1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
6 #include "alloc-util.h"
7 #include "errno-util.h"
9 #include "glyph-util.h"
13 #include "process-util.h"
14 #include "selinux-util.h"
16 #include "socket-util.h"
17 #include "string-table.h"
18 #include "string-util.h"
20 #include "time-util.h"
21 #include "umask-util.h"
22 #include "user-util.h"
25 #define VARLINK_DEFAULT_CONNECTIONS_MAX 4096U
26 #define VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX 1024U
28 #define VARLINK_DEFAULT_TIMEOUT_USEC (45U*USEC_PER_SEC)
29 #define VARLINK_BUFFER_MAX (16U*1024U*1024U)
30 #define VARLINK_READ_SIZE (64U*1024U)
32 typedef enum VarlinkState
{
33 /* Client side states */
35 VARLINK_AWAITING_REPLY
,
36 VARLINK_AWAITING_REPLY_MORE
,
39 VARLINK_PROCESSING_REPLY
,
41 /* Server side states */
43 VARLINK_PROCESSING_METHOD
,
44 VARLINK_PROCESSING_METHOD_MORE
,
45 VARLINK_PROCESSING_METHOD_ONEWAY
,
46 VARLINK_PROCESSED_METHOD
,
47 VARLINK_PENDING_METHOD
,
48 VARLINK_PENDING_METHOD_MORE
,
50 /* Common states (only during shutdown) */
51 VARLINK_PENDING_DISCONNECT
,
52 VARLINK_PENDING_TIMEOUT
,
53 VARLINK_PROCESSING_DISCONNECT
,
54 VARLINK_PROCESSING_TIMEOUT
,
55 VARLINK_PROCESSING_FAILURE
,
59 _VARLINK_STATE_INVALID
= -EINVAL
,
62 /* Tests whether we are not yet disconnected. Note that this is true during all states where the connection
63 * is still good for something, and false only when it's dead for good. This means: when we are
64 * asynchronously connecting to a peer and the connect() is still pending, then this will return 'true', as
65 * the connection is still good, and we are likely to be able to properly operate on it soon. */
66 #define VARLINK_STATE_IS_ALIVE(state) \
68 VARLINK_IDLE_CLIENT, \
69 VARLINK_AWAITING_REPLY, \
70 VARLINK_AWAITING_REPLY_MORE, \
73 VARLINK_PROCESSING_REPLY, \
74 VARLINK_IDLE_SERVER, \
75 VARLINK_PROCESSING_METHOD, \
76 VARLINK_PROCESSING_METHOD_MORE, \
77 VARLINK_PROCESSING_METHOD_ONEWAY, \
78 VARLINK_PROCESSED_METHOD, \
79 VARLINK_PENDING_METHOD, \
80 VARLINK_PENDING_METHOD_MORE)
85 VarlinkServer
*server
;
88 bool connecting
; /* This boolean indicates whether the socket fd we are operating on is currently
89 * processing an asynchronous connect(). In that state we watch the socket for
90 * EPOLLOUT, but we refrain from calling read() or write() on the socket as that
91 * will trigger ENOTCONN. Note that this boolean is kept separate from the
92 * VarlinkState above on purpose: while the connect() is still not complete we
93 * already want to allow queuing of messages and similar. Thus it's nice to keep
94 * these two state concepts separate: the VarlinkState encodes what our own view of
95 * the connection is, i.e. whether we think it's a server, a client, and has
96 * something queued already, while 'connecting' tells us a detail about the
97 * transport used below, that should have no effect on how we otherwise accept and
98 * process operations from the user.
100 * Or to say this differently: VARLINK_STATE_IS_ALIVE(state) tells you whether the
101 * connection is good to use, even if it might not be fully connected
102 * yet. connecting=true then informs you that actually we are still connecting, and
103 * the connection is actually not established yet and thus any requests you enqueue
104 * now will still work fine but will be queued only, not sent yet, but that
105 * shouldn't stop you from using the connection, since eventually whatever you queue
108 * Or to say this even differently: 'state' is a high-level ("application layer"
109 * high, if you so will) state, while 'conecting' is a low-level ("transport layer"
110 * low, if you so will) state, and while they are not entirely unrelated and
111 * sometimes propagate effects to each other they are only asynchronously connected
117 char *input_buffer
; /* valid data starts at input_buffer_index, ends at input_buffer_index+input_buffer_size */
118 size_t input_buffer_index
;
119 size_t input_buffer_size
;
120 size_t input_buffer_unscanned
;
122 char *output_buffer
; /* valid data starts at output_buffer_index, ends at output_buffer_index+output_buffer_size */
123 size_t output_buffer_index
;
124 size_t output_buffer_size
;
126 VarlinkReply reply_callback
;
128 JsonVariant
*current
;
132 bool ucred_acquired
:1;
134 bool write_disconnected
:1;
135 bool read_disconnected
:1;
136 bool prefer_read_write
:1;
146 sd_event_source
*io_event_source
;
147 sd_event_source
*time_event_source
;
148 sd_event_source
*quit_event_source
;
149 sd_event_source
*defer_event_source
;
152 typedef struct VarlinkServerSocket VarlinkServerSocket
;
154 struct VarlinkServerSocket
{
155 VarlinkServer
*server
;
160 sd_event_source
*event_source
;
162 LIST_FIELDS(VarlinkServerSocket
, sockets
);
165 struct VarlinkServer
{
167 VarlinkServerFlags flags
;
169 LIST_HEAD(VarlinkServerSocket
, sockets
);
172 VarlinkConnect connect_callback
;
173 VarlinkDisconnect disconnect_callback
;
176 int64_t event_priority
;
178 unsigned n_connections
;
184 unsigned connections_max
;
185 unsigned connections_per_uid_max
;
188 static const char* const varlink_state_table
[_VARLINK_STATE_MAX
] = {
189 [VARLINK_IDLE_CLIENT
] = "idle-client",
190 [VARLINK_AWAITING_REPLY
] = "awaiting-reply",
191 [VARLINK_AWAITING_REPLY_MORE
] = "awaiting-reply-more",
192 [VARLINK_CALLING
] = "calling",
193 [VARLINK_CALLED
] = "called",
194 [VARLINK_PROCESSING_REPLY
] = "processing-reply",
195 [VARLINK_IDLE_SERVER
] = "idle-server",
196 [VARLINK_PROCESSING_METHOD
] = "processing-method",
197 [VARLINK_PROCESSING_METHOD_MORE
] = "processing-method-more",
198 [VARLINK_PROCESSING_METHOD_ONEWAY
] = "processing-method-oneway",
199 [VARLINK_PROCESSED_METHOD
] = "processed-method",
200 [VARLINK_PENDING_METHOD
] = "pending-method",
201 [VARLINK_PENDING_METHOD_MORE
] = "pending-method-more",
202 [VARLINK_PENDING_DISCONNECT
] = "pending-disconnect",
203 [VARLINK_PENDING_TIMEOUT
] = "pending-timeout",
204 [VARLINK_PROCESSING_DISCONNECT
] = "processing-disconnect",
205 [VARLINK_PROCESSING_TIMEOUT
] = "processing-timeout",
206 [VARLINK_PROCESSING_FAILURE
] = "processing-failure",
207 [VARLINK_DISCONNECTED
] = "disconnected",
210 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(varlink_state
, VarlinkState
);
212 #define varlink_log_errno(v, error, fmt, ...) \
213 log_debug_errno(error, "%s: " fmt, varlink_description(v), ##__VA_ARGS__)
215 #define varlink_log(v, fmt, ...) \
216 log_debug("%s: " fmt, varlink_description(v), ##__VA_ARGS__)
218 #define varlink_server_log_errno(s, error, fmt, ...) \
219 log_debug_errno(error, "%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
221 #define varlink_server_log(s, fmt, ...) \
222 log_debug("%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
224 static inline const char *varlink_description(Varlink
*v
) {
225 return (v
? v
->description
: NULL
) ?: "varlink";
228 static inline const char *varlink_server_description(VarlinkServer
*s
) {
229 return (s
? s
->description
: NULL
) ?: "varlink";
232 static void varlink_set_state(Varlink
*v
, VarlinkState state
) {
234 assert(state
>= 0 && state
< _VARLINK_STATE_MAX
);
237 varlink_log(v
, "Setting state %s",
238 varlink_state_to_string(state
));
240 varlink_log(v
, "Changing state %s %s %s",
241 varlink_state_to_string(v
->state
),
242 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT
),
243 varlink_state_to_string(state
));
248 static int varlink_new(Varlink
**ret
) {
261 .state
= _VARLINK_STATE_INVALID
,
263 .ucred
= UCRED_INVALID
,
265 .timestamp
= USEC_INFINITY
,
266 .timeout
= VARLINK_DEFAULT_TIMEOUT_USEC
273 int varlink_connect_address(Varlink
**ret
, const char *address
) {
274 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
275 union sockaddr_union sockaddr
;
278 assert_return(ret
, -EINVAL
);
279 assert_return(address
, -EINVAL
);
283 return log_debug_errno(r
, "Failed to create varlink object: %m");
285 v
->fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
287 return log_debug_errno(errno
, "Failed to create AF_UNIX socket: %m");
289 v
->fd
= fd_move_above_stdio(v
->fd
);
291 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
293 if (r
!= -ENAMETOOLONG
)
294 return log_debug_errno(r
, "Failed to set socket address '%s': %m", address
);
296 /* This is a file system path, and too long to fit into sockaddr_un. Let's connect via O_PATH
299 r
= connect_unix_path(v
->fd
, AT_FDCWD
, address
);
301 r
= RET_NERRNO(connect(v
->fd
, &sockaddr
.sa
, r
));
304 if (!IN_SET(r
, -EAGAIN
, -EINPROGRESS
))
305 return log_debug_errno(r
, "Failed to connect to %s: %m", address
);
307 v
->connecting
= true; /* We are asynchronously connecting, i.e. the connect() is being
308 * processed in the background. As long as that's the case the socket
309 * is in a special state: it's there, we can poll it for EPOLLOUT, but
310 * if we attempt to write() to it before we see EPOLLOUT we'll get
311 * ENOTCONN (and not EAGAIN, like we would for a normal connected
312 * socket that isn't writable at the moment). Since ENOTCONN on write()
313 * hence can mean two different things (i.e. connection not complete
314 * yet vs. already disconnected again), we store as a boolean whether
315 * we are still in connect(). */
318 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
324 int varlink_connect_fd(Varlink
**ret
, int fd
) {
328 assert_return(ret
, -EINVAL
);
329 assert_return(fd
>= 0, -EBADF
);
331 r
= fd_nonblock(fd
, true);
333 return log_debug_errno(r
, "Failed to make fd %d nonblocking: %m", fd
);
337 return log_debug_errno(r
, "Failed to create varlink object: %m");
340 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
342 /* Note that if this function is called we assume the passed socket (if it is one) is already
343 * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that
344 * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket
345 * until the connection is fully set up. Behaviour here is hence a bit different from
346 * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and
347 * avoid doing write() on it before we saw EPOLLOUT for the first time. */
353 static void varlink_detach_event_sources(Varlink
*v
) {
356 v
->io_event_source
= sd_event_source_disable_unref(v
->io_event_source
);
357 v
->time_event_source
= sd_event_source_disable_unref(v
->time_event_source
);
358 v
->quit_event_source
= sd_event_source_disable_unref(v
->quit_event_source
);
359 v
->defer_event_source
= sd_event_source_disable_unref(v
->defer_event_source
);
362 static void varlink_clear(Varlink
*v
) {
365 varlink_detach_event_sources(v
);
367 v
->fd
= safe_close(v
->fd
);
369 v
->input_buffer
= mfree(v
->input_buffer
);
370 v
->output_buffer
= mfree(v
->output_buffer
);
372 v
->current
= json_variant_unref(v
->current
);
373 v
->reply
= json_variant_unref(v
->reply
);
375 v
->event
= sd_event_unref(v
->event
);
378 static Varlink
* varlink_destroy(Varlink
*v
) {
382 /* If this is called the server object must already been unreffed here. Why that? because when we
383 * linked up the varlink connection with the server object we took one ref in each direction */
388 free(v
->description
);
392 DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink
, varlink
, varlink_destroy
);
394 static int varlink_test_disconnect(Varlink
*v
) {
397 /* Tests whether we the connection has been terminated. We are careful to not stop processing it
398 * prematurely, since we want to handle half-open connections as well as possible and want to flush
399 * out and read data before we close down if we can. */
401 /* Already disconnected? */
402 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
405 /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */
409 /* Still something to write and we can write? Stay around */
410 if (v
->output_buffer_size
> 0 && !v
->write_disconnected
)
413 /* Both sides gone already? Then there's no need to stick around */
414 if (v
->read_disconnected
&& v
->write_disconnected
)
417 /* If we are waiting for incoming data but the read side is shut down, disconnect. */
418 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) && v
->read_disconnected
)
421 /* Similar, if are a client that hasn't written anything yet but the write side is dead, also
422 * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side
423 * being down if we never wrote anything. */
424 if (IN_SET(v
->state
, VARLINK_IDLE_CLIENT
) && (v
->write_disconnected
|| v
->got_pollhup
))
427 /* We are on the server side and still want to send out more replies, but we saw POLLHUP already, and
428 * either got no buffered bytes to write anymore or already saw a write error. In that case we should
429 * shut down the varlink link. */
430 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
) && (v
->write_disconnected
|| v
->output_buffer_size
== 0) && v
->got_pollhup
)
436 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
440 static int varlink_write(Varlink
*v
) {
445 if (!VARLINK_STATE_IS_ALIVE(v
->state
))
447 if (v
->connecting
) /* Writing while we are still wait for a non-blocking connect() to complete will
448 * result in ENOTCONN, hence exit early here */
450 if (v
->output_buffer_size
== 0)
452 if (v
->write_disconnected
)
457 /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible
458 * with non-socket IO, hence fall back automatically.
460 * Use a local variable to help gcc figure out that we set 'n' in all cases. */
461 bool prefer_write
= v
->prefer_read_write
;
463 n
= send(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
, MSG_DONTWAIT
|MSG_NOSIGNAL
);
464 if (n
< 0 && errno
== ENOTSOCK
)
465 prefer_write
= v
->prefer_read_write
= true;
468 n
= write(v
->fd
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
);
473 if (ERRNO_IS_DISCONNECT(errno
)) {
474 /* If we get informed about a disconnect on write, then let's remember that, but not
475 * act on it just yet. Let's wait for read() to report the issue first. */
476 v
->write_disconnected
= true;
483 v
->output_buffer_size
-= n
;
485 if (v
->output_buffer_size
== 0)
486 v
->output_buffer_index
= 0;
488 v
->output_buffer_index
+= n
;
490 v
->timestamp
= now(CLOCK_MONOTONIC
);
494 static int varlink_read(Varlink
*v
) {
500 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
))
502 if (v
->connecting
) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */
506 if (v
->input_buffer_unscanned
> 0)
508 if (v
->read_disconnected
)
511 if (v
->input_buffer_size
>= VARLINK_BUFFER_MAX
)
516 if (MALLOC_SIZEOF_SAFE(v
->input_buffer
) <= v
->input_buffer_index
+ v
->input_buffer_size
) {
519 add
= MIN(VARLINK_BUFFER_MAX
- v
->input_buffer_size
, VARLINK_READ_SIZE
);
521 if (v
->input_buffer_index
== 0) {
523 if (!GREEDY_REALLOC(v
->input_buffer
, v
->input_buffer_size
+ add
))
529 b
= new(char, v
->input_buffer_size
+ add
);
533 memcpy(b
, v
->input_buffer
+ v
->input_buffer_index
, v
->input_buffer_size
);
535 free_and_replace(v
->input_buffer
, b
);
536 v
->input_buffer_index
= 0;
540 rs
= MALLOC_SIZEOF_SAFE(v
->input_buffer
) - (v
->input_buffer_index
+ v
->input_buffer_size
);
542 bool prefer_read
= v
->prefer_read_write
;
544 n
= recv(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
, MSG_DONTWAIT
);
545 if (n
< 0 && errno
== ENOTSOCK
)
546 prefer_read
= v
->prefer_read_write
= true;
549 n
= read(v
->fd
, v
->input_buffer
+ v
->input_buffer_index
+ v
->input_buffer_size
, rs
);
554 if (ERRNO_IS_DISCONNECT(errno
)) {
555 v
->read_disconnected
= true;
561 if (n
== 0) { /* EOF */
562 v
->read_disconnected
= true;
566 v
->input_buffer_size
+= n
;
567 v
->input_buffer_unscanned
+= n
;
572 static int varlink_parse_message(Varlink
*v
) {
573 const char *e
, *begin
;
581 if (v
->input_buffer_unscanned
<= 0)
584 assert(v
->input_buffer_unscanned
<= v
->input_buffer_size
);
585 assert(v
->input_buffer_index
+ v
->input_buffer_size
<= MALLOC_SIZEOF_SAFE(v
->input_buffer
));
587 begin
= v
->input_buffer
+ v
->input_buffer_index
;
589 e
= memchr(begin
+ v
->input_buffer_size
- v
->input_buffer_unscanned
, 0, v
->input_buffer_unscanned
);
591 v
->input_buffer_unscanned
= 0;
597 varlink_log(v
, "New incoming message: %s", begin
); /* FIXME: should we output the whole message here before validation?
598 * This may produce a non-printable journal entry if the message
599 * is invalid. We may also expose privileged information. */
601 r
= json_parse(begin
, 0, &v
->current
, NULL
, NULL
);
603 /* If we encounter a parse failure flush all data. We cannot possibly recover from this,
604 * hence drop all buffered data now. */
605 v
->input_buffer_index
= v
->input_buffer_size
= v
->input_buffer_unscanned
= 0;
606 return varlink_log_errno(v
, r
, "Failed to parse JSON: %m");
609 v
->input_buffer_size
-= sz
;
611 if (v
->input_buffer_size
== 0)
612 v
->input_buffer_index
= 0;
614 v
->input_buffer_index
+= sz
;
616 v
->input_buffer_unscanned
= v
->input_buffer_size
;
620 static int varlink_test_timeout(Varlink
*v
) {
623 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
625 if (v
->timeout
== USEC_INFINITY
)
628 if (now(CLOCK_MONOTONIC
) < usec_add(v
->timestamp
, v
->timeout
))
631 varlink_set_state(v
, VARLINK_PENDING_TIMEOUT
);
636 static int varlink_dispatch_local_error(Varlink
*v
, const char *error
) {
642 if (!v
->reply_callback
)
645 r
= v
->reply_callback(v
, NULL
, error
, VARLINK_REPLY_ERROR
|VARLINK_REPLY_LOCAL
, v
->userdata
);
647 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
652 static int varlink_dispatch_timeout(Varlink
*v
) {
655 if (v
->state
!= VARLINK_PENDING_TIMEOUT
)
658 varlink_set_state(v
, VARLINK_PROCESSING_TIMEOUT
);
659 varlink_dispatch_local_error(v
, VARLINK_ERROR_TIMEOUT
);
665 static int varlink_dispatch_disconnect(Varlink
*v
) {
668 if (v
->state
!= VARLINK_PENDING_DISCONNECT
)
671 varlink_set_state(v
, VARLINK_PROCESSING_DISCONNECT
);
672 varlink_dispatch_local_error(v
, VARLINK_ERROR_DISCONNECTED
);
678 static int varlink_sanitize_parameters(JsonVariant
**v
) {
681 /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */
683 return json_variant_new_object(v
, NULL
, 0);
684 else if (!json_variant_is_object(*v
))
690 static int varlink_dispatch_reply(Varlink
*v
) {
691 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
692 VarlinkReplyFlags flags
= 0;
693 const char *error
= NULL
;
700 if (!IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
))
705 assert(v
->n_pending
> 0);
707 if (!json_variant_is_object(v
->current
))
710 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
712 if (streq(k
, "error")) {
715 if (!json_variant_is_string(e
))
718 error
= json_variant_string(e
);
719 flags
|= VARLINK_REPLY_ERROR
;
721 } else if (streq(k
, "parameters")) {
724 if (!json_variant_is_object(e
))
727 parameters
= json_variant_ref(e
);
729 } else if (streq(k
, "continues")) {
730 if (FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
733 if (!json_variant_is_boolean(e
))
736 if (json_variant_boolean(e
))
737 flags
|= VARLINK_REPLY_CONTINUES
;
742 /* Replies with 'continue' set are only OK if we set 'more' when the method call was initiated */
743 if (v
->state
!= VARLINK_AWAITING_REPLY_MORE
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
746 /* An error is final */
747 if (error
&& FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
750 r
= varlink_sanitize_parameters(¶meters
);
754 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
)) {
755 varlink_set_state(v
, VARLINK_PROCESSING_REPLY
);
757 if (v
->reply_callback
) {
758 r
= v
->reply_callback(v
, parameters
, error
, flags
, v
->userdata
);
760 log_debug_errno(r
, "Reply callback returned error, ignoring: %m");
763 v
->current
= json_variant_unref(v
->current
);
765 if (v
->state
== VARLINK_PROCESSING_REPLY
) {
767 assert(v
->n_pending
> 0);
769 if (!FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
))
773 FLAGS_SET(flags
, VARLINK_REPLY_CONTINUES
) ? VARLINK_AWAITING_REPLY_MORE
:
774 v
->n_pending
== 0 ? VARLINK_IDLE_CLIENT
: VARLINK_AWAITING_REPLY
);
777 assert(v
->state
== VARLINK_CALLING
);
778 varlink_set_state(v
, VARLINK_CALLED
);
784 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
785 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
791 static int varlink_dispatch_method(Varlink
*v
) {
792 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
793 VarlinkMethodFlags flags
= 0;
794 const char *method
= NULL
, *error
;
796 VarlinkMethod callback
;
802 if (v
->state
!= VARLINK_IDLE_SERVER
)
807 if (!json_variant_is_object(v
->current
))
810 JSON_VARIANT_OBJECT_FOREACH(k
, e
, v
->current
) {
812 if (streq(k
, "method")) {
815 if (!json_variant_is_string(e
))
818 method
= json_variant_string(e
);
820 } else if (streq(k
, "parameters")) {
823 if (!json_variant_is_object(e
))
826 parameters
= json_variant_ref(e
);
828 } else if (streq(k
, "oneway")) {
830 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
833 if (!json_variant_is_boolean(e
))
836 if (json_variant_boolean(e
))
837 flags
|= VARLINK_METHOD_ONEWAY
;
839 } else if (streq(k
, "more")) {
841 if ((flags
& (VARLINK_METHOD_ONEWAY
|VARLINK_METHOD_MORE
)) != 0)
844 if (!json_variant_is_boolean(e
))
847 if (json_variant_boolean(e
))
848 flags
|= VARLINK_METHOD_MORE
;
857 r
= varlink_sanitize_parameters(¶meters
);
861 varlink_set_state(v
, (flags
& VARLINK_METHOD_MORE
) ? VARLINK_PROCESSING_METHOD_MORE
:
862 (flags
& VARLINK_METHOD_ONEWAY
) ? VARLINK_PROCESSING_METHOD_ONEWAY
:
863 VARLINK_PROCESSING_METHOD
);
867 if (STR_IN_SET(method
, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) {
868 /* For now, we don't implement a single of varlink's own methods */
870 error
= VARLINK_ERROR_METHOD_NOT_IMPLEMENTED
;
871 } else if (startswith(method
, "org.varlink.service.")) {
873 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
875 callback
= hashmap_get(v
->server
->methods
, method
);
876 error
= VARLINK_ERROR_METHOD_NOT_FOUND
;
880 r
= callback(v
, parameters
, flags
, v
->userdata
);
882 log_debug_errno(r
, "Callback for %s returned error: %m", method
);
884 /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */
885 if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
886 r
= varlink_error_errno(v
, r
);
891 } else if (!FLAGS_SET(flags
, VARLINK_METHOD_ONEWAY
)) {
894 r
= varlink_errorb(v
, error
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
))));
901 case VARLINK_PROCESSED_METHOD
: /* Method call is fully processed */
902 case VARLINK_PROCESSING_METHOD_ONEWAY
: /* ditto */
903 v
->current
= json_variant_unref(v
->current
);
904 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
907 case VARLINK_PROCESSING_METHOD
: /* Method call wasn't replied to, will be replied to later */
908 varlink_set_state(v
, VARLINK_PENDING_METHOD
);
911 case VARLINK_PROCESSING_METHOD_MORE
: /* No reply for a "more" message was sent, more to come */
912 varlink_set_state(v
, VARLINK_PENDING_METHOD_MORE
);
916 assert_not_reached();
926 varlink_set_state(v
, VARLINK_PROCESSING_FAILURE
);
927 varlink_dispatch_local_error(v
, VARLINK_ERROR_PROTOCOL
);
933 int varlink_process(Varlink
*v
) {
936 assert_return(v
, -EINVAL
);
938 if (v
->state
== VARLINK_DISCONNECTED
)
939 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
943 r
= varlink_write(v
);
945 varlink_log_errno(v
, r
, "Write failed: %m");
949 r
= varlink_dispatch_reply(v
);
951 varlink_log_errno(v
, r
, "Reply dispatch failed: %m");
955 r
= varlink_dispatch_method(v
);
957 varlink_log_errno(v
, r
, "Method dispatch failed: %m");
961 r
= varlink_parse_message(v
);
963 varlink_log_errno(v
, r
, "Message parsing failed: %m");
969 varlink_log_errno(v
, r
, "Read failed: %m");
973 r
= varlink_test_disconnect(v
);
978 r
= varlink_dispatch_disconnect(v
);
983 r
= varlink_test_timeout(v
);
988 r
= varlink_dispatch_timeout(v
);
994 if (r
>= 0 && v
->defer_event_source
) {
997 /* If we did some processing, make sure we are called again soon */
998 q
= sd_event_source_set_enabled(v
->defer_event_source
, r
> 0 ? SD_EVENT_ON
: SD_EVENT_OFF
);
1000 r
= varlink_log_errno(v
, q
, "Failed to enable deferred event source: %m");
1004 if (VARLINK_STATE_IS_ALIVE(v
->state
))
1005 /* Initiate disconnection */
1006 varlink_set_state(v
, VARLINK_PENDING_DISCONNECT
);
1008 /* We failed while disconnecting, in that case close right away */
1016 static void handle_revents(Varlink
*v
, int revents
) {
1019 if (v
->connecting
) {
1020 /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect()
1021 * to complete on, we know we are ready. We don't read the connection error here though,
1022 * we'll get the error on the next read() or write(). */
1023 if ((revents
& (POLLOUT
|POLLHUP
)) == 0)
1026 varlink_log(v
, "Anynchronous connection completed.");
1027 v
->connecting
= false;
1029 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
1030 * what we can. However, we do care about POLLHUP to detect connection termination even if we
1031 * momentarily don't want to read nor write anything. */
1033 if (!FLAGS_SET(revents
, POLLHUP
))
1036 varlink_log(v
, "Got POLLHUP from socket.");
1037 v
->got_pollhup
= true;
1041 int varlink_wait(Varlink
*v
, usec_t timeout
) {
1045 assert_return(v
, -EINVAL
);
1047 if (v
->state
== VARLINK_DISCONNECTED
)
1048 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1050 r
= varlink_get_timeout(v
, &t
);
1053 if (t
!= USEC_INFINITY
) {
1056 n
= now(CLOCK_MONOTONIC
);
1060 t
= usec_sub_unsigned(t
, n
);
1063 if (timeout
!= USEC_INFINITY
&&
1064 (t
== USEC_INFINITY
|| timeout
< t
))
1067 fd
= varlink_get_fd(v
);
1071 events
= varlink_get_events(v
);
1075 r
= fd_wait_for_event(fd
, events
, t
);
1079 handle_revents(v
, r
);
1083 int varlink_get_fd(Varlink
*v
) {
1085 assert_return(v
, -EINVAL
);
1087 if (v
->state
== VARLINK_DISCONNECTED
)
1088 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1090 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBADF
), "No valid fd.");
1095 int varlink_get_events(Varlink
*v
) {
1098 assert_return(v
, -EINVAL
);
1100 if (v
->state
== VARLINK_DISCONNECTED
)
1101 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1103 if (v
->connecting
) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which
1104 * tells us that the connection is now complete. Before that we should neither
1105 * write() or read() from the fd. */
1108 if (!v
->read_disconnected
&&
1109 IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
, VARLINK_IDLE_SERVER
) &&
1111 v
->input_buffer_unscanned
<= 0)
1114 if (!v
->write_disconnected
&&
1115 v
->output_buffer_size
> 0)
1121 int varlink_get_timeout(Varlink
*v
, usec_t
*ret
) {
1122 assert_return(v
, -EINVAL
);
1124 if (v
->state
== VARLINK_DISCONNECTED
)
1125 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1127 if (IN_SET(v
->state
, VARLINK_AWAITING_REPLY
, VARLINK_AWAITING_REPLY_MORE
, VARLINK_CALLING
) &&
1128 v
->timeout
!= USEC_INFINITY
) {
1130 *ret
= usec_add(v
->timestamp
, v
->timeout
);
1134 *ret
= USEC_INFINITY
;
1139 int varlink_flush(Varlink
*v
) {
1142 assert_return(v
, -EINVAL
);
1144 if (v
->state
== VARLINK_DISCONNECTED
)
1145 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1148 if (v
->output_buffer_size
== 0)
1150 if (v
->write_disconnected
)
1153 r
= varlink_write(v
);
1161 r
= fd_wait_for_event(v
->fd
, POLLOUT
, USEC_INFINITY
);
1163 return varlink_log_errno(v
, r
, "Poll failed on fd: %m");
1167 handle_revents(v
, r
);
1173 static void varlink_detach_server(Varlink
*v
) {
1174 VarlinkServer
*saved_server
;
1180 if (v
->server
->by_uid
&&
1181 v
->ucred_acquired
&&
1182 uid_is_valid(v
->ucred
.uid
)) {
1185 c
= PTR_TO_UINT(hashmap_get(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
)));
1189 (void) hashmap_remove(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
));
1191 (void) hashmap_replace(v
->server
->by_uid
, UID_TO_PTR(v
->ucred
.uid
), UINT_TO_PTR(c
- 1));
1194 assert(v
->server
->n_connections
> 0);
1195 v
->server
->n_connections
--;
1197 /* If this is a connection associated to a server, then let's disconnect the server and the
1198 * connection from each other. This drops the dangling reference that connect_callback() set up. But
1199 * before we release the references, let's call the disconnection callback if it is defined. */
1201 saved_server
= TAKE_PTR(v
->server
);
1203 if (saved_server
->disconnect_callback
)
1204 saved_server
->disconnect_callback(saved_server
, v
, saved_server
->userdata
);
1206 varlink_server_unref(saved_server
);
1210 int varlink_close(Varlink
*v
) {
1211 assert_return(v
, -EINVAL
);
1213 if (v
->state
== VARLINK_DISCONNECTED
)
1216 varlink_set_state(v
, VARLINK_DISCONNECTED
);
1218 /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref
1219 * which would destroy us before we can call varlink_clear() */
1221 varlink_detach_server(v
);
1228 Varlink
* varlink_close_unref(Varlink
*v
) {
1232 (void) varlink_close(v
);
1233 return varlink_unref(v
);
1236 Varlink
* varlink_flush_close_unref(Varlink
*v
) {
1240 (void) varlink_flush(v
);
1241 return varlink_close_unref(v
);
1244 static int varlink_enqueue_json(Varlink
*v
, JsonVariant
*m
) {
1245 _cleanup_free_
char *text
= NULL
;
1251 r
= json_variant_format(m
, 0, &text
);
1254 assert(text
[r
] == '\0');
1256 if (v
->output_buffer_size
+ r
+ 1 > VARLINK_BUFFER_MAX
)
1259 varlink_log(v
, "Sending message: %s", text
);
1261 if (v
->output_buffer_size
== 0) {
1263 free_and_replace(v
->output_buffer
, text
);
1265 v
->output_buffer_size
= r
+ 1;
1266 v
->output_buffer_index
= 0;
1268 } else if (v
->output_buffer_index
== 0) {
1270 if (!GREEDY_REALLOC(v
->output_buffer
, v
->output_buffer_size
+ r
+ 1))
1273 memcpy(v
->output_buffer
+ v
->output_buffer_size
, text
, r
+ 1);
1274 v
->output_buffer_size
+= r
+ 1;
1278 const size_t new_size
= v
->output_buffer_size
+ r
+ 1;
1280 n
= new(char, new_size
);
1284 memcpy(mempcpy(n
, v
->output_buffer
+ v
->output_buffer_index
, v
->output_buffer_size
), text
, r
+ 1);
1286 free_and_replace(v
->output_buffer
, n
);
1287 v
->output_buffer_size
= new_size
;
1288 v
->output_buffer_index
= 0;
1294 int varlink_send(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1295 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1298 assert_return(v
, -EINVAL
);
1299 assert_return(method
, -EINVAL
);
1301 if (v
->state
== VARLINK_DISCONNECTED
)
1302 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1304 /* We allow enqueuing multiple method calls at once! */
1305 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1306 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1308 r
= varlink_sanitize_parameters(¶meters
);
1310 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1312 r
= json_build(&m
, JSON_BUILD_OBJECT(
1313 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1314 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1315 JSON_BUILD_PAIR("oneway", JSON_BUILD_BOOLEAN(true))));
1317 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1319 r
= varlink_enqueue_json(v
, m
);
1321 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1323 /* No state change here, this is one-way only after all */
1324 v
->timestamp
= now(CLOCK_MONOTONIC
);
1328 int varlink_sendb(Varlink
*v
, const char *method
, ...) {
1329 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1333 assert_return(v
, -EINVAL
);
1335 va_start(ap
, method
);
1336 r
= json_buildv(¶meters
, ap
);
1340 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1342 return varlink_send(v
, method
, parameters
);
1345 int varlink_invoke(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1346 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1349 assert_return(v
, -EINVAL
);
1350 assert_return(method
, -EINVAL
);
1352 if (v
->state
== VARLINK_DISCONNECTED
)
1353 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1355 /* We allow enqueuing multiple method calls at once! */
1356 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
, VARLINK_AWAITING_REPLY
))
1357 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1359 r
= varlink_sanitize_parameters(¶meters
);
1361 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1363 r
= json_build(&m
, JSON_BUILD_OBJECT(
1364 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1365 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1367 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1369 r
= varlink_enqueue_json(v
, m
);
1371 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1373 varlink_set_state(v
, VARLINK_AWAITING_REPLY
);
1375 v
->timestamp
= now(CLOCK_MONOTONIC
);
1380 int varlink_invokeb(Varlink
*v
, const char *method
, ...) {
1381 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1385 assert_return(v
, -EINVAL
);
1387 va_start(ap
, method
);
1388 r
= json_buildv(¶meters
, ap
);
1392 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1394 return varlink_invoke(v
, method
, parameters
);
1397 int varlink_observe(Varlink
*v
, const char *method
, JsonVariant
*parameters
) {
1398 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1401 assert_return(v
, -EINVAL
);
1402 assert_return(method
, -EINVAL
);
1404 if (v
->state
== VARLINK_DISCONNECTED
)
1405 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1407 /* Note that we don't allow enqueuing multiple method calls when we are in more/continues mode! We
1408 * thus insist on an idle client here. */
1409 if (v
->state
!= VARLINK_IDLE_CLIENT
)
1410 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1412 r
= varlink_sanitize_parameters(¶meters
);
1414 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1416 r
= json_build(&m
, JSON_BUILD_OBJECT(
1417 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1418 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1419 JSON_BUILD_PAIR("more", JSON_BUILD_BOOLEAN(true))));
1421 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1423 r
= varlink_enqueue_json(v
, m
);
1425 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1427 varlink_set_state(v
, VARLINK_AWAITING_REPLY_MORE
);
1429 v
->timestamp
= now(CLOCK_MONOTONIC
);
1434 int varlink_observeb(Varlink
*v
, const char *method
, ...) {
1435 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1439 assert_return(v
, -EINVAL
);
1441 va_start(ap
, method
);
1442 r
= json_buildv(¶meters
, ap
);
1446 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1448 return varlink_observe(v
, method
, parameters
);
1454 JsonVariant
*parameters
,
1455 JsonVariant
**ret_parameters
,
1456 const char **ret_error_id
,
1457 VarlinkReplyFlags
*ret_flags
) {
1459 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1462 assert_return(v
, -EINVAL
);
1463 assert_return(method
, -EINVAL
);
1465 if (v
->state
== VARLINK_DISCONNECTED
)
1466 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1467 if (!IN_SET(v
->state
, VARLINK_IDLE_CLIENT
))
1468 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1470 assert(v
->n_pending
== 0); /* n_pending can't be > 0 if we are in VARLINK_IDLE_CLIENT state */
1472 r
= varlink_sanitize_parameters(¶meters
);
1474 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1476 r
= json_build(&m
, JSON_BUILD_OBJECT(
1477 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method
)),
1478 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1480 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1482 r
= varlink_enqueue_json(v
, m
);
1484 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1486 varlink_set_state(v
, VARLINK_CALLING
);
1488 v
->timestamp
= now(CLOCK_MONOTONIC
);
1490 while (v
->state
== VARLINK_CALLING
) {
1492 r
= varlink_process(v
);
1498 r
= varlink_wait(v
, USEC_INFINITY
);
1505 case VARLINK_CALLED
:
1508 json_variant_unref(v
->reply
);
1509 v
->reply
= TAKE_PTR(v
->current
);
1511 varlink_set_state(v
, VARLINK_IDLE_CLIENT
);
1512 assert(v
->n_pending
== 1);
1516 *ret_parameters
= json_variant_by_key(v
->reply
, "parameters");
1518 *ret_error_id
= json_variant_string(json_variant_by_key(v
->reply
, "error"));
1524 case VARLINK_PENDING_DISCONNECT
:
1525 case VARLINK_DISCONNECTED
:
1526 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ECONNRESET
), "Connection was closed.");
1528 case VARLINK_PENDING_TIMEOUT
:
1529 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ETIME
), "Connection timed out.");
1532 assert_not_reached();
1539 JsonVariant
**ret_parameters
,
1540 const char **ret_error_id
,
1541 VarlinkReplyFlags
*ret_flags
, ...) {
1543 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1547 assert_return(v
, -EINVAL
);
1549 va_start(ap
, ret_flags
);
1550 r
= json_buildv(¶meters
, ap
);
1554 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1556 return varlink_call(v
, method
, parameters
, ret_parameters
, ret_error_id
, ret_flags
);
1559 int varlink_reply(Varlink
*v
, JsonVariant
*parameters
) {
1560 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1563 assert_return(v
, -EINVAL
);
1565 if (v
->state
== VARLINK_DISCONNECTED
)
1567 if (!IN_SET(v
->state
,
1568 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1569 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1572 r
= varlink_sanitize_parameters(¶meters
);
1574 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1576 r
= json_build(&m
, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1578 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1580 r
= varlink_enqueue_json(v
, m
);
1582 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1584 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1585 /* We just replied to a method call that was let hanging for a while (i.e. we were outside of
1586 * the varlink_dispatch_method() stack frame), which means with this reply we are ready to
1587 * process further messages. */
1588 v
->current
= json_variant_unref(v
->current
);
1589 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1591 /* We replied to a method call from within the varlink_dispatch_method() stack frame), which
1592 * means we should it handle the rest of the state engine. */
1593 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1598 int varlink_replyb(Varlink
*v
, ...) {
1599 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1603 assert_return(v
, -EINVAL
);
1606 r
= json_buildv(¶meters
, ap
);
1612 return varlink_reply(v
, parameters
);
1615 int varlink_error(Varlink
*v
, const char *error_id
, JsonVariant
*parameters
) {
1616 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1619 assert_return(v
, -EINVAL
);
1620 assert_return(error_id
, -EINVAL
);
1622 if (v
->state
== VARLINK_DISCONNECTED
)
1623 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1624 if (!IN_SET(v
->state
,
1625 VARLINK_PROCESSING_METHOD
, VARLINK_PROCESSING_METHOD_MORE
,
1626 VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
))
1627 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1629 r
= varlink_sanitize_parameters(¶meters
);
1631 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1633 r
= json_build(&m
, JSON_BUILD_OBJECT(
1634 JSON_BUILD_PAIR("error", JSON_BUILD_STRING(error_id
)),
1635 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
))));
1637 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1639 r
= varlink_enqueue_json(v
, m
);
1641 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1643 if (IN_SET(v
->state
, VARLINK_PENDING_METHOD
, VARLINK_PENDING_METHOD_MORE
)) {
1644 v
->current
= json_variant_unref(v
->current
);
1645 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
1647 varlink_set_state(v
, VARLINK_PROCESSED_METHOD
);
1652 int varlink_errorb(Varlink
*v
, const char *error_id
, ...) {
1653 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1657 assert_return(v
, -EINVAL
);
1658 assert_return(error_id
, -EINVAL
);
1660 va_start(ap
, error_id
);
1661 r
= json_buildv(¶meters
, ap
);
1665 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1667 return varlink_error(v
, error_id
, parameters
);
1670 int varlink_error_invalid_parameter(Varlink
*v
, JsonVariant
*parameters
) {
1673 assert_return(v
, -EINVAL
);
1674 assert_return(parameters
, -EINVAL
);
1676 /* We expect to be called in one of two ways: the 'parameters' argument is a string variant in which
1677 * case it is the parameter key name that is invalid. Or the 'parameters' argument is an object
1678 * variant in which case we'll pull out the first key. The latter mode is useful in functions that
1679 * don't expect any arguments. */
1681 /* varlink_error(...) expects a json object as the third parameter. Passing a string variant causes
1682 * parameter sanitization to fail, and it returns -EINVAL. */
1684 if (json_variant_is_string(parameters
)) {
1685 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters_obj
= NULL
;
1687 r
= json_build(¶meters_obj
,
1689 JSON_BUILD_PAIR("parameter", JSON_BUILD_VARIANT(parameters
))));
1693 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
, parameters_obj
);
1696 if (json_variant_is_object(parameters
) &&
1697 json_variant_elements(parameters
) > 0) {
1698 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters_obj
= NULL
;
1700 r
= json_build(¶meters_obj
,
1702 JSON_BUILD_PAIR("parameter", JSON_BUILD_VARIANT(json_variant_by_index(parameters
, 0)))));
1706 return varlink_error(v
, VARLINK_ERROR_INVALID_PARAMETER
, parameters_obj
);
1712 int varlink_error_errno(Varlink
*v
, int error
) {
1713 return varlink_errorb(
1715 VARLINK_ERROR_SYSTEM
,
1716 JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(abs(error
)))));
1719 int varlink_notify(Varlink
*v
, JsonVariant
*parameters
) {
1720 _cleanup_(json_variant_unrefp
) JsonVariant
*m
= NULL
;
1723 assert_return(v
, -EINVAL
);
1725 if (v
->state
== VARLINK_DISCONNECTED
)
1726 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENOTCONN
), "Not connected.");
1727 if (!IN_SET(v
->state
, VARLINK_PROCESSING_METHOD_MORE
, VARLINK_PENDING_METHOD_MORE
))
1728 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "Connection busy.");
1730 r
= varlink_sanitize_parameters(¶meters
);
1732 return varlink_log_errno(v
, r
, "Failed to sanitize parameters: %m");
1734 r
= json_build(&m
, JSON_BUILD_OBJECT(
1735 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters
)),
1736 JSON_BUILD_PAIR("continues", JSON_BUILD_BOOLEAN(true))));
1738 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1740 r
= varlink_enqueue_json(v
, m
);
1742 return varlink_log_errno(v
, r
, "Failed to enqueue json message: %m");
1744 /* No state change, as more is coming */
1748 int varlink_notifyb(Varlink
*v
, ...) {
1749 _cleanup_(json_variant_unrefp
) JsonVariant
*parameters
= NULL
;
1753 assert_return(v
, -EINVAL
);
1756 r
= json_buildv(¶meters
, ap
);
1760 return varlink_log_errno(v
, r
, "Failed to build json message: %m");
1762 return varlink_notify(v
, parameters
);
1765 int varlink_bind_reply(Varlink
*v
, VarlinkReply callback
) {
1766 assert_return(v
, -EINVAL
);
1768 if (callback
&& v
->reply_callback
&& callback
!= v
->reply_callback
)
1769 return varlink_log_errno(v
, SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
1771 v
->reply_callback
= callback
;
1776 void* varlink_set_userdata(Varlink
*v
, void *userdata
) {
1779 assert_return(v
, NULL
);
1782 v
->userdata
= userdata
;
1787 void* varlink_get_userdata(Varlink
*v
) {
1788 assert_return(v
, NULL
);
1793 static int varlink_acquire_ucred(Varlink
*v
) {
1798 if (v
->ucred_acquired
)
1801 r
= getpeercred(v
->fd
, &v
->ucred
);
1805 v
->ucred_acquired
= true;
1809 int varlink_get_peer_uid(Varlink
*v
, uid_t
*ret
) {
1812 assert_return(v
, -EINVAL
);
1813 assert_return(ret
, -EINVAL
);
1815 r
= varlink_acquire_ucred(v
);
1817 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1819 if (!uid_is_valid(v
->ucred
.uid
))
1820 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1822 *ret
= v
->ucred
.uid
;
1826 int varlink_get_peer_pid(Varlink
*v
, pid_t
*ret
) {
1829 assert_return(v
, -EINVAL
);
1830 assert_return(ret
, -EINVAL
);
1832 r
= varlink_acquire_ucred(v
);
1834 return varlink_log_errno(v
, r
, "Failed to acquire credentials: %m");
1836 if (!pid_is_valid(v
->ucred
.pid
))
1837 return varlink_log_errno(v
, SYNTHETIC_ERRNO(ENODATA
), "Peer uid is invalid.");
1839 *ret
= v
->ucred
.pid
;
1843 int varlink_set_relative_timeout(Varlink
*v
, usec_t timeout
) {
1844 assert_return(v
, -EINVAL
);
1845 assert_return(timeout
> 0, -EINVAL
);
1847 v
->timeout
= timeout
;
1851 VarlinkServer
*varlink_get_server(Varlink
*v
) {
1852 assert_return(v
, NULL
);
1857 int varlink_set_description(Varlink
*v
, const char *description
) {
1858 assert_return(v
, -EINVAL
);
1860 return free_and_strdup(&v
->description
, description
);
1863 static int io_callback(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1864 Varlink
*v
= ASSERT_PTR(userdata
);
1868 handle_revents(v
, revents
);
1869 (void) varlink_process(v
);
1874 static int time_callback(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
1875 Varlink
*v
= ASSERT_PTR(userdata
);
1879 (void) varlink_process(v
);
1883 static int defer_callback(sd_event_source
*s
, void *userdata
) {
1884 Varlink
*v
= ASSERT_PTR(userdata
);
1888 (void) varlink_process(v
);
1892 static int prepare_callback(sd_event_source
*s
, void *userdata
) {
1893 Varlink
*v
= ASSERT_PTR(userdata
);
1900 e
= varlink_get_events(v
);
1904 r
= sd_event_source_set_io_events(v
->io_event_source
, e
);
1906 return varlink_log_errno(v
, r
, "Failed to set source events: %m");
1908 r
= varlink_get_timeout(v
, &until
);
1911 have_timeout
= r
> 0;
1914 r
= sd_event_source_set_time(v
->time_event_source
, until
);
1916 return varlink_log_errno(v
, r
, "Failed to set source time: %m");
1919 r
= sd_event_source_set_enabled(v
->time_event_source
, have_timeout
? SD_EVENT_ON
: SD_EVENT_OFF
);
1921 return varlink_log_errno(v
, r
, "Failed to enable event source: %m");
1926 static int quit_callback(sd_event_source
*event
, void *userdata
) {
1927 Varlink
*v
= ASSERT_PTR(userdata
);
1937 int varlink_attach_event(Varlink
*v
, sd_event
*e
, int64_t priority
) {
1940 assert_return(v
, -EINVAL
);
1941 assert_return(!v
->event
, -EBUSY
);
1944 v
->event
= sd_event_ref(e
);
1946 r
= sd_event_default(&v
->event
);
1948 return varlink_log_errno(v
, r
, "Failed to create event source: %m");
1951 r
= sd_event_add_time(v
->event
, &v
->time_event_source
, CLOCK_MONOTONIC
, 0, 0, time_callback
, v
);
1955 r
= sd_event_source_set_priority(v
->time_event_source
, priority
);
1959 (void) sd_event_source_set_description(v
->time_event_source
, "varlink-time");
1961 r
= sd_event_add_exit(v
->event
, &v
->quit_event_source
, quit_callback
, v
);
1965 r
= sd_event_source_set_priority(v
->quit_event_source
, priority
);
1969 (void) sd_event_source_set_description(v
->quit_event_source
, "varlink-quit");
1971 r
= sd_event_add_io(v
->event
, &v
->io_event_source
, v
->fd
, 0, io_callback
, v
);
1975 r
= sd_event_source_set_prepare(v
->io_event_source
, prepare_callback
);
1979 r
= sd_event_source_set_priority(v
->io_event_source
, priority
);
1983 (void) sd_event_source_set_description(v
->io_event_source
, "varlink-io");
1985 r
= sd_event_add_defer(v
->event
, &v
->defer_event_source
, defer_callback
, v
);
1989 r
= sd_event_source_set_priority(v
->defer_event_source
, priority
);
1993 (void) sd_event_source_set_description(v
->defer_event_source
, "varlink-defer");
1998 varlink_log_errno(v
, r
, "Failed to setup event source: %m");
1999 varlink_detach_event(v
);
2003 void varlink_detach_event(Varlink
*v
) {
2007 varlink_detach_event_sources(v
);
2009 v
->event
= sd_event_unref(v
->event
);
2012 sd_event
*varlink_get_event(Varlink
*v
) {
2013 assert_return(v
, NULL
);
2018 int varlink_server_new(VarlinkServer
**ret
, VarlinkServerFlags flags
) {
2021 assert_return(ret
, -EINVAL
);
2022 assert_return((flags
& ~_VARLINK_SERVER_FLAGS_ALL
) == 0, -EINVAL
);
2024 s
= new(VarlinkServer
, 1);
2026 return log_oom_debug();
2028 *s
= (VarlinkServer
) {
2031 .connections_max
= varlink_server_connections_max(NULL
),
2032 .connections_per_uid_max
= varlink_server_connections_per_uid_max(NULL
),
2039 static VarlinkServer
* varlink_server_destroy(VarlinkServer
*s
) {
2045 varlink_server_shutdown(s
);
2047 while ((m
= hashmap_steal_first_key(s
->methods
)))
2050 hashmap_free(s
->methods
);
2051 hashmap_free(s
->by_uid
);
2053 sd_event_unref(s
->event
);
2055 free(s
->description
);
2060 DEFINE_TRIVIAL_REF_UNREF_FUNC(VarlinkServer
, varlink_server
, varlink_server_destroy
);
2062 static int validate_connection(VarlinkServer
*server
, const struct ucred
*ucred
) {
2068 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ROOT_ONLY
))
2069 allowed
= ucred
->uid
== 0;
2071 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_MYSELF_ONLY
))
2072 allowed
= allowed
> 0 || ucred
->uid
== getuid();
2074 if (allowed
== 0) { /* Allow access when it is explicitly allowed or when neither
2075 * VARLINK_SERVER_ROOT_ONLY nor VARLINK_SERVER_MYSELF_ONLY are specified. */
2076 varlink_server_log(server
, "Unprivileged client attempted connection, refusing.");
2080 if (server
->n_connections
>= server
->connections_max
) {
2081 varlink_server_log(server
, "Connection limit of %u reached, refusing.", server
->connections_max
);
2085 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2088 if (!uid_is_valid(ucred
->uid
)) {
2089 varlink_server_log(server
, "Client with invalid UID attempted connection, refusing.");
2093 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2094 if (c
>= server
->connections_per_uid_max
) {
2095 varlink_server_log(server
, "Per-UID connection limit of %u reached, refusing.",
2096 server
->connections_per_uid_max
);
2104 static int count_connection(VarlinkServer
*server
, const struct ucred
*ucred
) {
2111 server
->n_connections
++;
2113 if (FLAGS_SET(server
->flags
, VARLINK_SERVER_ACCOUNT_UID
)) {
2114 r
= hashmap_ensure_allocated(&server
->by_uid
, NULL
);
2116 return log_debug_errno(r
, "Failed to allocate UID hash table: %m");
2118 c
= PTR_TO_UINT(hashmap_get(server
->by_uid
, UID_TO_PTR(ucred
->uid
)));
2120 varlink_server_log(server
, "Connections of user " UID_FMT
": %u (of %u max)",
2121 ucred
->uid
, c
, server
->connections_per_uid_max
);
2123 r
= hashmap_replace(server
->by_uid
, UID_TO_PTR(ucred
->uid
), UINT_TO_PTR(c
+ 1));
2125 return log_debug_errno(r
, "Failed to increment counter in UID hash table: %m");
2131 int varlink_server_add_connection(VarlinkServer
*server
, int fd
, Varlink
**ret
) {
2132 _cleanup_(varlink_unrefp
) Varlink
*v
= NULL
;
2133 struct ucred ucred
= UCRED_INVALID
;
2134 bool ucred_acquired
;
2137 assert_return(server
, -EINVAL
);
2138 assert_return(fd
>= 0, -EBADF
);
2140 if ((server
->flags
& (VARLINK_SERVER_ROOT_ONLY
|VARLINK_SERVER_ACCOUNT_UID
)) != 0) {
2141 r
= getpeercred(fd
, &ucred
);
2143 return varlink_server_log_errno(server
, r
, "Failed to acquire peer credentials of incoming socket, refusing: %m");
2145 ucred_acquired
= true;
2147 r
= validate_connection(server
, &ucred
);
2153 ucred_acquired
= false;
2155 r
= varlink_new(&v
);
2157 return varlink_server_log_errno(server
, r
, "Failed to allocate connection object: %m");
2159 r
= count_connection(server
, &ucred
);
2164 if (server
->flags
& VARLINK_SERVER_INHERIT_USERDATA
)
2165 v
->userdata
= server
->userdata
;
2167 if (ucred_acquired
) {
2169 v
->ucred_acquired
= true;
2172 _cleanup_free_
char *desc
= NULL
;
2173 if (asprintf(&desc
, "%s-%i", server
->description
?: "varlink", v
->fd
) >= 0)
2174 v
->description
= TAKE_PTR(desc
);
2176 /* Link up the server and the connection, and take reference in both directions. Note that the
2177 * reference on the connection is left dangling. It will be dropped when the connection is closed,
2178 * which happens in varlink_close(), including in the event loop quit callback. */
2179 v
->server
= varlink_server_ref(server
);
2182 varlink_set_state(v
, VARLINK_IDLE_SERVER
);
2184 if (server
->event
) {
2185 r
= varlink_attach_event(v
, server
->event
, server
->event_priority
);
2187 varlink_log_errno(v
, r
, "Failed to attach new connection: %m");
2188 v
->fd
= -1; /* take the fd out of the connection again */
2200 static int connect_callback(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2201 VarlinkServerSocket
*ss
= ASSERT_PTR(userdata
);
2202 _cleanup_close_
int cfd
= -1;
2208 varlink_server_log(ss
->server
, "New incoming connection.");
2210 cfd
= accept4(fd
, NULL
, NULL
, SOCK_NONBLOCK
|SOCK_CLOEXEC
);
2212 if (ERRNO_IS_ACCEPT_AGAIN(errno
))
2215 return varlink_server_log_errno(ss
->server
, errno
, "Failed to accept incoming socket: %m");
2218 r
= varlink_server_add_connection(ss
->server
, cfd
, &v
);
2224 if (ss
->server
->connect_callback
) {
2225 r
= ss
->server
->connect_callback(ss
->server
, v
, ss
->server
->userdata
);
2227 varlink_log_errno(v
, r
, "Connection callback returned error, disconnecting client: %m");
2236 int varlink_server_listen_fd(VarlinkServer
*s
, int fd
) {
2237 _cleanup_free_ VarlinkServerSocket
*ss
= NULL
;
2240 assert_return(s
, -EINVAL
);
2241 assert_return(fd
>= 0, -EBADF
);
2243 r
= fd_nonblock(fd
, true);
2247 ss
= new(VarlinkServerSocket
, 1);
2249 return log_oom_debug();
2251 *ss
= (VarlinkServerSocket
) {
2257 r
= sd_event_add_io(s
->event
, &ss
->event_source
, fd
, EPOLLIN
, connect_callback
, ss
);
2261 r
= sd_event_source_set_priority(ss
->event_source
, s
->event_priority
);
2266 LIST_PREPEND(sockets
, s
->sockets
, TAKE_PTR(ss
));
2270 int varlink_server_listen_address(VarlinkServer
*s
, const char *address
, mode_t m
) {
2271 union sockaddr_union sockaddr
;
2272 socklen_t sockaddr_len
;
2273 _cleanup_close_
int fd
= -1;
2276 assert_return(s
, -EINVAL
);
2277 assert_return(address
, -EINVAL
);
2278 assert_return((m
& ~0777) == 0, -EINVAL
);
2280 r
= sockaddr_un_set_path(&sockaddr
.un
, address
);
2285 fd
= socket(AF_UNIX
, SOCK_STREAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2289 fd
= fd_move_above_stdio(fd
);
2291 (void) sockaddr_un_unlink(&sockaddr
.un
);
2293 RUN_WITH_UMASK(~m
& 0777) {
2294 r
= mac_selinux_bind(fd
, &sockaddr
.sa
, sockaddr_len
);
2299 if (listen(fd
, SOMAXCONN
) < 0)
2302 r
= varlink_server_listen_fd(s
, fd
);
2310 void* varlink_server_set_userdata(VarlinkServer
*s
, void *userdata
) {
2313 assert_return(s
, NULL
);
2316 s
->userdata
= userdata
;
2321 void* varlink_server_get_userdata(VarlinkServer
*s
) {
2322 assert_return(s
, NULL
);
2327 static VarlinkServerSocket
* varlink_server_socket_destroy(VarlinkServerSocket
*ss
) {
2332 LIST_REMOVE(sockets
, ss
->server
->sockets
, ss
);
2334 sd_event_source_disable_unref(ss
->event_source
);
2342 int varlink_server_shutdown(VarlinkServer
*s
) {
2343 assert_return(s
, -EINVAL
);
2346 varlink_server_socket_destroy(s
->sockets
);
2351 int varlink_server_attach_event(VarlinkServer
*s
, sd_event
*e
, int64_t priority
) {
2354 assert_return(s
, -EINVAL
);
2355 assert_return(!s
->event
, -EBUSY
);
2358 s
->event
= sd_event_ref(e
);
2360 r
= sd_event_default(&s
->event
);
2365 LIST_FOREACH(sockets
, ss
, s
->sockets
) {
2366 assert(!ss
->event_source
);
2368 r
= sd_event_add_io(s
->event
, &ss
->event_source
, ss
->fd
, EPOLLIN
, connect_callback
, ss
);
2372 r
= sd_event_source_set_priority(ss
->event_source
, priority
);
2377 s
->event_priority
= priority
;
2381 varlink_server_detach_event(s
);
2385 int varlink_server_detach_event(VarlinkServer
*s
) {
2386 assert_return(s
, -EINVAL
);
2388 LIST_FOREACH(sockets
, ss
, s
->sockets
)
2389 ss
->event_source
= sd_event_source_disable_unref(ss
->event_source
);
2391 sd_event_unref(s
->event
);
2395 sd_event
*varlink_server_get_event(VarlinkServer
*s
) {
2396 assert_return(s
, NULL
);
2401 int varlink_server_bind_method(VarlinkServer
*s
, const char *method
, VarlinkMethod callback
) {
2402 _cleanup_free_
char *m
= NULL
;
2405 assert_return(s
, -EINVAL
);
2406 assert_return(method
, -EINVAL
);
2407 assert_return(callback
, -EINVAL
);
2409 if (startswith(method
, "org.varlink.service."))
2410 return log_debug_errno(SYNTHETIC_ERRNO(EEXIST
), "Cannot bind server to '%s'.", method
);
2414 return log_oom_debug();
2416 r
= hashmap_ensure_put(&s
->methods
, &string_hash_ops
, m
, callback
);
2418 return log_oom_debug();
2420 return log_debug_errno(r
, "Failed to register callback: %m");
2427 int varlink_server_bind_method_many_internal(VarlinkServer
*s
, ...) {
2431 assert_return(s
, -EINVAL
);
2435 VarlinkMethod callback
;
2438 method
= va_arg(ap
, const char *);
2442 callback
= va_arg(ap
, VarlinkMethod
);
2444 r
= varlink_server_bind_method(s
, method
, callback
);
2453 int varlink_server_bind_connect(VarlinkServer
*s
, VarlinkConnect callback
) {
2454 assert_return(s
, -EINVAL
);
2456 if (callback
&& s
->connect_callback
&& callback
!= s
->connect_callback
)
2457 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2459 s
->connect_callback
= callback
;
2463 int varlink_server_bind_disconnect(VarlinkServer
*s
, VarlinkDisconnect callback
) {
2464 assert_return(s
, -EINVAL
);
2466 if (callback
&& s
->disconnect_callback
&& callback
!= s
->disconnect_callback
)
2467 return log_debug_errno(SYNTHETIC_ERRNO(EBUSY
), "A different callback was already set.");
2469 s
->disconnect_callback
= callback
;
2473 unsigned varlink_server_connections_max(VarlinkServer
*s
) {
2476 /* If a server is specified, return the setting for that server, otherwise the default value */
2478 return s
->connections_max
;
2480 dts
= getdtablesize();
2483 /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */
2484 if (VARLINK_DEFAULT_CONNECTIONS_MAX
> (unsigned) dts
/ 4 * 3)
2487 return VARLINK_DEFAULT_CONNECTIONS_MAX
;
2490 unsigned varlink_server_connections_per_uid_max(VarlinkServer
*s
) {
2494 return s
->connections_per_uid_max
;
2496 /* Make sure to never use up more than ¾th of available connections for a single user */
2497 m
= varlink_server_connections_max(NULL
);
2498 if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
> m
)
2501 return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX
;
2504 int varlink_server_set_connections_per_uid_max(VarlinkServer
*s
, unsigned m
) {
2505 assert_return(s
, -EINVAL
);
2506 assert_return(m
> 0, -EINVAL
);
2508 s
->connections_per_uid_max
= m
;
2512 int varlink_server_set_connections_max(VarlinkServer
*s
, unsigned m
) {
2513 assert_return(s
, -EINVAL
);
2514 assert_return(m
> 0, -EINVAL
);
2516 s
->connections_max
= m
;
2520 unsigned varlink_server_current_connections(VarlinkServer
*s
) {
2521 assert_return(s
, UINT_MAX
);
2523 return s
->n_connections
;
2526 int varlink_server_set_description(VarlinkServer
*s
, const char *description
) {
2527 assert_return(s
, -EINVAL
);
2529 return free_and_strdup(&s
->description
, description
);