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))
793 free_and_replace(b->machine, machine);
795 b->machine = mfree(b->machine);
799 r = parse_pid(pid, &b->nspid);
805 b->sockaddr.un.sun_family = AF_UNIX;
806 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
807 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
813 static void bus_reset_parsed_address(sd_bus *b) {
817 b->sockaddr_size = 0;
818 b->exec_argv = strv_free(b->exec_argv);
819 b->exec_path = mfree(b->exec_path);
820 b->server_id = SD_ID128_NULL;
821 b->machine = mfree(b->machine);
825 static int bus_parse_next_address(sd_bus *b) {
826 _cleanup_free_ char *guid = NULL;
834 if (b->address[b->address_index] == 0)
837 bus_reset_parsed_address(b);
839 a = b->address + b->address_index;
848 if (startswith(a, "unix:")) {
851 r = parse_unix_address(b, &a, &guid);
856 } else if (startswith(a, "tcp:")) {
859 r = parse_tcp_address(b, &a, &guid);
865 } else if (startswith(a, "unixexec:")) {
868 r = parse_exec_address(b, &a, &guid);
874 } else if (startswith(a, "x-machine-unix:")) {
877 r = parse_container_unix_address(b, &a, &guid);
890 r = sd_id128_from_string(guid, &b->server_id);
895 b->address_index = a - b->address;
899 static int bus_start_address(sd_bus *b) {
907 /* If you provide multiple different bus-addresses, we
908 * try all of them in order and use the first one that
912 r = bus_socket_exec(b);
914 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
915 r = bus_container_connect_socket(b);
917 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
918 r = bus_socket_connect(b);
924 r = attach_io_events(b);
929 b->last_connect_error = -r;
932 r = bus_parse_next_address(b);
936 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
940 int bus_next_address(sd_bus *b) {
943 bus_reset_parsed_address(b);
944 return bus_start_address(b);
947 static int bus_start_fd(sd_bus *b) {
952 assert(b->input_fd >= 0);
953 assert(b->output_fd >= 0);
955 r = fd_nonblock(b->input_fd, true);
959 r = fd_cloexec(b->input_fd, true);
963 if (b->input_fd != b->output_fd) {
964 r = fd_nonblock(b->output_fd, true);
968 r = fd_cloexec(b->output_fd, true);
973 if (fstat(b->input_fd, &st) < 0)
976 return bus_socket_take_fd(b);
979 _public_ int sd_bus_start(sd_bus *bus) {
982 assert_return(bus, -EINVAL);
983 assert_return(bus->state == BUS_UNSET, -EPERM);
984 assert_return(!bus_pid_changed(bus), -ECHILD);
986 bus->state = BUS_OPENING;
988 if (bus->is_server && bus->bus_client)
991 if (bus->input_fd >= 0)
992 r = bus_start_fd(bus);
993 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
994 r = bus_start_address(bus);
1003 return bus_send_hello(bus);
1006 _public_ int sd_bus_open(sd_bus **ret) {
1011 assert_return(ret, -EINVAL);
1013 /* Let's connect to the starter bus if it is set, and
1014 * otherwise to the bus that is appropropriate for the scope
1015 * we are running in */
1017 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1019 if (streq(e, "system"))
1020 return sd_bus_open_system(ret);
1021 #if 0 /// elogind does not support systemd user instances
1022 else if (STR_IN_SET(e, "session", "user"))
1023 return sd_bus_open_user(ret);
1027 e = secure_getenv("DBUS_STARTER_ADDRESS");
1029 #if 0 /// elogind does not support systemd user instances
1030 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1031 return sd_bus_open_user(ret);
1034 return sd_bus_open_system(ret);
1041 r = sd_bus_set_address(b, e);
1045 b->bus_client = true;
1047 /* We don't know whether the bus is trusted or not, so better
1048 * be safe, and authenticate everything */
1050 b->is_local = false;
1051 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1052 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1054 r = sd_bus_start(b);
1066 int bus_set_address_system(sd_bus *b) {
1070 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1072 return sd_bus_set_address(b, e);
1074 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1077 _public_ int sd_bus_open_system(sd_bus **ret) {
1081 assert_return(ret, -EINVAL);
1087 r = bus_set_address_system(b);
1091 b->bus_client = true;
1092 b->is_system = true;
1094 /* Let's do per-method access control on the system bus. We
1095 * need the caller's UID and capability set for that. */
1097 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1098 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1101 r = sd_bus_start(b);
1113 #if 0 /// elogind can not open/use a user bus
1114 int bus_set_address_user(sd_bus *b) {
1116 _cleanup_free_ char *ee = NULL, *s = NULL;
1120 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1122 return sd_bus_set_address(b, e);
1124 e = secure_getenv("XDG_RUNTIME_DIR");
1128 ee = bus_address_escape(e);
1132 if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, ee) < 0)
1142 _public_ int sd_bus_open_user(sd_bus **ret) {
1143 #if 0 /// elogind does not support user buses
1147 assert_return(ret, -EINVAL);
1153 r = bus_set_address_user(b);
1157 b->bus_client = true;
1160 /* We don't do any per-method access control on the user
1165 r = sd_bus_start(b);
1176 return sd_bus_open_system(ret);
1180 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1181 _cleanup_free_ char *e = NULL;
1182 char *m = NULL, *c = NULL;
1187 /* Let's see if we shall enter some container */
1188 m = strchr(host, ':');
1192 /* Let's make sure this is not a port of some kind,
1193 * and is a valid machine name. */
1194 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1197 /* Cut out the host part */
1198 t = strndupa(host, m - host - 1);
1199 e = bus_address_escape(t);
1203 c = strjoina(",argv5=--machine=", m);
1208 e = bus_address_escape(host);
1213 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=systemd-stdio-bridge", c);
1220 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1224 assert_return(host, -EINVAL);
1225 assert_return(ret, -EINVAL);
1227 r = sd_bus_new(&bus);
1231 r = bus_set_address_system_remote(bus, host);
1235 bus->bus_client = true;
1236 bus->trusted = false;
1237 bus->is_system = true;
1238 bus->is_local = false;
1240 r = sd_bus_start(bus);
1252 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1253 _cleanup_free_ char *e = NULL;
1258 e = bus_address_escape(machine);
1262 b->address = strjoin("x-machine-unix:machine=", e);
1269 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1273 assert_return(machine, -EINVAL);
1274 assert_return(ret, -EINVAL);
1275 assert_return(machine_name_is_valid(machine), -EINVAL);
1277 r = sd_bus_new(&bus);
1281 r = bus_set_address_system_machine(bus, machine);
1285 bus->bus_client = true;
1286 bus->trusted = false;
1287 bus->is_system = true;
1288 bus->is_local = false;
1290 r = sd_bus_start(bus);
1302 _public_ void sd_bus_close(sd_bus *bus) {
1306 if (bus->state == BUS_CLOSED)
1308 if (bus_pid_changed(bus))
1311 bus->state = BUS_CLOSED;
1313 sd_bus_detach_event(bus);
1315 /* Drop all queued messages so that they drop references to
1316 * the bus object and the bus may be freed */
1317 bus_reset_queues(bus);
1322 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1330 return sd_bus_unref(bus);
1333 static void bus_enter_closing(sd_bus *bus) {
1336 if (!IN_SET(bus->state, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1339 bus->state = BUS_CLOSING;
1342 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1347 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1352 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1358 i = REFCNT_DEC(bus->n_ref);
1366 _public_ int sd_bus_is_open(sd_bus *bus) {
1368 assert_return(bus, -EINVAL);
1369 assert_return(!bus_pid_changed(bus), -ECHILD);
1371 return BUS_IS_OPEN(bus->state);
1374 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1377 assert_return(bus, -EINVAL);
1378 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1379 assert_return(!bus_pid_changed(bus), -ECHILD);
1381 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1384 if (type == SD_BUS_TYPE_UNIX_FD) {
1385 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1388 r = bus_ensure_running(bus);
1392 return bus->can_fds;
1395 return bus_type_is_valid(type);
1398 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1401 assert_return(bus, -EINVAL);
1402 assert_return(id, -EINVAL);
1403 assert_return(!bus_pid_changed(bus), -ECHILD);
1405 r = bus_ensure_running(bus);
1409 *id = bus->server_id;
1413 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1418 /* If we copy the same message to multiple
1419 * destinations, avoid using the same cookie
1421 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1426 timeout = BUS_DEFAULT_TIMEOUT;
1428 return bus_message_seal(m, ++b->cookie, timeout);
1431 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1432 bool remarshal = false;
1436 /* wrong packet version */
1437 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1440 /* wrong packet endianness */
1441 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1444 return remarshal ? bus_message_remarshal(b, m) : 0;
1447 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1451 /* Fake some timestamps, if they were requested, and not
1452 * already initialized */
1453 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1454 if (m->realtime <= 0)
1455 m->realtime = now(CLOCK_REALTIME);
1457 if (m->monotonic <= 0)
1458 m->monotonic = now(CLOCK_MONOTONIC);
1461 /* The bus specification says the serial number cannot be 0,
1462 * hence let's fill something in for synthetic messages. Since
1463 * synthetic messages might have a fake sender and we don't
1464 * want to interfere with the real sender's serial numbers we
1465 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1466 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1467 * even though kdbus can do 64bit. */
1468 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1471 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1477 r = bus_socket_write_message(bus, m, idx);
1481 if (*idx >= BUS_MESSAGE_SIZE(m))
1482 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",
1483 bus_message_type_to_string(m->header->type),
1484 strna(sd_bus_message_get_sender(m)),
1485 strna(sd_bus_message_get_destination(m)),
1486 strna(sd_bus_message_get_path(m)),
1487 strna(sd_bus_message_get_interface(m)),
1488 strna(sd_bus_message_get_member(m)),
1489 BUS_MESSAGE_COOKIE(m),
1491 strna(m->error.name),
1492 strna(m->error.message));
1497 static int dispatch_wqueue(sd_bus *bus) {
1501 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1503 while (bus->wqueue_size > 0) {
1505 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1509 /* Didn't do anything this time */
1511 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1512 /* Fully written. Let's drop the entry from
1515 * This isn't particularly optimized, but
1516 * well, this is supposed to be our worst-case
1517 * buffer only, and the socket buffer is
1518 * supposed to be our primary buffer, and if
1519 * it got full, then all bets are off
1523 sd_bus_message_unref(bus->wqueue[0]);
1524 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1534 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1537 return bus_socket_read_message(bus);
1540 int bus_rqueue_make_room(sd_bus *bus) {
1543 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1546 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1552 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1557 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1559 /* Note that the priority logic is only available on kdbus,
1560 * where the rqueue is unused. We check the rqueue here
1561 * anyway, because it's simple... */
1564 if (bus->rqueue_size > 0) {
1565 /* Dispatch a queued message */
1567 *m = bus->rqueue[0];
1569 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1573 /* Try to read a new message */
1574 r = bus_read_message(bus, hint_priority, priority);
1584 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1585 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1588 assert_return(m, -EINVAL);
1593 assert_return(!bus_pid_changed(bus), -ECHILD);
1595 if (!BUS_IS_OPEN(bus->state))
1599 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1606 /* If the cookie number isn't kept, then we know that no reply
1608 if (!cookie && !m->sealed)
1609 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1611 r = bus_seal_message(bus, m, 0);
1615 /* Remarshall if we have to. This will possibly unref the
1616 * message and place a replacement in m */
1617 r = bus_remarshal_message(bus, &m);
1621 /* If this is a reply and no reply was requested, then let's
1622 * suppress this, if we can */
1626 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1629 r = bus_write_message(bus, m, hint_sync_call, &idx);
1631 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1632 bus_enter_closing(bus);
1639 if (idx < BUS_MESSAGE_SIZE(m)) {
1640 /* Wasn't fully written. So let's remember how
1641 * much was written. Note that the first entry
1642 * of the wqueue array is always allocated so
1643 * that we always can remember how much was
1645 bus->wqueue[0] = sd_bus_message_ref(m);
1646 bus->wqueue_size = 1;
1651 /* Just append it to the queue. */
1653 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1656 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1659 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1664 *cookie = BUS_MESSAGE_COOKIE(m);
1669 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1670 return bus_send_internal(bus, m, cookie, false);
1673 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1676 assert_return(m, -EINVAL);
1681 assert_return(!bus_pid_changed(bus), -ECHILD);
1683 if (!BUS_IS_OPEN(bus->state))
1686 if (!streq_ptr(m->destination, destination)) {
1691 r = sd_bus_message_set_destination(m, destination);
1696 return sd_bus_send(bus, m, cookie);
1699 static usec_t calc_elapse(uint64_t usec) {
1700 if (usec == (uint64_t) -1)
1703 return now(CLOCK_MONOTONIC) + usec;
1706 static int timeout_compare(const void *a, const void *b) {
1707 const struct reply_callback *x = a, *y = b;
1709 if (x->timeout != 0 && y->timeout == 0)
1712 if (x->timeout == 0 && y->timeout != 0)
1715 if (x->timeout < y->timeout)
1718 if (x->timeout > y->timeout)
1724 _public_ int sd_bus_call_async(
1728 sd_bus_message_handler_t callback,
1732 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1733 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1736 assert_return(m, -EINVAL);
1737 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1738 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1739 assert_return(callback, -EINVAL);
1744 assert_return(!bus_pid_changed(bus), -ECHILD);
1746 if (!BUS_IS_OPEN(bus->state))
1749 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1753 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1757 r = bus_seal_message(bus, m, usec);
1761 r = bus_remarshal_message(bus, &m);
1765 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1769 s->reply_callback.callback = callback;
1771 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1772 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1774 s->reply_callback.cookie = 0;
1778 s->reply_callback.timeout = calc_elapse(m->timeout);
1779 if (s->reply_callback.timeout != 0) {
1780 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1782 s->reply_callback.timeout = 0;
1787 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1798 int bus_ensure_running(sd_bus *bus) {
1803 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
1805 if (bus->state == BUS_RUNNING)
1809 r = sd_bus_process(bus, NULL);
1812 if (bus->state == BUS_RUNNING)
1817 r = sd_bus_wait(bus, (uint64_t) -1);
1823 _public_ int sd_bus_call(
1827 sd_bus_error *error,
1828 sd_bus_message **reply) {
1830 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1836 bus_assert_return(m, -EINVAL, error);
1837 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
1838 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
1839 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
1844 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
1846 if (!BUS_IS_OPEN(bus->state)) {
1851 r = bus_ensure_running(bus);
1855 i = bus->rqueue_size;
1857 r = bus_seal_message(bus, m, usec);
1861 r = bus_remarshal_message(bus, &m);
1865 r = bus_send_internal(bus, m, &cookie, true);
1869 timeout = calc_elapse(m->timeout);
1874 while (i < bus->rqueue_size) {
1875 sd_bus_message *incoming = NULL;
1877 incoming = bus->rqueue[i];
1879 if (incoming->reply_cookie == cookie) {
1880 /* Found a match! */
1882 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1884 log_debug_bus_message(incoming);
1886 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
1888 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
1892 sd_bus_message_unref(incoming);
1897 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
1898 sd_bus_message_unref(incoming);
1901 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
1902 r = sd_bus_error_copy(error, &incoming->error);
1903 sd_bus_message_unref(incoming);
1910 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
1913 streq(bus->unique_name, incoming->sender)) {
1915 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1918 /* Our own message? Somebody is trying
1919 * to send its own client a message,
1920 * let's not dead-lock, let's fail
1923 sd_bus_message_unref(incoming);
1928 /* Try to read more, right-away */
1932 r = bus_read_message(bus, false, 0);
1934 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1935 bus_enter_closing(bus);
1947 n = now(CLOCK_MONOTONIC);
1955 left = (uint64_t) -1;
1957 r = bus_poll(bus, true, left);
1965 r = dispatch_wqueue(bus);
1967 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1968 bus_enter_closing(bus);
1977 return sd_bus_error_set_errno(error, r);
1980 _public_ int sd_bus_get_fd(sd_bus *bus) {
1982 assert_return(bus, -EINVAL);
1983 assert_return(bus->input_fd == bus->output_fd, -EPERM);
1984 assert_return(!bus_pid_changed(bus), -ECHILD);
1986 return bus->input_fd;
1989 _public_ int sd_bus_get_events(sd_bus *bus) {
1992 assert_return(bus, -EINVAL);
1993 assert_return(!bus_pid_changed(bus), -ECHILD);
1995 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
1998 if (bus->state == BUS_OPENING)
2000 else if (bus->state == BUS_AUTHENTICATING) {
2002 if (bus_socket_auth_needs_write(bus))
2007 } else if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)) {
2008 if (bus->rqueue_size <= 0)
2010 if (bus->wqueue_size > 0)
2017 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2018 struct reply_callback *c;
2020 assert_return(bus, -EINVAL);
2021 assert_return(timeout_usec, -EINVAL);
2022 assert_return(!bus_pid_changed(bus), -ECHILD);
2024 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2027 if (bus->track_queue) {
2032 if (bus->state == BUS_CLOSING) {
2037 if (bus->state == BUS_AUTHENTICATING) {
2038 *timeout_usec = bus->auth_timeout;
2042 if (!IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)) {
2043 *timeout_usec = (uint64_t) -1;
2047 if (bus->rqueue_size > 0) {
2052 c = prioq_peek(bus->reply_callbacks_prioq);
2054 *timeout_usec = (uint64_t) -1;
2058 if (c->timeout == 0) {
2059 *timeout_usec = (uint64_t) -1;
2063 *timeout_usec = c->timeout;
2067 static int process_timeout(sd_bus *bus) {
2068 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2069 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2070 struct reply_callback *c;
2077 c = prioq_peek(bus->reply_callbacks_prioq);
2081 n = now(CLOCK_MONOTONIC);
2085 r = bus_message_new_synthetic_error(
2088 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2093 r = bus_seal_synthetic_message(bus, m);
2097 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2100 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2103 slot = container_of(c, sd_bus_slot, reply_callback);
2105 bus->iteration_counter++;
2107 bus->current_message = m;
2108 bus->current_slot = sd_bus_slot_ref(slot);
2109 bus->current_handler = c->callback;
2110 bus->current_userdata = slot->userdata;
2111 r = c->callback(m, slot->userdata, &error_buffer);
2112 bus->current_userdata = NULL;
2113 bus->current_handler = NULL;
2114 bus->current_slot = NULL;
2115 bus->current_message = NULL;
2117 if (slot->floating) {
2118 bus_slot_disconnect(slot);
2119 sd_bus_slot_unref(slot);
2122 sd_bus_slot_unref(slot);
2124 return bus_maybe_reply_error(m, r, &error_buffer);
2127 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2131 if (bus->state != BUS_HELLO)
2134 /* Let's make sure the first message on the bus is the HELLO
2135 * reply. But note that we don't actually parse the message
2136 * here (we leave that to the usual handling), we just verify
2137 * we don't let any earlier msg through. */
2139 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2142 if (m->reply_cookie != 1)
2148 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2149 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2150 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2151 struct reply_callback *c;
2158 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2161 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2164 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2170 slot = container_of(c, sd_bus_slot, reply_callback);
2172 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2174 /* If the reply contained a file descriptor which we
2175 * didn't want we pass an error instead. */
2177 r = bus_message_new_synthetic_error(
2180 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2185 /* Copy over original timestamp */
2186 synthetic_reply->realtime = m->realtime;
2187 synthetic_reply->monotonic = m->monotonic;
2188 synthetic_reply->seqnum = m->seqnum;
2190 r = bus_seal_synthetic_message(bus, synthetic_reply);
2194 m = synthetic_reply;
2196 r = sd_bus_message_rewind(m, true);
2201 if (c->timeout != 0) {
2202 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2206 bus->current_slot = sd_bus_slot_ref(slot);
2207 bus->current_handler = c->callback;
2208 bus->current_userdata = slot->userdata;
2209 r = c->callback(m, slot->userdata, &error_buffer);
2210 bus->current_userdata = NULL;
2211 bus->current_handler = NULL;
2212 bus->current_slot = NULL;
2214 if (slot->floating) {
2215 bus_slot_disconnect(slot);
2216 sd_bus_slot_unref(slot);
2219 sd_bus_slot_unref(slot);
2221 return bus_maybe_reply_error(m, r, &error_buffer);
2224 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2225 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2226 struct filter_callback *l;
2233 bus->filter_callbacks_modified = false;
2235 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2238 if (bus->filter_callbacks_modified)
2241 /* Don't run this more than once per iteration */
2242 if (l->last_iteration == bus->iteration_counter)
2245 l->last_iteration = bus->iteration_counter;
2247 r = sd_bus_message_rewind(m, true);
2251 slot = container_of(l, sd_bus_slot, filter_callback);
2253 bus->current_slot = sd_bus_slot_ref(slot);
2254 bus->current_handler = l->callback;
2255 bus->current_userdata = slot->userdata;
2256 r = l->callback(m, slot->userdata, &error_buffer);
2257 bus->current_userdata = NULL;
2258 bus->current_handler = NULL;
2259 bus->current_slot = sd_bus_slot_unref(slot);
2261 r = bus_maybe_reply_error(m, r, &error_buffer);
2267 } while (bus->filter_callbacks_modified);
2272 static int process_match(sd_bus *bus, sd_bus_message *m) {
2279 bus->match_callbacks_modified = false;
2281 r = bus_match_run(bus, &bus->match_callbacks, m);
2285 } while (bus->match_callbacks_modified);
2290 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2291 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2297 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2300 if (bus->manual_peer_interface)
2303 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2306 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2309 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2312 if (streq_ptr(m->member, "Ping"))
2313 r = sd_bus_message_new_method_return(m, &reply);
2314 else if (streq_ptr(m->member, "GetMachineId")) {
2318 r = sd_id128_get_machine(&id);
2322 r = sd_bus_message_new_method_return(m, &reply);
2326 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2328 r = sd_bus_message_new_method_errorf(
2330 SD_BUS_ERROR_UNKNOWN_METHOD,
2331 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2337 r = sd_bus_send(bus, reply, NULL);
2344 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2348 /* If we got a message with a file descriptor which we didn't
2349 * want to accept, then let's drop it. How can this even
2350 * happen? For example, when the kernel queues a message into
2351 * an activatable names's queue which allows fds, and then is
2352 * delivered to us later even though we ourselves did not
2355 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2361 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2364 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2365 return 1; /* just eat it up */
2367 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2370 static int process_message(sd_bus *bus, sd_bus_message *m) {
2376 bus->current_message = m;
2377 bus->iteration_counter++;
2379 log_debug_bus_message(m);
2381 r = process_hello(bus, m);
2385 r = process_reply(bus, m);
2389 r = process_fd_check(bus, m);
2393 r = process_filter(bus, m);
2397 r = process_match(bus, m);
2401 r = process_builtin(bus, m);
2405 r = bus_process_object(bus, m);
2408 bus->current_message = NULL;
2412 static int dispatch_track(sd_bus *bus) {
2415 if (!bus->track_queue)
2418 bus_track_dispatch(bus->track_queue);
2422 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2423 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2427 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2429 r = process_timeout(bus);
2433 r = dispatch_wqueue(bus);
2437 r = dispatch_track(bus);
2441 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2447 r = process_message(bus, m);
2452 r = sd_bus_message_rewind(m, true);
2461 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2463 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2464 strna(sd_bus_message_get_sender(m)),
2465 strna(sd_bus_message_get_path(m)),
2466 strna(sd_bus_message_get_interface(m)),
2467 strna(sd_bus_message_get_member(m)));
2469 r = sd_bus_reply_method_errorf(
2471 SD_BUS_ERROR_UNKNOWN_OBJECT,
2472 "Unknown object '%s'.", m->path);
2486 static int bus_exit_now(sd_bus *bus) {
2489 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2490 * sd_event_exit(), otherwise invokes libc exit(). */
2492 if (bus->exited) /* did we already exit? */
2494 if (!bus->exit_triggered) /* was the exit condition triggered? */
2496 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2499 bus->exited = true; /* never exit more than once */
2501 log_debug("Bus connection disconnected, exiting.");
2504 return sd_event_exit(bus->event, EXIT_FAILURE);
2508 assert_not_reached("exit() didn't exit?");
2511 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2512 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2513 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2520 r = bus_message_new_synthetic_error(
2523 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2528 r = bus_seal_synthetic_message(bus, m);
2532 if (c->timeout != 0) {
2533 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2537 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2540 slot = container_of(c, sd_bus_slot, reply_callback);
2542 bus->iteration_counter++;
2544 bus->current_message = m;
2545 bus->current_slot = sd_bus_slot_ref(slot);
2546 bus->current_handler = c->callback;
2547 bus->current_userdata = slot->userdata;
2548 r = c->callback(m, slot->userdata, &error_buffer);
2549 bus->current_userdata = NULL;
2550 bus->current_handler = NULL;
2551 bus->current_slot = NULL;
2552 bus->current_message = NULL;
2554 if (slot->floating) {
2555 bus_slot_disconnect(slot);
2556 sd_bus_slot_unref(slot);
2559 sd_bus_slot_unref(slot);
2561 return bus_maybe_reply_error(m, r, &error_buffer);
2564 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2565 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2566 struct reply_callback *c;
2570 assert(bus->state == BUS_CLOSING);
2572 /* First, fail all outstanding method calls */
2573 c = ordered_hashmap_first(bus->reply_callbacks);
2575 return process_closing_reply_callback(bus, c);
2577 /* Then, fake-drop all remaining bus tracking references */
2579 bus_track_close(bus->tracks);
2583 /* Then, synthesize a Disconnected message */
2584 r = sd_bus_message_new_signal(
2587 "/org/freedesktop/DBus/Local",
2588 "org.freedesktop.DBus.Local",
2593 bus_message_set_sender_local(bus, m);
2595 r = bus_seal_synthetic_message(bus, m);
2601 bus->current_message = m;
2602 bus->iteration_counter++;
2604 r = process_filter(bus, m);
2608 r = process_match(bus, m);
2612 /* Nothing else to do, exit now, if the condition holds */
2613 bus->exit_triggered = true;
2614 (void) bus_exit_now(bus);
2624 bus->current_message = NULL;
2629 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2630 BUS_DONT_DESTROY(bus);
2633 /* Returns 0 when we didn't do anything. This should cause the
2634 * caller to invoke sd_bus_wait() before returning the next
2635 * time. Returns > 0 when we did something, which possibly
2636 * means *ret is filled in with an unprocessed message. */
2638 assert_return(bus, -EINVAL);
2639 assert_return(!bus_pid_changed(bus), -ECHILD);
2641 /* We don't allow recursively invoking sd_bus_process(). */
2642 assert_return(!bus->current_message, -EBUSY);
2643 assert(!bus->current_slot);
2645 switch (bus->state) {
2654 r = bus_socket_process_opening(bus);
2655 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2656 bus_enter_closing(bus);
2664 case BUS_AUTHENTICATING:
2665 r = bus_socket_process_authenticating(bus);
2666 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2667 bus_enter_closing(bus);
2679 r = process_running(bus, hint_priority, priority, ret);
2680 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2681 bus_enter_closing(bus);
2691 return process_closing(bus, ret);
2694 assert_not_reached("Unknown state");
2697 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2698 return bus_process_internal(bus, false, 0, ret);
2701 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2702 return bus_process_internal(bus, true, priority, ret);
2705 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2706 struct pollfd p[2] = {};
2709 usec_t m = USEC_INFINITY;
2713 if (bus->state == BUS_CLOSING)
2716 if (!BUS_IS_OPEN(bus->state))
2719 e = sd_bus_get_events(bus);
2724 /* The caller really needs some more data, he doesn't
2725 * care about what's already read, or any timeouts
2726 * except its own. */
2730 /* The caller wants to process if there's something to
2731 * process, but doesn't care otherwise */
2733 r = sd_bus_get_timeout(bus, &until);
2738 nw = now(CLOCK_MONOTONIC);
2739 m = until > nw ? until - nw : 0;
2743 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2746 p[0].fd = bus->input_fd;
2747 if (bus->output_fd == bus->input_fd) {
2751 p[0].events = e & POLLIN;
2752 p[1].fd = bus->output_fd;
2753 p[1].events = e & POLLOUT;
2757 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2761 return r > 0 ? 1 : 0;
2764 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2766 assert_return(bus, -EINVAL);
2767 assert_return(!bus_pid_changed(bus), -ECHILD);
2769 if (bus->state == BUS_CLOSING)
2772 if (!BUS_IS_OPEN(bus->state))
2775 if (bus->rqueue_size > 0)
2778 return bus_poll(bus, false, timeout_usec);
2781 _public_ int sd_bus_flush(sd_bus *bus) {
2784 assert_return(bus, -EINVAL);
2785 assert_return(!bus_pid_changed(bus), -ECHILD);
2787 if (bus->state == BUS_CLOSING)
2790 if (!BUS_IS_OPEN(bus->state))
2793 r = bus_ensure_running(bus);
2797 if (bus->wqueue_size <= 0)
2801 r = dispatch_wqueue(bus);
2803 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2804 bus_enter_closing(bus);
2811 if (bus->wqueue_size <= 0)
2814 r = bus_poll(bus, false, (uint64_t) -1);
2820 _public_ int sd_bus_add_filter(
2823 sd_bus_message_handler_t callback,
2828 assert_return(bus, -EINVAL);
2829 assert_return(callback, -EINVAL);
2830 assert_return(!bus_pid_changed(bus), -ECHILD);
2832 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
2836 s->filter_callback.callback = callback;
2838 bus->filter_callbacks_modified = true;
2839 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
2847 _public_ int sd_bus_add_match(
2851 sd_bus_message_handler_t callback,
2854 struct bus_match_component *components = NULL;
2855 unsigned n_components = 0;
2856 sd_bus_slot *s = NULL;
2859 assert_return(bus, -EINVAL);
2860 assert_return(match, -EINVAL);
2861 assert_return(!bus_pid_changed(bus), -ECHILD);
2863 r = bus_match_parse(match, &components, &n_components);
2867 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
2873 s->match_callback.callback = callback;
2875 if (bus->bus_client) {
2876 enum bus_match_scope scope;
2878 scope = bus_match_get_scope(components, n_components);
2880 /* Do not install server-side matches for matches
2881 * against the local service, interface or bus path. */
2882 if (scope != BUS_MATCH_LOCAL) {
2884 /* We store the original match string, so that
2885 * we can use it to remove the match again. */
2887 s->match_callback.match_string = strdup(match);
2888 if (!s->match_callback.match_string) {
2893 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components);
2897 s->match_added = true;
2901 bus->match_callbacks_modified = true;
2902 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
2911 bus_match_parse_free(components, n_components);
2912 sd_bus_slot_unref(s);
2917 #if 0 /// UNNEEDED by elogind
2918 int bus_remove_match_by_string(
2921 sd_bus_message_handler_t callback,
2924 struct bus_match_component *components = NULL;
2925 unsigned n_components = 0;
2926 struct match_callback *c;
2929 assert_return(bus, -EINVAL);
2930 assert_return(match, -EINVAL);
2931 assert_return(!bus_pid_changed(bus), -ECHILD);
2933 r = bus_match_parse(match, &components, &n_components);
2937 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
2941 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
2944 bus_match_parse_free(components, n_components);
2950 bool bus_pid_changed(sd_bus *bus) {
2953 /* We don't support people creating a bus connection and
2954 * keeping it around over a fork(). Let's complain. */
2956 return bus->original_pid != getpid_cached();
2959 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
2960 sd_bus *bus = userdata;
2965 r = sd_bus_process(bus, NULL);
2972 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
2973 sd_bus *bus = userdata;
2978 r = sd_bus_process(bus, NULL);
2985 static int prepare_callback(sd_event_source *s, void *userdata) {
2986 sd_bus *bus = userdata;
2993 e = sd_bus_get_events(bus);
2997 if (bus->output_fd != bus->input_fd) {
2999 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3003 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3007 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3012 r = sd_bus_get_timeout(bus, &until);
3018 j = sd_event_source_set_time(bus->time_event_source, until);
3023 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3030 static int quit_callback(sd_event_source *event, void *userdata) {
3031 sd_bus *bus = userdata;
3041 static int attach_io_events(sd_bus *bus) {
3046 if (bus->input_fd < 0)
3052 if (!bus->input_io_event_source) {
3053 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3057 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3061 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3065 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3067 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3072 if (bus->output_fd != bus->input_fd) {
3073 assert(bus->output_fd >= 0);
3075 if (!bus->output_io_event_source) {
3076 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3080 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3084 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3086 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3095 static void detach_io_events(sd_bus *bus) {
3098 if (bus->input_io_event_source) {
3099 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3100 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3103 if (bus->output_io_event_source) {
3104 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3105 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3109 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3112 assert_return(bus, -EINVAL);
3113 assert_return(!bus->event, -EBUSY);
3115 assert(!bus->input_io_event_source);
3116 assert(!bus->output_io_event_source);
3117 assert(!bus->time_event_source);
3120 bus->event = sd_event_ref(event);
3122 r = sd_event_default(&bus->event);
3127 bus->event_priority = priority;
3129 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3133 r = sd_event_source_set_priority(bus->time_event_source, priority);
3137 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3141 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3145 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3149 r = attach_io_events(bus);
3156 sd_bus_detach_event(bus);
3160 _public_ int sd_bus_detach_event(sd_bus *bus) {
3161 assert_return(bus, -EINVAL);
3166 detach_io_events(bus);
3168 if (bus->time_event_source) {
3169 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3170 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3173 if (bus->quit_event_source) {
3174 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3175 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3178 bus->event = sd_event_unref(bus->event);
3182 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3183 assert_return(bus, NULL);
3188 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3189 assert_return(bus, NULL);
3191 return bus->current_message;
3194 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3195 assert_return(bus, NULL);
3197 return bus->current_slot;
3200 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3201 assert_return(bus, NULL);
3203 return bus->current_handler;
3206 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3207 assert_return(bus, NULL);
3209 return bus->current_userdata;
3212 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3217 assert(default_bus);
3220 return !!*default_bus;
3223 *ret = sd_bus_ref(*default_bus);
3231 b->default_bus_ptr = default_bus;
3239 _public_ int sd_bus_default_system(sd_bus **ret) {
3240 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3244 _public_ int sd_bus_default_user(sd_bus **ret) {
3245 #if 0 /// elogind does not support user buses
3246 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3248 return sd_bus_default_system(ret);
3252 _public_ int sd_bus_default(sd_bus **ret) {
3256 /* Let's try our best to reuse another cached connection. If
3257 * the starter bus type is set, connect via our normal
3258 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3259 * we can share the connection with the user/system default
3262 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3264 if (streq(e, "system"))
3265 return sd_bus_default_system(ret);
3266 #if 0 /// elogind does not support systemd units
3267 else if (STR_IN_SET(e, "user", "session"))
3268 return sd_bus_default_user(ret);
3272 /* No type is specified, so we have not other option than to
3273 * use the starter address if it is set. */
3275 e = secure_getenv("DBUS_STARTER_ADDRESS");
3278 return bus_default(sd_bus_open, &default_starter_bus, ret);
3281 /* Finally, if nothing is set use the cached connection for
3282 * the right scope */
3284 #if 0 /// elogind does not support systemd user instances
3285 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3286 return sd_bus_default_user(ret);
3289 return sd_bus_default_system(ret);
3292 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3293 assert_return(b, -EINVAL);
3294 assert_return(tid, -EINVAL);
3295 assert_return(!bus_pid_changed(b), -ECHILD);
3303 return sd_event_get_tid(b->event, tid);
3308 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3309 _cleanup_free_ char *e = NULL;
3312 assert_return(object_path_is_valid(prefix), -EINVAL);
3313 assert_return(external_id, -EINVAL);
3314 assert_return(ret_path, -EINVAL);
3316 e = bus_label_escape(external_id);
3320 ret = strjoin(prefix, "/", e);
3328 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3332 assert_return(object_path_is_valid(path), -EINVAL);
3333 assert_return(object_path_is_valid(prefix), -EINVAL);
3334 assert_return(external_id, -EINVAL);
3336 e = object_path_startswith(path, prefix);
3338 *external_id = NULL;
3342 ret = bus_label_unescape(e);
3350 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3351 _cleanup_strv_free_ char **labels = NULL;
3352 char *path, *path_pos, **label_pos;
3353 const char *sep, *template_pos;
3358 assert_return(out, -EINVAL);
3359 assert_return(path_template, -EINVAL);
3361 path_length = strlen(path_template);
3363 va_start(list, path_template);
3364 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3368 arg = va_arg(list, const char *);
3374 label = bus_label_escape(arg);
3380 r = strv_consume(&labels, label);
3386 /* add label length, but account for the format character */
3387 path_length += strlen(label) - 1;
3391 path = malloc(path_length + 1);
3398 for (template_pos = path_template; *template_pos; ) {
3399 sep = strchrnul(template_pos, '%');
3400 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3404 path_pos = stpcpy(path_pos, *label_pos++);
3405 template_pos = sep + 1;
3413 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3414 _cleanup_strv_free_ char **labels = NULL;
3415 const char *template_pos, *path_pos;
3421 * This decodes an object-path based on a template argument. The
3422 * template consists of a verbatim path, optionally including special
3425 * - Each occurrence of '%' in the template matches an arbitrary
3426 * substring of a label in the given path. At most one such
3427 * directive is allowed per label. For each such directive, the
3428 * caller must provide an output parameter (char **) via va_arg. If
3429 * NULL is passed, the given label is verified, but not returned.
3430 * For each matched label, the *decoded* label is stored in the
3431 * passed output argument, and the caller is responsible to free
3432 * it. Note that the output arguments are only modified if the
3433 * actualy path matched the template. Otherwise, they're left
3436 * This function returns <0 on error, 0 if the path does not match the
3437 * template, 1 if it matched.
3440 assert_return(path, -EINVAL);
3441 assert_return(path_template, -EINVAL);
3445 for (template_pos = path_template; *template_pos; ) {
3450 /* verify everything until the next '%' matches verbatim */
3451 sep = strchrnul(template_pos, '%');
3452 length = sep - template_pos;
3453 if (strncmp(path_pos, template_pos, length))
3457 template_pos += length;
3462 /* We found the next '%' character. Everything up until here
3463 * matched. We now skip ahead to the end of this label and make
3464 * sure it matches the tail of the label in the path. Then we
3465 * decode the string in-between and save it for later use. */
3467 ++template_pos; /* skip over '%' */
3469 sep = strchrnul(template_pos, '/');
3470 length = sep - template_pos; /* length of suffix to match verbatim */
3472 /* verify the suffixes match */
3473 sep = strchrnul(path_pos, '/');
3474 if (sep - path_pos < (ssize_t)length ||
3475 strncmp(sep - length, template_pos, length))
3478 template_pos += length; /* skip over matched label */
3479 length = sep - path_pos - length; /* length of sub-label to decode */
3481 /* store unescaped label for later use */
3482 label = bus_label_unescape_n(path_pos, length);
3486 r = strv_consume(&labels, label);
3490 path_pos = sep; /* skip decoded label and suffix */
3493 /* end of template must match end of path */
3497 /* copy the labels over to the caller */
3498 va_start(list, path_template);
3499 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3502 arg = va_arg(list, char **);
3515 _public_ int sd_bus_try_close(sd_bus *bus) {
3516 assert_return(bus, -EINVAL);
3517 assert_return(!bus_pid_changed(bus), -ECHILD);
3522 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3523 assert_return(bus, -EINVAL);
3524 assert_return(description, -EINVAL);
3525 assert_return(bus->description, -ENXIO);
3526 assert_return(!bus_pid_changed(bus), -ECHILD);
3528 *description = bus->description;
3532 int bus_get_root_path(sd_bus *bus) {
3535 if (bus->cgroup_root)
3538 r = cg_get_root_path(&bus->cgroup_root);
3540 bus->cgroup_root = strdup("/");
3541 if (!bus->cgroup_root)
3550 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3551 assert_return(bus, -EINVAL);
3552 assert_return(scope, -EINVAL);
3553 assert_return(!bus_pid_changed(bus), -ECHILD);
3560 if (bus->is_system) {
3568 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3570 assert_return(bus, -EINVAL);
3571 assert_return(address, -EINVAL);
3572 assert_return(!bus_pid_changed(bus), -ECHILD);
3575 *address = bus->address;
3582 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3583 assert_return(bus, -EINVAL);
3584 assert_return(mask, -EINVAL);
3585 assert_return(!bus_pid_changed(bus), -ECHILD);
3587 *mask = bus->creds_mask;
3591 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3592 assert_return(bus, -EINVAL);
3593 assert_return(!bus_pid_changed(bus), -ECHILD);
3595 return bus->bus_client;
3598 _public_ int sd_bus_is_server(sd_bus *bus) {
3599 assert_return(bus, -EINVAL);
3600 assert_return(!bus_pid_changed(bus), -ECHILD);
3602 return bus->is_server;
3605 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3606 assert_return(bus, -EINVAL);
3607 assert_return(!bus_pid_changed(bus), -ECHILD);
3609 return bus->anonymous_auth;
3612 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3613 assert_return(bus, -EINVAL);
3614 assert_return(!bus_pid_changed(bus), -ECHILD);
3616 return bus->trusted;
3619 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3620 assert_return(bus, -EINVAL);
3621 assert_return(!bus_pid_changed(bus), -ECHILD);
3623 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3626 static void flush_close(sd_bus *bus) {
3630 /* Flushes and closes the specified bus. We take a ref before,
3631 * to ensure the flushing does not cause the bus to be
3634 sd_bus_flush_close_unref(sd_bus_ref(bus));
3637 _public_ void sd_bus_default_flush_close(void) {
3638 flush_close(default_starter_bus);
3639 #if 0 /// elogind does not support user buses
3640 flush_close(default_user_bus);
3642 flush_close(default_system_bus);
3645 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3646 assert_return(bus, -EINVAL);
3648 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3649 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3650 * from the client side. */
3651 bus->exit_on_disconnect = b;
3653 /* If the exit condition was triggered already, exit immediately. */
3654 return bus_exit_now(bus);
3657 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3658 assert_return(bus, -EINVAL);
3660 return bus->exit_on_disconnect;