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 sd_bus* 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 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, bus_free);
239 _public_ int sd_bus_new(sd_bus **ret) {
240 _cleanup_free_ sd_bus *b = NULL;
242 assert_return(ret, -EINVAL);
248 b->n_ref = REFCNT_INIT;
249 b->input_fd = b->output_fd = -1;
251 b->message_version = 1;
252 b->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
254 b->original_pid = getpid_cached();
255 b->n_groups = (size_t) -1;
257 assert_se(pthread_mutex_init(&b->memfd_cache_mutex, NULL) == 0);
259 /* We guarantee that wqueue always has space for at least one entry */
260 if (!GREEDY_REALLOC(b->wqueue, b->wqueue_allocated, 1))
267 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
270 assert_return(bus, -EINVAL);
271 assert_return(bus = bus_resolve(bus), -ENOPKG);
272 assert_return(bus->state == BUS_UNSET, -EPERM);
273 assert_return(address, -EINVAL);
274 assert_return(!bus_pid_changed(bus), -ECHILD);
280 return free_and_replace(bus->address, a);
283 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
284 assert_return(bus, -EINVAL);
285 assert_return(bus = bus_resolve(bus), -ENOPKG);
286 assert_return(bus->state == BUS_UNSET, -EPERM);
287 assert_return(input_fd >= 0, -EBADF);
288 assert_return(output_fd >= 0, -EBADF);
289 assert_return(!bus_pid_changed(bus), -ECHILD);
291 bus->input_fd = input_fd;
292 bus->output_fd = output_fd;
296 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
297 _cleanup_free_ char *p = NULL;
300 assert_return(bus, -EINVAL);
301 assert_return(bus = bus_resolve(bus), -ENOPKG);
302 assert_return(bus->state == BUS_UNSET, -EPERM);
303 assert_return(path, -EINVAL);
304 assert_return(!strv_isempty(argv), -EINVAL);
305 assert_return(!bus_pid_changed(bus), -ECHILD);
315 free_and_replace(bus->exec_path, p);
316 strv_free_and_replace(bus->exec_argv, a);
320 _public_ int sd_bus_set_bus_client(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->patch_sender, -EPERM);
325 assert_return(!bus_pid_changed(bus), -ECHILD);
327 bus->bus_client = !!b;
331 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
332 assert_return(bus, -EINVAL);
333 assert_return(bus = bus_resolve(bus), -ENOPKG);
334 assert_return(bus->state == BUS_UNSET, -EPERM);
335 assert_return(!bus_pid_changed(bus), -ECHILD);
337 bus->is_monitor = !!b;
341 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
342 assert_return(bus, -EINVAL);
343 assert_return(bus = bus_resolve(bus), -ENOPKG);
344 assert_return(bus->state == BUS_UNSET, -EPERM);
345 assert_return(!bus_pid_changed(bus), -ECHILD);
347 bus->accept_fd = !!b;
351 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
352 assert_return(bus, -EINVAL);
353 assert_return(bus = bus_resolve(bus), -ENOPKG);
354 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
355 assert_return(!bus_pid_changed(bus), -ECHILD);
357 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
358 * replies, and maybe one day classic D-Bus learns this too */
359 bus->attach_timestamp = !!b;
364 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
365 assert_return(bus, -EINVAL);
366 assert_return(bus = bus_resolve(bus), -ENOPKG);
367 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
368 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
369 assert_return(!bus_pid_changed(bus), -ECHILD);
371 SET_FLAG(bus->creds_mask, mask, b);
373 /* The well knowns we need unconditionally, so that matches can work */
374 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
379 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
380 assert_return(bus, -EINVAL);
381 assert_return(bus = bus_resolve(bus), -ENOPKG);
382 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
383 assert_return(bus->state == BUS_UNSET, -EPERM);
384 assert_return(!bus_pid_changed(bus), -ECHILD);
386 bus->is_server = !!b;
387 bus->server_id = server_id;
391 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
392 assert_return(bus, -EINVAL);
393 assert_return(bus = bus_resolve(bus), -ENOPKG);
394 assert_return(bus->state == BUS_UNSET, -EPERM);
395 assert_return(!bus_pid_changed(bus), -ECHILD);
397 bus->anonymous_auth = !!b;
401 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
402 assert_return(bus, -EINVAL);
403 assert_return(bus = bus_resolve(bus), -ENOPKG);
404 assert_return(bus->state == BUS_UNSET, -EPERM);
405 assert_return(!bus_pid_changed(bus), -ECHILD);
411 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
412 assert_return(bus, -EINVAL);
413 assert_return(bus = bus_resolve(bus), -ENOPKG);
414 assert_return(bus->state == BUS_UNSET, -EPERM);
415 assert_return(!bus_pid_changed(bus), -ECHILD);
417 return free_and_strdup(&bus->description, description);
420 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
421 assert_return(bus, -EINVAL);
422 assert_return(bus = bus_resolve(bus), -ENOPKG);
423 assert_return(!bus_pid_changed(bus), -ECHILD);
425 bus->allow_interactive_authorization = !!b;
429 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
430 assert_return(bus, -EINVAL);
431 assert_return(bus = bus_resolve(bus), -ENOPKG);
432 assert_return(!bus_pid_changed(bus), -ECHILD);
434 return bus->allow_interactive_authorization;
437 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
438 assert_return(bus, -EINVAL);
439 assert_return(bus = bus_resolve(bus), -ENOPKG);
440 assert_return(bus->state == BUS_UNSET, -EPERM);
441 assert_return(!bus_pid_changed(bus), -ECHILD);
443 bus->watch_bind = !!b;
447 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
448 assert_return(bus, -EINVAL);
449 assert_return(bus = bus_resolve(bus), -ENOPKG);
450 assert_return(!bus_pid_changed(bus), -ECHILD);
452 return bus->watch_bind;
455 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
456 assert_return(bus, -EINVAL);
457 assert_return(bus = bus_resolve(bus), -ENOPKG);
458 assert_return(bus->state == BUS_UNSET, -EPERM);
459 assert_return(!bus_pid_changed(bus), -ECHILD);
461 bus->connected_signal = !!b;
465 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
466 assert_return(bus, -EINVAL);
467 assert_return(bus = bus_resolve(bus), -ENOPKG);
468 assert_return(!bus_pid_changed(bus), -ECHILD);
470 return bus->connected_signal;
473 static int synthesize_connected_signal(sd_bus *bus) {
474 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
479 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
480 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
481 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
483 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
484 * that works independently from whether we connected to a full bus or just a direct connection. */
486 if (!bus->connected_signal)
489 r = sd_bus_message_new_signal(
492 "/org/freedesktop/DBus/Local",
493 "org.freedesktop.DBus.Local",
498 bus_message_set_sender_local(bus, m);
500 r = bus_seal_synthetic_message(bus, m);
504 r = bus_rqueue_make_room(bus);
508 /* Insert at the very front */
509 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
510 bus->rqueue[0] = TAKE_PTR(m);
516 void bus_set_state(sd_bus *bus, enum bus_state state) {
518 static const char * const table[_BUS_STATE_MAX] = {
519 [BUS_UNSET] = "UNSET",
520 [BUS_WATCH_BIND] = "WATCH_BIND",
521 [BUS_OPENING] = "OPENING",
522 [BUS_AUTHENTICATING] = "AUTHENTICATING",
523 [BUS_HELLO] = "HELLO",
524 [BUS_RUNNING] = "RUNNING",
525 [BUS_CLOSING] = "CLOSING",
526 [BUS_CLOSED] = "CLOSED",
530 assert(state < _BUS_STATE_MAX);
532 if (state == bus->state)
535 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
539 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
548 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
550 r = sd_bus_message_get_errno(reply);
554 r = sd_bus_message_read(reply, "s", &s);
558 if (!service_name_is_valid(s) || s[0] != ':')
565 free_and_replace(bus->unique_name, t);
567 if (bus->state == BUS_HELLO) {
568 bus_set_state(bus, BUS_RUNNING);
570 r = synthesize_connected_signal(bus);
578 static int bus_send_hello(sd_bus *bus) {
579 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
584 if (!bus->bus_client)
587 r = sd_bus_message_new_method_call(
590 "org.freedesktop.DBus",
591 "/org/freedesktop/DBus",
592 "org.freedesktop.DBus",
597 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
600 int bus_start_running(sd_bus *bus) {
601 struct reply_callback *c;
607 assert(bus->state < BUS_HELLO);
609 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
610 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
611 * adding a fixed value to all entries should not alter the internal order. */
613 n = now(CLOCK_MONOTONIC);
614 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
615 if (c->timeout_usec == 0)
618 c->timeout_usec = usec_add(n, c->timeout_usec);
621 if (bus->bus_client) {
622 bus_set_state(bus, BUS_HELLO);
626 bus_set_state(bus, BUS_RUNNING);
628 r = synthesize_connected_signal(bus);
635 static int parse_address_key(const char **p, const char *key, char **value) {
636 size_t l, n = 0, allocated = 0;
637 _cleanup_free_ char *r = NULL;
646 if (strncmp(*p, key, l) != 0)
659 while (!IN_SET(*a, ';', ',', 0)) {
673 c = (char) ((x << 4) | y);
680 if (!GREEDY_REALLOC(r, allocated, n + 2))
698 free_and_replace(*value, r);
703 static void skip_address_key(const char **p) {
707 *p += strcspn(*p, ",");
713 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
714 _cleanup_free_ char *path = NULL, *abstract = NULL;
723 while (!IN_SET(**p, 0, ';')) {
724 r = parse_address_key(p, "guid", guid);
730 r = parse_address_key(p, "path", &path);
736 r = parse_address_key(p, "abstract", &abstract);
745 if (!path && !abstract)
748 if (path && abstract)
753 if (l > sizeof(b->sockaddr.un.sun_path))
756 b->sockaddr.un.sun_family = AF_UNIX;
757 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
758 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
759 } else if (abstract) {
760 l = strlen(abstract);
761 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
764 b->sockaddr.un.sun_family = AF_UNIX;
765 b->sockaddr.un.sun_path[0] = 0;
766 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
767 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
775 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
776 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
778 struct addrinfo *result, hints = {
779 .ai_socktype = SOCK_STREAM,
780 .ai_flags = AI_ADDRCONFIG,
788 while (!IN_SET(**p, 0, ';')) {
789 r = parse_address_key(p, "guid", guid);
795 r = parse_address_key(p, "host", &host);
801 r = parse_address_key(p, "port", &port);
807 r = parse_address_key(p, "family", &family);
820 if (streq(family, "ipv4"))
821 hints.ai_family = AF_INET;
822 else if (streq(family, "ipv6"))
823 hints.ai_family = AF_INET6;
828 r = getaddrinfo(host, port, &hints, &result);
832 return -EADDRNOTAVAIL;
834 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
835 b->sockaddr_size = result->ai_addrlen;
837 freeaddrinfo(result);
844 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
846 unsigned n_argv = 0, j;
848 size_t allocated = 0;
856 while (!IN_SET(**p, 0, ';')) {
857 r = parse_address_key(p, "guid", guid);
863 r = parse_address_key(p, "path", &path);
869 if (startswith(*p, "argv")) {
873 ul = strtoul(*p + 4, (char**) p, 10);
874 if (errno > 0 || **p != '=' || ul > 256) {
882 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
890 r = parse_address_key(p, NULL, argv + ul);
905 /* Make sure there are no holes in the array, with the
906 * exception of argv[0] */
907 for (j = 1; j < n_argv; j++)
913 if (argv && argv[0] == NULL) {
914 argv[0] = strdup(path);
929 for (j = 0; j < n_argv; j++)
937 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
938 _cleanup_free_ char *machine = NULL, *pid = NULL;
946 while (!IN_SET(**p, 0, ';')) {
947 r = parse_address_key(p, "guid", guid);
953 r = parse_address_key(p, "machine", &machine);
959 r = parse_address_key(p, "pid", &pid);
968 if (!machine == !pid)
972 if (!machine_name_is_valid(machine))
975 free_and_replace(b->machine, machine);
977 b->machine = mfree(b->machine);
981 r = parse_pid(pid, &b->nspid);
987 b->sockaddr.un.sun_family = AF_UNIX;
988 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
989 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
990 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
996 static void bus_reset_parsed_address(sd_bus *b) {
1000 b->sockaddr_size = 0;
1001 b->exec_argv = strv_free(b->exec_argv);
1002 b->exec_path = mfree(b->exec_path);
1003 b->server_id = SD_ID128_NULL;
1004 b->machine = mfree(b->machine);
1008 static int bus_parse_next_address(sd_bus *b) {
1009 _cleanup_free_ char *guid = NULL;
1017 if (b->address[b->address_index] == 0)
1020 bus_reset_parsed_address(b);
1022 a = b->address + b->address_index;
1031 if (startswith(a, "unix:")) {
1034 r = parse_unix_address(b, &a, &guid);
1039 } else if (startswith(a, "tcp:")) {
1042 r = parse_tcp_address(b, &a, &guid);
1048 } else if (startswith(a, "unixexec:")) {
1051 r = parse_exec_address(b, &a, &guid);
1057 } else if (startswith(a, "x-machine-unix:")) {
1060 r = parse_container_unix_address(b, &a, &guid);
1073 r = sd_id128_from_string(guid, &b->server_id);
1078 b->address_index = a - b->address;
1082 static void bus_kill_exec(sd_bus *bus) {
1083 if (pid_is_valid(bus->busexec_pid) > 0) {
1084 sigterm_wait(bus->busexec_pid);
1085 bus->busexec_pid = 0;
1089 static int bus_start_address(sd_bus *b) {
1095 bus_close_io_fds(b);
1096 bus_close_inotify_fd(b);
1100 /* If you provide multiple different bus-addresses, we
1101 * try all of them in order and use the first one that
1105 r = bus_socket_exec(b);
1106 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1107 r = bus_container_connect_socket(b);
1108 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1109 r = bus_socket_connect(b);
1116 q = bus_attach_io_events(b);
1120 q = bus_attach_inotify_event(b);
1127 b->last_connect_error = -r;
1130 r = bus_parse_next_address(b);
1134 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1138 int bus_next_address(sd_bus *b) {
1141 bus_reset_parsed_address(b);
1142 return bus_start_address(b);
1145 static int bus_start_fd(sd_bus *b) {
1150 assert(b->input_fd >= 0);
1151 assert(b->output_fd >= 0);
1153 r = fd_nonblock(b->input_fd, true);
1157 r = fd_cloexec(b->input_fd, true);
1161 if (b->input_fd != b->output_fd) {
1162 r = fd_nonblock(b->output_fd, true);
1166 r = fd_cloexec(b->output_fd, true);
1171 if (fstat(b->input_fd, &st) < 0)
1174 return bus_socket_take_fd(b);
1177 _public_ int sd_bus_start(sd_bus *bus) {
1180 assert_return(bus, -EINVAL);
1181 assert_return(bus = bus_resolve(bus), -ENOPKG);
1182 assert_return(bus->state == BUS_UNSET, -EPERM);
1183 assert_return(!bus_pid_changed(bus), -ECHILD);
1185 bus_set_state(bus, BUS_OPENING);
1187 if (bus->is_server && bus->bus_client)
1190 if (bus->input_fd >= 0)
1191 r = bus_start_fd(bus);
1192 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1193 r = bus_start_address(bus);
1202 return bus_send_hello(bus);
1205 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1207 _cleanup_(bus_freep) sd_bus *b = NULL;
1210 assert_return(ret, -EINVAL);
1212 /* Let's connect to the starter bus if it is set, and
1213 * otherwise to the bus that is appropropriate for the scope
1214 * we are running in */
1216 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1218 if (streq(e, "system"))
1219 return sd_bus_open_system_with_description(ret, description);
1220 #if 0 /// elogind does not support systemd user instances
1221 else if (STR_IN_SET(e, "session", "user"))
1223 return sd_bus_open_user_with_description(ret, description);
1226 e = secure_getenv("DBUS_STARTER_ADDRESS");
1228 #if 0 /// elogind does not support systemd user instances
1229 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1230 return sd_bus_open_user_with_description(ret, description);
1233 return sd_bus_open_system_with_description(ret, description);
1240 r = sd_bus_set_address(b, e);
1244 b->bus_client = true;
1246 /* We don't know whether the bus is trusted or not, so better
1247 * be safe, and authenticate everything */
1249 b->is_local = false;
1250 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1252 r = sd_bus_start(b);
1260 _public_ int sd_bus_open(sd_bus **ret) {
1261 return sd_bus_open_with_description(ret, NULL);
1264 int bus_set_address_system(sd_bus *b) {
1268 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1270 return sd_bus_set_address(b, e);
1272 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1275 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1276 _cleanup_(bus_freep) sd_bus *b = NULL;
1279 assert_return(ret, -EINVAL);
1286 r = sd_bus_set_description(b, description);
1291 r = bus_set_address_system(b);
1295 b->bus_client = true;
1296 b->is_system = true;
1298 /* Let's do per-method access control on the system bus. We
1299 * need the caller's UID and capability set for that. */
1301 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1304 r = sd_bus_start(b);
1312 _public_ int sd_bus_open_system(sd_bus **ret) {
1313 return sd_bus_open_system_with_description(ret, NULL);
1316 #if 0 /// elogind can not open/use a user bus
1317 int bus_set_address_user(sd_bus *b) {
1319 _cleanup_free_ char *ee = NULL, *s = NULL;
1323 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1325 return sd_bus_set_address(b, e);
1327 e = secure_getenv("XDG_RUNTIME_DIR");
1331 ee = bus_address_escape(e);
1335 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1338 b->address = TAKE_PTR(s);
1344 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1345 #if 0 /// elogind does not support user buses
1346 _cleanup_(bus_freep) sd_bus *b = NULL;
1349 assert_return(ret, -EINVAL);
1356 r = sd_bus_set_description(b, description);
1361 r = bus_set_address_user(b);
1365 b->bus_client = true;
1368 /* We don't do any per-method access control on the user
1373 r = sd_bus_start(b);
1381 _public_ int sd_bus_open_user(sd_bus **ret) {
1382 return sd_bus_open_user_with_description(ret, NULL);
1384 return sd_bus_open_system(ret);
1388 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1389 _cleanup_free_ char *e = NULL;
1390 char *m = NULL, *c = NULL, *a;
1395 /* Let's see if we shall enter some container */
1396 m = strchr(host, ':');
1400 /* Let's make sure this is not a port of some kind,
1401 * and is a valid machine name. */
1402 if (!in_charset(m, DIGITS) && machine_name_is_valid(m)) {
1405 /* Cut out the host part */
1406 t = strndupa(host, m - host - 1);
1407 e = bus_address_escape(t);
1411 c = strjoina(",argv5=--machine=", m);
1416 e = bus_address_escape(host);
1421 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=elogind-stdio-bridge", c);
1425 return free_and_replace(b->address, a);
1428 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1429 _cleanup_(bus_freep) sd_bus *b = NULL;
1432 assert_return(host, -EINVAL);
1433 assert_return(ret, -EINVAL);
1439 r = bus_set_address_system_remote(b, host);
1443 b->bus_client = true;
1445 b->is_system = true;
1446 b->is_local = false;
1448 r = sd_bus_start(b);
1456 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1457 _cleanup_free_ char *e = NULL;
1463 e = bus_address_escape(machine);
1467 a = strjoin("x-machine-unix:machine=", e);
1471 return free_and_replace(b->address, a);
1474 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1475 _cleanup_(bus_freep) sd_bus *b = NULL;
1478 assert_return(machine, -EINVAL);
1479 assert_return(ret, -EINVAL);
1480 assert_return(machine_name_is_valid(machine), -EINVAL);
1486 r = bus_set_address_system_machine(b, machine);
1490 b->bus_client = true;
1492 b->is_system = true;
1493 b->is_local = false;
1495 r = sd_bus_start(b);
1503 _public_ void sd_bus_close(sd_bus *bus) {
1506 if (bus->state == BUS_CLOSED)
1508 if (bus_pid_changed(bus))
1511 /* Don't leave ssh hanging around */
1514 bus_set_state(bus, BUS_CLOSED);
1516 sd_bus_detach_event(bus);
1518 /* Drop all queued messages so that they drop references to
1519 * the bus object and the bus may be freed */
1520 bus_reset_queues(bus);
1522 bus_close_io_fds(bus);
1523 bus_close_inotify_fd(bus);
1526 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1530 /* Have to do this before flush() to prevent hang */
1536 return sd_bus_unref(bus);
1539 void bus_enter_closing(sd_bus *bus) {
1542 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1545 bus_set_state(bus, BUS_CLOSING);
1548 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1552 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1557 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1563 i = REFCNT_DEC(bus->n_ref);
1567 return bus_free(bus);
1570 _public_ int sd_bus_is_open(sd_bus *bus) {
1571 assert_return(bus, -EINVAL);
1572 assert_return(bus = bus_resolve(bus), -ENOPKG);
1573 assert_return(!bus_pid_changed(bus), -ECHILD);
1575 return BUS_IS_OPEN(bus->state);
1578 _public_ int sd_bus_is_ready(sd_bus *bus) {
1579 assert_return(bus, -EINVAL);
1580 assert_return(bus = bus_resolve(bus), -ENOPKG);
1581 assert_return(!bus_pid_changed(bus), -ECHILD);
1583 return bus->state == BUS_RUNNING;
1586 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1589 assert_return(bus, -EINVAL);
1590 assert_return(bus = bus_resolve(bus), -ENOPKG);
1591 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1592 assert_return(!bus_pid_changed(bus), -ECHILD);
1594 if (bus->is_monitor)
1597 if (type == SD_BUS_TYPE_UNIX_FD) {
1598 if (!bus->accept_fd)
1601 r = bus_ensure_running(bus);
1605 return bus->can_fds;
1608 return bus_type_is_valid(type);
1611 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1614 assert_return(bus, -EINVAL);
1615 assert_return(bus = bus_resolve(bus), -ENOPKG);
1616 assert_return(id, -EINVAL);
1617 assert_return(!bus_pid_changed(bus), -ECHILD);
1619 r = bus_ensure_running(bus);
1623 *id = bus->server_id;
1627 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1634 /* If we copy the same message to multiple
1635 * destinations, avoid using the same cookie
1637 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1642 timeout = BUS_DEFAULT_TIMEOUT;
1644 if (!m->sender && b->patch_sender) {
1645 r = sd_bus_message_set_sender(m, b->patch_sender);
1650 return sd_bus_message_seal(m, ++b->cookie, timeout);
1653 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1654 bool remarshal = false;
1658 /* wrong packet version */
1659 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1662 /* wrong packet endianness */
1663 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1666 return remarshal ? bus_message_remarshal(b, m) : 0;
1669 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1673 /* Fake some timestamps, if they were requested, and not
1674 * already initialized */
1675 if (b->attach_timestamp) {
1676 if (m->realtime <= 0)
1677 m->realtime = now(CLOCK_REALTIME);
1679 if (m->monotonic <= 0)
1680 m->monotonic = now(CLOCK_MONOTONIC);
1683 /* The bus specification says the serial number cannot be 0,
1684 * hence let's fill something in for synthetic messages. Since
1685 * synthetic messages might have a fake sender and we don't
1686 * want to interfere with the real sender's serial numbers we
1687 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1688 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1689 * even though kdbus can do 64bit. */
1690 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1693 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1699 r = bus_socket_write_message(bus, m, idx);
1703 if (*idx >= BUS_MESSAGE_SIZE(m))
1704 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",
1705 bus_message_type_to_string(m->header->type),
1706 strna(sd_bus_message_get_sender(m)),
1707 strna(sd_bus_message_get_destination(m)),
1708 strna(sd_bus_message_get_path(m)),
1709 strna(sd_bus_message_get_interface(m)),
1710 strna(sd_bus_message_get_member(m)),
1711 BUS_MESSAGE_COOKIE(m),
1713 strna(m->root_container.signature),
1714 strna(m->error.name),
1715 strna(m->error.message));
1720 static int dispatch_wqueue(sd_bus *bus) {
1724 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1726 while (bus->wqueue_size > 0) {
1728 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1732 /* Didn't do anything this time */
1734 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1735 /* Fully written. Let's drop the entry from
1738 * This isn't particularly optimized, but
1739 * well, this is supposed to be our worst-case
1740 * buffer only, and the socket buffer is
1741 * supposed to be our primary buffer, and if
1742 * it got full, then all bets are off
1746 sd_bus_message_unref(bus->wqueue[0]);
1747 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1757 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1760 return bus_socket_read_message(bus);
1763 int bus_rqueue_make_room(sd_bus *bus) {
1766 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1769 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1775 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1780 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1782 /* Note that the priority logic is only available on kdbus,
1783 * where the rqueue is unused. We check the rqueue here
1784 * anyway, because it's simple... */
1787 if (bus->rqueue_size > 0) {
1788 /* Dispatch a queued message */
1790 *m = bus->rqueue[0];
1792 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1796 /* Try to read a new message */
1797 r = bus_read_message(bus, hint_priority, priority);
1807 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1808 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1811 assert_return(m, -EINVAL);
1816 assert_return(!bus_pid_changed(bus), -ECHILD);
1818 if (!BUS_IS_OPEN(bus->state))
1822 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1829 /* If the cookie number isn't kept, then we know that no reply
1831 if (!cookie && !m->sealed)
1832 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1834 r = bus_seal_message(bus, m, 0);
1838 /* Remarshall if we have to. This will possibly unref the
1839 * message and place a replacement in m */
1840 r = bus_remarshal_message(bus, &m);
1844 /* If this is a reply and no reply was requested, then let's
1845 * suppress this, if we can */
1849 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1852 r = bus_write_message(bus, m, &idx);
1854 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1855 bus_enter_closing(bus);
1862 if (idx < BUS_MESSAGE_SIZE(m)) {
1863 /* Wasn't fully written. So let's remember how
1864 * much was written. Note that the first entry
1865 * of the wqueue array is always allocated so
1866 * that we always can remember how much was
1868 bus->wqueue[0] = sd_bus_message_ref(m);
1869 bus->wqueue_size = 1;
1874 /* Just append it to the queue. */
1876 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1879 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1882 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1887 *cookie = BUS_MESSAGE_COOKIE(m);
1892 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1895 assert_return(m, -EINVAL);
1900 assert_return(!bus_pid_changed(bus), -ECHILD);
1902 if (!BUS_IS_OPEN(bus->state))
1905 if (!streq_ptr(m->destination, destination)) {
1910 r = sd_bus_message_set_destination(m, destination);
1915 return sd_bus_send(bus, m, cookie);
1918 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1921 if (usec == (uint64_t) -1)
1924 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1925 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1926 * relative timestamp, and afterwards the absolute one. */
1928 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1931 return now(CLOCK_MONOTONIC) + usec;
1934 static int timeout_compare(const void *a, const void *b) {
1935 const struct reply_callback *x = a, *y = b;
1937 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1940 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1943 if (x->timeout_usec < y->timeout_usec)
1946 if (x->timeout_usec > y->timeout_usec)
1952 _public_ int sd_bus_call_async(
1956 sd_bus_message_handler_t callback,
1960 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1961 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1964 assert_return(m, -EINVAL);
1965 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1966 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
1971 assert_return(!bus_pid_changed(bus), -ECHILD);
1973 if (!BUS_IS_OPEN(bus->state))
1976 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
1977 if (!callback && !slot && !m->sealed)
1978 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1980 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1984 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1988 r = bus_seal_message(bus, m, usec);
1992 r = bus_remarshal_message(bus, &m);
1996 if (slot || callback) {
1997 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2001 s->reply_callback.callback = callback;
2003 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2004 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2006 s->reply_callback.cookie = 0;
2010 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2011 if (s->reply_callback.timeout_usec != 0) {
2012 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2014 s->reply_callback.timeout_usec = 0;
2020 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2031 int bus_ensure_running(sd_bus *bus) {
2036 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2038 if (bus->state == BUS_RUNNING)
2042 r = sd_bus_process(bus, NULL);
2045 if (bus->state == BUS_RUNNING)
2050 r = sd_bus_wait(bus, (uint64_t) -1);
2056 _public_ int sd_bus_call(
2060 sd_bus_error *error,
2061 sd_bus_message **reply) {
2063 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2069 bus_assert_return(m, -EINVAL, error);
2070 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2071 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2072 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2077 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2079 if (!BUS_IS_OPEN(bus->state)) {
2084 r = bus_ensure_running(bus);
2088 i = bus->rqueue_size;
2090 r = bus_seal_message(bus, m, usec);
2094 r = bus_remarshal_message(bus, &m);
2098 r = sd_bus_send(bus, m, &cookie);
2102 timeout = calc_elapse(bus, m->timeout);
2107 while (i < bus->rqueue_size) {
2108 sd_bus_message *incoming = NULL;
2110 incoming = bus->rqueue[i];
2112 if (incoming->reply_cookie == cookie) {
2113 /* Found a match! */
2115 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2117 log_debug_bus_message(incoming);
2119 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2121 if (incoming->n_fds <= 0 || bus->accept_fd) {
2125 sd_bus_message_unref(incoming);
2130 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2131 sd_bus_message_unref(incoming);
2134 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2135 r = sd_bus_error_copy(error, &incoming->error);
2136 sd_bus_message_unref(incoming);
2143 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2146 streq(bus->unique_name, incoming->sender)) {
2148 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2151 /* Our own message? Somebody is trying
2152 * to send its own client a message,
2153 * let's not dead-lock, let's fail
2156 sd_bus_message_unref(incoming);
2161 /* Try to read more, right-away */
2165 r = bus_read_message(bus, false, 0);
2167 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2168 bus_enter_closing(bus);
2180 n = now(CLOCK_MONOTONIC);
2188 left = (uint64_t) -1;
2190 r = bus_poll(bus, true, left);
2198 r = dispatch_wqueue(bus);
2200 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2201 bus_enter_closing(bus);
2210 return sd_bus_error_set_errno(error, r);
2213 _public_ int sd_bus_get_fd(sd_bus *bus) {
2215 assert_return(bus, -EINVAL);
2216 assert_return(bus = bus_resolve(bus), -ENOPKG);
2217 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2218 assert_return(!bus_pid_changed(bus), -ECHILD);
2220 if (bus->state == BUS_CLOSED)
2223 if (bus->inotify_fd >= 0)
2224 return bus->inotify_fd;
2226 if (bus->input_fd >= 0)
2227 return bus->input_fd;
2232 _public_ int sd_bus_get_events(sd_bus *bus) {
2235 assert_return(bus, -EINVAL);
2236 assert_return(bus = bus_resolve(bus), -ENOPKG);
2237 assert_return(!bus_pid_changed(bus), -ECHILD);
2239 switch (bus->state) {
2245 case BUS_WATCH_BIND:
2253 case BUS_AUTHENTICATING:
2254 if (bus_socket_auth_needs_write(bus))
2262 if (bus->rqueue_size <= 0)
2264 if (bus->wqueue_size > 0)
2272 assert_not_reached("Unknown state");
2278 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2279 struct reply_callback *c;
2281 assert_return(bus, -EINVAL);
2282 assert_return(bus = bus_resolve(bus), -ENOPKG);
2283 assert_return(timeout_usec, -EINVAL);
2284 assert_return(!bus_pid_changed(bus), -ECHILD);
2286 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2289 if (bus->track_queue) {
2294 switch (bus->state) {
2296 case BUS_AUTHENTICATING:
2297 *timeout_usec = bus->auth_timeout;
2302 if (bus->rqueue_size > 0) {
2307 c = prioq_peek(bus->reply_callbacks_prioq);
2309 *timeout_usec = (uint64_t) -1;
2313 if (c->timeout_usec == 0) {
2314 *timeout_usec = (uint64_t) -1;
2318 *timeout_usec = c->timeout_usec;
2325 case BUS_WATCH_BIND:
2327 *timeout_usec = (uint64_t) -1;
2331 assert_not_reached("Unknown or unexpected stat");
2335 static int process_timeout(sd_bus *bus) {
2336 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2337 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2338 struct reply_callback *c;
2345 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2347 c = prioq_peek(bus->reply_callbacks_prioq);
2351 n = now(CLOCK_MONOTONIC);
2352 if (c->timeout_usec > n)
2355 r = bus_message_new_synthetic_error(
2358 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2363 r = bus_seal_synthetic_message(bus, m);
2367 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2368 c->timeout_usec = 0;
2370 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2373 slot = container_of(c, sd_bus_slot, reply_callback);
2375 bus->iteration_counter++;
2377 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2379 bus->current_message = m;
2380 bus->current_slot = sd_bus_slot_ref(slot);
2381 bus->current_handler = c->callback;
2382 bus->current_userdata = slot->userdata;
2383 r = c->callback(m, slot->userdata, &error_buffer);
2384 bus->current_userdata = NULL;
2385 bus->current_handler = NULL;
2386 bus->current_slot = NULL;
2387 bus->current_message = NULL;
2389 if (slot->floating) {
2390 bus_slot_disconnect(slot);
2391 sd_bus_slot_unref(slot);
2394 sd_bus_slot_unref(slot);
2396 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2397 * and ignore the callback handler's return value. */
2401 return bus_maybe_reply_error(m, r, &error_buffer);
2404 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2408 if (bus->state != BUS_HELLO)
2411 /* Let's make sure the first message on the bus is the HELLO
2412 * reply. But note that we don't actually parse the message
2413 * here (we leave that to the usual handling), we just verify
2414 * we don't let any earlier msg through. */
2416 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2419 if (m->reply_cookie != 1)
2425 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2426 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2427 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2428 struct reply_callback *c;
2436 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2439 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2442 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2448 slot = container_of(c, sd_bus_slot, reply_callback);
2450 if (m->n_fds > 0 && !bus->accept_fd) {
2452 /* If the reply contained a file descriptor which we
2453 * didn't want we pass an error instead. */
2455 r = bus_message_new_synthetic_error(
2458 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2463 /* Copy over original timestamp */
2464 synthetic_reply->realtime = m->realtime;
2465 synthetic_reply->monotonic = m->monotonic;
2466 synthetic_reply->seqnum = m->seqnum;
2468 r = bus_seal_synthetic_message(bus, synthetic_reply);
2472 m = synthetic_reply;
2474 r = sd_bus_message_rewind(m, true);
2479 if (c->timeout_usec != 0) {
2480 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2481 c->timeout_usec = 0;
2484 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2486 bus->current_slot = sd_bus_slot_ref(slot);
2487 bus->current_handler = c->callback;
2488 bus->current_userdata = slot->userdata;
2489 r = c->callback(m, slot->userdata, &error_buffer);
2490 bus->current_userdata = NULL;
2491 bus->current_handler = NULL;
2492 bus->current_slot = NULL;
2494 if (slot->floating) {
2495 bus_slot_disconnect(slot);
2496 sd_bus_slot_unref(slot);
2499 sd_bus_slot_unref(slot);
2501 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2502 * ignore the callback handler's return value. */
2506 return bus_maybe_reply_error(m, r, &error_buffer);
2509 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2510 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2511 struct filter_callback *l;
2518 bus->filter_callbacks_modified = false;
2520 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2523 if (bus->filter_callbacks_modified)
2526 /* Don't run this more than once per iteration */
2527 if (l->last_iteration == bus->iteration_counter)
2530 l->last_iteration = bus->iteration_counter;
2532 r = sd_bus_message_rewind(m, true);
2536 slot = container_of(l, sd_bus_slot, filter_callback);
2538 bus->current_slot = sd_bus_slot_ref(slot);
2539 bus->current_handler = l->callback;
2540 bus->current_userdata = slot->userdata;
2541 r = l->callback(m, slot->userdata, &error_buffer);
2542 bus->current_userdata = NULL;
2543 bus->current_handler = NULL;
2544 bus->current_slot = sd_bus_slot_unref(slot);
2546 r = bus_maybe_reply_error(m, r, &error_buffer);
2552 } while (bus->filter_callbacks_modified);
2557 static int process_match(sd_bus *bus, sd_bus_message *m) {
2564 bus->match_callbacks_modified = false;
2566 r = bus_match_run(bus, &bus->match_callbacks, m);
2570 } while (bus->match_callbacks_modified);
2575 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2576 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2582 if (bus->is_monitor)
2585 if (bus->manual_peer_interface)
2588 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2591 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2594 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2597 if (streq_ptr(m->member, "Ping"))
2598 r = sd_bus_message_new_method_return(m, &reply);
2599 else if (streq_ptr(m->member, "GetMachineId")) {
2603 r = sd_id128_get_machine(&id);
2607 r = sd_bus_message_new_method_return(m, &reply);
2611 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2613 r = sd_bus_message_new_method_errorf(
2615 SD_BUS_ERROR_UNKNOWN_METHOD,
2616 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2622 r = sd_bus_send(bus, reply, NULL);
2629 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2633 /* If we got a message with a file descriptor which we didn't
2634 * want to accept, then let's drop it. How can this even
2635 * happen? For example, when the kernel queues a message into
2636 * an activatable names's queue which allows fds, and then is
2637 * delivered to us later even though we ourselves did not
2640 if (bus->is_monitor)
2649 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2650 return 1; /* just eat it up */
2652 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2655 static int process_message(sd_bus *bus, sd_bus_message *m) {
2661 bus->current_message = m;
2662 bus->iteration_counter++;
2664 log_debug_bus_message(m);
2666 r = process_hello(bus, m);
2670 r = process_reply(bus, m);
2674 r = process_fd_check(bus, m);
2678 r = process_filter(bus, m);
2682 r = process_match(bus, m);
2686 r = process_builtin(bus, m);
2690 r = bus_process_object(bus, m);
2693 bus->current_message = NULL;
2697 static int dispatch_track(sd_bus *bus) {
2700 if (!bus->track_queue)
2703 bus_track_dispatch(bus->track_queue);
2707 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2708 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2712 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2714 r = process_timeout(bus);
2718 r = dispatch_wqueue(bus);
2722 r = dispatch_track(bus);
2726 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2732 r = process_message(bus, m);
2737 r = sd_bus_message_rewind(m, true);
2746 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2748 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2749 strna(sd_bus_message_get_sender(m)),
2750 strna(sd_bus_message_get_path(m)),
2751 strna(sd_bus_message_get_interface(m)),
2752 strna(sd_bus_message_get_member(m)));
2754 r = sd_bus_reply_method_errorf(
2756 SD_BUS_ERROR_UNKNOWN_OBJECT,
2757 "Unknown object '%s'.", m->path);
2771 static int bus_exit_now(sd_bus *bus) {
2774 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2775 * sd_event_exit(), otherwise invokes libc exit(). */
2777 if (bus->exited) /* did we already exit? */
2779 if (!bus->exit_triggered) /* was the exit condition triggered? */
2781 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2784 bus->exited = true; /* never exit more than once */
2786 log_debug("Bus connection disconnected, exiting.");
2789 return sd_event_exit(bus->event, EXIT_FAILURE);
2793 assert_not_reached("exit() didn't exit?");
2796 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2797 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2798 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2805 r = bus_message_new_synthetic_error(
2808 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2813 r = bus_seal_synthetic_message(bus, m);
2817 if (c->timeout_usec != 0) {
2818 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2819 c->timeout_usec = 0;
2822 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2825 slot = container_of(c, sd_bus_slot, reply_callback);
2827 bus->iteration_counter++;
2829 bus->current_message = m;
2830 bus->current_slot = sd_bus_slot_ref(slot);
2831 bus->current_handler = c->callback;
2832 bus->current_userdata = slot->userdata;
2833 r = c->callback(m, slot->userdata, &error_buffer);
2834 bus->current_userdata = NULL;
2835 bus->current_handler = NULL;
2836 bus->current_slot = NULL;
2837 bus->current_message = NULL;
2839 if (slot->floating) {
2840 bus_slot_disconnect(slot);
2841 sd_bus_slot_unref(slot);
2844 sd_bus_slot_unref(slot);
2846 return bus_maybe_reply_error(m, r, &error_buffer);
2849 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2850 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2851 struct reply_callback *c;
2855 assert(bus->state == BUS_CLOSING);
2857 /* First, fail all outstanding method calls */
2858 c = ordered_hashmap_first(bus->reply_callbacks);
2860 return process_closing_reply_callback(bus, c);
2862 /* Then, fake-drop all remaining bus tracking references */
2864 bus_track_close(bus->tracks);
2868 /* Then, synthesize a Disconnected message */
2869 r = sd_bus_message_new_signal(
2872 "/org/freedesktop/DBus/Local",
2873 "org.freedesktop.DBus.Local",
2878 bus_message_set_sender_local(bus, m);
2880 r = bus_seal_synthetic_message(bus, m);
2886 bus->current_message = m;
2887 bus->iteration_counter++;
2889 r = process_filter(bus, m);
2893 r = process_match(bus, m);
2897 /* Nothing else to do, exit now, if the condition holds */
2898 bus->exit_triggered = true;
2899 (void) bus_exit_now(bus);
2907 bus->current_message = NULL;
2912 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2913 BUS_DONT_DESTROY(bus);
2916 /* Returns 0 when we didn't do anything. This should cause the
2917 * caller to invoke sd_bus_wait() before returning the next
2918 * time. Returns > 0 when we did something, which possibly
2919 * means *ret is filled in with an unprocessed message. */
2921 assert_return(bus, -EINVAL);
2922 assert_return(bus = bus_resolve(bus), -ENOPKG);
2923 assert_return(!bus_pid_changed(bus), -ECHILD);
2925 /* We don't allow recursively invoking sd_bus_process(). */
2926 assert_return(!bus->current_message, -EBUSY);
2927 assert(!bus->current_slot);
2929 switch (bus->state) {
2937 case BUS_WATCH_BIND:
2938 r = bus_socket_process_watch_bind(bus);
2942 r = bus_socket_process_opening(bus);
2945 case BUS_AUTHENTICATING:
2946 r = bus_socket_process_authenticating(bus);
2951 r = process_running(bus, hint_priority, priority, ret);
2955 /* This branch initializes *ret, hence we don't use the generic error checking below */
2959 return process_closing(bus, ret);
2962 assert_not_reached("Unknown state");
2965 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2966 bus_enter_closing(bus);
2977 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2978 return bus_process_internal(bus, false, 0, ret);
2981 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2982 return bus_process_internal(bus, true, priority, ret);
2985 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2986 struct pollfd p[2] = {};
2989 usec_t m = USEC_INFINITY;
2993 if (bus->state == BUS_CLOSING)
2996 if (!BUS_IS_OPEN(bus->state))
2999 if (bus->state == BUS_WATCH_BIND) {
3000 assert(bus->inotify_fd >= 0);
3002 p[0].events = POLLIN;
3003 p[0].fd = bus->inotify_fd;
3008 e = sd_bus_get_events(bus);
3013 /* The caller really needs some more data, he doesn't
3014 * care about what's already read, or any timeouts
3015 * except its own. */
3019 /* The caller wants to process if there's something to
3020 * process, but doesn't care otherwise */
3022 r = sd_bus_get_timeout(bus, &until);
3026 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3029 p[0].fd = bus->input_fd;
3030 if (bus->output_fd == bus->input_fd) {
3034 p[0].events = e & POLLIN;
3035 p[1].fd = bus->output_fd;
3036 p[1].events = e & POLLOUT;
3041 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3044 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3048 return r > 0 ? 1 : 0;
3051 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3053 assert_return(bus, -EINVAL);
3054 assert_return(bus = bus_resolve(bus), -ENOPKG);
3055 assert_return(!bus_pid_changed(bus), -ECHILD);
3057 if (bus->state == BUS_CLOSING)
3060 if (!BUS_IS_OPEN(bus->state))
3063 if (bus->rqueue_size > 0)
3066 return bus_poll(bus, false, timeout_usec);
3069 _public_ int sd_bus_flush(sd_bus *bus) {
3072 assert_return(bus, -EINVAL);
3073 assert_return(bus = bus_resolve(bus), -ENOPKG);
3074 assert_return(!bus_pid_changed(bus), -ECHILD);
3076 if (bus->state == BUS_CLOSING)
3079 if (!BUS_IS_OPEN(bus->state))
3082 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3083 if (bus->state == BUS_WATCH_BIND)
3086 r = bus_ensure_running(bus);
3090 if (bus->wqueue_size <= 0)
3094 r = dispatch_wqueue(bus);
3096 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3097 bus_enter_closing(bus);
3104 if (bus->wqueue_size <= 0)
3107 r = bus_poll(bus, false, (uint64_t) -1);
3113 _public_ int sd_bus_add_filter(
3116 sd_bus_message_handler_t callback,
3121 assert_return(bus, -EINVAL);
3122 assert_return(bus = bus_resolve(bus), -ENOPKG);
3123 assert_return(callback, -EINVAL);
3124 assert_return(!bus_pid_changed(bus), -ECHILD);
3126 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3130 s->filter_callback.callback = callback;
3132 bus->filter_callbacks_modified = true;
3133 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3141 static int add_match_callback(
3144 sd_bus_error *ret_error) {
3146 sd_bus_slot *match_slot = userdata;
3147 bool failed = false;
3153 sd_bus_slot_ref(match_slot);
3155 if (sd_bus_message_is_method_error(m, NULL)) {
3156 log_debug_errno(sd_bus_message_get_errno(m),
3157 "Unable to add match %s, failing connection: %s",
3158 match_slot->match_callback.match_string,
3159 sd_bus_message_get_error(m)->message);
3163 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3165 if (match_slot->match_callback.install_callback) {
3168 bus = sd_bus_message_get_bus(m);
3170 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3171 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3174 assert(bus->current_slot == match_slot->match_callback.install_slot);
3175 assert(bus->current_handler == add_match_callback);
3176 assert(bus->current_userdata == userdata);
3178 bus->current_slot = match_slot;
3179 bus->current_handler = match_slot->match_callback.install_callback;
3180 bus->current_userdata = match_slot->userdata;
3182 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3184 bus->current_slot = match_slot->match_callback.install_slot;
3185 bus->current_handler = add_match_callback;
3186 bus->current_userdata = userdata;
3188 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3190 if (failed) /* Generic failure handling: destroy the connection */
3191 bus_enter_closing(sd_bus_message_get_bus(m));
3196 if (failed && match_slot->floating) {
3197 bus_slot_disconnect(match_slot);
3198 sd_bus_slot_unref(match_slot);
3201 sd_bus_slot_unref(match_slot);
3206 static int bus_add_match_full(
3211 sd_bus_message_handler_t callback,
3212 sd_bus_message_handler_t install_callback,
3215 struct bus_match_component *components = NULL;
3216 unsigned n_components = 0;
3217 sd_bus_slot *s = NULL;
3220 assert_return(bus, -EINVAL);
3221 assert_return(bus = bus_resolve(bus), -ENOPKG);
3222 assert_return(match, -EINVAL);
3223 assert_return(!bus_pid_changed(bus), -ECHILD);
3225 r = bus_match_parse(match, &components, &n_components);
3229 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3235 s->match_callback.callback = callback;
3236 s->match_callback.install_callback = install_callback;
3238 if (bus->bus_client) {
3239 enum bus_match_scope scope;
3241 scope = bus_match_get_scope(components, n_components);
3243 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3244 if (scope != BUS_MATCH_LOCAL) {
3246 /* We store the original match string, so that we can use it to remove the match again. */
3248 s->match_callback.match_string = strdup(match);
3249 if (!s->match_callback.match_string) {
3255 r = bus_add_match_internal_async(bus,
3256 &s->match_callback.install_slot,
3257 s->match_callback.match_string,
3261 r = bus_add_match_internal(bus, s->match_callback.match_string);
3265 s->match_added = true;
3269 bus->match_callbacks_modified = true;
3270 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3279 bus_match_parse_free(components, n_components);
3280 sd_bus_slot_unref(s);
3285 #if 0 /// UNNEEDED by elogind
3287 _public_ int sd_bus_add_match(
3291 sd_bus_message_handler_t callback,
3294 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3297 _public_ int sd_bus_add_match_async(
3301 sd_bus_message_handler_t callback,
3302 sd_bus_message_handler_t install_callback,
3305 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3308 bool bus_pid_changed(sd_bus *bus) {
3311 /* We don't support people creating a bus connection and
3312 * keeping it around over a fork(). Let's complain. */
3314 return bus->original_pid != getpid_cached();
3317 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3318 sd_bus *bus = userdata;
3323 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3325 r = sd_bus_process(bus, NULL);
3327 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3328 bus_enter_closing(bus);
3334 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3335 sd_bus *bus = userdata;
3340 r = sd_bus_process(bus, NULL);
3342 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3343 bus_enter_closing(bus);
3349 static int prepare_callback(sd_event_source *s, void *userdata) {
3350 sd_bus *bus = userdata;
3357 e = sd_bus_get_events(bus);
3363 if (bus->output_fd != bus->input_fd) {
3365 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3369 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3371 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3375 r = sd_bus_get_timeout(bus, &until);
3381 j = sd_event_source_set_time(bus->time_event_source, until);
3388 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3395 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3396 bus_enter_closing(bus);
3401 static int quit_callback(sd_event_source *event, void *userdata) {
3402 sd_bus *bus = userdata;
3412 int bus_attach_io_events(sd_bus *bus) {
3417 if (bus->input_fd < 0)
3423 if (!bus->input_io_event_source) {
3424 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3428 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3432 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3436 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3438 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3443 if (bus->output_fd != bus->input_fd) {
3444 assert(bus->output_fd >= 0);
3446 if (!bus->output_io_event_source) {
3447 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3451 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3455 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3457 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3466 static void bus_detach_io_events(sd_bus *bus) {
3469 if (bus->input_io_event_source) {
3470 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3471 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3474 if (bus->output_io_event_source) {
3475 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3476 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3480 int bus_attach_inotify_event(sd_bus *bus) {
3485 if (bus->inotify_fd < 0)
3491 if (!bus->inotify_event_source) {
3492 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3496 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3500 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3502 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3509 static void bus_detach_inotify_event(sd_bus *bus) {
3512 if (bus->inotify_event_source) {
3513 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3514 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3518 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3521 assert_return(bus, -EINVAL);
3522 assert_return(bus = bus_resolve(bus), -ENOPKG);
3523 assert_return(!bus->event, -EBUSY);
3525 assert(!bus->input_io_event_source);
3526 assert(!bus->output_io_event_source);
3527 assert(!bus->time_event_source);
3530 bus->event = sd_event_ref(event);
3532 r = sd_event_default(&bus->event);
3537 bus->event_priority = priority;
3539 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3543 r = sd_event_source_set_priority(bus->time_event_source, priority);
3547 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3551 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3555 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3559 r = bus_attach_io_events(bus);
3563 r = bus_attach_inotify_event(bus);
3570 sd_bus_detach_event(bus);
3574 _public_ int sd_bus_detach_event(sd_bus *bus) {
3575 assert_return(bus, -EINVAL);
3576 assert_return(bus = bus_resolve(bus), -ENOPKG);
3581 bus_detach_io_events(bus);
3582 bus_detach_inotify_event(bus);
3584 if (bus->time_event_source) {
3585 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3586 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3589 if (bus->quit_event_source) {
3590 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3591 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3594 bus->event = sd_event_unref(bus->event);
3598 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3599 assert_return(bus, NULL);
3604 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3605 assert_return(bus, NULL);
3607 return bus->current_message;
3610 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3611 assert_return(bus, NULL);
3613 return bus->current_slot;
3616 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3617 assert_return(bus, NULL);
3619 return bus->current_handler;
3622 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3623 assert_return(bus, NULL);
3625 return bus->current_userdata;
3628 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3633 assert(default_bus);
3636 return !!*default_bus;
3639 *ret = sd_bus_ref(*default_bus);
3647 b->default_bus_ptr = default_bus;
3655 _public_ int sd_bus_default_system(sd_bus **ret) {
3656 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3659 _public_ int sd_bus_default_user(sd_bus **ret) {
3660 #if 0 /// elogind does not support user buses
3661 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3663 return sd_bus_default_system(ret);
3667 _public_ int sd_bus_default(sd_bus **ret) {
3668 int (*bus_open)(sd_bus **) = NULL;
3671 busp = bus_choose_default(&bus_open);
3672 return bus_default(bus_open, busp, ret);
3675 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3676 assert_return(b, -EINVAL);
3677 assert_return(tid, -EINVAL);
3678 assert_return(!bus_pid_changed(b), -ECHILD);
3686 return sd_event_get_tid(b->event, tid);
3691 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3692 _cleanup_free_ char *e = NULL;
3695 assert_return(object_path_is_valid(prefix), -EINVAL);
3696 assert_return(external_id, -EINVAL);
3697 assert_return(ret_path, -EINVAL);
3699 e = bus_label_escape(external_id);
3703 ret = strjoin(prefix, "/", e);
3711 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3715 assert_return(object_path_is_valid(path), -EINVAL);
3716 assert_return(object_path_is_valid(prefix), -EINVAL);
3717 assert_return(external_id, -EINVAL);
3719 e = object_path_startswith(path, prefix);
3721 *external_id = NULL;
3725 ret = bus_label_unescape(e);
3733 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3734 _cleanup_strv_free_ char **labels = NULL;
3735 char *path, *path_pos, **label_pos;
3736 const char *sep, *template_pos;
3741 assert_return(out, -EINVAL);
3742 assert_return(path_template, -EINVAL);
3744 path_length = strlen(path_template);
3746 va_start(list, path_template);
3747 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3751 arg = va_arg(list, const char *);
3757 label = bus_label_escape(arg);
3763 r = strv_consume(&labels, label);
3769 /* add label length, but account for the format character */
3770 path_length += strlen(label) - 1;
3774 path = malloc(path_length + 1);
3781 for (template_pos = path_template; *template_pos; ) {
3782 sep = strchrnul(template_pos, '%');
3783 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3787 path_pos = stpcpy(path_pos, *label_pos++);
3788 template_pos = sep + 1;
3796 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3797 _cleanup_strv_free_ char **labels = NULL;
3798 const char *template_pos, *path_pos;
3804 * This decodes an object-path based on a template argument. The
3805 * template consists of a verbatim path, optionally including special
3808 * - Each occurrence of '%' in the template matches an arbitrary
3809 * substring of a label in the given path. At most one such
3810 * directive is allowed per label. For each such directive, the
3811 * caller must provide an output parameter (char **) via va_arg. If
3812 * NULL is passed, the given label is verified, but not returned.
3813 * For each matched label, the *decoded* label is stored in the
3814 * passed output argument, and the caller is responsible to free
3815 * it. Note that the output arguments are only modified if the
3816 * actualy path matched the template. Otherwise, they're left
3819 * This function returns <0 on error, 0 if the path does not match the
3820 * template, 1 if it matched.
3823 assert_return(path, -EINVAL);
3824 assert_return(path_template, -EINVAL);
3828 for (template_pos = path_template; *template_pos; ) {
3833 /* verify everything until the next '%' matches verbatim */
3834 sep = strchrnul(template_pos, '%');
3835 length = sep - template_pos;
3836 if (strncmp(path_pos, template_pos, length))
3840 template_pos += length;
3845 /* We found the next '%' character. Everything up until here
3846 * matched. We now skip ahead to the end of this label and make
3847 * sure it matches the tail of the label in the path. Then we
3848 * decode the string in-between and save it for later use. */
3850 ++template_pos; /* skip over '%' */
3852 sep = strchrnul(template_pos, '/');
3853 length = sep - template_pos; /* length of suffix to match verbatim */
3855 /* verify the suffixes match */
3856 sep = strchrnul(path_pos, '/');
3857 if (sep - path_pos < (ssize_t)length ||
3858 strncmp(sep - length, template_pos, length))
3861 template_pos += length; /* skip over matched label */
3862 length = sep - path_pos - length; /* length of sub-label to decode */
3864 /* store unescaped label for later use */
3865 label = bus_label_unescape_n(path_pos, length);
3869 r = strv_consume(&labels, label);
3873 path_pos = sep; /* skip decoded label and suffix */
3876 /* end of template must match end of path */
3880 /* copy the labels over to the caller */
3881 va_start(list, path_template);
3882 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3885 arg = va_arg(list, char **);
3893 labels = mfree(labels);
3897 _public_ int sd_bus_try_close(sd_bus *bus) {
3898 assert_return(bus, -EINVAL);
3899 assert_return(bus = bus_resolve(bus), -ENOPKG);
3900 assert_return(!bus_pid_changed(bus), -ECHILD);
3905 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3906 assert_return(bus, -EINVAL);
3907 assert_return(bus = bus_resolve(bus), -ENOPKG);
3908 assert_return(description, -EINVAL);
3909 assert_return(bus->description, -ENXIO);
3910 assert_return(!bus_pid_changed(bus), -ECHILD);
3912 if (bus->description)
3913 *description = bus->description;
3914 else if (bus->is_system)
3915 *description = "system";
3916 else if (bus->is_user)
3917 *description = "user";
3919 *description = NULL;
3924 int bus_get_root_path(sd_bus *bus) {
3927 if (bus->cgroup_root)
3930 r = cg_get_root_path(&bus->cgroup_root);
3932 bus->cgroup_root = strdup("/");
3933 if (!bus->cgroup_root)
3942 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3943 assert_return(bus, -EINVAL);
3944 assert_return(bus = bus_resolve(bus), -ENOPKG);
3945 assert_return(scope, -EINVAL);
3946 assert_return(!bus_pid_changed(bus), -ECHILD);
3953 if (bus->is_system) {
3961 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3963 assert_return(bus, -EINVAL);
3964 assert_return(bus = bus_resolve(bus), -ENOPKG);
3965 assert_return(address, -EINVAL);
3966 assert_return(!bus_pid_changed(bus), -ECHILD);
3969 *address = bus->address;
3976 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3977 assert_return(bus, -EINVAL);
3978 assert_return(bus = bus_resolve(bus), -ENOPKG);
3979 assert_return(mask, -EINVAL);
3980 assert_return(!bus_pid_changed(bus), -ECHILD);
3982 *mask = bus->creds_mask;
3986 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3987 assert_return(bus, -EINVAL);
3988 assert_return(bus = bus_resolve(bus), -ENOPKG);
3989 assert_return(!bus_pid_changed(bus), -ECHILD);
3991 return bus->bus_client;
3994 _public_ int sd_bus_is_server(sd_bus *bus) {
3995 assert_return(bus, -EINVAL);
3996 assert_return(bus = bus_resolve(bus), -ENOPKG);
3997 assert_return(!bus_pid_changed(bus), -ECHILD);
3999 return bus->is_server;
4002 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4003 assert_return(bus, -EINVAL);
4004 assert_return(bus = bus_resolve(bus), -ENOPKG);
4005 assert_return(!bus_pid_changed(bus), -ECHILD);
4007 return bus->anonymous_auth;
4010 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4011 assert_return(bus, -EINVAL);
4012 assert_return(bus = bus_resolve(bus), -ENOPKG);
4013 assert_return(!bus_pid_changed(bus), -ECHILD);
4015 return bus->trusted;
4018 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4019 assert_return(bus, -EINVAL);
4020 assert_return(bus = bus_resolve(bus), -ENOPKG);
4021 assert_return(!bus_pid_changed(bus), -ECHILD);
4023 return bus->is_monitor;
4026 static void flush_close(sd_bus *bus) {
4030 /* Flushes and closes the specified bus. We take a ref before,
4031 * to ensure the flushing does not cause the bus to be
4034 sd_bus_flush_close_unref(sd_bus_ref(bus));
4037 _public_ void sd_bus_default_flush_close(void) {
4038 flush_close(default_starter_bus);
4039 #if 0 /// elogind does not support user buses
4040 flush_close(default_user_bus);
4042 flush_close(default_system_bus);
4045 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4046 assert_return(bus, -EINVAL);
4047 assert_return(bus = bus_resolve(bus), -ENOPKG);
4049 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4050 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4051 * from the client side. */
4052 bus->exit_on_disconnect = b;
4054 /* If the exit condition was triggered already, exit immediately. */
4055 return bus_exit_now(bus);
4058 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4059 assert_return(bus, -EINVAL);
4060 assert_return(bus = bus_resolve(bus), -ENOPKG);
4062 return bus->exit_on_disconnect;
4065 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4066 assert_return(bus, -EINVAL);
4067 assert_return(bus = bus_resolve(bus), -ENOPKG);
4068 assert_return(!bus->bus_client, -EPERM);
4069 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4071 return free_and_strdup(&bus->patch_sender, sender);
4074 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4075 assert_return(bus, -EINVAL);
4076 assert_return(bus = bus_resolve(bus), -ENOPKG);
4077 assert_return(ret, -EINVAL);
4079 if (!bus->patch_sender)
4082 *ret = bus->patch_sender;
4086 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4087 assert_return(bus, -EINVAL);
4088 assert_return(bus = bus_resolve(bus), -ENOPKG);
4089 assert_return(!bus_pid_changed(bus), -ECHILD);
4090 assert_return(ret, -EINVAL);
4092 *ret = bus->rqueue_size;
4096 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4097 assert_return(bus, -EINVAL);
4098 assert_return(bus = bus_resolve(bus), -ENOPKG);
4099 assert_return(!bus_pid_changed(bus), -ECHILD);
4100 assert_return(ret, -EINVAL);
4102 *ret = bus->wqueue_size;