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 static thread_local sd_bus
*default_user_bus
= NULL
;
77 static thread_local sd_bus
*default_starter_bus
= NULL
;
79 static void bus_close_fds(sd_bus
*b
) {
84 if (b
->input_fd
!= b
->output_fd
)
85 safe_close(b
->output_fd
);
86 b
->output_fd
= b
->input_fd
= safe_close(b
->input_fd
);
89 static void bus_reset_queues(sd_bus
*b
) {
92 while (b
->rqueue_size
> 0)
93 sd_bus_message_unref(b
->rqueue
[--b
->rqueue_size
]);
95 b
->rqueue
= mfree(b
->rqueue
);
96 b
->rqueue_allocated
= 0;
98 while (b
->wqueue_size
> 0)
99 sd_bus_message_unref(b
->wqueue
[--b
->wqueue_size
]);
101 b
->wqueue
= mfree(b
->wqueue
);
102 b
->wqueue_allocated
= 0;
105 static void bus_free(sd_bus
*b
) {
109 assert(!b
->track_queue
);
111 b
->state
= BUS_CLOSED
;
113 sd_bus_detach_event(b
);
115 while ((s
= b
->slots
)) {
116 /* At this point only floating slots can still be
117 * around, because the non-floating ones keep a
118 * reference to the bus, and we thus couldn't be
119 * destructing right now... We forcibly disconnect the
120 * slots here, so that they still can be referenced by
121 * apps, but are dead. */
124 bus_slot_disconnect(s
);
125 sd_bus_slot_unref(s
);
128 if (b
->default_bus_ptr
)
129 *b
->default_bus_ptr
= NULL
;
134 munmap(b
->kdbus_buffer
, KDBUS_POOL_SIZE
);
138 free(b
->unique_name
);
139 free(b
->auth_buffer
);
144 free(b
->cgroup_root
);
145 free(b
->description
);
148 strv_free(b
->exec_argv
);
150 close_many(b
->fds
, b
->n_fds
);
155 ordered_hashmap_free_free(b
->reply_callbacks
);
156 prioq_free(b
->reply_callbacks_prioq
);
158 assert(b
->match_callbacks
.type
== BUS_MATCH_ROOT
);
159 bus_match_free(&b
->match_callbacks
);
161 hashmap_free_free(b
->vtable_methods
);
162 hashmap_free_free(b
->vtable_properties
);
164 assert(hashmap_isempty(b
->nodes
));
165 hashmap_free(b
->nodes
);
167 bus_kernel_flush_memfd(b
);
169 assert_se(pthread_mutex_destroy(&b
->memfd_cache_mutex
) == 0);
174 _public_
int sd_bus_new(sd_bus
**ret
) {
177 assert_return(ret
, -EINVAL
);
183 r
->n_ref
= REFCNT_INIT
;
184 r
->input_fd
= r
->output_fd
= -1;
185 r
->message_version
= 1;
186 r
->creds_mask
|= SD_BUS_CREDS_WELL_KNOWN_NAMES
|SD_BUS_CREDS_UNIQUE_NAME
;
187 r
->hello_flags
|= KDBUS_HELLO_ACCEPT_FD
;
188 r
->attach_flags
|= KDBUS_ATTACH_NAMES
;
189 r
->original_pid
= getpid();
191 assert_se(pthread_mutex_init(&r
->memfd_cache_mutex
, NULL
) == 0);
193 /* We guarantee that wqueue always has space for at least one
195 if (!GREEDY_REALLOC(r
->wqueue
, r
->wqueue_allocated
, 1)) {
204 _public_
int sd_bus_set_address(sd_bus
*bus
, const char *address
) {
207 assert_return(bus
, -EINVAL
);
208 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
209 assert_return(address
, -EINVAL
);
210 assert_return(!bus_pid_changed(bus
), -ECHILD
);
222 _public_
int sd_bus_set_fd(sd_bus
*bus
, int input_fd
, int output_fd
) {
223 assert_return(bus
, -EINVAL
);
224 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
225 assert_return(input_fd
>= 0, -EBADF
);
226 assert_return(output_fd
>= 0, -EBADF
);
227 assert_return(!bus_pid_changed(bus
), -ECHILD
);
229 bus
->input_fd
= input_fd
;
230 bus
->output_fd
= output_fd
;
234 _public_
int sd_bus_set_exec(sd_bus
*bus
, const char *path
, char *const argv
[]) {
237 assert_return(bus
, -EINVAL
);
238 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
239 assert_return(path
, -EINVAL
);
240 assert_return(!strv_isempty(argv
), -EINVAL
);
241 assert_return(!bus_pid_changed(bus
), -ECHILD
);
253 free(bus
->exec_path
);
254 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 _public_
int sd_bus_set_monitor(sd_bus
*bus
, int b
) {
272 assert_return(bus
, -EINVAL
);
273 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
274 assert_return(!bus_pid_changed(bus
), -ECHILD
);
276 SET_FLAG(bus
->hello_flags
, KDBUS_HELLO_MONITOR
, b
);
280 _public_
int sd_bus_negotiate_fds(sd_bus
*bus
, int b
) {
281 assert_return(bus
, -EINVAL
);
282 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
283 assert_return(!bus_pid_changed(bus
), -ECHILD
);
285 SET_FLAG(bus
->hello_flags
, KDBUS_HELLO_ACCEPT_FD
, b
);
289 _public_
int sd_bus_negotiate_timestamp(sd_bus
*bus
, int b
) {
291 assert_return(bus
, -EINVAL
);
292 assert_return(!IN_SET(bus
->state
, BUS_CLOSING
, BUS_CLOSED
), -EPERM
);
293 assert_return(!bus_pid_changed(bus
), -ECHILD
);
295 new_flags
= bus
->attach_flags
;
296 SET_FLAG(new_flags
, KDBUS_ATTACH_TIMESTAMP
, b
);
298 if (bus
->attach_flags
== new_flags
)
301 bus
->attach_flags
= new_flags
;
302 if (bus
->state
!= BUS_UNSET
&& bus
->is_kernel
)
303 bus_kernel_realize_attach_flags(bus
);
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
;
327 if (bus
->state
!= BUS_UNSET
&& bus
->is_kernel
)
328 bus_kernel_realize_attach_flags(bus
);
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 _public_
int sd_bus_set_trusted(sd_bus
*bus
, int b
) {
354 assert_return(bus
, -EINVAL
);
355 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
356 assert_return(!bus_pid_changed(bus
), -ECHILD
);
362 _public_
int sd_bus_set_description(sd_bus
*bus
, const char *description
) {
363 assert_return(bus
, -EINVAL
);
364 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
365 assert_return(!bus_pid_changed(bus
), -ECHILD
);
367 return free_and_strdup(&bus
->description
, description
);
370 _public_
int sd_bus_set_allow_interactive_authorization(sd_bus
*bus
, int b
) {
371 assert_return(bus
, -EINVAL
);
372 assert_return(!bus_pid_changed(bus
), -ECHILD
);
374 bus
->allow_interactive_authorization
= !!b
;
378 _public_
int sd_bus_get_allow_interactive_authorization(sd_bus
*bus
) {
379 assert_return(bus
, -EINVAL
);
380 assert_return(!bus_pid_changed(bus
), -ECHILD
);
382 return bus
->allow_interactive_authorization
;
385 static int hello_callback(sd_bus_message
*reply
, void *userdata
, sd_bus_error
*error
) {
393 assert(bus
->state
== BUS_HELLO
|| bus
->state
== BUS_CLOSING
);
395 r
= sd_bus_message_get_errno(reply
);
399 r
= sd_bus_message_read(reply
, "s", &s
);
403 if (!service_name_is_valid(s
) || s
[0] != ':')
406 bus
->unique_name
= strdup(s
);
407 if (!bus
->unique_name
)
410 if (bus
->state
== BUS_HELLO
)
411 bus
->state
= BUS_RUNNING
;
416 static int bus_send_hello(sd_bus
*bus
) {
417 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
422 if (!bus
->bus_client
|| bus
->is_kernel
)
425 r
= sd_bus_message_new_method_call(
428 "org.freedesktop.DBus",
429 "/org/freedesktop/DBus",
430 "org.freedesktop.DBus",
435 return sd_bus_call_async(bus
, NULL
, m
, hello_callback
, NULL
, 0);
438 int bus_start_running(sd_bus
*bus
) {
441 if (bus
->bus_client
&& !bus
->is_kernel
) {
442 bus
->state
= BUS_HELLO
;
446 bus
->state
= BUS_RUNNING
;
450 static int parse_address_key(const char **p
, const char *key
, char **value
) {
451 size_t l
, n
= 0, allocated
= 0;
461 if (strncmp(*p
, key
, l
) != 0)
474 while (*a
!= ';' && *a
!= ',' && *a
!= 0) {
492 c
= (char) ((x
<< 4) | y
);
499 if (!GREEDY_REALLOC(r
, allocated
, n
+ 2))
523 static void skip_address_key(const char **p
) {
527 *p
+= strcspn(*p
, ",");
533 static int parse_unix_address(sd_bus
*b
, const char **p
, char **guid
) {
534 _cleanup_free_
char *path
= NULL
, *abstract
= NULL
;
543 while (**p
!= 0 && **p
!= ';') {
544 r
= parse_address_key(p
, "guid", guid
);
550 r
= parse_address_key(p
, "path", &path
);
556 r
= parse_address_key(p
, "abstract", &abstract
);
565 if (!path
&& !abstract
)
568 if (path
&& abstract
)
573 if (l
> sizeof(b
->sockaddr
.un
.sun_path
))
576 b
->sockaddr
.un
.sun_family
= AF_UNIX
;
577 strncpy(b
->sockaddr
.un
.sun_path
, path
, sizeof(b
->sockaddr
.un
.sun_path
));
578 b
->sockaddr_size
= offsetof(struct sockaddr_un
, sun_path
) + l
;
579 } else if (abstract
) {
580 l
= strlen(abstract
);
581 if (l
> sizeof(b
->sockaddr
.un
.sun_path
) - 1)
584 b
->sockaddr
.un
.sun_family
= AF_UNIX
;
585 b
->sockaddr
.un
.sun_path
[0] = 0;
586 strncpy(b
->sockaddr
.un
.sun_path
+1, abstract
, sizeof(b
->sockaddr
.un
.sun_path
)-1);
587 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 (**p
!= 0 && **p
!= ';') {
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
);
660 static int parse_exec_address(sd_bus
*b
, const char **p
, char **guid
) {
662 unsigned n_argv
= 0, j
;
664 size_t allocated
= 0;
672 while (**p
!= 0 && **p
!= ';') {
673 r
= parse_address_key(p
, "guid", guid
);
679 r
= parse_address_key(p
, "path", &path
);
685 if (startswith(*p
, "argv")) {
689 ul
= strtoul(*p
+ 4, (char**) p
, 10);
690 if (errno
> 0 || **p
!= '=' || ul
> 256) {
698 if (!GREEDY_REALLOC0(argv
, allocated
, ul
+ 2)) {
706 r
= parse_address_key(p
, NULL
, argv
+ ul
);
721 /* Make sure there are no holes in the array, with the
722 * exception of argv[0] */
723 for (j
= 1; j
< n_argv
; j
++)
729 if (argv
&& argv
[0] == NULL
) {
730 argv
[0] = strdup(path
);
742 for (j
= 0; j
< n_argv
; j
++)
750 static int parse_kernel_address(sd_bus
*b
, const char **p
, char **guid
) {
751 _cleanup_free_
char *path
= NULL
;
759 while (**p
!= 0 && **p
!= ';') {
760 r
= parse_address_key(p
, "guid", guid
);
766 r
= parse_address_key(p
, "path", &path
);
785 static int parse_container_unix_address(sd_bus
*b
, const char **p
, char **guid
) {
786 _cleanup_free_
char *machine
= NULL
, *pid
= NULL
;
794 while (**p
!= 0 && **p
!= ';') {
795 r
= parse_address_key(p
, "guid", guid
);
801 r
= parse_address_key(p
, "machine", &machine
);
807 r
= parse_address_key(p
, "pid", &pid
);
816 if (!machine
== !pid
)
820 if (!machine_name_is_valid(machine
))
824 b
->machine
= machine
;
827 b
->machine
= mfree(b
->machine
);
831 r
= parse_pid(pid
, &b
->nspid
);
837 b
->sockaddr
.un
.sun_family
= AF_UNIX
;
838 strncpy(b
->sockaddr
.un
.sun_path
, "/var/run/dbus/system_bus_socket", sizeof(b
->sockaddr
.un
.sun_path
));
839 b
->sockaddr_size
= offsetof(struct sockaddr_un
, sun_path
) + strlen("/var/run/dbus/system_bus_socket");
844 static int parse_container_kernel_address(sd_bus
*b
, const char **p
, char **guid
) {
845 _cleanup_free_
char *machine
= NULL
, *pid
= NULL
;
853 while (**p
!= 0 && **p
!= ';') {
854 r
= parse_address_key(p
, "guid", guid
);
860 r
= parse_address_key(p
, "machine", &machine
);
866 r
= parse_address_key(p
, "pid", &pid
);
875 if (!machine
== !pid
)
879 if (!machine_name_is_valid(machine
))
883 b
->machine
= machine
;
886 b
->machine
= mfree(b
->machine
);
890 r
= parse_pid(pid
, &b
->nspid
);
896 r
= free_and_strdup(&b
->kernel
, "/sys/fs/kdbus/0-system/bus");
903 static void bus_reset_parsed_address(sd_bus
*b
) {
907 b
->sockaddr_size
= 0;
908 b
->exec_argv
= strv_free(b
->exec_argv
);
909 b
->exec_path
= mfree(b
->exec_path
);
910 b
->server_id
= SD_ID128_NULL
;
911 b
->kernel
= mfree(b
->kernel
);
912 b
->machine
= mfree(b
->machine
);
916 static int bus_parse_next_address(sd_bus
*b
) {
917 _cleanup_free_
char *guid
= NULL
;
925 if (b
->address
[b
->address_index
] == 0)
928 bus_reset_parsed_address(b
);
930 a
= b
->address
+ b
->address_index
;
939 if (startswith(a
, "unix:")) {
942 r
= parse_unix_address(b
, &a
, &guid
);
947 } else if (startswith(a
, "tcp:")) {
950 r
= parse_tcp_address(b
, &a
, &guid
);
956 } else if (startswith(a
, "unixexec:")) {
959 r
= parse_exec_address(b
, &a
, &guid
);
965 } else if (startswith(a
, "kernel:")) {
968 r
= parse_kernel_address(b
, &a
, &guid
);
973 } else if (startswith(a
, "x-machine-unix:")) {
976 r
= parse_container_unix_address(b
, &a
, &guid
);
981 } else if (startswith(a
, "x-machine-kernel:")) {
984 r
= parse_container_kernel_address(b
, &a
, &guid
);
997 r
= sd_id128_from_string(guid
, &b
->server_id
);
1002 b
->address_index
= a
- b
->address
;
1006 static int bus_start_address(sd_bus
*b
) {
1007 bool container_kdbus_available
= false;
1008 bool kdbus_available
= false;
1014 bool skipped
= false;
1019 * Usually, if you provide multiple different bus-addresses, we
1020 * try all of them in order. We use the first one that
1021 * succeeds. However, if you mix kernel and unix addresses, we
1022 * never try unix-addresses if a previous kernel address was
1023 * tried and kdbus was available. This is required to prevent
1024 * clients to fallback to the bus-proxy if kdbus is available
1025 * but failed (eg., too many connections).
1029 r
= bus_socket_exec(b
);
1030 else if ((b
->nspid
> 0 || b
->machine
) && b
->kernel
) {
1031 r
= bus_container_connect_kernel(b
);
1032 if (r
< 0 && !IN_SET(r
, -ENOENT
, -ESOCKTNOSUPPORT
))
1033 container_kdbus_available
= true;
1035 } else if ((b
->nspid
> 0 || b
->machine
) && b
->sockaddr
.sa
.sa_family
!= AF_UNSPEC
) {
1036 if (!container_kdbus_available
)
1037 r
= bus_container_connect_socket(b
);
1041 } else if (b
->kernel
) {
1042 r
= bus_kernel_connect(b
);
1043 if (r
< 0 && !IN_SET(r
, -ENOENT
, -ESOCKTNOSUPPORT
))
1044 kdbus_available
= true;
1046 } else if (b
->sockaddr
.sa
.sa_family
!= AF_UNSPEC
) {
1047 if (!kdbus_available
)
1048 r
= bus_socket_connect(b
);
1056 r
= attach_io_events(b
);
1061 b
->last_connect_error
= -r
;
1064 r
= bus_parse_next_address(b
);
1068 return b
->last_connect_error
? -b
->last_connect_error
: -ECONNREFUSED
;
1072 int bus_next_address(sd_bus
*b
) {
1075 bus_reset_parsed_address(b
);
1076 return bus_start_address(b
);
1079 static int bus_start_fd(sd_bus
*b
) {
1084 assert(b
->input_fd
>= 0);
1085 assert(b
->output_fd
>= 0);
1087 r
= fd_nonblock(b
->input_fd
, true);
1091 r
= fd_cloexec(b
->input_fd
, true);
1095 if (b
->input_fd
!= b
->output_fd
) {
1096 r
= fd_nonblock(b
->output_fd
, true);
1100 r
= fd_cloexec(b
->output_fd
, true);
1105 if (fstat(b
->input_fd
, &st
) < 0)
1108 if (S_ISCHR(b
->input_fd
))
1109 return bus_kernel_take_fd(b
);
1111 return bus_socket_take_fd(b
);
1114 _public_
int sd_bus_start(sd_bus
*bus
) {
1117 assert_return(bus
, -EINVAL
);
1118 assert_return(bus
->state
== BUS_UNSET
, -EPERM
);
1119 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1121 bus
->state
= BUS_OPENING
;
1123 if (bus
->is_server
&& bus
->bus_client
)
1126 if (bus
->input_fd
>= 0)
1127 r
= bus_start_fd(bus
);
1128 else if (bus
->address
|| bus
->sockaddr
.sa
.sa_family
!= AF_UNSPEC
|| bus
->exec_path
|| bus
->kernel
|| bus
->machine
)
1129 r
= bus_start_address(bus
);
1138 return bus_send_hello(bus
);
1141 _public_
int sd_bus_open(sd_bus
**ret
) {
1146 assert_return(ret
, -EINVAL
);
1148 /* Let's connect to the starter bus if it is set, and
1149 * otherwise to the bus that is appropropriate for the scope
1150 * we are running in */
1152 e
= secure_getenv("DBUS_STARTER_BUS_TYPE");
1154 if (streq(e
, "system"))
1155 return sd_bus_open_system(ret
);
1156 else if (STR_IN_SET(e
, "session", "user"))
1157 return sd_bus_open_user(ret
);
1160 e
= secure_getenv("DBUS_STARTER_ADDRESS");
1162 if (cg_pid_get_owner_uid(0, NULL
) >= 0)
1163 return sd_bus_open_user(ret
);
1165 return sd_bus_open_system(ret
);
1172 r
= sd_bus_set_address(b
, e
);
1176 b
->bus_client
= true;
1178 /* We don't know whether the bus is trusted or not, so better
1179 * be safe, and authenticate everything */
1181 b
->attach_flags
|= KDBUS_ATTACH_CAPS
| KDBUS_ATTACH_CREDS
;
1182 b
->creds_mask
|= SD_BUS_CREDS_UID
| SD_BUS_CREDS_EUID
| SD_BUS_CREDS_EFFECTIVE_CAPS
;
1184 r
= sd_bus_start(b
);
1196 int bus_set_address_system(sd_bus
*b
) {
1200 e
= secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1202 return sd_bus_set_address(b
, e
);
1204 return sd_bus_set_address(b
, DEFAULT_SYSTEM_BUS_ADDRESS
);
1207 _public_
int sd_bus_open_system(sd_bus
**ret
) {
1211 assert_return(ret
, -EINVAL
);
1217 r
= bus_set_address_system(b
);
1221 b
->bus_client
= true;
1222 b
->is_system
= true;
1224 /* Let's do per-method access control on the system bus. We
1225 * need the caller's UID and capability set for that. */
1227 b
->attach_flags
|= KDBUS_ATTACH_CAPS
| KDBUS_ATTACH_CREDS
;
1228 b
->creds_mask
|= SD_BUS_CREDS_UID
| SD_BUS_CREDS_EUID
| SD_BUS_CREDS_EFFECTIVE_CAPS
;
1230 r
= sd_bus_start(b
);
1242 int bus_set_address_user(sd_bus
*b
) {
1249 e
= secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1251 return sd_bus_set_address(b
, e
);
1253 r
= cg_pid_get_owner_uid(0, &uid
);
1257 e
= secure_getenv("XDG_RUNTIME_DIR");
1259 _cleanup_free_
char *ee
= NULL
;
1261 ee
= bus_address_escape(e
);
1265 (void) asprintf(&b
->address
, KERNEL_USER_BUS_ADDRESS_FMT
";" UNIX_USER_BUS_ADDRESS_FMT
, uid
, ee
);
1267 (void) asprintf(&b
->address
, KERNEL_USER_BUS_ADDRESS_FMT
, uid
);
1275 _public_
int sd_bus_open_user(sd_bus
**ret
) {
1279 assert_return(ret
, -EINVAL
);
1285 r
= bus_set_address_user(b
);
1289 b
->bus_client
= true;
1292 /* We don't do any per-method access control on the user
1296 r
= sd_bus_start(b
);
1308 int bus_set_address_system_remote(sd_bus
*b
, const char *host
) {
1309 _cleanup_free_
char *e
= NULL
;
1310 char *m
= NULL
, *c
= NULL
;
1315 /* Let's see if we shall enter some container */
1316 m
= strchr(host
, ':');
1320 /* Let's make sure this is not a port of some kind,
1321 * and is a valid machine name. */
1322 if (!in_charset(m
, "0123456789") && machine_name_is_valid(m
)) {
1325 /* Cut out the host part */
1326 t
= strndupa(host
, m
- host
- 1);
1327 e
= bus_address_escape(t
);
1331 c
= strjoina(",argv4=--machine=", m
);
1336 e
= bus_address_escape(host
);
1341 b
->address
= strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e
, ",argv3=systemd-stdio-bridge", c
, NULL
);
1348 _public_
int sd_bus_open_system_remote(sd_bus
**ret
, const char *host
) {
1352 assert_return(host
, -EINVAL
);
1353 assert_return(ret
, -EINVAL
);
1355 r
= sd_bus_new(&bus
);
1359 r
= bus_set_address_system_remote(bus
, host
);
1363 bus
->bus_client
= true;
1364 bus
->trusted
= false;
1365 bus
->is_system
= true;
1367 r
= sd_bus_start(bus
);
1379 int bus_set_address_system_machine(sd_bus
*b
, const char *machine
) {
1380 _cleanup_free_
char *e
= NULL
;
1385 e
= bus_address_escape(machine
);
1389 b
->address
= strjoin("x-machine-kernel:machine=", e
, ";x-machine-unix:machine=", e
, NULL
);
1396 _public_
int sd_bus_open_system_machine(sd_bus
**ret
, const char *machine
) {
1400 assert_return(machine
, -EINVAL
);
1401 assert_return(ret
, -EINVAL
);
1402 assert_return(machine_name_is_valid(machine
), -EINVAL
);
1404 r
= sd_bus_new(&bus
);
1408 r
= bus_set_address_system_machine(bus
, machine
);
1412 bus
->bus_client
= true;
1413 bus
->trusted
= false;
1414 bus
->is_system
= true;
1416 r
= sd_bus_start(bus
);
1428 _public_
void sd_bus_close(sd_bus
*bus
) {
1432 if (bus
->state
== BUS_CLOSED
)
1434 if (bus_pid_changed(bus
))
1437 bus
->state
= BUS_CLOSED
;
1439 sd_bus_detach_event(bus
);
1441 /* Drop all queued messages so that they drop references to
1442 * the bus object and the bus may be freed */
1443 bus_reset_queues(bus
);
1445 if (!bus
->is_kernel
)
1448 /* We'll leave the fd open in case this is a kernel bus, since
1449 * there might still be memblocks around that reference this
1450 * bus, and they might need to invoke the KDBUS_CMD_FREE
1451 * ioctl on the fd when they are freed. */
1454 _public_ sd_bus
* sd_bus_flush_close_unref(sd_bus
*bus
) {
1462 return sd_bus_unref(bus
);
1465 static void bus_enter_closing(sd_bus
*bus
) {
1468 if (bus
->state
!= BUS_OPENING
&&
1469 bus
->state
!= BUS_AUTHENTICATING
&&
1470 bus
->state
!= BUS_HELLO
&&
1471 bus
->state
!= BUS_RUNNING
)
1474 bus
->state
= BUS_CLOSING
;
1477 _public_ sd_bus
*sd_bus_ref(sd_bus
*bus
) {
1482 assert_se(REFCNT_INC(bus
->n_ref
) >= 2);
1487 _public_ sd_bus
*sd_bus_unref(sd_bus
*bus
) {
1493 i
= REFCNT_DEC(bus
->n_ref
);
1501 _public_
int sd_bus_is_open(sd_bus
*bus
) {
1503 assert_return(bus
, -EINVAL
);
1504 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1506 return BUS_IS_OPEN(bus
->state
);
1509 _public_
int sd_bus_can_send(sd_bus
*bus
, char type
) {
1512 assert_return(bus
, -EINVAL
);
1513 assert_return(bus
->state
!= BUS_UNSET
, -ENOTCONN
);
1514 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1516 if (bus
->hello_flags
& KDBUS_HELLO_MONITOR
)
1519 if (type
== SD_BUS_TYPE_UNIX_FD
) {
1520 if (!(bus
->hello_flags
& KDBUS_HELLO_ACCEPT_FD
))
1523 r
= bus_ensure_running(bus
);
1527 return bus
->can_fds
;
1530 return bus_type_is_valid(type
);
1533 _public_
int sd_bus_get_bus_id(sd_bus
*bus
, sd_id128_t
*id
) {
1536 assert_return(bus
, -EINVAL
);
1537 assert_return(id
, -EINVAL
);
1538 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1540 r
= bus_ensure_running(bus
);
1544 *id
= bus
->server_id
;
1548 static int bus_seal_message(sd_bus
*b
, sd_bus_message
*m
, usec_t timeout
) {
1553 /* If we copy the same message to multiple
1554 * destinations, avoid using the same cookie
1556 b
->cookie
= MAX(b
->cookie
, BUS_MESSAGE_COOKIE(m
));
1561 timeout
= BUS_DEFAULT_TIMEOUT
;
1563 return bus_message_seal(m
, ++b
->cookie
, timeout
);
1566 static int bus_remarshal_message(sd_bus
*b
, sd_bus_message
**m
) {
1567 bool remarshal
= false;
1571 /* wrong packet version */
1572 if (b
->message_version
!= 0 && b
->message_version
!= (*m
)->header
->version
)
1575 /* wrong packet endianness */
1576 if (b
->message_endian
!= 0 && b
->message_endian
!= (*m
)->header
->endian
)
1579 /* TODO: kdbus-messages received from the kernel contain data which is
1580 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1581 * force remarshaling of the message. Technically, we could just
1582 * recreate the kdbus message, but that is non-trivial as other parts of
1583 * the message refer to m->kdbus already. This should be fixed! */
1584 if ((*m
)->kdbus
&& (*m
)->release_kdbus
)
1587 return remarshal
? bus_message_remarshal(b
, m
) : 0;
1590 int bus_seal_synthetic_message(sd_bus
*b
, sd_bus_message
*m
) {
1594 /* Fake some timestamps, if they were requested, and not
1595 * already initialized */
1596 if (b
->attach_flags
& KDBUS_ATTACH_TIMESTAMP
) {
1597 if (m
->realtime
<= 0)
1598 m
->realtime
= now(CLOCK_REALTIME
);
1600 if (m
->monotonic
<= 0)
1601 m
->monotonic
= now(CLOCK_MONOTONIC
);
1604 /* The bus specification says the serial number cannot be 0,
1605 * hence let's fill something in for synthetic messages. Since
1606 * synthetic messages might have a fake sender and we don't
1607 * want to interfere with the real sender's serial numbers we
1608 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1609 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1610 * even though kdbus can do 64bit. */
1611 return bus_message_seal(m
, 0xFFFFFFFFULL
, 0);
1614 static int bus_write_message(sd_bus
*bus
, sd_bus_message
*m
, bool hint_sync_call
, size_t *idx
) {
1621 r
= bus_kernel_write_message(bus
, m
, hint_sync_call
);
1623 r
= bus_socket_write_message(bus
, m
, idx
);
1628 if (bus
->is_kernel
|| *idx
>= BUS_MESSAGE_SIZE(m
))
1629 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64
" reply_cookie=%" PRIu64
" error=%s",
1630 bus_message_type_to_string(m
->header
->type
),
1631 strna(sd_bus_message_get_sender(m
)),
1632 strna(sd_bus_message_get_destination(m
)),
1633 strna(sd_bus_message_get_path(m
)),
1634 strna(sd_bus_message_get_interface(m
)),
1635 strna(sd_bus_message_get_member(m
)),
1636 BUS_MESSAGE_COOKIE(m
),
1638 strna(m
->error
.message
));
1643 static int dispatch_wqueue(sd_bus
*bus
) {
1647 assert(bus
->state
== BUS_RUNNING
|| bus
->state
== BUS_HELLO
);
1649 while (bus
->wqueue_size
> 0) {
1651 r
= bus_write_message(bus
, bus
->wqueue
[0], false, &bus
->windex
);
1655 /* Didn't do anything this time */
1657 else if (bus
->is_kernel
|| bus
->windex
>= BUS_MESSAGE_SIZE(bus
->wqueue
[0])) {
1658 /* Fully written. Let's drop the entry from
1661 * This isn't particularly optimized, but
1662 * well, this is supposed to be our worst-case
1663 * buffer only, and the socket buffer is
1664 * supposed to be our primary buffer, and if
1665 * it got full, then all bets are off
1669 sd_bus_message_unref(bus
->wqueue
[0]);
1670 memmove(bus
->wqueue
, bus
->wqueue
+ 1, sizeof(sd_bus_message
*) * bus
->wqueue_size
);
1680 static int bus_read_message(sd_bus
*bus
, bool hint_priority
, int64_t priority
) {
1684 return bus_kernel_read_message(bus
, hint_priority
, priority
);
1686 return bus_socket_read_message(bus
);
1689 int bus_rqueue_make_room(sd_bus
*bus
) {
1692 if (bus
->rqueue_size
>= BUS_RQUEUE_MAX
)
1695 if (!GREEDY_REALLOC(bus
->rqueue
, bus
->rqueue_allocated
, bus
->rqueue_size
+ 1))
1701 static int dispatch_rqueue(sd_bus
*bus
, bool hint_priority
, int64_t priority
, sd_bus_message
**m
) {
1706 assert(bus
->state
== BUS_RUNNING
|| bus
->state
== BUS_HELLO
);
1708 /* Note that the priority logic is only available on kdbus,
1709 * where the rqueue is unused. We check the rqueue here
1710 * anyway, because it's simple... */
1713 if (bus
->rqueue_size
> 0) {
1714 /* Dispatch a queued message */
1716 *m
= bus
->rqueue
[0];
1718 memmove(bus
->rqueue
, bus
->rqueue
+ 1, sizeof(sd_bus_message
*) * bus
->rqueue_size
);
1722 /* Try to read a new message */
1723 r
= bus_read_message(bus
, hint_priority
, priority
);
1733 static int bus_send_internal(sd_bus
*bus
, sd_bus_message
*_m
, uint64_t *cookie
, bool hint_sync_call
) {
1734 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= sd_bus_message_ref(_m
);
1737 assert_return(m
, -EINVAL
);
1742 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1743 assert_return(!bus
->is_kernel
|| !(bus
->hello_flags
& KDBUS_HELLO_MONITOR
), -EROFS
);
1745 if (!BUS_IS_OPEN(bus
->state
))
1749 r
= sd_bus_can_send(bus
, SD_BUS_TYPE_UNIX_FD
);
1756 /* If the cookie number isn't kept, then we know that no reply
1758 if (!cookie
&& !m
->sealed
)
1759 m
->header
->flags
|= BUS_MESSAGE_NO_REPLY_EXPECTED
;
1761 r
= bus_seal_message(bus
, m
, 0);
1765 /* Remarshall if we have to. This will possibly unref the
1766 * message and place a replacement in m */
1767 r
= bus_remarshal_message(bus
, &m
);
1771 /* If this is a reply and no reply was requested, then let's
1772 * suppress this, if we can */
1776 if ((bus
->state
== BUS_RUNNING
|| bus
->state
== BUS_HELLO
) && bus
->wqueue_size
<= 0) {
1779 r
= bus_write_message(bus
, m
, hint_sync_call
, &idx
);
1781 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
1782 bus_enter_closing(bus
);
1789 if (!bus
->is_kernel
&& idx
< BUS_MESSAGE_SIZE(m
)) {
1790 /* Wasn't fully written. So let's remember how
1791 * much was written. Note that the first entry
1792 * of the wqueue array is always allocated so
1793 * that we always can remember how much was
1795 bus
->wqueue
[0] = sd_bus_message_ref(m
);
1796 bus
->wqueue_size
= 1;
1801 /* Just append it to the queue. */
1803 if (bus
->wqueue_size
>= BUS_WQUEUE_MAX
)
1806 if (!GREEDY_REALLOC(bus
->wqueue
, bus
->wqueue_allocated
, bus
->wqueue_size
+ 1))
1809 bus
->wqueue
[bus
->wqueue_size
++] = sd_bus_message_ref(m
);
1814 *cookie
= BUS_MESSAGE_COOKIE(m
);
1819 _public_
int sd_bus_send(sd_bus
*bus
, sd_bus_message
*m
, uint64_t *cookie
) {
1820 return bus_send_internal(bus
, m
, cookie
, false);
1823 _public_
int sd_bus_send_to(sd_bus
*bus
, sd_bus_message
*m
, const char *destination
, uint64_t *cookie
) {
1826 assert_return(m
, -EINVAL
);
1831 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1833 if (!BUS_IS_OPEN(bus
->state
))
1836 if (!streq_ptr(m
->destination
, destination
)) {
1841 r
= sd_bus_message_set_destination(m
, destination
);
1846 return sd_bus_send(bus
, m
, cookie
);
1849 static usec_t
calc_elapse(uint64_t usec
) {
1850 if (usec
== (uint64_t) -1)
1853 return now(CLOCK_MONOTONIC
) + usec
;
1856 static int timeout_compare(const void *a
, const void *b
) {
1857 const struct reply_callback
*x
= a
, *y
= b
;
1859 if (x
->timeout
!= 0 && y
->timeout
== 0)
1862 if (x
->timeout
== 0 && y
->timeout
!= 0)
1865 if (x
->timeout
< y
->timeout
)
1868 if (x
->timeout
> y
->timeout
)
1874 _public_
int sd_bus_call_async(
1878 sd_bus_message_handler_t callback
,
1882 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= sd_bus_message_ref(_m
);
1883 _cleanup_(sd_bus_slot_unrefp
) sd_bus_slot
*s
= NULL
;
1886 assert_return(m
, -EINVAL
);
1887 assert_return(m
->header
->type
== SD_BUS_MESSAGE_METHOD_CALL
, -EINVAL
);
1888 assert_return(!(m
->header
->flags
& BUS_MESSAGE_NO_REPLY_EXPECTED
), -EINVAL
);
1889 assert_return(callback
, -EINVAL
);
1894 assert_return(!bus_pid_changed(bus
), -ECHILD
);
1895 assert_return(!bus
->is_kernel
|| !(bus
->hello_flags
& KDBUS_HELLO_MONITOR
), -EROFS
);
1897 if (!BUS_IS_OPEN(bus
->state
))
1900 r
= ordered_hashmap_ensure_allocated(&bus
->reply_callbacks
, &uint64_hash_ops
);
1904 r
= prioq_ensure_allocated(&bus
->reply_callbacks_prioq
, timeout_compare
);
1908 r
= bus_seal_message(bus
, m
, usec
);
1912 r
= bus_remarshal_message(bus
, &m
);
1916 s
= bus_slot_allocate(bus
, !slot
, BUS_REPLY_CALLBACK
, sizeof(struct reply_callback
), userdata
);
1920 s
->reply_callback
.callback
= callback
;
1922 s
->reply_callback
.cookie
= BUS_MESSAGE_COOKIE(m
);
1923 r
= ordered_hashmap_put(bus
->reply_callbacks
, &s
->reply_callback
.cookie
, &s
->reply_callback
);
1925 s
->reply_callback
.cookie
= 0;
1929 s
->reply_callback
.timeout
= calc_elapse(m
->timeout
);
1930 if (s
->reply_callback
.timeout
!= 0) {
1931 r
= prioq_put(bus
->reply_callbacks_prioq
, &s
->reply_callback
, &s
->reply_callback
.prioq_idx
);
1933 s
->reply_callback
.timeout
= 0;
1938 r
= sd_bus_send(bus
, m
, &s
->reply_callback
.cookie
);
1949 int bus_ensure_running(sd_bus
*bus
) {
1954 if (bus
->state
== BUS_UNSET
|| bus
->state
== BUS_CLOSED
|| bus
->state
== BUS_CLOSING
)
1956 if (bus
->state
== BUS_RUNNING
)
1960 r
= sd_bus_process(bus
, NULL
);
1963 if (bus
->state
== BUS_RUNNING
)
1968 r
= sd_bus_wait(bus
, (uint64_t) -1);
1974 _public_
int sd_bus_call(
1978 sd_bus_error
*error
,
1979 sd_bus_message
**reply
) {
1981 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= sd_bus_message_ref(_m
);
1987 bus_assert_return(m
, -EINVAL
, error
);
1988 bus_assert_return(m
->header
->type
== SD_BUS_MESSAGE_METHOD_CALL
, -EINVAL
, error
);
1989 bus_assert_return(!(m
->header
->flags
& BUS_MESSAGE_NO_REPLY_EXPECTED
), -EINVAL
, error
);
1990 bus_assert_return(!bus_error_is_dirty(error
), -EINVAL
, error
);
1995 bus_assert_return(!bus_pid_changed(bus
), -ECHILD
, error
);
1996 bus_assert_return(!bus
->is_kernel
|| !(bus
->hello_flags
& KDBUS_HELLO_MONITOR
), -EROFS
, error
);
1998 if (!BUS_IS_OPEN(bus
->state
)) {
2003 r
= bus_ensure_running(bus
);
2007 i
= bus
->rqueue_size
;
2009 r
= bus_seal_message(bus
, m
, usec
);
2013 r
= bus_remarshal_message(bus
, &m
);
2017 r
= bus_send_internal(bus
, m
, &cookie
, true);
2021 timeout
= calc_elapse(m
->timeout
);
2026 while (i
< bus
->rqueue_size
) {
2027 sd_bus_message
*incoming
= NULL
;
2029 incoming
= bus
->rqueue
[i
];
2031 if (incoming
->reply_cookie
== cookie
) {
2032 /* Found a match! */
2034 memmove(bus
->rqueue
+ i
, bus
->rqueue
+ i
+ 1, sizeof(sd_bus_message
*) * (bus
->rqueue_size
- i
- 1));
2036 log_debug_bus_message(incoming
);
2038 if (incoming
->header
->type
== SD_BUS_MESSAGE_METHOD_RETURN
) {
2040 if (incoming
->n_fds
<= 0 || (bus
->hello_flags
& KDBUS_HELLO_ACCEPT_FD
)) {
2044 sd_bus_message_unref(incoming
);
2049 r
= sd_bus_error_setf(error
, SD_BUS_ERROR_INCONSISTENT_MESSAGE
, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2050 sd_bus_message_unref(incoming
);
2053 } else if (incoming
->header
->type
== SD_BUS_MESSAGE_METHOD_ERROR
) {
2054 r
= sd_bus_error_copy(error
, &incoming
->error
);
2055 sd_bus_message_unref(incoming
);
2062 } else if (BUS_MESSAGE_COOKIE(incoming
) == cookie
&&
2065 streq(bus
->unique_name
, incoming
->sender
)) {
2067 memmove(bus
->rqueue
+ i
, bus
->rqueue
+ i
+ 1, sizeof(sd_bus_message
*) * (bus
->rqueue_size
- i
- 1));
2070 /* Our own message? Somebody is trying
2071 * to send its own client a message,
2072 * let's not dead-lock, let's fail
2075 sd_bus_message_unref(incoming
);
2080 /* Try to read more, right-away */
2084 r
= bus_read_message(bus
, false, 0);
2086 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2087 bus_enter_closing(bus
);
2099 n
= now(CLOCK_MONOTONIC
);
2107 left
= (uint64_t) -1;
2109 r
= bus_poll(bus
, true, left
);
2117 r
= dispatch_wqueue(bus
);
2119 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2120 bus_enter_closing(bus
);
2129 return sd_bus_error_set_errno(error
, r
);
2132 _public_
int sd_bus_get_fd(sd_bus
*bus
) {
2134 assert_return(bus
, -EINVAL
);
2135 assert_return(bus
->input_fd
== bus
->output_fd
, -EPERM
);
2136 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2138 return bus
->input_fd
;
2141 _public_
int sd_bus_get_events(sd_bus
*bus
) {
2144 assert_return(bus
, -EINVAL
);
2145 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2147 if (!BUS_IS_OPEN(bus
->state
) && bus
->state
!= BUS_CLOSING
)
2150 if (bus
->state
== BUS_OPENING
)
2152 else if (bus
->state
== BUS_AUTHENTICATING
) {
2154 if (bus_socket_auth_needs_write(bus
))
2159 } else if (bus
->state
== BUS_RUNNING
|| bus
->state
== BUS_HELLO
) {
2160 if (bus
->rqueue_size
<= 0)
2162 if (bus
->wqueue_size
> 0)
2169 _public_
int sd_bus_get_timeout(sd_bus
*bus
, uint64_t *timeout_usec
) {
2170 struct reply_callback
*c
;
2172 assert_return(bus
, -EINVAL
);
2173 assert_return(timeout_usec
, -EINVAL
);
2174 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2176 if (!BUS_IS_OPEN(bus
->state
) && bus
->state
!= BUS_CLOSING
)
2179 if (bus
->track_queue
) {
2184 if (bus
->state
== BUS_CLOSING
) {
2189 if (bus
->state
== BUS_AUTHENTICATING
) {
2190 *timeout_usec
= bus
->auth_timeout
;
2194 if (bus
->state
!= BUS_RUNNING
&& bus
->state
!= BUS_HELLO
) {
2195 *timeout_usec
= (uint64_t) -1;
2199 if (bus
->rqueue_size
> 0) {
2204 c
= prioq_peek(bus
->reply_callbacks_prioq
);
2206 *timeout_usec
= (uint64_t) -1;
2210 if (c
->timeout
== 0) {
2211 *timeout_usec
= (uint64_t) -1;
2215 *timeout_usec
= c
->timeout
;
2219 static int process_timeout(sd_bus
*bus
) {
2220 _cleanup_(sd_bus_error_free
) sd_bus_error error_buffer
= SD_BUS_ERROR_NULL
;
2221 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
* m
= NULL
;
2222 struct reply_callback
*c
;
2229 c
= prioq_peek(bus
->reply_callbacks_prioq
);
2233 n
= now(CLOCK_MONOTONIC
);
2237 r
= bus_message_new_synthetic_error(
2240 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY
, "Method call timed out"),
2245 r
= bus_seal_synthetic_message(bus
, m
);
2249 assert_se(prioq_pop(bus
->reply_callbacks_prioq
) == c
);
2252 ordered_hashmap_remove(bus
->reply_callbacks
, &c
->cookie
);
2255 slot
= container_of(c
, sd_bus_slot
, reply_callback
);
2257 bus
->iteration_counter
++;
2259 bus
->current_message
= m
;
2260 bus
->current_slot
= sd_bus_slot_ref(slot
);
2261 bus
->current_handler
= c
->callback
;
2262 bus
->current_userdata
= slot
->userdata
;
2263 r
= c
->callback(m
, slot
->userdata
, &error_buffer
);
2264 bus
->current_userdata
= NULL
;
2265 bus
->current_handler
= NULL
;
2266 bus
->current_slot
= NULL
;
2267 bus
->current_message
= NULL
;
2269 if (slot
->floating
) {
2270 bus_slot_disconnect(slot
);
2271 sd_bus_slot_unref(slot
);
2274 sd_bus_slot_unref(slot
);
2276 return bus_maybe_reply_error(m
, r
, &error_buffer
);
2279 static int process_hello(sd_bus
*bus
, sd_bus_message
*m
) {
2283 if (bus
->state
!= BUS_HELLO
)
2286 /* Let's make sure the first message on the bus is the HELLO
2287 * reply. But note that we don't actually parse the message
2288 * here (we leave that to the usual handling), we just verify
2289 * we don't let any earlier msg through. */
2291 if (m
->header
->type
!= SD_BUS_MESSAGE_METHOD_RETURN
&&
2292 m
->header
->type
!= SD_BUS_MESSAGE_METHOD_ERROR
)
2295 if (m
->reply_cookie
!= 1)
2301 static int process_reply(sd_bus
*bus
, sd_bus_message
*m
) {
2302 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*synthetic_reply
= NULL
;
2303 _cleanup_(sd_bus_error_free
) sd_bus_error error_buffer
= SD_BUS_ERROR_NULL
;
2304 struct reply_callback
*c
;
2311 if (m
->header
->type
!= SD_BUS_MESSAGE_METHOD_RETURN
&&
2312 m
->header
->type
!= SD_BUS_MESSAGE_METHOD_ERROR
)
2315 if (bus
->is_kernel
&& (bus
->hello_flags
& KDBUS_HELLO_MONITOR
))
2318 if (m
->destination
&& bus
->unique_name
&& !streq_ptr(m
->destination
, bus
->unique_name
))
2321 c
= ordered_hashmap_remove(bus
->reply_callbacks
, &m
->reply_cookie
);
2327 slot
= container_of(c
, sd_bus_slot
, reply_callback
);
2329 if (m
->n_fds
> 0 && !(bus
->hello_flags
& KDBUS_HELLO_ACCEPT_FD
)) {
2331 /* If the reply contained a file descriptor which we
2332 * didn't want we pass an error instead. */
2334 r
= bus_message_new_synthetic_error(
2337 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE
, "Reply message contained file descriptor"),
2342 /* Copy over original timestamp */
2343 synthetic_reply
->realtime
= m
->realtime
;
2344 synthetic_reply
->monotonic
= m
->monotonic
;
2345 synthetic_reply
->seqnum
= m
->seqnum
;
2347 r
= bus_seal_synthetic_message(bus
, synthetic_reply
);
2351 m
= synthetic_reply
;
2353 r
= sd_bus_message_rewind(m
, true);
2358 if (c
->timeout
!= 0) {
2359 prioq_remove(bus
->reply_callbacks_prioq
, c
, &c
->prioq_idx
);
2363 bus
->current_slot
= sd_bus_slot_ref(slot
);
2364 bus
->current_handler
= c
->callback
;
2365 bus
->current_userdata
= slot
->userdata
;
2366 r
= c
->callback(m
, slot
->userdata
, &error_buffer
);
2367 bus
->current_userdata
= NULL
;
2368 bus
->current_handler
= NULL
;
2369 bus
->current_slot
= NULL
;
2371 if (slot
->floating
) {
2372 bus_slot_disconnect(slot
);
2373 sd_bus_slot_unref(slot
);
2376 sd_bus_slot_unref(slot
);
2378 return bus_maybe_reply_error(m
, r
, &error_buffer
);
2381 static int process_filter(sd_bus
*bus
, sd_bus_message
*m
) {
2382 _cleanup_(sd_bus_error_free
) sd_bus_error error_buffer
= SD_BUS_ERROR_NULL
;
2383 struct filter_callback
*l
;
2390 bus
->filter_callbacks_modified
= false;
2392 LIST_FOREACH(callbacks
, l
, bus
->filter_callbacks
) {
2395 if (bus
->filter_callbacks_modified
)
2398 /* Don't run this more than once per iteration */
2399 if (l
->last_iteration
== bus
->iteration_counter
)
2402 l
->last_iteration
= bus
->iteration_counter
;
2404 r
= sd_bus_message_rewind(m
, true);
2408 slot
= container_of(l
, sd_bus_slot
, filter_callback
);
2410 bus
->current_slot
= sd_bus_slot_ref(slot
);
2411 bus
->current_handler
= l
->callback
;
2412 bus
->current_userdata
= slot
->userdata
;
2413 r
= l
->callback(m
, slot
->userdata
, &error_buffer
);
2414 bus
->current_userdata
= NULL
;
2415 bus
->current_handler
= NULL
;
2416 bus
->current_slot
= sd_bus_slot_unref(slot
);
2418 r
= bus_maybe_reply_error(m
, r
, &error_buffer
);
2424 } while (bus
->filter_callbacks_modified
);
2429 static int process_match(sd_bus
*bus
, sd_bus_message
*m
) {
2436 bus
->match_callbacks_modified
= false;
2438 r
= bus_match_run(bus
, &bus
->match_callbacks
, m
);
2442 } while (bus
->match_callbacks_modified
);
2447 static int process_builtin(sd_bus
*bus
, sd_bus_message
*m
) {
2448 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*reply
= NULL
;
2454 if (bus
->hello_flags
& KDBUS_HELLO_MONITOR
)
2457 if (bus
->manual_peer_interface
)
2460 if (m
->header
->type
!= SD_BUS_MESSAGE_METHOD_CALL
)
2463 if (!streq_ptr(m
->interface
, "org.freedesktop.DBus.Peer"))
2466 if (m
->header
->flags
& BUS_MESSAGE_NO_REPLY_EXPECTED
)
2469 if (streq_ptr(m
->member
, "Ping"))
2470 r
= sd_bus_message_new_method_return(m
, &reply
);
2471 else if (streq_ptr(m
->member
, "GetMachineId")) {
2475 r
= sd_id128_get_machine(&id
);
2479 r
= sd_bus_message_new_method_return(m
, &reply
);
2483 r
= sd_bus_message_append(reply
, "s", sd_id128_to_string(id
, sid
));
2485 r
= sd_bus_message_new_method_errorf(
2487 SD_BUS_ERROR_UNKNOWN_METHOD
,
2488 "Unknown method '%s' on interface '%s'.", m
->member
, m
->interface
);
2494 r
= sd_bus_send(bus
, reply
, NULL
);
2501 static int process_fd_check(sd_bus
*bus
, sd_bus_message
*m
) {
2505 /* If we got a message with a file descriptor which we didn't
2506 * want to accept, then let's drop it. How can this even
2507 * happen? For example, when the kernel queues a message into
2508 * an activatable names's queue which allows fds, and then is
2509 * delivered to us later even though we ourselves did not
2512 if (bus
->hello_flags
& KDBUS_HELLO_MONITOR
)
2518 if (bus
->hello_flags
& KDBUS_HELLO_ACCEPT_FD
)
2521 if (m
->header
->type
!= SD_BUS_MESSAGE_METHOD_CALL
)
2522 return 1; /* just eat it up */
2524 return sd_bus_reply_method_errorf(m
, SD_BUS_ERROR_INCONSISTENT_MESSAGE
, "Message contains file descriptors, which I cannot accept. Sorry.");
2527 static int process_message(sd_bus
*bus
, sd_bus_message
*m
) {
2533 bus
->current_message
= m
;
2534 bus
->iteration_counter
++;
2536 log_debug_bus_message(m
);
2538 r
= process_hello(bus
, m
);
2542 r
= process_reply(bus
, m
);
2546 r
= process_fd_check(bus
, m
);
2550 r
= process_filter(bus
, m
);
2554 r
= process_match(bus
, m
);
2558 r
= process_builtin(bus
, m
);
2562 r
= bus_process_object(bus
, m
);
2565 bus
->current_message
= NULL
;
2569 static int dispatch_track(sd_bus
*bus
) {
2572 if (!bus
->track_queue
)
2575 bus_track_dispatch(bus
->track_queue
);
2579 static int process_running(sd_bus
*bus
, bool hint_priority
, int64_t priority
, sd_bus_message
**ret
) {
2580 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
2584 assert(bus
->state
== BUS_RUNNING
|| bus
->state
== BUS_HELLO
);
2586 r
= process_timeout(bus
);
2590 r
= dispatch_wqueue(bus
);
2594 r
= dispatch_track(bus
);
2598 r
= dispatch_rqueue(bus
, hint_priority
, priority
, &m
);
2604 r
= process_message(bus
, m
);
2609 r
= sd_bus_message_rewind(m
, true);
2618 if (m
->header
->type
== SD_BUS_MESSAGE_METHOD_CALL
) {
2620 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2621 strna(sd_bus_message_get_sender(m
)),
2622 strna(sd_bus_message_get_path(m
)),
2623 strna(sd_bus_message_get_interface(m
)),
2624 strna(sd_bus_message_get_member(m
)));
2626 r
= sd_bus_reply_method_errorf(
2628 SD_BUS_ERROR_UNKNOWN_OBJECT
,
2629 "Unknown object '%s'.", m
->path
);
2643 static int process_closing(sd_bus
*bus
, sd_bus_message
**ret
) {
2644 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
2645 struct reply_callback
*c
;
2649 assert(bus
->state
== BUS_CLOSING
);
2651 c
= ordered_hashmap_first(bus
->reply_callbacks
);
2653 _cleanup_(sd_bus_error_free
) sd_bus_error error_buffer
= SD_BUS_ERROR_NULL
;
2656 /* First, fail all outstanding method calls */
2657 r
= bus_message_new_synthetic_error(
2660 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY
, "Connection terminated"),
2665 r
= bus_seal_synthetic_message(bus
, m
);
2669 if (c
->timeout
!= 0) {
2670 prioq_remove(bus
->reply_callbacks_prioq
, c
, &c
->prioq_idx
);
2674 ordered_hashmap_remove(bus
->reply_callbacks
, &c
->cookie
);
2677 slot
= container_of(c
, sd_bus_slot
, reply_callback
);
2679 bus
->iteration_counter
++;
2681 bus
->current_message
= m
;
2682 bus
->current_slot
= sd_bus_slot_ref(slot
);
2683 bus
->current_handler
= c
->callback
;
2684 bus
->current_userdata
= slot
->userdata
;
2685 r
= c
->callback(m
, slot
->userdata
, &error_buffer
);
2686 bus
->current_userdata
= NULL
;
2687 bus
->current_handler
= NULL
;
2688 bus
->current_slot
= NULL
;
2689 bus
->current_message
= NULL
;
2691 if (slot
->floating
) {
2692 bus_slot_disconnect(slot
);
2693 sd_bus_slot_unref(slot
);
2696 sd_bus_slot_unref(slot
);
2698 return bus_maybe_reply_error(m
, r
, &error_buffer
);
2701 /* Then, synthesize a Disconnected message */
2702 r
= sd_bus_message_new_signal(
2705 "/org/freedesktop/DBus/Local",
2706 "org.freedesktop.DBus.Local",
2711 bus_message_set_sender_local(bus
, m
);
2713 r
= bus_seal_synthetic_message(bus
, m
);
2719 bus
->current_message
= m
;
2720 bus
->iteration_counter
++;
2722 r
= process_filter(bus
, m
);
2726 r
= process_match(bus
, m
);
2738 bus
->current_message
= NULL
;
2743 static int bus_process_internal(sd_bus
*bus
, bool hint_priority
, int64_t priority
, sd_bus_message
**ret
) {
2744 BUS_DONT_DESTROY(bus
);
2747 /* Returns 0 when we didn't do anything. This should cause the
2748 * caller to invoke sd_bus_wait() before returning the next
2749 * time. Returns > 0 when we did something, which possibly
2750 * means *ret is filled in with an unprocessed message. */
2752 assert_return(bus
, -EINVAL
);
2753 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2755 /* We don't allow recursively invoking sd_bus_process(). */
2756 assert_return(!bus
->current_message
, -EBUSY
);
2757 assert(!bus
->current_slot
);
2759 switch (bus
->state
) {
2768 r
= bus_socket_process_opening(bus
);
2769 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2770 bus_enter_closing(bus
);
2778 case BUS_AUTHENTICATING
:
2779 r
= bus_socket_process_authenticating(bus
);
2780 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2781 bus_enter_closing(bus
);
2793 r
= process_running(bus
, hint_priority
, priority
, ret
);
2794 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2795 bus_enter_closing(bus
);
2805 return process_closing(bus
, ret
);
2808 assert_not_reached("Unknown state");
2811 _public_
int sd_bus_process(sd_bus
*bus
, sd_bus_message
**ret
) {
2812 return bus_process_internal(bus
, false, 0, ret
);
2815 _public_
int sd_bus_process_priority(sd_bus
*bus
, int64_t priority
, sd_bus_message
**ret
) {
2816 return bus_process_internal(bus
, true, priority
, ret
);
2819 static int bus_poll(sd_bus
*bus
, bool need_more
, uint64_t timeout_usec
) {
2820 struct pollfd p
[2] = {};
2823 usec_t m
= USEC_INFINITY
;
2827 if (bus
->state
== BUS_CLOSING
)
2830 if (!BUS_IS_OPEN(bus
->state
))
2833 e
= sd_bus_get_events(bus
);
2838 /* The caller really needs some more data, he doesn't
2839 * care about what's already read, or any timeouts
2840 * except its own. */
2844 /* The caller wants to process if there's something to
2845 * process, but doesn't care otherwise */
2847 r
= sd_bus_get_timeout(bus
, &until
);
2852 nw
= now(CLOCK_MONOTONIC
);
2853 m
= until
> nw
? until
- nw
: 0;
2857 if (timeout_usec
!= (uint64_t) -1 && (m
== (uint64_t) -1 || timeout_usec
< m
))
2860 p
[0].fd
= bus
->input_fd
;
2861 if (bus
->output_fd
== bus
->input_fd
) {
2865 p
[0].events
= e
& POLLIN
;
2866 p
[1].fd
= bus
->output_fd
;
2867 p
[1].events
= e
& POLLOUT
;
2871 r
= ppoll(p
, n
, m
== (uint64_t) -1 ? NULL
: timespec_store(&ts
, m
), NULL
);
2875 return r
> 0 ? 1 : 0;
2878 _public_
int sd_bus_wait(sd_bus
*bus
, uint64_t timeout_usec
) {
2880 assert_return(bus
, -EINVAL
);
2881 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2883 if (bus
->state
== BUS_CLOSING
)
2886 if (!BUS_IS_OPEN(bus
->state
))
2889 if (bus
->rqueue_size
> 0)
2892 return bus_poll(bus
, false, timeout_usec
);
2895 _public_
int sd_bus_flush(sd_bus
*bus
) {
2898 assert_return(bus
, -EINVAL
);
2899 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2901 if (bus
->state
== BUS_CLOSING
)
2904 if (!BUS_IS_OPEN(bus
->state
))
2907 r
= bus_ensure_running(bus
);
2911 if (bus
->wqueue_size
<= 0)
2915 r
= dispatch_wqueue(bus
);
2917 if (IN_SET(r
, -ENOTCONN
, -ECONNRESET
, -EPIPE
, -ESHUTDOWN
)) {
2918 bus_enter_closing(bus
);
2925 if (bus
->wqueue_size
<= 0)
2928 r
= bus_poll(bus
, false, (uint64_t) -1);
2934 _public_
int sd_bus_add_filter(
2937 sd_bus_message_handler_t callback
,
2942 assert_return(bus
, -EINVAL
);
2943 assert_return(callback
, -EINVAL
);
2944 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2946 s
= bus_slot_allocate(bus
, !slot
, BUS_FILTER_CALLBACK
, sizeof(struct filter_callback
), userdata
);
2950 s
->filter_callback
.callback
= callback
;
2952 bus
->filter_callbacks_modified
= true;
2953 LIST_PREPEND(callbacks
, bus
->filter_callbacks
, &s
->filter_callback
);
2961 _public_
int sd_bus_add_match(
2965 sd_bus_message_handler_t callback
,
2968 struct bus_match_component
*components
= NULL
;
2969 unsigned n_components
= 0;
2970 sd_bus_slot
*s
= NULL
;
2973 assert_return(bus
, -EINVAL
);
2974 assert_return(match
, -EINVAL
);
2975 assert_return(!bus_pid_changed(bus
), -ECHILD
);
2977 r
= bus_match_parse(match
, &components
, &n_components
);
2981 s
= bus_slot_allocate(bus
, !slot
, BUS_MATCH_CALLBACK
, sizeof(struct match_callback
), userdata
);
2987 s
->match_callback
.callback
= callback
;
2988 s
->match_callback
.cookie
= ++bus
->match_cookie
;
2990 if (bus
->bus_client
) {
2991 enum bus_match_scope scope
;
2993 scope
= bus_match_get_scope(components
, n_components
);
2995 /* Do not install server-side matches for matches
2996 * against the local service, interface or bus
2998 if (scope
!= BUS_MATCH_LOCAL
) {
3000 if (!bus
->is_kernel
) {
3001 /* When this is not a kernel transport, we
3002 * store the original match string, so that we
3003 * can use it to remove the match again */
3005 s
->match_callback
.match_string
= strdup(match
);
3006 if (!s
->match_callback
.match_string
) {
3012 r
= bus_add_match_internal(bus
, s
->match_callback
.match_string
, components
, n_components
, s
->match_callback
.cookie
);
3016 s
->match_added
= true;
3020 bus
->match_callbacks_modified
= true;
3021 r
= bus_match_add(&bus
->match_callbacks
, components
, n_components
, &s
->match_callback
);
3030 bus_match_parse_free(components
, n_components
);
3031 sd_bus_slot_unref(s
);
3036 int bus_remove_match_by_string(
3039 sd_bus_message_handler_t callback
,
3042 struct bus_match_component
*components
= NULL
;
3043 unsigned n_components
= 0;
3044 struct match_callback
*c
;
3047 assert_return(bus
, -EINVAL
);
3048 assert_return(match
, -EINVAL
);
3049 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3051 r
= bus_match_parse(match
, &components
, &n_components
);
3055 r
= bus_match_find(&bus
->match_callbacks
, components
, n_components
, NULL
, NULL
, &c
);
3059 sd_bus_slot_unref(container_of(c
, sd_bus_slot
, match_callback
));
3062 bus_match_parse_free(components
, n_components
);
3067 bool bus_pid_changed(sd_bus
*bus
) {
3070 /* We don't support people creating a bus connection and
3071 * keeping it around over a fork(). Let's complain. */
3073 return bus
->original_pid
!= getpid();
3076 static int io_callback(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
3077 sd_bus
*bus
= userdata
;
3082 r
= sd_bus_process(bus
, NULL
);
3089 static int time_callback(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
3090 sd_bus
*bus
= userdata
;
3095 r
= sd_bus_process(bus
, NULL
);
3102 static int prepare_callback(sd_event_source
*s
, void *userdata
) {
3103 sd_bus
*bus
= userdata
;
3110 e
= sd_bus_get_events(bus
);
3114 if (bus
->output_fd
!= bus
->input_fd
) {
3116 r
= sd_event_source_set_io_events(bus
->input_io_event_source
, e
& POLLIN
);
3120 r
= sd_event_source_set_io_events(bus
->output_io_event_source
, e
& POLLOUT
);
3124 r
= sd_event_source_set_io_events(bus
->input_io_event_source
, e
);
3129 r
= sd_bus_get_timeout(bus
, &until
);
3135 j
= sd_event_source_set_time(bus
->time_event_source
, until
);
3140 r
= sd_event_source_set_enabled(bus
->time_event_source
, r
> 0);
3147 static int quit_callback(sd_event_source
*event
, void *userdata
) {
3148 sd_bus
*bus
= userdata
;
3158 static int attach_io_events(sd_bus
*bus
) {
3163 if (bus
->input_fd
< 0)
3169 if (!bus
->input_io_event_source
) {
3170 r
= sd_event_add_io(bus
->event
, &bus
->input_io_event_source
, bus
->input_fd
, 0, io_callback
, bus
);
3174 r
= sd_event_source_set_prepare(bus
->input_io_event_source
, prepare_callback
);
3178 r
= sd_event_source_set_priority(bus
->input_io_event_source
, bus
->event_priority
);
3182 r
= sd_event_source_set_description(bus
->input_io_event_source
, "bus-input");
3184 r
= sd_event_source_set_io_fd(bus
->input_io_event_source
, bus
->input_fd
);
3189 if (bus
->output_fd
!= bus
->input_fd
) {
3190 assert(bus
->output_fd
>= 0);
3192 if (!bus
->output_io_event_source
) {
3193 r
= sd_event_add_io(bus
->event
, &bus
->output_io_event_source
, bus
->output_fd
, 0, io_callback
, bus
);
3197 r
= sd_event_source_set_priority(bus
->output_io_event_source
, bus
->event_priority
);
3201 r
= sd_event_source_set_description(bus
->input_io_event_source
, "bus-output");
3203 r
= sd_event_source_set_io_fd(bus
->output_io_event_source
, bus
->output_fd
);
3212 static void detach_io_events(sd_bus
*bus
) {
3215 if (bus
->input_io_event_source
) {
3216 sd_event_source_set_enabled(bus
->input_io_event_source
, SD_EVENT_OFF
);
3217 bus
->input_io_event_source
= sd_event_source_unref(bus
->input_io_event_source
);
3220 if (bus
->output_io_event_source
) {
3221 sd_event_source_set_enabled(bus
->output_io_event_source
, SD_EVENT_OFF
);
3222 bus
->output_io_event_source
= sd_event_source_unref(bus
->output_io_event_source
);
3226 _public_
int sd_bus_attach_event(sd_bus
*bus
, sd_event
*event
, int priority
) {
3229 assert_return(bus
, -EINVAL
);
3230 assert_return(!bus
->event
, -EBUSY
);
3232 assert(!bus
->input_io_event_source
);
3233 assert(!bus
->output_io_event_source
);
3234 assert(!bus
->time_event_source
);
3237 bus
->event
= sd_event_ref(event
);
3239 r
= sd_event_default(&bus
->event
);
3244 bus
->event_priority
= priority
;
3246 r
= sd_event_add_time(bus
->event
, &bus
->time_event_source
, CLOCK_MONOTONIC
, 0, 0, time_callback
, bus
);
3250 r
= sd_event_source_set_priority(bus
->time_event_source
, priority
);
3254 r
= sd_event_source_set_description(bus
->time_event_source
, "bus-time");
3258 r
= sd_event_add_exit(bus
->event
, &bus
->quit_event_source
, quit_callback
, bus
);
3262 r
= sd_event_source_set_description(bus
->quit_event_source
, "bus-exit");
3266 r
= attach_io_events(bus
);
3273 sd_bus_detach_event(bus
);
3277 _public_
int sd_bus_detach_event(sd_bus
*bus
) {
3278 assert_return(bus
, -EINVAL
);
3283 detach_io_events(bus
);
3285 if (bus
->time_event_source
) {
3286 sd_event_source_set_enabled(bus
->time_event_source
, SD_EVENT_OFF
);
3287 bus
->time_event_source
= sd_event_source_unref(bus
->time_event_source
);
3290 if (bus
->quit_event_source
) {
3291 sd_event_source_set_enabled(bus
->quit_event_source
, SD_EVENT_OFF
);
3292 bus
->quit_event_source
= sd_event_source_unref(bus
->quit_event_source
);
3295 bus
->event
= sd_event_unref(bus
->event
);
3299 _public_ sd_event
* sd_bus_get_event(sd_bus
*bus
) {
3300 assert_return(bus
, NULL
);
3305 _public_ sd_bus_message
* sd_bus_get_current_message(sd_bus
*bus
) {
3306 assert_return(bus
, NULL
);
3308 return bus
->current_message
;
3311 _public_ sd_bus_slot
* sd_bus_get_current_slot(sd_bus
*bus
) {
3312 assert_return(bus
, NULL
);
3314 return bus
->current_slot
;
3317 _public_ sd_bus_message_handler_t
sd_bus_get_current_handler(sd_bus
*bus
) {
3318 assert_return(bus
, NULL
);
3320 return bus
->current_handler
;
3323 _public_
void* sd_bus_get_current_userdata(sd_bus
*bus
) {
3324 assert_return(bus
, NULL
);
3326 return bus
->current_userdata
;
3329 static int bus_default(int (*bus_open
)(sd_bus
**), sd_bus
**default_bus
, sd_bus
**ret
) {
3334 assert(default_bus
);
3337 return !!*default_bus
;
3340 *ret
= sd_bus_ref(*default_bus
);
3348 b
->default_bus_ptr
= default_bus
;
3356 _public_
int sd_bus_default_system(sd_bus
**ret
) {
3357 return bus_default(sd_bus_open_system
, &default_system_bus
, ret
);
3361 _public_
int sd_bus_default_user(sd_bus
**ret
) {
3362 return bus_default(sd_bus_open_user
, &default_user_bus
, ret
);
3365 _public_
int sd_bus_default(sd_bus
**ret
) {
3369 /* Let's try our best to reuse another cached connection. If
3370 * the starter bus type is set, connect via our normal
3371 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3372 * we can share the connection with the user/system default
3375 e
= secure_getenv("DBUS_STARTER_BUS_TYPE");
3377 if (streq(e
, "system"))
3378 return sd_bus_default_system(ret
);
3379 else if (STR_IN_SET(e
, "user", "session"))
3380 return sd_bus_default_user(ret
);
3383 /* No type is specified, so we have not other option than to
3384 * use the starter address if it is set. */
3386 e
= secure_getenv("DBUS_STARTER_ADDRESS");
3389 return bus_default(sd_bus_open
, &default_starter_bus
, ret
);
3392 /* Finally, if nothing is set use the cached connection for
3393 * the right scope */
3395 if (cg_pid_get_owner_uid(0, NULL
) >= 0)
3396 return sd_bus_default_user(ret
);
3398 return sd_bus_default_system(ret
);
3401 _public_
int sd_bus_get_tid(sd_bus
*b
, pid_t
*tid
) {
3402 assert_return(b
, -EINVAL
);
3403 assert_return(tid
, -EINVAL
);
3404 assert_return(!bus_pid_changed(b
), -ECHILD
);
3412 return sd_event_get_tid(b
->event
, tid
);
3417 _public_
int sd_bus_path_encode(const char *prefix
, const char *external_id
, char **ret_path
) {
3418 _cleanup_free_
char *e
= NULL
;
3421 assert_return(object_path_is_valid(prefix
), -EINVAL
);
3422 assert_return(external_id
, -EINVAL
);
3423 assert_return(ret_path
, -EINVAL
);
3425 e
= bus_label_escape(external_id
);
3429 ret
= strjoin(prefix
, "/", e
, NULL
);
3437 _public_
int sd_bus_path_decode(const char *path
, const char *prefix
, char **external_id
) {
3441 assert_return(object_path_is_valid(path
), -EINVAL
);
3442 assert_return(object_path_is_valid(prefix
), -EINVAL
);
3443 assert_return(external_id
, -EINVAL
);
3445 e
= object_path_startswith(path
, prefix
);
3447 *external_id
= NULL
;
3451 ret
= bus_label_unescape(e
);
3459 _public_
int sd_bus_path_encode_many(char **out
, const char *path_template
, ...) {
3460 _cleanup_strv_free_
char **labels
= NULL
;
3461 char *path
, *path_pos
, **label_pos
;
3462 const char *sep
, *template_pos
;
3467 assert_return(out
, -EINVAL
);
3468 assert_return(path_template
, -EINVAL
);
3470 path_length
= strlen(path_template
);
3472 va_start(list
, path_template
);
3473 for (sep
= strchr(path_template
, '%'); sep
; sep
= strchr(sep
+ 1, '%')) {
3477 arg
= va_arg(list
, const char *);
3483 label
= bus_label_escape(arg
);
3489 r
= strv_consume(&labels
, label
);
3495 /* add label length, but account for the format character */
3496 path_length
+= strlen(label
) - 1;
3500 path
= malloc(path_length
+ 1);
3507 for (template_pos
= path_template
; *template_pos
; ) {
3508 sep
= strchrnul(template_pos
, '%');
3509 path_pos
= mempcpy(path_pos
, template_pos
, sep
- template_pos
);
3513 path_pos
= stpcpy(path_pos
, *label_pos
++);
3514 template_pos
= sep
+ 1;
3522 _public_
int sd_bus_path_decode_many(const char *path
, const char *path_template
, ...) {
3523 _cleanup_strv_free_
char **labels
= NULL
;
3524 const char *template_pos
, *path_pos
;
3530 * This decodes an object-path based on a template argument. The
3531 * template consists of a verbatim path, optionally including special
3534 * - Each occurrence of '%' in the template matches an arbitrary
3535 * substring of a label in the given path. At most one such
3536 * directive is allowed per label. For each such directive, the
3537 * caller must provide an output parameter (char **) via va_arg. If
3538 * NULL is passed, the given label is verified, but not returned.
3539 * For each matched label, the *decoded* label is stored in the
3540 * passed output argument, and the caller is responsible to free
3541 * it. Note that the output arguments are only modified if the
3542 * actualy path matched the template. Otherwise, they're left
3545 * This function returns <0 on error, 0 if the path does not match the
3546 * template, 1 if it matched.
3549 assert_return(path
, -EINVAL
);
3550 assert_return(path_template
, -EINVAL
);
3554 for (template_pos
= path_template
; *template_pos
; ) {
3559 /* verify everything until the next '%' matches verbatim */
3560 sep
= strchrnul(template_pos
, '%');
3561 length
= sep
- template_pos
;
3562 if (strncmp(path_pos
, template_pos
, length
))
3566 template_pos
+= length
;
3571 /* We found the next '%' character. Everything up until here
3572 * matched. We now skip ahead to the end of this label and make
3573 * sure it matches the tail of the label in the path. Then we
3574 * decode the string in-between and save it for later use. */
3576 ++template_pos
; /* skip over '%' */
3578 sep
= strchrnul(template_pos
, '/');
3579 length
= sep
- template_pos
; /* length of suffix to match verbatim */
3581 /* verify the suffixes match */
3582 sep
= strchrnul(path_pos
, '/');
3583 if (sep
- path_pos
< (ssize_t
)length
||
3584 strncmp(sep
- length
, template_pos
, length
))
3587 template_pos
+= length
; /* skip over matched label */
3588 length
= sep
- path_pos
- length
; /* length of sub-label to decode */
3590 /* store unescaped label for later use */
3591 label
= bus_label_unescape_n(path_pos
, length
);
3595 r
= strv_consume(&labels
, label
);
3599 path_pos
= sep
; /* skip decoded label and suffix */
3602 /* end of template must match end of path */
3606 /* copy the labels over to the caller */
3607 va_start(list
, path_template
);
3608 for (label_pos
= labels
; label_pos
&& *label_pos
; ++label_pos
) {
3611 arg
= va_arg(list
, char **);
3624 _public_
int sd_bus_try_close(sd_bus
*bus
) {
3627 assert_return(bus
, -EINVAL
);
3628 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3630 if (!bus
->is_kernel
)
3633 if (!BUS_IS_OPEN(bus
->state
))
3636 if (bus
->rqueue_size
> 0)
3639 if (bus
->wqueue_size
> 0)
3642 r
= bus_kernel_try_close(bus
);
3650 _public_
int sd_bus_get_description(sd_bus
*bus
, const char **description
) {
3651 assert_return(bus
, -EINVAL
);
3652 assert_return(description
, -EINVAL
);
3653 assert_return(bus
->description
, -ENXIO
);
3654 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3656 *description
= bus
->description
;
3660 int bus_get_root_path(sd_bus
*bus
) {
3663 if (bus
->cgroup_root
)
3666 r
= cg_get_root_path(&bus
->cgroup_root
);
3668 bus
->cgroup_root
= strdup("/");
3669 if (!bus
->cgroup_root
)
3678 _public_
int sd_bus_get_scope(sd_bus
*bus
, const char **scope
) {
3681 assert_return(bus
, -EINVAL
);
3682 assert_return(scope
, -EINVAL
);
3683 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3685 if (bus
->is_kernel
) {
3686 _cleanup_free_
char *n
= NULL
;
3689 r
= bus_kernel_get_bus_name(bus
, &n
);
3693 if (streq(n
, "0-system")) {
3698 dash
= strchr(n
, '-');
3699 if (streq_ptr(dash
, "-user")) {
3710 if (bus
->is_system
) {
3718 _public_
int sd_bus_get_address(sd_bus
*bus
, const char **address
) {
3720 assert_return(bus
, -EINVAL
);
3721 assert_return(address
, -EINVAL
);
3722 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3725 *address
= bus
->address
;
3732 _public_
int sd_bus_get_creds_mask(sd_bus
*bus
, uint64_t *mask
) {
3733 assert_return(bus
, -EINVAL
);
3734 assert_return(mask
, -EINVAL
);
3735 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3737 *mask
= bus
->creds_mask
;
3741 _public_
int sd_bus_is_bus_client(sd_bus
*bus
) {
3742 assert_return(bus
, -EINVAL
);
3743 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3745 return bus
->bus_client
;
3748 _public_
int sd_bus_is_server(sd_bus
*bus
) {
3749 assert_return(bus
, -EINVAL
);
3750 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3752 return bus
->is_server
;
3755 _public_
int sd_bus_is_anonymous(sd_bus
*bus
) {
3756 assert_return(bus
, -EINVAL
);
3757 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3759 return bus
->anonymous_auth
;
3762 _public_
int sd_bus_is_trusted(sd_bus
*bus
) {
3763 assert_return(bus
, -EINVAL
);
3764 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3766 return bus
->trusted
;
3769 _public_
int sd_bus_is_monitor(sd_bus
*bus
) {
3770 assert_return(bus
, -EINVAL
);
3771 assert_return(!bus_pid_changed(bus
), -ECHILD
);
3773 return !!(bus
->hello_flags
& KDBUS_HELLO_MONITOR
);
3776 static void flush_close(sd_bus
*bus
) {
3780 /* Flushes and closes the specified bus. We take a ref before,
3781 * to ensure the flushing does not cause the bus to be
3784 sd_bus_flush_close_unref(sd_bus_ref(bus
));
3787 _public_
void sd_bus_default_flush_close(void) {
3788 flush_close(default_starter_bus
);
3789 flush_close(default_user_bus
);
3790 flush_close(default_system_bus
);