1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2013 Lennart Poettering
15 //#include <sys/wait.h>
20 #include "alloc-util.h"
21 #include "bus-container.h"
22 #include "bus-control.h"
23 #include "bus-internal.h"
24 #include "bus-kernel.h"
25 #include "bus-label.h"
26 #include "bus-message.h"
27 #include "bus-objects.h"
28 #include "bus-protocol.h"
30 #include "bus-socket.h"
31 #include "bus-track.h"
34 #include "cgroup-util.h"
37 #include "hexdecoct.h"
38 #include "hostname-util.h"
41 #include "parse-util.h"
42 //#include "process-util.h"
43 #include "string-util.h"
47 /// Additional includes needed by elogind
48 #include "process-util.h"
50 #define log_debug_bus_message(m) \
52 sd_bus_message *_mm = (m); \
53 log_debug("Got message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s", \
54 bus_message_type_to_string(_mm->header->type), \
55 strna(sd_bus_message_get_sender(_mm)), \
56 strna(sd_bus_message_get_destination(_mm)), \
57 strna(sd_bus_message_get_path(_mm)), \
58 strna(sd_bus_message_get_interface(_mm)), \
59 strna(sd_bus_message_get_member(_mm)), \
60 BUS_MESSAGE_COOKIE(_mm), \
62 strna(_mm->root_container.signature), \
63 strna(_mm->error.name), \
64 strna(_mm->error.message)); \
67 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
68 static void bus_detach_io_events(sd_bus *b);
69 static void bus_detach_inotify_event(sd_bus *b);
71 static thread_local sd_bus *default_system_bus = NULL;
72 static thread_local sd_bus *default_user_bus = NULL;
73 static thread_local sd_bus *default_starter_bus = NULL;
75 static sd_bus **bus_choose_default(int (**bus_open)(sd_bus **)) {
78 /* Let's try our best to reuse another cached connection. If
79 * the starter bus type is set, connect via our normal
80 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
81 * we can share the connection with the user/system default
84 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
86 if (streq(e, "system")) {
88 *bus_open = sd_bus_open_system;
89 return &default_system_bus;
90 } else if (STR_IN_SET(e, "user", "session")) {
92 *bus_open = sd_bus_open_user;
93 return &default_user_bus;
97 /* No type is specified, so we have not other option than to
98 * use the starter address if it is set. */
99 e = secure_getenv("DBUS_STARTER_ADDRESS");
102 *bus_open = sd_bus_open;
103 return &default_starter_bus;
106 /* Finally, if nothing is set use the cached connection for
109 if (cg_pid_get_owner_uid(0, NULL) >= 0) {
111 *bus_open = sd_bus_open_user;
112 return &default_user_bus;
115 *bus_open = sd_bus_open_system;
116 return &default_system_bus;
120 sd_bus *bus_resolve(sd_bus *bus) {
121 switch ((uintptr_t) bus) {
122 case (uintptr_t) SD_BUS_DEFAULT:
123 return *(bus_choose_default(NULL));
124 case (uintptr_t) SD_BUS_DEFAULT_USER:
125 return default_user_bus;
126 case (uintptr_t) SD_BUS_DEFAULT_SYSTEM:
127 return default_system_bus;
133 void bus_close_io_fds(sd_bus *b) {
136 bus_detach_io_events(b);
138 if (b->input_fd != b->output_fd)
139 safe_close(b->output_fd);
140 b->output_fd = b->input_fd = safe_close(b->input_fd);
143 void bus_close_inotify_fd(sd_bus *b) {
146 bus_detach_inotify_event(b);
148 b->inotify_fd = safe_close(b->inotify_fd);
149 b->inotify_watches = mfree(b->inotify_watches);
150 b->n_inotify_watches = 0;
153 static void bus_reset_queues(sd_bus *b) {
156 while (b->rqueue_size > 0)
157 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
159 b->rqueue = mfree(b->rqueue);
160 b->rqueue_allocated = 0;
162 while (b->wqueue_size > 0)
163 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
165 b->wqueue = mfree(b->wqueue);
166 b->wqueue_allocated = 0;
169 static void bus_free(sd_bus *b) {
173 assert(!b->track_queue);
176 b->state = BUS_CLOSED;
178 sd_bus_detach_event(b);
180 while ((s = b->slots)) {
181 /* At this point only floating slots can still be
182 * around, because the non-floating ones keep a
183 * reference to the bus, and we thus couldn't be
184 * destructing right now... We forcibly disconnect the
185 * slots here, so that they still can be referenced by
186 * apps, but are dead. */
189 bus_slot_disconnect(s);
190 sd_bus_slot_unref(s);
193 if (b->default_bus_ptr)
194 *b->default_bus_ptr = NULL;
197 bus_close_inotify_fd(b);
202 free(b->unique_name);
203 free(b->auth_buffer);
206 free(b->cgroup_root);
207 free(b->description);
208 free(b->patch_sender);
211 strv_free(b->exec_argv);
213 close_many(b->fds, b->n_fds);
218 ordered_hashmap_free_free(b->reply_callbacks);
219 prioq_free(b->reply_callbacks_prioq);
221 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
222 bus_match_free(&b->match_callbacks);
224 hashmap_free_free(b->vtable_methods);
225 hashmap_free_free(b->vtable_properties);
227 assert(hashmap_isempty(b->nodes));
228 hashmap_free(b->nodes);
232 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
237 _public_ int sd_bus_new(sd_bus **ret) {
240 assert_return(ret, -EINVAL);
246 r->n_ref = REFCNT_INIT;
247 r->input_fd = r->output_fd = -1;
249 r->message_version = 1;
250 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
252 r->original_pid = getpid_cached();
253 r->n_groups = (size_t) -1;
255 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
257 /* We guarantee that wqueue always has space for at least one
259 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
268 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
271 assert_return(bus, -EINVAL);
272 assert_return(bus = bus_resolve(bus), -ENOPKG);
273 assert_return(bus->state == BUS_UNSET, -EPERM);
274 assert_return(address, -EINVAL);
275 assert_return(!bus_pid_changed(bus), -ECHILD);
281 free_and_replace(bus->address, a);
286 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
287 assert_return(bus, -EINVAL);
288 assert_return(bus = bus_resolve(bus), -ENOPKG);
289 assert_return(bus->state == BUS_UNSET, -EPERM);
290 assert_return(input_fd >= 0, -EBADF);
291 assert_return(output_fd >= 0, -EBADF);
292 assert_return(!bus_pid_changed(bus), -ECHILD);
294 bus->input_fd = input_fd;
295 bus->output_fd = output_fd;
299 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
302 assert_return(bus, -EINVAL);
303 assert_return(bus = bus_resolve(bus), -ENOPKG);
304 assert_return(bus->state == BUS_UNSET, -EPERM);
305 assert_return(path, -EINVAL);
306 assert_return(!strv_isempty(argv), -EINVAL);
307 assert_return(!bus_pid_changed(bus), -ECHILD);
319 free_and_replace(bus->exec_path, p);
321 strv_free(bus->exec_argv);
327 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
328 assert_return(bus, -EINVAL);
329 assert_return(bus = bus_resolve(bus), -ENOPKG);
330 assert_return(bus->state == BUS_UNSET, -EPERM);
331 assert_return(!bus->patch_sender, -EPERM);
332 assert_return(!bus_pid_changed(bus), -ECHILD);
334 bus->bus_client = !!b;
338 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
339 assert_return(bus, -EINVAL);
340 assert_return(bus = bus_resolve(bus), -ENOPKG);
341 assert_return(bus->state == BUS_UNSET, -EPERM);
342 assert_return(!bus_pid_changed(bus), -ECHILD);
344 bus->is_monitor = !!b;
348 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
349 assert_return(bus, -EINVAL);
350 assert_return(bus = bus_resolve(bus), -ENOPKG);
351 assert_return(bus->state == BUS_UNSET, -EPERM);
352 assert_return(!bus_pid_changed(bus), -ECHILD);
354 bus->accept_fd = !!b;
358 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
359 assert_return(bus, -EINVAL);
360 assert_return(bus = bus_resolve(bus), -ENOPKG);
361 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
362 assert_return(!bus_pid_changed(bus), -ECHILD);
364 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
365 * replies, and maybe one day classic D-Bus learns this too */
366 bus->attach_timestamp = !!b;
371 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
372 assert_return(bus, -EINVAL);
373 assert_return(bus = bus_resolve(bus), -ENOPKG);
374 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
375 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
376 assert_return(!bus_pid_changed(bus), -ECHILD);
378 SET_FLAG(bus->creds_mask, mask, b);
380 /* The well knowns we need unconditionally, so that matches can work */
381 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
386 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
387 assert_return(bus, -EINVAL);
388 assert_return(bus = bus_resolve(bus), -ENOPKG);
389 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
390 assert_return(bus->state == BUS_UNSET, -EPERM);
391 assert_return(!bus_pid_changed(bus), -ECHILD);
393 bus->is_server = !!b;
394 bus->server_id = server_id;
398 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
399 assert_return(bus, -EINVAL);
400 assert_return(bus = bus_resolve(bus), -ENOPKG);
401 assert_return(bus->state == BUS_UNSET, -EPERM);
402 assert_return(!bus_pid_changed(bus), -ECHILD);
404 bus->anonymous_auth = !!b;
408 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
409 assert_return(bus, -EINVAL);
410 assert_return(bus = bus_resolve(bus), -ENOPKG);
411 assert_return(bus->state == BUS_UNSET, -EPERM);
412 assert_return(!bus_pid_changed(bus), -ECHILD);
418 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
419 assert_return(bus, -EINVAL);
420 assert_return(bus = bus_resolve(bus), -ENOPKG);
421 assert_return(bus->state == BUS_UNSET, -EPERM);
422 assert_return(!bus_pid_changed(bus), -ECHILD);
424 return free_and_strdup(&bus->description, description);
427 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
428 assert_return(bus, -EINVAL);
429 assert_return(bus = bus_resolve(bus), -ENOPKG);
430 assert_return(!bus_pid_changed(bus), -ECHILD);
432 bus->allow_interactive_authorization = !!b;
436 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
437 assert_return(bus, -EINVAL);
438 assert_return(bus = bus_resolve(bus), -ENOPKG);
439 assert_return(!bus_pid_changed(bus), -ECHILD);
441 return bus->allow_interactive_authorization;
444 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
445 assert_return(bus, -EINVAL);
446 assert_return(bus = bus_resolve(bus), -ENOPKG);
447 assert_return(bus->state == BUS_UNSET, -EPERM);
448 assert_return(!bus_pid_changed(bus), -ECHILD);
450 bus->watch_bind = !!b;
454 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
455 assert_return(bus, -EINVAL);
456 assert_return(bus = bus_resolve(bus), -ENOPKG);
457 assert_return(!bus_pid_changed(bus), -ECHILD);
459 return bus->watch_bind;
462 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
463 assert_return(bus, -EINVAL);
464 assert_return(bus = bus_resolve(bus), -ENOPKG);
465 assert_return(bus->state == BUS_UNSET, -EPERM);
466 assert_return(!bus_pid_changed(bus), -ECHILD);
468 bus->connected_signal = !!b;
472 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
473 assert_return(bus, -EINVAL);
474 assert_return(bus = bus_resolve(bus), -ENOPKG);
475 assert_return(!bus_pid_changed(bus), -ECHILD);
477 return bus->connected_signal;
480 static int synthesize_connected_signal(sd_bus *bus) {
481 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
486 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
487 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
488 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
490 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
491 * that works independently from whether we connected to a full bus or just a direct connection. */
493 if (!bus->connected_signal)
496 r = sd_bus_message_new_signal(
499 "/org/freedesktop/DBus/Local",
500 "org.freedesktop.DBus.Local",
505 bus_message_set_sender_local(bus, m);
507 r = bus_seal_synthetic_message(bus, m);
511 r = bus_rqueue_make_room(bus);
515 /* Insert at the very front */
516 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
517 bus->rqueue[0] = TAKE_PTR(m);
523 void bus_set_state(sd_bus *bus, enum bus_state state) {
525 static const char * const table[_BUS_STATE_MAX] = {
526 [BUS_UNSET] = "UNSET",
527 [BUS_WATCH_BIND] = "WATCH_BIND",
528 [BUS_OPENING] = "OPENING",
529 [BUS_AUTHENTICATING] = "AUTHENTICATING",
530 [BUS_HELLO] = "HELLO",
531 [BUS_RUNNING] = "RUNNING",
532 [BUS_CLOSING] = "CLOSING",
533 [BUS_CLOSED] = "CLOSED",
537 assert(state < _BUS_STATE_MAX);
539 if (state == bus->state)
542 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
546 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
555 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
557 r = sd_bus_message_get_errno(reply);
561 r = sd_bus_message_read(reply, "s", &s);
565 if (!service_name_is_valid(s) || s[0] != ':')
572 free_and_replace(bus->unique_name, t);
574 if (bus->state == BUS_HELLO) {
575 bus_set_state(bus, BUS_RUNNING);
577 r = synthesize_connected_signal(bus);
585 static int bus_send_hello(sd_bus *bus) {
586 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
591 if (!bus->bus_client)
594 r = sd_bus_message_new_method_call(
597 "org.freedesktop.DBus",
598 "/org/freedesktop/DBus",
599 "org.freedesktop.DBus",
604 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
607 int bus_start_running(sd_bus *bus) {
608 struct reply_callback *c;
614 assert(bus->state < BUS_HELLO);
616 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
617 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
618 * adding a fixed value to all entries should not alter the internal order. */
620 n = now(CLOCK_MONOTONIC);
621 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
622 if (c->timeout_usec == 0)
625 c->timeout_usec = usec_add(n, c->timeout_usec);
628 if (bus->bus_client) {
629 bus_set_state(bus, BUS_HELLO);
633 bus_set_state(bus, BUS_RUNNING);
635 r = synthesize_connected_signal(bus);
642 static int parse_address_key(const char **p, const char *key, char **value) {
643 size_t l, n = 0, allocated = 0;
644 _cleanup_free_ char *r = NULL;
653 if (strncmp(*p, key, l) != 0)
666 while (!IN_SET(*a, ';', ',', 0)) {
680 c = (char) ((x << 4) | y);
687 if (!GREEDY_REALLOC(r, allocated, n + 2))
705 free_and_replace(*value, r);
710 static void skip_address_key(const char **p) {
714 *p += strcspn(*p, ",");
720 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
721 _cleanup_free_ char *path = NULL, *abstract = NULL;
730 while (!IN_SET(**p, 0, ';')) {
731 r = parse_address_key(p, "guid", guid);
737 r = parse_address_key(p, "path", &path);
743 r = parse_address_key(p, "abstract", &abstract);
752 if (!path && !abstract)
755 if (path && abstract)
760 if (l > sizeof(b->sockaddr.un.sun_path))
763 b->sockaddr.un.sun_family = AF_UNIX;
764 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
765 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
766 } else if (abstract) {
767 l = strlen(abstract);
768 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
771 b->sockaddr.un.sun_family = AF_UNIX;
772 b->sockaddr.un.sun_path[0] = 0;
773 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
774 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
782 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
783 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
785 struct addrinfo *result, hints = {
786 .ai_socktype = SOCK_STREAM,
787 .ai_flags = AI_ADDRCONFIG,
795 while (!IN_SET(**p, 0, ';')) {
796 r = parse_address_key(p, "guid", guid);
802 r = parse_address_key(p, "host", &host);
808 r = parse_address_key(p, "port", &port);
814 r = parse_address_key(p, "family", &family);
827 if (streq(family, "ipv4"))
828 hints.ai_family = AF_INET;
829 else if (streq(family, "ipv6"))
830 hints.ai_family = AF_INET6;
835 r = getaddrinfo(host, port, &hints, &result);
839 return -EADDRNOTAVAIL;
841 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
842 b->sockaddr_size = result->ai_addrlen;
844 freeaddrinfo(result);
851 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
853 unsigned n_argv = 0, j;
855 size_t allocated = 0;
863 while (!IN_SET(**p, 0, ';')) {
864 r = parse_address_key(p, "guid", guid);
870 r = parse_address_key(p, "path", &path);
876 if (startswith(*p, "argv")) {
880 ul = strtoul(*p + 4, (char**) p, 10);
881 if (errno > 0 || **p != '=' || ul > 256) {
889 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
897 r = parse_address_key(p, NULL, argv + ul);
912 /* Make sure there are no holes in the array, with the
913 * exception of argv[0] */
914 for (j = 1; j < n_argv; j++)
920 if (argv && argv[0] == NULL) {
921 argv[0] = strdup(path);
936 for (j = 0; j < n_argv; j++)
944 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
945 _cleanup_free_ char *machine = NULL, *pid = NULL;
953 while (!IN_SET(**p, 0, ';')) {
954 r = parse_address_key(p, "guid", guid);
960 r = parse_address_key(p, "machine", &machine);
966 r = parse_address_key(p, "pid", &pid);
975 if (!machine == !pid)
979 if (!machine_name_is_valid(machine))
982 free_and_replace(b->machine, machine);
984 b->machine = mfree(b->machine);
988 r = parse_pid(pid, &b->nspid);
994 b->sockaddr.un.sun_family = AF_UNIX;
995 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
996 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
997 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
1003 static void bus_reset_parsed_address(sd_bus *b) {
1007 b->sockaddr_size = 0;
1008 b->exec_argv = strv_free(b->exec_argv);
1009 b->exec_path = mfree(b->exec_path);
1010 b->server_id = SD_ID128_NULL;
1011 b->machine = mfree(b->machine);
1015 static int bus_parse_next_address(sd_bus *b) {
1016 _cleanup_free_ char *guid = NULL;
1024 if (b->address[b->address_index] == 0)
1027 bus_reset_parsed_address(b);
1029 a = b->address + b->address_index;
1038 if (startswith(a, "unix:")) {
1041 r = parse_unix_address(b, &a, &guid);
1046 } else if (startswith(a, "tcp:")) {
1049 r = parse_tcp_address(b, &a, &guid);
1055 } else if (startswith(a, "unixexec:")) {
1058 r = parse_exec_address(b, &a, &guid);
1064 } else if (startswith(a, "x-machine-unix:")) {
1067 r = parse_container_unix_address(b, &a, &guid);
1080 r = sd_id128_from_string(guid, &b->server_id);
1085 b->address_index = a - b->address;
1089 static void bus_kill_exec(sd_bus *bus) {
1090 if (pid_is_valid(bus->busexec_pid) > 0) {
1091 sigterm_wait(bus->busexec_pid);
1092 bus->busexec_pid = 0;
1096 static int bus_start_address(sd_bus *b) {
1102 bus_close_io_fds(b);
1103 bus_close_inotify_fd(b);
1107 /* If you provide multiple different bus-addresses, we
1108 * try all of them in order and use the first one that
1112 r = bus_socket_exec(b);
1113 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1114 r = bus_container_connect_socket(b);
1115 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1116 r = bus_socket_connect(b);
1123 q = bus_attach_io_events(b);
1127 q = bus_attach_inotify_event(b);
1134 b->last_connect_error = -r;
1137 r = bus_parse_next_address(b);
1141 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1145 int bus_next_address(sd_bus *b) {
1148 bus_reset_parsed_address(b);
1149 return bus_start_address(b);
1152 static int bus_start_fd(sd_bus *b) {
1157 assert(b->input_fd >= 0);
1158 assert(b->output_fd >= 0);
1160 r = fd_nonblock(b->input_fd, true);
1164 r = fd_cloexec(b->input_fd, true);
1168 if (b->input_fd != b->output_fd) {
1169 r = fd_nonblock(b->output_fd, true);
1173 r = fd_cloexec(b->output_fd, true);
1178 if (fstat(b->input_fd, &st) < 0)
1181 return bus_socket_take_fd(b);
1184 _public_ int sd_bus_start(sd_bus *bus) {
1187 assert_return(bus, -EINVAL);
1188 assert_return(bus = bus_resolve(bus), -ENOPKG);
1189 assert_return(bus->state == BUS_UNSET, -EPERM);
1190 assert_return(!bus_pid_changed(bus), -ECHILD);
1192 bus_set_state(bus, BUS_OPENING);
1194 if (bus->is_server && bus->bus_client)
1197 if (bus->input_fd >= 0)
1198 r = bus_start_fd(bus);
1199 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1200 r = bus_start_address(bus);
1209 return bus_send_hello(bus);
1212 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1217 assert_return(ret, -EINVAL);
1219 /* Let's connect to the starter bus if it is set, and
1220 * otherwise to the bus that is appropropriate for the scope
1221 * we are running in */
1223 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1225 if (streq(e, "system"))
1226 return sd_bus_open_system_with_description(ret, description);
1227 #if 0 /// elogind does not support systemd user instances
1228 else if (STR_IN_SET(e, "session", "user"))
1230 return sd_bus_open_user_with_description(ret, description);
1233 e = secure_getenv("DBUS_STARTER_ADDRESS");
1235 #if 0 /// elogind does not support systemd user instances
1236 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1237 return sd_bus_open_user_with_description(ret, description);
1240 return sd_bus_open_system_with_description(ret, description);
1247 r = sd_bus_set_address(b, e);
1251 b->bus_client = true;
1253 /* We don't know whether the bus is trusted or not, so better
1254 * be safe, and authenticate everything */
1256 b->is_local = false;
1257 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1259 r = sd_bus_start(b);
1271 _public_ int sd_bus_open(sd_bus **ret) {
1272 return sd_bus_open_with_description(ret, NULL);
1275 int bus_set_address_system(sd_bus *b) {
1279 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1281 return sd_bus_set_address(b, e);
1283 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1286 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1290 assert_return(ret, -EINVAL);
1297 r = sd_bus_set_description(b, description);
1302 r = bus_set_address_system(b);
1306 b->bus_client = true;
1307 b->is_system = true;
1309 /* Let's do per-method access control on the system bus. We
1310 * need the caller's UID and capability set for that. */
1312 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1315 r = sd_bus_start(b);
1327 _public_ int sd_bus_open_system(sd_bus **ret) {
1328 return sd_bus_open_system_with_description(ret, NULL);
1331 #if 0 /// elogind can not open/use a user bus
1332 int bus_set_address_user(sd_bus *b) {
1334 _cleanup_free_ char *ee = NULL, *s = NULL;
1338 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1340 return sd_bus_set_address(b, e);
1342 e = secure_getenv("XDG_RUNTIME_DIR");
1346 ee = bus_address_escape(e);
1350 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1353 b->address = TAKE_PTR(s);
1359 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1360 #if 0 /// elogind does not support user buses
1364 assert_return(ret, -EINVAL);
1371 r = sd_bus_set_description(b, description);
1376 r = bus_set_address_user(b);
1380 b->bus_client = true;
1383 /* We don't do any per-method access control on the user
1388 r = sd_bus_start(b);
1400 _public_ int sd_bus_open_user(sd_bus **ret) {
1401 return sd_bus_open_user_with_description(ret, NULL);
1403 return sd_bus_open_system(ret);
1407 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1408 _cleanup_free_ char *e = NULL;
1409 char *m = NULL, *c = NULL, *a;
1414 /* Let's see if we shall enter some container */
1415 m = strchr(host, ':');
1419 /* Let's make sure this is not a port of some kind,
1420 * and is a valid machine name. */
1421 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1424 /* Cut out the host part */
1425 t = strndupa(host, m - host - 1);
1426 e = bus_address_escape(t);
1430 c = strjoina(",argv5=--machine=", m);
1435 e = bus_address_escape(host);
1440 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=elogind-stdio-bridge", c);
1444 free_and_replace(b->address, a);
1449 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1453 assert_return(host, -EINVAL);
1454 assert_return(ret, -EINVAL);
1456 r = sd_bus_new(&bus);
1460 r = bus_set_address_system_remote(bus, host);
1464 bus->bus_client = true;
1465 bus->trusted = false;
1466 bus->is_system = true;
1467 bus->is_local = false;
1469 r = sd_bus_start(bus);
1481 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1482 _cleanup_free_ char *e = NULL;
1488 e = bus_address_escape(machine);
1492 a = strjoin("x-machine-unix:machine=", e);
1496 free_and_replace(b->address, a);
1501 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1505 assert_return(machine, -EINVAL);
1506 assert_return(ret, -EINVAL);
1507 assert_return(machine_name_is_valid(machine), -EINVAL);
1509 r = sd_bus_new(&bus);
1513 r = bus_set_address_system_machine(bus, machine);
1517 bus->bus_client = true;
1518 bus->trusted = false;
1519 bus->is_system = true;
1520 bus->is_local = false;
1522 r = sd_bus_start(bus);
1534 _public_ void sd_bus_close(sd_bus *bus) {
1538 if (bus->state == BUS_CLOSED)
1540 if (bus_pid_changed(bus))
1543 /* Don't leave ssh hanging around */
1546 bus_set_state(bus, BUS_CLOSED);
1548 sd_bus_detach_event(bus);
1550 /* Drop all queued messages so that they drop references to
1551 * the bus object and the bus may be freed */
1552 bus_reset_queues(bus);
1554 bus_close_io_fds(bus);
1555 bus_close_inotify_fd(bus);
1558 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1563 /* Have to do this before flush() to prevent hang */
1569 return sd_bus_unref(bus);
1572 void bus_enter_closing(sd_bus *bus) {
1575 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1578 bus_set_state(bus, BUS_CLOSING);
1581 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1586 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1591 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1597 i = REFCNT_DEC(bus->n_ref);
1605 _public_ int sd_bus_is_open(sd_bus *bus) {
1607 assert_return(bus, -EINVAL);
1608 assert_return(bus = bus_resolve(bus), -ENOPKG);
1609 assert_return(!bus_pid_changed(bus), -ECHILD);
1611 return BUS_IS_OPEN(bus->state);
1614 _public_ int sd_bus_is_ready(sd_bus *bus) {
1615 assert_return(bus, -EINVAL);
1616 assert_return(bus = bus_resolve(bus), -ENOPKG);
1617 assert_return(!bus_pid_changed(bus), -ECHILD);
1619 return bus->state == BUS_RUNNING;
1622 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1625 assert_return(bus, -EINVAL);
1626 assert_return(bus = bus_resolve(bus), -ENOPKG);
1627 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1628 assert_return(!bus_pid_changed(bus), -ECHILD);
1630 if (bus->is_monitor)
1633 if (type == SD_BUS_TYPE_UNIX_FD) {
1634 if (!bus->accept_fd)
1637 r = bus_ensure_running(bus);
1641 return bus->can_fds;
1644 return bus_type_is_valid(type);
1647 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1650 assert_return(bus, -EINVAL);
1651 assert_return(bus = bus_resolve(bus), -ENOPKG);
1652 assert_return(id, -EINVAL);
1653 assert_return(!bus_pid_changed(bus), -ECHILD);
1655 r = bus_ensure_running(bus);
1659 *id = bus->server_id;
1663 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1670 /* If we copy the same message to multiple
1671 * destinations, avoid using the same cookie
1673 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1678 timeout = BUS_DEFAULT_TIMEOUT;
1680 if (!m->sender && b->patch_sender) {
1681 r = sd_bus_message_set_sender(m, b->patch_sender);
1686 return sd_bus_message_seal(m, ++b->cookie, timeout);
1689 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1690 bool remarshal = false;
1694 /* wrong packet version */
1695 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1698 /* wrong packet endianness */
1699 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1702 return remarshal ? bus_message_remarshal(b, m) : 0;
1705 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1709 /* Fake some timestamps, if they were requested, and not
1710 * already initialized */
1711 if (b->attach_timestamp) {
1712 if (m->realtime <= 0)
1713 m->realtime = now(CLOCK_REALTIME);
1715 if (m->monotonic <= 0)
1716 m->monotonic = now(CLOCK_MONOTONIC);
1719 /* The bus specification says the serial number cannot be 0,
1720 * hence let's fill something in for synthetic messages. Since
1721 * synthetic messages might have a fake sender and we don't
1722 * want to interfere with the real sender's serial numbers we
1723 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1724 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1725 * even though kdbus can do 64bit. */
1726 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1729 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1735 r = bus_socket_write_message(bus, m, idx);
1739 if (*idx >= BUS_MESSAGE_SIZE(m))
1740 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",
1741 bus_message_type_to_string(m->header->type),
1742 strna(sd_bus_message_get_sender(m)),
1743 strna(sd_bus_message_get_destination(m)),
1744 strna(sd_bus_message_get_path(m)),
1745 strna(sd_bus_message_get_interface(m)),
1746 strna(sd_bus_message_get_member(m)),
1747 BUS_MESSAGE_COOKIE(m),
1749 strna(m->root_container.signature),
1750 strna(m->error.name),
1751 strna(m->error.message));
1756 static int dispatch_wqueue(sd_bus *bus) {
1760 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1762 while (bus->wqueue_size > 0) {
1764 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1768 /* Didn't do anything this time */
1770 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1771 /* Fully written. Let's drop the entry from
1774 * This isn't particularly optimized, but
1775 * well, this is supposed to be our worst-case
1776 * buffer only, and the socket buffer is
1777 * supposed to be our primary buffer, and if
1778 * it got full, then all bets are off
1782 sd_bus_message_unref(bus->wqueue[0]);
1783 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1793 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1796 return bus_socket_read_message(bus);
1799 int bus_rqueue_make_room(sd_bus *bus) {
1802 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1805 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1811 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1816 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1818 /* Note that the priority logic is only available on kdbus,
1819 * where the rqueue is unused. We check the rqueue here
1820 * anyway, because it's simple... */
1823 if (bus->rqueue_size > 0) {
1824 /* Dispatch a queued message */
1826 *m = bus->rqueue[0];
1828 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1832 /* Try to read a new message */
1833 r = bus_read_message(bus, hint_priority, priority);
1843 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1844 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1847 assert_return(m, -EINVAL);
1852 assert_return(!bus_pid_changed(bus), -ECHILD);
1854 if (!BUS_IS_OPEN(bus->state))
1858 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1865 /* If the cookie number isn't kept, then we know that no reply
1867 if (!cookie && !m->sealed)
1868 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1870 r = bus_seal_message(bus, m, 0);
1874 /* Remarshall if we have to. This will possibly unref the
1875 * message and place a replacement in m */
1876 r = bus_remarshal_message(bus, &m);
1880 /* If this is a reply and no reply was requested, then let's
1881 * suppress this, if we can */
1885 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1888 r = bus_write_message(bus, m, &idx);
1890 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1891 bus_enter_closing(bus);
1898 if (idx < BUS_MESSAGE_SIZE(m)) {
1899 /* Wasn't fully written. So let's remember how
1900 * much was written. Note that the first entry
1901 * of the wqueue array is always allocated so
1902 * that we always can remember how much was
1904 bus->wqueue[0] = sd_bus_message_ref(m);
1905 bus->wqueue_size = 1;
1910 /* Just append it to the queue. */
1912 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1915 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1918 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1923 *cookie = BUS_MESSAGE_COOKIE(m);
1928 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1931 assert_return(m, -EINVAL);
1936 assert_return(!bus_pid_changed(bus), -ECHILD);
1938 if (!BUS_IS_OPEN(bus->state))
1941 if (!streq_ptr(m->destination, destination)) {
1946 r = sd_bus_message_set_destination(m, destination);
1951 return sd_bus_send(bus, m, cookie);
1954 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1957 if (usec == (uint64_t) -1)
1960 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1961 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1962 * relative timestamp, and afterwards the absolute one. */
1964 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1967 return now(CLOCK_MONOTONIC) + usec;
1970 static int timeout_compare(const void *a, const void *b) {
1971 const struct reply_callback *x = a, *y = b;
1973 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1976 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1979 if (x->timeout_usec < y->timeout_usec)
1982 if (x->timeout_usec > y->timeout_usec)
1988 _public_ int sd_bus_call_async(
1992 sd_bus_message_handler_t callback,
1996 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1997 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
2000 assert_return(m, -EINVAL);
2001 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
2002 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
2007 assert_return(!bus_pid_changed(bus), -ECHILD);
2009 if (!BUS_IS_OPEN(bus->state))
2012 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
2013 if (!callback && !slot && !m->sealed)
2014 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
2016 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
2020 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
2024 r = bus_seal_message(bus, m, usec);
2028 r = bus_remarshal_message(bus, &m);
2032 if (slot || callback) {
2033 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2037 s->reply_callback.callback = callback;
2039 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2040 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2042 s->reply_callback.cookie = 0;
2046 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2047 if (s->reply_callback.timeout_usec != 0) {
2048 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2050 s->reply_callback.timeout_usec = 0;
2056 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2067 int bus_ensure_running(sd_bus *bus) {
2072 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2074 if (bus->state == BUS_RUNNING)
2078 r = sd_bus_process(bus, NULL);
2081 if (bus->state == BUS_RUNNING)
2086 r = sd_bus_wait(bus, (uint64_t) -1);
2092 _public_ int sd_bus_call(
2096 sd_bus_error *error,
2097 sd_bus_message **reply) {
2099 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2105 bus_assert_return(m, -EINVAL, error);
2106 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2107 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2108 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2113 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2115 if (!BUS_IS_OPEN(bus->state)) {
2120 r = bus_ensure_running(bus);
2124 i = bus->rqueue_size;
2126 r = bus_seal_message(bus, m, usec);
2130 r = bus_remarshal_message(bus, &m);
2134 r = sd_bus_send(bus, m, &cookie);
2138 timeout = calc_elapse(bus, m->timeout);
2143 while (i < bus->rqueue_size) {
2144 sd_bus_message *incoming = NULL;
2146 incoming = bus->rqueue[i];
2148 if (incoming->reply_cookie == cookie) {
2149 /* Found a match! */
2151 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2153 log_debug_bus_message(incoming);
2155 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2157 if (incoming->n_fds <= 0 || bus->accept_fd) {
2161 sd_bus_message_unref(incoming);
2166 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2167 sd_bus_message_unref(incoming);
2170 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2171 r = sd_bus_error_copy(error, &incoming->error);
2172 sd_bus_message_unref(incoming);
2179 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2182 streq(bus->unique_name, incoming->sender)) {
2184 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2187 /* Our own message? Somebody is trying
2188 * to send its own client a message,
2189 * let's not dead-lock, let's fail
2192 sd_bus_message_unref(incoming);
2197 /* Try to read more, right-away */
2201 r = bus_read_message(bus, false, 0);
2203 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2204 bus_enter_closing(bus);
2216 n = now(CLOCK_MONOTONIC);
2224 left = (uint64_t) -1;
2226 r = bus_poll(bus, true, left);
2234 r = dispatch_wqueue(bus);
2236 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2237 bus_enter_closing(bus);
2246 return sd_bus_error_set_errno(error, r);
2249 _public_ int sd_bus_get_fd(sd_bus *bus) {
2251 assert_return(bus, -EINVAL);
2252 assert_return(bus = bus_resolve(bus), -ENOPKG);
2253 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2254 assert_return(!bus_pid_changed(bus), -ECHILD);
2256 if (bus->state == BUS_CLOSED)
2259 if (bus->inotify_fd >= 0)
2260 return bus->inotify_fd;
2262 if (bus->input_fd >= 0)
2263 return bus->input_fd;
2268 _public_ int sd_bus_get_events(sd_bus *bus) {
2271 assert_return(bus, -EINVAL);
2272 assert_return(bus = bus_resolve(bus), -ENOPKG);
2273 assert_return(!bus_pid_changed(bus), -ECHILD);
2275 switch (bus->state) {
2281 case BUS_WATCH_BIND:
2289 case BUS_AUTHENTICATING:
2290 if (bus_socket_auth_needs_write(bus))
2298 if (bus->rqueue_size <= 0)
2300 if (bus->wqueue_size > 0)
2308 assert_not_reached("Unknown state");
2314 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2315 struct reply_callback *c;
2317 assert_return(bus, -EINVAL);
2318 assert_return(bus = bus_resolve(bus), -ENOPKG);
2319 assert_return(timeout_usec, -EINVAL);
2320 assert_return(!bus_pid_changed(bus), -ECHILD);
2322 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2325 if (bus->track_queue) {
2330 switch (bus->state) {
2332 case BUS_AUTHENTICATING:
2333 *timeout_usec = bus->auth_timeout;
2338 if (bus->rqueue_size > 0) {
2343 c = prioq_peek(bus->reply_callbacks_prioq);
2345 *timeout_usec = (uint64_t) -1;
2349 if (c->timeout_usec == 0) {
2350 *timeout_usec = (uint64_t) -1;
2354 *timeout_usec = c->timeout_usec;
2361 case BUS_WATCH_BIND:
2363 *timeout_usec = (uint64_t) -1;
2367 assert_not_reached("Unknown or unexpected stat");
2371 static int process_timeout(sd_bus *bus) {
2372 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2373 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2374 struct reply_callback *c;
2381 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2383 c = prioq_peek(bus->reply_callbacks_prioq);
2387 n = now(CLOCK_MONOTONIC);
2388 if (c->timeout_usec > n)
2391 r = bus_message_new_synthetic_error(
2394 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2399 r = bus_seal_synthetic_message(bus, m);
2403 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2404 c->timeout_usec = 0;
2406 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2409 slot = container_of(c, sd_bus_slot, reply_callback);
2411 bus->iteration_counter++;
2413 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2415 bus->current_message = m;
2416 bus->current_slot = sd_bus_slot_ref(slot);
2417 bus->current_handler = c->callback;
2418 bus->current_userdata = slot->userdata;
2419 r = c->callback(m, slot->userdata, &error_buffer);
2420 bus->current_userdata = NULL;
2421 bus->current_handler = NULL;
2422 bus->current_slot = NULL;
2423 bus->current_message = NULL;
2425 if (slot->floating) {
2426 bus_slot_disconnect(slot);
2427 sd_bus_slot_unref(slot);
2430 sd_bus_slot_unref(slot);
2432 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2433 * and ignore the callback handler's return value. */
2437 return bus_maybe_reply_error(m, r, &error_buffer);
2440 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2444 if (bus->state != BUS_HELLO)
2447 /* Let's make sure the first message on the bus is the HELLO
2448 * reply. But note that we don't actually parse the message
2449 * here (we leave that to the usual handling), we just verify
2450 * we don't let any earlier msg through. */
2452 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2455 if (m->reply_cookie != 1)
2461 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2462 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2463 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2464 struct reply_callback *c;
2472 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2475 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2478 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2484 slot = container_of(c, sd_bus_slot, reply_callback);
2486 if (m->n_fds > 0 && !bus->accept_fd) {
2488 /* If the reply contained a file descriptor which we
2489 * didn't want we pass an error instead. */
2491 r = bus_message_new_synthetic_error(
2494 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2499 /* Copy over original timestamp */
2500 synthetic_reply->realtime = m->realtime;
2501 synthetic_reply->monotonic = m->monotonic;
2502 synthetic_reply->seqnum = m->seqnum;
2504 r = bus_seal_synthetic_message(bus, synthetic_reply);
2508 m = synthetic_reply;
2510 r = sd_bus_message_rewind(m, true);
2515 if (c->timeout_usec != 0) {
2516 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2517 c->timeout_usec = 0;
2520 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2522 bus->current_slot = sd_bus_slot_ref(slot);
2523 bus->current_handler = c->callback;
2524 bus->current_userdata = slot->userdata;
2525 r = c->callback(m, slot->userdata, &error_buffer);
2526 bus->current_userdata = NULL;
2527 bus->current_handler = NULL;
2528 bus->current_slot = NULL;
2530 if (slot->floating) {
2531 bus_slot_disconnect(slot);
2532 sd_bus_slot_unref(slot);
2535 sd_bus_slot_unref(slot);
2537 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2538 * ignore the callback handler's return value. */
2542 return bus_maybe_reply_error(m, r, &error_buffer);
2545 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2546 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2547 struct filter_callback *l;
2554 bus->filter_callbacks_modified = false;
2556 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2559 if (bus->filter_callbacks_modified)
2562 /* Don't run this more than once per iteration */
2563 if (l->last_iteration == bus->iteration_counter)
2566 l->last_iteration = bus->iteration_counter;
2568 r = sd_bus_message_rewind(m, true);
2572 slot = container_of(l, sd_bus_slot, filter_callback);
2574 bus->current_slot = sd_bus_slot_ref(slot);
2575 bus->current_handler = l->callback;
2576 bus->current_userdata = slot->userdata;
2577 r = l->callback(m, slot->userdata, &error_buffer);
2578 bus->current_userdata = NULL;
2579 bus->current_handler = NULL;
2580 bus->current_slot = sd_bus_slot_unref(slot);
2582 r = bus_maybe_reply_error(m, r, &error_buffer);
2588 } while (bus->filter_callbacks_modified);
2593 static int process_match(sd_bus *bus, sd_bus_message *m) {
2600 bus->match_callbacks_modified = false;
2602 r = bus_match_run(bus, &bus->match_callbacks, m);
2606 } while (bus->match_callbacks_modified);
2611 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2612 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2618 if (bus->is_monitor)
2621 if (bus->manual_peer_interface)
2624 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2627 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2630 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2633 if (streq_ptr(m->member, "Ping"))
2634 r = sd_bus_message_new_method_return(m, &reply);
2635 else if (streq_ptr(m->member, "GetMachineId")) {
2639 r = sd_id128_get_machine(&id);
2643 r = sd_bus_message_new_method_return(m, &reply);
2647 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2649 r = sd_bus_message_new_method_errorf(
2651 SD_BUS_ERROR_UNKNOWN_METHOD,
2652 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2658 r = sd_bus_send(bus, reply, NULL);
2665 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2669 /* If we got a message with a file descriptor which we didn't
2670 * want to accept, then let's drop it. How can this even
2671 * happen? For example, when the kernel queues a message into
2672 * an activatable names's queue which allows fds, and then is
2673 * delivered to us later even though we ourselves did not
2676 if (bus->is_monitor)
2685 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2686 return 1; /* just eat it up */
2688 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2691 static int process_message(sd_bus *bus, sd_bus_message *m) {
2697 bus->current_message = m;
2698 bus->iteration_counter++;
2700 log_debug_bus_message(m);
2702 r = process_hello(bus, m);
2706 r = process_reply(bus, m);
2710 r = process_fd_check(bus, m);
2714 r = process_filter(bus, m);
2718 r = process_match(bus, m);
2722 r = process_builtin(bus, m);
2726 r = bus_process_object(bus, m);
2729 bus->current_message = NULL;
2733 static int dispatch_track(sd_bus *bus) {
2736 if (!bus->track_queue)
2739 bus_track_dispatch(bus->track_queue);
2743 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2744 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2748 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2750 r = process_timeout(bus);
2754 r = dispatch_wqueue(bus);
2758 r = dispatch_track(bus);
2762 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2768 r = process_message(bus, m);
2773 r = sd_bus_message_rewind(m, true);
2782 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2784 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2785 strna(sd_bus_message_get_sender(m)),
2786 strna(sd_bus_message_get_path(m)),
2787 strna(sd_bus_message_get_interface(m)),
2788 strna(sd_bus_message_get_member(m)));
2790 r = sd_bus_reply_method_errorf(
2792 SD_BUS_ERROR_UNKNOWN_OBJECT,
2793 "Unknown object '%s'.", m->path);
2807 static int bus_exit_now(sd_bus *bus) {
2810 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2811 * sd_event_exit(), otherwise invokes libc exit(). */
2813 if (bus->exited) /* did we already exit? */
2815 if (!bus->exit_triggered) /* was the exit condition triggered? */
2817 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2820 bus->exited = true; /* never exit more than once */
2822 log_debug("Bus connection disconnected, exiting.");
2825 return sd_event_exit(bus->event, EXIT_FAILURE);
2829 assert_not_reached("exit() didn't exit?");
2832 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2833 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2834 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2841 r = bus_message_new_synthetic_error(
2844 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2849 r = bus_seal_synthetic_message(bus, m);
2853 if (c->timeout_usec != 0) {
2854 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2855 c->timeout_usec = 0;
2858 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2861 slot = container_of(c, sd_bus_slot, reply_callback);
2863 bus->iteration_counter++;
2865 bus->current_message = m;
2866 bus->current_slot = sd_bus_slot_ref(slot);
2867 bus->current_handler = c->callback;
2868 bus->current_userdata = slot->userdata;
2869 r = c->callback(m, slot->userdata, &error_buffer);
2870 bus->current_userdata = NULL;
2871 bus->current_handler = NULL;
2872 bus->current_slot = NULL;
2873 bus->current_message = NULL;
2875 if (slot->floating) {
2876 bus_slot_disconnect(slot);
2877 sd_bus_slot_unref(slot);
2880 sd_bus_slot_unref(slot);
2882 return bus_maybe_reply_error(m, r, &error_buffer);
2885 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2886 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2887 struct reply_callback *c;
2891 assert(bus->state == BUS_CLOSING);
2893 /* First, fail all outstanding method calls */
2894 c = ordered_hashmap_first(bus->reply_callbacks);
2896 return process_closing_reply_callback(bus, c);
2898 /* Then, fake-drop all remaining bus tracking references */
2900 bus_track_close(bus->tracks);
2904 /* Then, synthesize a Disconnected message */
2905 r = sd_bus_message_new_signal(
2908 "/org/freedesktop/DBus/Local",
2909 "org.freedesktop.DBus.Local",
2914 bus_message_set_sender_local(bus, m);
2916 r = bus_seal_synthetic_message(bus, m);
2922 bus->current_message = m;
2923 bus->iteration_counter++;
2925 r = process_filter(bus, m);
2929 r = process_match(bus, m);
2933 /* Nothing else to do, exit now, if the condition holds */
2934 bus->exit_triggered = true;
2935 (void) bus_exit_now(bus);
2943 bus->current_message = NULL;
2948 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2949 BUS_DONT_DESTROY(bus);
2952 /* Returns 0 when we didn't do anything. This should cause the
2953 * caller to invoke sd_bus_wait() before returning the next
2954 * time. Returns > 0 when we did something, which possibly
2955 * means *ret is filled in with an unprocessed message. */
2957 assert_return(bus, -EINVAL);
2958 assert_return(bus = bus_resolve(bus), -ENOPKG);
2959 assert_return(!bus_pid_changed(bus), -ECHILD);
2961 /* We don't allow recursively invoking sd_bus_process(). */
2962 assert_return(!bus->current_message, -EBUSY);
2963 assert(!bus->current_slot);
2965 switch (bus->state) {
2973 case BUS_WATCH_BIND:
2974 r = bus_socket_process_watch_bind(bus);
2978 r = bus_socket_process_opening(bus);
2981 case BUS_AUTHENTICATING:
2982 r = bus_socket_process_authenticating(bus);
2987 r = process_running(bus, hint_priority, priority, ret);
2991 /* This branch initializes *ret, hence we don't use the generic error checking below */
2995 return process_closing(bus, ret);
2998 assert_not_reached("Unknown state");
3001 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3002 bus_enter_closing(bus);
3013 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
3014 return bus_process_internal(bus, false, 0, ret);
3017 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
3018 return bus_process_internal(bus, true, priority, ret);
3021 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
3022 struct pollfd p[2] = {};
3025 usec_t m = USEC_INFINITY;
3029 if (bus->state == BUS_CLOSING)
3032 if (!BUS_IS_OPEN(bus->state))
3035 if (bus->state == BUS_WATCH_BIND) {
3036 assert(bus->inotify_fd >= 0);
3038 p[0].events = POLLIN;
3039 p[0].fd = bus->inotify_fd;
3044 e = sd_bus_get_events(bus);
3049 /* The caller really needs some more data, he doesn't
3050 * care about what's already read, or any timeouts
3051 * except its own. */
3055 /* The caller wants to process if there's something to
3056 * process, but doesn't care otherwise */
3058 r = sd_bus_get_timeout(bus, &until);
3062 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3065 p[0].fd = bus->input_fd;
3066 if (bus->output_fd == bus->input_fd) {
3070 p[0].events = e & POLLIN;
3071 p[1].fd = bus->output_fd;
3072 p[1].events = e & POLLOUT;
3077 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3080 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3084 return r > 0 ? 1 : 0;
3087 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3089 assert_return(bus, -EINVAL);
3090 assert_return(bus = bus_resolve(bus), -ENOPKG);
3091 assert_return(!bus_pid_changed(bus), -ECHILD);
3093 if (bus->state == BUS_CLOSING)
3096 if (!BUS_IS_OPEN(bus->state))
3099 if (bus->rqueue_size > 0)
3102 return bus_poll(bus, false, timeout_usec);
3105 _public_ int sd_bus_flush(sd_bus *bus) {
3108 assert_return(bus, -EINVAL);
3109 assert_return(bus = bus_resolve(bus), -ENOPKG);
3110 assert_return(!bus_pid_changed(bus), -ECHILD);
3112 if (bus->state == BUS_CLOSING)
3115 if (!BUS_IS_OPEN(bus->state))
3118 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3119 if (bus->state == BUS_WATCH_BIND)
3122 r = bus_ensure_running(bus);
3126 if (bus->wqueue_size <= 0)
3130 r = dispatch_wqueue(bus);
3132 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3133 bus_enter_closing(bus);
3140 if (bus->wqueue_size <= 0)
3143 r = bus_poll(bus, false, (uint64_t) -1);
3149 _public_ int sd_bus_add_filter(
3152 sd_bus_message_handler_t callback,
3157 assert_return(bus, -EINVAL);
3158 assert_return(bus = bus_resolve(bus), -ENOPKG);
3159 assert_return(callback, -EINVAL);
3160 assert_return(!bus_pid_changed(bus), -ECHILD);
3162 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3166 s->filter_callback.callback = callback;
3168 bus->filter_callbacks_modified = true;
3169 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3177 static int add_match_callback(
3180 sd_bus_error *ret_error) {
3182 sd_bus_slot *match_slot = userdata;
3183 bool failed = false;
3189 sd_bus_slot_ref(match_slot);
3191 if (sd_bus_message_is_method_error(m, NULL)) {
3192 log_debug_errno(sd_bus_message_get_errno(m),
3193 "Unable to add match %s, failing connection: %s",
3194 match_slot->match_callback.match_string,
3195 sd_bus_message_get_error(m)->message);
3199 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3201 if (match_slot->match_callback.install_callback) {
3204 bus = sd_bus_message_get_bus(m);
3206 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3207 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3210 assert(bus->current_slot == match_slot->match_callback.install_slot);
3211 assert(bus->current_handler == add_match_callback);
3212 assert(bus->current_userdata == userdata);
3214 bus->current_slot = match_slot;
3215 bus->current_handler = match_slot->match_callback.install_callback;
3216 bus->current_userdata = match_slot->userdata;
3218 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3220 bus->current_slot = match_slot->match_callback.install_slot;
3221 bus->current_handler = add_match_callback;
3222 bus->current_userdata = userdata;
3224 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3226 if (failed) /* Generic failure handling: destroy the connection */
3227 bus_enter_closing(sd_bus_message_get_bus(m));
3232 if (failed && match_slot->floating) {
3233 bus_slot_disconnect(match_slot);
3234 sd_bus_slot_unref(match_slot);
3237 sd_bus_slot_unref(match_slot);
3242 static int bus_add_match_full(
3247 sd_bus_message_handler_t callback,
3248 sd_bus_message_handler_t install_callback,
3251 struct bus_match_component *components = NULL;
3252 unsigned n_components = 0;
3253 sd_bus_slot *s = NULL;
3256 assert_return(bus, -EINVAL);
3257 assert_return(bus = bus_resolve(bus), -ENOPKG);
3258 assert_return(match, -EINVAL);
3259 assert_return(!bus_pid_changed(bus), -ECHILD);
3261 r = bus_match_parse(match, &components, &n_components);
3265 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3271 s->match_callback.callback = callback;
3272 s->match_callback.install_callback = install_callback;
3274 if (bus->bus_client) {
3275 enum bus_match_scope scope;
3277 scope = bus_match_get_scope(components, n_components);
3279 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3280 if (scope != BUS_MATCH_LOCAL) {
3282 /* We store the original match string, so that we can use it to remove the match again. */
3284 s->match_callback.match_string = strdup(match);
3285 if (!s->match_callback.match_string) {
3291 r = bus_add_match_internal_async(bus,
3292 &s->match_callback.install_slot,
3293 s->match_callback.match_string,
3297 r = bus_add_match_internal(bus, s->match_callback.match_string);
3301 s->match_added = true;
3305 bus->match_callbacks_modified = true;
3306 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3315 bus_match_parse_free(components, n_components);
3316 sd_bus_slot_unref(s);
3321 #if 0 /// UNNEEDED by elogind
3323 _public_ int sd_bus_add_match(
3327 sd_bus_message_handler_t callback,
3330 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3333 _public_ int sd_bus_add_match_async(
3337 sd_bus_message_handler_t callback,
3338 sd_bus_message_handler_t install_callback,
3341 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3344 bool bus_pid_changed(sd_bus *bus) {
3347 /* We don't support people creating a bus connection and
3348 * keeping it around over a fork(). Let's complain. */
3350 return bus->original_pid != getpid_cached();
3353 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3354 sd_bus *bus = userdata;
3359 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3361 r = sd_bus_process(bus, NULL);
3363 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3364 bus_enter_closing(bus);
3370 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3371 sd_bus *bus = userdata;
3376 r = sd_bus_process(bus, NULL);
3378 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3379 bus_enter_closing(bus);
3385 static int prepare_callback(sd_event_source *s, void *userdata) {
3386 sd_bus *bus = userdata;
3393 e = sd_bus_get_events(bus);
3399 if (bus->output_fd != bus->input_fd) {
3401 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3405 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3407 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3411 r = sd_bus_get_timeout(bus, &until);
3417 j = sd_event_source_set_time(bus->time_event_source, until);
3424 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3431 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3432 bus_enter_closing(bus);
3437 static int quit_callback(sd_event_source *event, void *userdata) {
3438 sd_bus *bus = userdata;
3448 int bus_attach_io_events(sd_bus *bus) {
3453 if (bus->input_fd < 0)
3459 if (!bus->input_io_event_source) {
3460 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3464 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3468 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3472 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3474 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3479 if (bus->output_fd != bus->input_fd) {
3480 assert(bus->output_fd >= 0);
3482 if (!bus->output_io_event_source) {
3483 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3487 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3491 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3493 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3502 static void bus_detach_io_events(sd_bus *bus) {
3505 if (bus->input_io_event_source) {
3506 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3507 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3510 if (bus->output_io_event_source) {
3511 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3512 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3516 int bus_attach_inotify_event(sd_bus *bus) {
3521 if (bus->inotify_fd < 0)
3527 if (!bus->inotify_event_source) {
3528 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3532 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3536 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3538 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3545 static void bus_detach_inotify_event(sd_bus *bus) {
3548 if (bus->inotify_event_source) {
3549 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3550 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3554 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3557 assert_return(bus, -EINVAL);
3558 assert_return(bus = bus_resolve(bus), -ENOPKG);
3559 assert_return(!bus->event, -EBUSY);
3561 assert(!bus->input_io_event_source);
3562 assert(!bus->output_io_event_source);
3563 assert(!bus->time_event_source);
3566 bus->event = sd_event_ref(event);
3568 r = sd_event_default(&bus->event);
3573 bus->event_priority = priority;
3575 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3579 r = sd_event_source_set_priority(bus->time_event_source, priority);
3583 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3587 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3591 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3595 r = bus_attach_io_events(bus);
3599 r = bus_attach_inotify_event(bus);
3606 sd_bus_detach_event(bus);
3610 _public_ int sd_bus_detach_event(sd_bus *bus) {
3611 assert_return(bus, -EINVAL);
3612 assert_return(bus = bus_resolve(bus), -ENOPKG);
3617 bus_detach_io_events(bus);
3618 bus_detach_inotify_event(bus);
3620 if (bus->time_event_source) {
3621 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3622 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3625 if (bus->quit_event_source) {
3626 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3627 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3630 bus->event = sd_event_unref(bus->event);
3634 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3635 assert_return(bus, NULL);
3640 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3641 assert_return(bus, NULL);
3643 return bus->current_message;
3646 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3647 assert_return(bus, NULL);
3649 return bus->current_slot;
3652 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3653 assert_return(bus, NULL);
3655 return bus->current_handler;
3658 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3659 assert_return(bus, NULL);
3661 return bus->current_userdata;
3664 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3669 assert(default_bus);
3672 return !!*default_bus;
3675 *ret = sd_bus_ref(*default_bus);
3683 b->default_bus_ptr = default_bus;
3691 _public_ int sd_bus_default_system(sd_bus **ret) {
3692 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3695 _public_ int sd_bus_default_user(sd_bus **ret) {
3696 #if 0 /// elogind does not support user buses
3697 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3699 return sd_bus_default_system(ret);
3703 _public_ int sd_bus_default(sd_bus **ret) {
3704 int (*bus_open)(sd_bus **) = NULL;
3707 busp = bus_choose_default(&bus_open);
3708 return bus_default(bus_open, busp, ret);
3711 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3712 assert_return(b, -EINVAL);
3713 assert_return(tid, -EINVAL);
3714 assert_return(!bus_pid_changed(b), -ECHILD);
3722 return sd_event_get_tid(b->event, tid);
3727 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3728 _cleanup_free_ char *e = NULL;
3731 assert_return(object_path_is_valid(prefix), -EINVAL);
3732 assert_return(external_id, -EINVAL);
3733 assert_return(ret_path, -EINVAL);
3735 e = bus_label_escape(external_id);
3739 ret = strjoin(prefix, "/", e);
3747 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3751 assert_return(object_path_is_valid(path), -EINVAL);
3752 assert_return(object_path_is_valid(prefix), -EINVAL);
3753 assert_return(external_id, -EINVAL);
3755 e = object_path_startswith(path, prefix);
3757 *external_id = NULL;
3761 ret = bus_label_unescape(e);
3769 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3770 _cleanup_strv_free_ char **labels = NULL;
3771 char *path, *path_pos, **label_pos;
3772 const char *sep, *template_pos;
3777 assert_return(out, -EINVAL);
3778 assert_return(path_template, -EINVAL);
3780 path_length = strlen(path_template);
3782 va_start(list, path_template);
3783 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3787 arg = va_arg(list, const char *);
3793 label = bus_label_escape(arg);
3799 r = strv_consume(&labels, label);
3805 /* add label length, but account for the format character */
3806 path_length += strlen(label) - 1;
3810 path = malloc(path_length + 1);
3817 for (template_pos = path_template; *template_pos; ) {
3818 sep = strchrnul(template_pos, '%');
3819 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3823 path_pos = stpcpy(path_pos, *label_pos++);
3824 template_pos = sep + 1;
3832 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3833 _cleanup_strv_free_ char **labels = NULL;
3834 const char *template_pos, *path_pos;
3840 * This decodes an object-path based on a template argument. The
3841 * template consists of a verbatim path, optionally including special
3844 * - Each occurrence of '%' in the template matches an arbitrary
3845 * substring of a label in the given path. At most one such
3846 * directive is allowed per label. For each such directive, the
3847 * caller must provide an output parameter (char **) via va_arg. If
3848 * NULL is passed, the given label is verified, but not returned.
3849 * For each matched label, the *decoded* label is stored in the
3850 * passed output argument, and the caller is responsible to free
3851 * it. Note that the output arguments are only modified if the
3852 * actualy path matched the template. Otherwise, they're left
3855 * This function returns <0 on error, 0 if the path does not match the
3856 * template, 1 if it matched.
3859 assert_return(path, -EINVAL);
3860 assert_return(path_template, -EINVAL);
3864 for (template_pos = path_template; *template_pos; ) {
3869 /* verify everything until the next '%' matches verbatim */
3870 sep = strchrnul(template_pos, '%');
3871 length = sep - template_pos;
3872 if (strncmp(path_pos, template_pos, length))
3876 template_pos += length;
3881 /* We found the next '%' character. Everything up until here
3882 * matched. We now skip ahead to the end of this label and make
3883 * sure it matches the tail of the label in the path. Then we
3884 * decode the string in-between and save it for later use. */
3886 ++template_pos; /* skip over '%' */
3888 sep = strchrnul(template_pos, '/');
3889 length = sep - template_pos; /* length of suffix to match verbatim */
3891 /* verify the suffixes match */
3892 sep = strchrnul(path_pos, '/');
3893 if (sep - path_pos < (ssize_t)length ||
3894 strncmp(sep - length, template_pos, length))
3897 template_pos += length; /* skip over matched label */
3898 length = sep - path_pos - length; /* length of sub-label to decode */
3900 /* store unescaped label for later use */
3901 label = bus_label_unescape_n(path_pos, length);
3905 r = strv_consume(&labels, label);
3909 path_pos = sep; /* skip decoded label and suffix */
3912 /* end of template must match end of path */
3916 /* copy the labels over to the caller */
3917 va_start(list, path_template);
3918 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3921 arg = va_arg(list, char **);
3929 labels = mfree(labels);
3933 _public_ int sd_bus_try_close(sd_bus *bus) {
3934 assert_return(bus, -EINVAL);
3935 assert_return(bus = bus_resolve(bus), -ENOPKG);
3936 assert_return(!bus_pid_changed(bus), -ECHILD);
3941 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3942 assert_return(bus, -EINVAL);
3943 assert_return(bus = bus_resolve(bus), -ENOPKG);
3944 assert_return(description, -EINVAL);
3945 assert_return(bus->description, -ENXIO);
3946 assert_return(!bus_pid_changed(bus), -ECHILD);
3948 if (bus->description)
3949 *description = bus->description;
3950 else if (bus->is_system)
3951 *description = "system";
3952 else if (bus->is_user)
3953 *description = "user";
3955 *description = NULL;
3960 int bus_get_root_path(sd_bus *bus) {
3963 if (bus->cgroup_root)
3966 r = cg_get_root_path(&bus->cgroup_root);
3968 bus->cgroup_root = strdup("/");
3969 if (!bus->cgroup_root)
3978 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3979 assert_return(bus, -EINVAL);
3980 assert_return(bus = bus_resolve(bus), -ENOPKG);
3981 assert_return(scope, -EINVAL);
3982 assert_return(!bus_pid_changed(bus), -ECHILD);
3989 if (bus->is_system) {
3997 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3999 assert_return(bus, -EINVAL);
4000 assert_return(bus = bus_resolve(bus), -ENOPKG);
4001 assert_return(address, -EINVAL);
4002 assert_return(!bus_pid_changed(bus), -ECHILD);
4005 *address = bus->address;
4012 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
4013 assert_return(bus, -EINVAL);
4014 assert_return(bus = bus_resolve(bus), -ENOPKG);
4015 assert_return(mask, -EINVAL);
4016 assert_return(!bus_pid_changed(bus), -ECHILD);
4018 *mask = bus->creds_mask;
4022 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
4023 assert_return(bus, -EINVAL);
4024 assert_return(bus = bus_resolve(bus), -ENOPKG);
4025 assert_return(!bus_pid_changed(bus), -ECHILD);
4027 return bus->bus_client;
4030 _public_ int sd_bus_is_server(sd_bus *bus) {
4031 assert_return(bus, -EINVAL);
4032 assert_return(bus = bus_resolve(bus), -ENOPKG);
4033 assert_return(!bus_pid_changed(bus), -ECHILD);
4035 return bus->is_server;
4038 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4039 assert_return(bus, -EINVAL);
4040 assert_return(bus = bus_resolve(bus), -ENOPKG);
4041 assert_return(!bus_pid_changed(bus), -ECHILD);
4043 return bus->anonymous_auth;
4046 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4047 assert_return(bus, -EINVAL);
4048 assert_return(bus = bus_resolve(bus), -ENOPKG);
4049 assert_return(!bus_pid_changed(bus), -ECHILD);
4051 return bus->trusted;
4054 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4055 assert_return(bus, -EINVAL);
4056 assert_return(bus = bus_resolve(bus), -ENOPKG);
4057 assert_return(!bus_pid_changed(bus), -ECHILD);
4059 return bus->is_monitor;
4062 static void flush_close(sd_bus *bus) {
4066 /* Flushes and closes the specified bus. We take a ref before,
4067 * to ensure the flushing does not cause the bus to be
4070 sd_bus_flush_close_unref(sd_bus_ref(bus));
4073 _public_ void sd_bus_default_flush_close(void) {
4074 flush_close(default_starter_bus);
4075 #if 0 /// elogind does not support user buses
4076 flush_close(default_user_bus);
4078 flush_close(default_system_bus);
4081 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4082 assert_return(bus, -EINVAL);
4083 assert_return(bus = bus_resolve(bus), -ENOPKG);
4085 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4086 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4087 * from the client side. */
4088 bus->exit_on_disconnect = b;
4090 /* If the exit condition was triggered already, exit immediately. */
4091 return bus_exit_now(bus);
4094 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4095 assert_return(bus, -EINVAL);
4096 assert_return(bus = bus_resolve(bus), -ENOPKG);
4098 return bus->exit_on_disconnect;
4101 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4102 assert_return(bus, -EINVAL);
4103 assert_return(bus = bus_resolve(bus), -ENOPKG);
4104 assert_return(!bus->bus_client, -EPERM);
4105 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4107 return free_and_strdup(&bus->patch_sender, sender);
4110 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4111 assert_return(bus, -EINVAL);
4112 assert_return(bus = bus_resolve(bus), -ENOPKG);
4113 assert_return(ret, -EINVAL);
4115 if (!bus->patch_sender)
4118 *ret = bus->patch_sender;
4122 _public_ int sd_bus_get_n_queued_read(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->rqueue_size;
4132 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4133 assert_return(bus, -EINVAL);
4134 assert_return(bus = bus_resolve(bus), -ENOPKG);
4135 assert_return(!bus_pid_changed(bus), -ECHILD);
4136 assert_return(ret, -EINVAL);
4138 *ret = bus->wqueue_size;