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
= UCRED_INVALID
,
263 .timestamp
= USEC_INFINITY
,
264 .timeout
= VARLINK_DEFAULT_TIMEOUT_USEC
271 int varlink_connect_address(Varlink
**ret
, const char *address
) {
272 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
273 union sockaddr_union sockaddr
;
276 assert_return(ret
, -EINVAL
);
277 assert_return(address
, -EINVAL
);
281 return log_debug_errno(r
, "Failed to create varlink object: %m");
283 v
->fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
285 return log_debug_errno(errno
, "Failed to create AF_UNIX socket: %m");
287 v
->fd
= fd_move_above_stdio(v
->fd
);
289 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
291 if (r
!= -ENAMETOOLONG
)
292 return log_debug_errno(r
, "Failed to set socket address '%s': %m", address
);
294 /* This is a file system path, and too long to fit into sockaddr_un. Let's connect via O_PATH
297 r
= connect_unix_path(v
->fd
, AT_FDCWD
, address
);
299 r
= RET_NERRNO(connect(v
->fd
, &sockaddr
.sa
, r
));
302 if (!IN_SET(r
, -EAGAIN
, -EINPROGRESS
))
303 return log_debug_errno(r
, "Failed to connect to %s: %m", address
);
305 v
->connecting
= true; /* We are asynchronously connecting, i.e. the connect() is being
306 * processed in the background. As long as that's the case the socket
307 * is in a special state: it's there, we can poll it for EPOLLOUT, but
308 * if we attempt to write() to it before we see EPOLLOUT we'll get
309 * ENOTCONN (and not EAGAIN, like we would for a normal connected
310 * socket that isn't writable at the moment). Since ENOTCONN on write()
311 * hence can mean two different things (i.e. connection not complete
312 * yet vs. already disconnected again), we store as a boolean whether
313 * we are still in connect(). */
316 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
322 int varlink_connect_fd(Varlink
**ret
, int fd
) {
326 assert_return(ret
, -EINVAL
);
327 assert_return(fd
>= 0, -EBADF
);
329 r
= fd_nonblock(fd
, true);
331 return log_debug_errno(r
, "Failed to make fd %d nonblocking: %m", fd
);
335 return log_debug_errno(r
, "Failed to create varlink object: %m");
338 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
340 /* Note that if this function is called we assume the passed socket (if it is one) is already
341 * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that
342 * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket
343 * until the connection is fully set up. Behaviour here is hence a bit different from
344 * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and
345 * avoid doing write() on it before we saw EPOLLOUT for the first time. */
351 static void varlink_detach_event_sources(Varlink
*v
) {
354 v
->io_event_source
= sd_event_source_disable_unref(v
->io_event_source
);
355 v
->time_event_source
= sd_event_source_disable_unref(v
->time_event_source
);
356 v
->quit_event_source
= sd_event_source_disable_unref(v
->quit_event_source
);
357 v
->defer_event_source
= sd_event_source_disable_unref(v
->defer_event_source
);
360 static void varlink_clear(Varlink
*v
) {
363 varlink_detach_event_sources(v
);
365 v
->fd
= safe_close(v
->fd
);
367 v
->input_buffer
= mfree(v
->input_buffer
);
368 v
->output_buffer
= mfree(v
->output_buffer
);
370 v
->current
= json_variant_unref(v
->current
);
371 v
->reply
= json_variant_unref(v
->reply
);
373 v
->event
= sd_event_unref(v
->event
);
376 static Varlink
* varlink_destroy(Varlink
*v
) {
380 /* If this is called the server object must already been unreffed here. Why that? because when we
381 * linked up the varlink connection with the server object we took one ref in each direction */
386 free(v
->description
);
390 DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink
, varlink
, varlink_destroy
);
392 static int varlink_test_disconnect(Varlink
*v
) {
395 /* Tests whether we the connection has been terminated. We are careful to not stop processing it
396 * prematurely, since we want to handle half-open connections as well as possible and want to flush
397 * out and read data before we close down if we can. */
399 /* Already disconnected? */
400 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
403 /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */
407 /* Still something to write and we can write? Stay around */
408 if (v
->output_buffer_size
> 0 && !v
->write_disconnected
)
411 /* Both sides gone already? Then there's no need to stick around */
412 if (v
->read_disconnected
&& v
->write_disconnected
)
415 /* If we are waiting for incoming data but the read side is shut down, disconnect. */
416 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) && v
->read_disconnected
)
419 /* Similar, if are a client that hasn't written anything yet but the write side is dead, also
420 * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side
421 * being down if we never wrote anything. */
422 if (IN_SET(v
->state
, VARLINK_IDLE_CLIENT
) && (v
->write_disconnected
|| v
->got_pollhup
))
425 /* We are on the server side and still want to send out more replies, but we saw POLLHUP already, and
426 * either got no buffered bytes to write anymore or already saw a write error. In that case we should
427 * shut down the varlink link. */
428 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
) && (v
->write_disconnected
|| v
->output_buffer_size
== 0) && v
->got_pollhup
)
434 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
438 static int varlink_write(Varlink
*v
) {
443 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
445 if (v
->connecting
) /* Writing while we are still wait for a non-blocking connect() to complete will
446 * result in ENOTCONN, hence exit early here */
448 if (v
->output_buffer_size
== 0)
450 if (v
->write_disconnected
)
455 /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible
456 * with non-socket IO, hence fall back automatically.
458 * Use a local variable to help gcc figure out that we set 'n' in all cases. */
459 bool prefer_write
= v
->prefer_read_write
;
461 n
= send(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
, MSG_DONTWAIT
|MSG_NOSIGNAL
);
462 if (n
< 0 && errno
== ENOTSOCK
)
463 prefer_write
= v
->prefer_read_write
= true;
466 n
= write(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
);
471 if (ERRNO_IS_DISCONNECT(errno
)) {
472 /* If we get informed about a disconnect on write, then let's remember that, but not
473 * act on it just yet. Let's wait for read() to report the issue first. */
474 v
->write_disconnected
= true;
481 v
->output_buffer_size
-= n
;
483 if (v
->output_buffer_size
== 0)
484 v
->output_buffer_index
= 0;
486 v
->output_buffer_index
+= n
;
488 v
->timestamp
= now(CLOCK_MONOTONIC
);
492 static int varlink_read(Varlink
*v
) {
498 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
))
500 if (v
->connecting
) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */
504 if (v
->input_buffer_unscanned
> 0)
506 if (v
->read_disconnected
)
509 if (v
->input_buffer_size
>= VARLINK_BUFFER_MAX
)
514 if (MALLOC_SIZEOF_SAFE(v
->input_buffer
) <= v
->input_buffer_index
+ v
->input_buffer_size
) {
517 add
= MIN(VARLINK_BUFFER_MAX
- v
->input_buffer_size
, VARLINK_READ_SIZE
);
519 if (v
->input_buffer_index
== 0) {
521 if (!GREEDY_REALLOC(v
->input_buffer
, v
->input_buffer_size
+ add
))
527 b
= new(char, v
->input_buffer_size
+ add
);
531 memcpy(b
, v
->input_buffer
+ v
->input_buffer_index
, v
->input_buffer_size
);
533 free_and_replace(v
->input_buffer
, b
);
534 v
->input_buffer_index
= 0;
538 rs
= MALLOC_SIZEOF_SAFE(v
->input_buffer
) - (v
->input_buffer_index
+ v
->input_buffer_size
);
540 bool prefer_read
= v
->prefer_read_write
;
542 n
= recv(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
, MSG_DONTWAIT
);
543 if (n
< 0 && errno
== ENOTSOCK
)
544 prefer_read
= v
->prefer_read_write
= true;
547 n
= read(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
);
552 if (ERRNO_IS_DISCONNECT(errno
)) {
553 v
->read_disconnected
= true;
559 if (n
== 0) { /* EOF */
560 v
->read_disconnected
= true;
564 v
->input_buffer_size
+= n
;
565 v
->input_buffer_unscanned
+= n
;
570 static int varlink_parse_message(Varlink
*v
) {
571 const char *e
, *begin
;
579 if (v
->input_buffer_unscanned
<= 0)
582 assert(v
->input_buffer_unscanned
<= v
->input_buffer_size
);
583 assert(v
->input_buffer_index
+ v
->input_buffer_size
<= MALLOC_SIZEOF_SAFE(v
->input_buffer
));
585 begin
= v
->input_buffer
+ v
->input_buffer_index
;
587 e
= memchr(begin
+ v
->input_buffer_size
- v
->input_buffer_unscanned
, 0, v
->input_buffer_unscanned
);
589 v
->input_buffer_unscanned
= 0;
595 varlink_log(v
, "New incoming message: %s", begin
); /* FIXME: should we output the whole message here before validation?
596 * This may produce a non-printable journal entry if the message
597 * is invalid. We may also expose privileged information. */
599 r
= json_parse(begin
, 0, &v
->current
, NULL
, NULL
);
601 /* If we encounter a parse failure flush all data. We cannot possibly recover from this,
602 * hence drop all buffered data now. */
603 v
->input_buffer_index
= v
->input_buffer_size
= v
->input_buffer_unscanned
= 0;
604 return varlink_log_errno(v
, r
, "Failed to parse JSON: %m");
607 v
->input_buffer_size
-= sz
;
609 if (v
->input_buffer_size
== 0)
610 v
->input_buffer_index
= 0;
612 v
->input_buffer_index
+= sz
;
614 v
->input_buffer_unscanned
= v
->input_buffer_size
;
618 static int varlink_test_timeout(Varlink
*v
) {
621 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
623 if (v
->timeout
== USEC_INFINITY
)
626 if (now(CLOCK_MONOTONIC
) < usec_add(v
->timestamp
, v
->timeout
))
629 varlink_set_state(v
, VARLINK_PENDING_TIMEOUT
);
634 static int varlink_dispatch_local_error(Varlink
*v
, const char *error
) {
640 if (!v
->reply_callback
)
643 r
= v
->reply_callback(v
, NULL
, error
, VARLINK_REPLY_ERROR
|VARLINK_REPLY_LOCAL
, v
->userdata
);
645 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
650 static int varlink_dispatch_timeout(Varlink
*v
) {
653 if (v
->state
!= VARLINK_PENDING_TIMEOUT
)
656 varlink_set_state(v
, VARLINK_PROCESSING_TIMEOUT
);
657 varlink_dispatch_local_error(v
, VARLINK_ERROR_TIMEOUT
);
663 static int varlink_dispatch_disconnect(Varlink
*v
) {
666 if (v
->state
!= VARLINK_PENDING_DISCONNECT
)
669 varlink_set_state(v
, VARLINK_PROCESSING_DISCONNECT
);
670 varlink_dispatch_local_error(v
, VARLINK_ERROR_DISCONNECTED
);
676 static int varlink_sanitize_parameters(JsonVariant
**v
) {
679 /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */
681 return json_variant_new_object(v
, NULL
, 0);
682 else if (!json_variant_is_object(*v
))
688 static int varlink_dispatch_reply(Varlink
*v
) {
689 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
690 VarlinkReplyFlags flags
= 0;
691 const char *error
= NULL
;
698 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
703 assert(v
->n_pending
> 0);
705 if (!json_variant_is_object(v
->current
))
708 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
710 if (streq(k
, "error")) {
713 if (!json_variant_is_string(e
))
716 error
= json_variant_string(e
);
717 flags
|= VARLINK_REPLY_ERROR
;
719 } else if (streq(k
, "parameters")) {
722 if (!json_variant_is_object(e
))
725 parameters
= json_variant_ref(e
);
727 } else if (streq(k
, "continues")) {
728 if (FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
731 if (!json_variant_is_boolean(e
))
734 if (json_variant_boolean(e
))
735 flags
|= VARLINK_REPLY_CONTINUES
;
740 /* Replies with 'continue' set are only OK if we set 'more' when the method call was initiated */
741 if (v
->state
!= VARLINK_AWAITING_REPLY_MORE
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
744 /* An error is final */
745 if (error
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
748 r
= varlink_sanitize_parameters(¶meters
);
752 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
)) {
753 varlink_set_state(v
, VARLINK_PROCESSING_REPLY
);
755 if (v
->reply_callback
) {
756 r
= v
->reply_callback(v
, parameters
, error
, flags
, v
->userdata
);
758 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
761 v
->current
= json_variant_unref(v
->current
);
763 if (v
->state
== VARLINK_PROCESSING_REPLY
) {
765 assert(v
->n_pending
> 0);
767 if (!FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
771 FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
) ? VARLINK_AWAITING_REPLY_MORE
:
772 v
->n_pending
== 0 ? VARLINK_IDLE_CLIENT
: VARLINK_AWAITING_REPLY
);
775 assert(v
->state
== VARLINK_CALLING
);
776 varlink_set_state(v
, VARLINK_CALLED
);
782 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
783 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
789 static int varlink_dispatch_method(Varlink
*v
) {
790 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
791 VarlinkMethodFlags flags
= 0;
792 const char *method
= NULL
, *error
;
794 VarlinkMethod callback
;
800 if (v
->state
!= VARLINK_IDLE_SERVER
)
805 if (!json_variant_is_object(v
->current
))
808 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
810 if (streq(k
, "method")) {
813 if (!json_variant_is_string(e
))
816 method
= json_variant_string(e
);
818 } else if (streq(k
, "parameters")) {
821 if (!json_variant_is_object(e
))
824 parameters
= json_variant_ref(e
);
826 } else if (streq(k
, "oneway")) {
828 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
831 if (!json_variant_is_boolean(e
))
834 if (json_variant_boolean(e
))
835 flags
|= VARLINK_METHOD_ONEWAY
;
837 } else if (streq(k
, "more")) {
839 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
842 if (!json_variant_is_boolean(e
))
845 if (json_variant_boolean(e
))
846 flags
|= VARLINK_METHOD_MORE
;
855 r
= varlink_sanitize_parameters(¶meters
);
859 varlink_set_state(v
, (flags
& VARLINK_METHOD_MORE
) ? VARLINK_PROCESSING_METHOD_MORE
:
860 (flags
& VARLINK_METHOD_ONEWAY
) ? VARLINK_PROCESSING_METHOD_ONEWAY
:
861 VARLINK_PROCESSING_METHOD
);
865 if (STR_IN_SET(method
, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) {
866 /* For now, we don't implement a single of varlink's own methods */
868 error
= VARLINK_ERROR_METHOD_NOT_IMPLEMENTED
;
869 } else if (startswith(method
, "org.varlink.service.")) {
871 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
873 callback
= hashmap_get(v
->server
->methods
, method
);
874 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
878 r
= callback(v
, parameters
, flags
, v
->userdata
);
880 log_debug_errno(r
, "Callback for %s returned error: %m", method
);
882 /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */
883 if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
884 r
= varlink_error_errno(v
, r
);
889 } else if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
892 r
= varlink_errorb(v
, error
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
))));
899 case VARLINK_PROCESSED_METHOD
: /* Method call is fully processed */
900 case VARLINK_PROCESSING_METHOD_ONEWAY
: /* ditto */
901 v
->current
= json_variant_unref(v
->current
);
902 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
905 case VARLINK_PROCESSING_METHOD
: /* Method call wasn't replied to, will be replied to later */
906 varlink_set_state(v
, VARLINK_PENDING_METHOD
);
909 case VARLINK_PROCESSING_METHOD_MORE
: /* No reply for a "more" message was sent, more to come */
910 varlink_set_state(v
, VARLINK_PENDING_METHOD_MORE
);
914 assert_not_reached();
924 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
925 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
931 int varlink_process(Varlink
*v
) {
934 assert_return(v
, -EINVAL
);
936 if (v
->state
== VARLINK_DISCONNECTED
)
937 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
941 r
= varlink_write(v
);
943 varlink_log_errno(v
, r
, "Write failed: %m");
947 r
= varlink_dispatch_reply(v
);
949 varlink_log_errno(v
, r
, "Reply dispatch failed: %m");
953 r
= varlink_dispatch_method(v
);
955 varlink_log_errno(v
, r
, "Method dispatch failed: %m");
959 r
= varlink_parse_message(v
);
961 varlink_log_errno(v
, r
, "Message parsing failed: %m");
967 varlink_log_errno(v
, r
, "Read failed: %m");
971 r
= varlink_test_disconnect(v
);
976 r
= varlink_dispatch_disconnect(v
);
981 r
= varlink_test_timeout(v
);
986 r
= varlink_dispatch_timeout(v
);
992 if (r
>= 0 && v
->defer_event_source
) {
995 /* If we did some processing, make sure we are called again soon */
996 q
= sd_event_source_set_enabled(v
->defer_event_source
, r
> 0 ? SD_EVENT_ON
: SD_EVENT_OFF
);
998 r
= varlink_log_errno(v
, q
, "Failed to enable deferred event source: %m");
1002 if (VARLINK_STATE_IS_ALIVE(v
->state
))
1003 /* Initiate disconnection */
1004 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
1006 /* We failed while disconnecting, in that case close right away */
1014 static void handle_revents(Varlink
*v
, int revents
) {
1017 if (v
->connecting
) {
1018 /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect()
1019 * to complete on, we know we are ready. We don't read the connection error here though,
1020 * we'll get the error on the next read() or write(). */
1021 if ((revents
& (POLLOUT
|POLLHUP
)) == 0)
1024 varlink_log(v
, "Anynchronous connection completed.");
1025 v
->connecting
= false;
1027 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
1028 * what we can. However, we do care about POLLHUP to detect connection termination even if we
1029 * momentarily don't want to read nor write anything. */
1031 if (!FLAGS_SET(revents
, POLLHUP
))
1034 varlink_log(v
, "Got POLLHUP from socket.");
1035 v
->got_pollhup
= true;
1039 int varlink_wait(Varlink
*v
, usec_t timeout
) {
1043 assert_return(v
, -EINVAL
);
1045 if (v
->state
== VARLINK_DISCONNECTED
)
1046 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1048 r
= varlink_get_timeout(v
, &t
);
1051 if (t
!= USEC_INFINITY
) {
1054 n
= now(CLOCK_MONOTONIC
);
1058 t
= usec_sub_unsigned(t
, n
);
1061 if (timeout
!= USEC_INFINITY
&&
1062 (t
== USEC_INFINITY
|| timeout
< t
))
1065 fd
= varlink_get_fd(v
);
1069 events
= varlink_get_events(v
);
1073 r
= fd_wait_for_event(fd
, events
, t
);
1077 handle_revents(v
, r
);
1081 int varlink_get_fd(Varlink
*v
) {
1083 assert_return(v
, -EINVAL
);
1085 if (v
->state
== VARLINK_DISCONNECTED
)
1086 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1088 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBADF
), "No valid fd.");
1093 int varlink_get_events(Varlink
*v
) {
1096 assert_return(v
, -EINVAL
);
1098 if (v
->state
== VARLINK_DISCONNECTED
)
1099 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1101 if (v
->connecting
) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which
1102 * tells us that the connection is now complete. Before that we should neither
1103 * write() or read() from the fd. */
1106 if (!v
->read_disconnected
&&
1107 IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) &&
1109 v
->input_buffer_unscanned
<= 0)
1112 if (!v
->write_disconnected
&&
1113 v
->output_buffer_size
> 0)
1119 int varlink_get_timeout(Varlink
*v
, usec_t
*ret
) {
1120 assert_return(v
, -EINVAL
);
1122 if (v
->state
== VARLINK_DISCONNECTED
)
1123 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1125 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
) &&
1126 v
->timeout
!= USEC_INFINITY
) {
1128 *ret
= usec_add(v
->timestamp
, v
->timeout
);
1132 *ret
= USEC_INFINITY
;
1137 int varlink_flush(Varlink
*v
) {
1140 assert_return(v
, -EINVAL
);
1142 if (v
->state
== VARLINK_DISCONNECTED
)
1143 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1146 if (v
->output_buffer_size
== 0)
1148 if (v
->write_disconnected
)
1151 r
= varlink_write(v
);
1159 r
= fd_wait_for_event(v
->fd
, POLLOUT
, USEC_INFINITY
);
1161 return varlink_log_errno(v
, r
, "Poll failed on fd: %m");
1165 handle_revents(v
, r
);
1171 static void varlink_detach_server(Varlink
*v
) {
1172 VarlinkServer
*saved_server
;
1178 if (v
->server
->by_uid
&&
1179 v
->ucred_acquired
&&
1180 uid_is_valid(v
->ucred
.uid
)) {
1183 c
= PTR_TO_UINT(hashmap_get(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
)));
1187 (void) hashmap_remove(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
));
1189 (void) hashmap_replace(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
), UINT_TO_PTR(c
- 1));
1192 assert(v
->server
->n_connections
> 0);
1193 v
->server
->n_connections
--;
1195 /* If this is a connection associated to a server, then let's disconnect the server and the
1196 * connection from each other. This drops the dangling reference that connect_callback() set up. But
1197 * before we release the references, let's call the disconnection callback if it is defined. */
1199 saved_server
= TAKE_PTR(v
->server
);
1201 if (saved_server
->disconnect_callback
)
1202 saved_server
->disconnect_callback(saved_server
, v
, saved_server
->userdata
);
1204 varlink_server_unref(saved_server
);
1208 int varlink_close(Varlink
*v
) {
1209 assert_return(v
, -EINVAL
);
1211 if (v
->state
== VARLINK_DISCONNECTED
)
1214 varlink_set_state(v
, VARLINK_DISCONNECTED
);
1216 /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref
1217 * which would destroy us before we can call varlink_clear() */
1219 varlink_detach_server(v
);
1226 Varlink
* varlink_close_unref(Varlink
*v
) {
1230 (void) varlink_close(v
);
1231 return varlink_unref(v
);
1234 Varlink
* varlink_flush_close_unref(Varlink
*v
) {
1238 (void) varlink_flush(v
);
1239 return varlink_close_unref(v
);
1242 static int varlink_enqueue_json(Varlink
*v
, JsonVariant
*m
) {
1243 _cleanup_free_
char *text
= NULL
;
1249 r
= json_variant_format(m
, 0, &text
);
1252 assert(text
[r
] == '\0');
1254 if (v
->output_buffer_size
+ r
+ 1 > VARLINK_BUFFER_MAX
)
1257 varlink_log(v
, "Sending message: %s", text
);
1259 if (v
->output_buffer_size
== 0) {
1261 free_and_replace(v
->output_buffer
, text
);
1263 v
->output_buffer_size
= r
+ 1;
1264 v
->output_buffer_index
= 0;
1266 } else if (v
->output_buffer_index
== 0) {
1268 if (!GREEDY_REALLOC(v
->output_buffer
, v
->output_buffer_size
+ r
+ 1))
1271 memcpy(v
->output_buffer
+ v
->output_buffer_size
, text
, r
+ 1);
1272 v
->output_buffer_size
+= r
+ 1;
1276 const size_t new_size
= v
->output_buffer_size
+ r
+ 1;
1278 n
= new(char, new_size
);
1282 memcpy(mempcpy(n
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
), text
, r
+ 1);
1284 free_and_replace(v
->output_buffer
, n
);
1285 v
->output_buffer_size
= new_size
;
1286 v
->output_buffer_index
= 0;
1292 int varlink_send(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1293 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1296 assert_return(v
, -EINVAL
);
1297 assert_return(method
, -EINVAL
);
1299 if (v
->state
== VARLINK_DISCONNECTED
)
1300 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1302 /* We allow enqueuing multiple method calls at once! */
1303 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1304 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1306 r
= varlink_sanitize_parameters(¶meters
);
1308 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1310 r
= json_build(&m
, JSON_BUILD_OBJECT(
1311 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1312 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1313 JSON_BUILD_PAIR("oneway", JSON_BUILD_BOOLEAN(true))));
1315 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1317 r
= varlink_enqueue_json(v
, m
);
1319 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1321 /* No state change here, this is one-way only after all */
1322 v
->timestamp
= now(CLOCK_MONOTONIC
);
1326 int varlink_sendb(Varlink
*v
, const char *method
, ...) {
1327 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1331 assert_return(v
, -EINVAL
);
1333 va_start(ap
, method
);
1334 r
= json_buildv(¶meters
, ap
);
1338 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1340 return varlink_send(v
, method
, parameters
);
1343 int varlink_invoke(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1344 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1347 assert_return(v
, -EINVAL
);
1348 assert_return(method
, -EINVAL
);
1350 if (v
->state
== VARLINK_DISCONNECTED
)
1351 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1353 /* We allow enqueuing multiple method calls at once! */
1354 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1355 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1357 r
= varlink_sanitize_parameters(¶meters
);
1359 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1361 r
= json_build(&m
, JSON_BUILD_OBJECT(
1362 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1363 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1365 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1367 r
= varlink_enqueue_json(v
, m
);
1369 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1371 varlink_set_state(v
, VARLINK_AWAITING_REPLY
);
1373 v
->timestamp
= now(CLOCK_MONOTONIC
);
1378 int varlink_invokeb(Varlink
*v
, const char *method
, ...) {
1379 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1383 assert_return(v
, -EINVAL
);
1385 va_start(ap
, method
);
1386 r
= json_buildv(¶meters
, ap
);
1390 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1392 return varlink_invoke(v
, method
, parameters
);
1395 int varlink_observe(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1396 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1399 assert_return(v
, -EINVAL
);
1400 assert_return(method
, -EINVAL
);
1402 if (v
->state
== VARLINK_DISCONNECTED
)
1403 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1405 /* Note that we don't allow enqueuing multiple method calls when we are in more/continues mode! We
1406 * thus insist on an idle client here. */
1407 if (v
->state
!= VARLINK_IDLE_CLIENT
)
1408 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1410 r
= varlink_sanitize_parameters(¶meters
);
1412 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1414 r
= json_build(&m
, JSON_BUILD_OBJECT(
1415 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1416 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1417 JSON_BUILD_PAIR("more", JSON_BUILD_BOOLEAN(true))));
1419 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1421 r
= varlink_enqueue_json(v
, m
);
1423 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1425 varlink_set_state(v
, VARLINK_AWAITING_REPLY_MORE
);
1427 v
->timestamp
= now(CLOCK_MONOTONIC
);
1432 int varlink_observeb(Varlink
*v
, const char *method
, ...) {
1433 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1437 assert_return(v
, -EINVAL
);
1439 va_start(ap
, method
);
1440 r
= json_buildv(¶meters
, ap
);
1444 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1446 return varlink_observe(v
, method
, parameters
);
1452 JsonVariant
*parameters
,
1453 JsonVariant
**ret_parameters
,
1454 const char **ret_error_id
,
1455 VarlinkReplyFlags
*ret_flags
) {
1457 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1460 assert_return(v
, -EINVAL
);
1461 assert_return(method
, -EINVAL
);
1463 if (v
->state
== VARLINK_DISCONNECTED
)
1464 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1465 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
))
1466 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1468 assert(v
->n_pending
== 0); /* n_pending can't be > 0 if we are in VARLINK_IDLE_CLIENT state */
1470 r
= varlink_sanitize_parameters(¶meters
);
1472 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1474 r
= json_build(&m
, JSON_BUILD_OBJECT(
1475 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1476 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1478 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1480 r
= varlink_enqueue_json(v
, m
);
1482 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1484 varlink_set_state(v
, VARLINK_CALLING
);
1486 v
->timestamp
= now(CLOCK_MONOTONIC
);
1488 while (v
->state
== VARLINK_CALLING
) {
1490 r
= varlink_process(v
);
1496 r
= varlink_wait(v
, USEC_INFINITY
);
1503 case VARLINK_CALLED
:
1506 json_variant_unref(v
->reply
);
1507 v
->reply
= TAKE_PTR(v
->current
);
1509 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
1510 assert(v
->n_pending
== 1);
1514 *ret_parameters
= json_variant_by_key(v
->reply
, "parameters");
1516 *ret_error_id
= json_variant_string(json_variant_by_key(v
->reply
, "error"));
1522 case VARLINK_PENDING_DISCONNECT
:
1523 case VARLINK_DISCONNECTED
:
1524 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ECONNRESET
), "Connection was closed.");
1526 case VARLINK_PENDING_TIMEOUT
:
1527 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ETIME
), "Connection timed out.");
1530 assert_not_reached();
1537 JsonVariant
**ret_parameters
,
1538 const char **ret_error_id
,
1539 VarlinkReplyFlags
*ret_flags
, ...) {
1541 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1545 assert_return(v
, -EINVAL
);
1547 va_start(ap
, ret_flags
);
1548 r
= json_buildv(¶meters
, ap
);
1552 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1554 return varlink_call(v
, method
, parameters
, ret_parameters
, ret_error_id
, ret_flags
);
1557 int varlink_reply(Varlink
*v
, JsonVariant
*parameters
) {
1558 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1561 assert_return(v
, -EINVAL
);
1563 if (v
->state
== VARLINK_DISCONNECTED
)
1565 if (!IN_SET(v
->state
,
1566 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1567 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1570 r
= varlink_sanitize_parameters(¶meters
);
1572 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1574 r
= json_build(&m
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1576 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1578 r
= varlink_enqueue_json(v
, m
);
1580 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1582 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1583 /* We just replied to a method call that was let hanging for a while (i.e. we were outside of
1584 * the varlink_dispatch_method() stack frame), which means with this reply we are ready to
1585 * process further messages. */
1586 v
->current
= json_variant_unref(v
->current
);
1587 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1589 /* We replied to a method call from within the varlink_dispatch_method() stack frame), which
1590 * means we should it handle the rest of the state engine. */
1591 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1596 int varlink_replyb(Varlink
*v
, ...) {
1597 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1601 assert_return(v
, -EINVAL
);
1604 r
= json_buildv(¶meters
, ap
);
1610 return varlink_reply(v
, parameters
);
1613 int varlink_error(Varlink
*v
, const char *error_id
, JsonVariant
*parameters
) {
1614 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1617 assert_return(v
, -EINVAL
);
1618 assert_return(error_id
, -EINVAL
);
1620 if (v
->state
== VARLINK_DISCONNECTED
)
1621 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1622 if (!IN_SET(v
->state
,
1623 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1624 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1625 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1627 r
= varlink_sanitize_parameters(¶meters
);
1629 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1631 r
= json_build(&m
, JSON_BUILD_OBJECT(
1632 JSON_BUILD_PAIR("error", JSON_BUILD_STRING(error_id
)),
1633 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1635 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1637 r
= varlink_enqueue_json(v
, m
);
1639 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1641 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1642 v
->current
= json_variant_unref(v
->current
);
1643 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1645 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1650 int varlink_errorb(Varlink
*v
, const char *error_id
, ...) {
1651 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1655 assert_return(v
, -EINVAL
);
1656 assert_return(error_id
, -EINVAL
);
1658 va_start(ap
, error_id
);
1659 r
= json_buildv(¶meters
, ap
);
1663 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1665 return varlink_error(v
, error_id
, parameters
);
1668 int varlink_error_invalid_parameter(Varlink
*v
, JsonVariant
*parameters
) {
1671 assert_return(v
, -EINVAL
);
1672 assert_return(parameters
, -EINVAL
);
1674 /* We expect to be called in one of two ways: the 'parameters' argument is a string variant in which
1675 * case it is the parameter key name that is invalid. Or the 'parameters' argument is an object
1676 * variant in which case we'll pull out the first key. The latter mode is useful in functions that
1677 * don't expect any arguments. */
1679 /* varlink_error(...) expects a json object as the third parameter. Passing a string variant causes
1680 * parameter sanitization to fail, and it returns -EINVAL. */
1682 if (json_variant_is_string(parameters
)) {
1683 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters_obj
= NULL
;
1685 r
= json_build(¶meters_obj
,
1687 JSON_BUILD_PAIR("parameter", JSON_BUILD_VARIANT(parameters
))));
1691 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
, parameters_obj
);
1694 if (json_variant_is_object(parameters
) &&
1695 json_variant_elements(parameters
) > 0) {
1696 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters_obj
= NULL
;
1698 r
= json_build(¶meters_obj
,
1700 JSON_BUILD_PAIR("parameter", JSON_BUILD_VARIANT(json_variant_by_index(parameters
, 0)))));
1704 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
, parameters_obj
);
1710 int varlink_error_errno(Varlink
*v
, int error
) {
1711 return varlink_errorb(
1713 VARLINK_ERROR_SYSTEM
,
1714 JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(abs(error
)))));
1717 int varlink_notify(Varlink
*v
, JsonVariant
*parameters
) {
1718 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1721 assert_return(v
, -EINVAL
);
1723 if (v
->state
== VARLINK_DISCONNECTED
)
1724 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1725 if (!IN_SET(v
->state
, VARLINK_PROCESSING_METHOD_MORE
, VARLINK_PENDING_METHOD_MORE
))
1726 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1728 r
= varlink_sanitize_parameters(¶meters
);
1730 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1732 r
= json_build(&m
, JSON_BUILD_OBJECT(
1733 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1734 JSON_BUILD_PAIR("continues", JSON_BUILD_BOOLEAN(true))));
1736 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1738 r
= varlink_enqueue_json(v
, m
);
1740 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1742 /* No state change, as more is coming */
1746 int varlink_notifyb(Varlink
*v
, ...) {
1747 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1751 assert_return(v
, -EINVAL
);
1754 r
= json_buildv(¶meters
, ap
);
1758 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1760 return varlink_notify(v
, parameters
);
1763 int varlink_bind_reply(Varlink
*v
, VarlinkReply callback
) {
1764 assert_return(v
, -EINVAL
);
1766 if (callback
&& v
->reply_callback
&& callback
!= v
->reply_callback
)
1767 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
1769 v
->reply_callback
= callback
;
1774 void* varlink_set_userdata(Varlink
*v
, void *userdata
) {
1777 assert_return(v
, NULL
);
1780 v
->userdata
= userdata
;
1785 void* varlink_get_userdata(Varlink
*v
) {
1786 assert_return(v
, NULL
);
1791 static int varlink_acquire_ucred(Varlink
*v
) {
1796 if (v
->ucred_acquired
)
1799 r
= getpeercred(v
->fd
, &v
->ucred
);
1803 v
->ucred_acquired
= true;
1807 int varlink_get_peer_uid(Varlink
*v
, uid_t
*ret
) {
1810 assert_return(v
, -EINVAL
);
1811 assert_return(ret
, -EINVAL
);
1813 r
= varlink_acquire_ucred(v
);
1815 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1817 if (!uid_is_valid(v
->ucred
.uid
))
1818 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1820 *ret
= v
->ucred
.uid
;
1824 int varlink_get_peer_pid(Varlink
*v
, pid_t
*ret
) {
1827 assert_return(v
, -EINVAL
);
1828 assert_return(ret
, -EINVAL
);
1830 r
= varlink_acquire_ucred(v
);
1832 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1834 if (!pid_is_valid(v
->ucred
.pid
))
1835 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1837 *ret
= v
->ucred
.pid
;
1841 int varlink_set_relative_timeout(Varlink
*v
, usec_t timeout
) {
1842 assert_return(v
, -EINVAL
);
1843 assert_return(timeout
> 0, -EINVAL
);
1845 v
->timeout
= timeout
;
1849 VarlinkServer
*varlink_get_server(Varlink
*v
) {
1850 assert_return(v
, NULL
);
1855 int varlink_set_description(Varlink
*v
, const char *description
) {
1856 assert_return(v
, -EINVAL
);
1858 return free_and_strdup(&v
->description
, description
);
1861 static int io_callback(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1862 Varlink
*v
= userdata
;
1867 handle_revents(v
, revents
);
1868 (void) varlink_process(v
);
1873 static int time_callback(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
1874 Varlink
*v
= userdata
;
1879 (void) varlink_process(v
);
1883 static int defer_callback(sd_event_source
*s
, void *userdata
) {
1884 Varlink
*v
= userdata
;
1889 (void) varlink_process(v
);
1893 static int prepare_callback(sd_event_source
*s
, void *userdata
) {
1894 Varlink
*v
= userdata
;
1902 e
= varlink_get_events(v
);
1906 r
= sd_event_source_set_io_events(v
->io_event_source
, e
);
1908 return varlink_log_errno(v
, r
, "Failed to set source events: %m");
1910 r
= varlink_get_timeout(v
, &until
);
1913 have_timeout
= r
> 0;
1916 r
= sd_event_source_set_time(v
->time_event_source
, until
);
1918 return varlink_log_errno(v
, r
, "Failed to set source time: %m");
1921 r
= sd_event_source_set_enabled(v
->time_event_source
, have_timeout
? SD_EVENT_ON
: SD_EVENT_OFF
);
1923 return varlink_log_errno(v
, r
, "Failed to enable event source: %m");
1928 static int quit_callback(sd_event_source
*event
, void *userdata
) {
1929 Varlink
*v
= userdata
;
1940 int varlink_attach_event(Varlink
*v
, sd_event
*e
, int64_t priority
) {
1943 assert_return(v
, -EINVAL
);
1944 assert_return(!v
->event
, -EBUSY
);
1947 v
->event
= sd_event_ref(e
);
1949 r
= sd_event_default(&v
->event
);
1951 return varlink_log_errno(v
, r
, "Failed to create event source: %m");
1954 r
= sd_event_add_time(v
->event
, &v
->time_event_source
, CLOCK_MONOTONIC
, 0, 0, time_callback
, v
);
1958 r
= sd_event_source_set_priority(v
->time_event_source
, priority
);
1962 (void) sd_event_source_set_description(v
->time_event_source
, "varlink-time");
1964 r
= sd_event_add_exit(v
->event
, &v
->quit_event_source
, quit_callback
, v
);
1968 r
= sd_event_source_set_priority(v
->quit_event_source
, priority
);
1972 (void) sd_event_source_set_description(v
->quit_event_source
, "varlink-quit");
1974 r
= sd_event_add_io(v
->event
, &v
->io_event_source
, v
->fd
, 0, io_callback
, v
);
1978 r
= sd_event_source_set_prepare(v
->io_event_source
, prepare_callback
);
1982 r
= sd_event_source_set_priority(v
->io_event_source
, priority
);
1986 (void) sd_event_source_set_description(v
->io_event_source
, "varlink-io");
1988 r
= sd_event_add_defer(v
->event
, &v
->defer_event_source
, defer_callback
, v
);
1992 r
= sd_event_source_set_priority(v
->defer_event_source
, priority
);
1996 (void) sd_event_source_set_description(v
->defer_event_source
, "varlink-defer");
2001 varlink_log_errno(v
, r
, "Failed to setup event source: %m");
2002 varlink_detach_event(v
);
2006 void varlink_detach_event(Varlink
*v
) {
2010 varlink_detach_event_sources(v
);
2012 v
->event
= sd_event_unref(v
->event
);
2015 sd_event
*varlink_get_event(Varlink
*v
) {
2016 assert_return(v
, NULL
);
2021 int varlink_server_new(VarlinkServer
**ret
, VarlinkServerFlags flags
) {
2024 assert_return(ret
, -EINVAL
);
2025 assert_return((flags
& ~_VARLINK_SERVER_FLAGS_ALL
) == 0, -EINVAL
);
2027 s
= new(VarlinkServer
, 1);
2029 return log_oom_debug();
2031 *s
= (VarlinkServer
) {
2034 .connections_max
= varlink_server_connections_max(NULL
),
2035 .connections_per_uid_max
= varlink_server_connections_per_uid_max(NULL
),
2042 static VarlinkServer
* varlink_server_destroy(VarlinkServer
*s
) {
2048 varlink_server_shutdown(s
);
2050 while ((m
= hashmap_steal_first_key(s
->methods
)))
2053 hashmap_free(s
->methods
);
2054 hashmap_free(s
->by_uid
);
2056 sd_event_unref(s
->event
);
2058 free(s
->description
);
2063 DEFINE_TRIVIAL_REF_UNREF_FUNC(VarlinkServer
, varlink_server
, varlink_server_destroy
);
2065 static int validate_connection(VarlinkServer
*server
, const struct ucred
*ucred
) {
2071 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ROOT_ONLY
))
2072 allowed
= ucred
->uid
== 0;
2074 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_MYSELF_ONLY
))
2075 allowed
= allowed
> 0 || ucred
->uid
== getuid();
2077 if (allowed
== 0) { /* Allow access when it is explicitly allowed or when neither
2078 * VARLINK_SERVER_ROOT_ONLY nor VARLINK_SERVER_MYSELF_ONLY are specified. */
2079 varlink_server_log(server
, "Unprivileged client attempted connection, refusing.");
2083 if (server
->n_connections
>= server
->connections_max
) {
2084 varlink_server_log(server
, "Connection limit of %u reached, refusing.", server
->connections_max
);
2088 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2091 if (!uid_is_valid(ucred
->uid
)) {
2092 varlink_server_log(server
, "Client with invalid UID attempted connection, refusing.");
2096 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2097 if (c
>= server
->connections_per_uid_max
) {
2098 varlink_server_log(server
, "Per-UID connection limit of %u reached, refusing.",
2099 server
->connections_per_uid_max
);
2107 static int count_connection(VarlinkServer
*server
, const struct ucred
*ucred
) {
2114 server
->n_connections
++;
2116 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2117 r
= hashmap_ensure_allocated(&server
->by_uid
, NULL
);
2119 return log_debug_errno(r
, "Failed to allocate UID hash table: %m");
2121 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2123 varlink_server_log(server
, "Connections of user " UID_FMT
": %u (of %u max)",
2124 ucred
->uid
, c
, server
->connections_per_uid_max
);
2126 r
= hashmap_replace(server
->by_uid
, UID_TO_PTR(ucred
->uid
), UINT_TO_PTR(c
+ 1));
2128 return log_debug_errno(r
, "Failed to increment counter in UID hash table: %m");
2134 int varlink_server_add_connection(VarlinkServer
*server
, int fd
, Varlink
**ret
) {
2135 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
2136 struct ucred ucred
= UCRED_INVALID
;
2137 bool ucred_acquired
;
2140 assert_return(server
, -EINVAL
);
2141 assert_return(fd
>= 0, -EBADF
);
2143 if ((server
->flags
& (VARLINK_SERVER_ROOT_ONLY
|VARLINK_SERVER_ACCOUNT_UID
)) != 0) {
2144 r
= getpeercred(fd
, &ucred
);
2146 return varlink_server_log_errno(server
, r
, "Failed to acquire peer credentials of incoming socket, refusing: %m");
2148 ucred_acquired
= true;
2150 r
= validate_connection(server
, &ucred
);
2156 ucred_acquired
= false;
2158 r
= varlink_new(&v
);
2160 return varlink_server_log_errno(server
, r
, "Failed to allocate connection object: %m");
2162 r
= count_connection(server
, &ucred
);
2167 if (server
->flags
& VARLINK_SERVER_INHERIT_USERDATA
)
2168 v
->userdata
= server
->userdata
;
2170 if (ucred_acquired
) {
2172 v
->ucred_acquired
= true;
2175 _cleanup_free_
char *desc
= NULL
;
2176 if (asprintf(&desc
, "%s-%i", server
->description
?: "varlink", v
->fd
) >= 0)
2177 v
->description
= TAKE_PTR(desc
);
2179 /* Link up the server and the connection, and take reference in both directions. Note that the
2180 * reference on the connection is left dangling. It will be dropped when the connection is closed,
2181 * which happens in varlink_close(), including in the event loop quit callback. */
2182 v
->server
= varlink_server_ref(server
);
2185 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
2187 if (server
->event
) {
2188 r
= varlink_attach_event(v
, server
->event
, server
->event_priority
);
2190 varlink_log_errno(v
, r
, "Failed to attach new connection: %m");
2191 v
->fd
= -1; /* take the fd out of the connection again */
2203 static int connect_callback(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2204 VarlinkServerSocket
*ss
= userdata
;
2205 _cleanup_close_
int cfd
= -1;
2212 varlink_server_log(ss
->server
, "New incoming connection.");
2214 cfd
= accept4(fd
, NULL
, NULL
, SOCK_NONBLOCK
|SOCK_CLOEXEC
);
2216 if (ERRNO_IS_ACCEPT_AGAIN(errno
))
2219 return varlink_server_log_errno(ss
->server
, errno
, "Failed to accept incoming socket: %m");
2222 r
= varlink_server_add_connection(ss
->server
, cfd
, &v
);
2228 if (ss
->server
->connect_callback
) {
2229 r
= ss
->server
->connect_callback(ss
->server
, v
, ss
->server
->userdata
);
2231 varlink_log_errno(v
, r
, "Connection callback returned error, disconnecting client: %m");
2240 int varlink_server_listen_fd(VarlinkServer
*s
, int fd
) {
2241 _cleanup_free_ VarlinkServerSocket
*ss
= NULL
;
2244 assert_return(s
, -EINVAL
);
2245 assert_return(fd
>= 0, -EBADF
);
2247 r
= fd_nonblock(fd
, true);
2251 ss
= new(VarlinkServerSocket
, 1);
2253 return log_oom_debug();
2255 *ss
= (VarlinkServerSocket
) {
2261 r
= sd_event_add_io(s
->event
, &ss
->event_source
, fd
, EPOLLIN
, connect_callback
, ss
);
2265 r
= sd_event_source_set_priority(ss
->event_source
, s
->event_priority
);
2270 LIST_PREPEND(sockets
, s
->sockets
, TAKE_PTR(ss
));
2274 int varlink_server_listen_address(VarlinkServer
*s
, const char *address
, mode_t m
) {
2275 union sockaddr_union sockaddr
;
2276 socklen_t sockaddr_len
;
2277 _cleanup_close_
int fd
= -1;
2280 assert_return(s
, -EINVAL
);
2281 assert_return(address
, -EINVAL
);
2282 assert_return((m
& ~0777) == 0, -EINVAL
);
2284 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
2289 fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2293 fd
= fd_move_above_stdio(fd
);
2295 (void) sockaddr_un_unlink(&sockaddr
.un
);
2297 RUN_WITH_UMASK(~m
& 0777) {
2298 r
= mac_selinux_bind(fd
, &sockaddr
.sa
, sockaddr_len
);
2303 if (listen(fd
, SOMAXCONN
) < 0)
2306 r
= varlink_server_listen_fd(s
, fd
);
2314 void* varlink_server_set_userdata(VarlinkServer
*s
, void *userdata
) {
2317 assert_return(s
, NULL
);
2320 s
->userdata
= userdata
;
2325 void* varlink_server_get_userdata(VarlinkServer
*s
) {
2326 assert_return(s
, NULL
);
2331 static VarlinkServerSocket
* varlink_server_socket_destroy(VarlinkServerSocket
*ss
) {
2336 LIST_REMOVE(sockets
, ss
->server
->sockets
, ss
);
2338 sd_event_source_disable_unref(ss
->event_source
);
2346 int varlink_server_shutdown(VarlinkServer
*s
) {
2347 assert_return(s
, -EINVAL
);
2350 varlink_server_socket_destroy(s
->sockets
);
2355 int varlink_server_attach_event(VarlinkServer
*s
, sd_event
*e
, int64_t priority
) {
2358 assert_return(s
, -EINVAL
);
2359 assert_return(!s
->event
, -EBUSY
);
2362 s
->event
= sd_event_ref(e
);
2364 r
= sd_event_default(&s
->event
);
2369 LIST_FOREACH(sockets
, ss
, s
->sockets
) {
2370 assert(!ss
->event_source
);
2372 r
= sd_event_add_io(s
->event
, &ss
->event_source
, ss
->fd
, EPOLLIN
, connect_callback
, ss
);
2376 r
= sd_event_source_set_priority(ss
->event_source
, priority
);
2381 s
->event_priority
= priority
;
2385 varlink_server_detach_event(s
);
2389 int varlink_server_detach_event(VarlinkServer
*s
) {
2390 assert_return(s
, -EINVAL
);
2392 LIST_FOREACH(sockets
, ss
, s
->sockets
)
2393 ss
->event_source
= sd_event_source_disable_unref(ss
->event_source
);
2395 sd_event_unref(s
->event
);
2399 sd_event
*varlink_server_get_event(VarlinkServer
*s
) {
2400 assert_return(s
, NULL
);
2405 int varlink_server_bind_method(VarlinkServer
*s
, const char *method
, VarlinkMethod callback
) {
2406 _cleanup_free_
char *m
= NULL
;
2409 assert_return(s
, -EINVAL
);
2410 assert_return(method
, -EINVAL
);
2411 assert_return(callback
, -EINVAL
);
2413 if (startswith(method
, "org.varlink.service."))
2414 return log_debug_errno(SYNTHETIC_ERRNO(EEXIST
), "Cannot bind server to '%s'.", method
);
2418 return log_oom_debug();
2420 r
= hashmap_ensure_put(&s
->methods
, &string_hash_ops
, m
, callback
);
2422 return log_oom_debug();
2424 return log_debug_errno(r
, "Failed to register callback: %m");
2431 int varlink_server_bind_method_many_internal(VarlinkServer
*s
, ...) {
2435 assert_return(s
, -EINVAL
);
2439 VarlinkMethod callback
;
2442 method
= va_arg(ap
, const char *);
2446 callback
= va_arg(ap
, VarlinkMethod
);
2448 r
= varlink_server_bind_method(s
, method
, callback
);
2457 int varlink_server_bind_connect(VarlinkServer
*s
, VarlinkConnect callback
) {
2458 assert_return(s
, -EINVAL
);
2460 if (callback
&& s
->connect_callback
&& callback
!= s
->connect_callback
)
2461 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2463 s
->connect_callback
= callback
;
2467 int varlink_server_bind_disconnect(VarlinkServer
*s
, VarlinkDisconnect callback
) {
2468 assert_return(s
, -EINVAL
);
2470 if (callback
&& s
->disconnect_callback
&& callback
!= s
->disconnect_callback
)
2471 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2473 s
->disconnect_callback
= callback
;
2477 unsigned varlink_server_connections_max(VarlinkServer
*s
) {
2480 /* If a server is specified, return the setting for that server, otherwise the default value */
2482 return s
->connections_max
;
2484 dts
= getdtablesize();
2487 /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */
2488 if (VARLINK_DEFAULT_CONNECTIONS_MAX
> (unsigned) dts
/ 4 * 3)
2491 return VARLINK_DEFAULT_CONNECTIONS_MAX
;
2494 unsigned varlink_server_connections_per_uid_max(VarlinkServer
*s
) {
2498 return s
->connections_per_uid_max
;
2500 /* Make sure to never use up more than ¾th of available connections for a single user */
2501 m
= varlink_server_connections_max(NULL
);
2502 if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
> m
)
2505 return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
;
2508 int varlink_server_set_connections_per_uid_max(VarlinkServer
*s
, unsigned m
) {
2509 assert_return(s
, -EINVAL
);
2510 assert_return(m
> 0, -EINVAL
);
2512 s
->connections_per_uid_max
= m
;
2516 int varlink_server_set_connections_max(VarlinkServer
*s
, unsigned m
) {
2517 assert_return(s
, -EINVAL
);
2518 assert_return(m
> 0, -EINVAL
);
2520 s
->connections_max
= m
;
2524 unsigned varlink_server_current_connections(VarlinkServer
*s
) {
2525 assert_return(s
, UINT_MAX
);
2527 return s
->n_connections
;
2530 int varlink_server_set_description(VarlinkServer
*s
, const char *description
) {
2531 assert_return(s
, -EINVAL
);
2533 return free_and_strdup(&s
->description
, description
);