1 /* SPDX-License-Identifier: LGPL-2.1+ */
12 //#include <sys/wait.h>
17 #include "alloc-util.h"
18 #include "bus-container.h"
19 #include "bus-control.h"
20 #include "bus-internal.h"
21 #include "bus-kernel.h"
22 #include "bus-label.h"
23 #include "bus-message.h"
24 #include "bus-objects.h"
25 #include "bus-protocol.h"
27 #include "bus-socket.h"
28 #include "bus-track.h"
31 #include "cgroup-util.h"
34 #include "hexdecoct.h"
35 #include "hostname-util.h"
38 #include "parse-util.h"
39 //#include "process-util.h"
40 #include "string-util.h"
44 /// Additional includes needed by elogind
45 #include "process-util.h"
47 #define log_debug_bus_message(m) \
49 sd_bus_message *_mm = (m); \
50 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", \
51 bus_message_type_to_string(_mm->header->type), \
52 strna(sd_bus_message_get_sender(_mm)), \
53 strna(sd_bus_message_get_destination(_mm)), \
54 strna(sd_bus_message_get_path(_mm)), \
55 strna(sd_bus_message_get_interface(_mm)), \
56 strna(sd_bus_message_get_member(_mm)), \
57 BUS_MESSAGE_COOKIE(_mm), \
59 strna(_mm->root_container.signature), \
60 strna(_mm->error.name), \
61 strna(_mm->error.message)); \
64 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
65 static void bus_detach_io_events(sd_bus *b);
66 static void bus_detach_inotify_event(sd_bus *b);
68 static thread_local sd_bus *default_system_bus = NULL;
69 static thread_local sd_bus *default_user_bus = NULL;
70 static thread_local sd_bus *default_starter_bus = NULL;
72 static sd_bus **bus_choose_default(int (**bus_open)(sd_bus **)) {
75 /* Let's try our best to reuse another cached connection. If
76 * the starter bus type is set, connect via our normal
77 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
78 * we can share the connection with the user/system default
81 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
83 if (streq(e, "system")) {
85 *bus_open = sd_bus_open_system;
86 return &default_system_bus;
87 } else if (STR_IN_SET(e, "user", "session")) {
89 *bus_open = sd_bus_open_user;
90 return &default_user_bus;
94 /* No type is specified, so we have not other option than to
95 * use the starter address if it is set. */
96 e = secure_getenv("DBUS_STARTER_ADDRESS");
99 *bus_open = sd_bus_open;
100 return &default_starter_bus;
103 /* Finally, if nothing is set use the cached connection for
106 if (cg_pid_get_owner_uid(0, NULL) >= 0) {
108 *bus_open = sd_bus_open_user;
109 return &default_user_bus;
112 *bus_open = sd_bus_open_system;
113 return &default_system_bus;
117 sd_bus *bus_resolve(sd_bus *bus) {
118 switch ((uintptr_t) bus) {
119 case (uintptr_t) SD_BUS_DEFAULT:
120 return *(bus_choose_default(NULL));
121 case (uintptr_t) SD_BUS_DEFAULT_USER:
122 return default_user_bus;
123 case (uintptr_t) SD_BUS_DEFAULT_SYSTEM:
124 return default_system_bus;
130 void bus_close_io_fds(sd_bus *b) {
133 bus_detach_io_events(b);
135 if (b->input_fd != b->output_fd)
136 safe_close(b->output_fd);
137 b->output_fd = b->input_fd = safe_close(b->input_fd);
140 void bus_close_inotify_fd(sd_bus *b) {
143 bus_detach_inotify_event(b);
145 b->inotify_fd = safe_close(b->inotify_fd);
146 b->inotify_watches = mfree(b->inotify_watches);
147 b->n_inotify_watches = 0;
150 static void bus_reset_queues(sd_bus *b) {
153 while (b->rqueue_size > 0)
154 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
156 b->rqueue = mfree(b->rqueue);
157 b->rqueue_allocated = 0;
159 while (b->wqueue_size > 0)
160 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
162 b->wqueue = mfree(b->wqueue);
163 b->wqueue_allocated = 0;
166 static sd_bus* bus_free(sd_bus *b) {
170 assert(!b->track_queue);
173 b->state = BUS_CLOSED;
175 sd_bus_detach_event(b);
177 while ((s = b->slots)) {
178 /* At this point only floating slots can still be
179 * around, because the non-floating ones keep a
180 * reference to the bus, and we thus couldn't be
181 * destructing right now... We forcibly disconnect the
182 * slots here, so that they still can be referenced by
183 * apps, but are dead. */
186 bus_slot_disconnect(s);
187 sd_bus_slot_unref(s);
190 if (b->default_bus_ptr)
191 *b->default_bus_ptr = NULL;
194 bus_close_inotify_fd(b);
199 free(b->unique_name);
200 free(b->auth_buffer);
203 free(b->cgroup_root);
204 free(b->description);
205 free(b->patch_sender);
208 strv_free(b->exec_argv);
210 close_many(b->fds, b->n_fds);
215 ordered_hashmap_free_free(b->reply_callbacks);
216 prioq_free(b->reply_callbacks_prioq);
218 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
219 bus_match_free(&b->match_callbacks);
221 hashmap_free_free(b->vtable_methods);
222 hashmap_free_free(b->vtable_properties);
224 assert(hashmap_isempty(b->nodes));
225 hashmap_free(b->nodes);
229 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
234 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, bus_free);
236 _public_ int sd_bus_new(sd_bus **ret) {
237 _cleanup_free_ sd_bus *b = NULL;
239 assert_return(ret, -EINVAL);
245 b->n_ref = REFCNT_INIT;
246 b->input_fd = b->output_fd = -1;
248 b->message_version = 1;
249 b->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
251 b->original_pid = getpid_cached();
252 b->n_groups = (size_t) -1;
254 assert_se(pthread_mutex_init(&b->memfd_cache_mutex, NULL) == 0);
256 /* We guarantee that wqueue always has space for at least one entry */
257 if (!GREEDY_REALLOC(b->wqueue, b->wqueue_allocated, 1))
264 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
265 assert_return(bus, -EINVAL);
266 assert_return(bus = bus_resolve(bus), -ENOPKG);
267 assert_return(bus->state == BUS_UNSET, -EPERM);
268 assert_return(address, -EINVAL);
269 assert_return(!bus_pid_changed(bus), -ECHILD);
271 return free_and_strdup(&bus->address, address);
274 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
275 assert_return(bus, -EINVAL);
276 assert_return(bus = bus_resolve(bus), -ENOPKG);
277 assert_return(bus->state == BUS_UNSET, -EPERM);
278 assert_return(input_fd >= 0, -EBADF);
279 assert_return(output_fd >= 0, -EBADF);
280 assert_return(!bus_pid_changed(bus), -ECHILD);
282 bus->input_fd = input_fd;
283 bus->output_fd = output_fd;
287 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
288 _cleanup_strv_free_ char **a = NULL;
291 assert_return(bus, -EINVAL);
292 assert_return(bus = bus_resolve(bus), -ENOPKG);
293 assert_return(bus->state == BUS_UNSET, -EPERM);
294 assert_return(path, -EINVAL);
295 assert_return(!strv_isempty(argv), -EINVAL);
296 assert_return(!bus_pid_changed(bus), -ECHILD);
302 r = free_and_strdup(&bus->exec_path, path);
306 return strv_free_and_replace(bus->exec_argv, a);
309 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
310 assert_return(bus, -EINVAL);
311 assert_return(bus = bus_resolve(bus), -ENOPKG);
312 assert_return(bus->state == BUS_UNSET, -EPERM);
313 assert_return(!bus->patch_sender, -EPERM);
314 assert_return(!bus_pid_changed(bus), -ECHILD);
316 bus->bus_client = !!b;
320 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
321 assert_return(bus, -EINVAL);
322 assert_return(bus = bus_resolve(bus), -ENOPKG);
323 assert_return(bus->state == BUS_UNSET, -EPERM);
324 assert_return(!bus_pid_changed(bus), -ECHILD);
326 bus->is_monitor = !!b;
330 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
331 assert_return(bus, -EINVAL);
332 assert_return(bus = bus_resolve(bus), -ENOPKG);
333 assert_return(bus->state == BUS_UNSET, -EPERM);
334 assert_return(!bus_pid_changed(bus), -ECHILD);
336 bus->accept_fd = !!b;
340 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
341 assert_return(bus, -EINVAL);
342 assert_return(bus = bus_resolve(bus), -ENOPKG);
343 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
344 assert_return(!bus_pid_changed(bus), -ECHILD);
346 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
347 * replies, and maybe one day classic D-Bus learns this too */
348 bus->attach_timestamp = !!b;
353 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
354 assert_return(bus, -EINVAL);
355 assert_return(bus = bus_resolve(bus), -ENOPKG);
356 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
357 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
358 assert_return(!bus_pid_changed(bus), -ECHILD);
360 SET_FLAG(bus->creds_mask, mask, b);
362 /* The well knowns we need unconditionally, so that matches can work */
363 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
368 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
369 assert_return(bus, -EINVAL);
370 assert_return(bus = bus_resolve(bus), -ENOPKG);
371 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
372 assert_return(bus->state == BUS_UNSET, -EPERM);
373 assert_return(!bus_pid_changed(bus), -ECHILD);
375 bus->is_server = !!b;
376 bus->server_id = server_id;
380 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
381 assert_return(bus, -EINVAL);
382 assert_return(bus = bus_resolve(bus), -ENOPKG);
383 assert_return(bus->state == BUS_UNSET, -EPERM);
384 assert_return(!bus_pid_changed(bus), -ECHILD);
386 bus->anonymous_auth = !!b;
390 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
391 assert_return(bus, -EINVAL);
392 assert_return(bus = bus_resolve(bus), -ENOPKG);
393 assert_return(bus->state == BUS_UNSET, -EPERM);
394 assert_return(!bus_pid_changed(bus), -ECHILD);
400 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
401 assert_return(bus, -EINVAL);
402 assert_return(bus = bus_resolve(bus), -ENOPKG);
403 assert_return(bus->state == BUS_UNSET, -EPERM);
404 assert_return(!bus_pid_changed(bus), -ECHILD);
406 return free_and_strdup(&bus->description, description);
409 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
410 assert_return(bus, -EINVAL);
411 assert_return(bus = bus_resolve(bus), -ENOPKG);
412 assert_return(!bus_pid_changed(bus), -ECHILD);
414 bus->allow_interactive_authorization = !!b;
418 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
419 assert_return(bus, -EINVAL);
420 assert_return(bus = bus_resolve(bus), -ENOPKG);
421 assert_return(!bus_pid_changed(bus), -ECHILD);
423 return bus->allow_interactive_authorization;
426 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
427 assert_return(bus, -EINVAL);
428 assert_return(bus = bus_resolve(bus), -ENOPKG);
429 assert_return(bus->state == BUS_UNSET, -EPERM);
430 assert_return(!bus_pid_changed(bus), -ECHILD);
432 bus->watch_bind = !!b;
436 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
437 assert_return(bus, -EINVAL);
438 assert_return(bus = bus_resolve(bus), -ENOPKG);
439 assert_return(!bus_pid_changed(bus), -ECHILD);
441 return bus->watch_bind;
444 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
445 assert_return(bus, -EINVAL);
446 assert_return(bus = bus_resolve(bus), -ENOPKG);
447 assert_return(bus->state == BUS_UNSET, -EPERM);
448 assert_return(!bus_pid_changed(bus), -ECHILD);
450 bus->connected_signal = !!b;
454 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
455 assert_return(bus, -EINVAL);
456 assert_return(bus = bus_resolve(bus), -ENOPKG);
457 assert_return(!bus_pid_changed(bus), -ECHILD);
459 return bus->connected_signal;
462 static int synthesize_connected_signal(sd_bus *bus) {
463 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
468 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
469 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
470 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
472 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
473 * that works independently from whether we connected to a full bus or just a direct connection. */
475 if (!bus->connected_signal)
478 r = sd_bus_message_new_signal(
481 "/org/freedesktop/DBus/Local",
482 "org.freedesktop.DBus.Local",
487 bus_message_set_sender_local(bus, m);
489 r = bus_seal_synthetic_message(bus, m);
493 r = bus_rqueue_make_room(bus);
497 /* Insert at the very front */
498 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
499 bus->rqueue[0] = TAKE_PTR(m);
505 void bus_set_state(sd_bus *bus, enum bus_state state) {
507 static const char * const table[_BUS_STATE_MAX] = {
508 [BUS_UNSET] = "UNSET",
509 [BUS_WATCH_BIND] = "WATCH_BIND",
510 [BUS_OPENING] = "OPENING",
511 [BUS_AUTHENTICATING] = "AUTHENTICATING",
512 [BUS_HELLO] = "HELLO",
513 [BUS_RUNNING] = "RUNNING",
514 [BUS_CLOSING] = "CLOSING",
515 [BUS_CLOSED] = "CLOSED",
519 assert(state < _BUS_STATE_MAX);
521 if (state == bus->state)
524 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
528 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
536 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
538 r = sd_bus_message_get_errno(reply);
542 r = sd_bus_message_read(reply, "s", &s);
546 if (!service_name_is_valid(s) || s[0] != ':')
549 r = free_and_strdup(&bus->unique_name, s);
553 if (bus->state == BUS_HELLO) {
554 bus_set_state(bus, BUS_RUNNING);
556 r = synthesize_connected_signal(bus);
564 static int bus_send_hello(sd_bus *bus) {
565 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
570 if (!bus->bus_client)
573 r = sd_bus_message_new_method_call(
576 "org.freedesktop.DBus",
577 "/org/freedesktop/DBus",
578 "org.freedesktop.DBus",
583 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
586 int bus_start_running(sd_bus *bus) {
587 struct reply_callback *c;
593 assert(bus->state < BUS_HELLO);
595 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
596 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
597 * adding a fixed value to all entries should not alter the internal order. */
599 n = now(CLOCK_MONOTONIC);
600 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
601 if (c->timeout_usec == 0)
604 c->timeout_usec = usec_add(n, c->timeout_usec);
607 if (bus->bus_client) {
608 bus_set_state(bus, BUS_HELLO);
612 bus_set_state(bus, BUS_RUNNING);
614 r = synthesize_connected_signal(bus);
621 static int parse_address_key(const char **p, const char *key, char **value) {
622 size_t l, n = 0, allocated = 0;
623 _cleanup_free_ char *r = NULL;
632 if (strncmp(*p, key, l) != 0)
645 while (!IN_SET(*a, ';', ',', 0)) {
659 c = (char) ((x << 4) | y);
666 if (!GREEDY_REALLOC(r, allocated, n + 2))
684 free_and_replace(*value, r);
689 static void skip_address_key(const char **p) {
693 *p += strcspn(*p, ",");
699 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
700 _cleanup_free_ char *path = NULL, *abstract = NULL;
709 while (!IN_SET(**p, 0, ';')) {
710 r = parse_address_key(p, "guid", guid);
716 r = parse_address_key(p, "path", &path);
722 r = parse_address_key(p, "abstract", &abstract);
731 if (!path && !abstract)
734 if (path && abstract)
739 if (l > sizeof(b->sockaddr.un.sun_path))
742 b->sockaddr.un.sun_family = AF_UNIX;
743 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
744 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
745 } else if (abstract) {
746 l = strlen(abstract);
747 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
750 b->sockaddr.un.sun_family = AF_UNIX;
751 b->sockaddr.un.sun_path[0] = 0;
752 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
753 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
761 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
762 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
764 struct addrinfo *result, hints = {
765 .ai_socktype = SOCK_STREAM,
766 .ai_flags = AI_ADDRCONFIG,
774 while (!IN_SET(**p, 0, ';')) {
775 r = parse_address_key(p, "guid", guid);
781 r = parse_address_key(p, "host", &host);
787 r = parse_address_key(p, "port", &port);
793 r = parse_address_key(p, "family", &family);
806 if (streq(family, "ipv4"))
807 hints.ai_family = AF_INET;
808 else if (streq(family, "ipv6"))
809 hints.ai_family = AF_INET6;
814 r = getaddrinfo(host, port, &hints, &result);
818 return -EADDRNOTAVAIL;
820 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
821 b->sockaddr_size = result->ai_addrlen;
823 freeaddrinfo(result);
830 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
832 unsigned n_argv = 0, j;
834 size_t allocated = 0;
842 while (!IN_SET(**p, 0, ';')) {
843 r = parse_address_key(p, "guid", guid);
849 r = parse_address_key(p, "path", &path);
855 if (startswith(*p, "argv")) {
859 ul = strtoul(*p + 4, (char**) p, 10);
860 if (errno > 0 || **p != '=' || ul > 256) {
868 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
876 r = parse_address_key(p, NULL, argv + ul);
891 /* Make sure there are no holes in the array, with the
892 * exception of argv[0] */
893 for (j = 1; j < n_argv; j++)
899 if (argv && argv[0] == NULL) {
900 argv[0] = strdup(path);
915 for (j = 0; j < n_argv; j++)
923 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
924 _cleanup_free_ char *machine = NULL, *pid = NULL;
932 while (!IN_SET(**p, 0, ';')) {
933 r = parse_address_key(p, "guid", guid);
939 r = parse_address_key(p, "machine", &machine);
945 r = parse_address_key(p, "pid", &pid);
954 if (!machine == !pid)
958 if (!machine_name_is_valid(machine))
961 free_and_replace(b->machine, machine);
963 b->machine = mfree(b->machine);
967 r = parse_pid(pid, &b->nspid);
973 b->sockaddr.un.sun_family = AF_UNIX;
974 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
975 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
976 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
982 static void bus_reset_parsed_address(sd_bus *b) {
986 b->sockaddr_size = 0;
987 b->exec_argv = strv_free(b->exec_argv);
988 b->exec_path = mfree(b->exec_path);
989 b->server_id = SD_ID128_NULL;
990 b->machine = mfree(b->machine);
994 static int bus_parse_next_address(sd_bus *b) {
995 _cleanup_free_ char *guid = NULL;
1003 if (b->address[b->address_index] == 0)
1006 bus_reset_parsed_address(b);
1008 a = b->address + b->address_index;
1017 if (startswith(a, "unix:")) {
1020 r = parse_unix_address(b, &a, &guid);
1025 } else if (startswith(a, "tcp:")) {
1028 r = parse_tcp_address(b, &a, &guid);
1034 } else if (startswith(a, "unixexec:")) {
1037 r = parse_exec_address(b, &a, &guid);
1043 } else if (startswith(a, "x-machine-unix:")) {
1046 r = parse_container_unix_address(b, &a, &guid);
1059 r = sd_id128_from_string(guid, &b->server_id);
1064 b->address_index = a - b->address;
1068 static void bus_kill_exec(sd_bus *bus) {
1069 if (pid_is_valid(bus->busexec_pid) > 0) {
1070 sigterm_wait(bus->busexec_pid);
1071 bus->busexec_pid = 0;
1075 static int bus_start_address(sd_bus *b) {
1081 bus_close_io_fds(b);
1082 bus_close_inotify_fd(b);
1086 /* If you provide multiple different bus-addresses, we
1087 * try all of them in order and use the first one that
1091 r = bus_socket_exec(b);
1092 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1093 r = bus_container_connect_socket(b);
1094 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1095 r = bus_socket_connect(b);
1102 q = bus_attach_io_events(b);
1106 q = bus_attach_inotify_event(b);
1113 b->last_connect_error = -r;
1116 r = bus_parse_next_address(b);
1120 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1124 int bus_next_address(sd_bus *b) {
1127 bus_reset_parsed_address(b);
1128 return bus_start_address(b);
1131 static int bus_start_fd(sd_bus *b) {
1136 assert(b->input_fd >= 0);
1137 assert(b->output_fd >= 0);
1139 r = fd_nonblock(b->input_fd, true);
1143 r = fd_cloexec(b->input_fd, true);
1147 if (b->input_fd != b->output_fd) {
1148 r = fd_nonblock(b->output_fd, true);
1152 r = fd_cloexec(b->output_fd, true);
1157 if (fstat(b->input_fd, &st) < 0)
1160 return bus_socket_take_fd(b);
1163 _public_ int sd_bus_start(sd_bus *bus) {
1166 assert_return(bus, -EINVAL);
1167 assert_return(bus = bus_resolve(bus), -ENOPKG);
1168 assert_return(bus->state == BUS_UNSET, -EPERM);
1169 assert_return(!bus_pid_changed(bus), -ECHILD);
1171 bus_set_state(bus, BUS_OPENING);
1173 if (bus->is_server && bus->bus_client)
1176 if (bus->input_fd >= 0)
1177 r = bus_start_fd(bus);
1178 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1179 r = bus_start_address(bus);
1188 return bus_send_hello(bus);
1191 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1193 _cleanup_(bus_freep) sd_bus *b = NULL;
1196 assert_return(ret, -EINVAL);
1198 /* Let's connect to the starter bus if it is set, and
1199 * otherwise to the bus that is appropropriate for the scope
1200 * we are running in */
1202 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1204 if (streq(e, "system"))
1205 return sd_bus_open_system_with_description(ret, description);
1206 #if 0 /// elogind does not support systemd user instances
1207 else if (STR_IN_SET(e, "session", "user"))
1209 return sd_bus_open_user_with_description(ret, description);
1212 e = secure_getenv("DBUS_STARTER_ADDRESS");
1214 #if 0 /// elogind does not support systemd user instances
1215 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1216 return sd_bus_open_user_with_description(ret, description);
1219 return sd_bus_open_system_with_description(ret, description);
1226 r = sd_bus_set_address(b, e);
1230 b->bus_client = true;
1232 /* We don't know whether the bus is trusted or not, so better
1233 * be safe, and authenticate everything */
1235 b->is_local = false;
1236 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1238 r = sd_bus_start(b);
1246 _public_ int sd_bus_open(sd_bus **ret) {
1247 return sd_bus_open_with_description(ret, NULL);
1250 int bus_set_address_system(sd_bus *b) {
1254 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1256 return sd_bus_set_address(b, e);
1258 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1261 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1262 _cleanup_(bus_freep) sd_bus *b = NULL;
1265 assert_return(ret, -EINVAL);
1272 r = sd_bus_set_description(b, description);
1277 r = bus_set_address_system(b);
1281 b->bus_client = true;
1282 b->is_system = true;
1284 /* Let's do per-method access control on the system bus. We
1285 * need the caller's UID and capability set for that. */
1287 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1290 r = sd_bus_start(b);
1298 _public_ int sd_bus_open_system(sd_bus **ret) {
1299 return sd_bus_open_system_with_description(ret, NULL);
1302 #if 0 /// elogind can not open/use a user bus
1303 int bus_set_address_user(sd_bus *b) {
1305 _cleanup_free_ char *ee = NULL, *s = NULL;
1309 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1311 return sd_bus_set_address(b, e);
1313 e = secure_getenv("XDG_RUNTIME_DIR");
1317 ee = bus_address_escape(e);
1321 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1324 b->address = TAKE_PTR(s);
1330 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1331 #if 0 /// elogind does not support user buses
1332 _cleanup_(bus_freep) sd_bus *b = NULL;
1335 assert_return(ret, -EINVAL);
1342 r = sd_bus_set_description(b, description);
1347 r = bus_set_address_user(b);
1351 b->bus_client = true;
1354 /* We don't do any per-method access control on the user
1359 r = sd_bus_start(b);
1366 return sd_bus_open_system_with_description(ret, description);
1370 _public_ int sd_bus_open_user(sd_bus **ret) {
1371 return sd_bus_open_user_with_description(ret, NULL);
1374 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1375 _cleanup_free_ char *e = NULL;
1376 char *m = NULL, *c = NULL, *a;
1381 /* Let's see if we shall enter some container */
1382 m = strchr(host, ':');
1386 /* Let's make sure this is not a port of some kind,
1387 * and is a valid machine name. */
1388 if (!in_charset(m, DIGITS) && machine_name_is_valid(m)) {
1391 /* Cut out the host part */
1392 t = strndupa(host, m - host - 1);
1393 e = bus_address_escape(t);
1397 c = strjoina(",argv5=--machine=", m);
1402 e = bus_address_escape(host);
1407 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=elogind-stdio-bridge", c);
1411 return free_and_replace(b->address, a);
1414 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1415 _cleanup_(bus_freep) sd_bus *b = NULL;
1418 assert_return(host, -EINVAL);
1419 assert_return(ret, -EINVAL);
1425 r = bus_set_address_system_remote(b, host);
1429 b->bus_client = true;
1431 b->is_system = true;
1432 b->is_local = false;
1434 r = sd_bus_start(b);
1442 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1443 _cleanup_free_ char *e = NULL;
1449 e = bus_address_escape(machine);
1453 a = strjoin("x-machine-unix:machine=", e);
1457 return free_and_replace(b->address, a);
1460 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1461 _cleanup_(bus_freep) sd_bus *b = NULL;
1464 assert_return(machine, -EINVAL);
1465 assert_return(ret, -EINVAL);
1466 assert_return(machine_name_is_valid(machine), -EINVAL);
1472 r = bus_set_address_system_machine(b, machine);
1476 b->bus_client = true;
1478 b->is_system = true;
1479 b->is_local = false;
1481 r = sd_bus_start(b);
1489 _public_ void sd_bus_close(sd_bus *bus) {
1492 if (bus->state == BUS_CLOSED)
1494 if (bus_pid_changed(bus))
1497 /* Don't leave ssh hanging around */
1500 bus_set_state(bus, BUS_CLOSED);
1502 sd_bus_detach_event(bus);
1504 /* Drop all queued messages so that they drop references to
1505 * the bus object and the bus may be freed */
1506 bus_reset_queues(bus);
1508 bus_close_io_fds(bus);
1509 bus_close_inotify_fd(bus);
1512 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1516 /* Have to do this before flush() to prevent hang */
1522 return sd_bus_unref(bus);
1525 void bus_enter_closing(sd_bus *bus) {
1528 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1531 bus_set_state(bus, BUS_CLOSING);
1534 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1538 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1543 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1549 i = REFCNT_DEC(bus->n_ref);
1553 return bus_free(bus);
1556 _public_ int sd_bus_is_open(sd_bus *bus) {
1557 assert_return(bus, -EINVAL);
1558 assert_return(bus = bus_resolve(bus), -ENOPKG);
1559 assert_return(!bus_pid_changed(bus), -ECHILD);
1561 return BUS_IS_OPEN(bus->state);
1564 _public_ int sd_bus_is_ready(sd_bus *bus) {
1565 assert_return(bus, -EINVAL);
1566 assert_return(bus = bus_resolve(bus), -ENOPKG);
1567 assert_return(!bus_pid_changed(bus), -ECHILD);
1569 return bus->state == BUS_RUNNING;
1572 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1575 assert_return(bus, -EINVAL);
1576 assert_return(bus = bus_resolve(bus), -ENOPKG);
1577 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1578 assert_return(!bus_pid_changed(bus), -ECHILD);
1580 if (bus->is_monitor)
1583 if (type == SD_BUS_TYPE_UNIX_FD) {
1584 if (!bus->accept_fd)
1587 r = bus_ensure_running(bus);
1591 return bus->can_fds;
1594 return bus_type_is_valid(type);
1597 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1600 assert_return(bus, -EINVAL);
1601 assert_return(bus = bus_resolve(bus), -ENOPKG);
1602 assert_return(id, -EINVAL);
1603 assert_return(!bus_pid_changed(bus), -ECHILD);
1605 r = bus_ensure_running(bus);
1609 *id = bus->server_id;
1613 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1620 /* If we copy the same message to multiple
1621 * destinations, avoid using the same cookie
1623 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1628 timeout = BUS_DEFAULT_TIMEOUT;
1630 if (!m->sender && b->patch_sender) {
1631 r = sd_bus_message_set_sender(m, b->patch_sender);
1636 return sd_bus_message_seal(m, ++b->cookie, timeout);
1639 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1640 bool remarshal = false;
1644 /* wrong packet version */
1645 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1648 /* wrong packet endianness */
1649 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1652 return remarshal ? bus_message_remarshal(b, m) : 0;
1655 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1659 /* Fake some timestamps, if they were requested, and not
1660 * already initialized */
1661 if (b->attach_timestamp) {
1662 if (m->realtime <= 0)
1663 m->realtime = now(CLOCK_REALTIME);
1665 if (m->monotonic <= 0)
1666 m->monotonic = now(CLOCK_MONOTONIC);
1669 /* The bus specification says the serial number cannot be 0,
1670 * hence let's fill something in for synthetic messages. Since
1671 * synthetic messages might have a fake sender and we don't
1672 * want to interfere with the real sender's serial numbers we
1673 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1674 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1675 * even though kdbus can do 64bit. */
1676 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1679 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1685 r = bus_socket_write_message(bus, m, idx);
1689 if (*idx >= BUS_MESSAGE_SIZE(m))
1690 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",
1691 bus_message_type_to_string(m->header->type),
1692 strna(sd_bus_message_get_sender(m)),
1693 strna(sd_bus_message_get_destination(m)),
1694 strna(sd_bus_message_get_path(m)),
1695 strna(sd_bus_message_get_interface(m)),
1696 strna(sd_bus_message_get_member(m)),
1697 BUS_MESSAGE_COOKIE(m),
1699 strna(m->root_container.signature),
1700 strna(m->error.name),
1701 strna(m->error.message));
1706 static int dispatch_wqueue(sd_bus *bus) {
1710 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1712 while (bus->wqueue_size > 0) {
1714 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1718 /* Didn't do anything this time */
1720 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1721 /* Fully written. Let's drop the entry from
1724 * This isn't particularly optimized, but
1725 * well, this is supposed to be our worst-case
1726 * buffer only, and the socket buffer is
1727 * supposed to be our primary buffer, and if
1728 * it got full, then all bets are off
1732 sd_bus_message_unref(bus->wqueue[0]);
1733 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1743 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1746 return bus_socket_read_message(bus);
1749 int bus_rqueue_make_room(sd_bus *bus) {
1752 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1755 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1761 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1766 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1768 /* Note that the priority logic is only available on kdbus,
1769 * where the rqueue is unused. We check the rqueue here
1770 * anyway, because it's simple... */
1773 if (bus->rqueue_size > 0) {
1774 /* Dispatch a queued message */
1776 *m = bus->rqueue[0];
1778 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1782 /* Try to read a new message */
1783 r = bus_read_message(bus, hint_priority, priority);
1793 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1794 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1797 assert_return(m, -EINVAL);
1802 assert_return(!bus_pid_changed(bus), -ECHILD);
1804 if (!BUS_IS_OPEN(bus->state))
1808 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1815 /* If the cookie number isn't kept, then we know that no reply
1817 if (!cookie && !m->sealed)
1818 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1820 r = bus_seal_message(bus, m, 0);
1824 /* Remarshall if we have to. This will possibly unref the
1825 * message and place a replacement in m */
1826 r = bus_remarshal_message(bus, &m);
1830 /* If this is a reply and no reply was requested, then let's
1831 * suppress this, if we can */
1835 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1838 r = bus_write_message(bus, m, &idx);
1840 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1841 bus_enter_closing(bus);
1848 if (idx < BUS_MESSAGE_SIZE(m)) {
1849 /* Wasn't fully written. So let's remember how
1850 * much was written. Note that the first entry
1851 * of the wqueue array is always allocated so
1852 * that we always can remember how much was
1854 bus->wqueue[0] = sd_bus_message_ref(m);
1855 bus->wqueue_size = 1;
1860 /* Just append it to the queue. */
1862 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1865 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1868 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1873 *cookie = BUS_MESSAGE_COOKIE(m);
1878 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1881 assert_return(m, -EINVAL);
1886 assert_return(!bus_pid_changed(bus), -ECHILD);
1888 if (!BUS_IS_OPEN(bus->state))
1891 if (!streq_ptr(m->destination, destination)) {
1896 r = sd_bus_message_set_destination(m, destination);
1901 return sd_bus_send(bus, m, cookie);
1904 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1907 if (usec == (uint64_t) -1)
1910 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1911 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1912 * relative timestamp, and afterwards the absolute one. */
1914 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1917 return now(CLOCK_MONOTONIC) + usec;
1920 static int timeout_compare(const void *a, const void *b) {
1921 const struct reply_callback *x = a, *y = b;
1923 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1926 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1929 if (x->timeout_usec < y->timeout_usec)
1932 if (x->timeout_usec > y->timeout_usec)
1938 _public_ int sd_bus_call_async(
1942 sd_bus_message_handler_t callback,
1946 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1947 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1950 assert_return(m, -EINVAL);
1951 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1952 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
1957 assert_return(!bus_pid_changed(bus), -ECHILD);
1959 if (!BUS_IS_OPEN(bus->state))
1962 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
1963 if (!callback && !slot && !m->sealed)
1964 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1966 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1970 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1974 r = bus_seal_message(bus, m, usec);
1978 r = bus_remarshal_message(bus, &m);
1982 if (slot || callback) {
1983 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1987 s->reply_callback.callback = callback;
1989 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1990 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1992 s->reply_callback.cookie = 0;
1996 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
1997 if (s->reply_callback.timeout_usec != 0) {
1998 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2000 s->reply_callback.timeout_usec = 0;
2006 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2017 int bus_ensure_running(sd_bus *bus) {
2022 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2024 if (bus->state == BUS_RUNNING)
2028 r = sd_bus_process(bus, NULL);
2031 if (bus->state == BUS_RUNNING)
2036 r = sd_bus_wait(bus, (uint64_t) -1);
2042 _public_ int sd_bus_call(
2046 sd_bus_error *error,
2047 sd_bus_message **reply) {
2049 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2055 bus_assert_return(m, -EINVAL, error);
2056 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2057 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2058 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2063 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2065 if (!BUS_IS_OPEN(bus->state)) {
2070 r = bus_ensure_running(bus);
2074 i = bus->rqueue_size;
2076 r = bus_seal_message(bus, m, usec);
2080 r = bus_remarshal_message(bus, &m);
2084 r = sd_bus_send(bus, m, &cookie);
2088 timeout = calc_elapse(bus, m->timeout);
2093 while (i < bus->rqueue_size) {
2094 sd_bus_message *incoming = NULL;
2096 incoming = bus->rqueue[i];
2098 if (incoming->reply_cookie == cookie) {
2099 /* Found a match! */
2101 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2103 log_debug_bus_message(incoming);
2105 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2107 if (incoming->n_fds <= 0 || bus->accept_fd) {
2111 sd_bus_message_unref(incoming);
2116 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2117 sd_bus_message_unref(incoming);
2120 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2121 r = sd_bus_error_copy(error, &incoming->error);
2122 sd_bus_message_unref(incoming);
2129 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2132 streq(bus->unique_name, incoming->sender)) {
2134 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2137 /* Our own message? Somebody is trying
2138 * to send its own client a message,
2139 * let's not dead-lock, let's fail
2142 sd_bus_message_unref(incoming);
2147 /* Try to read more, right-away */
2151 r = bus_read_message(bus, false, 0);
2153 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2154 bus_enter_closing(bus);
2166 n = now(CLOCK_MONOTONIC);
2174 left = (uint64_t) -1;
2176 r = bus_poll(bus, true, left);
2184 r = dispatch_wqueue(bus);
2186 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2187 bus_enter_closing(bus);
2196 return sd_bus_error_set_errno(error, r);
2199 _public_ int sd_bus_get_fd(sd_bus *bus) {
2201 assert_return(bus, -EINVAL);
2202 assert_return(bus = bus_resolve(bus), -ENOPKG);
2203 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2204 assert_return(!bus_pid_changed(bus), -ECHILD);
2206 if (bus->state == BUS_CLOSED)
2209 if (bus->inotify_fd >= 0)
2210 return bus->inotify_fd;
2212 if (bus->input_fd >= 0)
2213 return bus->input_fd;
2218 _public_ int sd_bus_get_events(sd_bus *bus) {
2221 assert_return(bus, -EINVAL);
2222 assert_return(bus = bus_resolve(bus), -ENOPKG);
2223 assert_return(!bus_pid_changed(bus), -ECHILD);
2225 switch (bus->state) {
2231 case BUS_WATCH_BIND:
2239 case BUS_AUTHENTICATING:
2240 if (bus_socket_auth_needs_write(bus))
2248 if (bus->rqueue_size <= 0)
2250 if (bus->wqueue_size > 0)
2258 assert_not_reached("Unknown state");
2264 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2265 struct reply_callback *c;
2267 assert_return(bus, -EINVAL);
2268 assert_return(bus = bus_resolve(bus), -ENOPKG);
2269 assert_return(timeout_usec, -EINVAL);
2270 assert_return(!bus_pid_changed(bus), -ECHILD);
2272 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2275 if (bus->track_queue) {
2280 switch (bus->state) {
2282 case BUS_AUTHENTICATING:
2283 *timeout_usec = bus->auth_timeout;
2288 if (bus->rqueue_size > 0) {
2293 c = prioq_peek(bus->reply_callbacks_prioq);
2295 *timeout_usec = (uint64_t) -1;
2299 if (c->timeout_usec == 0) {
2300 *timeout_usec = (uint64_t) -1;
2304 *timeout_usec = c->timeout_usec;
2311 case BUS_WATCH_BIND:
2313 *timeout_usec = (uint64_t) -1;
2317 assert_not_reached("Unknown or unexpected stat");
2321 static int process_timeout(sd_bus *bus) {
2322 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2323 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2324 struct reply_callback *c;
2331 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2333 c = prioq_peek(bus->reply_callbacks_prioq);
2337 n = now(CLOCK_MONOTONIC);
2338 if (c->timeout_usec > n)
2341 r = bus_message_new_synthetic_error(
2344 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2349 r = bus_seal_synthetic_message(bus, m);
2353 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2354 c->timeout_usec = 0;
2356 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2359 slot = container_of(c, sd_bus_slot, reply_callback);
2361 bus->iteration_counter++;
2363 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2365 bus->current_message = m;
2366 bus->current_slot = sd_bus_slot_ref(slot);
2367 bus->current_handler = c->callback;
2368 bus->current_userdata = slot->userdata;
2369 r = c->callback(m, slot->userdata, &error_buffer);
2370 bus->current_userdata = NULL;
2371 bus->current_handler = NULL;
2372 bus->current_slot = NULL;
2373 bus->current_message = NULL;
2375 if (slot->floating) {
2376 bus_slot_disconnect(slot);
2377 sd_bus_slot_unref(slot);
2380 sd_bus_slot_unref(slot);
2382 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2383 * and ignore the callback handler's return value. */
2387 return bus_maybe_reply_error(m, r, &error_buffer);
2390 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2394 if (bus->state != BUS_HELLO)
2397 /* Let's make sure the first message on the bus is the HELLO
2398 * reply. But note that we don't actually parse the message
2399 * here (we leave that to the usual handling), we just verify
2400 * we don't let any earlier msg through. */
2402 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2405 if (m->reply_cookie != 1)
2411 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2412 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2413 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2414 struct reply_callback *c;
2422 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2425 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2428 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2434 slot = container_of(c, sd_bus_slot, reply_callback);
2436 if (m->n_fds > 0 && !bus->accept_fd) {
2438 /* If the reply contained a file descriptor which we
2439 * didn't want we pass an error instead. */
2441 r = bus_message_new_synthetic_error(
2444 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2449 /* Copy over original timestamp */
2450 synthetic_reply->realtime = m->realtime;
2451 synthetic_reply->monotonic = m->monotonic;
2452 synthetic_reply->seqnum = m->seqnum;
2454 r = bus_seal_synthetic_message(bus, synthetic_reply);
2458 m = synthetic_reply;
2460 r = sd_bus_message_rewind(m, true);
2465 if (c->timeout_usec != 0) {
2466 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2467 c->timeout_usec = 0;
2470 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2472 bus->current_slot = sd_bus_slot_ref(slot);
2473 bus->current_handler = c->callback;
2474 bus->current_userdata = slot->userdata;
2475 r = c->callback(m, slot->userdata, &error_buffer);
2476 bus->current_userdata = NULL;
2477 bus->current_handler = NULL;
2478 bus->current_slot = NULL;
2480 if (slot->floating) {
2481 bus_slot_disconnect(slot);
2482 sd_bus_slot_unref(slot);
2485 sd_bus_slot_unref(slot);
2487 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2488 * ignore the callback handler's return value. */
2492 return bus_maybe_reply_error(m, r, &error_buffer);
2495 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2496 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2497 struct filter_callback *l;
2504 bus->filter_callbacks_modified = false;
2506 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2509 if (bus->filter_callbacks_modified)
2512 /* Don't run this more than once per iteration */
2513 if (l->last_iteration == bus->iteration_counter)
2516 l->last_iteration = bus->iteration_counter;
2518 r = sd_bus_message_rewind(m, true);
2522 slot = container_of(l, sd_bus_slot, filter_callback);
2524 bus->current_slot = sd_bus_slot_ref(slot);
2525 bus->current_handler = l->callback;
2526 bus->current_userdata = slot->userdata;
2527 r = l->callback(m, slot->userdata, &error_buffer);
2528 bus->current_userdata = NULL;
2529 bus->current_handler = NULL;
2530 bus->current_slot = sd_bus_slot_unref(slot);
2532 r = bus_maybe_reply_error(m, r, &error_buffer);
2538 } while (bus->filter_callbacks_modified);
2543 static int process_match(sd_bus *bus, sd_bus_message *m) {
2550 bus->match_callbacks_modified = false;
2552 r = bus_match_run(bus, &bus->match_callbacks, m);
2556 } while (bus->match_callbacks_modified);
2561 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2562 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2568 if (bus->is_monitor)
2571 if (bus->manual_peer_interface)
2574 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2577 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2580 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2583 if (streq_ptr(m->member, "Ping"))
2584 r = sd_bus_message_new_method_return(m, &reply);
2585 else if (streq_ptr(m->member, "GetMachineId")) {
2589 r = sd_id128_get_machine(&id);
2593 r = sd_bus_message_new_method_return(m, &reply);
2597 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2599 r = sd_bus_message_new_method_errorf(
2601 SD_BUS_ERROR_UNKNOWN_METHOD,
2602 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2608 r = sd_bus_send(bus, reply, NULL);
2615 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2619 /* If we got a message with a file descriptor which we didn't
2620 * want to accept, then let's drop it. How can this even
2621 * happen? For example, when the kernel queues a message into
2622 * an activatable names's queue which allows fds, and then is
2623 * delivered to us later even though we ourselves did not
2626 if (bus->is_monitor)
2635 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2636 return 1; /* just eat it up */
2638 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2641 static int process_message(sd_bus *bus, sd_bus_message *m) {
2647 bus->current_message = m;
2648 bus->iteration_counter++;
2650 log_debug_bus_message(m);
2652 r = process_hello(bus, m);
2656 r = process_reply(bus, m);
2660 r = process_fd_check(bus, m);
2664 r = process_filter(bus, m);
2668 r = process_match(bus, m);
2672 r = process_builtin(bus, m);
2676 r = bus_process_object(bus, m);
2679 bus->current_message = NULL;
2683 static int dispatch_track(sd_bus *bus) {
2686 if (!bus->track_queue)
2689 bus_track_dispatch(bus->track_queue);
2693 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2694 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2698 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2700 r = process_timeout(bus);
2704 r = dispatch_wqueue(bus);
2708 r = dispatch_track(bus);
2712 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2718 r = process_message(bus, m);
2723 r = sd_bus_message_rewind(m, true);
2732 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2734 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2735 strna(sd_bus_message_get_sender(m)),
2736 strna(sd_bus_message_get_path(m)),
2737 strna(sd_bus_message_get_interface(m)),
2738 strna(sd_bus_message_get_member(m)));
2740 r = sd_bus_reply_method_errorf(
2742 SD_BUS_ERROR_UNKNOWN_OBJECT,
2743 "Unknown object '%s'.", m->path);
2757 static int bus_exit_now(sd_bus *bus) {
2760 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2761 * sd_event_exit(), otherwise invokes libc exit(). */
2763 if (bus->exited) /* did we already exit? */
2765 if (!bus->exit_triggered) /* was the exit condition triggered? */
2767 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2770 bus->exited = true; /* never exit more than once */
2772 log_debug("Bus connection disconnected, exiting.");
2775 return sd_event_exit(bus->event, EXIT_FAILURE);
2779 assert_not_reached("exit() didn't exit?");
2782 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2783 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2784 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2791 r = bus_message_new_synthetic_error(
2794 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2799 r = bus_seal_synthetic_message(bus, m);
2803 if (c->timeout_usec != 0) {
2804 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2805 c->timeout_usec = 0;
2808 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2811 slot = container_of(c, sd_bus_slot, reply_callback);
2813 bus->iteration_counter++;
2815 bus->current_message = m;
2816 bus->current_slot = sd_bus_slot_ref(slot);
2817 bus->current_handler = c->callback;
2818 bus->current_userdata = slot->userdata;
2819 r = c->callback(m, slot->userdata, &error_buffer);
2820 bus->current_userdata = NULL;
2821 bus->current_handler = NULL;
2822 bus->current_slot = NULL;
2823 bus->current_message = NULL;
2825 if (slot->floating) {
2826 bus_slot_disconnect(slot);
2827 sd_bus_slot_unref(slot);
2830 sd_bus_slot_unref(slot);
2832 return bus_maybe_reply_error(m, r, &error_buffer);
2835 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2836 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2837 struct reply_callback *c;
2841 assert(bus->state == BUS_CLOSING);
2843 /* First, fail all outstanding method calls */
2844 c = ordered_hashmap_first(bus->reply_callbacks);
2846 return process_closing_reply_callback(bus, c);
2848 /* Then, fake-drop all remaining bus tracking references */
2850 bus_track_close(bus->tracks);
2854 /* Then, synthesize a Disconnected message */
2855 r = sd_bus_message_new_signal(
2858 "/org/freedesktop/DBus/Local",
2859 "org.freedesktop.DBus.Local",
2864 bus_message_set_sender_local(bus, m);
2866 r = bus_seal_synthetic_message(bus, m);
2872 bus->current_message = m;
2873 bus->iteration_counter++;
2875 r = process_filter(bus, m);
2879 r = process_match(bus, m);
2883 /* Nothing else to do, exit now, if the condition holds */
2884 bus->exit_triggered = true;
2885 (void) bus_exit_now(bus);
2893 bus->current_message = NULL;
2898 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2899 BUS_DONT_DESTROY(bus);
2902 /* Returns 0 when we didn't do anything. This should cause the
2903 * caller to invoke sd_bus_wait() before returning the next
2904 * time. Returns > 0 when we did something, which possibly
2905 * means *ret is filled in with an unprocessed message. */
2907 assert_return(bus, -EINVAL);
2908 assert_return(bus = bus_resolve(bus), -ENOPKG);
2909 assert_return(!bus_pid_changed(bus), -ECHILD);
2911 /* We don't allow recursively invoking sd_bus_process(). */
2912 assert_return(!bus->current_message, -EBUSY);
2913 assert(!bus->current_slot);
2915 switch (bus->state) {
2923 case BUS_WATCH_BIND:
2924 r = bus_socket_process_watch_bind(bus);
2928 r = bus_socket_process_opening(bus);
2931 case BUS_AUTHENTICATING:
2932 r = bus_socket_process_authenticating(bus);
2937 r = process_running(bus, hint_priority, priority, ret);
2941 /* This branch initializes *ret, hence we don't use the generic error checking below */
2945 return process_closing(bus, ret);
2948 assert_not_reached("Unknown state");
2951 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2952 bus_enter_closing(bus);
2963 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2964 return bus_process_internal(bus, false, 0, ret);
2967 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2968 return bus_process_internal(bus, true, priority, ret);
2971 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2972 struct pollfd p[2] = {};
2975 usec_t m = USEC_INFINITY;
2979 if (bus->state == BUS_CLOSING)
2982 if (!BUS_IS_OPEN(bus->state))
2985 if (bus->state == BUS_WATCH_BIND) {
2986 assert(bus->inotify_fd >= 0);
2988 p[0].events = POLLIN;
2989 p[0].fd = bus->inotify_fd;
2994 e = sd_bus_get_events(bus);
2999 /* The caller really needs some more data, he doesn't
3000 * care about what's already read, or any timeouts
3001 * except its own. */
3005 /* The caller wants to process if there's something to
3006 * process, but doesn't care otherwise */
3008 r = sd_bus_get_timeout(bus, &until);
3012 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3015 p[0].fd = bus->input_fd;
3016 if (bus->output_fd == bus->input_fd) {
3020 p[0].events = e & POLLIN;
3021 p[1].fd = bus->output_fd;
3022 p[1].events = e & POLLOUT;
3027 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3030 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3034 return r > 0 ? 1 : 0;
3037 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3039 assert_return(bus, -EINVAL);
3040 assert_return(bus = bus_resolve(bus), -ENOPKG);
3041 assert_return(!bus_pid_changed(bus), -ECHILD);
3043 if (bus->state == BUS_CLOSING)
3046 if (!BUS_IS_OPEN(bus->state))
3049 if (bus->rqueue_size > 0)
3052 return bus_poll(bus, false, timeout_usec);
3055 _public_ int sd_bus_flush(sd_bus *bus) {
3058 assert_return(bus, -EINVAL);
3059 assert_return(bus = bus_resolve(bus), -ENOPKG);
3060 assert_return(!bus_pid_changed(bus), -ECHILD);
3062 if (bus->state == BUS_CLOSING)
3065 if (!BUS_IS_OPEN(bus->state))
3068 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3069 if (bus->state == BUS_WATCH_BIND)
3072 r = bus_ensure_running(bus);
3076 if (bus->wqueue_size <= 0)
3080 r = dispatch_wqueue(bus);
3082 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3083 bus_enter_closing(bus);
3090 if (bus->wqueue_size <= 0)
3093 r = bus_poll(bus, false, (uint64_t) -1);
3099 _public_ int sd_bus_add_filter(
3102 sd_bus_message_handler_t callback,
3107 assert_return(bus, -EINVAL);
3108 assert_return(bus = bus_resolve(bus), -ENOPKG);
3109 assert_return(callback, -EINVAL);
3110 assert_return(!bus_pid_changed(bus), -ECHILD);
3112 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3116 s->filter_callback.callback = callback;
3118 bus->filter_callbacks_modified = true;
3119 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3127 static int add_match_callback(
3130 sd_bus_error *ret_error) {
3132 sd_bus_slot *match_slot = userdata;
3133 bool failed = false;
3139 sd_bus_slot_ref(match_slot);
3141 if (sd_bus_message_is_method_error(m, NULL)) {
3142 log_debug_errno(sd_bus_message_get_errno(m),
3143 "Unable to add match %s, failing connection: %s",
3144 match_slot->match_callback.match_string,
3145 sd_bus_message_get_error(m)->message);
3149 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3151 if (match_slot->match_callback.install_callback) {
3154 bus = sd_bus_message_get_bus(m);
3156 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3157 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3160 assert(bus->current_slot == match_slot->match_callback.install_slot);
3161 assert(bus->current_handler == add_match_callback);
3162 assert(bus->current_userdata == userdata);
3164 bus->current_slot = match_slot;
3165 bus->current_handler = match_slot->match_callback.install_callback;
3166 bus->current_userdata = match_slot->userdata;
3168 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3170 bus->current_slot = match_slot->match_callback.install_slot;
3171 bus->current_handler = add_match_callback;
3172 bus->current_userdata = userdata;
3174 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3176 if (failed) /* Generic failure handling: destroy the connection */
3177 bus_enter_closing(sd_bus_message_get_bus(m));
3182 if (failed && match_slot->floating) {
3183 bus_slot_disconnect(match_slot);
3184 sd_bus_slot_unref(match_slot);
3187 sd_bus_slot_unref(match_slot);
3192 static int bus_add_match_full(
3197 sd_bus_message_handler_t callback,
3198 sd_bus_message_handler_t install_callback,
3201 struct bus_match_component *components = NULL;
3202 unsigned n_components = 0;
3203 sd_bus_slot *s = NULL;
3206 assert_return(bus, -EINVAL);
3207 assert_return(bus = bus_resolve(bus), -ENOPKG);
3208 assert_return(match, -EINVAL);
3209 assert_return(!bus_pid_changed(bus), -ECHILD);
3211 r = bus_match_parse(match, &components, &n_components);
3215 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3221 s->match_callback.callback = callback;
3222 s->match_callback.install_callback = install_callback;
3224 if (bus->bus_client) {
3225 enum bus_match_scope scope;
3227 scope = bus_match_get_scope(components, n_components);
3229 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3230 if (scope != BUS_MATCH_LOCAL) {
3232 /* We store the original match string, so that we can use it to remove the match again. */
3234 s->match_callback.match_string = strdup(match);
3235 if (!s->match_callback.match_string) {
3241 r = bus_add_match_internal_async(bus,
3242 &s->match_callback.install_slot,
3243 s->match_callback.match_string,
3250 /* Make the slot of the match call floating now. We need the reference, but we don't
3251 * want that this match pins the bus object, hence we first create it non-floating, but
3252 * then make it floating. */
3253 r = sd_bus_slot_set_floating(s->match_callback.install_slot, true);
3255 r = bus_add_match_internal(bus, s->match_callback.match_string);
3259 s->match_added = true;
3263 bus->match_callbacks_modified = true;
3264 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3273 bus_match_parse_free(components, n_components);
3274 sd_bus_slot_unref(s);
3279 #if 0 /// UNNEEDED by elogind
3281 _public_ int sd_bus_add_match(
3285 sd_bus_message_handler_t callback,
3288 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3291 _public_ int sd_bus_add_match_async(
3295 sd_bus_message_handler_t callback,
3296 sd_bus_message_handler_t install_callback,
3299 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3302 bool bus_pid_changed(sd_bus *bus) {
3305 /* We don't support people creating a bus connection and
3306 * keeping it around over a fork(). Let's complain. */
3308 return bus->original_pid != getpid_cached();
3311 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3312 sd_bus *bus = userdata;
3317 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3319 r = sd_bus_process(bus, NULL);
3321 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3322 bus_enter_closing(bus);
3328 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3329 sd_bus *bus = userdata;
3334 r = sd_bus_process(bus, NULL);
3336 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3337 bus_enter_closing(bus);
3343 static int prepare_callback(sd_event_source *s, void *userdata) {
3344 sd_bus *bus = userdata;
3351 e = sd_bus_get_events(bus);
3357 if (bus->output_fd != bus->input_fd) {
3359 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3363 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3365 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3369 r = sd_bus_get_timeout(bus, &until);
3375 j = sd_event_source_set_time(bus->time_event_source, until);
3382 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3389 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3390 bus_enter_closing(bus);
3395 static int quit_callback(sd_event_source *event, void *userdata) {
3396 sd_bus *bus = userdata;
3406 int bus_attach_io_events(sd_bus *bus) {
3411 if (bus->input_fd < 0)
3417 if (!bus->input_io_event_source) {
3418 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3422 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3426 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3430 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3432 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3437 if (bus->output_fd != bus->input_fd) {
3438 assert(bus->output_fd >= 0);
3440 if (!bus->output_io_event_source) {
3441 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3445 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3449 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3451 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3460 static void bus_detach_io_events(sd_bus *bus) {
3463 if (bus->input_io_event_source) {
3464 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3465 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3468 if (bus->output_io_event_source) {
3469 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3470 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3474 int bus_attach_inotify_event(sd_bus *bus) {
3479 if (bus->inotify_fd < 0)
3485 if (!bus->inotify_event_source) {
3486 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3490 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3494 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3496 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3503 static void bus_detach_inotify_event(sd_bus *bus) {
3506 if (bus->inotify_event_source) {
3507 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3508 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3512 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3515 assert_return(bus, -EINVAL);
3516 assert_return(bus = bus_resolve(bus), -ENOPKG);
3517 assert_return(!bus->event, -EBUSY);
3519 assert(!bus->input_io_event_source);
3520 assert(!bus->output_io_event_source);
3521 assert(!bus->time_event_source);
3524 bus->event = sd_event_ref(event);
3526 r = sd_event_default(&bus->event);
3531 bus->event_priority = priority;
3533 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3537 r = sd_event_source_set_priority(bus->time_event_source, priority);
3541 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3545 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3549 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3553 r = bus_attach_io_events(bus);
3557 r = bus_attach_inotify_event(bus);
3564 sd_bus_detach_event(bus);
3568 _public_ int sd_bus_detach_event(sd_bus *bus) {
3569 assert_return(bus, -EINVAL);
3570 assert_return(bus = bus_resolve(bus), -ENOPKG);
3575 bus_detach_io_events(bus);
3576 bus_detach_inotify_event(bus);
3578 if (bus->time_event_source) {
3579 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3580 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3583 if (bus->quit_event_source) {
3584 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3585 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3588 bus->event = sd_event_unref(bus->event);
3592 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3593 assert_return(bus, NULL);
3598 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3599 assert_return(bus, NULL);
3601 return bus->current_message;
3604 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3605 assert_return(bus, NULL);
3607 return bus->current_slot;
3610 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3611 assert_return(bus, NULL);
3613 return bus->current_handler;
3616 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3617 assert_return(bus, NULL);
3619 return bus->current_userdata;
3622 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3627 assert(default_bus);
3630 return !!*default_bus;
3633 *ret = sd_bus_ref(*default_bus);
3641 b->default_bus_ptr = default_bus;
3649 _public_ int sd_bus_default_system(sd_bus **ret) {
3650 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3653 _public_ int sd_bus_default_user(sd_bus **ret) {
3654 #if 0 /// elogind does not support user buses
3655 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3657 return sd_bus_default_system(ret);
3661 _public_ int sd_bus_default(sd_bus **ret) {
3662 int (*bus_open)(sd_bus **) = NULL;
3665 busp = bus_choose_default(&bus_open);
3666 return bus_default(bus_open, busp, ret);
3669 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3670 assert_return(b, -EINVAL);
3671 assert_return(tid, -EINVAL);
3672 assert_return(!bus_pid_changed(b), -ECHILD);
3680 return sd_event_get_tid(b->event, tid);
3685 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3686 _cleanup_free_ char *e = NULL;
3689 assert_return(object_path_is_valid(prefix), -EINVAL);
3690 assert_return(external_id, -EINVAL);
3691 assert_return(ret_path, -EINVAL);
3693 e = bus_label_escape(external_id);
3697 ret = strjoin(prefix, "/", e);
3705 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3709 assert_return(object_path_is_valid(path), -EINVAL);
3710 assert_return(object_path_is_valid(prefix), -EINVAL);
3711 assert_return(external_id, -EINVAL);
3713 e = object_path_startswith(path, prefix);
3715 *external_id = NULL;
3719 ret = bus_label_unescape(e);
3727 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3728 _cleanup_strv_free_ char **labels = NULL;
3729 char *path, *path_pos, **label_pos;
3730 const char *sep, *template_pos;
3735 assert_return(out, -EINVAL);
3736 assert_return(path_template, -EINVAL);
3738 path_length = strlen(path_template);
3740 va_start(list, path_template);
3741 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3745 arg = va_arg(list, const char *);
3751 label = bus_label_escape(arg);
3757 r = strv_consume(&labels, label);
3763 /* add label length, but account for the format character */
3764 path_length += strlen(label) - 1;
3768 path = malloc(path_length + 1);
3775 for (template_pos = path_template; *template_pos; ) {
3776 sep = strchrnul(template_pos, '%');
3777 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3781 path_pos = stpcpy(path_pos, *label_pos++);
3782 template_pos = sep + 1;
3790 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3791 _cleanup_strv_free_ char **labels = NULL;
3792 const char *template_pos, *path_pos;
3798 * This decodes an object-path based on a template argument. The
3799 * template consists of a verbatim path, optionally including special
3802 * - Each occurrence of '%' in the template matches an arbitrary
3803 * substring of a label in the given path. At most one such
3804 * directive is allowed per label. For each such directive, the
3805 * caller must provide an output parameter (char **) via va_arg. If
3806 * NULL is passed, the given label is verified, but not returned.
3807 * For each matched label, the *decoded* label is stored in the
3808 * passed output argument, and the caller is responsible to free
3809 * it. Note that the output arguments are only modified if the
3810 * actualy path matched the template. Otherwise, they're left
3813 * This function returns <0 on error, 0 if the path does not match the
3814 * template, 1 if it matched.
3817 assert_return(path, -EINVAL);
3818 assert_return(path_template, -EINVAL);
3822 for (template_pos = path_template; *template_pos; ) {
3827 /* verify everything until the next '%' matches verbatim */
3828 sep = strchrnul(template_pos, '%');
3829 length = sep - template_pos;
3830 if (strncmp(path_pos, template_pos, length))
3834 template_pos += length;
3839 /* We found the next '%' character. Everything up until here
3840 * matched. We now skip ahead to the end of this label and make
3841 * sure it matches the tail of the label in the path. Then we
3842 * decode the string in-between and save it for later use. */
3844 ++template_pos; /* skip over '%' */
3846 sep = strchrnul(template_pos, '/');
3847 length = sep - template_pos; /* length of suffix to match verbatim */
3849 /* verify the suffixes match */
3850 sep = strchrnul(path_pos, '/');
3851 if (sep - path_pos < (ssize_t)length ||
3852 strncmp(sep - length, template_pos, length))
3855 template_pos += length; /* skip over matched label */
3856 length = sep - path_pos - length; /* length of sub-label to decode */
3858 /* store unescaped label for later use */
3859 label = bus_label_unescape_n(path_pos, length);
3863 r = strv_consume(&labels, label);
3867 path_pos = sep; /* skip decoded label and suffix */
3870 /* end of template must match end of path */
3874 /* copy the labels over to the caller */
3875 va_start(list, path_template);
3876 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3879 arg = va_arg(list, char **);
3887 labels = mfree(labels);
3891 _public_ int sd_bus_try_close(sd_bus *bus) {
3892 assert_return(bus, -EINVAL);
3893 assert_return(bus = bus_resolve(bus), -ENOPKG);
3894 assert_return(!bus_pid_changed(bus), -ECHILD);
3899 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3900 assert_return(bus, -EINVAL);
3901 assert_return(bus = bus_resolve(bus), -ENOPKG);
3902 assert_return(description, -EINVAL);
3903 assert_return(bus->description, -ENXIO);
3904 assert_return(!bus_pid_changed(bus), -ECHILD);
3906 if (bus->description)
3907 *description = bus->description;
3908 else if (bus->is_system)
3909 *description = "system";
3910 else if (bus->is_user)
3911 *description = "user";
3913 *description = NULL;
3918 int bus_get_root_path(sd_bus *bus) {
3921 if (bus->cgroup_root)
3924 r = cg_get_root_path(&bus->cgroup_root);
3926 bus->cgroup_root = strdup("/");
3927 if (!bus->cgroup_root)
3936 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3937 assert_return(bus, -EINVAL);
3938 assert_return(bus = bus_resolve(bus), -ENOPKG);
3939 assert_return(scope, -EINVAL);
3940 assert_return(!bus_pid_changed(bus), -ECHILD);
3947 if (bus->is_system) {
3955 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3957 assert_return(bus, -EINVAL);
3958 assert_return(bus = bus_resolve(bus), -ENOPKG);
3959 assert_return(address, -EINVAL);
3960 assert_return(!bus_pid_changed(bus), -ECHILD);
3963 *address = bus->address;
3970 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3971 assert_return(bus, -EINVAL);
3972 assert_return(bus = bus_resolve(bus), -ENOPKG);
3973 assert_return(mask, -EINVAL);
3974 assert_return(!bus_pid_changed(bus), -ECHILD);
3976 *mask = bus->creds_mask;
3980 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3981 assert_return(bus, -EINVAL);
3982 assert_return(bus = bus_resolve(bus), -ENOPKG);
3983 assert_return(!bus_pid_changed(bus), -ECHILD);
3985 return bus->bus_client;
3988 _public_ int sd_bus_is_server(sd_bus *bus) {
3989 assert_return(bus, -EINVAL);
3990 assert_return(bus = bus_resolve(bus), -ENOPKG);
3991 assert_return(!bus_pid_changed(bus), -ECHILD);
3993 return bus->is_server;
3996 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3997 assert_return(bus, -EINVAL);
3998 assert_return(bus = bus_resolve(bus), -ENOPKG);
3999 assert_return(!bus_pid_changed(bus), -ECHILD);
4001 return bus->anonymous_auth;
4004 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4005 assert_return(bus, -EINVAL);
4006 assert_return(bus = bus_resolve(bus), -ENOPKG);
4007 assert_return(!bus_pid_changed(bus), -ECHILD);
4009 return bus->trusted;
4012 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4013 assert_return(bus, -EINVAL);
4014 assert_return(bus = bus_resolve(bus), -ENOPKG);
4015 assert_return(!bus_pid_changed(bus), -ECHILD);
4017 return bus->is_monitor;
4020 static void flush_close(sd_bus *bus) {
4024 /* Flushes and closes the specified bus. We take a ref before,
4025 * to ensure the flushing does not cause the bus to be
4028 sd_bus_flush_close_unref(sd_bus_ref(bus));
4031 _public_ void sd_bus_default_flush_close(void) {
4032 flush_close(default_starter_bus);
4033 #if 0 /// elogind does not support user buses
4034 flush_close(default_user_bus);
4036 flush_close(default_system_bus);
4039 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4040 assert_return(bus, -EINVAL);
4041 assert_return(bus = bus_resolve(bus), -ENOPKG);
4043 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4044 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4045 * from the client side. */
4046 bus->exit_on_disconnect = b;
4048 /* If the exit condition was triggered already, exit immediately. */
4049 return bus_exit_now(bus);
4052 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4053 assert_return(bus, -EINVAL);
4054 assert_return(bus = bus_resolve(bus), -ENOPKG);
4056 return bus->exit_on_disconnect;
4059 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4060 assert_return(bus, -EINVAL);
4061 assert_return(bus = bus_resolve(bus), -ENOPKG);
4062 assert_return(!bus->bus_client, -EPERM);
4063 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4065 return free_and_strdup(&bus->patch_sender, sender);
4068 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4069 assert_return(bus, -EINVAL);
4070 assert_return(bus = bus_resolve(bus), -ENOPKG);
4071 assert_return(ret, -EINVAL);
4073 if (!bus->patch_sender)
4076 *ret = bus->patch_sender;
4080 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4081 assert_return(bus, -EINVAL);
4082 assert_return(bus = bus_resolve(bus), -ENOPKG);
4083 assert_return(!bus_pid_changed(bus), -ECHILD);
4084 assert_return(ret, -EINVAL);
4086 *ret = bus->rqueue_size;
4090 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4091 assert_return(bus, -EINVAL);
4092 assert_return(bus = bus_resolve(bus), -ENOPKG);
4093 assert_return(!bus_pid_changed(bus), -ECHILD);
4094 assert_return(ret, -EINVAL);
4096 *ret = bus->wqueue_size;