2 This file is part of systemd.
4 Copyright 2013 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 #include "alloc-util.h"
31 #include "bus-container.h"
32 #include "bus-control.h"
33 #include "bus-internal.h"
34 #include "bus-kernel.h"
35 #include "bus-label.h"
36 #include "bus-message.h"
37 #include "bus-objects.h"
38 #include "bus-protocol.h"
40 #include "bus-socket.h"
41 #include "bus-track.h"
44 #include "cgroup-util.h"
47 #include "hexdecoct.h"
48 #include "hostname-util.h"
51 #include "parse-util.h"
52 #include "string-util.h"
56 /// Additional includes needed by elogind
57 #include "process-util.h"
59 #define log_debug_bus_message(m) \
61 sd_bus_message *_mm = (m); \
62 log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error-name=%s error-message=%s", \
63 bus_message_type_to_string(_mm->header->type), \
64 strna(sd_bus_message_get_sender(_mm)), \
65 strna(sd_bus_message_get_destination(_mm)), \
66 strna(sd_bus_message_get_path(_mm)), \
67 strna(sd_bus_message_get_interface(_mm)), \
68 strna(sd_bus_message_get_member(_mm)), \
69 BUS_MESSAGE_COOKIE(_mm), \
71 strna(_mm->error.name), \
72 strna(_mm->error.message)); \
75 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
76 static int attach_io_events(sd_bus *b);
77 static void detach_io_events(sd_bus *b);
79 static thread_local sd_bus *default_system_bus = NULL;
80 #if 0 /// UNNEEDED by elogind
81 static thread_local sd_bus *default_user_bus = NULL;
83 static thread_local sd_bus *default_starter_bus = NULL;
85 static void bus_close_fds(sd_bus *b) {
90 if (b->input_fd != b->output_fd)
91 safe_close(b->output_fd);
92 b->output_fd = b->input_fd = safe_close(b->input_fd);
95 static void bus_reset_queues(sd_bus *b) {
98 while (b->rqueue_size > 0)
99 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
101 b->rqueue = mfree(b->rqueue);
102 b->rqueue_allocated = 0;
104 while (b->wqueue_size > 0)
105 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
107 b->wqueue = mfree(b->wqueue);
108 b->wqueue_allocated = 0;
111 static void bus_free(sd_bus *b) {
115 assert(!b->track_queue);
118 b->state = BUS_CLOSED;
120 sd_bus_detach_event(b);
122 while ((s = b->slots)) {
123 /* At this point only floating slots can still be
124 * around, because the non-floating ones keep a
125 * reference to the bus, and we thus couldn't be
126 * destructing right now... We forcibly disconnect the
127 * slots here, so that they still can be referenced by
128 * apps, but are dead. */
131 bus_slot_disconnect(s);
132 sd_bus_slot_unref(s);
135 if (b->default_bus_ptr)
136 *b->default_bus_ptr = NULL;
142 free(b->unique_name);
143 free(b->auth_buffer);
146 free(b->cgroup_root);
147 free(b->description);
150 strv_free(b->exec_argv);
152 close_many(b->fds, b->n_fds);
157 ordered_hashmap_free_free(b->reply_callbacks);
158 prioq_free(b->reply_callbacks_prioq);
160 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
161 bus_match_free(&b->match_callbacks);
163 hashmap_free_free(b->vtable_methods);
164 hashmap_free_free(b->vtable_properties);
166 assert(hashmap_isempty(b->nodes));
167 hashmap_free(b->nodes);
171 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
176 _public_ int sd_bus_new(sd_bus **ret) {
179 assert_return(ret, -EINVAL);
185 r->n_ref = REFCNT_INIT;
186 r->input_fd = r->output_fd = -1;
187 r->message_version = 1;
188 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
189 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
190 r->attach_flags |= KDBUS_ATTACH_NAMES;
191 r->original_pid = getpid_cached();
193 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
195 /* We guarantee that wqueue always has space for at least one
197 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
206 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
209 assert_return(bus, -EINVAL);
210 assert_return(bus->state == BUS_UNSET, -EPERM);
211 assert_return(address, -EINVAL);
212 assert_return(!bus_pid_changed(bus), -ECHILD);
224 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
225 assert_return(bus, -EINVAL);
226 assert_return(bus->state == BUS_UNSET, -EPERM);
227 assert_return(input_fd >= 0, -EBADF);
228 assert_return(output_fd >= 0, -EBADF);
229 assert_return(!bus_pid_changed(bus), -ECHILD);
231 bus->input_fd = input_fd;
232 bus->output_fd = output_fd;
236 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
239 assert_return(bus, -EINVAL);
240 assert_return(bus->state == BUS_UNSET, -EPERM);
241 assert_return(path, -EINVAL);
242 assert_return(!strv_isempty(argv), -EINVAL);
243 assert_return(!bus_pid_changed(bus), -ECHILD);
255 free(bus->exec_path);
256 strv_free(bus->exec_argv);
264 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
265 assert_return(bus, -EINVAL);
266 assert_return(bus->state == BUS_UNSET, -EPERM);
267 assert_return(!bus_pid_changed(bus), -ECHILD);
269 bus->bus_client = !!b;
273 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
274 assert_return(bus, -EINVAL);
275 assert_return(bus->state == BUS_UNSET, -EPERM);
276 assert_return(!bus_pid_changed(bus), -ECHILD);
278 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
282 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
283 assert_return(bus, -EINVAL);
284 assert_return(bus->state == BUS_UNSET, -EPERM);
285 assert_return(!bus_pid_changed(bus), -ECHILD);
287 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
291 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
293 assert_return(bus, -EINVAL);
294 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
295 assert_return(!bus_pid_changed(bus), -ECHILD);
297 new_flags = bus->attach_flags;
298 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
300 if (bus->attach_flags == new_flags)
303 bus->attach_flags = new_flags;
308 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
311 assert_return(bus, -EINVAL);
312 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
313 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
314 assert_return(!bus_pid_changed(bus), -ECHILD);
316 SET_FLAG(bus->creds_mask, mask, b);
318 /* The well knowns we need unconditionally, so that matches can work */
319 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
321 /* Make sure we don't lose the timestamp flag */
322 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
323 if (bus->attach_flags == new_flags)
326 bus->attach_flags = new_flags;
331 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
332 assert_return(bus, -EINVAL);
333 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
334 assert_return(bus->state == BUS_UNSET, -EPERM);
335 assert_return(!bus_pid_changed(bus), -ECHILD);
337 bus->is_server = !!b;
338 bus->server_id = server_id;
342 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
343 assert_return(bus, -EINVAL);
344 assert_return(bus->state == BUS_UNSET, -EPERM);
345 assert_return(!bus_pid_changed(bus), -ECHILD);
347 bus->anonymous_auth = !!b;
351 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
352 assert_return(bus, -EINVAL);
353 assert_return(bus->state == BUS_UNSET, -EPERM);
354 assert_return(!bus_pid_changed(bus), -ECHILD);
360 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
361 assert_return(bus, -EINVAL);
362 assert_return(bus->state == BUS_UNSET, -EPERM);
363 assert_return(!bus_pid_changed(bus), -ECHILD);
365 return free_and_strdup(&bus->description, description);
368 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
369 assert_return(bus, -EINVAL);
370 assert_return(!bus_pid_changed(bus), -ECHILD);
372 bus->allow_interactive_authorization = !!b;
376 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
377 assert_return(bus, -EINVAL);
378 assert_return(!bus_pid_changed(bus), -ECHILD);
380 return bus->allow_interactive_authorization;
383 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
391 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
393 r = sd_bus_message_get_errno(reply);
397 r = sd_bus_message_read(reply, "s", &s);
401 if (!service_name_is_valid(s) || s[0] != ':')
404 bus->unique_name = strdup(s);
405 if (!bus->unique_name)
408 if (bus->state == BUS_HELLO)
409 bus->state = BUS_RUNNING;
414 static int bus_send_hello(sd_bus *bus) {
415 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
420 if (!bus->bus_client)
423 r = sd_bus_message_new_method_call(
426 "org.freedesktop.DBus",
427 "/org/freedesktop/DBus",
428 "org.freedesktop.DBus",
433 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
436 int bus_start_running(sd_bus *bus) {
439 if (bus->bus_client) {
440 bus->state = BUS_HELLO;
444 bus->state = BUS_RUNNING;
448 static int parse_address_key(const char **p, const char *key, char **value) {
449 size_t l, n = 0, allocated = 0;
459 if (strncmp(*p, key, l) != 0)
472 while (!IN_SET(*a, ';', ',', 0)) {
490 c = (char) ((x << 4) | y);
497 if (!GREEDY_REALLOC(r, allocated, n + 2))
521 static void skip_address_key(const char **p) {
525 *p += strcspn(*p, ",");
531 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
532 _cleanup_free_ char *path = NULL, *abstract = NULL;
541 while (!IN_SET(**p, 0, ';')) {
542 r = parse_address_key(p, "guid", guid);
548 r = parse_address_key(p, "path", &path);
554 r = parse_address_key(p, "abstract", &abstract);
563 if (!path && !abstract)
566 if (path && abstract)
571 if (l > sizeof(b->sockaddr.un.sun_path))
574 b->sockaddr.un.sun_family = AF_UNIX;
575 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
576 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
577 } else if (abstract) {
578 l = strlen(abstract);
579 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
582 b->sockaddr.un.sun_family = AF_UNIX;
583 b->sockaddr.un.sun_path[0] = 0;
584 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
585 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
593 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
594 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
596 struct addrinfo *result, hints = {
597 .ai_socktype = SOCK_STREAM,
598 .ai_flags = AI_ADDRCONFIG,
606 while (!IN_SET(**p, 0, ';')) {
607 r = parse_address_key(p, "guid", guid);
613 r = parse_address_key(p, "host", &host);
619 r = parse_address_key(p, "port", &port);
625 r = parse_address_key(p, "family", &family);
638 if (streq(family, "ipv4"))
639 hints.ai_family = AF_INET;
640 else if (streq(family, "ipv6"))
641 hints.ai_family = AF_INET6;
646 r = getaddrinfo(host, port, &hints, &result);
650 return -EADDRNOTAVAIL;
652 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
653 b->sockaddr_size = result->ai_addrlen;
655 freeaddrinfo(result);
662 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
664 unsigned n_argv = 0, j;
666 size_t allocated = 0;
674 while (!IN_SET(**p, 0, ';')) {
675 r = parse_address_key(p, "guid", guid);
681 r = parse_address_key(p, "path", &path);
687 if (startswith(*p, "argv")) {
691 ul = strtoul(*p + 4, (char**) p, 10);
692 if (errno > 0 || **p != '=' || ul > 256) {
700 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
708 r = parse_address_key(p, NULL, argv + ul);
723 /* Make sure there are no holes in the array, with the
724 * exception of argv[0] */
725 for (j = 1; j < n_argv; j++)
731 if (argv && argv[0] == NULL) {
732 argv[0] = strdup(path);
747 for (j = 0; j < n_argv; j++)
755 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
756 _cleanup_free_ char *machine = NULL, *pid = NULL;
764 while (!IN_SET(**p, 0, ';')) {
765 r = parse_address_key(p, "guid", guid);
771 r = parse_address_key(p, "machine", &machine);
777 r = parse_address_key(p, "pid", &pid);
786 if (!machine == !pid)
790 if (!machine_name_is_valid(machine))
794 b->machine = machine;
797 b->machine = mfree(b->machine);
801 r = parse_pid(pid, &b->nspid);
807 b->sockaddr.un.sun_family = AF_UNIX;
808 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
809 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
815 static void bus_reset_parsed_address(sd_bus *b) {
819 b->sockaddr_size = 0;
820 b->exec_argv = strv_free(b->exec_argv);
821 b->exec_path = mfree(b->exec_path);
822 b->server_id = SD_ID128_NULL;
823 b->machine = mfree(b->machine);
827 static int bus_parse_next_address(sd_bus *b) {
828 _cleanup_free_ char *guid = NULL;
836 if (b->address[b->address_index] == 0)
839 bus_reset_parsed_address(b);
841 a = b->address + b->address_index;
850 if (startswith(a, "unix:")) {
853 r = parse_unix_address(b, &a, &guid);
858 } else if (startswith(a, "tcp:")) {
861 r = parse_tcp_address(b, &a, &guid);
867 } else if (startswith(a, "unixexec:")) {
870 r = parse_exec_address(b, &a, &guid);
876 } else if (startswith(a, "x-machine-unix:")) {
879 r = parse_container_unix_address(b, &a, &guid);
892 r = sd_id128_from_string(guid, &b->server_id);
897 b->address_index = a - b->address;
901 static int bus_start_address(sd_bus *b) {
909 /* If you provide multiple different bus-addresses, we
910 * try all of them in order and use the first one that
914 r = bus_socket_exec(b);
916 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
917 r = bus_container_connect_socket(b);
919 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
920 r = bus_socket_connect(b);
926 r = attach_io_events(b);
931 b->last_connect_error = -r;
934 r = bus_parse_next_address(b);
938 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
942 int bus_next_address(sd_bus *b) {
945 bus_reset_parsed_address(b);
946 return bus_start_address(b);
949 static int bus_start_fd(sd_bus *b) {
954 assert(b->input_fd >= 0);
955 assert(b->output_fd >= 0);
957 r = fd_nonblock(b->input_fd, true);
961 r = fd_cloexec(b->input_fd, true);
965 if (b->input_fd != b->output_fd) {
966 r = fd_nonblock(b->output_fd, true);
970 r = fd_cloexec(b->output_fd, true);
975 if (fstat(b->input_fd, &st) < 0)
978 return bus_socket_take_fd(b);
981 _public_ int sd_bus_start(sd_bus *bus) {
984 assert_return(bus, -EINVAL);
985 assert_return(bus->state == BUS_UNSET, -EPERM);
986 assert_return(!bus_pid_changed(bus), -ECHILD);
988 bus->state = BUS_OPENING;
990 if (bus->is_server && bus->bus_client)
993 if (bus->input_fd >= 0)
994 r = bus_start_fd(bus);
995 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
996 r = bus_start_address(bus);
1005 return bus_send_hello(bus);
1008 _public_ int sd_bus_open(sd_bus **ret) {
1013 assert_return(ret, -EINVAL);
1015 /* Let's connect to the starter bus if it is set, and
1016 * otherwise to the bus that is appropropriate for the scope
1017 * we are running in */
1019 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1021 if (streq(e, "system"))
1022 return sd_bus_open_system(ret);
1023 #if 0 /// elogind does not support systemd units
1024 else if (STR_IN_SET(e, "session", "user"))
1025 return sd_bus_open_user(ret);
1029 e = secure_getenv("DBUS_STARTER_ADDRESS");
1031 #if 0 /// elogind does not support systemd units
1032 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1033 return sd_bus_open_user(ret);
1036 return sd_bus_open_system(ret);
1043 r = sd_bus_set_address(b, e);
1047 b->bus_client = true;
1049 /* We don't know whether the bus is trusted or not, so better
1050 * be safe, and authenticate everything */
1052 b->is_local = false;
1053 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1054 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1056 r = sd_bus_start(b);
1068 int bus_set_address_system(sd_bus *b) {
1072 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1074 return sd_bus_set_address(b, e);
1076 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1079 _public_ int sd_bus_open_system(sd_bus **ret) {
1083 assert_return(ret, -EINVAL);
1089 r = bus_set_address_system(b);
1093 b->bus_client = true;
1094 b->is_system = true;
1096 /* Let's do per-method access control on the system bus. We
1097 * need the caller's UID and capability set for that. */
1099 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1100 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1103 r = sd_bus_start(b);
1115 #if 0 /// elogind can not open/use a user bus
1116 int bus_set_address_user(sd_bus *b) {
1118 _cleanup_free_ char *ee = NULL, *s = NULL;
1122 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1124 return sd_bus_set_address(b, e);
1126 e = secure_getenv("XDG_RUNTIME_DIR");
1130 ee = bus_address_escape(e);
1134 if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, ee) < 0)
1144 _public_ int sd_bus_open_user(sd_bus **ret) {
1145 #if 0 /// elogind does not support user buses
1149 assert_return(ret, -EINVAL);
1155 r = bus_set_address_user(b);
1159 b->bus_client = true;
1162 /* We don't do any per-method access control on the user
1167 r = sd_bus_start(b);
1178 return sd_bus_open_system(ret);
1182 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1183 _cleanup_free_ char *e = NULL;
1184 char *m = NULL, *c = NULL;
1189 /* Let's see if we shall enter some container */
1190 m = strchr(host, ':');
1194 /* Let's make sure this is not a port of some kind,
1195 * and is a valid machine name. */
1196 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1199 /* Cut out the host part */
1200 t = strndupa(host, m - host - 1);
1201 e = bus_address_escape(t);
1205 c = strjoina(",argv5=--machine=", m);
1210 e = bus_address_escape(host);
1215 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=systemd-stdio-bridge", c);
1222 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1226 assert_return(host, -EINVAL);
1227 assert_return(ret, -EINVAL);
1229 r = sd_bus_new(&bus);
1233 r = bus_set_address_system_remote(bus, host);
1237 bus->bus_client = true;
1238 bus->trusted = false;
1239 bus->is_system = true;
1240 bus->is_local = false;
1242 r = sd_bus_start(bus);
1254 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1255 _cleanup_free_ char *e = NULL;
1260 e = bus_address_escape(machine);
1264 b->address = strjoin("x-machine-unix:machine=", e);
1271 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1275 assert_return(machine, -EINVAL);
1276 assert_return(ret, -EINVAL);
1277 assert_return(machine_name_is_valid(machine), -EINVAL);
1279 r = sd_bus_new(&bus);
1283 r = bus_set_address_system_machine(bus, machine);
1287 bus->bus_client = true;
1288 bus->trusted = false;
1289 bus->is_system = true;
1290 bus->is_local = false;
1292 r = sd_bus_start(bus);
1304 _public_ void sd_bus_close(sd_bus *bus) {
1308 if (bus->state == BUS_CLOSED)
1310 if (bus_pid_changed(bus))
1313 bus->state = BUS_CLOSED;
1315 sd_bus_detach_event(bus);
1317 /* Drop all queued messages so that they drop references to
1318 * the bus object and the bus may be freed */
1319 bus_reset_queues(bus);
1324 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1332 return sd_bus_unref(bus);
1335 static void bus_enter_closing(sd_bus *bus) {
1338 if (!IN_SET(bus->state, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1341 bus->state = BUS_CLOSING;
1344 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1349 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1354 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1360 i = REFCNT_DEC(bus->n_ref);
1368 _public_ int sd_bus_is_open(sd_bus *bus) {
1370 assert_return(bus, -EINVAL);
1371 assert_return(!bus_pid_changed(bus), -ECHILD);
1373 return BUS_IS_OPEN(bus->state);
1376 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1379 assert_return(bus, -EINVAL);
1380 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1381 assert_return(!bus_pid_changed(bus), -ECHILD);
1383 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1386 if (type == SD_BUS_TYPE_UNIX_FD) {
1387 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1390 r = bus_ensure_running(bus);
1394 return bus->can_fds;
1397 return bus_type_is_valid(type);
1400 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1403 assert_return(bus, -EINVAL);
1404 assert_return(id, -EINVAL);
1405 assert_return(!bus_pid_changed(bus), -ECHILD);
1407 r = bus_ensure_running(bus);
1411 *id = bus->server_id;
1415 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1420 /* If we copy the same message to multiple
1421 * destinations, avoid using the same cookie
1423 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1428 timeout = BUS_DEFAULT_TIMEOUT;
1430 return bus_message_seal(m, ++b->cookie, timeout);
1433 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1434 bool remarshal = false;
1438 /* wrong packet version */
1439 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1442 /* wrong packet endianness */
1443 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1446 return remarshal ? bus_message_remarshal(b, m) : 0;
1449 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1453 /* Fake some timestamps, if they were requested, and not
1454 * already initialized */
1455 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1456 if (m->realtime <= 0)
1457 m->realtime = now(CLOCK_REALTIME);
1459 if (m->monotonic <= 0)
1460 m->monotonic = now(CLOCK_MONOTONIC);
1463 /* The bus specification says the serial number cannot be 0,
1464 * hence let's fill something in for synthetic messages. Since
1465 * synthetic messages might have a fake sender and we don't
1466 * want to interfere with the real sender's serial numbers we
1467 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1468 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1469 * even though kdbus can do 64bit. */
1470 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1473 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1479 r = bus_socket_write_message(bus, m, idx);
1483 if (*idx >= BUS_MESSAGE_SIZE(m))
1484 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error-name=%s error-message=%s",
1485 bus_message_type_to_string(m->header->type),
1486 strna(sd_bus_message_get_sender(m)),
1487 strna(sd_bus_message_get_destination(m)),
1488 strna(sd_bus_message_get_path(m)),
1489 strna(sd_bus_message_get_interface(m)),
1490 strna(sd_bus_message_get_member(m)),
1491 BUS_MESSAGE_COOKIE(m),
1493 strna(m->error.name),
1494 strna(m->error.message));
1499 static int dispatch_wqueue(sd_bus *bus) {
1503 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1505 while (bus->wqueue_size > 0) {
1507 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1511 /* Didn't do anything this time */
1513 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1514 /* Fully written. Let's drop the entry from
1517 * This isn't particularly optimized, but
1518 * well, this is supposed to be our worst-case
1519 * buffer only, and the socket buffer is
1520 * supposed to be our primary buffer, and if
1521 * it got full, then all bets are off
1525 sd_bus_message_unref(bus->wqueue[0]);
1526 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1536 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1539 return bus_socket_read_message(bus);
1542 int bus_rqueue_make_room(sd_bus *bus) {
1545 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1548 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1554 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1559 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1561 /* Note that the priority logic is only available on kdbus,
1562 * where the rqueue is unused. We check the rqueue here
1563 * anyway, because it's simple... */
1566 if (bus->rqueue_size > 0) {
1567 /* Dispatch a queued message */
1569 *m = bus->rqueue[0];
1571 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1575 /* Try to read a new message */
1576 r = bus_read_message(bus, hint_priority, priority);
1586 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1587 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1590 assert_return(m, -EINVAL);
1595 assert_return(!bus_pid_changed(bus), -ECHILD);
1597 if (!BUS_IS_OPEN(bus->state))
1601 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1608 /* If the cookie number isn't kept, then we know that no reply
1610 if (!cookie && !m->sealed)
1611 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1613 r = bus_seal_message(bus, m, 0);
1617 /* Remarshall if we have to. This will possibly unref the
1618 * message and place a replacement in m */
1619 r = bus_remarshal_message(bus, &m);
1623 /* If this is a reply and no reply was requested, then let's
1624 * suppress this, if we can */
1628 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1631 r = bus_write_message(bus, m, hint_sync_call, &idx);
1633 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1634 bus_enter_closing(bus);
1641 if (idx < BUS_MESSAGE_SIZE(m)) {
1642 /* Wasn't fully written. So let's remember how
1643 * much was written. Note that the first entry
1644 * of the wqueue array is always allocated so
1645 * that we always can remember how much was
1647 bus->wqueue[0] = sd_bus_message_ref(m);
1648 bus->wqueue_size = 1;
1653 /* Just append it to the queue. */
1655 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1658 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1661 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1666 *cookie = BUS_MESSAGE_COOKIE(m);
1671 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1672 return bus_send_internal(bus, m, cookie, false);
1675 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1678 assert_return(m, -EINVAL);
1683 assert_return(!bus_pid_changed(bus), -ECHILD);
1685 if (!BUS_IS_OPEN(bus->state))
1688 if (!streq_ptr(m->destination, destination)) {
1693 r = sd_bus_message_set_destination(m, destination);
1698 return sd_bus_send(bus, m, cookie);
1701 static usec_t calc_elapse(uint64_t usec) {
1702 if (usec == (uint64_t) -1)
1705 return now(CLOCK_MONOTONIC) + usec;
1708 static int timeout_compare(const void *a, const void *b) {
1709 const struct reply_callback *x = a, *y = b;
1711 if (x->timeout != 0 && y->timeout == 0)
1714 if (x->timeout == 0 && y->timeout != 0)
1717 if (x->timeout < y->timeout)
1720 if (x->timeout > y->timeout)
1726 _public_ int sd_bus_call_async(
1730 sd_bus_message_handler_t callback,
1734 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1735 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1738 assert_return(m, -EINVAL);
1739 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1740 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1741 assert_return(callback, -EINVAL);
1746 assert_return(!bus_pid_changed(bus), -ECHILD);
1748 if (!BUS_IS_OPEN(bus->state))
1751 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1755 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1759 r = bus_seal_message(bus, m, usec);
1763 r = bus_remarshal_message(bus, &m);
1767 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1771 s->reply_callback.callback = callback;
1773 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1774 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1776 s->reply_callback.cookie = 0;
1780 s->reply_callback.timeout = calc_elapse(m->timeout);
1781 if (s->reply_callback.timeout != 0) {
1782 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1784 s->reply_callback.timeout = 0;
1789 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1800 int bus_ensure_running(sd_bus *bus) {
1805 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
1807 if (bus->state == BUS_RUNNING)
1811 r = sd_bus_process(bus, NULL);
1814 if (bus->state == BUS_RUNNING)
1819 r = sd_bus_wait(bus, (uint64_t) -1);
1825 _public_ int sd_bus_call(
1829 sd_bus_error *error,
1830 sd_bus_message **reply) {
1832 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1838 bus_assert_return(m, -EINVAL, error);
1839 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
1840 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
1841 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
1846 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
1848 if (!BUS_IS_OPEN(bus->state)) {
1853 r = bus_ensure_running(bus);
1857 i = bus->rqueue_size;
1859 r = bus_seal_message(bus, m, usec);
1863 r = bus_remarshal_message(bus, &m);
1867 r = bus_send_internal(bus, m, &cookie, true);
1871 timeout = calc_elapse(m->timeout);
1876 while (i < bus->rqueue_size) {
1877 sd_bus_message *incoming = NULL;
1879 incoming = bus->rqueue[i];
1881 if (incoming->reply_cookie == cookie) {
1882 /* Found a match! */
1884 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1886 log_debug_bus_message(incoming);
1888 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
1890 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
1894 sd_bus_message_unref(incoming);
1899 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
1900 sd_bus_message_unref(incoming);
1903 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
1904 r = sd_bus_error_copy(error, &incoming->error);
1905 sd_bus_message_unref(incoming);
1912 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
1915 streq(bus->unique_name, incoming->sender)) {
1917 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1920 /* Our own message? Somebody is trying
1921 * to send its own client a message,
1922 * let's not dead-lock, let's fail
1925 sd_bus_message_unref(incoming);
1930 /* Try to read more, right-away */
1934 r = bus_read_message(bus, false, 0);
1936 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1937 bus_enter_closing(bus);
1949 n = now(CLOCK_MONOTONIC);
1957 left = (uint64_t) -1;
1959 r = bus_poll(bus, true, left);
1967 r = dispatch_wqueue(bus);
1969 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1970 bus_enter_closing(bus);
1979 return sd_bus_error_set_errno(error, r);
1982 _public_ int sd_bus_get_fd(sd_bus *bus) {
1984 assert_return(bus, -EINVAL);
1985 assert_return(bus->input_fd == bus->output_fd, -EPERM);
1986 assert_return(!bus_pid_changed(bus), -ECHILD);
1988 return bus->input_fd;
1991 _public_ int sd_bus_get_events(sd_bus *bus) {
1994 assert_return(bus, -EINVAL);
1995 assert_return(!bus_pid_changed(bus), -ECHILD);
1997 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2000 if (bus->state == BUS_OPENING)
2002 else if (bus->state == BUS_AUTHENTICATING) {
2004 if (bus_socket_auth_needs_write(bus))
2009 } else if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)) {
2010 if (bus->rqueue_size <= 0)
2012 if (bus->wqueue_size > 0)
2019 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2020 struct reply_callback *c;
2022 assert_return(bus, -EINVAL);
2023 assert_return(timeout_usec, -EINVAL);
2024 assert_return(!bus_pid_changed(bus), -ECHILD);
2026 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2029 if (bus->track_queue) {
2034 if (bus->state == BUS_CLOSING) {
2039 if (bus->state == BUS_AUTHENTICATING) {
2040 *timeout_usec = bus->auth_timeout;
2044 if (!IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)) {
2045 *timeout_usec = (uint64_t) -1;
2049 if (bus->rqueue_size > 0) {
2054 c = prioq_peek(bus->reply_callbacks_prioq);
2056 *timeout_usec = (uint64_t) -1;
2060 if (c->timeout == 0) {
2061 *timeout_usec = (uint64_t) -1;
2065 *timeout_usec = c->timeout;
2069 static int process_timeout(sd_bus *bus) {
2070 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2071 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2072 struct reply_callback *c;
2079 c = prioq_peek(bus->reply_callbacks_prioq);
2083 n = now(CLOCK_MONOTONIC);
2087 r = bus_message_new_synthetic_error(
2090 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2095 r = bus_seal_synthetic_message(bus, m);
2099 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2102 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2105 slot = container_of(c, sd_bus_slot, reply_callback);
2107 bus->iteration_counter++;
2109 bus->current_message = m;
2110 bus->current_slot = sd_bus_slot_ref(slot);
2111 bus->current_handler = c->callback;
2112 bus->current_userdata = slot->userdata;
2113 r = c->callback(m, slot->userdata, &error_buffer);
2114 bus->current_userdata = NULL;
2115 bus->current_handler = NULL;
2116 bus->current_slot = NULL;
2117 bus->current_message = NULL;
2119 if (slot->floating) {
2120 bus_slot_disconnect(slot);
2121 sd_bus_slot_unref(slot);
2124 sd_bus_slot_unref(slot);
2126 return bus_maybe_reply_error(m, r, &error_buffer);
2129 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2133 if (bus->state != BUS_HELLO)
2136 /* Let's make sure the first message on the bus is the HELLO
2137 * reply. But note that we don't actually parse the message
2138 * here (we leave that to the usual handling), we just verify
2139 * we don't let any earlier msg through. */
2141 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2144 if (m->reply_cookie != 1)
2150 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2151 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2152 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2153 struct reply_callback *c;
2160 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2163 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2166 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2172 slot = container_of(c, sd_bus_slot, reply_callback);
2174 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2176 /* If the reply contained a file descriptor which we
2177 * didn't want we pass an error instead. */
2179 r = bus_message_new_synthetic_error(
2182 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2187 /* Copy over original timestamp */
2188 synthetic_reply->realtime = m->realtime;
2189 synthetic_reply->monotonic = m->monotonic;
2190 synthetic_reply->seqnum = m->seqnum;
2192 r = bus_seal_synthetic_message(bus, synthetic_reply);
2196 m = synthetic_reply;
2198 r = sd_bus_message_rewind(m, true);
2203 if (c->timeout != 0) {
2204 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2208 bus->current_slot = sd_bus_slot_ref(slot);
2209 bus->current_handler = c->callback;
2210 bus->current_userdata = slot->userdata;
2211 r = c->callback(m, slot->userdata, &error_buffer);
2212 bus->current_userdata = NULL;
2213 bus->current_handler = NULL;
2214 bus->current_slot = NULL;
2216 if (slot->floating) {
2217 bus_slot_disconnect(slot);
2218 sd_bus_slot_unref(slot);
2221 sd_bus_slot_unref(slot);
2223 return bus_maybe_reply_error(m, r, &error_buffer);
2226 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2227 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2228 struct filter_callback *l;
2235 bus->filter_callbacks_modified = false;
2237 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2240 if (bus->filter_callbacks_modified)
2243 /* Don't run this more than once per iteration */
2244 if (l->last_iteration == bus->iteration_counter)
2247 l->last_iteration = bus->iteration_counter;
2249 r = sd_bus_message_rewind(m, true);
2253 slot = container_of(l, sd_bus_slot, filter_callback);
2255 bus->current_slot = sd_bus_slot_ref(slot);
2256 bus->current_handler = l->callback;
2257 bus->current_userdata = slot->userdata;
2258 r = l->callback(m, slot->userdata, &error_buffer);
2259 bus->current_userdata = NULL;
2260 bus->current_handler = NULL;
2261 bus->current_slot = sd_bus_slot_unref(slot);
2263 r = bus_maybe_reply_error(m, r, &error_buffer);
2269 } while (bus->filter_callbacks_modified);
2274 static int process_match(sd_bus *bus, sd_bus_message *m) {
2281 bus->match_callbacks_modified = false;
2283 r = bus_match_run(bus, &bus->match_callbacks, m);
2287 } while (bus->match_callbacks_modified);
2292 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2293 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2299 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2302 if (bus->manual_peer_interface)
2305 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2308 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2311 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2314 if (streq_ptr(m->member, "Ping"))
2315 r = sd_bus_message_new_method_return(m, &reply);
2316 else if (streq_ptr(m->member, "GetMachineId")) {
2320 r = sd_id128_get_machine(&id);
2324 r = sd_bus_message_new_method_return(m, &reply);
2328 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2330 r = sd_bus_message_new_method_errorf(
2332 SD_BUS_ERROR_UNKNOWN_METHOD,
2333 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2339 r = sd_bus_send(bus, reply, NULL);
2346 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2350 /* If we got a message with a file descriptor which we didn't
2351 * want to accept, then let's drop it. How can this even
2352 * happen? For example, when the kernel queues a message into
2353 * an activatable names's queue which allows fds, and then is
2354 * delivered to us later even though we ourselves did not
2357 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2363 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2366 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2367 return 1; /* just eat it up */
2369 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2372 static int process_message(sd_bus *bus, sd_bus_message *m) {
2378 bus->current_message = m;
2379 bus->iteration_counter++;
2381 log_debug_bus_message(m);
2383 r = process_hello(bus, m);
2387 r = process_reply(bus, m);
2391 r = process_fd_check(bus, m);
2395 r = process_filter(bus, m);
2399 r = process_match(bus, m);
2403 r = process_builtin(bus, m);
2407 r = bus_process_object(bus, m);
2410 bus->current_message = NULL;
2414 static int dispatch_track(sd_bus *bus) {
2417 if (!bus->track_queue)
2420 bus_track_dispatch(bus->track_queue);
2424 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2425 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2429 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2431 r = process_timeout(bus);
2435 r = dispatch_wqueue(bus);
2439 r = dispatch_track(bus);
2443 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2449 r = process_message(bus, m);
2454 r = sd_bus_message_rewind(m, true);
2463 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2465 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2466 strna(sd_bus_message_get_sender(m)),
2467 strna(sd_bus_message_get_path(m)),
2468 strna(sd_bus_message_get_interface(m)),
2469 strna(sd_bus_message_get_member(m)));
2471 r = sd_bus_reply_method_errorf(
2473 SD_BUS_ERROR_UNKNOWN_OBJECT,
2474 "Unknown object '%s'.", m->path);
2488 static int bus_exit_now(sd_bus *bus) {
2491 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2492 * sd_event_exit(), otherwise invokes libc exit(). */
2494 if (bus->exited) /* did we already exit? */
2496 if (!bus->exit_triggered) /* was the exit condition triggered? */
2498 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2501 bus->exited = true; /* never exit more than once */
2503 log_debug("Bus connection disconnected, exiting.");
2506 return sd_event_exit(bus->event, EXIT_FAILURE);
2510 assert_not_reached("exit() didn't exit?");
2513 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2514 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2515 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2522 r = bus_message_new_synthetic_error(
2525 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2530 r = bus_seal_synthetic_message(bus, m);
2534 if (c->timeout != 0) {
2535 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2539 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2542 slot = container_of(c, sd_bus_slot, reply_callback);
2544 bus->iteration_counter++;
2546 bus->current_message = m;
2547 bus->current_slot = sd_bus_slot_ref(slot);
2548 bus->current_handler = c->callback;
2549 bus->current_userdata = slot->userdata;
2550 r = c->callback(m, slot->userdata, &error_buffer);
2551 bus->current_userdata = NULL;
2552 bus->current_handler = NULL;
2553 bus->current_slot = NULL;
2554 bus->current_message = NULL;
2556 if (slot->floating) {
2557 bus_slot_disconnect(slot);
2558 sd_bus_slot_unref(slot);
2561 sd_bus_slot_unref(slot);
2563 return bus_maybe_reply_error(m, r, &error_buffer);
2566 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2567 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2568 struct reply_callback *c;
2572 assert(bus->state == BUS_CLOSING);
2574 /* First, fail all outstanding method calls */
2575 c = ordered_hashmap_first(bus->reply_callbacks);
2577 return process_closing_reply_callback(bus, c);
2579 /* Then, fake-drop all remaining bus tracking references */
2581 bus_track_close(bus->tracks);
2585 /* Then, synthesize a Disconnected message */
2586 r = sd_bus_message_new_signal(
2589 "/org/freedesktop/DBus/Local",
2590 "org.freedesktop.DBus.Local",
2595 bus_message_set_sender_local(bus, m);
2597 r = bus_seal_synthetic_message(bus, m);
2603 bus->current_message = m;
2604 bus->iteration_counter++;
2606 r = process_filter(bus, m);
2610 r = process_match(bus, m);
2614 /* Nothing else to do, exit now, if the condition holds */
2615 bus->exit_triggered = true;
2616 (void) bus_exit_now(bus);
2626 bus->current_message = NULL;
2631 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2632 BUS_DONT_DESTROY(bus);
2635 /* Returns 0 when we didn't do anything. This should cause the
2636 * caller to invoke sd_bus_wait() before returning the next
2637 * time. Returns > 0 when we did something, which possibly
2638 * means *ret is filled in with an unprocessed message. */
2640 assert_return(bus, -EINVAL);
2641 assert_return(!bus_pid_changed(bus), -ECHILD);
2643 /* We don't allow recursively invoking sd_bus_process(). */
2644 assert_return(!bus->current_message, -EBUSY);
2645 assert(!bus->current_slot);
2647 switch (bus->state) {
2656 r = bus_socket_process_opening(bus);
2657 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2658 bus_enter_closing(bus);
2666 case BUS_AUTHENTICATING:
2667 r = bus_socket_process_authenticating(bus);
2668 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2669 bus_enter_closing(bus);
2681 r = process_running(bus, hint_priority, priority, ret);
2682 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2683 bus_enter_closing(bus);
2693 return process_closing(bus, ret);
2696 assert_not_reached("Unknown state");
2699 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2700 return bus_process_internal(bus, false, 0, ret);
2703 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2704 return bus_process_internal(bus, true, priority, ret);
2707 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2708 struct pollfd p[2] = {};
2711 usec_t m = USEC_INFINITY;
2715 if (bus->state == BUS_CLOSING)
2718 if (!BUS_IS_OPEN(bus->state))
2721 e = sd_bus_get_events(bus);
2726 /* The caller really needs some more data, he doesn't
2727 * care about what's already read, or any timeouts
2728 * except its own. */
2732 /* The caller wants to process if there's something to
2733 * process, but doesn't care otherwise */
2735 r = sd_bus_get_timeout(bus, &until);
2740 nw = now(CLOCK_MONOTONIC);
2741 m = until > nw ? until - nw : 0;
2745 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2748 p[0].fd = bus->input_fd;
2749 if (bus->output_fd == bus->input_fd) {
2753 p[0].events = e & POLLIN;
2754 p[1].fd = bus->output_fd;
2755 p[1].events = e & POLLOUT;
2759 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2763 return r > 0 ? 1 : 0;
2766 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2768 assert_return(bus, -EINVAL);
2769 assert_return(!bus_pid_changed(bus), -ECHILD);
2771 if (bus->state == BUS_CLOSING)
2774 if (!BUS_IS_OPEN(bus->state))
2777 if (bus->rqueue_size > 0)
2780 return bus_poll(bus, false, timeout_usec);
2783 _public_ int sd_bus_flush(sd_bus *bus) {
2786 assert_return(bus, -EINVAL);
2787 assert_return(!bus_pid_changed(bus), -ECHILD);
2789 if (bus->state == BUS_CLOSING)
2792 if (!BUS_IS_OPEN(bus->state))
2795 r = bus_ensure_running(bus);
2799 if (bus->wqueue_size <= 0)
2803 r = dispatch_wqueue(bus);
2805 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2806 bus_enter_closing(bus);
2813 if (bus->wqueue_size <= 0)
2816 r = bus_poll(bus, false, (uint64_t) -1);
2822 _public_ int sd_bus_add_filter(
2825 sd_bus_message_handler_t callback,
2830 assert_return(bus, -EINVAL);
2831 assert_return(callback, -EINVAL);
2832 assert_return(!bus_pid_changed(bus), -ECHILD);
2834 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
2838 s->filter_callback.callback = callback;
2840 bus->filter_callbacks_modified = true;
2841 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
2849 _public_ int sd_bus_add_match(
2853 sd_bus_message_handler_t callback,
2856 struct bus_match_component *components = NULL;
2857 unsigned n_components = 0;
2858 sd_bus_slot *s = NULL;
2861 assert_return(bus, -EINVAL);
2862 assert_return(match, -EINVAL);
2863 assert_return(!bus_pid_changed(bus), -ECHILD);
2865 r = bus_match_parse(match, &components, &n_components);
2869 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
2875 s->match_callback.callback = callback;
2877 if (bus->bus_client) {
2878 enum bus_match_scope scope;
2880 scope = bus_match_get_scope(components, n_components);
2882 /* Do not install server-side matches for matches
2883 * against the local service, interface or bus path. */
2884 if (scope != BUS_MATCH_LOCAL) {
2886 /* We store the original match string, so that
2887 * we can use it to remove the match again. */
2889 s->match_callback.match_string = strdup(match);
2890 if (!s->match_callback.match_string) {
2895 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components);
2899 s->match_added = true;
2903 bus->match_callbacks_modified = true;
2904 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
2913 bus_match_parse_free(components, n_components);
2914 sd_bus_slot_unref(s);
2919 #if 0 /// UNNEEDED by elogind
2920 int bus_remove_match_by_string(
2923 sd_bus_message_handler_t callback,
2926 struct bus_match_component *components = NULL;
2927 unsigned n_components = 0;
2928 struct match_callback *c;
2931 assert_return(bus, -EINVAL);
2932 assert_return(match, -EINVAL);
2933 assert_return(!bus_pid_changed(bus), -ECHILD);
2935 r = bus_match_parse(match, &components, &n_components);
2939 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
2943 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
2946 bus_match_parse_free(components, n_components);
2952 bool bus_pid_changed(sd_bus *bus) {
2955 /* We don't support people creating a bus connection and
2956 * keeping it around over a fork(). Let's complain. */
2958 return bus->original_pid != getpid_cached();
2961 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
2962 sd_bus *bus = userdata;
2967 r = sd_bus_process(bus, NULL);
2974 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
2975 sd_bus *bus = userdata;
2980 r = sd_bus_process(bus, NULL);
2987 static int prepare_callback(sd_event_source *s, void *userdata) {
2988 sd_bus *bus = userdata;
2995 e = sd_bus_get_events(bus);
2999 if (bus->output_fd != bus->input_fd) {
3001 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3005 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3009 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3014 r = sd_bus_get_timeout(bus, &until);
3020 j = sd_event_source_set_time(bus->time_event_source, until);
3025 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3032 static int quit_callback(sd_event_source *event, void *userdata) {
3033 sd_bus *bus = userdata;
3043 static int attach_io_events(sd_bus *bus) {
3048 if (bus->input_fd < 0)
3054 if (!bus->input_io_event_source) {
3055 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3059 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3063 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3067 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3069 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3074 if (bus->output_fd != bus->input_fd) {
3075 assert(bus->output_fd >= 0);
3077 if (!bus->output_io_event_source) {
3078 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3082 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3086 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3088 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3097 static void detach_io_events(sd_bus *bus) {
3100 if (bus->input_io_event_source) {
3101 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3102 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3105 if (bus->output_io_event_source) {
3106 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3107 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3111 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3114 assert_return(bus, -EINVAL);
3115 assert_return(!bus->event, -EBUSY);
3117 assert(!bus->input_io_event_source);
3118 assert(!bus->output_io_event_source);
3119 assert(!bus->time_event_source);
3122 bus->event = sd_event_ref(event);
3124 r = sd_event_default(&bus->event);
3129 bus->event_priority = priority;
3131 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3135 r = sd_event_source_set_priority(bus->time_event_source, priority);
3139 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3143 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3147 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3151 r = attach_io_events(bus);
3158 sd_bus_detach_event(bus);
3162 _public_ int sd_bus_detach_event(sd_bus *bus) {
3163 assert_return(bus, -EINVAL);
3168 detach_io_events(bus);
3170 if (bus->time_event_source) {
3171 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3172 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3175 if (bus->quit_event_source) {
3176 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3177 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3180 bus->event = sd_event_unref(bus->event);
3184 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3185 assert_return(bus, NULL);
3190 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3191 assert_return(bus, NULL);
3193 return bus->current_message;
3196 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3197 assert_return(bus, NULL);
3199 return bus->current_slot;
3202 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3203 assert_return(bus, NULL);
3205 return bus->current_handler;
3208 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3209 assert_return(bus, NULL);
3211 return bus->current_userdata;
3214 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3219 assert(default_bus);
3222 return !!*default_bus;
3225 *ret = sd_bus_ref(*default_bus);
3233 b->default_bus_ptr = default_bus;
3241 _public_ int sd_bus_default_system(sd_bus **ret) {
3242 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3246 _public_ int sd_bus_default_user(sd_bus **ret) {
3247 #if 0 /// elogind does not support user buses
3248 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3250 return sd_bus_default_system(ret);
3254 _public_ int sd_bus_default(sd_bus **ret) {
3258 /* Let's try our best to reuse another cached connection. If
3259 * the starter bus type is set, connect via our normal
3260 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3261 * we can share the connection with the user/system default
3264 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3266 if (streq(e, "system"))
3267 return sd_bus_default_system(ret);
3268 #if 0 /// elogind does not support systemd units
3269 else if (STR_IN_SET(e, "user", "session"))
3270 return sd_bus_default_user(ret);
3274 /* No type is specified, so we have not other option than to
3275 * use the starter address if it is set. */
3277 e = secure_getenv("DBUS_STARTER_ADDRESS");
3280 return bus_default(sd_bus_open, &default_starter_bus, ret);
3283 /* Finally, if nothing is set use the cached connection for
3284 * the right scope */
3286 #if 0 /// elogind does not support systemd units
3287 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3288 return sd_bus_default_user(ret);
3291 return sd_bus_default_system(ret);
3294 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3295 assert_return(b, -EINVAL);
3296 assert_return(tid, -EINVAL);
3297 assert_return(!bus_pid_changed(b), -ECHILD);
3305 return sd_event_get_tid(b->event, tid);
3310 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3311 _cleanup_free_ char *e = NULL;
3314 assert_return(object_path_is_valid(prefix), -EINVAL);
3315 assert_return(external_id, -EINVAL);
3316 assert_return(ret_path, -EINVAL);
3318 e = bus_label_escape(external_id);
3322 ret = strjoin(prefix, "/", e);
3330 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3334 assert_return(object_path_is_valid(path), -EINVAL);
3335 assert_return(object_path_is_valid(prefix), -EINVAL);
3336 assert_return(external_id, -EINVAL);
3338 e = object_path_startswith(path, prefix);
3340 *external_id = NULL;
3344 ret = bus_label_unescape(e);
3352 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3353 _cleanup_strv_free_ char **labels = NULL;
3354 char *path, *path_pos, **label_pos;
3355 const char *sep, *template_pos;
3360 assert_return(out, -EINVAL);
3361 assert_return(path_template, -EINVAL);
3363 path_length = strlen(path_template);
3365 va_start(list, path_template);
3366 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3370 arg = va_arg(list, const char *);
3376 label = bus_label_escape(arg);
3382 r = strv_consume(&labels, label);
3388 /* add label length, but account for the format character */
3389 path_length += strlen(label) - 1;
3393 path = malloc(path_length + 1);
3400 for (template_pos = path_template; *template_pos; ) {
3401 sep = strchrnul(template_pos, '%');
3402 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3406 path_pos = stpcpy(path_pos, *label_pos++);
3407 template_pos = sep + 1;
3415 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3416 _cleanup_strv_free_ char **labels = NULL;
3417 const char *template_pos, *path_pos;
3423 * This decodes an object-path based on a template argument. The
3424 * template consists of a verbatim path, optionally including special
3427 * - Each occurrence of '%' in the template matches an arbitrary
3428 * substring of a label in the given path. At most one such
3429 * directive is allowed per label. For each such directive, the
3430 * caller must provide an output parameter (char **) via va_arg. If
3431 * NULL is passed, the given label is verified, but not returned.
3432 * For each matched label, the *decoded* label is stored in the
3433 * passed output argument, and the caller is responsible to free
3434 * it. Note that the output arguments are only modified if the
3435 * actualy path matched the template. Otherwise, they're left
3438 * This function returns <0 on error, 0 if the path does not match the
3439 * template, 1 if it matched.
3442 assert_return(path, -EINVAL);
3443 assert_return(path_template, -EINVAL);
3447 for (template_pos = path_template; *template_pos; ) {
3452 /* verify everything until the next '%' matches verbatim */
3453 sep = strchrnul(template_pos, '%');
3454 length = sep - template_pos;
3455 if (strncmp(path_pos, template_pos, length))
3459 template_pos += length;
3464 /* We found the next '%' character. Everything up until here
3465 * matched. We now skip ahead to the end of this label and make
3466 * sure it matches the tail of the label in the path. Then we
3467 * decode the string in-between and save it for later use. */
3469 ++template_pos; /* skip over '%' */
3471 sep = strchrnul(template_pos, '/');
3472 length = sep - template_pos; /* length of suffix to match verbatim */
3474 /* verify the suffixes match */
3475 sep = strchrnul(path_pos, '/');
3476 if (sep - path_pos < (ssize_t)length ||
3477 strncmp(sep - length, template_pos, length))
3480 template_pos += length; /* skip over matched label */
3481 length = sep - path_pos - length; /* length of sub-label to decode */
3483 /* store unescaped label for later use */
3484 label = bus_label_unescape_n(path_pos, length);
3488 r = strv_consume(&labels, label);
3492 path_pos = sep; /* skip decoded label and suffix */
3495 /* end of template must match end of path */
3499 /* copy the labels over to the caller */
3500 va_start(list, path_template);
3501 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3504 arg = va_arg(list, char **);
3517 _public_ int sd_bus_try_close(sd_bus *bus) {
3518 assert_return(bus, -EINVAL);
3519 assert_return(!bus_pid_changed(bus), -ECHILD);
3524 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3525 assert_return(bus, -EINVAL);
3526 assert_return(description, -EINVAL);
3527 assert_return(bus->description, -ENXIO);
3528 assert_return(!bus_pid_changed(bus), -ECHILD);
3530 *description = bus->description;
3534 int bus_get_root_path(sd_bus *bus) {
3537 if (bus->cgroup_root)
3540 r = cg_get_root_path(&bus->cgroup_root);
3542 bus->cgroup_root = strdup("/");
3543 if (!bus->cgroup_root)
3552 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3553 assert_return(bus, -EINVAL);
3554 assert_return(scope, -EINVAL);
3555 assert_return(!bus_pid_changed(bus), -ECHILD);
3562 if (bus->is_system) {
3570 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3572 assert_return(bus, -EINVAL);
3573 assert_return(address, -EINVAL);
3574 assert_return(!bus_pid_changed(bus), -ECHILD);
3577 *address = bus->address;
3584 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3585 assert_return(bus, -EINVAL);
3586 assert_return(mask, -EINVAL);
3587 assert_return(!bus_pid_changed(bus), -ECHILD);
3589 *mask = bus->creds_mask;
3593 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3594 assert_return(bus, -EINVAL);
3595 assert_return(!bus_pid_changed(bus), -ECHILD);
3597 return bus->bus_client;
3600 _public_ int sd_bus_is_server(sd_bus *bus) {
3601 assert_return(bus, -EINVAL);
3602 assert_return(!bus_pid_changed(bus), -ECHILD);
3604 return bus->is_server;
3607 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3608 assert_return(bus, -EINVAL);
3609 assert_return(!bus_pid_changed(bus), -ECHILD);
3611 return bus->anonymous_auth;
3614 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3615 assert_return(bus, -EINVAL);
3616 assert_return(!bus_pid_changed(bus), -ECHILD);
3618 return bus->trusted;
3621 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3622 assert_return(bus, -EINVAL);
3623 assert_return(!bus_pid_changed(bus), -ECHILD);
3625 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3628 static void flush_close(sd_bus *bus) {
3632 /* Flushes and closes the specified bus. We take a ref before,
3633 * to ensure the flushing does not cause the bus to be
3636 sd_bus_flush_close_unref(sd_bus_ref(bus));
3639 _public_ void sd_bus_default_flush_close(void) {
3640 flush_close(default_starter_bus);
3641 #if 0 /// elogind does not support user buses
3642 flush_close(default_user_bus);
3644 flush_close(default_system_bus);
3647 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3648 assert_return(bus, -EINVAL);
3650 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3651 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3652 * from the client side. */
3653 bus->exit_on_disconnect = b;
3655 /* If the exit condition was triggered already, exit immediately. */
3656 return bus_exit_now(bus);
3659 #if 0 /// UNNEEDED by elogind
3660 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3661 assert_return(bus, -EINVAL);
3663 return bus->exit_on_disconnect;