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) {
238 _cleanup_free_ sd_bus *b = NULL;
240 assert_return(ret, -EINVAL);
246 b->n_ref = REFCNT_INIT;
247 b->input_fd = b->output_fd = -1;
249 b->message_version = 1;
250 b->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
252 b->original_pid = getpid_cached();
253 b->n_groups = (size_t) -1;
255 assert_se(pthread_mutex_init(&b->memfd_cache_mutex, NULL) == 0);
257 /* We guarantee that wqueue always has space for at least one entry */
258 if (!GREEDY_REALLOC(b->wqueue, b->wqueue_allocated, 1))
265 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
268 assert_return(bus, -EINVAL);
269 assert_return(bus = bus_resolve(bus), -ENOPKG);
270 assert_return(bus->state == BUS_UNSET, -EPERM);
271 assert_return(address, -EINVAL);
272 assert_return(!bus_pid_changed(bus), -ECHILD);
278 return free_and_replace(bus->address, a);
281 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
282 assert_return(bus, -EINVAL);
283 assert_return(bus = bus_resolve(bus), -ENOPKG);
284 assert_return(bus->state == BUS_UNSET, -EPERM);
285 assert_return(input_fd >= 0, -EBADF);
286 assert_return(output_fd >= 0, -EBADF);
287 assert_return(!bus_pid_changed(bus), -ECHILD);
289 bus->input_fd = input_fd;
290 bus->output_fd = output_fd;
294 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
295 _cleanup_free_ char *p = NULL;
298 assert_return(bus, -EINVAL);
299 assert_return(bus = bus_resolve(bus), -ENOPKG);
300 assert_return(bus->state == BUS_UNSET, -EPERM);
301 assert_return(path, -EINVAL);
302 assert_return(!strv_isempty(argv), -EINVAL);
303 assert_return(!bus_pid_changed(bus), -ECHILD);
313 free_and_replace(bus->exec_path, p);
315 strv_free(bus->exec_argv);
321 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
322 assert_return(bus, -EINVAL);
323 assert_return(bus = bus_resolve(bus), -ENOPKG);
324 assert_return(bus->state == BUS_UNSET, -EPERM);
325 assert_return(!bus->patch_sender, -EPERM);
326 assert_return(!bus_pid_changed(bus), -ECHILD);
328 bus->bus_client = !!b;
332 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
333 assert_return(bus, -EINVAL);
334 assert_return(bus = bus_resolve(bus), -ENOPKG);
335 assert_return(bus->state == BUS_UNSET, -EPERM);
336 assert_return(!bus_pid_changed(bus), -ECHILD);
338 bus->is_monitor = !!b;
342 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
343 assert_return(bus, -EINVAL);
344 assert_return(bus = bus_resolve(bus), -ENOPKG);
345 assert_return(bus->state == BUS_UNSET, -EPERM);
346 assert_return(!bus_pid_changed(bus), -ECHILD);
348 bus->accept_fd = !!b;
352 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
353 assert_return(bus, -EINVAL);
354 assert_return(bus = bus_resolve(bus), -ENOPKG);
355 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
356 assert_return(!bus_pid_changed(bus), -ECHILD);
358 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
359 * replies, and maybe one day classic D-Bus learns this too */
360 bus->attach_timestamp = !!b;
365 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
366 assert_return(bus, -EINVAL);
367 assert_return(bus = bus_resolve(bus), -ENOPKG);
368 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
369 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
370 assert_return(!bus_pid_changed(bus), -ECHILD);
372 SET_FLAG(bus->creds_mask, mask, b);
374 /* The well knowns we need unconditionally, so that matches can work */
375 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
380 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
381 assert_return(bus, -EINVAL);
382 assert_return(bus = bus_resolve(bus), -ENOPKG);
383 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
384 assert_return(bus->state == BUS_UNSET, -EPERM);
385 assert_return(!bus_pid_changed(bus), -ECHILD);
387 bus->is_server = !!b;
388 bus->server_id = server_id;
392 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
393 assert_return(bus, -EINVAL);
394 assert_return(bus = bus_resolve(bus), -ENOPKG);
395 assert_return(bus->state == BUS_UNSET, -EPERM);
396 assert_return(!bus_pid_changed(bus), -ECHILD);
398 bus->anonymous_auth = !!b;
402 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
403 assert_return(bus, -EINVAL);
404 assert_return(bus = bus_resolve(bus), -ENOPKG);
405 assert_return(bus->state == BUS_UNSET, -EPERM);
406 assert_return(!bus_pid_changed(bus), -ECHILD);
412 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
413 assert_return(bus, -EINVAL);
414 assert_return(bus = bus_resolve(bus), -ENOPKG);
415 assert_return(bus->state == BUS_UNSET, -EPERM);
416 assert_return(!bus_pid_changed(bus), -ECHILD);
418 return free_and_strdup(&bus->description, description);
421 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
422 assert_return(bus, -EINVAL);
423 assert_return(bus = bus_resolve(bus), -ENOPKG);
424 assert_return(!bus_pid_changed(bus), -ECHILD);
426 bus->allow_interactive_authorization = !!b;
430 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
431 assert_return(bus, -EINVAL);
432 assert_return(bus = bus_resolve(bus), -ENOPKG);
433 assert_return(!bus_pid_changed(bus), -ECHILD);
435 return bus->allow_interactive_authorization;
438 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
439 assert_return(bus, -EINVAL);
440 assert_return(bus = bus_resolve(bus), -ENOPKG);
441 assert_return(bus->state == BUS_UNSET, -EPERM);
442 assert_return(!bus_pid_changed(bus), -ECHILD);
444 bus->watch_bind = !!b;
448 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
449 assert_return(bus, -EINVAL);
450 assert_return(bus = bus_resolve(bus), -ENOPKG);
451 assert_return(!bus_pid_changed(bus), -ECHILD);
453 return bus->watch_bind;
456 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
457 assert_return(bus, -EINVAL);
458 assert_return(bus = bus_resolve(bus), -ENOPKG);
459 assert_return(bus->state == BUS_UNSET, -EPERM);
460 assert_return(!bus_pid_changed(bus), -ECHILD);
462 bus->connected_signal = !!b;
466 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
467 assert_return(bus, -EINVAL);
468 assert_return(bus = bus_resolve(bus), -ENOPKG);
469 assert_return(!bus_pid_changed(bus), -ECHILD);
471 return bus->connected_signal;
474 static int synthesize_connected_signal(sd_bus *bus) {
475 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
480 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
481 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
482 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
484 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
485 * that works independently from whether we connected to a full bus or just a direct connection. */
487 if (!bus->connected_signal)
490 r = sd_bus_message_new_signal(
493 "/org/freedesktop/DBus/Local",
494 "org.freedesktop.DBus.Local",
499 bus_message_set_sender_local(bus, m);
501 r = bus_seal_synthetic_message(bus, m);
505 r = bus_rqueue_make_room(bus);
509 /* Insert at the very front */
510 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
511 bus->rqueue[0] = TAKE_PTR(m);
517 void bus_set_state(sd_bus *bus, enum bus_state state) {
519 static const char * const table[_BUS_STATE_MAX] = {
520 [BUS_UNSET] = "UNSET",
521 [BUS_WATCH_BIND] = "WATCH_BIND",
522 [BUS_OPENING] = "OPENING",
523 [BUS_AUTHENTICATING] = "AUTHENTICATING",
524 [BUS_HELLO] = "HELLO",
525 [BUS_RUNNING] = "RUNNING",
526 [BUS_CLOSING] = "CLOSING",
527 [BUS_CLOSED] = "CLOSED",
531 assert(state < _BUS_STATE_MAX);
533 if (state == bus->state)
536 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
540 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
549 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
551 r = sd_bus_message_get_errno(reply);
555 r = sd_bus_message_read(reply, "s", &s);
559 if (!service_name_is_valid(s) || s[0] != ':')
566 free_and_replace(bus->unique_name, t);
568 if (bus->state == BUS_HELLO) {
569 bus_set_state(bus, BUS_RUNNING);
571 r = synthesize_connected_signal(bus);
579 static int bus_send_hello(sd_bus *bus) {
580 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
585 if (!bus->bus_client)
588 r = sd_bus_message_new_method_call(
591 "org.freedesktop.DBus",
592 "/org/freedesktop/DBus",
593 "org.freedesktop.DBus",
598 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
601 int bus_start_running(sd_bus *bus) {
602 struct reply_callback *c;
608 assert(bus->state < BUS_HELLO);
610 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
611 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
612 * adding a fixed value to all entries should not alter the internal order. */
614 n = now(CLOCK_MONOTONIC);
615 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
616 if (c->timeout_usec == 0)
619 c->timeout_usec = usec_add(n, c->timeout_usec);
622 if (bus->bus_client) {
623 bus_set_state(bus, BUS_HELLO);
627 bus_set_state(bus, BUS_RUNNING);
629 r = synthesize_connected_signal(bus);
636 static int parse_address_key(const char **p, const char *key, char **value) {
637 size_t l, n = 0, allocated = 0;
638 _cleanup_free_ char *r = NULL;
647 if (strncmp(*p, key, l) != 0)
660 while (!IN_SET(*a, ';', ',', 0)) {
674 c = (char) ((x << 4) | y);
681 if (!GREEDY_REALLOC(r, allocated, n + 2))
699 free_and_replace(*value, r);
704 static void skip_address_key(const char **p) {
708 *p += strcspn(*p, ",");
714 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
715 _cleanup_free_ char *path = NULL, *abstract = NULL;
724 while (!IN_SET(**p, 0, ';')) {
725 r = parse_address_key(p, "guid", guid);
731 r = parse_address_key(p, "path", &path);
737 r = parse_address_key(p, "abstract", &abstract);
746 if (!path && !abstract)
749 if (path && abstract)
754 if (l > sizeof(b->sockaddr.un.sun_path))
757 b->sockaddr.un.sun_family = AF_UNIX;
758 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
759 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
760 } else if (abstract) {
761 l = strlen(abstract);
762 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
765 b->sockaddr.un.sun_family = AF_UNIX;
766 b->sockaddr.un.sun_path[0] = 0;
767 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
768 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
776 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
777 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
779 struct addrinfo *result, hints = {
780 .ai_socktype = SOCK_STREAM,
781 .ai_flags = AI_ADDRCONFIG,
789 while (!IN_SET(**p, 0, ';')) {
790 r = parse_address_key(p, "guid", guid);
796 r = parse_address_key(p, "host", &host);
802 r = parse_address_key(p, "port", &port);
808 r = parse_address_key(p, "family", &family);
821 if (streq(family, "ipv4"))
822 hints.ai_family = AF_INET;
823 else if (streq(family, "ipv6"))
824 hints.ai_family = AF_INET6;
829 r = getaddrinfo(host, port, &hints, &result);
833 return -EADDRNOTAVAIL;
835 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
836 b->sockaddr_size = result->ai_addrlen;
838 freeaddrinfo(result);
845 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
847 unsigned n_argv = 0, j;
849 size_t allocated = 0;
857 while (!IN_SET(**p, 0, ';')) {
858 r = parse_address_key(p, "guid", guid);
864 r = parse_address_key(p, "path", &path);
870 if (startswith(*p, "argv")) {
874 ul = strtoul(*p + 4, (char**) p, 10);
875 if (errno > 0 || **p != '=' || ul > 256) {
883 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
891 r = parse_address_key(p, NULL, argv + ul);
906 /* Make sure there are no holes in the array, with the
907 * exception of argv[0] */
908 for (j = 1; j < n_argv; j++)
914 if (argv && argv[0] == NULL) {
915 argv[0] = strdup(path);
930 for (j = 0; j < n_argv; j++)
938 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
939 _cleanup_free_ char *machine = NULL, *pid = NULL;
947 while (!IN_SET(**p, 0, ';')) {
948 r = parse_address_key(p, "guid", guid);
954 r = parse_address_key(p, "machine", &machine);
960 r = parse_address_key(p, "pid", &pid);
969 if (!machine == !pid)
973 if (!machine_name_is_valid(machine))
976 free_and_replace(b->machine, machine);
978 b->machine = mfree(b->machine);
982 r = parse_pid(pid, &b->nspid);
988 b->sockaddr.un.sun_family = AF_UNIX;
989 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
990 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
991 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
997 static void bus_reset_parsed_address(sd_bus *b) {
1001 b->sockaddr_size = 0;
1002 b->exec_argv = strv_free(b->exec_argv);
1003 b->exec_path = mfree(b->exec_path);
1004 b->server_id = SD_ID128_NULL;
1005 b->machine = mfree(b->machine);
1009 static int bus_parse_next_address(sd_bus *b) {
1010 _cleanup_free_ char *guid = NULL;
1018 if (b->address[b->address_index] == 0)
1021 bus_reset_parsed_address(b);
1023 a = b->address + b->address_index;
1032 if (startswith(a, "unix:")) {
1035 r = parse_unix_address(b, &a, &guid);
1040 } else if (startswith(a, "tcp:")) {
1043 r = parse_tcp_address(b, &a, &guid);
1049 } else if (startswith(a, "unixexec:")) {
1052 r = parse_exec_address(b, &a, &guid);
1058 } else if (startswith(a, "x-machine-unix:")) {
1061 r = parse_container_unix_address(b, &a, &guid);
1074 r = sd_id128_from_string(guid, &b->server_id);
1079 b->address_index = a - b->address;
1083 static void bus_kill_exec(sd_bus *bus) {
1084 if (pid_is_valid(bus->busexec_pid) > 0) {
1085 sigterm_wait(bus->busexec_pid);
1086 bus->busexec_pid = 0;
1090 static int bus_start_address(sd_bus *b) {
1096 bus_close_io_fds(b);
1097 bus_close_inotify_fd(b);
1101 /* If you provide multiple different bus-addresses, we
1102 * try all of them in order and use the first one that
1106 r = bus_socket_exec(b);
1107 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1108 r = bus_container_connect_socket(b);
1109 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1110 r = bus_socket_connect(b);
1117 q = bus_attach_io_events(b);
1121 q = bus_attach_inotify_event(b);
1128 b->last_connect_error = -r;
1131 r = bus_parse_next_address(b);
1135 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1139 int bus_next_address(sd_bus *b) {
1142 bus_reset_parsed_address(b);
1143 return bus_start_address(b);
1146 static int bus_start_fd(sd_bus *b) {
1151 assert(b->input_fd >= 0);
1152 assert(b->output_fd >= 0);
1154 r = fd_nonblock(b->input_fd, true);
1158 r = fd_cloexec(b->input_fd, true);
1162 if (b->input_fd != b->output_fd) {
1163 r = fd_nonblock(b->output_fd, true);
1167 r = fd_cloexec(b->output_fd, true);
1172 if (fstat(b->input_fd, &st) < 0)
1175 return bus_socket_take_fd(b);
1178 _public_ int sd_bus_start(sd_bus *bus) {
1181 assert_return(bus, -EINVAL);
1182 assert_return(bus = bus_resolve(bus), -ENOPKG);
1183 assert_return(bus->state == BUS_UNSET, -EPERM);
1184 assert_return(!bus_pid_changed(bus), -ECHILD);
1186 bus_set_state(bus, BUS_OPENING);
1188 if (bus->is_server && bus->bus_client)
1191 if (bus->input_fd >= 0)
1192 r = bus_start_fd(bus);
1193 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1194 r = bus_start_address(bus);
1203 return bus_send_hello(bus);
1206 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1211 assert_return(ret, -EINVAL);
1213 /* Let's connect to the starter bus if it is set, and
1214 * otherwise to the bus that is appropropriate for the scope
1215 * we are running in */
1217 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1219 if (streq(e, "system"))
1220 return sd_bus_open_system_with_description(ret, description);
1221 #if 0 /// elogind does not support systemd user instances
1222 else if (STR_IN_SET(e, "session", "user"))
1224 return sd_bus_open_user_with_description(ret, description);
1227 e = secure_getenv("DBUS_STARTER_ADDRESS");
1229 #if 0 /// elogind does not support systemd user instances
1230 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1231 return sd_bus_open_user_with_description(ret, description);
1234 return sd_bus_open_system_with_description(ret, description);
1241 r = sd_bus_set_address(b, e);
1245 b->bus_client = true;
1247 /* We don't know whether the bus is trusted or not, so better
1248 * be safe, and authenticate everything */
1250 b->is_local = false;
1251 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1253 r = sd_bus_start(b);
1265 _public_ int sd_bus_open(sd_bus **ret) {
1266 return sd_bus_open_with_description(ret, NULL);
1269 int bus_set_address_system(sd_bus *b) {
1273 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1275 return sd_bus_set_address(b, e);
1277 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1280 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1284 assert_return(ret, -EINVAL);
1291 r = sd_bus_set_description(b, description);
1296 r = bus_set_address_system(b);
1300 b->bus_client = true;
1301 b->is_system = true;
1303 /* Let's do per-method access control on the system bus. We
1304 * need the caller's UID and capability set for that. */
1306 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1309 r = sd_bus_start(b);
1321 _public_ int sd_bus_open_system(sd_bus **ret) {
1322 return sd_bus_open_system_with_description(ret, NULL);
1325 #if 0 /// elogind can not open/use a user bus
1326 int bus_set_address_user(sd_bus *b) {
1328 _cleanup_free_ char *ee = NULL, *s = NULL;
1332 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1334 return sd_bus_set_address(b, e);
1336 e = secure_getenv("XDG_RUNTIME_DIR");
1340 ee = bus_address_escape(e);
1344 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1347 b->address = TAKE_PTR(s);
1353 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1354 #if 0 /// elogind does not support user buses
1358 assert_return(ret, -EINVAL);
1365 r = sd_bus_set_description(b, description);
1370 r = bus_set_address_user(b);
1374 b->bus_client = true;
1377 /* We don't do any per-method access control on the user
1382 r = sd_bus_start(b);
1394 _public_ int sd_bus_open_user(sd_bus **ret) {
1395 return sd_bus_open_user_with_description(ret, NULL);
1397 return sd_bus_open_system(ret);
1401 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1402 _cleanup_free_ char *e = NULL;
1403 char *m = NULL, *c = NULL, *a;
1408 /* Let's see if we shall enter some container */
1409 m = strchr(host, ':');
1413 /* Let's make sure this is not a port of some kind,
1414 * and is a valid machine name. */
1415 if (!in_charset(m, DIGITS) && machine_name_is_valid(m)) {
1418 /* Cut out the host part */
1419 t = strndupa(host, m - host - 1);
1420 e = bus_address_escape(t);
1424 c = strjoina(",argv5=--machine=", m);
1429 e = bus_address_escape(host);
1434 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=elogind-stdio-bridge", c);
1438 return free_and_replace(b->address, a);
1441 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1445 assert_return(host, -EINVAL);
1446 assert_return(ret, -EINVAL);
1448 r = sd_bus_new(&bus);
1452 r = bus_set_address_system_remote(bus, host);
1456 bus->bus_client = true;
1457 bus->trusted = false;
1458 bus->is_system = true;
1459 bus->is_local = false;
1461 r = sd_bus_start(bus);
1473 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1474 _cleanup_free_ char *e = NULL;
1480 e = bus_address_escape(machine);
1484 a = strjoin("x-machine-unix:machine=", e);
1488 return free_and_replace(b->address, a);
1491 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1495 assert_return(machine, -EINVAL);
1496 assert_return(ret, -EINVAL);
1497 assert_return(machine_name_is_valid(machine), -EINVAL);
1499 r = sd_bus_new(&bus);
1503 r = bus_set_address_system_machine(bus, machine);
1507 bus->bus_client = true;
1508 bus->trusted = false;
1509 bus->is_system = true;
1510 bus->is_local = false;
1512 r = sd_bus_start(bus);
1524 _public_ void sd_bus_close(sd_bus *bus) {
1528 if (bus->state == BUS_CLOSED)
1530 if (bus_pid_changed(bus))
1533 /* Don't leave ssh hanging around */
1536 bus_set_state(bus, BUS_CLOSED);
1538 sd_bus_detach_event(bus);
1540 /* Drop all queued messages so that they drop references to
1541 * the bus object and the bus may be freed */
1542 bus_reset_queues(bus);
1544 bus_close_io_fds(bus);
1545 bus_close_inotify_fd(bus);
1548 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1553 /* Have to do this before flush() to prevent hang */
1559 return sd_bus_unref(bus);
1562 void bus_enter_closing(sd_bus *bus) {
1565 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1568 bus_set_state(bus, BUS_CLOSING);
1571 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1576 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1581 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1587 i = REFCNT_DEC(bus->n_ref);
1595 _public_ int sd_bus_is_open(sd_bus *bus) {
1597 assert_return(bus, -EINVAL);
1598 assert_return(bus = bus_resolve(bus), -ENOPKG);
1599 assert_return(!bus_pid_changed(bus), -ECHILD);
1601 return BUS_IS_OPEN(bus->state);
1604 _public_ int sd_bus_is_ready(sd_bus *bus) {
1605 assert_return(bus, -EINVAL);
1606 assert_return(bus = bus_resolve(bus), -ENOPKG);
1607 assert_return(!bus_pid_changed(bus), -ECHILD);
1609 return bus->state == BUS_RUNNING;
1612 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1615 assert_return(bus, -EINVAL);
1616 assert_return(bus = bus_resolve(bus), -ENOPKG);
1617 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1618 assert_return(!bus_pid_changed(bus), -ECHILD);
1620 if (bus->is_monitor)
1623 if (type == SD_BUS_TYPE_UNIX_FD) {
1624 if (!bus->accept_fd)
1627 r = bus_ensure_running(bus);
1631 return bus->can_fds;
1634 return bus_type_is_valid(type);
1637 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1640 assert_return(bus, -EINVAL);
1641 assert_return(bus = bus_resolve(bus), -ENOPKG);
1642 assert_return(id, -EINVAL);
1643 assert_return(!bus_pid_changed(bus), -ECHILD);
1645 r = bus_ensure_running(bus);
1649 *id = bus->server_id;
1653 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1660 /* If we copy the same message to multiple
1661 * destinations, avoid using the same cookie
1663 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1668 timeout = BUS_DEFAULT_TIMEOUT;
1670 if (!m->sender && b->patch_sender) {
1671 r = sd_bus_message_set_sender(m, b->patch_sender);
1676 return sd_bus_message_seal(m, ++b->cookie, timeout);
1679 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1680 bool remarshal = false;
1684 /* wrong packet version */
1685 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1688 /* wrong packet endianness */
1689 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1692 return remarshal ? bus_message_remarshal(b, m) : 0;
1695 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1699 /* Fake some timestamps, if they were requested, and not
1700 * already initialized */
1701 if (b->attach_timestamp) {
1702 if (m->realtime <= 0)
1703 m->realtime = now(CLOCK_REALTIME);
1705 if (m->monotonic <= 0)
1706 m->monotonic = now(CLOCK_MONOTONIC);
1709 /* The bus specification says the serial number cannot be 0,
1710 * hence let's fill something in for synthetic messages. Since
1711 * synthetic messages might have a fake sender and we don't
1712 * want to interfere with the real sender's serial numbers we
1713 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1714 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1715 * even though kdbus can do 64bit. */
1716 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1719 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1725 r = bus_socket_write_message(bus, m, idx);
1729 if (*idx >= BUS_MESSAGE_SIZE(m))
1730 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",
1731 bus_message_type_to_string(m->header->type),
1732 strna(sd_bus_message_get_sender(m)),
1733 strna(sd_bus_message_get_destination(m)),
1734 strna(sd_bus_message_get_path(m)),
1735 strna(sd_bus_message_get_interface(m)),
1736 strna(sd_bus_message_get_member(m)),
1737 BUS_MESSAGE_COOKIE(m),
1739 strna(m->root_container.signature),
1740 strna(m->error.name),
1741 strna(m->error.message));
1746 static int dispatch_wqueue(sd_bus *bus) {
1750 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1752 while (bus->wqueue_size > 0) {
1754 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1758 /* Didn't do anything this time */
1760 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1761 /* Fully written. Let's drop the entry from
1764 * This isn't particularly optimized, but
1765 * well, this is supposed to be our worst-case
1766 * buffer only, and the socket buffer is
1767 * supposed to be our primary buffer, and if
1768 * it got full, then all bets are off
1772 sd_bus_message_unref(bus->wqueue[0]);
1773 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1783 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1786 return bus_socket_read_message(bus);
1789 int bus_rqueue_make_room(sd_bus *bus) {
1792 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1795 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1801 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1806 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1808 /* Note that the priority logic is only available on kdbus,
1809 * where the rqueue is unused. We check the rqueue here
1810 * anyway, because it's simple... */
1813 if (bus->rqueue_size > 0) {
1814 /* Dispatch a queued message */
1816 *m = bus->rqueue[0];
1818 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1822 /* Try to read a new message */
1823 r = bus_read_message(bus, hint_priority, priority);
1833 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1834 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1837 assert_return(m, -EINVAL);
1842 assert_return(!bus_pid_changed(bus), -ECHILD);
1844 if (!BUS_IS_OPEN(bus->state))
1848 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1855 /* If the cookie number isn't kept, then we know that no reply
1857 if (!cookie && !m->sealed)
1858 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1860 r = bus_seal_message(bus, m, 0);
1864 /* Remarshall if we have to. This will possibly unref the
1865 * message and place a replacement in m */
1866 r = bus_remarshal_message(bus, &m);
1870 /* If this is a reply and no reply was requested, then let's
1871 * suppress this, if we can */
1875 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1878 r = bus_write_message(bus, m, &idx);
1880 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1881 bus_enter_closing(bus);
1888 if (idx < BUS_MESSAGE_SIZE(m)) {
1889 /* Wasn't fully written. So let's remember how
1890 * much was written. Note that the first entry
1891 * of the wqueue array is always allocated so
1892 * that we always can remember how much was
1894 bus->wqueue[0] = sd_bus_message_ref(m);
1895 bus->wqueue_size = 1;
1900 /* Just append it to the queue. */
1902 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1905 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1908 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1913 *cookie = BUS_MESSAGE_COOKIE(m);
1918 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1921 assert_return(m, -EINVAL);
1926 assert_return(!bus_pid_changed(bus), -ECHILD);
1928 if (!BUS_IS_OPEN(bus->state))
1931 if (!streq_ptr(m->destination, destination)) {
1936 r = sd_bus_message_set_destination(m, destination);
1941 return sd_bus_send(bus, m, cookie);
1944 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1947 if (usec == (uint64_t) -1)
1950 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1951 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1952 * relative timestamp, and afterwards the absolute one. */
1954 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1957 return now(CLOCK_MONOTONIC) + usec;
1960 static int timeout_compare(const void *a, const void *b) {
1961 const struct reply_callback *x = a, *y = b;
1963 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1966 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1969 if (x->timeout_usec < y->timeout_usec)
1972 if (x->timeout_usec > y->timeout_usec)
1978 _public_ int sd_bus_call_async(
1982 sd_bus_message_handler_t callback,
1986 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1987 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1990 assert_return(m, -EINVAL);
1991 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1992 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
1997 assert_return(!bus_pid_changed(bus), -ECHILD);
1999 if (!BUS_IS_OPEN(bus->state))
2002 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
2003 if (!callback && !slot && !m->sealed)
2004 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
2006 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
2010 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
2014 r = bus_seal_message(bus, m, usec);
2018 r = bus_remarshal_message(bus, &m);
2022 if (slot || callback) {
2023 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2027 s->reply_callback.callback = callback;
2029 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2030 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2032 s->reply_callback.cookie = 0;
2036 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2037 if (s->reply_callback.timeout_usec != 0) {
2038 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2040 s->reply_callback.timeout_usec = 0;
2046 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2057 int bus_ensure_running(sd_bus *bus) {
2062 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2064 if (bus->state == BUS_RUNNING)
2068 r = sd_bus_process(bus, NULL);
2071 if (bus->state == BUS_RUNNING)
2076 r = sd_bus_wait(bus, (uint64_t) -1);
2082 _public_ int sd_bus_call(
2086 sd_bus_error *error,
2087 sd_bus_message **reply) {
2089 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2095 bus_assert_return(m, -EINVAL, error);
2096 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2097 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2098 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2103 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2105 if (!BUS_IS_OPEN(bus->state)) {
2110 r = bus_ensure_running(bus);
2114 i = bus->rqueue_size;
2116 r = bus_seal_message(bus, m, usec);
2120 r = bus_remarshal_message(bus, &m);
2124 r = sd_bus_send(bus, m, &cookie);
2128 timeout = calc_elapse(bus, m->timeout);
2133 while (i < bus->rqueue_size) {
2134 sd_bus_message *incoming = NULL;
2136 incoming = bus->rqueue[i];
2138 if (incoming->reply_cookie == cookie) {
2139 /* Found a match! */
2141 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2143 log_debug_bus_message(incoming);
2145 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2147 if (incoming->n_fds <= 0 || bus->accept_fd) {
2151 sd_bus_message_unref(incoming);
2156 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2157 sd_bus_message_unref(incoming);
2160 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2161 r = sd_bus_error_copy(error, &incoming->error);
2162 sd_bus_message_unref(incoming);
2169 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2172 streq(bus->unique_name, incoming->sender)) {
2174 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2177 /* Our own message? Somebody is trying
2178 * to send its own client a message,
2179 * let's not dead-lock, let's fail
2182 sd_bus_message_unref(incoming);
2187 /* Try to read more, right-away */
2191 r = bus_read_message(bus, false, 0);
2193 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2194 bus_enter_closing(bus);
2206 n = now(CLOCK_MONOTONIC);
2214 left = (uint64_t) -1;
2216 r = bus_poll(bus, true, left);
2224 r = dispatch_wqueue(bus);
2226 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2227 bus_enter_closing(bus);
2236 return sd_bus_error_set_errno(error, r);
2239 _public_ int sd_bus_get_fd(sd_bus *bus) {
2241 assert_return(bus, -EINVAL);
2242 assert_return(bus = bus_resolve(bus), -ENOPKG);
2243 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2244 assert_return(!bus_pid_changed(bus), -ECHILD);
2246 if (bus->state == BUS_CLOSED)
2249 if (bus->inotify_fd >= 0)
2250 return bus->inotify_fd;
2252 if (bus->input_fd >= 0)
2253 return bus->input_fd;
2258 _public_ int sd_bus_get_events(sd_bus *bus) {
2261 assert_return(bus, -EINVAL);
2262 assert_return(bus = bus_resolve(bus), -ENOPKG);
2263 assert_return(!bus_pid_changed(bus), -ECHILD);
2265 switch (bus->state) {
2271 case BUS_WATCH_BIND:
2279 case BUS_AUTHENTICATING:
2280 if (bus_socket_auth_needs_write(bus))
2288 if (bus->rqueue_size <= 0)
2290 if (bus->wqueue_size > 0)
2298 assert_not_reached("Unknown state");
2304 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2305 struct reply_callback *c;
2307 assert_return(bus, -EINVAL);
2308 assert_return(bus = bus_resolve(bus), -ENOPKG);
2309 assert_return(timeout_usec, -EINVAL);
2310 assert_return(!bus_pid_changed(bus), -ECHILD);
2312 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2315 if (bus->track_queue) {
2320 switch (bus->state) {
2322 case BUS_AUTHENTICATING:
2323 *timeout_usec = bus->auth_timeout;
2328 if (bus->rqueue_size > 0) {
2333 c = prioq_peek(bus->reply_callbacks_prioq);
2335 *timeout_usec = (uint64_t) -1;
2339 if (c->timeout_usec == 0) {
2340 *timeout_usec = (uint64_t) -1;
2344 *timeout_usec = c->timeout_usec;
2351 case BUS_WATCH_BIND:
2353 *timeout_usec = (uint64_t) -1;
2357 assert_not_reached("Unknown or unexpected stat");
2361 static int process_timeout(sd_bus *bus) {
2362 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2363 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2364 struct reply_callback *c;
2371 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2373 c = prioq_peek(bus->reply_callbacks_prioq);
2377 n = now(CLOCK_MONOTONIC);
2378 if (c->timeout_usec > n)
2381 r = bus_message_new_synthetic_error(
2384 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2389 r = bus_seal_synthetic_message(bus, m);
2393 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2394 c->timeout_usec = 0;
2396 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2399 slot = container_of(c, sd_bus_slot, reply_callback);
2401 bus->iteration_counter++;
2403 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2405 bus->current_message = m;
2406 bus->current_slot = sd_bus_slot_ref(slot);
2407 bus->current_handler = c->callback;
2408 bus->current_userdata = slot->userdata;
2409 r = c->callback(m, slot->userdata, &error_buffer);
2410 bus->current_userdata = NULL;
2411 bus->current_handler = NULL;
2412 bus->current_slot = NULL;
2413 bus->current_message = NULL;
2415 if (slot->floating) {
2416 bus_slot_disconnect(slot);
2417 sd_bus_slot_unref(slot);
2420 sd_bus_slot_unref(slot);
2422 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2423 * and ignore the callback handler's return value. */
2427 return bus_maybe_reply_error(m, r, &error_buffer);
2430 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2434 if (bus->state != BUS_HELLO)
2437 /* Let's make sure the first message on the bus is the HELLO
2438 * reply. But note that we don't actually parse the message
2439 * here (we leave that to the usual handling), we just verify
2440 * we don't let any earlier msg through. */
2442 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2445 if (m->reply_cookie != 1)
2451 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2452 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2453 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2454 struct reply_callback *c;
2462 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2465 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2468 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2474 slot = container_of(c, sd_bus_slot, reply_callback);
2476 if (m->n_fds > 0 && !bus->accept_fd) {
2478 /* If the reply contained a file descriptor which we
2479 * didn't want we pass an error instead. */
2481 r = bus_message_new_synthetic_error(
2484 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2489 /* Copy over original timestamp */
2490 synthetic_reply->realtime = m->realtime;
2491 synthetic_reply->monotonic = m->monotonic;
2492 synthetic_reply->seqnum = m->seqnum;
2494 r = bus_seal_synthetic_message(bus, synthetic_reply);
2498 m = synthetic_reply;
2500 r = sd_bus_message_rewind(m, true);
2505 if (c->timeout_usec != 0) {
2506 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2507 c->timeout_usec = 0;
2510 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2512 bus->current_slot = sd_bus_slot_ref(slot);
2513 bus->current_handler = c->callback;
2514 bus->current_userdata = slot->userdata;
2515 r = c->callback(m, slot->userdata, &error_buffer);
2516 bus->current_userdata = NULL;
2517 bus->current_handler = NULL;
2518 bus->current_slot = NULL;
2520 if (slot->floating) {
2521 bus_slot_disconnect(slot);
2522 sd_bus_slot_unref(slot);
2525 sd_bus_slot_unref(slot);
2527 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2528 * ignore the callback handler's return value. */
2532 return bus_maybe_reply_error(m, r, &error_buffer);
2535 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2536 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2537 struct filter_callback *l;
2544 bus->filter_callbacks_modified = false;
2546 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2549 if (bus->filter_callbacks_modified)
2552 /* Don't run this more than once per iteration */
2553 if (l->last_iteration == bus->iteration_counter)
2556 l->last_iteration = bus->iteration_counter;
2558 r = sd_bus_message_rewind(m, true);
2562 slot = container_of(l, sd_bus_slot, filter_callback);
2564 bus->current_slot = sd_bus_slot_ref(slot);
2565 bus->current_handler = l->callback;
2566 bus->current_userdata = slot->userdata;
2567 r = l->callback(m, slot->userdata, &error_buffer);
2568 bus->current_userdata = NULL;
2569 bus->current_handler = NULL;
2570 bus->current_slot = sd_bus_slot_unref(slot);
2572 r = bus_maybe_reply_error(m, r, &error_buffer);
2578 } while (bus->filter_callbacks_modified);
2583 static int process_match(sd_bus *bus, sd_bus_message *m) {
2590 bus->match_callbacks_modified = false;
2592 r = bus_match_run(bus, &bus->match_callbacks, m);
2596 } while (bus->match_callbacks_modified);
2601 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2602 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2608 if (bus->is_monitor)
2611 if (bus->manual_peer_interface)
2614 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2617 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2620 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2623 if (streq_ptr(m->member, "Ping"))
2624 r = sd_bus_message_new_method_return(m, &reply);
2625 else if (streq_ptr(m->member, "GetMachineId")) {
2629 r = sd_id128_get_machine(&id);
2633 r = sd_bus_message_new_method_return(m, &reply);
2637 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2639 r = sd_bus_message_new_method_errorf(
2641 SD_BUS_ERROR_UNKNOWN_METHOD,
2642 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2648 r = sd_bus_send(bus, reply, NULL);
2655 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2659 /* If we got a message with a file descriptor which we didn't
2660 * want to accept, then let's drop it. How can this even
2661 * happen? For example, when the kernel queues a message into
2662 * an activatable names's queue which allows fds, and then is
2663 * delivered to us later even though we ourselves did not
2666 if (bus->is_monitor)
2675 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2676 return 1; /* just eat it up */
2678 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2681 static int process_message(sd_bus *bus, sd_bus_message *m) {
2687 bus->current_message = m;
2688 bus->iteration_counter++;
2690 log_debug_bus_message(m);
2692 r = process_hello(bus, m);
2696 r = process_reply(bus, m);
2700 r = process_fd_check(bus, m);
2704 r = process_filter(bus, m);
2708 r = process_match(bus, m);
2712 r = process_builtin(bus, m);
2716 r = bus_process_object(bus, m);
2719 bus->current_message = NULL;
2723 static int dispatch_track(sd_bus *bus) {
2726 if (!bus->track_queue)
2729 bus_track_dispatch(bus->track_queue);
2733 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2734 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2738 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2740 r = process_timeout(bus);
2744 r = dispatch_wqueue(bus);
2748 r = dispatch_track(bus);
2752 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2758 r = process_message(bus, m);
2763 r = sd_bus_message_rewind(m, true);
2772 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2774 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2775 strna(sd_bus_message_get_sender(m)),
2776 strna(sd_bus_message_get_path(m)),
2777 strna(sd_bus_message_get_interface(m)),
2778 strna(sd_bus_message_get_member(m)));
2780 r = sd_bus_reply_method_errorf(
2782 SD_BUS_ERROR_UNKNOWN_OBJECT,
2783 "Unknown object '%s'.", m->path);
2797 static int bus_exit_now(sd_bus *bus) {
2800 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2801 * sd_event_exit(), otherwise invokes libc exit(). */
2803 if (bus->exited) /* did we already exit? */
2805 if (!bus->exit_triggered) /* was the exit condition triggered? */
2807 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2810 bus->exited = true; /* never exit more than once */
2812 log_debug("Bus connection disconnected, exiting.");
2815 return sd_event_exit(bus->event, EXIT_FAILURE);
2819 assert_not_reached("exit() didn't exit?");
2822 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2823 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2824 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2831 r = bus_message_new_synthetic_error(
2834 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2839 r = bus_seal_synthetic_message(bus, m);
2843 if (c->timeout_usec != 0) {
2844 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2845 c->timeout_usec = 0;
2848 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2851 slot = container_of(c, sd_bus_slot, reply_callback);
2853 bus->iteration_counter++;
2855 bus->current_message = m;
2856 bus->current_slot = sd_bus_slot_ref(slot);
2857 bus->current_handler = c->callback;
2858 bus->current_userdata = slot->userdata;
2859 r = c->callback(m, slot->userdata, &error_buffer);
2860 bus->current_userdata = NULL;
2861 bus->current_handler = NULL;
2862 bus->current_slot = NULL;
2863 bus->current_message = NULL;
2865 if (slot->floating) {
2866 bus_slot_disconnect(slot);
2867 sd_bus_slot_unref(slot);
2870 sd_bus_slot_unref(slot);
2872 return bus_maybe_reply_error(m, r, &error_buffer);
2875 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2876 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2877 struct reply_callback *c;
2881 assert(bus->state == BUS_CLOSING);
2883 /* First, fail all outstanding method calls */
2884 c = ordered_hashmap_first(bus->reply_callbacks);
2886 return process_closing_reply_callback(bus, c);
2888 /* Then, fake-drop all remaining bus tracking references */
2890 bus_track_close(bus->tracks);
2894 /* Then, synthesize a Disconnected message */
2895 r = sd_bus_message_new_signal(
2898 "/org/freedesktop/DBus/Local",
2899 "org.freedesktop.DBus.Local",
2904 bus_message_set_sender_local(bus, m);
2906 r = bus_seal_synthetic_message(bus, m);
2912 bus->current_message = m;
2913 bus->iteration_counter++;
2915 r = process_filter(bus, m);
2919 r = process_match(bus, m);
2923 /* Nothing else to do, exit now, if the condition holds */
2924 bus->exit_triggered = true;
2925 (void) bus_exit_now(bus);
2933 bus->current_message = NULL;
2938 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2939 BUS_DONT_DESTROY(bus);
2942 /* Returns 0 when we didn't do anything. This should cause the
2943 * caller to invoke sd_bus_wait() before returning the next
2944 * time. Returns > 0 when we did something, which possibly
2945 * means *ret is filled in with an unprocessed message. */
2947 assert_return(bus, -EINVAL);
2948 assert_return(bus = bus_resolve(bus), -ENOPKG);
2949 assert_return(!bus_pid_changed(bus), -ECHILD);
2951 /* We don't allow recursively invoking sd_bus_process(). */
2952 assert_return(!bus->current_message, -EBUSY);
2953 assert(!bus->current_slot);
2955 switch (bus->state) {
2963 case BUS_WATCH_BIND:
2964 r = bus_socket_process_watch_bind(bus);
2968 r = bus_socket_process_opening(bus);
2971 case BUS_AUTHENTICATING:
2972 r = bus_socket_process_authenticating(bus);
2977 r = process_running(bus, hint_priority, priority, ret);
2981 /* This branch initializes *ret, hence we don't use the generic error checking below */
2985 return process_closing(bus, ret);
2988 assert_not_reached("Unknown state");
2991 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2992 bus_enter_closing(bus);
3003 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
3004 return bus_process_internal(bus, false, 0, ret);
3007 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
3008 return bus_process_internal(bus, true, priority, ret);
3011 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
3012 struct pollfd p[2] = {};
3015 usec_t m = USEC_INFINITY;
3019 if (bus->state == BUS_CLOSING)
3022 if (!BUS_IS_OPEN(bus->state))
3025 if (bus->state == BUS_WATCH_BIND) {
3026 assert(bus->inotify_fd >= 0);
3028 p[0].events = POLLIN;
3029 p[0].fd = bus->inotify_fd;
3034 e = sd_bus_get_events(bus);
3039 /* The caller really needs some more data, he doesn't
3040 * care about what's already read, or any timeouts
3041 * except its own. */
3045 /* The caller wants to process if there's something to
3046 * process, but doesn't care otherwise */
3048 r = sd_bus_get_timeout(bus, &until);
3052 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3055 p[0].fd = bus->input_fd;
3056 if (bus->output_fd == bus->input_fd) {
3060 p[0].events = e & POLLIN;
3061 p[1].fd = bus->output_fd;
3062 p[1].events = e & POLLOUT;
3067 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3070 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3074 return r > 0 ? 1 : 0;
3077 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3079 assert_return(bus, -EINVAL);
3080 assert_return(bus = bus_resolve(bus), -ENOPKG);
3081 assert_return(!bus_pid_changed(bus), -ECHILD);
3083 if (bus->state == BUS_CLOSING)
3086 if (!BUS_IS_OPEN(bus->state))
3089 if (bus->rqueue_size > 0)
3092 return bus_poll(bus, false, timeout_usec);
3095 _public_ int sd_bus_flush(sd_bus *bus) {
3098 assert_return(bus, -EINVAL);
3099 assert_return(bus = bus_resolve(bus), -ENOPKG);
3100 assert_return(!bus_pid_changed(bus), -ECHILD);
3102 if (bus->state == BUS_CLOSING)
3105 if (!BUS_IS_OPEN(bus->state))
3108 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3109 if (bus->state == BUS_WATCH_BIND)
3112 r = bus_ensure_running(bus);
3116 if (bus->wqueue_size <= 0)
3120 r = dispatch_wqueue(bus);
3122 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3123 bus_enter_closing(bus);
3130 if (bus->wqueue_size <= 0)
3133 r = bus_poll(bus, false, (uint64_t) -1);
3139 _public_ int sd_bus_add_filter(
3142 sd_bus_message_handler_t callback,
3147 assert_return(bus, -EINVAL);
3148 assert_return(bus = bus_resolve(bus), -ENOPKG);
3149 assert_return(callback, -EINVAL);
3150 assert_return(!bus_pid_changed(bus), -ECHILD);
3152 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3156 s->filter_callback.callback = callback;
3158 bus->filter_callbacks_modified = true;
3159 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3167 static int add_match_callback(
3170 sd_bus_error *ret_error) {
3172 sd_bus_slot *match_slot = userdata;
3173 bool failed = false;
3179 sd_bus_slot_ref(match_slot);
3181 if (sd_bus_message_is_method_error(m, NULL)) {
3182 log_debug_errno(sd_bus_message_get_errno(m),
3183 "Unable to add match %s, failing connection: %s",
3184 match_slot->match_callback.match_string,
3185 sd_bus_message_get_error(m)->message);
3189 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3191 if (match_slot->match_callback.install_callback) {
3194 bus = sd_bus_message_get_bus(m);
3196 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3197 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3200 assert(bus->current_slot == match_slot->match_callback.install_slot);
3201 assert(bus->current_handler == add_match_callback);
3202 assert(bus->current_userdata == userdata);
3204 bus->current_slot = match_slot;
3205 bus->current_handler = match_slot->match_callback.install_callback;
3206 bus->current_userdata = match_slot->userdata;
3208 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3210 bus->current_slot = match_slot->match_callback.install_slot;
3211 bus->current_handler = add_match_callback;
3212 bus->current_userdata = userdata;
3214 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3216 if (failed) /* Generic failure handling: destroy the connection */
3217 bus_enter_closing(sd_bus_message_get_bus(m));
3222 if (failed && match_slot->floating) {
3223 bus_slot_disconnect(match_slot);
3224 sd_bus_slot_unref(match_slot);
3227 sd_bus_slot_unref(match_slot);
3232 static int bus_add_match_full(
3237 sd_bus_message_handler_t callback,
3238 sd_bus_message_handler_t install_callback,
3241 struct bus_match_component *components = NULL;
3242 unsigned n_components = 0;
3243 sd_bus_slot *s = NULL;
3246 assert_return(bus, -EINVAL);
3247 assert_return(bus = bus_resolve(bus), -ENOPKG);
3248 assert_return(match, -EINVAL);
3249 assert_return(!bus_pid_changed(bus), -ECHILD);
3251 r = bus_match_parse(match, &components, &n_components);
3255 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3261 s->match_callback.callback = callback;
3262 s->match_callback.install_callback = install_callback;
3264 if (bus->bus_client) {
3265 enum bus_match_scope scope;
3267 scope = bus_match_get_scope(components, n_components);
3269 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3270 if (scope != BUS_MATCH_LOCAL) {
3272 /* We store the original match string, so that we can use it to remove the match again. */
3274 s->match_callback.match_string = strdup(match);
3275 if (!s->match_callback.match_string) {
3281 r = bus_add_match_internal_async(bus,
3282 &s->match_callback.install_slot,
3283 s->match_callback.match_string,
3287 r = bus_add_match_internal(bus, s->match_callback.match_string);
3291 s->match_added = true;
3295 bus->match_callbacks_modified = true;
3296 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3305 bus_match_parse_free(components, n_components);
3306 sd_bus_slot_unref(s);
3311 #if 0 /// UNNEEDED by elogind
3313 _public_ int sd_bus_add_match(
3317 sd_bus_message_handler_t callback,
3320 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3323 _public_ int sd_bus_add_match_async(
3327 sd_bus_message_handler_t callback,
3328 sd_bus_message_handler_t install_callback,
3331 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3334 bool bus_pid_changed(sd_bus *bus) {
3337 /* We don't support people creating a bus connection and
3338 * keeping it around over a fork(). Let's complain. */
3340 return bus->original_pid != getpid_cached();
3343 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3344 sd_bus *bus = userdata;
3349 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3351 r = sd_bus_process(bus, NULL);
3353 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3354 bus_enter_closing(bus);
3360 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3361 sd_bus *bus = userdata;
3366 r = sd_bus_process(bus, NULL);
3368 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3369 bus_enter_closing(bus);
3375 static int prepare_callback(sd_event_source *s, void *userdata) {
3376 sd_bus *bus = userdata;
3383 e = sd_bus_get_events(bus);
3389 if (bus->output_fd != bus->input_fd) {
3391 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3395 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3397 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3401 r = sd_bus_get_timeout(bus, &until);
3407 j = sd_event_source_set_time(bus->time_event_source, until);
3414 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3421 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3422 bus_enter_closing(bus);
3427 static int quit_callback(sd_event_source *event, void *userdata) {
3428 sd_bus *bus = userdata;
3438 int bus_attach_io_events(sd_bus *bus) {
3443 if (bus->input_fd < 0)
3449 if (!bus->input_io_event_source) {
3450 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3454 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3458 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3462 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3464 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3469 if (bus->output_fd != bus->input_fd) {
3470 assert(bus->output_fd >= 0);
3472 if (!bus->output_io_event_source) {
3473 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3477 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3481 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3483 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3492 static void bus_detach_io_events(sd_bus *bus) {
3495 if (bus->input_io_event_source) {
3496 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3497 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3500 if (bus->output_io_event_source) {
3501 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3502 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3506 int bus_attach_inotify_event(sd_bus *bus) {
3511 if (bus->inotify_fd < 0)
3517 if (!bus->inotify_event_source) {
3518 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3522 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3526 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3528 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3535 static void bus_detach_inotify_event(sd_bus *bus) {
3538 if (bus->inotify_event_source) {
3539 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3540 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3544 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3547 assert_return(bus, -EINVAL);
3548 assert_return(bus = bus_resolve(bus), -ENOPKG);
3549 assert_return(!bus->event, -EBUSY);
3551 assert(!bus->input_io_event_source);
3552 assert(!bus->output_io_event_source);
3553 assert(!bus->time_event_source);
3556 bus->event = sd_event_ref(event);
3558 r = sd_event_default(&bus->event);
3563 bus->event_priority = priority;
3565 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3569 r = sd_event_source_set_priority(bus->time_event_source, priority);
3573 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3577 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3581 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3585 r = bus_attach_io_events(bus);
3589 r = bus_attach_inotify_event(bus);
3596 sd_bus_detach_event(bus);
3600 _public_ int sd_bus_detach_event(sd_bus *bus) {
3601 assert_return(bus, -EINVAL);
3602 assert_return(bus = bus_resolve(bus), -ENOPKG);
3607 bus_detach_io_events(bus);
3608 bus_detach_inotify_event(bus);
3610 if (bus->time_event_source) {
3611 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3612 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3615 if (bus->quit_event_source) {
3616 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3617 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3620 bus->event = sd_event_unref(bus->event);
3624 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3625 assert_return(bus, NULL);
3630 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3631 assert_return(bus, NULL);
3633 return bus->current_message;
3636 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3637 assert_return(bus, NULL);
3639 return bus->current_slot;
3642 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3643 assert_return(bus, NULL);
3645 return bus->current_handler;
3648 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3649 assert_return(bus, NULL);
3651 return bus->current_userdata;
3654 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3659 assert(default_bus);
3662 return !!*default_bus;
3665 *ret = sd_bus_ref(*default_bus);
3673 b->default_bus_ptr = default_bus;
3681 _public_ int sd_bus_default_system(sd_bus **ret) {
3682 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3685 _public_ int sd_bus_default_user(sd_bus **ret) {
3686 #if 0 /// elogind does not support user buses
3687 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3689 return sd_bus_default_system(ret);
3693 _public_ int sd_bus_default(sd_bus **ret) {
3694 int (*bus_open)(sd_bus **) = NULL;
3697 busp = bus_choose_default(&bus_open);
3698 return bus_default(bus_open, busp, ret);
3701 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3702 assert_return(b, -EINVAL);
3703 assert_return(tid, -EINVAL);
3704 assert_return(!bus_pid_changed(b), -ECHILD);
3712 return sd_event_get_tid(b->event, tid);
3717 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3718 _cleanup_free_ char *e = NULL;
3721 assert_return(object_path_is_valid(prefix), -EINVAL);
3722 assert_return(external_id, -EINVAL);
3723 assert_return(ret_path, -EINVAL);
3725 e = bus_label_escape(external_id);
3729 ret = strjoin(prefix, "/", e);
3737 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3741 assert_return(object_path_is_valid(path), -EINVAL);
3742 assert_return(object_path_is_valid(prefix), -EINVAL);
3743 assert_return(external_id, -EINVAL);
3745 e = object_path_startswith(path, prefix);
3747 *external_id = NULL;
3751 ret = bus_label_unescape(e);
3759 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3760 _cleanup_strv_free_ char **labels = NULL;
3761 char *path, *path_pos, **label_pos;
3762 const char *sep, *template_pos;
3767 assert_return(out, -EINVAL);
3768 assert_return(path_template, -EINVAL);
3770 path_length = strlen(path_template);
3772 va_start(list, path_template);
3773 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3777 arg = va_arg(list, const char *);
3783 label = bus_label_escape(arg);
3789 r = strv_consume(&labels, label);
3795 /* add label length, but account for the format character */
3796 path_length += strlen(label) - 1;
3800 path = malloc(path_length + 1);
3807 for (template_pos = path_template; *template_pos; ) {
3808 sep = strchrnul(template_pos, '%');
3809 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3813 path_pos = stpcpy(path_pos, *label_pos++);
3814 template_pos = sep + 1;
3822 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3823 _cleanup_strv_free_ char **labels = NULL;
3824 const char *template_pos, *path_pos;
3830 * This decodes an object-path based on a template argument. The
3831 * template consists of a verbatim path, optionally including special
3834 * - Each occurrence of '%' in the template matches an arbitrary
3835 * substring of a label in the given path. At most one such
3836 * directive is allowed per label. For each such directive, the
3837 * caller must provide an output parameter (char **) via va_arg. If
3838 * NULL is passed, the given label is verified, but not returned.
3839 * For each matched label, the *decoded* label is stored in the
3840 * passed output argument, and the caller is responsible to free
3841 * it. Note that the output arguments are only modified if the
3842 * actualy path matched the template. Otherwise, they're left
3845 * This function returns <0 on error, 0 if the path does not match the
3846 * template, 1 if it matched.
3849 assert_return(path, -EINVAL);
3850 assert_return(path_template, -EINVAL);
3854 for (template_pos = path_template; *template_pos; ) {
3859 /* verify everything until the next '%' matches verbatim */
3860 sep = strchrnul(template_pos, '%');
3861 length = sep - template_pos;
3862 if (strncmp(path_pos, template_pos, length))
3866 template_pos += length;
3871 /* We found the next '%' character. Everything up until here
3872 * matched. We now skip ahead to the end of this label and make
3873 * sure it matches the tail of the label in the path. Then we
3874 * decode the string in-between and save it for later use. */
3876 ++template_pos; /* skip over '%' */
3878 sep = strchrnul(template_pos, '/');
3879 length = sep - template_pos; /* length of suffix to match verbatim */
3881 /* verify the suffixes match */
3882 sep = strchrnul(path_pos, '/');
3883 if (sep - path_pos < (ssize_t)length ||
3884 strncmp(sep - length, template_pos, length))
3887 template_pos += length; /* skip over matched label */
3888 length = sep - path_pos - length; /* length of sub-label to decode */
3890 /* store unescaped label for later use */
3891 label = bus_label_unescape_n(path_pos, length);
3895 r = strv_consume(&labels, label);
3899 path_pos = sep; /* skip decoded label and suffix */
3902 /* end of template must match end of path */
3906 /* copy the labels over to the caller */
3907 va_start(list, path_template);
3908 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3911 arg = va_arg(list, char **);
3919 labels = mfree(labels);
3923 _public_ int sd_bus_try_close(sd_bus *bus) {
3924 assert_return(bus, -EINVAL);
3925 assert_return(bus = bus_resolve(bus), -ENOPKG);
3926 assert_return(!bus_pid_changed(bus), -ECHILD);
3931 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3932 assert_return(bus, -EINVAL);
3933 assert_return(bus = bus_resolve(bus), -ENOPKG);
3934 assert_return(description, -EINVAL);
3935 assert_return(bus->description, -ENXIO);
3936 assert_return(!bus_pid_changed(bus), -ECHILD);
3938 if (bus->description)
3939 *description = bus->description;
3940 else if (bus->is_system)
3941 *description = "system";
3942 else if (bus->is_user)
3943 *description = "user";
3945 *description = NULL;
3950 int bus_get_root_path(sd_bus *bus) {
3953 if (bus->cgroup_root)
3956 r = cg_get_root_path(&bus->cgroup_root);
3958 bus->cgroup_root = strdup("/");
3959 if (!bus->cgroup_root)
3968 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3969 assert_return(bus, -EINVAL);
3970 assert_return(bus = bus_resolve(bus), -ENOPKG);
3971 assert_return(scope, -EINVAL);
3972 assert_return(!bus_pid_changed(bus), -ECHILD);
3979 if (bus->is_system) {
3987 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3989 assert_return(bus, -EINVAL);
3990 assert_return(bus = bus_resolve(bus), -ENOPKG);
3991 assert_return(address, -EINVAL);
3992 assert_return(!bus_pid_changed(bus), -ECHILD);
3995 *address = bus->address;
4002 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
4003 assert_return(bus, -EINVAL);
4004 assert_return(bus = bus_resolve(bus), -ENOPKG);
4005 assert_return(mask, -EINVAL);
4006 assert_return(!bus_pid_changed(bus), -ECHILD);
4008 *mask = bus->creds_mask;
4012 _public_ int sd_bus_is_bus_client(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->bus_client;
4020 _public_ int sd_bus_is_server(sd_bus *bus) {
4021 assert_return(bus, -EINVAL);
4022 assert_return(bus = bus_resolve(bus), -ENOPKG);
4023 assert_return(!bus_pid_changed(bus), -ECHILD);
4025 return bus->is_server;
4028 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4029 assert_return(bus, -EINVAL);
4030 assert_return(bus = bus_resolve(bus), -ENOPKG);
4031 assert_return(!bus_pid_changed(bus), -ECHILD);
4033 return bus->anonymous_auth;
4036 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4037 assert_return(bus, -EINVAL);
4038 assert_return(bus = bus_resolve(bus), -ENOPKG);
4039 assert_return(!bus_pid_changed(bus), -ECHILD);
4041 return bus->trusted;
4044 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4045 assert_return(bus, -EINVAL);
4046 assert_return(bus = bus_resolve(bus), -ENOPKG);
4047 assert_return(!bus_pid_changed(bus), -ECHILD);
4049 return bus->is_monitor;
4052 static void flush_close(sd_bus *bus) {
4056 /* Flushes and closes the specified bus. We take a ref before,
4057 * to ensure the flushing does not cause the bus to be
4060 sd_bus_flush_close_unref(sd_bus_ref(bus));
4063 _public_ void sd_bus_default_flush_close(void) {
4064 flush_close(default_starter_bus);
4065 #if 0 /// elogind does not support user buses
4066 flush_close(default_user_bus);
4068 flush_close(default_system_bus);
4071 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4072 assert_return(bus, -EINVAL);
4073 assert_return(bus = bus_resolve(bus), -ENOPKG);
4075 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4076 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4077 * from the client side. */
4078 bus->exit_on_disconnect = b;
4080 /* If the exit condition was triggered already, exit immediately. */
4081 return bus_exit_now(bus);
4084 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4085 assert_return(bus, -EINVAL);
4086 assert_return(bus = bus_resolve(bus), -ENOPKG);
4088 return bus->exit_on_disconnect;
4091 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4092 assert_return(bus, -EINVAL);
4093 assert_return(bus = bus_resolve(bus), -ENOPKG);
4094 assert_return(!bus->bus_client, -EPERM);
4095 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4097 return free_and_strdup(&bus->patch_sender, sender);
4100 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4101 assert_return(bus, -EINVAL);
4102 assert_return(bus = bus_resolve(bus), -ENOPKG);
4103 assert_return(ret, -EINVAL);
4105 if (!bus->patch_sender)
4108 *ret = bus->patch_sender;
4112 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4113 assert_return(bus, -EINVAL);
4114 assert_return(bus = bus_resolve(bus), -ENOPKG);
4115 assert_return(!bus_pid_changed(bus), -ECHILD);
4116 assert_return(ret, -EINVAL);
4118 *ret = bus->rqueue_size;
4122 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4123 assert_return(bus, -EINVAL);
4124 assert_return(bus = bus_resolve(bus), -ENOPKG);
4125 assert_return(!bus_pid_changed(bus), -ECHILD);
4126 assert_return(ret, -EINVAL);
4128 *ret = bus->wqueue_size;