 bus->filter_callbacks_modified = false;
2550 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2553 if (bus->filter_callbacks_modified)
2556 /* Don't run this more than once per iteration */
2557 if (l->last_iteration == bus->iteration_counter)
2560 l->last_iteration = bus->iteration_counter;
2562 r = sd_bus_message_rewind(m, true);
2566 slot = container_of(l, sd_bus_slot, filter_callback);
2568 bus->current_slot = sd_bus_slot_ref(slot);
2569 bus->current_handler = l->callback;
2570 bus->current_userdata = slot->userdata;
2571 r = l->callback(m, slot->userdata, &error_buffer);
2572 bus->current_userdata = NULL;
2573 bus->current_handler = NULL;
2574 bus->current_slot = sd_bus_slot_unref(slot);
2576 r = bus_maybe_reply_error(m, r, &error_buffer);
2582 } while (bus->filter_callbacks_modified);
2587 static int process_match(sd_bus *bus, sd_bus_message *m) {
2594 bus->match_callbacks_modified = false;
2596 r = bus_match_run(bus, &bus->match_callbacks, m);
2600 } while (bus->match_callbacks_modified);
2605 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2606 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2612 if (bus->is_monitor)
2615 if (bus->manual_peer_interface)
2618 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2621 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2624 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2627 if (streq_ptr(m->member, "Ping"))
2628 r = sd_bus_message_new_method_return(m, &reply);
2629 else if (streq_ptr(m->member, "GetMachineId")) {
2633 r = sd_id128_get_machine(&id);
2637 r = sd_bus_message_new_method_return(m, &reply);
2641 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2643 r = sd_bus_message_new_method_errorf(
2645 SD_BUS_ERROR_UNKNOWN_METHOD,
2646 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2652 r = sd_bus_send(bus, reply, NULL);
2659 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2663 /* If we got a message with a file descriptor which we didn't
2664 * want to accept, then let's drop it. How can this even
2665 * happen? For example, when the kernel queues a message into
2666 * an activatable names's queue which allows fds, and then is
2667 * delivered to us later even though we ourselves did not
2670 if (bus->is_monitor)
2679 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2680 return 1; /* just eat it up */
2682 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2685 static int process_message(sd_bus *bus, sd_bus_message *m) {
2691 bus->current_message = m;
2692 bus->iteration_counter++;
2694 log_debug_bus_message(m);
2696 r = process_hello(bus, m);
2700 r = process_reply(bus, m);
2704 r = process_fd_check(bus, m);
2708 r = process_filter(bus, m);
2712 r = process_match(bus, m);
2716 r = process_builtin(bus, m);
2720 r = bus_process_object(bus, m);
2723 bus->current_message = NULL;
2727 static int dispatch_track(sd_bus *bus) {
2730 if (!bus->track_queue)
2733 bus_track_dispatch(bus->track_queue);
2737 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2738 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2742 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2744 r = process_timeout(bus);
2748 r = dispatch_wqueue(bus);
2752 r = dispatch_track(bus);
2756 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2762 r = process_message(bus, m);
2767 r = sd_bus_message_rewind(m, true);
2776 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2778 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2779 strna(sd_bus_message_get_sender(m)),
2780 strna(sd_bus_message_get_path(m)),
2781 strna(sd_bus_message_get_interface(m)),
2782 strna(sd_bus_message_get_member(m)));
2784 r = sd_bus_reply_method_errorf(
2786 SD_BUS_ERROR_UNKNOWN_OBJECT,
2787 "Unknown object '%s'.", m->path);
2801 static int bus_exit_now(sd_bus *bus) {
2804 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2805 * sd_event_exit(), otherwise invokes libc exit(). */
2807 if (bus->exited) /* did we already exit? */
2809 if (!bus->exit_triggered) /* was the exit condition triggered? */
2811 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2814 bus->exited = true; /* never exit more than once */
2816 log_debug("Bus connection disconnected, exiting.");
2819 return sd_event_exit(bus->event, EXIT_FAILURE);
2823 assert_not_reached("exit() didn't exit?");
2826 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2827 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2828 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2835 r = bus_message_new_synthetic_error(
2838 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2843 r = bus_seal_synthetic_message(bus, m);
2847 if (c->timeout_usec != 0) {
2848 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2849 c->timeout_usec = 0;
2852 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2855 slot = container_of(c, sd_bus_slot, reply_callback);
2857 bus->iteration_counter++;
2859 bus->current_message = m;
2860 bus->current_slot = sd_bus_slot_ref(slot);
2861 bus->current_handler = c->callback;
2862 bus->current_userdata = slot->userdata;
2863 r = c->callback(m, slot->userdata, &error_buffer);
2864 bus->current_userdata = NULL;
2865 bus->current_handler = NULL;
2866 bus->current_slot = NULL;
2867 bus->current_message = NULL;
2869 if (slot->floating) {
2870 bus_slot_disconnect(slot);
2871 sd_bus_slot_unref(slot);
2874 sd_bus_slot_unref(slot);
2876 return bus_maybe_reply_error(m, r, &error_buffer);
2879 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2880 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2881 struct reply_callback *c;
2885 assert(bus->state == BUS_CLOSING);
2887 /* First, fail all outstanding method calls */
2888 c = ordered_hashmap_first(bus->reply_callbacks);
2890 return process_closing_reply_callback(bus, c);
2892 /* Then, fake-drop all remaining bus tracking references */
2894 bus_track_close(bus->tracks);
2898 /* Then, synthesize a Disconnected message */
2899 r = sd_bus_message_new_signal(
2902 "/org/freedesktop/DBus/Local",
2903 "org.freedesktop.DBus.Local",
2908 bus_message_set_sender_local(bus, m);
2910 r = bus_seal_synthetic_message(bus, m);
2916 bus->current_message = m;
2917 bus->iteration_counter++;
2919 r = process_filter(bus, m);
2923 r = process_match(bus, m);
2927 /* Nothing else to do, exit now, if the condition holds */
2928 bus->exit_triggered = true;
2929 (void) bus_exit_now(bus);
2937 bus->current_message = NULL;
2942 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2943 BUS_DONT_DESTROY(bus);
2946 /* Returns 0 when we didn't do anything. This should cause the
2947 * caller to invoke sd_bus_wait() before returning the next
2948 * time. Returns > 0 when we did something, which possibly
2949 * means *ret is filled in with an unprocessed message. */
2951 assert_return(bus, -EINVAL);
2952 assert_return(bus = bus_resolve(bus), -ENOPKG);
2953 assert_return(!bus_pid_changed(bus), -ECHILD);
2955 /* We don't allow recursively invoking sd_bus_process(). */
2956 assert_return(!bus->current_message, -EBUSY);
2957 assert(!bus->current_slot);
2959 switch (bus->state) {
2967 case BUS_WATCH_BIND:
2968 r = bus_socket_process_watch_bind(bus);
2972 r = bus_socket_process_opening(bus);
2975 case BUS_AUTHENTICATING:
2976 r = bus_socket_process_authenticating(bus);
2981 r = process_running(bus, hint_priority, priority, ret);
2985 /* This branch initializes *ret, hence we don't use the generic error checking below */
2989 return process_closing(bus, ret);
2992 assert_not_reached("Unknown state");
2995 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2996 bus_enter_closing(bus);
3007 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
3008 return bus_process_internal(bus, false, 0, ret);
3011 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
3012 return bus_process_internal(bus, true, priority, ret);
3015 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
3016 struct pollfd p[2] = {};
3019 usec_t m = USEC_INFINITY;
3023 if (bus->state == BUS_CLOSING)
3026 if (!BUS_IS_OPEN(bus->state))
3029 if (bus->state == BUS_WATCH_BIND) {
3030 assert(bus->inotify_fd >= 0);
3032 p[0].events = POLLIN;
3033 p[0].fd = bus->inotify_fd;
3038 e = sd_bus_get_events(bus);
3043 /* The caller really needs some more data, he doesn't
3044 * care about what's already read, or any timeouts
3045 * except its own. */
3049 /* The caller wants to process if there's something to
3050 * process, but doesn't care otherwise */
3052 r = sd_bus_get_timeout(bus, &until);
3056 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3059 p[0].fd = bus->input_fd;
3060 if (bus->output_fd == bus->input_fd) {
3064 p[0].events = e & POLLIN;
3065 p[1].fd = bus->output_fd;
3066 p[1].events = e & POLLOUT;
3071 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3074 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3078 return r > 0 ? 1 : 0;
3081 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3083 assert_return(bus, -EINVAL);
3084 assert_return(bus = bus_resolve(bus), -ENOPKG);
3085 assert_return(!bus_pid_changed(bus), -ECHILD);
3087 if (bus->state == BUS_CLOSING)
3090 if (!BUS_IS_OPEN(bus->state))
3093 if (bus->rqueue_size > 0)
3096 return bus_poll(bus, false, timeout_usec);
3099 _public_ int sd_bus_flush(sd_bus *bus) {
3102 assert_return(bus, -EINVAL);
3103 assert_return(bus = bus_resolve(bus), -ENOPKG);
3104 assert_return(!bus_pid_changed(bus), -ECHILD);
3106 if (bus->state == BUS_CLOSING)
3109 if (!BUS_IS_OPEN(bus->state))
3112 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3113 if (bus->state == BUS_WATCH_BIND)
3116 r = bus_ensure_running(bus);
3120 if (bus->wqueue_size <= 0)
3124 r = dispatch_wqueue(bus);
3126 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3127 bus_enter_closing(bus);
3134 if (bus->wqueue_size <= 0)
3137 r = bus_poll(bus, false, (uint64_t) -1);
3143 _public_ int sd_bus_add_filter(
3146 sd_bus_message_handler_t callback,
3151 assert_return(bus, -EINVAL);
3152 assert_return(bus = bus_resolve(bus), -ENOPKG);
3153 assert_return(callback, -EINVAL);
3154 assert_return(!bus_pid_changed(bus), -ECHILD);
3156 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3160 s->filter_callback.callback = callback;
3162 bus->filter_callbacks_modified = true;
3163 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3171 static int add_match_callback(
3174 sd_bus_error *ret_error) {
3176 sd_bus_slot *match_slot = userdata;
3177 bool failed = false;
3183 sd_bus_slot_ref(match_slot);
3185 if (sd_bus_message_is_method_error(m, NULL)) {
3186 log_debug_errno(sd_bus_message_get_errno(m),
3187 "Unable to add match %s, failing connection: %s",
3188 match_slot->match_callback.match_string,
3189 sd_bus_message_get_error(m)->message);
3193 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3195 if (match_slot->match_callback.install_callback) {
3198 bus = sd_bus_message_get_bus(m);
3200 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3201 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3204 assert(bus->current_slot == match_slot->match_callback.install_slot);
3205 assert(bus->current_handler == add_match_callback);
3206 assert(bus->current_userdata == userdata);
3208 bus->current_slot = match_slot;
3209 bus->current_handler = match_slot->match_callback.install_callback;
3210 bus->current_userdata = match_slot->userdata;
3212 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3214 bus->current_slot = match_slot->match_callback.install_slot;
3215 bus->current_handler = add_match_callback;
3216 bus->current_userdata = userdata;
3218 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3220 if (failed) /* Generic failure handling: destroy the connection */
3221 bus_enter_closing(sd_bus_message_get_bus(m));
3226 if (failed && match_slot->floating) {
3227 bus_slot_disconnect(match_slot);
3228 sd_bus_slot_unref(match_slot);
3231 sd_bus_slot_unref(match_slot);
3236 static int bus_add_match_full(
3241 sd_bus_message_handler_t callback,
3242 sd_bus_message_handler_t install_callback,
3245 struct bus_match_component *components = NULL;
3246 unsigned n_components = 0;
3247 sd_bus_slot *s = NULL;
3250 assert_return(bus, -EINVAL);
3251 assert_return(bus = bus_resolve(bus), -ENOPKG);
3252 assert_return(match, -EINVAL);
3253 assert_return(!bus_pid_changed(bus), -ECHILD);
3255 r = bus_match_parse(match, &components, &n_components);
3259 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3265 s->match_callback.callback = callback;
3266 s->match_callback.install_callback = install_callback;
3268 if (bus->bus_client) {
3269 enum bus_match_scope scope;
3271 scope = bus_match_get_scope(components, n_components);
3273 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3274 if (scope != BUS_MATCH_LOCAL) {
3276 /* We store the original match string, so that we can use it to remove the match again. */
3278 s->match_callback.match_string = strdup(match);
3279 if (!s->match_callback.match_string) {
3285 r = bus_add_match_internal_async(bus,
3286 &s->match_callback.install_slot,
3287 s->match_callback.match_string,
3291 r = bus_add_match_internal(bus, s->match_callback.match_string);
3295 s->match_added = true;
3299 bus->match_callbacks_modified = true;
3300 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3309 bus_match_parse_free(components, n_components);
3310 sd_bus_slot_unref(s);
3315 #if 0 /// UNNEEDED by elogind
3317 _public_ int sd_bus_add_match(
3321 sd_bus_message_handler_t callback,
3324 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3327 _public_ int sd_bus_add_match_async(
3331 sd_bus_message_handler_t callback,
3332 sd_bus_message_handler_t install_callback,
3335 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3338 bool bus_pid_changed(sd_bus *bus) {
3341 /* We don't support people creating a bus connection and
3342 * keeping it around over a fork(). Let's complain. */
3344 return bus->original_pid != getpid_cached();
3347 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3348 sd_bus *bus = userdata;
3353 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3355 r = sd_bus_process(bus, NULL);
3357 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3358 bus_enter_closing(bus);
3364 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3365 sd_bus *bus = userdata;
3370 r = sd_bus_process(bus, NULL);
3372 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3373 bus_enter_closing(bus);
3379 static int prepare_callback(sd_event_source *s, void *userdata) {
3380 sd_bus *bus = userdata;
3387 e = sd_bus_get_events(bus);
3393 if (bus->output_fd != bus->input_fd) {
3395 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3399 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3401 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3405 r = sd_bus_get_timeout(bus, &until);
3411 j = sd_event_source_set_time(bus->time_event_source, until);
3418 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3425 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3426 bus_enter_closing(bus);
3431 static int quit_callback(sd_event_source *event, void *userdata) {
3432 sd_bus *bus = userdata;
3442 int bus_attach_io_events(sd_bus *bus) {
3447 if (bus->input_fd < 0)
3453 if (!bus->input_io_event_source) {
3454 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3458 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3462 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3466 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3468 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3473 if (bus->output_fd != bus->input_fd) {
3474 assert(bus->output_fd >= 0);
3476 if (!bus->output_io_event_source) {
3477 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3481 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3485 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3487 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3496 static void bus_detach_io_events(sd_bus *bus) {
3499 if (bus->input_io_event_source) {
3500 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3501 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3504 if (bus->output_io_event_source) {
3505 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3506 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3510 int bus_attach_inotify_event(sd_bus *bus) {
3515 if (bus->inotify_fd < 0)
3521 if (!bus->inotify_event_source) {
3522 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3526 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3530 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3532 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3539 static void bus_detach_inotify_event(sd_bus *bus) {
3542 if (bus->inotify_event_source) {
3543 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3544 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3548 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3551 assert_return(bus, -EINVAL);
3552 assert_return(bus = bus_resolve(bus), -ENOPKG);
3553 assert_return(!bus->event, -EBUSY);
3555 assert(!bus->input_io_event_source);
3556 assert(!bus->output_io_event_source);
3557 assert(!bus->time_event_source);
3560 bus->event = sd_event_ref(event);
3562 r = sd_event_default(&bus->event);
3567 bus->event_priority = priority;
3569 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3573 r = sd_event_source_set_priority(bus->time_event_source, priority);
3577 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3581 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3585 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3589 r = bus_attach_io_events(bus);
3593 r = bus_attach_inotify_event(bus);
3600 sd_bus_detach_event(bus);
3604 _public_ int sd_bus_detach_event(sd_bus *bus) {
3605 assert_return(bus, -EINVAL);
3606 assert_return(bus = bus_resolve(bus), -ENOPKG);
3611 bus_detach_io_events(bus);
3612 bus_detach_inotify_event(bus);
3614 if (bus->time_event_source) {
3615 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3616 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3619 if (bus->quit_event_source) {
3620 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3621 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3624 bus->event = sd_event_unref(bus->event);
3628 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3629 assert_return(bus, NULL);
3634 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3635 assert_return(bus, NULL);
3637 return bus->current_message;
3640 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3641 assert_return(bus, NULL);
3643 return bus->current_slot;
3646 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3647 assert_return(bus, NULL);
3649 return bus->current_handler;
3652 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3653 assert_return(bus, NULL);
3655 return bus->current_userdata;
3658 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3663 assert(default_bus);
3666 return !!*default_bus;
3669 *ret = sd_bus_ref(*default_bus);
3677 b->default_bus_ptr = default_bus;
3685 _public_ int sd_bus_default_system(sd_bus **ret) {
3686 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3689 _public_ int sd_bus_default_user(sd_bus **ret) {
3690 #if 0 /// elogind does not support user buses
3691 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3693 return sd_bus_default_system(ret);
3697 _public_ int sd_bus_default(sd_bus **ret) {
3698 int (*bus_open)(sd_bus **) = NULL;
3701 busp = bus_choose_default(&bus_open);
3702 return bus_default(bus_open, busp, ret);
3705 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3706 assert_return(b, -EINVAL);
3707 assert_return(tid, -EINVAL);
3708 assert_return(!bus_pid_changed(b), -ECHILD);
3716 return sd_event_get_tid(b->event, tid);
3721 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3722 _cleanup_free_ char *e = NULL;
3725 assert_return(object_path_is_valid(prefix), -EINVAL);
3726 assert_return(external_id, -EINVAL);
3727 assert_return(ret_path, -EINVAL);
3729 e = bus_label_escape(external_id);
3733 ret = strjoin(prefix, "/", e);
3741 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3745 assert_return(object_path_is_valid(path), -EINVAL);
3746 assert_return(object_path_is_valid(prefix), -EINVAL);
3747 assert_return(external_id, -EINVAL);
3749 e = object_path_startswith(path, prefix);
3751 *external_id = NULL;
3755 ret = bus_label_unescape(e);
3763 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3764 _cleanup_strv_free_ char **labels = NULL;
3765 char *path, *path_pos, **label_pos;
3766 const char *sep, *template_pos;
3771 assert_return(out, -EINVAL);
3772 assert_return(path_template, -EINVAL);
3774 path_length = strlen(path_template);
3776 va_start(list, path_template);
3777 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3781 arg = va_arg(list, const char *);
3787 label = bus_label_escape(arg);
3793 r = strv_consume(&labels, label);
3799 /* add label length, but account for the format character */
3800 path_length += strlen(label) - 1;
3804 path = malloc(path_length + 1);
3811 for (template_pos = path_template; *template_pos; ) {
3812 sep = strchrnul(template_pos, '%');
3813 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3817 path_pos = stpcpy(path_pos, *label_pos++);
3818 template_pos = sep + 1;
3826 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3827 _cleanup_strv_free_ char **labels = NULL;
3828 const char *template_pos, *path_pos;
3834 * This decodes an object-path based on a template argument. The
3835 * template consists of a verbatim path, optionally including special
3838 * - Each occurrence of '%' in the template matches an arbitrary
3839 * substring of a label in the given path. At most one such
3840 * directive is allowed per label. For each such directive, the
3841 * caller must provide an output parameter (char **) via va_arg. If
3842 * NULL is passed, the given label is verified, but not returned.
3843 * For each matched label, the *decoded* label is stored in the
3844 * passed output argument, and the caller is responsible to free
3845 * it. Note that the output arguments are only modified if the
3846 * actualy path matched the template. Otherwise, they're left
3849 * This function returns <0 on error, 0 if the path does not match the
3850 * template, 1 if it matched.
3853 assert_return(path, -EINVAL);
3854 assert_return(path_template, -EINVAL);
3858 for (template_pos = path_template; *template_pos; ) {
3863 /* verify everything until the next '%' matches verbatim */
3864 sep = strchrnul(template_pos, '%');
3865 length = sep - template_pos;
3866 if (strncmp(path_pos, template_pos, length))
3870 template_pos += length;
3875 /* We found the next '%' character. Everything up until here
3876 * matched. We now skip ahead to the end of this label and make
3877 * sure it matches the tail of the label in the path. Then we
3878 * decode the string in-between and save it for later use. */
3880 ++template_pos; /* skip over '%' */
3882 sep = strchrnul(template_pos, '/');
3883 length = sep - template_pos; /* length of suffix to match verbatim */
3885 /* verify the suffixes match */
3886 sep = strchrnul(path_pos, '/');
3887 if (sep - path_pos < (ssize_t)length ||
3888 strncmp(sep - length, template_pos, length))
3891 template_pos += length; /* skip over matched label */
3892 length = sep - path_pos - length; /* length of sub-label to decode */
3894 /* store unescaped label for later use */
3895 label = bus_label_unescape_n(path_pos, length);
3899 r = strv_consume(&labels, label);
3903 path_pos = sep; /* skip decoded label and suffix */
3906 /* end of template must match end of path */
3910 /* copy the labels over to the caller */
3911 va_start(list, path_template);
3912 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3915 arg = va_arg(list, char **);
3923 labels = mfree(labels);
3927 _public_ int sd_bus_try_close(sd_bus *bus) {
3928 assert_return(bus, -EINVAL);
3929 assert_return(bus = bus_resolve(bus), -ENOPKG);
3930 assert_return(!bus_pid_changed(bus), -ECHILD);
3935 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3936 assert_return(bus, -EINVAL);
3937 assert_return(bus = bus_resolve(bus), -ENOPKG);
3938 assert_return(description, -EINVAL);
3939 assert_return(bus->description, -ENXIO);
3940 assert_return(!bus_pid_changed(bus), -ECHILD);
3942 if (bus->description)
3943 *description = bus->description;
3944 else if (bus->is_system)
3945 *description = "system";
3946 else if (bus->is_user)
3947 *description = "user";
3949 *description = NULL;
3954 int bus_get_root_path(sd_bus *bus) {
3957 if (bus->cgroup_root)
3960 r = cg_get_root_path(&bus->cgroup_root);
3962 bus->cgroup_root = strdup("/");
3963 if (!bus->cgroup_root)
3972 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3973 assert_return(bus, -EINVAL);
3974 assert_return(bus = bus_resolve(bus), -ENOPKG);
3975 assert_return(scope, -EINVAL);
3976 assert_return(!bus_pid_changed(bus), -ECHILD);
3983 if (bus->is_system) {
3991 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3993 assert_return(bus, -EINVAL);
3994 assert_return(bus = bus_resolve(bus), -ENOPKG);
3995 assert_return(address, -EINVAL);
3996 assert_return(!bus_pid_changed(bus), -ECHILD);
3999 *address = bus->address;
4006 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
4007 assert_return(bus, -EINVAL);
4008 assert_return(bus = bus_resolve(bus), -ENOPKG);
4009 assert_return(mask, -EINVAL);
4010 assert_return(!bus_pid_changed(bus), -ECHILD);
4012 *mask = bus->creds_mask;
4016 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
4017 assert_return(bus, -EINVAL);
4018 assert_return(bus = bus_resolve(bus), -ENOPKG);
4019 assert_return(!bus_pid_changed(bus), -ECHILD);
4021 return bus->bus_client;
4024 _public_ int sd_bus_is_server(sd_bus *bus) {
4025 assert_return(bus, -EINVAL);
4026 assert_return(bus = bus_resolve(bus), -ENOPKG);
4027 assert_return(!bus_pid_changed(bus), -ECHILD);
4029 return bus->is_server;
4032 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4033 assert_return(bus, -EINVAL);
4034 assert_return(bus = bus_resolve(bus), -ENOPKG);
4035 assert_return(!bus_pid_changed(bus), -ECHILD);
4037 return bus->anonymous_auth;
4040 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4041 assert_return(bus, -EINVAL);
4042 assert_return(bus = bus_resolve(bus), -ENOPKG);
4043 assert_return(!bus_pid_changed(bus), -ECHILD);
4045 return bus->trusted;
4048 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4049 assert_return(bus, -EINVAL);
4050 assert_return(bus = bus_resolve(bus), -ENOPKG);
4051 assert_return(!bus_pid_changed(bus), -ECHILD);
4053 return bus->is_monitor;
4056 static void flush_close(sd_bus *bus) {
4060 /* Flushes and closes the specified bus. We take a ref before,
4061 * to ensure the flushing does not cause the bus to be
4064 sd_bus_flush_close_unref(sd_bus_ref(bus));
4067 _public_ void sd_bus_default_flush_close(void) {
4068 flush_close(default_starter_bus);
4069 #if 0 /// elogind does not support user buses
4070 flush_close(default_user_bus);
4072 flush_close(default_system_bus);
4075 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4076 assert_return(bus, -EINVAL);
4077 assert_return(bus = bus_resolve(bus), -ENOPKG);
4079 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4080 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4081 * from the client side. */
4082 bus->exit_on_disconnect = b;
4084 /* If the exit condition was triggered already, exit immediately. */
4085 return bus_exit_now(bus);
4088 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4089 assert_return(bus, -EINVAL);
4090 assert_return(bus = bus_resolve(bus), -ENOPKG);
4092 return bus->exit_on_disconnect;
4095 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4096 assert_return(bus, -EINVAL);
4097 assert_return(bus = bus_resolve(bus), -ENOPKG);
4098 assert_return(!bus->bus_client, -EPERM);
4099 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4101 return free_and_strdup(&bus->patch_sender, sender);
4104 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4105 assert_return(bus, -EINVAL);
4106 assert_return(bus = bus_resolve(bus), -ENOPKG);
4107 assert_return(ret, -EINVAL);
4109 if (!bus->patch_sender)
4112 *ret = bus->patch_sender;
4116 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4117 assert_return(bus, -EINVAL);
4118 assert_return(bus = bus_resolve(bus), -ENOPKG);
4119 assert_return(!bus_pid_changed(bus), -ECHILD);
4120 assert_return(ret, -EINVAL);
4122 *ret = bus->rqueue_size;
4126 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4127 assert_return(bus, -EINVAL);
4128 assert_return(bus = bus_resolve(bus), -ENOPKG);
4129 assert_return(!bus_pid_changed(bus), -ECHILD);
4130 assert_return(ret, -EINVAL);
4132 *ret = bus->wqueue_size;