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 #define log_debug_bus_message(m) \
58 sd_bus_message *_mm = (m); \
59 log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s", \
60 bus_message_type_to_string(_mm->header->type), \
61 strna(sd_bus_message_get_sender(_mm)), \
62 strna(sd_bus_message_get_destination(_mm)), \
63 strna(sd_bus_message_get_path(_mm)), \
64 strna(sd_bus_message_get_interface(_mm)), \
65 strna(sd_bus_message_get_member(_mm)), \
66 BUS_MESSAGE_COOKIE(_mm), \
68 strna(_mm->error.message)); \
71 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
72 static int attach_io_events(sd_bus *b);
73 static void detach_io_events(sd_bus *b);
75 static thread_local sd_bus *default_system_bus = NULL;
76 #if 0 /// UNNEEDED by elogind
77 static thread_local sd_bus *default_user_bus = NULL;
79 static thread_local sd_bus *default_starter_bus = NULL;
81 static void bus_close_fds(sd_bus *b) {
86 if (b->input_fd != b->output_fd)
87 safe_close(b->output_fd);
88 b->output_fd = b->input_fd = safe_close(b->input_fd);
91 static void bus_reset_queues(sd_bus *b) {
94 while (b->rqueue_size > 0)
95 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
97 b->rqueue = mfree(b->rqueue);
98 b->rqueue_allocated = 0;
100 while (b->wqueue_size > 0)
101 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
103 b->wqueue = mfree(b->wqueue);
104 b->wqueue_allocated = 0;
107 static void bus_free(sd_bus *b) {
111 assert(!b->track_queue);
114 b->state = BUS_CLOSED;
116 sd_bus_detach_event(b);
118 while ((s = b->slots)) {
119 /* At this point only floating slots can still be
120 * around, because the non-floating ones keep a
121 * reference to the bus, and we thus couldn't be
122 * destructing right now... We forcibly disconnect the
123 * slots here, so that they still can be referenced by
124 * apps, but are dead. */
127 bus_slot_disconnect(s);
128 sd_bus_slot_unref(s);
131 if (b->default_bus_ptr)
132 *b->default_bus_ptr = NULL;
138 free(b->unique_name);
139 free(b->auth_buffer);
142 free(b->cgroup_root);
143 free(b->description);
146 strv_free(b->exec_argv);
148 close_many(b->fds, b->n_fds);
153 ordered_hashmap_free_free(b->reply_callbacks);
154 prioq_free(b->reply_callbacks_prioq);
156 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
157 bus_match_free(&b->match_callbacks);
159 hashmap_free_free(b->vtable_methods);
160 hashmap_free_free(b->vtable_properties);
162 assert(hashmap_isempty(b->nodes));
163 hashmap_free(b->nodes);
167 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
172 _public_ int sd_bus_new(sd_bus **ret) {
175 assert_return(ret, -EINVAL);
181 r->n_ref = REFCNT_INIT;
182 r->input_fd = r->output_fd = -1;
183 r->message_version = 1;
184 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
185 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
186 r->attach_flags |= KDBUS_ATTACH_NAMES;
187 r->original_pid = getpid_cached();
189 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
191 /* We guarantee that wqueue always has space for at least one
193 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
202 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
205 assert_return(bus, -EINVAL);
206 assert_return(bus->state == BUS_UNSET, -EPERM);
207 assert_return(address, -EINVAL);
208 assert_return(!bus_pid_changed(bus), -ECHILD);
220 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
221 assert_return(bus, -EINVAL);
222 assert_return(bus->state == BUS_UNSET, -EPERM);
223 assert_return(input_fd >= 0, -EBADF);
224 assert_return(output_fd >= 0, -EBADF);
225 assert_return(!bus_pid_changed(bus), -ECHILD);
227 bus->input_fd = input_fd;
228 bus->output_fd = output_fd;
232 #if 0 /// UNNEEDED by elogind
233 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
236 assert_return(bus, -EINVAL);
237 assert_return(bus->state == BUS_UNSET, -EPERM);
238 assert_return(path, -EINVAL);
239 assert_return(!strv_isempty(argv), -EINVAL);
240 assert_return(!bus_pid_changed(bus), -ECHILD);
252 free(bus->exec_path);
253 strv_free(bus->exec_argv);
262 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
263 assert_return(bus, -EINVAL);
264 assert_return(bus->state == BUS_UNSET, -EPERM);
265 assert_return(!bus_pid_changed(bus), -ECHILD);
267 bus->bus_client = !!b;
271 #if 0 /// UNNEEDED by elogind
272 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
273 assert_return(bus, -EINVAL);
274 assert_return(bus->state == BUS_UNSET, -EPERM);
275 assert_return(!bus_pid_changed(bus), -ECHILD);
277 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 #if 0 /// UNNEEDED by elogind
292 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
294 assert_return(bus, -EINVAL);
295 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
296 assert_return(!bus_pid_changed(bus), -ECHILD);
298 new_flags = bus->attach_flags;
299 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
301 if (bus->attach_flags == new_flags)
304 bus->attach_flags = new_flags;
309 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
312 assert_return(bus, -EINVAL);
313 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
314 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
315 assert_return(!bus_pid_changed(bus), -ECHILD);
317 SET_FLAG(bus->creds_mask, mask, b);
319 /* The well knowns we need unconditionally, so that matches can work */
320 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
322 /* Make sure we don't lose the timestamp flag */
323 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
324 if (bus->attach_flags == new_flags)
327 bus->attach_flags = new_flags;
333 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
334 assert_return(bus, -EINVAL);
335 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
336 assert_return(bus->state == BUS_UNSET, -EPERM);
337 assert_return(!bus_pid_changed(bus), -ECHILD);
339 bus->is_server = !!b;
340 bus->server_id = server_id;
344 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
345 assert_return(bus, -EINVAL);
346 assert_return(bus->state == BUS_UNSET, -EPERM);
347 assert_return(!bus_pid_changed(bus), -ECHILD);
349 bus->anonymous_auth = !!b;
353 #if 0 /// UNNEEDED by elogind
354 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
355 assert_return(bus, -EINVAL);
356 assert_return(bus->state == BUS_UNSET, -EPERM);
357 assert_return(!bus_pid_changed(bus), -ECHILD);
363 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
364 assert_return(bus, -EINVAL);
365 assert_return(bus->state == BUS_UNSET, -EPERM);
366 assert_return(!bus_pid_changed(bus), -ECHILD);
368 return free_and_strdup(&bus->description, description);
372 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
373 assert_return(bus, -EINVAL);
374 assert_return(!bus_pid_changed(bus), -ECHILD);
376 bus->allow_interactive_authorization = !!b;
380 #if 0 /// UNNEEDED by elogind
381 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
382 assert_return(bus, -EINVAL);
383 assert_return(!bus_pid_changed(bus), -ECHILD);
385 return bus->allow_interactive_authorization;
389 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
397 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
399 r = sd_bus_message_get_errno(reply);
403 r = sd_bus_message_read(reply, "s", &s);
407 if (!service_name_is_valid(s) || s[0] != ':')
410 bus->unique_name = strdup(s);
411 if (!bus->unique_name)
414 if (bus->state == BUS_HELLO)
415 bus->state = BUS_RUNNING;
420 static int bus_send_hello(sd_bus *bus) {
421 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
426 if (!bus->bus_client)
429 r = sd_bus_message_new_method_call(
432 "org.freedesktop.DBus",
433 "/org/freedesktop/DBus",
434 "org.freedesktop.DBus",
439 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
442 int bus_start_running(sd_bus *bus) {
445 if (bus->bus_client) {
446 bus->state = BUS_HELLO;
450 bus->state = BUS_RUNNING;
454 static int parse_address_key(const char **p, const char *key, char **value) {
455 size_t l, n = 0, allocated = 0;
465 if (strncmp(*p, key, l) != 0)
478 while (*a != ';' && *a != ',' && *a != 0) {
496 c = (char) ((x << 4) | y);
503 if (!GREEDY_REALLOC(r, allocated, n + 2))
527 static void skip_address_key(const char **p) {
531 *p += strcspn(*p, ",");
537 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
538 _cleanup_free_ char *path = NULL, *abstract = NULL;
547 while (**p != 0 && **p != ';') {
548 r = parse_address_key(p, "guid", guid);
554 r = parse_address_key(p, "path", &path);
560 r = parse_address_key(p, "abstract", &abstract);
569 if (!path && !abstract)
572 if (path && abstract)
577 if (l > sizeof(b->sockaddr.un.sun_path))
580 b->sockaddr.un.sun_family = AF_UNIX;
581 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
582 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
583 } else if (abstract) {
584 l = strlen(abstract);
585 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
588 b->sockaddr.un.sun_family = AF_UNIX;
589 b->sockaddr.un.sun_path[0] = 0;
590 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
591 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
599 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
600 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
602 struct addrinfo *result, hints = {
603 .ai_socktype = SOCK_STREAM,
604 .ai_flags = AI_ADDRCONFIG,
612 while (**p != 0 && **p != ';') {
613 r = parse_address_key(p, "guid", guid);
619 r = parse_address_key(p, "host", &host);
625 r = parse_address_key(p, "port", &port);
631 r = parse_address_key(p, "family", &family);
644 if (streq(family, "ipv4"))
645 hints.ai_family = AF_INET;
646 else if (streq(family, "ipv6"))
647 hints.ai_family = AF_INET6;
652 r = getaddrinfo(host, port, &hints, &result);
656 return -EADDRNOTAVAIL;
658 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
659 b->sockaddr_size = result->ai_addrlen;
661 freeaddrinfo(result);
668 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
670 unsigned n_argv = 0, j;
672 size_t allocated = 0;
680 while (**p != 0 && **p != ';') {
681 r = parse_address_key(p, "guid", guid);
687 r = parse_address_key(p, "path", &path);
693 if (startswith(*p, "argv")) {
697 ul = strtoul(*p + 4, (char**) p, 10);
698 if (errno > 0 || **p != '=' || ul > 256) {
706 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
714 r = parse_address_key(p, NULL, argv + ul);
729 /* Make sure there are no holes in the array, with the
730 * exception of argv[0] */
731 for (j = 1; j < n_argv; j++)
737 if (argv && argv[0] == NULL) {
738 argv[0] = strdup(path);
753 for (j = 0; j < n_argv; j++)
761 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
762 _cleanup_free_ char *machine = NULL, *pid = NULL;
770 while (**p != 0 && **p != ';') {
771 r = parse_address_key(p, "guid", guid);
777 r = parse_address_key(p, "machine", &machine);
783 r = parse_address_key(p, "pid", &pid);
792 if (!machine == !pid)
796 if (!machine_name_is_valid(machine))
800 b->machine = machine;
803 b->machine = mfree(b->machine);
807 r = parse_pid(pid, &b->nspid);
813 b->sockaddr.un.sun_family = AF_UNIX;
814 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
815 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
821 static void bus_reset_parsed_address(sd_bus *b) {
825 b->sockaddr_size = 0;
826 b->exec_argv = strv_free(b->exec_argv);
827 b->exec_path = mfree(b->exec_path);
828 b->server_id = SD_ID128_NULL;
829 b->machine = mfree(b->machine);
833 static int bus_parse_next_address(sd_bus *b) {
834 _cleanup_free_ char *guid = NULL;
842 if (b->address[b->address_index] == 0)
845 bus_reset_parsed_address(b);
847 a = b->address + b->address_index;
856 if (startswith(a, "unix:")) {
859 r = parse_unix_address(b, &a, &guid);
864 } else if (startswith(a, "tcp:")) {
867 r = parse_tcp_address(b, &a, &guid);
873 } else if (startswith(a, "unixexec:")) {
876 r = parse_exec_address(b, &a, &guid);
882 } else if (startswith(a, "x-machine-unix:")) {
885 r = parse_container_unix_address(b, &a, &guid);
898 r = sd_id128_from_string(guid, &b->server_id);
903 b->address_index = a - b->address;
907 static int bus_start_address(sd_bus *b) {
915 /* If you provide multiple different bus-addresses, we
916 * try all of them in order and use the first one that
920 r = bus_socket_exec(b);
922 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
923 r = bus_container_connect_socket(b);
925 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
926 r = bus_socket_connect(b);
932 r = attach_io_events(b);
937 b->last_connect_error = -r;
940 r = bus_parse_next_address(b);
944 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
948 int bus_next_address(sd_bus *b) {
951 bus_reset_parsed_address(b);
952 return bus_start_address(b);
955 static int bus_start_fd(sd_bus *b) {
960 assert(b->input_fd >= 0);
961 assert(b->output_fd >= 0);
963 r = fd_nonblock(b->input_fd, true);
967 r = fd_cloexec(b->input_fd, true);
971 if (b->input_fd != b->output_fd) {
972 r = fd_nonblock(b->output_fd, true);
976 r = fd_cloexec(b->output_fd, true);
981 if (fstat(b->input_fd, &st) < 0)
984 return bus_socket_take_fd(b);
987 _public_ int sd_bus_start(sd_bus *bus) {
990 assert_return(bus, -EINVAL);
991 assert_return(bus->state == BUS_UNSET, -EPERM);
992 assert_return(!bus_pid_changed(bus), -ECHILD);
994 bus->state = BUS_OPENING;
996 if (bus->is_server && bus->bus_client)
999 if (bus->input_fd >= 0)
1000 r = bus_start_fd(bus);
1001 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1002 r = bus_start_address(bus);
1011 return bus_send_hello(bus);
1014 _public_ int sd_bus_open(sd_bus **ret) {
1019 assert_return(ret, -EINVAL);
1021 /* Let's connect to the starter bus if it is set, and
1022 * otherwise to the bus that is appropropriate for the scope
1023 * we are running in */
1025 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1027 if (streq(e, "system"))
1028 return sd_bus_open_system(ret);
1029 #if 0 /// elogind does not support systemd units
1030 else if (STR_IN_SET(e, "session", "user"))
1031 return sd_bus_open_user(ret);
1035 e = secure_getenv("DBUS_STARTER_ADDRESS");
1037 #if 0 /// elogind does not support systemd units
1038 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1039 return sd_bus_open_user(ret);
1042 return sd_bus_open_system(ret);
1049 r = sd_bus_set_address(b, e);
1053 b->bus_client = true;
1055 /* We don't know whether the bus is trusted or not, so better
1056 * be safe, and authenticate everything */
1058 b->is_local = false;
1059 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1060 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1062 r = sd_bus_start(b);
1074 int bus_set_address_system(sd_bus *b) {
1078 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1080 return sd_bus_set_address(b, e);
1082 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1085 _public_ int sd_bus_open_system(sd_bus **ret) {
1089 assert_return(ret, -EINVAL);
1095 r = bus_set_address_system(b);
1099 b->bus_client = true;
1100 b->is_system = true;
1102 /* Let's do per-method access control on the system bus. We
1103 * need the caller's UID and capability set for that. */
1105 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1106 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1109 r = sd_bus_start(b);
1121 #if 0 /// elogind can not open/use a user bus
1122 int bus_set_address_user(sd_bus *b) {
1124 _cleanup_free_ char *ee = NULL, *s = NULL;
1128 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1130 return sd_bus_set_address(b, e);
1132 e = secure_getenv("XDG_RUNTIME_DIR");
1136 ee = bus_address_escape(e);
1140 if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, ee) < 0)
1150 _public_ int sd_bus_open_user(sd_bus **ret) {
1151 #if 0 /// elogind does not support user buses
1155 assert_return(ret, -EINVAL);
1161 r = bus_set_address_user(b);
1165 b->bus_client = true;
1168 /* We don't do any per-method access control on the user
1173 r = sd_bus_start(b);
1184 return sd_bus_open_system(ret);
1188 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1189 _cleanup_free_ char *e = NULL;
1190 char *m = NULL, *c = NULL;
1195 /* Let's see if we shall enter some container */
1196 m = strchr(host, ':');
1200 /* Let's make sure this is not a port of some kind,
1201 * and is a valid machine name. */
1202 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1205 /* Cut out the host part */
1206 t = strndupa(host, m - host - 1);
1207 e = bus_address_escape(t);
1211 c = strjoina(",argv5=--machine=", m);
1216 e = bus_address_escape(host);
1221 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=systemd-stdio-bridge", c);
1228 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1232 assert_return(host, -EINVAL);
1233 assert_return(ret, -EINVAL);
1235 r = sd_bus_new(&bus);
1239 r = bus_set_address_system_remote(bus, host);
1243 bus->bus_client = true;
1244 bus->trusted = false;
1245 bus->is_system = true;
1246 bus->is_local = false;
1248 r = sd_bus_start(bus);
1260 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1261 _cleanup_free_ char *e = NULL;
1266 e = bus_address_escape(machine);
1270 b->address = strjoin("x-machine-unix:machine=", e);
1277 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1281 assert_return(machine, -EINVAL);
1282 assert_return(ret, -EINVAL);
1283 assert_return(machine_name_is_valid(machine), -EINVAL);
1285 r = sd_bus_new(&bus);
1289 r = bus_set_address_system_machine(bus, machine);
1293 bus->bus_client = true;
1294 bus->trusted = false;
1295 bus->is_system = true;
1296 bus->is_local = false;
1298 r = sd_bus_start(bus);
1310 _public_ void sd_bus_close(sd_bus *bus) {
1314 if (bus->state == BUS_CLOSED)
1316 if (bus_pid_changed(bus))
1319 bus->state = BUS_CLOSED;
1321 sd_bus_detach_event(bus);
1323 /* Drop all queued messages so that they drop references to
1324 * the bus object and the bus may be freed */
1325 bus_reset_queues(bus);
1330 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1338 return sd_bus_unref(bus);
1341 static void bus_enter_closing(sd_bus *bus) {
1344 if (bus->state != BUS_OPENING &&
1345 bus->state != BUS_AUTHENTICATING &&
1346 bus->state != BUS_HELLO &&
1347 bus->state != BUS_RUNNING)
1350 bus->state = BUS_CLOSING;
1353 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1358 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1363 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1369 i = REFCNT_DEC(bus->n_ref);
1377 #if 0 /// UNNEEDED by elogind
1378 _public_ int sd_bus_is_open(sd_bus *bus) {
1380 assert_return(bus, -EINVAL);
1381 assert_return(!bus_pid_changed(bus), -ECHILD);
1383 return BUS_IS_OPEN(bus->state);
1387 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1390 assert_return(bus, -EINVAL);
1391 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1392 assert_return(!bus_pid_changed(bus), -ECHILD);
1394 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1397 if (type == SD_BUS_TYPE_UNIX_FD) {
1398 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1401 r = bus_ensure_running(bus);
1405 return bus->can_fds;
1408 return bus_type_is_valid(type);
1411 #if 0 /// UNNEEDED by elogind
1412 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1415 assert_return(bus, -EINVAL);
1416 assert_return(id, -EINVAL);
1417 assert_return(!bus_pid_changed(bus), -ECHILD);
1419 r = bus_ensure_running(bus);
1423 *id = bus->server_id;
1428 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1433 /* If we copy the same message to multiple
1434 * destinations, avoid using the same cookie
1436 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1441 timeout = BUS_DEFAULT_TIMEOUT;
1443 return bus_message_seal(m, ++b->cookie, timeout);
1446 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1447 bool remarshal = false;
1451 /* wrong packet version */
1452 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1455 /* wrong packet endianness */
1456 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1459 return remarshal ? bus_message_remarshal(b, m) : 0;
1462 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1466 /* Fake some timestamps, if they were requested, and not
1467 * already initialized */
1468 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1469 if (m->realtime <= 0)
1470 m->realtime = now(CLOCK_REALTIME);
1472 if (m->monotonic <= 0)
1473 m->monotonic = now(CLOCK_MONOTONIC);
1476 /* The bus specification says the serial number cannot be 0,
1477 * hence let's fill something in for synthetic messages. Since
1478 * synthetic messages might have a fake sender and we don't
1479 * want to interfere with the real sender's serial numbers we
1480 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1481 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1482 * even though kdbus can do 64bit. */
1483 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1486 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1492 r = bus_socket_write_message(bus, m, idx);
1496 if (*idx >= BUS_MESSAGE_SIZE(m))
1497 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1498 bus_message_type_to_string(m->header->type),
1499 strna(sd_bus_message_get_sender(m)),
1500 strna(sd_bus_message_get_destination(m)),
1501 strna(sd_bus_message_get_path(m)),
1502 strna(sd_bus_message_get_interface(m)),
1503 strna(sd_bus_message_get_member(m)),
1504 BUS_MESSAGE_COOKIE(m),
1506 strna(m->error.message));
1511 static int dispatch_wqueue(sd_bus *bus) {
1515 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1517 while (bus->wqueue_size > 0) {
1519 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1523 /* Didn't do anything this time */
1525 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1526 /* Fully written. Let's drop the entry from
1529 * This isn't particularly optimized, but
1530 * well, this is supposed to be our worst-case
1531 * buffer only, and the socket buffer is
1532 * supposed to be our primary buffer, and if
1533 * it got full, then all bets are off
1537 sd_bus_message_unref(bus->wqueue[0]);
1538 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1548 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1551 return bus_socket_read_message(bus);
1554 int bus_rqueue_make_room(sd_bus *bus) {
1557 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1560 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1566 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1571 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1573 /* Note that the priority logic is only available on kdbus,
1574 * where the rqueue is unused. We check the rqueue here
1575 * anyway, because it's simple... */
1578 if (bus->rqueue_size > 0) {
1579 /* Dispatch a queued message */
1581 *m = bus->rqueue[0];
1583 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1587 /* Try to read a new message */
1588 r = bus_read_message(bus, hint_priority, priority);
1598 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1599 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1602 assert_return(m, -EINVAL);
1607 assert_return(!bus_pid_changed(bus), -ECHILD);
1609 if (!BUS_IS_OPEN(bus->state))
1613 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1620 /* If the cookie number isn't kept, then we know that no reply
1622 if (!cookie && !m->sealed)
1623 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1625 r = bus_seal_message(bus, m, 0);
1629 /* Remarshall if we have to. This will possibly unref the
1630 * message and place a replacement in m */
1631 r = bus_remarshal_message(bus, &m);
1635 /* If this is a reply and no reply was requested, then let's
1636 * suppress this, if we can */
1640 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1643 r = bus_write_message(bus, m, hint_sync_call, &idx);
1645 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1646 bus_enter_closing(bus);
1653 if (idx < BUS_MESSAGE_SIZE(m)) {
1654 /* Wasn't fully written. So let's remember how
1655 * much was written. Note that the first entry
1656 * of the wqueue array is always allocated so
1657 * that we always can remember how much was
1659 bus->wqueue[0] = sd_bus_message_ref(m);
1660 bus->wqueue_size = 1;
1665 /* Just append it to the queue. */
1667 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1670 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1673 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1678 *cookie = BUS_MESSAGE_COOKIE(m);
1683 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1684 return bus_send_internal(bus, m, cookie, false);
1687 #if 0 /// UNNEEDED by elogind
1688 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1691 assert_return(m, -EINVAL);
1696 assert_return(!bus_pid_changed(bus), -ECHILD);
1698 if (!BUS_IS_OPEN(bus->state))
1701 if (!streq_ptr(m->destination, destination)) {
1706 r = sd_bus_message_set_destination(m, destination);
1711 return sd_bus_send(bus, m, cookie);
1715 static usec_t calc_elapse(uint64_t usec) {
1716 if (usec == (uint64_t) -1)
1719 return now(CLOCK_MONOTONIC) + usec;
1722 static int timeout_compare(const void *a, const void *b) {
1723 const struct reply_callback *x = a, *y = b;
1725 if (x->timeout != 0 && y->timeout == 0)
1728 if (x->timeout == 0 && y->timeout != 0)
1731 if (x->timeout < y->timeout)
1734 if (x->timeout > y->timeout)
1740 _public_ int sd_bus_call_async(
1744 sd_bus_message_handler_t callback,
1748 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1749 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1752 assert_return(m, -EINVAL);
1753 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1754 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1755 assert_return(callback, -EINVAL);
1760 assert_return(!bus_pid_changed(bus), -ECHILD);
1762 if (!BUS_IS_OPEN(bus->state))
1765 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1769 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1773 r = bus_seal_message(bus, m, usec);
1777 r = bus_remarshal_message(bus, &m);
1781 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1785 s->reply_callback.callback = callback;
1787 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1788 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1790 s->reply_callback.cookie = 0;
1794 s->reply_callback.timeout = calc_elapse(m->timeout);
1795 if (s->reply_callback.timeout != 0) {
1796 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1798 s->reply_callback.timeout = 0;
1803 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1814 int bus_ensure_running(sd_bus *bus) {
1819 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1821 if (bus->state == BUS_RUNNING)
1825 r = sd_bus_process(bus, NULL);
1828 if (bus->state == BUS_RUNNING)
1833 r = sd_bus_wait(bus, (uint64_t) -1);
1839 _public_ int sd_bus_call(
1843 sd_bus_error *error,
1844 sd_bus_message **reply) {
1846 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1852 bus_assert_return(m, -EINVAL, error);
1853 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
1854 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
1855 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
1860 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
1862 if (!BUS_IS_OPEN(bus->state)) {
1867 r = bus_ensure_running(bus);
1871 i = bus->rqueue_size;
1873 r = bus_seal_message(bus, m, usec);
1877 r = bus_remarshal_message(bus, &m);
1881 r = bus_send_internal(bus, m, &cookie, true);
1885 timeout = calc_elapse(m->timeout);
1890 while (i < bus->rqueue_size) {
1891 sd_bus_message *incoming = NULL;
1893 incoming = bus->rqueue[i];
1895 if (incoming->reply_cookie == cookie) {
1896 /* Found a match! */
1898 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1900 log_debug_bus_message(incoming);
1902 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
1904 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
1908 sd_bus_message_unref(incoming);
1913 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
1914 sd_bus_message_unref(incoming);
1917 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
1918 r = sd_bus_error_copy(error, &incoming->error);
1919 sd_bus_message_unref(incoming);
1926 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
1929 streq(bus->unique_name, incoming->sender)) {
1931 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1934 /* Our own message? Somebody is trying
1935 * to send its own client a message,
1936 * let's not dead-lock, let's fail
1939 sd_bus_message_unref(incoming);
1944 /* Try to read more, right-away */
1948 r = bus_read_message(bus, false, 0);
1950 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1951 bus_enter_closing(bus);
1963 n = now(CLOCK_MONOTONIC);
1971 left = (uint64_t) -1;
1973 r = bus_poll(bus, true, left);
1981 r = dispatch_wqueue(bus);
1983 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1984 bus_enter_closing(bus);
1993 return sd_bus_error_set_errno(error, r);
1996 #if 0 /// UNNEEDED by elogind
1997 _public_ int sd_bus_get_fd(sd_bus *bus) {
1999 assert_return(bus, -EINVAL);
2000 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2001 assert_return(!bus_pid_changed(bus), -ECHILD);
2003 return bus->input_fd;
2007 _public_ int sd_bus_get_events(sd_bus *bus) {
2010 assert_return(bus, -EINVAL);
2011 assert_return(!bus_pid_changed(bus), -ECHILD);
2013 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2016 if (bus->state == BUS_OPENING)
2018 else if (bus->state == BUS_AUTHENTICATING) {
2020 if (bus_socket_auth_needs_write(bus))
2025 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2026 if (bus->rqueue_size <= 0)
2028 if (bus->wqueue_size > 0)
2035 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2036 struct reply_callback *c;
2038 assert_return(bus, -EINVAL);
2039 assert_return(timeout_usec, -EINVAL);
2040 assert_return(!bus_pid_changed(bus), -ECHILD);
2042 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2045 if (bus->track_queue) {
2050 if (bus->state == BUS_CLOSING) {
2055 if (bus->state == BUS_AUTHENTICATING) {
2056 *timeout_usec = bus->auth_timeout;
2060 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2061 *timeout_usec = (uint64_t) -1;
2065 if (bus->rqueue_size > 0) {
2070 c = prioq_peek(bus->reply_callbacks_prioq);
2072 *timeout_usec = (uint64_t) -1;
2076 if (c->timeout == 0) {
2077 *timeout_usec = (uint64_t) -1;
2081 *timeout_usec = c->timeout;
2085 static int process_timeout(sd_bus *bus) {
2086 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2087 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2088 struct reply_callback *c;
2095 c = prioq_peek(bus->reply_callbacks_prioq);
2099 n = now(CLOCK_MONOTONIC);
2103 r = bus_message_new_synthetic_error(
2106 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2111 r = bus_seal_synthetic_message(bus, m);
2115 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2118 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2121 slot = container_of(c, sd_bus_slot, reply_callback);
2123 bus->iteration_counter++;
2125 bus->current_message = m;
2126 bus->current_slot = sd_bus_slot_ref(slot);
2127 bus->current_handler = c->callback;
2128 bus->current_userdata = slot->userdata;
2129 r = c->callback(m, slot->userdata, &error_buffer);
2130 bus->current_userdata = NULL;
2131 bus->current_handler = NULL;
2132 bus->current_slot = NULL;
2133 bus->current_message = NULL;
2135 if (slot->floating) {
2136 bus_slot_disconnect(slot);
2137 sd_bus_slot_unref(slot);
2140 sd_bus_slot_unref(slot);
2142 return bus_maybe_reply_error(m, r, &error_buffer);
2145 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2149 if (bus->state != BUS_HELLO)
2152 /* Let's make sure the first message on the bus is the HELLO
2153 * reply. But note that we don't actually parse the message
2154 * here (we leave that to the usual handling), we just verify
2155 * we don't let any earlier msg through. */
2157 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2158 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2161 if (m->reply_cookie != 1)
2167 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2168 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2169 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2170 struct reply_callback *c;
2177 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2178 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2181 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2184 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2190 slot = container_of(c, sd_bus_slot, reply_callback);
2192 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2194 /* If the reply contained a file descriptor which we
2195 * didn't want we pass an error instead. */
2197 r = bus_message_new_synthetic_error(
2200 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2205 /* Copy over original timestamp */
2206 synthetic_reply->realtime = m->realtime;
2207 synthetic_reply->monotonic = m->monotonic;
2208 synthetic_reply->seqnum = m->seqnum;
2210 r = bus_seal_synthetic_message(bus, synthetic_reply);
2214 m = synthetic_reply;
2216 r = sd_bus_message_rewind(m, true);
2221 if (c->timeout != 0) {
2222 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2226 bus->current_slot = sd_bus_slot_ref(slot);
2227 bus->current_handler = c->callback;
2228 bus->current_userdata = slot->userdata;
2229 r = c->callback(m, slot->userdata, &error_buffer);
2230 bus->current_userdata = NULL;
2231 bus->current_handler = NULL;
2232 bus->current_slot = NULL;
2234 if (slot->floating) {
2235 bus_slot_disconnect(slot);
2236 sd_bus_slot_unref(slot);
2239 sd_bus_slot_unref(slot);
2241 return bus_maybe_reply_error(m, r, &error_buffer);
2244 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2245 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2246 struct filter_callback *l;
2253 bus->filter_callbacks_modified = false;
2255 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2258 if (bus->filter_callbacks_modified)
2261 /* Don't run this more than once per iteration */
2262 if (l->last_iteration == bus->iteration_counter)
2265 l->last_iteration = bus->iteration_counter;
2267 r = sd_bus_message_rewind(m, true);
2271 slot = container_of(l, sd_bus_slot, filter_callback);
2273 bus->current_slot = sd_bus_slot_ref(slot);
2274 bus->current_handler = l->callback;
2275 bus->current_userdata = slot->userdata;
2276 r = l->callback(m, slot->userdata, &error_buffer);
2277 bus->current_userdata = NULL;
2278 bus->current_handler = NULL;
2279 bus->current_slot = sd_bus_slot_unref(slot);
2281 r = bus_maybe_reply_error(m, r, &error_buffer);
2287 } while (bus->filter_callbacks_modified);
2292 static int process_match(sd_bus *bus, sd_bus_message *m) {
2299 bus->match_callbacks_modified = false;
2301 r = bus_match_run(bus, &bus->match_callbacks, m);
2305 } while (bus->match_callbacks_modified);
2310 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2311 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2317 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2320 if (bus->manual_peer_interface)
2323 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2326 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2329 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2332 if (streq_ptr(m->member, "Ping"))
2333 r = sd_bus_message_new_method_return(m, &reply);
2334 else if (streq_ptr(m->member, "GetMachineId")) {
2338 r = sd_id128_get_machine(&id);
2342 r = sd_bus_message_new_method_return(m, &reply);
2346 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2348 r = sd_bus_message_new_method_errorf(
2350 SD_BUS_ERROR_UNKNOWN_METHOD,
2351 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2357 r = sd_bus_send(bus, reply, NULL);
2364 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2368 /* If we got a message with a file descriptor which we didn't
2369 * want to accept, then let's drop it. How can this even
2370 * happen? For example, when the kernel queues a message into
2371 * an activatable names's queue which allows fds, and then is
2372 * delivered to us later even though we ourselves did not
2375 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2381 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2384 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2385 return 1; /* just eat it up */
2387 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2390 static int process_message(sd_bus *bus, sd_bus_message *m) {
2396 bus->current_message = m;
2397 bus->iteration_counter++;
2399 log_debug_bus_message(m);
2401 r = process_hello(bus, m);
2405 r = process_reply(bus, m);
2409 r = process_fd_check(bus, m);
2413 r = process_filter(bus, m);
2417 r = process_match(bus, m);
2421 r = process_builtin(bus, m);
2425 r = bus_process_object(bus, m);
2428 bus->current_message = NULL;
2432 static int dispatch_track(sd_bus *bus) {
2435 if (!bus->track_queue)
2438 bus_track_dispatch(bus->track_queue);
2442 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2443 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2447 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2449 r = process_timeout(bus);
2453 r = dispatch_wqueue(bus);
2457 r = dispatch_track(bus);
2461 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2467 r = process_message(bus, m);
2472 r = sd_bus_message_rewind(m, true);
2481 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2483 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2484 strna(sd_bus_message_get_sender(m)),
2485 strna(sd_bus_message_get_path(m)),
2486 strna(sd_bus_message_get_interface(m)),
2487 strna(sd_bus_message_get_member(m)));
2489 r = sd_bus_reply_method_errorf(
2491 SD_BUS_ERROR_UNKNOWN_OBJECT,
2492 "Unknown object '%s'.", m->path);
2506 static int bus_exit_now(sd_bus *bus) {
2509 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2510 * sd_event_exit(), otherwise invokes libc exit(). */
2512 if (bus->exited) /* did we already exit? */
2514 if (!bus->exit_triggered) /* was the exit condition triggered? */
2516 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2519 bus->exited = true; /* never exit more than once */
2521 log_debug("Bus connection disconnected, exiting.");
2524 return sd_event_exit(bus->event, EXIT_FAILURE);
2528 assert_not_reached("exit() didn't exit?");
2531 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2532 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2533 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2540 r = bus_message_new_synthetic_error(
2543 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2548 r = bus_seal_synthetic_message(bus, m);
2552 if (c->timeout != 0) {
2553 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2557 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2560 slot = container_of(c, sd_bus_slot, reply_callback);
2562 bus->iteration_counter++;
2564 bus->current_message = m;
2565 bus->current_slot = sd_bus_slot_ref(slot);
2566 bus->current_handler = c->callback;
2567 bus->current_userdata = slot->userdata;
2568 r = c->callback(m, slot->userdata, &error_buffer);
2569 bus->current_userdata = NULL;
2570 bus->current_handler = NULL;
2571 bus->current_slot = NULL;
2572 bus->current_message = NULL;
2574 if (slot->floating) {
2575 bus_slot_disconnect(slot);
2576 sd_bus_slot_unref(slot);
2579 sd_bus_slot_unref(slot);
2581 return bus_maybe_reply_error(m, r, &error_buffer);
2584 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2585 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2586 struct reply_callback *c;
2590 assert(bus->state == BUS_CLOSING);
2592 /* First, fail all outstanding method calls */
2593 c = ordered_hashmap_first(bus->reply_callbacks);
2595 return process_closing_reply_callback(bus, c);
2597 /* Then, fake-drop all remaining bus tracking references */
2599 bus_track_close(bus->tracks);
2603 /* Then, synthesize a Disconnected message */
2604 r = sd_bus_message_new_signal(
2607 "/org/freedesktop/DBus/Local",
2608 "org.freedesktop.DBus.Local",
2613 bus_message_set_sender_local(bus, m);
2615 r = bus_seal_synthetic_message(bus, m);
2621 bus->current_message = m;
2622 bus->iteration_counter++;
2624 r = process_filter(bus, m);
2628 r = process_match(bus, m);
2632 /* Nothing else to do, exit now, if the condition holds */
2633 bus->exit_triggered = true;
2634 (void) bus_exit_now(bus);
2644 bus->current_message = NULL;
2649 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2650 BUS_DONT_DESTROY(bus);
2653 /* Returns 0 when we didn't do anything. This should cause the
2654 * caller to invoke sd_bus_wait() before returning the next
2655 * time. Returns > 0 when we did something, which possibly
2656 * means *ret is filled in with an unprocessed message. */
2658 assert_return(bus, -EINVAL);
2659 assert_return(!bus_pid_changed(bus), -ECHILD);
2661 /* We don't allow recursively invoking sd_bus_process(). */
2662 assert_return(!bus->current_message, -EBUSY);
2663 assert(!bus->current_slot);
2665 switch (bus->state) {
2674 r = bus_socket_process_opening(bus);
2675 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2676 bus_enter_closing(bus);
2684 case BUS_AUTHENTICATING:
2685 r = bus_socket_process_authenticating(bus);
2686 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2687 bus_enter_closing(bus);
2699 r = process_running(bus, hint_priority, priority, ret);
2700 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2701 bus_enter_closing(bus);
2711 return process_closing(bus, ret);
2714 assert_not_reached("Unknown state");
2717 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2718 return bus_process_internal(bus, false, 0, ret);
2721 #if 0 /// UNNEEDED by elogind
2722 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2723 return bus_process_internal(bus, true, priority, ret);
2727 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2728 struct pollfd p[2] = {};
2731 usec_t m = USEC_INFINITY;
2735 if (bus->state == BUS_CLOSING)
2738 if (!BUS_IS_OPEN(bus->state))
2741 e = sd_bus_get_events(bus);
2746 /* The caller really needs some more data, he doesn't
2747 * care about what's already read, or any timeouts
2748 * except its own. */
2752 /* The caller wants to process if there's something to
2753 * process, but doesn't care otherwise */
2755 r = sd_bus_get_timeout(bus, &until);
2760 nw = now(CLOCK_MONOTONIC);
2761 m = until > nw ? until - nw : 0;
2765 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2768 p[0].fd = bus->input_fd;
2769 if (bus->output_fd == bus->input_fd) {
2773 p[0].events = e & POLLIN;
2774 p[1].fd = bus->output_fd;
2775 p[1].events = e & POLLOUT;
2779 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2783 return r > 0 ? 1 : 0;
2786 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2788 assert_return(bus, -EINVAL);
2789 assert_return(!bus_pid_changed(bus), -ECHILD);
2791 if (bus->state == BUS_CLOSING)
2794 if (!BUS_IS_OPEN(bus->state))
2797 if (bus->rqueue_size > 0)
2800 return bus_poll(bus, false, timeout_usec);
2803 _public_ int sd_bus_flush(sd_bus *bus) {
2806 assert_return(bus, -EINVAL);
2807 assert_return(!bus_pid_changed(bus), -ECHILD);
2809 if (bus->state == BUS_CLOSING)
2812 if (!BUS_IS_OPEN(bus->state))
2815 r = bus_ensure_running(bus);
2819 if (bus->wqueue_size <= 0)
2823 r = dispatch_wqueue(bus);
2825 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2826 bus_enter_closing(bus);
2833 if (bus->wqueue_size <= 0)
2836 r = bus_poll(bus, false, (uint64_t) -1);
2842 #if 0 /// UNNEEDED by elogind
2843 _public_ int sd_bus_add_filter(
2846 sd_bus_message_handler_t callback,
2851 assert_return(bus, -EINVAL);
2852 assert_return(callback, -EINVAL);
2853 assert_return(!bus_pid_changed(bus), -ECHILD);
2855 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
2859 s->filter_callback.callback = callback;
2861 bus->filter_callbacks_modified = true;
2862 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
2871 _public_ int sd_bus_add_match(
2875 sd_bus_message_handler_t callback,
2878 struct bus_match_component *components = NULL;
2879 unsigned n_components = 0;
2880 sd_bus_slot *s = NULL;
2883 assert_return(bus, -EINVAL);
2884 assert_return(match, -EINVAL);
2885 assert_return(!bus_pid_changed(bus), -ECHILD);
2887 r = bus_match_parse(match, &components, &n_components);
2891 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
2897 s->match_callback.callback = callback;
2898 s->match_callback.cookie = ++bus->match_cookie;
2900 if (bus->bus_client) {
2901 enum bus_match_scope scope;
2903 scope = bus_match_get_scope(components, n_components);
2905 /* Do not install server-side matches for matches
2906 * against the local service, interface or bus path. */
2907 if (scope != BUS_MATCH_LOCAL) {
2909 /* We store the original match string, so that
2910 * we can use it to remove the match again. */
2912 s->match_callback.match_string = strdup(match);
2913 if (!s->match_callback.match_string) {
2918 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
2922 s->match_added = true;
2926 bus->match_callbacks_modified = true;
2927 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
2936 bus_match_parse_free(components, n_components);
2937 sd_bus_slot_unref(s);
2942 #if 0 /// UNNEEDED by elogind
2943 int bus_remove_match_by_string(
2946 sd_bus_message_handler_t callback,
2949 struct bus_match_component *components = NULL;
2950 unsigned n_components = 0;
2951 struct match_callback *c;
2954 assert_return(bus, -EINVAL);
2955 assert_return(match, -EINVAL);
2956 assert_return(!bus_pid_changed(bus), -ECHILD);
2958 r = bus_match_parse(match, &components, &n_components);
2962 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
2966 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
2969 bus_match_parse_free(components, n_components);
2975 bool bus_pid_changed(sd_bus *bus) {
2978 /* We don't support people creating a bus connection and
2979 * keeping it around over a fork(). Let's complain. */
2981 return bus->original_pid != getpid_cached();
2984 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
2985 sd_bus *bus = userdata;
2990 r = sd_bus_process(bus, NULL);
2997 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
2998 sd_bus *bus = userdata;
3003 r = sd_bus_process(bus, NULL);
3010 static int prepare_callback(sd_event_source *s, void *userdata) {
3011 sd_bus *bus = userdata;
3018 e = sd_bus_get_events(bus);
3022 if (bus->output_fd != bus->input_fd) {
3024 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3028 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3032 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3037 r = sd_bus_get_timeout(bus, &until);
3043 j = sd_event_source_set_time(bus->time_event_source, until);
3048 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3055 static int quit_callback(sd_event_source *event, void *userdata) {
3056 sd_bus *bus = userdata;
3066 static int attach_io_events(sd_bus *bus) {
3071 if (bus->input_fd < 0)
3077 if (!bus->input_io_event_source) {
3078 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3082 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3086 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3090 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3092 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3097 if (bus->output_fd != bus->input_fd) {
3098 assert(bus->output_fd >= 0);
3100 if (!bus->output_io_event_source) {
3101 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3105 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3109 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3111 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3120 static void detach_io_events(sd_bus *bus) {
3123 if (bus->input_io_event_source) {
3124 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3125 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3128 if (bus->output_io_event_source) {
3129 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3130 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3134 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3137 assert_return(bus, -EINVAL);
3138 assert_return(!bus->event, -EBUSY);
3140 assert(!bus->input_io_event_source);
3141 assert(!bus->output_io_event_source);
3142 assert(!bus->time_event_source);
3145 bus->event = sd_event_ref(event);
3147 r = sd_event_default(&bus->event);
3152 bus->event_priority = priority;
3154 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3158 r = sd_event_source_set_priority(bus->time_event_source, priority);
3162 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3166 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3170 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3174 r = attach_io_events(bus);
3181 sd_bus_detach_event(bus);
3185 _public_ int sd_bus_detach_event(sd_bus *bus) {
3186 assert_return(bus, -EINVAL);
3191 detach_io_events(bus);
3193 if (bus->time_event_source) {
3194 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3195 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3198 if (bus->quit_event_source) {
3199 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3200 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3203 bus->event = sd_event_unref(bus->event);
3207 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3208 assert_return(bus, NULL);
3213 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3214 assert_return(bus, NULL);
3216 return bus->current_message;
3219 #if 0 /// UNNEEDED by elogind
3220 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3221 assert_return(bus, NULL);
3223 return bus->current_slot;
3227 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3228 assert_return(bus, NULL);
3230 return bus->current_handler;
3233 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3234 assert_return(bus, NULL);
3236 return bus->current_userdata;
3239 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3244 assert(default_bus);
3247 return !!*default_bus;
3250 *ret = sd_bus_ref(*default_bus);
3258 b->default_bus_ptr = default_bus;
3266 _public_ int sd_bus_default_system(sd_bus **ret) {
3267 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3271 _public_ int sd_bus_default_user(sd_bus **ret) {
3272 #if 0 /// elogind does not support user buses
3273 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3275 return sd_bus_default_system(ret);
3279 _public_ int sd_bus_default(sd_bus **ret) {
3283 /* Let's try our best to reuse another cached connection. If
3284 * the starter bus type is set, connect via our normal
3285 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3286 * we can share the connection with the user/system default
3289 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3291 if (streq(e, "system"))
3292 return sd_bus_default_system(ret);
3293 #if 0 /// elogind does not support systemd units
3294 else if (STR_IN_SET(e, "user", "session"))
3295 return sd_bus_default_user(ret);
3299 /* No type is specified, so we have not other option than to
3300 * use the starter address if it is set. */
3302 e = secure_getenv("DBUS_STARTER_ADDRESS");
3305 return bus_default(sd_bus_open, &default_starter_bus, ret);
3308 /* Finally, if nothing is set use the cached connection for
3309 * the right scope */
3311 #if 0 /// elogind does not support systemd units
3312 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3313 return sd_bus_default_user(ret);
3316 return sd_bus_default_system(ret);
3319 #if 0 /// UNNEEDED by elogind
3320 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3321 assert_return(b, -EINVAL);
3322 assert_return(tid, -EINVAL);
3323 assert_return(!bus_pid_changed(b), -ECHILD);
3331 return sd_event_get_tid(b->event, tid);
3336 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3337 _cleanup_free_ char *e = NULL;
3340 assert_return(object_path_is_valid(prefix), -EINVAL);
3341 assert_return(external_id, -EINVAL);
3342 assert_return(ret_path, -EINVAL);
3344 e = bus_label_escape(external_id);
3348 ret = strjoin(prefix, "/", e);
3356 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3360 assert_return(object_path_is_valid(path), -EINVAL);
3361 assert_return(object_path_is_valid(prefix), -EINVAL);
3362 assert_return(external_id, -EINVAL);
3364 e = object_path_startswith(path, prefix);
3366 *external_id = NULL;
3370 ret = bus_label_unescape(e);
3378 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3379 _cleanup_strv_free_ char **labels = NULL;
3380 char *path, *path_pos, **label_pos;
3381 const char *sep, *template_pos;
3386 assert_return(out, -EINVAL);
3387 assert_return(path_template, -EINVAL);
3389 path_length = strlen(path_template);
3391 va_start(list, path_template);
3392 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3396 arg = va_arg(list, const char *);
3402 label = bus_label_escape(arg);
3408 r = strv_consume(&labels, label);
3414 /* add label length, but account for the format character */
3415 path_length += strlen(label) - 1;
3419 path = malloc(path_length + 1);
3426 for (template_pos = path_template; *template_pos; ) {
3427 sep = strchrnul(template_pos, '%');
3428 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3432 path_pos = stpcpy(path_pos, *label_pos++);
3433 template_pos = sep + 1;
3441 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3442 _cleanup_strv_free_ char **labels = NULL;
3443 const char *template_pos, *path_pos;
3449 * This decodes an object-path based on a template argument. The
3450 * template consists of a verbatim path, optionally including special
3453 * - Each occurrence of '%' in the template matches an arbitrary
3454 * substring of a label in the given path. At most one such
3455 * directive is allowed per label. For each such directive, the
3456 * caller must provide an output parameter (char **) via va_arg. If
3457 * NULL is passed, the given label is verified, but not returned.
3458 * For each matched label, the *decoded* label is stored in the
3459 * passed output argument, and the caller is responsible to free
3460 * it. Note that the output arguments are only modified if the
3461 * actualy path matched the template. Otherwise, they're left
3464 * This function returns <0 on error, 0 if the path does not match the
3465 * template, 1 if it matched.
3468 assert_return(path, -EINVAL);
3469 assert_return(path_template, -EINVAL);
3473 for (template_pos = path_template; *template_pos; ) {
3478 /* verify everything until the next '%' matches verbatim */
3479 sep = strchrnul(template_pos, '%');
3480 length = sep - template_pos;
3481 if (strncmp(path_pos, template_pos, length))
3485 template_pos += length;
3490 /* We found the next '%' character. Everything up until here
3491 * matched. We now skip ahead to the end of this label and make
3492 * sure it matches the tail of the label in the path. Then we
3493 * decode the string in-between and save it for later use. */
3495 ++template_pos; /* skip over '%' */
3497 sep = strchrnul(template_pos, '/');
3498 length = sep - template_pos; /* length of suffix to match verbatim */
3500 /* verify the suffixes match */
3501 sep = strchrnul(path_pos, '/');
3502 if (sep - path_pos < (ssize_t)length ||
3503 strncmp(sep - length, template_pos, length))
3506 template_pos += length; /* skip over matched label */
3507 length = sep - path_pos - length; /* length of sub-label to decode */
3509 /* store unescaped label for later use */
3510 label = bus_label_unescape_n(path_pos, length);
3514 r = strv_consume(&labels, label);
3518 path_pos = sep; /* skip decoded label and suffix */
3521 /* end of template must match end of path */
3525 /* copy the labels over to the caller */
3526 va_start(list, path_template);
3527 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3530 arg = va_arg(list, char **);
3543 _public_ int sd_bus_try_close(sd_bus *bus) {
3544 assert_return(bus, -EINVAL);
3545 assert_return(!bus_pid_changed(bus), -ECHILD);
3550 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3551 assert_return(bus, -EINVAL);
3552 assert_return(description, -EINVAL);
3553 assert_return(bus->description, -ENXIO);
3554 assert_return(!bus_pid_changed(bus), -ECHILD);
3556 *description = bus->description;
3561 int bus_get_root_path(sd_bus *bus) {
3564 if (bus->cgroup_root)
3567 r = cg_get_root_path(&bus->cgroup_root);
3569 bus->cgroup_root = strdup("/");
3570 if (!bus->cgroup_root)
3579 #if 0 /// UNNEEDED by elogind
3580 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3581 assert_return(bus, -EINVAL);
3582 assert_return(scope, -EINVAL);
3583 assert_return(!bus_pid_changed(bus), -ECHILD);
3590 if (bus->is_system) {
3598 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3600 assert_return(bus, -EINVAL);
3601 assert_return(address, -EINVAL);
3602 assert_return(!bus_pid_changed(bus), -ECHILD);
3605 *address = bus->address;
3612 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3613 assert_return(bus, -EINVAL);
3614 assert_return(mask, -EINVAL);
3615 assert_return(!bus_pid_changed(bus), -ECHILD);
3617 *mask = bus->creds_mask;
3621 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3622 assert_return(bus, -EINVAL);
3623 assert_return(!bus_pid_changed(bus), -ECHILD);
3625 return bus->bus_client;
3628 _public_ int sd_bus_is_server(sd_bus *bus) {
3629 assert_return(bus, -EINVAL);
3630 assert_return(!bus_pid_changed(bus), -ECHILD);
3632 return bus->is_server;
3635 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3636 assert_return(bus, -EINVAL);
3637 assert_return(!bus_pid_changed(bus), -ECHILD);
3639 return bus->anonymous_auth;
3642 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3643 assert_return(bus, -EINVAL);
3644 assert_return(!bus_pid_changed(bus), -ECHILD);
3646 return bus->trusted;
3649 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3650 assert_return(bus, -EINVAL);
3651 assert_return(!bus_pid_changed(bus), -ECHILD);
3653 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3656 static void flush_close(sd_bus *bus) {
3660 /* Flushes and closes the specified bus. We take a ref before,
3661 * to ensure the flushing does not cause the bus to be
3664 sd_bus_flush_close_unref(sd_bus_ref(bus));
3667 _public_ void sd_bus_default_flush_close(void) {
3668 flush_close(default_starter_bus);
3669 flush_close(default_user_bus);
3670 flush_close(default_system_bus);
3674 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3675 assert_return(bus, -EINVAL);
3677 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3678 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3679 * from the client side. */
3680 bus->exit_on_disconnect = b;
3682 /* If the exit condition was triggered already, exit immediately. */
3683 return bus_exit_now(bus);
3686 #if 0 /// UNNEEDED by elogind
3687 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3688 assert_return(bus, -EINVAL);
3690 return bus->exit_on_disconnect;