1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
6 #include "alloc-util.h"
7 #include "errno-util.h"
12 #include "process-util.h"
13 #include "selinux-util.h"
15 #include "socket-util.h"
16 #include "string-table.h"
17 #include "string-util.h"
19 #include "time-util.h"
20 #include "umask-util.h"
21 #include "user-util.h"
24 #define VARLINK_DEFAULT_CONNECTIONS_MAX 4096U
25 #define VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX 1024U
27 #define VARLINK_DEFAULT_TIMEOUT_USEC (45U*USEC_PER_SEC)
28 #define VARLINK_BUFFER_MAX (16U*1024U*1024U)
29 #define VARLINK_READ_SIZE (64U*1024U)
31 typedef enum VarlinkState
{
32 /* Client side states */
34 VARLINK_AWAITING_REPLY
,
35 VARLINK_AWAITING_REPLY_MORE
,
38 VARLINK_PROCESSING_REPLY
,
40 /* Server side states */
42 VARLINK_PROCESSING_METHOD
,
43 VARLINK_PROCESSING_METHOD_MORE
,
44 VARLINK_PROCESSING_METHOD_ONEWAY
,
45 VARLINK_PROCESSED_METHOD
,
46 VARLINK_PENDING_METHOD
,
47 VARLINK_PENDING_METHOD_MORE
,
49 /* Common states (only during shutdown) */
50 VARLINK_PENDING_DISCONNECT
,
51 VARLINK_PENDING_TIMEOUT
,
52 VARLINK_PROCESSING_DISCONNECT
,
53 VARLINK_PROCESSING_TIMEOUT
,
54 VARLINK_PROCESSING_FAILURE
,
58 _VARLINK_STATE_INVALID
= -EINVAL
,
61 /* Tests whether we are not yet disconnected. Note that this is true during all states where the connection
62 * is still good for something, and false only when it's dead for good. This means: when we are
63 * asynchronously connecting to a peer and the connect() is still pending, then this will return 'true', as
64 * the connection is still good, and we are likely to be able to properly operate on it soon. */
65 #define VARLINK_STATE_IS_ALIVE(state) \
67 VARLINK_IDLE_CLIENT, \
68 VARLINK_AWAITING_REPLY, \
69 VARLINK_AWAITING_REPLY_MORE, \
72 VARLINK_PROCESSING_REPLY, \
73 VARLINK_IDLE_SERVER, \
74 VARLINK_PROCESSING_METHOD, \
75 VARLINK_PROCESSING_METHOD_MORE, \
76 VARLINK_PROCESSING_METHOD_ONEWAY, \
77 VARLINK_PROCESSED_METHOD, \
78 VARLINK_PENDING_METHOD, \
79 VARLINK_PENDING_METHOD_MORE)
84 VarlinkServer
*server
;
87 bool connecting
; /* This boolean indicates whether the socket fd we are operating on is currently
88 * processing an asynchronous connect(). In that state we watch the socket for
89 * EPOLLOUT, but we refrain from calling read() or write() on the socket as that
90 * will trigger ENOTCONN. Note that this boolean is kept separate from the
91 * VarlinkState above on purpose: while the connect() is still not complete we
92 * already want to allow queuing of messages and similar. Thus it's nice to keep
93 * these two state concepts separate: the VarlinkState encodes what our own view of
94 * the connection is, i.e. whether we think it's a server, a client, and has
95 * something queued already, while 'connecting' tells us a detail about the
96 * transport used below, that should have no effect on how we otherwise accept and
97 * process operations from the user.
99 * Or to say this differently: VARLINK_STATE_IS_ALIVE(state) tells you whether the
100 * connection is good to use, even if it might not be fully connected
101 * yet. connecting=true then informs you that actually we are still connecting, and
102 * the connection is actually not established yet and thus any requests you enqueue
103 * now will still work fine but will be queued only, not sent yet, but that
104 * shouldn't stop you from using the connection, since eventually whatever you queue
107 * Or to say this even differently: 'state' is a high-level ("application layer"
108 * high, if you so will) state, while 'conecting' is a low-level ("transport layer"
109 * low, if you so will) state, and while they are not entirely unrelated and
110 * sometimes propagate effects to each other they are only asynchronously connected
116 char *input_buffer
; /* valid data starts at input_buffer_index, ends at input_buffer_index+input_buffer_size */
117 size_t input_buffer_index
;
118 size_t input_buffer_size
;
119 size_t input_buffer_unscanned
;
121 char *output_buffer
; /* valid data starts at output_buffer_index, ends at output_buffer_index+output_buffer_size */
122 size_t output_buffer_index
;
123 size_t output_buffer_size
;
125 VarlinkReply reply_callback
;
127 JsonVariant
*current
;
131 bool ucred_acquired
:1;
133 bool write_disconnected
:1;
134 bool read_disconnected
:1;
135 bool prefer_read_write
:1;
145 sd_event_source
*io_event_source
;
146 sd_event_source
*time_event_source
;
147 sd_event_source
*quit_event_source
;
148 sd_event_source
*defer_event_source
;
151 typedef struct VarlinkServerSocket VarlinkServerSocket
;
153 struct VarlinkServerSocket
{
154 VarlinkServer
*server
;
159 sd_event_source
*event_source
;
161 LIST_FIELDS(VarlinkServerSocket
, sockets
);
164 struct VarlinkServer
{
166 VarlinkServerFlags flags
;
168 LIST_HEAD(VarlinkServerSocket
, sockets
);
171 VarlinkConnect connect_callback
;
172 VarlinkDisconnect disconnect_callback
;
175 int64_t event_priority
;
177 unsigned n_connections
;
183 unsigned connections_max
;
184 unsigned connections_per_uid_max
;
187 static const char* const varlink_state_table
[_VARLINK_STATE_MAX
] = {
188 [VARLINK_IDLE_CLIENT
] = "idle-client",
189 [VARLINK_AWAITING_REPLY
] = "awaiting-reply",
190 [VARLINK_AWAITING_REPLY_MORE
] = "awaiting-reply-more",
191 [VARLINK_CALLING
] = "calling",
192 [VARLINK_CALLED
] = "called",
193 [VARLINK_PROCESSING_REPLY
] = "processing-reply",
194 [VARLINK_IDLE_SERVER
] = "idle-server",
195 [VARLINK_PROCESSING_METHOD
] = "processing-method",
196 [VARLINK_PROCESSING_METHOD_MORE
] = "processing-method-more",
197 [VARLINK_PROCESSING_METHOD_ONEWAY
] = "processing-method-oneway",
198 [VARLINK_PROCESSED_METHOD
] = "processed-method",
199 [VARLINK_PENDING_METHOD
] = "pending-method",
200 [VARLINK_PENDING_METHOD_MORE
] = "pending-method-more",
201 [VARLINK_PENDING_DISCONNECT
] = "pending-disconnect",
202 [VARLINK_PENDING_TIMEOUT
] = "pending-timeout",
203 [VARLINK_PROCESSING_DISCONNECT
] = "processing-disconnect",
204 [VARLINK_PROCESSING_TIMEOUT
] = "processing-timeout",
205 [VARLINK_PROCESSING_FAILURE
] = "processing-failure",
206 [VARLINK_DISCONNECTED
] = "disconnected",
209 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(varlink_state
, VarlinkState
);
211 #define varlink_log_errno(v, error, fmt, ...) \
212 log_debug_errno(error, "%s: " fmt, varlink_description(v), ##__VA_ARGS__)
214 #define varlink_log(v, fmt, ...) \
215 log_debug("%s: " fmt, varlink_description(v), ##__VA_ARGS__)
217 #define varlink_server_log_errno(s, error, fmt, ...) \
218 log_debug_errno(error, "%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
220 #define varlink_server_log(s, fmt, ...) \
221 log_debug("%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
223 static inline const char *varlink_description(Varlink
*v
) {
224 return (v
? v
->description
: NULL
) ?: "varlink";
227 static inline const char *varlink_server_description(VarlinkServer
*s
) {
228 return (s
? s
->description
: NULL
) ?: "varlink";
231 static void varlink_set_state(Varlink
*v
, VarlinkState state
) {
233 assert(state
>= 0 && state
< _VARLINK_STATE_MAX
);
236 varlink_log(v
, "Setting state %s",
237 varlink_state_to_string(state
));
239 varlink_log(v
, "Changing state %s → %s",
240 varlink_state_to_string(v
->state
),
241 varlink_state_to_string(state
));
246 static int varlink_new(Varlink
**ret
) {
259 .state
= _VARLINK_STATE_INVALID
,
261 .ucred
.uid
= UID_INVALID
,
262 .ucred
.gid
= GID_INVALID
,
264 .timestamp
= USEC_INFINITY
,
265 .timeout
= VARLINK_DEFAULT_TIMEOUT_USEC
272 int varlink_connect_address(Varlink
**ret
, const char *address
) {
273 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
274 union sockaddr_union sockaddr
;
275 socklen_t sockaddr_len
;
278 assert_return(ret
, -EINVAL
);
279 assert_return(address
, -EINVAL
);
281 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
283 return log_debug_errno(r
, "Failed to set socket address '%s': %m", address
);
288 return log_debug_errno(r
, "Failed to create varlink object: %m");
290 v
->fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
292 return log_debug_errno(errno
, "Failed to create AF_UNIX socket: %m");
294 v
->fd
= fd_move_above_stdio(v
->fd
);
296 if (connect(v
->fd
, &sockaddr
.sa
, sockaddr_len
) < 0) {
297 if (!IN_SET(errno
, EAGAIN
, EINPROGRESS
))
298 return log_debug_errno(errno
, "Failed to connect to %s: %m", address
);
300 v
->connecting
= true; /* We are asynchronously connecting, i.e. the connect() is being
301 * processed in the background. As long as that's the case the socket
302 * is in a special state: it's there, we can poll it for EPOLLOUT, but
303 * if we attempt to write() to it before we see EPOLLOUT we'll get
304 * ENOTCONN (and not EAGAIN, like we would for a normal connected
305 * socket that isn't writable at the moment). Since ENOTCONN on write()
306 * hence can mean two different things (i.e. connection not complete
307 * yet vs. already disconnected again), we store as a boolean whether
308 * we are still in connect(). */
311 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
317 int varlink_connect_fd(Varlink
**ret
, int fd
) {
321 assert_return(ret
, -EINVAL
);
322 assert_return(fd
>= 0, -EBADF
);
324 r
= fd_nonblock(fd
, true);
326 return log_debug_errno(r
, "Failed to make fd %d nonblocking: %m", fd
);
330 return log_debug_errno(r
, "Failed to create varlink object: %m");
333 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
335 /* Note that if this function is called we assume the passed socket (if it is one) is already
336 * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that
337 * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket
338 * until the connection is fully set up. Behaviour here is hence a bit different from
339 * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and
340 * avoid doing write() on it before we saw EPOLLOUT for the first time. */
346 static void varlink_detach_event_sources(Varlink
*v
) {
349 v
->io_event_source
= sd_event_source_disable_unref(v
->io_event_source
);
350 v
->time_event_source
= sd_event_source_disable_unref(v
->time_event_source
);
351 v
->quit_event_source
= sd_event_source_disable_unref(v
->quit_event_source
);
352 v
->defer_event_source
= sd_event_source_disable_unref(v
->defer_event_source
);
355 static void varlink_clear(Varlink
*v
) {
358 varlink_detach_event_sources(v
);
360 v
->fd
= safe_close(v
->fd
);
362 v
->input_buffer
= mfree(v
->input_buffer
);
363 v
->output_buffer
= mfree(v
->output_buffer
);
365 v
->current
= json_variant_unref(v
->current
);
366 v
->reply
= json_variant_unref(v
->reply
);
368 v
->event
= sd_event_unref(v
->event
);
371 static Varlink
* varlink_destroy(Varlink
*v
) {
375 /* If this is called the server object must already been unreffed here. Why that? because when we
376 * linked up the varlink connection with the server object we took one ref in each direction */
381 free(v
->description
);
385 DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink
, varlink
, varlink_destroy
);
387 static int varlink_test_disconnect(Varlink
*v
) {
390 /* Tests whether we the connection has been terminated. We are careful to not stop processing it
391 * prematurely, since we want to handle half-open connections as well as possible and want to flush
392 * out and read data before we close down if we can. */
394 /* Already disconnected? */
395 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
398 /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */
402 /* Still something to write and we can write? Stay around */
403 if (v
->output_buffer_size
> 0 && !v
->write_disconnected
)
406 /* Both sides gone already? Then there's no need to stick around */
407 if (v
->read_disconnected
&& v
->write_disconnected
)
410 /* If we are waiting for incoming data but the read side is shut down, disconnect. */
411 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) && v
->read_disconnected
)
414 /* Similar, if are a client that hasn't written anything yet but the write side is dead, also
415 * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side
416 * being down if we never wrote anything. */
417 if (IN_SET(v
->state
, VARLINK_IDLE_CLIENT
) && (v
->write_disconnected
|| v
->got_pollhup
))
420 /* The server is still expecting to write more, but its write end is disconnected and it got a POLLHUP
421 * (i.e. from a disconnected client), so disconnect. */
422 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
) && v
->write_disconnected
&& v
->got_pollhup
)
428 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
432 static int varlink_write(Varlink
*v
) {
437 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
439 if (v
->connecting
) /* Writing while we are still wait for a non-blocking connect() to complete will
440 * result in ENOTCONN, hence exit early here */
442 if (v
->output_buffer_size
== 0)
444 if (v
->write_disconnected
)
449 /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible
450 * with non-socket IO, hence fall back automatically.
452 * Use a local variable to help gcc figure out that we set 'n' in all cases. */
453 bool prefer_write
= v
->prefer_read_write
;
455 n
= send(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
, MSG_DONTWAIT
|MSG_NOSIGNAL
);
456 if (n
< 0 && errno
== ENOTSOCK
)
457 prefer_write
= v
->prefer_read_write
= true;
460 n
= write(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
);
465 if (ERRNO_IS_DISCONNECT(errno
)) {
466 /* If we get informed about a disconnect on write, then let's remember that, but not
467 * act on it just yet. Let's wait for read() to report the issue first. */
468 v
->write_disconnected
= true;
475 v
->output_buffer_size
-= n
;
477 if (v
->output_buffer_size
== 0)
478 v
->output_buffer_index
= 0;
480 v
->output_buffer_index
+= n
;
482 v
->timestamp
= now(CLOCK_MONOTONIC
);
486 static int varlink_read(Varlink
*v
) {
492 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
))
494 if (v
->connecting
) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */
498 if (v
->input_buffer_unscanned
> 0)
500 if (v
->read_disconnected
)
503 if (v
->input_buffer_size
>= VARLINK_BUFFER_MAX
)
508 if (MALLOC_SIZEOF_SAFE(v
->input_buffer
) <= v
->input_buffer_index
+ v
->input_buffer_size
) {
511 add
= MIN(VARLINK_BUFFER_MAX
- v
->input_buffer_size
, VARLINK_READ_SIZE
);
513 if (v
->input_buffer_index
== 0) {
515 if (!GREEDY_REALLOC(v
->input_buffer
, v
->input_buffer_size
+ add
))
521 b
= new(char, v
->input_buffer_size
+ add
);
525 memcpy(b
, v
->input_buffer
+ v
->input_buffer_index
, v
->input_buffer_size
);
527 free_and_replace(v
->input_buffer
, b
);
528 v
->input_buffer_index
= 0;
532 rs
= MALLOC_SIZEOF_SAFE(v
->input_buffer
) - (v
->input_buffer_index
+ v
->input_buffer_size
);
534 bool prefer_read
= v
->prefer_read_write
;
536 n
= recv(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
, MSG_DONTWAIT
);
537 if (n
< 0 && errno
== ENOTSOCK
)
538 prefer_read
= v
->prefer_read_write
= true;
541 n
= read(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
);
546 if (ERRNO_IS_DISCONNECT(errno
)) {
547 v
->read_disconnected
= true;
553 if (n
== 0) { /* EOF */
554 v
->read_disconnected
= true;
558 v
->input_buffer_size
+= n
;
559 v
->input_buffer_unscanned
+= n
;
564 static int varlink_parse_message(Varlink
*v
) {
565 const char *e
, *begin
;
573 if (v
->input_buffer_unscanned
<= 0)
576 assert(v
->input_buffer_unscanned
<= v
->input_buffer_size
);
577 assert(v
->input_buffer_index
+ v
->input_buffer_size
<= MALLOC_SIZEOF_SAFE(v
->input_buffer
));
579 begin
= v
->input_buffer
+ v
->input_buffer_index
;
581 e
= memchr(begin
+ v
->input_buffer_size
- v
->input_buffer_unscanned
, 0, v
->input_buffer_unscanned
);
583 v
->input_buffer_unscanned
= 0;
589 varlink_log(v
, "New incoming message: %s", begin
); /* FIXME: should we output the whole message here before validation?
590 * This may produce a non-printable journal entry if the message
591 * is invalid. We may also expose privileged information. */
593 r
= json_parse(begin
, 0, &v
->current
, NULL
, NULL
);
595 /* If we encounter a parse failure flush all data. We cannot possibly recover from this,
596 * hence drop all buffered data now. */
597 v
->input_buffer_index
= v
->input_buffer_size
= v
->input_buffer_unscanned
= 0;
598 return varlink_log_errno(v
, r
, "Failed to parse JSON: %m");
601 v
->input_buffer_size
-= sz
;
603 if (v
->input_buffer_size
== 0)
604 v
->input_buffer_index
= 0;
606 v
->input_buffer_index
+= sz
;
608 v
->input_buffer_unscanned
= v
->input_buffer_size
;
612 static int varlink_test_timeout(Varlink
*v
) {
615 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
617 if (v
->timeout
== USEC_INFINITY
)
620 if (now(CLOCK_MONOTONIC
) < usec_add(v
->timestamp
, v
->timeout
))
623 varlink_set_state(v
, VARLINK_PENDING_TIMEOUT
);
628 static int varlink_dispatch_local_error(Varlink
*v
, const char *error
) {
634 if (!v
->reply_callback
)
637 r
= v
->reply_callback(v
, NULL
, error
, VARLINK_REPLY_ERROR
|VARLINK_REPLY_LOCAL
, v
->userdata
);
639 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
644 static int varlink_dispatch_timeout(Varlink
*v
) {
647 if (v
->state
!= VARLINK_PENDING_TIMEOUT
)
650 varlink_set_state(v
, VARLINK_PROCESSING_TIMEOUT
);
651 varlink_dispatch_local_error(v
, VARLINK_ERROR_TIMEOUT
);
657 static int varlink_dispatch_disconnect(Varlink
*v
) {
660 if (v
->state
!= VARLINK_PENDING_DISCONNECT
)
663 varlink_set_state(v
, VARLINK_PROCESSING_DISCONNECT
);
664 varlink_dispatch_local_error(v
, VARLINK_ERROR_DISCONNECTED
);
670 static int varlink_sanitize_parameters(JsonVariant
**v
) {
673 /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */
675 return json_variant_new_object(v
, NULL
, 0);
676 else if (!json_variant_is_object(*v
))
682 static int varlink_dispatch_reply(Varlink
*v
) {
683 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
684 VarlinkReplyFlags flags
= 0;
685 const char *error
= NULL
;
692 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
697 assert(v
->n_pending
> 0);
699 if (!json_variant_is_object(v
->current
))
702 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
704 if (streq(k
, "error")) {
707 if (!json_variant_is_string(e
))
710 error
= json_variant_string(e
);
711 flags
|= VARLINK_REPLY_ERROR
;
713 } else if (streq(k
, "parameters")) {
716 if (!json_variant_is_object(e
))
719 parameters
= json_variant_ref(e
);
721 } else if (streq(k
, "continues")) {
722 if (FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
725 if (!json_variant_is_boolean(e
))
728 if (json_variant_boolean(e
))
729 flags
|= VARLINK_REPLY_CONTINUES
;
734 /* Replies with 'continue' set are only OK if we set 'more' when the method call was initiated */
735 if (v
->state
!= VARLINK_AWAITING_REPLY_MORE
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
738 /* An error is final */
739 if (error
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
742 r
= varlink_sanitize_parameters(¶meters
);
746 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
)) {
747 varlink_set_state(v
, VARLINK_PROCESSING_REPLY
);
749 if (v
->reply_callback
) {
750 r
= v
->reply_callback(v
, parameters
, error
, flags
, v
->userdata
);
752 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
755 v
->current
= json_variant_unref(v
->current
);
757 if (v
->state
== VARLINK_PROCESSING_REPLY
) {
759 assert(v
->n_pending
> 0);
761 if (!FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
765 FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
) ? VARLINK_AWAITING_REPLY_MORE
:
766 v
->n_pending
== 0 ? VARLINK_IDLE_CLIENT
: VARLINK_AWAITING_REPLY
);
769 assert(v
->state
== VARLINK_CALLING
);
770 varlink_set_state(v
, VARLINK_CALLED
);
776 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
777 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
783 static int varlink_dispatch_method(Varlink
*v
) {
784 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
785 VarlinkMethodFlags flags
= 0;
786 const char *method
= NULL
, *error
;
788 VarlinkMethod callback
;
794 if (v
->state
!= VARLINK_IDLE_SERVER
)
799 if (!json_variant_is_object(v
->current
))
802 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
804 if (streq(k
, "method")) {
807 if (!json_variant_is_string(e
))
810 method
= json_variant_string(e
);
812 } else if (streq(k
, "parameters")) {
815 if (!json_variant_is_object(e
))
818 parameters
= json_variant_ref(e
);
820 } else if (streq(k
, "oneway")) {
822 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
825 if (!json_variant_is_boolean(e
))
828 if (json_variant_boolean(e
))
829 flags
|= VARLINK_METHOD_ONEWAY
;
831 } else if (streq(k
, "more")) {
833 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
836 if (!json_variant_is_boolean(e
))
839 if (json_variant_boolean(e
))
840 flags
|= VARLINK_METHOD_MORE
;
849 r
= varlink_sanitize_parameters(¶meters
);
853 varlink_set_state(v
, (flags
& VARLINK_METHOD_MORE
) ? VARLINK_PROCESSING_METHOD_MORE
:
854 (flags
& VARLINK_METHOD_ONEWAY
) ? VARLINK_PROCESSING_METHOD_ONEWAY
:
855 VARLINK_PROCESSING_METHOD
);
859 if (STR_IN_SET(method
, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) {
860 /* For now, we don't implement a single of varlink's own methods */
862 error
= VARLINK_ERROR_METHOD_NOT_IMPLEMENTED
;
863 } else if (startswith(method
, "org.varlink.service.")) {
865 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
867 callback
= hashmap_get(v
->server
->methods
, method
);
868 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
872 r
= callback(v
, parameters
, flags
, v
->userdata
);
874 log_debug_errno(r
, "Callback for %s returned error: %m", method
);
876 /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */
877 if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
878 r
= varlink_error_errno(v
, r
);
883 } else if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
886 r
= varlink_errorb(v
, error
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
))));
893 case VARLINK_PROCESSED_METHOD
: /* Method call is fully processed */
894 case VARLINK_PROCESSING_METHOD_ONEWAY
: /* ditto */
895 v
->current
= json_variant_unref(v
->current
);
896 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
899 case VARLINK_PROCESSING_METHOD
: /* Method call wasn't replied to, will be replied to later */
900 varlink_set_state(v
, VARLINK_PENDING_METHOD
);
903 case VARLINK_PROCESSING_METHOD_MORE
: /* No reply for a "more" message was sent, more to come */
904 varlink_set_state(v
, VARLINK_PENDING_METHOD_MORE
);
908 assert_not_reached("Unexpected state");
918 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
919 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
925 int varlink_process(Varlink
*v
) {
928 assert_return(v
, -EINVAL
);
930 if (v
->state
== VARLINK_DISCONNECTED
)
931 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
935 r
= varlink_write(v
);
937 varlink_log_errno(v
, r
, "Write failed: %m");
941 r
= varlink_dispatch_reply(v
);
943 varlink_log_errno(v
, r
, "Reply dispatch failed: %m");
947 r
= varlink_dispatch_method(v
);
949 varlink_log_errno(v
, r
, "Method dispatch failed: %m");
953 r
= varlink_parse_message(v
);
955 varlink_log_errno(v
, r
, "Message parsing failed: %m");
961 varlink_log_errno(v
, r
, "Read failed: %m");
965 r
= varlink_test_disconnect(v
);
970 r
= varlink_dispatch_disconnect(v
);
975 r
= varlink_test_timeout(v
);
980 r
= varlink_dispatch_timeout(v
);
986 if (r
>= 0 && v
->defer_event_source
) {
989 /* If we did some processing, make sure we are called again soon */
990 q
= sd_event_source_set_enabled(v
->defer_event_source
, r
> 0 ? SD_EVENT_ON
: SD_EVENT_OFF
);
992 r
= varlink_log_errno(v
, q
, "Failed to enable deferred event source: %m");
996 if (VARLINK_STATE_IS_ALIVE(v
->state
))
997 /* Initiate disconnection */
998 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
1000 /* We failed while disconnecting, in that case close right away */
1008 static void handle_revents(Varlink
*v
, int revents
) {
1011 if (v
->connecting
) {
1012 /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect()
1013 * to complete on, we know we are ready. We don't read the connection error here though,
1014 * we'll get the error on the next read() or write(). */
1015 if ((revents
& (POLLOUT
|POLLHUP
)) == 0)
1018 varlink_log(v
, "Anynchronous connection completed.");
1019 v
->connecting
= false;
1021 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
1022 * what we can. However, we do care about POLLHUP to detect connection termination even if we
1023 * momentarily don't want to read nor write anything. */
1025 if (!FLAGS_SET(revents
, POLLHUP
))
1028 varlink_log(v
, "Got POLLHUP from socket.");
1029 v
->got_pollhup
= true;
1033 int varlink_wait(Varlink
*v
, usec_t timeout
) {
1037 assert_return(v
, -EINVAL
);
1039 if (v
->state
== VARLINK_DISCONNECTED
)
1040 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1042 r
= varlink_get_timeout(v
, &t
);
1045 if (t
!= USEC_INFINITY
) {
1048 n
= now(CLOCK_MONOTONIC
);
1052 t
= usec_sub_unsigned(t
, n
);
1055 if (timeout
!= USEC_INFINITY
&&
1056 (t
== USEC_INFINITY
|| timeout
< t
))
1059 fd
= varlink_get_fd(v
);
1063 events
= varlink_get_events(v
);
1067 r
= fd_wait_for_event(fd
, events
, t
);
1071 handle_revents(v
, r
);
1075 int varlink_get_fd(Varlink
*v
) {
1077 assert_return(v
, -EINVAL
);
1079 if (v
->state
== VARLINK_DISCONNECTED
)
1080 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1082 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBADF
), "No valid fd.");
1087 int varlink_get_events(Varlink
*v
) {
1090 assert_return(v
, -EINVAL
);
1092 if (v
->state
== VARLINK_DISCONNECTED
)
1093 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1095 if (v
->connecting
) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which
1096 * tells us that the connection is now complete. Before that we should neither
1097 * write() or read() from the fd. */
1100 if (!v
->read_disconnected
&&
1101 IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) &&
1103 v
->input_buffer_unscanned
<= 0)
1106 if (!v
->write_disconnected
&&
1107 v
->output_buffer_size
> 0)
1113 int varlink_get_timeout(Varlink
*v
, usec_t
*ret
) {
1114 assert_return(v
, -EINVAL
);
1116 if (v
->state
== VARLINK_DISCONNECTED
)
1117 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1119 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
) &&
1120 v
->timeout
!= USEC_INFINITY
) {
1122 *ret
= usec_add(v
->timestamp
, v
->timeout
);
1126 *ret
= USEC_INFINITY
;
1131 int varlink_flush(Varlink
*v
) {
1134 assert_return(v
, -EINVAL
);
1136 if (v
->state
== VARLINK_DISCONNECTED
)
1137 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1140 if (v
->output_buffer_size
== 0)
1142 if (v
->write_disconnected
)
1145 r
= varlink_write(v
);
1153 r
= fd_wait_for_event(v
->fd
, POLLOUT
, USEC_INFINITY
);
1155 return varlink_log_errno(v
, r
, "Poll failed on fd: %m");
1159 handle_revents(v
, r
);
1165 static void varlink_detach_server(Varlink
*v
) {
1166 VarlinkServer
*saved_server
;
1172 if (v
->server
->by_uid
&&
1173 v
->ucred_acquired
&&
1174 uid_is_valid(v
->ucred
.uid
)) {
1177 c
= PTR_TO_UINT(hashmap_get(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
)));
1181 (void) hashmap_remove(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
));
1183 (void) hashmap_replace(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
), UINT_TO_PTR(c
- 1));
1186 assert(v
->server
->n_connections
> 0);
1187 v
->server
->n_connections
--;
1189 /* If this is a connection associated to a server, then let's disconnect the server and the
1190 * connection from each other. This drops the dangling reference that connect_callback() set up. But
1191 * before we release the references, let's call the disconnection callback if it is defined. */
1193 saved_server
= TAKE_PTR(v
->server
);
1195 if (saved_server
->disconnect_callback
)
1196 saved_server
->disconnect_callback(saved_server
, v
, saved_server
->userdata
);
1198 varlink_server_unref(saved_server
);
1202 int varlink_close(Varlink
*v
) {
1203 assert_return(v
, -EINVAL
);
1205 if (v
->state
== VARLINK_DISCONNECTED
)
1208 varlink_set_state(v
, VARLINK_DISCONNECTED
);
1210 /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref
1211 * which would destroy us before we can call varlink_clear() */
1213 varlink_detach_server(v
);
1220 Varlink
* varlink_close_unref(Varlink
*v
) {
1224 (void) varlink_close(v
);
1225 return varlink_unref(v
);
1228 Varlink
* varlink_flush_close_unref(Varlink
*v
) {
1232 (void) varlink_flush(v
);
1233 return varlink_close_unref(v
);
1236 static int varlink_enqueue_json(Varlink
*v
, JsonVariant
*m
) {
1237 _cleanup_free_
char *text
= NULL
;
1243 r
= json_variant_format(m
, 0, &text
);
1246 assert(text
[r
] == '\0');
1248 if (v
->output_buffer_size
+ r
+ 1 > VARLINK_BUFFER_MAX
)
1251 varlink_log(v
, "Sending message: %s", text
);
1253 if (v
->output_buffer_size
== 0) {
1255 free_and_replace(v
->output_buffer
, text
);
1257 v
->output_buffer_size
= r
+ 1;
1258 v
->output_buffer_index
= 0;
1260 } else if (v
->output_buffer_index
== 0) {
1262 if (!GREEDY_REALLOC(v
->output_buffer
, v
->output_buffer_size
+ r
+ 1))
1265 memcpy(v
->output_buffer
+ v
->output_buffer_size
, text
, r
+ 1);
1266 v
->output_buffer_size
+= r
+ 1;
1270 const size_t new_size
= v
->output_buffer_size
+ r
+ 1;
1272 n
= new(char, new_size
);
1276 memcpy(mempcpy(n
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
), text
, r
+ 1);
1278 free_and_replace(v
->output_buffer
, n
);
1279 v
->output_buffer_size
= new_size
;
1280 v
->output_buffer_index
= 0;
1286 int varlink_send(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1287 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1290 assert_return(v
, -EINVAL
);
1291 assert_return(method
, -EINVAL
);
1293 if (v
->state
== VARLINK_DISCONNECTED
)
1294 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1296 /* We allow enqueuing multiple method calls at once! */
1297 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1298 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1300 r
= varlink_sanitize_parameters(¶meters
);
1302 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1304 r
= json_build(&m
, JSON_BUILD_OBJECT(
1305 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1306 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1307 JSON_BUILD_PAIR("oneway", JSON_BUILD_BOOLEAN(true))));
1309 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1311 r
= varlink_enqueue_json(v
, m
);
1313 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1315 /* No state change here, this is one-way only after all */
1316 v
->timestamp
= now(CLOCK_MONOTONIC
);
1320 int varlink_sendb(Varlink
*v
, const char *method
, ...) {
1321 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1325 assert_return(v
, -EINVAL
);
1327 va_start(ap
, method
);
1328 r
= json_buildv(¶meters
, ap
);
1332 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1334 return varlink_send(v
, method
, parameters
);
1337 int varlink_invoke(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1338 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1341 assert_return(v
, -EINVAL
);
1342 assert_return(method
, -EINVAL
);
1344 if (v
->state
== VARLINK_DISCONNECTED
)
1345 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1347 /* We allow enqueuing multiple method calls at once! */
1348 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1349 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1351 r
= varlink_sanitize_parameters(¶meters
);
1353 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1355 r
= json_build(&m
, JSON_BUILD_OBJECT(
1356 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1357 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1359 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1361 r
= varlink_enqueue_json(v
, m
);
1363 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1365 varlink_set_state(v
, VARLINK_AWAITING_REPLY
);
1367 v
->timestamp
= now(CLOCK_MONOTONIC
);
1372 int varlink_invokeb(Varlink
*v
, const char *method
, ...) {
1373 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1377 assert_return(v
, -EINVAL
);
1379 va_start(ap
, method
);
1380 r
= json_buildv(¶meters
, ap
);
1384 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1386 return varlink_invoke(v
, method
, parameters
);
1389 int varlink_observe(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1390 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1393 assert_return(v
, -EINVAL
);
1394 assert_return(method
, -EINVAL
);
1396 if (v
->state
== VARLINK_DISCONNECTED
)
1397 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1399 /* Note that we don't allow enqueuing multiple method calls when we are in more/continues mode! We
1400 * thus insist on an idle client here. */
1401 if (v
->state
!= VARLINK_IDLE_CLIENT
)
1402 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1404 r
= varlink_sanitize_parameters(¶meters
);
1406 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1408 r
= json_build(&m
, JSON_BUILD_OBJECT(
1409 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1410 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1411 JSON_BUILD_PAIR("more", JSON_BUILD_BOOLEAN(true))));
1413 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1415 r
= varlink_enqueue_json(v
, m
);
1417 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1419 varlink_set_state(v
, VARLINK_AWAITING_REPLY_MORE
);
1421 v
->timestamp
= now(CLOCK_MONOTONIC
);
1426 int varlink_observeb(Varlink
*v
, const char *method
, ...) {
1427 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1431 assert_return(v
, -EINVAL
);
1433 va_start(ap
, method
);
1434 r
= json_buildv(¶meters
, ap
);
1438 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1440 return varlink_observe(v
, method
, parameters
);
1446 JsonVariant
*parameters
,
1447 JsonVariant
**ret_parameters
,
1448 const char **ret_error_id
,
1449 VarlinkReplyFlags
*ret_flags
) {
1451 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1454 assert_return(v
, -EINVAL
);
1455 assert_return(method
, -EINVAL
);
1457 if (v
->state
== VARLINK_DISCONNECTED
)
1458 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1459 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
))
1460 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1462 assert(v
->n_pending
== 0); /* n_pending can't be > 0 if we are in VARLINK_IDLE_CLIENT state */
1464 r
= varlink_sanitize_parameters(¶meters
);
1466 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1468 r
= json_build(&m
, JSON_BUILD_OBJECT(
1469 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1470 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1472 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1474 r
= varlink_enqueue_json(v
, m
);
1476 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1478 varlink_set_state(v
, VARLINK_CALLING
);
1480 v
->timestamp
= now(CLOCK_MONOTONIC
);
1482 while (v
->state
== VARLINK_CALLING
) {
1484 r
= varlink_process(v
);
1490 r
= varlink_wait(v
, USEC_INFINITY
);
1497 case VARLINK_CALLED
:
1500 json_variant_unref(v
->reply
);
1501 v
->reply
= TAKE_PTR(v
->current
);
1503 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
1504 assert(v
->n_pending
== 1);
1508 *ret_parameters
= json_variant_by_key(v
->reply
, "parameters");
1510 *ret_error_id
= json_variant_string(json_variant_by_key(v
->reply
, "error"));
1516 case VARLINK_PENDING_DISCONNECT
:
1517 case VARLINK_DISCONNECTED
:
1518 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ECONNRESET
), "Connection was closed.");
1520 case VARLINK_PENDING_TIMEOUT
:
1521 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ETIME
), "Connection timed out.");
1524 assert_not_reached("Unexpected state after method call.");
1531 JsonVariant
**ret_parameters
,
1532 const char **ret_error_id
,
1533 VarlinkReplyFlags
*ret_flags
, ...) {
1535 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1539 assert_return(v
, -EINVAL
);
1541 va_start(ap
, ret_flags
);
1542 r
= json_buildv(¶meters
, ap
);
1546 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1548 return varlink_call(v
, method
, parameters
, ret_parameters
, ret_error_id
, ret_flags
);
1551 int varlink_reply(Varlink
*v
, JsonVariant
*parameters
) {
1552 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1555 assert_return(v
, -EINVAL
);
1557 if (v
->state
== VARLINK_DISCONNECTED
)
1559 if (!IN_SET(v
->state
,
1560 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1561 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1564 r
= varlink_sanitize_parameters(¶meters
);
1566 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1568 r
= json_build(&m
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1570 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1572 r
= varlink_enqueue_json(v
, m
);
1574 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1576 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1577 /* We just replied to a method call that was let hanging for a while (i.e. we were outside of
1578 * the varlink_dispatch_method() stack frame), which means with this reply we are ready to
1579 * process further messages. */
1580 v
->current
= json_variant_unref(v
->current
);
1581 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1583 /* We replied to a method call from within the varlink_dispatch_method() stack frame), which
1584 * means we should it handle the rest of the state engine. */
1585 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1590 int varlink_replyb(Varlink
*v
, ...) {
1591 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1595 assert_return(v
, -EINVAL
);
1598 r
= json_buildv(¶meters
, ap
);
1604 return varlink_reply(v
, parameters
);
1607 int varlink_error(Varlink
*v
, const char *error_id
, JsonVariant
*parameters
) {
1608 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1611 assert_return(v
, -EINVAL
);
1612 assert_return(error_id
, -EINVAL
);
1614 if (v
->state
== VARLINK_DISCONNECTED
)
1615 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1616 if (!IN_SET(v
->state
,
1617 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1618 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1619 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1621 r
= varlink_sanitize_parameters(¶meters
);
1623 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1625 r
= json_build(&m
, JSON_BUILD_OBJECT(
1626 JSON_BUILD_PAIR("error", JSON_BUILD_STRING(error_id
)),
1627 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1629 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1631 r
= varlink_enqueue_json(v
, m
);
1633 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1635 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1636 v
->current
= json_variant_unref(v
->current
);
1637 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1639 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1644 int varlink_errorb(Varlink
*v
, const char *error_id
, ...) {
1645 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1649 assert_return(v
, -EINVAL
);
1650 assert_return(error_id
, -EINVAL
);
1652 va_start(ap
, error_id
);
1653 r
= json_buildv(¶meters
, ap
);
1657 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1659 return varlink_error(v
, error_id
, parameters
);
1662 int varlink_error_invalid_parameter(Varlink
*v
, JsonVariant
*parameters
) {
1664 assert_return(v
, -EINVAL
);
1665 assert_return(parameters
, -EINVAL
);
1667 /* We expect to be called in one of two ways: the 'parameters' argument is a string variant in which
1668 * case it is the parameter key name that is invalid. Or the 'parameters' argument is an object
1669 * variant in which case we'll pull out the first key. The latter mode is useful in functions that
1670 * don't expect any arguments. */
1672 if (json_variant_is_string(parameters
))
1673 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
, parameters
);
1675 if (json_variant_is_object(parameters
) &&
1676 json_variant_elements(parameters
) > 0)
1677 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
,
1678 json_variant_by_index(parameters
, 0));
1683 int varlink_error_errno(Varlink
*v
, int error
) {
1684 return varlink_errorb(
1686 VARLINK_ERROR_SYSTEM
,
1687 JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(abs(error
)))));
1690 int varlink_notify(Varlink
*v
, JsonVariant
*parameters
) {
1691 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1694 assert_return(v
, -EINVAL
);
1696 if (v
->state
== VARLINK_DISCONNECTED
)
1697 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1698 if (!IN_SET(v
->state
, VARLINK_PROCESSING_METHOD_MORE
, VARLINK_PENDING_METHOD_MORE
))
1699 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1701 r
= varlink_sanitize_parameters(¶meters
);
1703 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1705 r
= json_build(&m
, JSON_BUILD_OBJECT(
1706 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1707 JSON_BUILD_PAIR("continues", JSON_BUILD_BOOLEAN(true))));
1709 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1711 r
= varlink_enqueue_json(v
, m
);
1713 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1715 /* No state change, as more is coming */
1719 int varlink_notifyb(Varlink
*v
, ...) {
1720 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1724 assert_return(v
, -EINVAL
);
1727 r
= json_buildv(¶meters
, ap
);
1731 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1733 return varlink_notify(v
, parameters
);
1736 int varlink_bind_reply(Varlink
*v
, VarlinkReply callback
) {
1737 assert_return(v
, -EINVAL
);
1739 if (callback
&& v
->reply_callback
&& callback
!= v
->reply_callback
)
1740 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
1742 v
->reply_callback
= callback
;
1747 void* varlink_set_userdata(Varlink
*v
, void *userdata
) {
1750 assert_return(v
, NULL
);
1753 v
->userdata
= userdata
;
1758 void* varlink_get_userdata(Varlink
*v
) {
1759 assert_return(v
, NULL
);
1764 static int varlink_acquire_ucred(Varlink
*v
) {
1769 if (v
->ucred_acquired
)
1772 r
= getpeercred(v
->fd
, &v
->ucred
);
1776 v
->ucred_acquired
= true;
1780 int varlink_get_peer_uid(Varlink
*v
, uid_t
*ret
) {
1783 assert_return(v
, -EINVAL
);
1784 assert_return(ret
, -EINVAL
);
1786 r
= varlink_acquire_ucred(v
);
1788 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1790 if (!uid_is_valid(v
->ucred
.uid
))
1791 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1793 *ret
= v
->ucred
.uid
;
1797 int varlink_get_peer_pid(Varlink
*v
, pid_t
*ret
) {
1800 assert_return(v
, -EINVAL
);
1801 assert_return(ret
, -EINVAL
);
1803 r
= varlink_acquire_ucred(v
);
1805 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1807 if (!pid_is_valid(v
->ucred
.pid
))
1808 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1810 *ret
= v
->ucred
.pid
;
1814 int varlink_set_relative_timeout(Varlink
*v
, usec_t timeout
) {
1815 assert_return(v
, -EINVAL
);
1816 assert_return(timeout
> 0, -EINVAL
);
1818 v
->timeout
= timeout
;
1822 VarlinkServer
*varlink_get_server(Varlink
*v
) {
1823 assert_return(v
, NULL
);
1828 int varlink_set_description(Varlink
*v
, const char *description
) {
1829 assert_return(v
, -EINVAL
);
1831 return free_and_strdup(&v
->description
, description
);
1834 static int io_callback(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1835 Varlink
*v
= userdata
;
1840 handle_revents(v
, revents
);
1841 (void) varlink_process(v
);
1846 static int time_callback(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
1847 Varlink
*v
= userdata
;
1852 (void) varlink_process(v
);
1856 static int defer_callback(sd_event_source
*s
, void *userdata
) {
1857 Varlink
*v
= userdata
;
1862 (void) varlink_process(v
);
1866 static int prepare_callback(sd_event_source
*s
, void *userdata
) {
1867 Varlink
*v
= userdata
;
1875 e
= varlink_get_events(v
);
1879 r
= sd_event_source_set_io_events(v
->io_event_source
, e
);
1881 return varlink_log_errno(v
, r
, "Failed to set source events: %m");
1883 r
= varlink_get_timeout(v
, &until
);
1886 have_timeout
= r
> 0;
1889 r
= sd_event_source_set_time(v
->time_event_source
, until
);
1891 return varlink_log_errno(v
, r
, "Failed to set source time: %m");
1894 r
= sd_event_source_set_enabled(v
->time_event_source
, have_timeout
? SD_EVENT_ON
: SD_EVENT_OFF
);
1896 return varlink_log_errno(v
, r
, "Failed to enable event source: %m");
1901 static int quit_callback(sd_event_source
*event
, void *userdata
) {
1902 Varlink
*v
= userdata
;
1913 int varlink_attach_event(Varlink
*v
, sd_event
*e
, int64_t priority
) {
1916 assert_return(v
, -EINVAL
);
1917 assert_return(!v
->event
, -EBUSY
);
1920 v
->event
= sd_event_ref(e
);
1922 r
= sd_event_default(&v
->event
);
1924 return varlink_log_errno(v
, r
, "Failed to create event source: %m");
1927 r
= sd_event_add_time(v
->event
, &v
->time_event_source
, CLOCK_MONOTONIC
, 0, 0, time_callback
, v
);
1931 r
= sd_event_source_set_priority(v
->time_event_source
, priority
);
1935 (void) sd_event_source_set_description(v
->time_event_source
, "varlink-time");
1937 r
= sd_event_add_exit(v
->event
, &v
->quit_event_source
, quit_callback
, v
);
1941 r
= sd_event_source_set_priority(v
->quit_event_source
, priority
);
1945 (void) sd_event_source_set_description(v
->quit_event_source
, "varlink-quit");
1947 r
= sd_event_add_io(v
->event
, &v
->io_event_source
, v
->fd
, 0, io_callback
, v
);
1951 r
= sd_event_source_set_prepare(v
->io_event_source
, prepare_callback
);
1955 r
= sd_event_source_set_priority(v
->io_event_source
, priority
);
1959 (void) sd_event_source_set_description(v
->io_event_source
, "varlink-io");
1961 r
= sd_event_add_defer(v
->event
, &v
->defer_event_source
, defer_callback
, v
);
1965 r
= sd_event_source_set_priority(v
->defer_event_source
, priority
);
1969 (void) sd_event_source_set_description(v
->defer_event_source
, "varlink-defer");
1974 varlink_log_errno(v
, r
, "Failed to setup event source: %m");
1975 varlink_detach_event(v
);
1979 void varlink_detach_event(Varlink
*v
) {
1983 varlink_detach_event_sources(v
);
1985 v
->event
= sd_event_unref(v
->event
);
1988 sd_event
*varlink_get_event(Varlink
*v
) {
1989 assert_return(v
, NULL
);
1994 int varlink_server_new(VarlinkServer
**ret
, VarlinkServerFlags flags
) {
1997 assert_return(ret
, -EINVAL
);
1998 assert_return((flags
& ~_VARLINK_SERVER_FLAGS_ALL
) == 0, -EINVAL
);
2000 s
= new(VarlinkServer
, 1);
2002 return log_oom_debug();
2004 *s
= (VarlinkServer
) {
2007 .connections_max
= varlink_server_connections_max(NULL
),
2008 .connections_per_uid_max
= varlink_server_connections_per_uid_max(NULL
),
2015 static VarlinkServer
* varlink_server_destroy(VarlinkServer
*s
) {
2021 varlink_server_shutdown(s
);
2023 while ((m
= hashmap_steal_first_key(s
->methods
)))
2026 hashmap_free(s
->methods
);
2027 hashmap_free(s
->by_uid
);
2029 sd_event_unref(s
->event
);
2031 free(s
->description
);
2036 DEFINE_TRIVIAL_REF_UNREF_FUNC(VarlinkServer
, varlink_server
, varlink_server_destroy
);
2038 static int validate_connection(VarlinkServer
*server
, const struct ucred
*ucred
) {
2044 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ROOT_ONLY
))
2045 allowed
= ucred
->uid
== 0;
2047 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_MYSELF_ONLY
))
2048 allowed
= allowed
> 0 || ucred
->uid
== getuid();
2050 if (allowed
== 0) { /* Allow access when it is explicitly allowed or when neither
2051 * VARLINK_SERVER_ROOT_ONLY nor VARLINK_SERVER_MYSELF_ONLY are specified. */
2052 varlink_server_log(server
, "Unprivileged client attempted connection, refusing.");
2056 if (server
->n_connections
>= server
->connections_max
) {
2057 varlink_server_log(server
, "Connection limit of %u reached, refusing.", server
->connections_max
);
2061 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2064 if (!uid_is_valid(ucred
->uid
)) {
2065 varlink_server_log(server
, "Client with invalid UID attempted connection, refusing.");
2069 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2070 if (c
>= server
->connections_per_uid_max
) {
2071 varlink_server_log(server
, "Per-UID connection limit of %u reached, refusing.",
2072 server
->connections_per_uid_max
);
2080 static int count_connection(VarlinkServer
*server
, struct ucred
*ucred
) {
2087 server
->n_connections
++;
2089 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2090 r
= hashmap_ensure_allocated(&server
->by_uid
, NULL
);
2092 return log_debug_errno(r
, "Failed to allocate UID hash table: %m");
2094 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2096 varlink_server_log(server
, "Connections of user " UID_FMT
": %u (of %u max)",
2097 ucred
->uid
, c
, server
->connections_per_uid_max
);
2099 r
= hashmap_replace(server
->by_uid
, UID_TO_PTR(ucred
->uid
), UINT_TO_PTR(c
+ 1));
2101 return log_debug_errno(r
, "Failed to increment counter in UID hash table: %m");
2107 int varlink_server_add_connection(VarlinkServer
*server
, int fd
, Varlink
**ret
) {
2108 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
2109 bool ucred_acquired
;
2113 assert_return(server
, -EINVAL
);
2114 assert_return(fd
>= 0, -EBADF
);
2116 if ((server
->flags
& (VARLINK_SERVER_ROOT_ONLY
|VARLINK_SERVER_ACCOUNT_UID
)) != 0) {
2117 r
= getpeercred(fd
, &ucred
);
2119 return varlink_server_log_errno(server
, r
, "Failed to acquire peer credentials of incoming socket, refusing: %m");
2121 ucred_acquired
= true;
2123 r
= validate_connection(server
, &ucred
);
2129 ucred_acquired
= false;
2131 r
= varlink_new(&v
);
2133 return varlink_server_log_errno(server
, r
, "Failed to allocate connection object: %m");
2135 r
= count_connection(server
, &ucred
);
2140 if (server
->flags
& VARLINK_SERVER_INHERIT_USERDATA
)
2141 v
->userdata
= server
->userdata
;
2143 if (ucred_acquired
) {
2145 v
->ucred_acquired
= true;
2148 (void) asprintf(&v
->description
, "%s-%i", server
->description
?: "varlink", v
->fd
);
2150 /* Link up the server and the connection, and take reference in both directions. Note that the
2151 * reference on the connection is left dangling. It will be dropped when the connection is closed,
2152 * which happens in varlink_close(), including in the event loop quit callback. */
2153 v
->server
= varlink_server_ref(server
);
2156 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
2158 if (server
->event
) {
2159 r
= varlink_attach_event(v
, server
->event
, server
->event_priority
);
2161 varlink_log_errno(v
, r
, "Failed to attach new connection: %m");
2162 v
->fd
= -1; /* take the fd out of the connection again */
2174 static int connect_callback(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2175 VarlinkServerSocket
*ss
= userdata
;
2176 _cleanup_close_
int cfd
= -1;
2183 varlink_server_log(ss
->server
, "New incoming connection.");
2185 cfd
= accept4(fd
, NULL
, NULL
, SOCK_NONBLOCK
|SOCK_CLOEXEC
);
2187 if (ERRNO_IS_ACCEPT_AGAIN(errno
))
2190 return varlink_server_log_errno(ss
->server
, errno
, "Failed to accept incoming socket: %m");
2193 r
= varlink_server_add_connection(ss
->server
, cfd
, &v
);
2199 if (ss
->server
->connect_callback
) {
2200 r
= ss
->server
->connect_callback(ss
->server
, v
, ss
->server
->userdata
);
2202 varlink_log_errno(v
, r
, "Connection callback returned error, disconnecting client: %m");
2211 int varlink_server_listen_fd(VarlinkServer
*s
, int fd
) {
2212 _cleanup_free_ VarlinkServerSocket
*ss
= NULL
;
2215 assert_return(s
, -EINVAL
);
2216 assert_return(fd
>= 0, -EBADF
);
2218 r
= fd_nonblock(fd
, true);
2222 ss
= new(VarlinkServerSocket
, 1);
2224 return log_oom_debug();
2226 *ss
= (VarlinkServerSocket
) {
2232 r
= sd_event_add_io(s
->event
, &ss
->event_source
, fd
, EPOLLIN
, connect_callback
, ss
);
2236 r
= sd_event_source_set_priority(ss
->event_source
, s
->event_priority
);
2241 LIST_PREPEND(sockets
, s
->sockets
, TAKE_PTR(ss
));
2245 int varlink_server_listen_address(VarlinkServer
*s
, const char *address
, mode_t m
) {
2246 union sockaddr_union sockaddr
;
2247 socklen_t sockaddr_len
;
2248 _cleanup_close_
int fd
= -1;
2251 assert_return(s
, -EINVAL
);
2252 assert_return(address
, -EINVAL
);
2253 assert_return((m
& ~0777) == 0, -EINVAL
);
2255 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
2260 fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2264 fd
= fd_move_above_stdio(fd
);
2266 (void) sockaddr_un_unlink(&sockaddr
.un
);
2268 RUN_WITH_UMASK(~m
& 0777) {
2269 r
= mac_selinux_bind(fd
, &sockaddr
.sa
, sockaddr_len
);
2274 if (listen(fd
, SOMAXCONN
) < 0)
2277 r
= varlink_server_listen_fd(s
, fd
);
2285 void* varlink_server_set_userdata(VarlinkServer
*s
, void *userdata
) {
2288 assert_return(s
, NULL
);
2291 s
->userdata
= userdata
;
2296 void* varlink_server_get_userdata(VarlinkServer
*s
) {
2297 assert_return(s
, NULL
);
2302 static VarlinkServerSocket
* varlink_server_socket_destroy(VarlinkServerSocket
*ss
) {
2307 LIST_REMOVE(sockets
, ss
->server
->sockets
, ss
);
2309 sd_event_source_disable_unref(ss
->event_source
);
2317 int varlink_server_shutdown(VarlinkServer
*s
) {
2318 assert_return(s
, -EINVAL
);
2321 varlink_server_socket_destroy(s
->sockets
);
2326 int varlink_server_attach_event(VarlinkServer
*s
, sd_event
*e
, int64_t priority
) {
2327 VarlinkServerSocket
*ss
;
2330 assert_return(s
, -EINVAL
);
2331 assert_return(!s
->event
, -EBUSY
);
2334 s
->event
= sd_event_ref(e
);
2336 r
= sd_event_default(&s
->event
);
2341 LIST_FOREACH(sockets
, ss
, s
->sockets
) {
2342 assert(!ss
->event_source
);
2344 r
= sd_event_add_io(s
->event
, &ss
->event_source
, ss
->fd
, EPOLLIN
, connect_callback
, ss
);
2348 r
= sd_event_source_set_priority(ss
->event_source
, priority
);
2353 s
->event_priority
= priority
;
2357 varlink_server_detach_event(s
);
2361 int varlink_server_detach_event(VarlinkServer
*s
) {
2362 VarlinkServerSocket
*ss
;
2364 assert_return(s
, -EINVAL
);
2366 LIST_FOREACH(sockets
, ss
, s
->sockets
) {
2368 if (!ss
->event_source
)
2371 (void) sd_event_source_set_enabled(ss
->event_source
, SD_EVENT_OFF
);
2372 ss
->event_source
= sd_event_source_unref(ss
->event_source
);
2375 sd_event_unref(s
->event
);
2379 sd_event
*varlink_server_get_event(VarlinkServer
*s
) {
2380 assert_return(s
, NULL
);
2385 int varlink_server_bind_method(VarlinkServer
*s
, const char *method
, VarlinkMethod callback
) {
2386 _cleanup_free_
char *m
= NULL
;
2389 assert_return(s
, -EINVAL
);
2390 assert_return(method
, -EINVAL
);
2391 assert_return(callback
, -EINVAL
);
2393 if (startswith(method
, "org.varlink.service."))
2394 return log_debug_errno(SYNTHETIC_ERRNO(EEXIST
), "Cannot bind server to '%s'.", method
);
2398 return log_oom_debug();
2400 r
= hashmap_ensure_put(&s
->methods
, &string_hash_ops
, m
, callback
);
2402 return log_oom_debug();
2404 return log_debug_errno(r
, "Failed to register callback: %m");
2411 int varlink_server_bind_method_many_internal(VarlinkServer
*s
, ...) {
2415 assert_return(s
, -EINVAL
);
2419 VarlinkMethod callback
;
2422 method
= va_arg(ap
, const char *);
2426 callback
= va_arg(ap
, VarlinkMethod
);
2428 r
= varlink_server_bind_method(s
, method
, callback
);
2437 int varlink_server_bind_connect(VarlinkServer
*s
, VarlinkConnect callback
) {
2438 assert_return(s
, -EINVAL
);
2440 if (callback
&& s
->connect_callback
&& callback
!= s
->connect_callback
)
2441 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2443 s
->connect_callback
= callback
;
2447 int varlink_server_bind_disconnect(VarlinkServer
*s
, VarlinkDisconnect callback
) {
2448 assert_return(s
, -EINVAL
);
2450 if (callback
&& s
->disconnect_callback
&& callback
!= s
->disconnect_callback
)
2451 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2453 s
->disconnect_callback
= callback
;
2457 unsigned varlink_server_connections_max(VarlinkServer
*s
) {
2460 /* If a server is specified, return the setting for that server, otherwise the default value */
2462 return s
->connections_max
;
2464 dts
= getdtablesize();
2467 /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */
2468 if (VARLINK_DEFAULT_CONNECTIONS_MAX
> (unsigned) dts
/ 4 * 3)
2471 return VARLINK_DEFAULT_CONNECTIONS_MAX
;
2474 unsigned varlink_server_connections_per_uid_max(VarlinkServer
*s
) {
2478 return s
->connections_per_uid_max
;
2480 /* Make sure to never use up more than ¾th of available connections for a single user */
2481 m
= varlink_server_connections_max(NULL
);
2482 if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
> m
)
2485 return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
;
2488 int varlink_server_set_connections_per_uid_max(VarlinkServer
*s
, unsigned m
) {
2489 assert_return(s
, -EINVAL
);
2490 assert_return(m
> 0, -EINVAL
);
2492 s
->connections_per_uid_max
= m
;
2496 int varlink_server_set_connections_max(VarlinkServer
*s
, unsigned m
) {
2497 assert_return(s
, -EINVAL
);
2498 assert_return(m
> 0, -EINVAL
);
2500 s
->connections_max
= m
;
2504 unsigned varlink_server_current_connections(VarlinkServer
*s
) {
2505 assert_return(s
, UINT_MAX
);
2507 return s
->n_connections
;
2510 int varlink_server_set_description(VarlinkServer
*s
, const char *description
) {
2511 assert_return(s
, -EINVAL
);
2513 return free_and_strdup(&s
->description
, description
);